WO2025050282A1 - Swing angle limiting and braking protection mechanism, fitness chair and working method thereof - Google Patents

Abstract

A swing angle limiting and braking protection mechanism, a fitness chair and a working method thereof. The fitness chair comprises a frame body (1), a seat plate (101), a power source, and a movable mechanism. The movable mechanism comprises a leg plate portion, a linkage mechanism (6), and a leg plate connecting member (205) pivotally connected to a driving shaft (501). The leg plate portion is pivotally connected to the leg plate connecting member (205) by means of a pivot shaft and is located in front of the seat plate (101). The linkage mechanism (6) comprises a driving link (601) fixedly connected to the driving shaft (501) and used for outwards transmitting the rotation of the driving shaft (501), and a driven link (602) pivotally connected to the driving link (601) by means of a pivot pin (6015), and the driven link (602) is driven by the driving link (601) to swing. The driven link (602) is pivotally connected to the leg plate portion and drives the leg plate portion to retract, stretch and swing by taking the pivot shaft as a center, so that the leg plate portion moves from a vertical state to a horizontal state and/or from the horizontal state to the vertical state. The driving link (601) drives the driven link (602), the leg plate connecting member (205), and the leg plate portion to collaboratively stretch muscles and swing by taking the driving shaft (501) as a center, so that the driven link, the leg plate connecting member, and the leg plate portion move from horizontal positions to high positions and then from the high positions to the horizontal positions.

Description

A swing angle limiting braking protection mechanism, fitness chair and working method thereof Technical Field

The invention relates to the field of fitness equipment, and in particular to a swing angle limiting braking protection mechanism, a fitness chair and a working method thereof.

Background Art

Huangdi Neijing says: "If the tendons grow one inch, life will be extended by ten years." Stretching is a very beneficial exercise, but active stretching is a very painful exercise. Based on this, the industry has developed fitness equipment that allows users to stretch passively, so that people can easily achieve the stretching training effect with the help of electric equipment.

For example, the Chinese invention patent with patent number CN2014103126389 provides a multifunctional flexibility stretching training bed, including a bed frame and a bed board and a movable bed board arranged on the upper part of the bed frame. Inside the bed frame, a battery connected to the motor circuit is arranged at the lower part of the bed board, and the motor is connected to the reducer through a coupling. Connecting rods are arranged on both sides of the bed frame, and one end of the symmetrically arranged connecting rods is connected to the output shaft on the reducer, and the other end is connected to the leg pressing board through bolts; inside the bed frame, a push rod motor is arranged at the lower part of the movable bed board, and the end of the push rod motor is connected and fixed to the connecting rod A through bolts, and the tail is connected and fixed to the bed frame through bolts, and connecting rods B are symmetrically arranged on the connecting rod A, and the symmetrically arranged connecting rods B are respectively connected to the hip opening rod through bolts B. The present invention can enable trainees to complete waist and leg flexibility training by themselves.

However, the fitness equipment of the patent and the fitness equipment of the prior art have the following defects:

1. It is not suitable for use in small spaces and cannot enter thousands of households. In general households, the indoor space is small, and stretching equipment is required to have a folding and retracting function, that is, it can be unfolded when stretching, allowing temporary occupation of a larger space, and folded up when not in use, and used as a sofa to reduce space occupation. Only in this way can it enter thousands of households.

2. The convenience and safety of use are not good. In terms of convenience, the above-mentioned stretching equipment is not convenient to adjust, and I cannot freely set the stretching swing angle. After the stretching angle of the stretching training bed reaches people's requirements, it needs to be manually limited, and it is difficult for one person to complete the angle setting. In terms of safety, when stretching the legs, the leg bending angle is dynamic for different users and varies from person to person. When the angle is appropriate for my body, I can control the machine and confirm this angle. In the repeated leg bending cycle, personal injury should not be caused by electrical control failure or the leg bending angle is greater than the initial setting angle.

3. Do not frequently swing and stretch. If the stretching is not continuous, the stretching effect will be limited. For example, the above equipment can only move the legs to a certain angle, keep them still for a period of time, then return to the original position and then lift them again. The poor continuity leads to poor stretching effect.

Summary of the invention

The object of the present invention is to provide a swing angle limiting braking protection mechanism, a fitness chair and a working method thereof, so as to overcome the deficiencies of the above-mentioned prior art.

In order to achieve the above object, the technical solution of the present invention is:

A fitness chair, comprising:

A frame, the frame comprising a seat for a user to sit or lie on; and

A power source, fixed on the frame, having a drive shaft for outputting power; and

An active mechanism that completes the retracting and extending swing and the stretching and swinging under the drive of a power source;

The movable mechanism comprises a leg plate portion, a connecting rod mechanism, and a leg plate connecting member pivotally connected to the driving shaft;

The leg plate portion is pivotally connected to the leg plate connecting member through a pivot shaft and is located in front of the seat plate;

The connecting rod mechanism includes an active connecting rod fixedly connected to the driving shaft for transmitting the rotation of the driving shaft outward, and a driven connecting rod pivotally connected to the active connecting rod through a pivot pin, and the driven connecting rod swings under the drive of the active connecting rod;

The driven connecting rod is pivotally connected to the leg plate portion to drive the leg plate portion to retract and swing around the pivot axis, so that the leg plate portion moves from vertical to horizontal or from horizontal to vertical;

The active connecting rod drives the driven connecting rod, the leg plate connecting piece and the leg plate part to swing in coordination with the tensioning rod around the driving shaft, so that the driven connecting rod, the leg plate connecting piece and the leg plate part move from the horizontal position to the high position and then from the high position to the horizontal position, in a reciprocating cycle.

As an improvement to the above technical solution, the power source is a power motor, and the drive shaft is an output shaft of the power motor.

As an improvement to the above technical solution, the frame body includes side frames located on the left and right sides of the seat plate, the side frames are frame structures, there are two power motors, which are respectively fixed on the two side frames, the drive shaft extends horizontally from the side frames to the inside, and the leg plate connector and the active connecting rod are installed on the drive shaft and are located on the inside of the side frames.

As an improvement to the above technical solution, the leg plate portion includes a leg plate and leg plate mounting members fixed on both sides of the leg plate, and the leg plate is The leg plate mounting member is pivotally connected to the driven connecting rod.

The fitness chair of the present invention has a power source fixed on a frame (more specifically, fixed on a side frame), a seat plate arranged horizontally for users to sit or lie on, an active connecting rod fixed on a driving shaft, a leg plate connecting piece pivotally connected to the driving shaft and the leg plate portion front and back, and a driven connecting rod pivotally connected to the leg plate portion and the active connecting rod front and back, so that the leg plate connecting piece is at the same level as the seat plate when it is stationary, and the leg plate portion is naturally vertical in front of the seat plate; when the power source outputs power, the leg plate portion retracts and swings around the pivot axis as the center, and the leg plate portion opens from vertical to horizontal or retracts from horizontal to vertical; after the leg plate portion swings upward from vertical to horizontal or swings downward from horizontal to vertical, the retraction and swinging is completed. Then the fitness chair enters a stretching and swinging state, and the active connecting rod drives the driven connecting rod, the leg plate connecting piece, and the leg plate portion to swing in coordination with the stretching around the driving shaft as the center, from horizontal to high position and then from high position to horizontal, in a reciprocating cycle. The center position of the output shaft is higher than the seat plate and is located in front of the back plate, which can ensure that the swing center of the leg plate corresponds to the user's hip joint when the user stretches his legs, so as to avoid relative movement between the leg plate and the user's calf when the user moves his legs to stretch, thereby damaging the skin.

When the fitness chair is in a static state, there is no power output, the seat is horizontal, the back panel is located behind the seat and is in a vertical state, and the leg panel is located in front of the seat and is in a vertical state. At this time, the fitness chair is in a sitting state (equivalent to a single sofa) and occupies a small area.

When the power source outputs power, the driving shaft drives the active connecting rod to swing, and the active connecting rod drives the driven connecting rod to push the leg panel to retract and swing around the pivot axis until the leg panel is flush with the leg panel connector and the seat board. The fitness chair is in a bed state (equivalent to a single bed), occupying a large area. The fitness chair enters the exercise state and temporarily occupies a large area. At this time, the user can lie flat on the fitness chair.

After that, the power source continues to output power, and the driven connecting rod and the leg plate part no longer move relative to each other. The driven connecting rod, the leg plate part, and the leg plate connecting part work together under the drive of the active connecting rod, and swing up and down around the driving shaft, i.e., the leg plate part of the fitness chair swings upward from the horizontal to the set highest point, and then swings back to the horizontal from the set highest point, completing a stretching swing cycle. When swinging upward, the fitness chair drives the user's thighs and calves to move together to complete the leg stretching swing.

When the exercise is finished, that is, when the stretching and swinging are finished, the leg plate connecting piece, the leg plate part and the seat plate are at the same level, the power source continues to output, the power shaft rotates downward to drive the leg plate part to swing back from the horizontal state to the vertical state, and then the power source stops outputting power, and the fitness chair is folded to the sitting state, and the fitness chair is stationary. At this time, the fitness chair occupies a small area.

As an improvement to the above technical solution, the movable mechanism further comprises a back plate portion located behind the seat plate; the back plate portion comprises a first back plate portion or a second back plate portion,

The first back plate portion is composed of a back plate and guide plates on both sides of the lower rear portion of the back plate, the back plate portion is pivotally connected to the rear portion of the frame body through the guide plates, the guide plates are arc plates, and the layer plates have arc tracks; the rear portion of the active connecting rod is provided with an axle pin with a bearing, when the active connecting rod is retracted and swung, the active connecting rod is in sliding contact with the arc track of the guide plate through the axle pin, and when the tensioning bar is swung, the axle pin is disengaged from the guide plate;

The second back panel portion includes a back panel and back panel mounting parts located on both sides below the back panel, and the second back panel portion is pivotally connected to the driving shaft through the back panel mounting parts; a shift pin is provided at the rear of the active connecting rod; when the fitness chair is folded, extended or swung, the active connecting rod is in sliding contact with the bottom surface of the back panel mounting part through the shift pin.

As an improvement to the above technical solution, a shift groove is provided at the lower portion of the back plate mounting member; the shift pin is in high-pair contact with the top surface of the shift groove.

As an improvement to the above technical solution, a backboard support plate is horizontally arranged at the rear of the frame to provide support for the backboard portion when the backboard portion swings downward to a horizontal position.

As an improvement to the above technical solution, a limit assembly is provided between the leg board mounting member and the leg board connecting member, and the limit assembly includes:

A limit stopper is arranged at the lower inner side of the front part of the leg plate connecting member to limit the upward swing of the leg plate when the leg plate is swung to the horizontal position;

The limiting tension spring is connected between the leg plate connecting piece and the leg plate portion, and applies force to the leg plate portion and the leg plate connecting piece when limiting, so as to prevent the leg plate portion from tilting forward relative to the leg plate connecting piece when unloaded.

The first limit block is arranged at the far end of the active connecting rod, and contacts with the driven connecting rod when the leg plate part swings to the horizontal, so that the driven connecting rod, the leg plate part and the leg plate connecting member are relatively stationary;

When the first limit block contacts the lower bottom surface of the driven connecting rod, the first limit block limits the relative movement of the active connecting rod and the driven connecting rod; during the retraction and extension swing, the first limit block does not touch the driven connecting rod, and the active connecting rod applies force to the leg plate part through the driven connecting rod, so that the leg plate part changes from vertical to horizontal or from horizontal to vertical; during the tensioning swing, the first limit block touches the driven connecting rod, and the active connecting rod applies force to the driven connecting rod, the leg plate part, and the leg plate connecting piece, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece change from horizontal to high position or from high position to horizontal.

As an improvement to the above technical solution, a first limit pin is provided on the outer side of one end of the leg plate connecting member close to the leg plate connecting shaft, a second limit pin is provided on the top of the leg plate mounting member, and a limit tension spring is connected between the first limit pin and the second limit pin.

As an improvement to the above technical solution, a second limit block is provided on the inner side of the middle part of the driven connecting rod; when the leg plate is in a horizontal state, The second limit block of the moving link contacts the lower bottom surface of the leg plate connecting piece, so that the driven link no longer applies force to the leg plate alone. Instead, during the swing of the stretching rod, the active link pushes the driven link, the leg plate mounting piece, the leg plate, and the leg plate connecting piece to move in coordination and perform the stretching swing. At this time, the active link and the driven link have no mutual movement.

When the second limit block contacts the lower bottom surface of the leg plate connecting piece, the relative movement between the driven connecting rod and the leg plate connecting piece is restricted; during the retraction and extension swing, the second limit block does not contact the leg plate connecting piece, and the active connecting rod applies force to the leg plate part through the driven connecting rod, so that the leg plate part changes from vertical to horizontal or from horizontal to vertical; during the tensioning swing, the second limit block contacts the leg plate connecting piece, and the active connecting rod applies force to the driven connecting rod, the leg plate part, and the leg plate connecting piece, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece change from horizontal to high position or from high position to horizontal.

As an improvement to the above technical solution, a protective cover with an opening at the lower end is provided on the outer periphery of the driven connecting rod, and the driven connecting rod and the leg plate connecting piece are covered in the semi-enclosed structure of the protective cover.

The active connecting rod is in contact with the back plate, so that the back plate and the leg plate are only connected when they are retracted and extended, but not when the leg plate is stretched and swung.

In a static state, the active connecting rod is in contact with the back plate portion, and the active connecting rod has a supporting force for the back plate portion, so that the leg plate portion is in a vertical state in relation to the back plate portion;

During the retraction and extension swing, the active connecting rod exerts a thrust on the leg plate portion, and the leg plate portion swings from a vertical state to a horizontal state. At this time, the active connecting rod and the back plate portion tend to be disengaged, that is, the supporting force between the active connecting rod and the back plate portion disappears. Then, the back plate portion swings from a vertical state to a horizontal state under the action of gravity or other forces.

On the contrary, during the retraction and extension swing, the active connecting rod has a pulling force acting on the leg plate part, and the leg plate part swings downward from horizontal to vertical state. At this time, the active connecting rod has a thrust force acting on the back plate part, and the back plate part swings upward from horizontal to vertical state under the action of the thrust force.

During the stretching swing, the active connecting rod is disengaged from the backboard, and the active connecting rod acts on the leg board to make it swing up and down to complete the stretching exercise. At this time, the force between the active connecting rod and the backboard disappears, so that the backboard is in a horizontal state during the stretching exercise, and together with the seat board, it provides support for the trainee to lie flat. During the stretching swing, the backboard and the seat board are horizontally formed into an extended bed board, so that the trainee can lie flat during the stretching fitness exercise.

The second back plate portion is composed of a back plate and a back plate mounting member, which can be an integral component or a split member. Here, the back plate and the back plate mounting member are made into split members for the convenience of installation and maintenance.

The first back plate portion is composed of a back plate and guide plates on both sides of the lower rear portion of the back plate. Of course, it can also be an integral component or a split component like the second back plate, all for the convenience of installation and maintenance.

The fitness chair of the present invention has two kinds of movements and three states:

When the power starts to be output, the active connecting rod drives the driven connecting rod to rotate the leg plate part around the leg plate connection axis, i.e., the pivot axis, to perform retracting and swinging. The leg plate part swings upward from the vertical state in the static state to the horizontal state, and the corresponding back plate part swings downward from the vertical state to the horizontal state at the same time, and the leg plate part and the leg plate part of the fitness chair are opened to form a bed state; and when the leg plate part swings downward from the horizontal state to the vertical state in the static state, the corresponding back plate part swings upward from the horizontal state to the vertical state at the same time, and the fitness chair returns to the seat state. The leg plate part and the back plate part change from vertical to horizontal, and then from horizontal to vertical, forming a retracting and swinging action cycle.

When stretching exercise is needed, the power motor outputs power to drive the active connecting rod through the driven connecting rod, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece rotate around the driving shaft and swing upward. When the swing reaches the highest point, the reverse power output is output, and the driven connecting rod, the leg plate part, and the leg plate connecting piece rotate around the driving shaft and swing downward. Among them, the driven connecting rod, the leg plate part, and the leg plate connecting piece swing upward from the horizontal to the high point of the stretching, and then the high point of the stretching swings downward to the horizontal, forming a stretching swing action cycle.

The first state is the seat state, which is the initial state of the fitness chair. In this state, the fitness chair is stationary, no power output, and the leg plate and back plate are in a natural vertical state. This state is the state in which the fitness chair is stored after use, and is also the starting state and ending state of the fitness chair's retractable and swinging.

The second state is the bed state, in which the leg board and the back board are opened, turning from vertical to horizontal, and are in the same horizontal state as the seat board. This state is the end state of the swing from the retracted and released state to the high point, and the starting state of the muscle-stretching swing at the low point. It is the turning state of the swing from the retracted and released state to the muscle-stretching state.

The third state is the high position state of the stretching swing. In this position, the stretching swings upward to the highest point and then switches to swing downward.

As an improvement to the above technical solution, the fitness chair further comprises a walking mechanism; the walking mechanism comprises a walking traction mechanism for driving the frame to move, and a clutch mechanism for separating and engaging the walking traction mechanism and the frame;

The walking traction mechanism comprises

The driving shaft and the driven shaft are rotatably arranged under the frame, and

A driving wheel and a driven wheel are respectively arranged on the driving shaft and the driven shaft; and

Double-groove rope wheel, first pulling rope, second pulling rope, pulling spring;

The double-groove rope pulley is arranged on the driving shaft and is connected to the driving shaft through a clutch mechanism. One end of the first traction rope is wound in one of the grooves of the double-groove rope pulley, and the other end of the first traction rope passes through the guide wheel assembly arranged at the front end of the frame and is connected to the back plate; one end of the second traction rope is wound in the other groove of the double-groove rope pulley and passes through the guide wheel assembly in an opposite winding direction to the first traction rope, and the other end of the second traction rope is fixedly connected to the guide wheel assembly, one end of the traction spring is connected to the guide wheel assembly, and the other end is connected to the rear end of the frame.

The guide wheel assembly includes a front bracket fixed to the front end of the frame, a spring connecting plate hung with a pulling spring, and a spring seat plate pivotally connected to the spring connecting plate; the spring connecting plate is pivotally connected to a first guide wheel and a second guide wheel in parallel, and the front bracket is pivotally connected to a third guide wheel and a fourth guide wheel in parallel, and the fourth guide wheel is double wheels; the first pulling rope is wound around one of the fourth guide wheels and then wound in the rope groove of the double-groove rope wheel, one end of the second pulling rope is connected to the front bracket, and then wound around the second guide wheel, the third guide wheel, the first guide wheel, and the other of the fourth guide wheels and then wound in the other rope groove of the double-groove rope wheel and in the opposite direction of the pulling direction of the first pulling rope; one end of the pulling spring is hung on the spring connecting plate, and the other end is hung on the rear bracket and is fixedly connected to the rear end of the frame through the rear bracket.

When the fitness chair is not in use, it is placed in a sitting state and parked against the wall; when in use, the fitness chair moves forward and leaves the wall, making room for the back panel to change from vertical to horizontal and enter the stretching state; when the stretching is completed, the back panel changes from horizontal to vertical, and the fitness chair moves back to its initial position.

The specific action is: when placed in the seat state, the pull spring is in the stretched pre-tightened energy storage state. When the fitness chair starts and is ready to enter the stretching state, the active connecting rod rotates downward, the back plate rotates from the vertical state to the horizontal state, the energy stored in the pull spring is released, the second pull rope pulls the double groove rope wheel to rotate, the active running wheel and the driven running wheel move forward, and at the same time the first pull rope pulls the back plate to rotate downward to the horizontal position. When the back plate is transformed from the horizontal state to the vertical state, the above action is exactly the opposite. The back plate is driven by the active connecting rod to flip upward, driving the first pull rope to rotate, the first pull rope drives the double groove rope wheel to rotate, the active running wheel and the driven running wheel move backward, and the fitness chair returns to its original initial position. At the same time, the second pull rope is wound into the double groove rope wheel, and the pull spring is stretched to store energy.

The design of the above functions makes the fitness chair of the present application suitable for home use, that is, when not in use, the fitness chair is in a sitting state, can be leaned against a wall, and does not occupy a large space. When in use, the fitness chair moves forward a short distance, the backboard is laid flat, and the user can complete the stretching exercise. After the exercise is finished, the backboard is folded up, and the fitness chair moves backward a short distance at the same time, and the fitness chair is placed against the wall, freeing up indoor space.

As an improvement to the above technical solution, the clutch mechanism includes a first coupling member, a second coupling member, a reset spring, and a limit sleeve; the double-groove rope pulley is rotatably connected to the driving shaft, and a first coupling member is fixedly connected to one side of the double-groove rope pulley, and the first coupling member is rotatably sleeved on the outside of the driving shaft; a second coupling member is provided on the side of the first coupling member away from the double-groove rope pulley, and the second coupling member is sleeved on the outside of the driving shaft. The second coupling member is key-connected to the driving shaft so that the second coupling member slides along the length direction of the driving shaft, and a limit sleeve is provided on the side of the second coupling member away from the first coupling member, and the reset spring sleeve is located between the second coupling member and the limit sleeve, and the second coupling member is engaged with the first coupling member under the extrusion of the reset spring; the second coupling member is connected to the frame through a switch assembly.

As an improvement to the above technical solution, the switch assembly includes a clutch mounting frame, an eccentric wheel, a hand crank, a movable connecting rod, and a clutch sleeve; the clutch mounting frame is fixedly connected to the frame body, the eccentric wheel is rotatably connected to the clutch mounting frame and the center position of the eccentric wheel is fixedly connected to the hand crank, the middle part of the movable connecting rod is pivotally connected to the pin shaft of the clutch mounting frame, one end of the movable connecting rod is abutted against the bottom end of the eccentric wheel, and the bottom of the other end of the movable connecting rod is connected to the clutch sleeve, and the clutch sleeve is arranged on the outside of the second coupling member and pushes the second coupling member to slide in the direction of the limit sleeve.

The eccentric wheel is rotated by the hand crank to squeeze one end of the movable connecting rod, and the other end of the movable connecting rod pushes the second coupling member in the direction away from the first coupling member through the clutch sleeve, and the first coupling member and the second coupling member are in a disconnected state, that is, the power transmission between the double-groove rope pulley and the driving shaft is disconnected. At this time, people can push the stretching chair to move freely; when the double-groove rope pulley needs to be connected to the driving shaft again, it is only necessary to rotate the eccentric wheel in the opposite direction, the movable connecting rod no longer pushes the clutch sleeve, and under the action of the reset spring, the second coupling member is re-engaged with the first coupling member, thereby re-realizing the forward and backward effects of the walking traction mechanism.

The above clutch mechanism effectively realizes the two states of the fitness chair, namely, the state of moving the position and the state of stretching. When the fitness chair needs to be moved to another position indoors, the clutch device handle is turned to the separation state, so that the active running wheels are separated from the fitness chair drive system; after moving to a suitable position, when the stretching work is to be started, the clutch device handle is turned to the engagement position, and the running wheels are controlled by the fitness chair drive system, so that the front and rear movement can be realized during the stretching.

As an improvement to the above technical solution, the fitness chair also includes a safety mechanism with triple protection; the safety mechanism is a combination of a first photoelectric control mechanism and a first mechanical brake protection mechanism, or a combination of a second photoelectric control mechanism and a second mechanical brake protection mechanism.

As an improvement to the above technical solution, the first mechanical brake protection mechanism is arranged outside the power motor.

The first mechanical brake protection mechanism includes a positioning assembly fixedly arranged at the outer end of the drive shaft, a rotatable sleeve arranged at the outer end of the drive shaft, and a The positioning disc and the electric push rod are pivotally connected to the frame; the positioning disc is provided with a brake groove, and a drum brake component is provided in the brake groove, so that the drum brake component brakes the positioning disc; the drum brake component is hinged to the electric push rod, and the brake on the positioning disc is released when the electric push rod is shortened;

The positioning plate is provided with a C-shaped regulating groove on the side opposite to the positioning assembly, and the positioning assembly has a regulating pin, which is embedded in the C-shaped regulating groove for movement; the electric push rod is shortened to release the braking of the positioning plate by the drum brake component, and the drive shaft drives the regulating pin to rotate through the positioning assembly, and drives the positioning plate to rotate cooperatively when it touches the end of the C-shaped regulating groove. When the user stretches the muscle to the maximum angle, the electric push rod is extended, the drum brake component expands, and the positioning plate is braked, completing the mechanical braking setting of the first mechanical braking protection mechanism.

As an improvement to the above technical solution, the drum brake component includes an elliptical brake sleeve rotatably arranged on the drive shaft, a brake plate fixedly arranged on the brake sleeve, an upper brake pad and a lower brake pad arranged on the periphery of the brake sleeve and hinged to each other at one end by a limit pin, and the upper brake pad and the lower brake pad are provided with a brake spring assembly on the opposite side of the hinged end to provide braking force for the upper brake pad and the lower brake pad, and the brake plate is hinged to the electric push rod; the limit pin is hinged with a drum brake support plate, and the drum brake support plate is fixedly connected to the frame.

As an improvement to the above technical solution, the brake spring assembly includes an adjustment pin, an adjustment spring and an adjustment nut, wherein the adjustment pin is fixed on the upper brake pad, the upper brake pad is provided with a groove for the adjustment pin to be embedded, the circumference of the adjustment pin is provided with an adjustment spring, and the upper part of the adjustment pin is installed with an adjustment nut. The braking force of the adjustment spring on the upper brake pad and the lower brake pad can be adjusted by adjusting the upper and lower positions of the nut.

As an improvement to the above technical solution, the positioning assembly includes a positioning plate, and the regulating pin is arranged on the positioning plate; on the opposite side of the regulating pin, the positioning plate is provided with a positioning pointer constituting an extended end of the positioning plate.

As an improvement to the above technical solution, a torsion spring is arranged inside the brake groove of the positioning plate, one end of the torsion spring is fixedly connected to the upper brake pad or the lower brake pad, and the other end is connected to the positioning plate to provide a restoring force for the positioning plate.

As an improvement to the above technical solution, the angle formed by the two groove end points of the C-shaped regulating groove and the center of the positioning wheel satisfies 90 degrees < angle ≤ 180 degrees.

The electric push rod can be used to brake the maximum rotation angle of the positioning plate. When the positioning component rotates with the drive shaft, the regulating pin touches the end of the C-shaped regulating groove, driving the positioning plate to rotate. When it rotates to the maximum angle, the electric push rod brakes the positioning plate, thereby controlling the maximum flipping angle of the leg board. The maximum flipping angle of the leg board can be adjusted through the first mechanical brake protection mechanism, thereby improving the leg training effect of the stretching chair.

The first photoelectric control mechanism comprises:

The first photoelectric switch sensor is fixedly arranged on the periphery of the positioning plate on one side; when the tensioning rod swings to the high position, the positioning assembly first blocks the first photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction;

The second photoelectric switch sensor is fixedly arranged on the periphery of another positioning plate; when the tensioning rod swings to the high position, if the positioning component blocks the first photoelectric switch sensor without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor and sends a reversal signal before the mechanical brake, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction;

The third photoelectric switch sensor is arranged on the frame; the first shielding piece is arranged on the leg plate connecting piece; when the tensioning bar swings to the horizontal position, the leg plate connecting piece swings down to shield the third photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part and the leg plate connecting piece cooperate to swing upward in the opposite direction;

The fourth photoelectric switch sensor is arranged on the frame; the second shielding piece is arranged on one side of the leg plate; during the retracting and extending swinging, the leg plate swings from horizontal to vertical, and when the second shielding piece shields the fourth photoelectric switch sensor, a braking signal is sent out to stop the retracting and extending swinging.

It should be noted that the first photoelectric switch sensor and the second photoelectric switch sensor can be arranged on one positioning plate, or respectively on two positioning plates, but they are slightly misaligned in space, that is, the positioning pointer of the positioning component will first block the first photoelectric switch sensor during the upward swing process, and will block the second photoelectric switch sensor when the first photoelectric switch sensor fails. When the first photoelectric switch sensor and the second photoelectric switch sensor fail at the same time, the regulating pin of the positioning component touches the upper top of the C-shaped regulating groove of the positioning plate, and is mechanically braked by the first mechanical brake protection mechanism.

When the driving shaft drives the leg board to flip to the highest position and then rotates in the opposite direction by a certain angle, the first shielding piece will block the third photoelectric switch sensor. After receiving the signal from the third photoelectric switch sensor, the controller will drive the power motor to drive the driving shaft to rotate in the opposite direction again, thereby driving the leg board to flip upward, thereby realizing the reciprocating stretching and swinging action of the leg board.

When the stretching chair is stored in a folded state, the backboard and the leg board are in a vertical state. At this time, the second shielding member blocks the fourth photoelectric switch sensor. After receiving the signal, the controller stops the power motor and keeps the stretching chair in the folded state.

The first photoelectric switch sensor and the second photoelectric switch sensor output a control signal when the positioning pointer is blocked; the third photoelectric switch sensor, The fourth photoelectric switch sensor outputs a control signal when being blocked by the first blocking piece and the second blocking piece respectively at a low position.

The control of the reciprocating stretching and swinging action is completed by the first photoelectric switch sensor and the third photoelectric switch sensor. The first photoelectric switch sensor is arranged at the front side of the second photoelectric switch sensor, so that the leg plate part swings downward in the reverse direction when the stretching and swinging upward reaches the detection position of the first photoelectric switch sensor, and at this time, the positioning pointer of the positioning component blocks the first photoelectric switch sensor; the third photoelectric switch sensor outputs a control signal when the first shielding sheet blocks it, so that the leg plate part swings upward in the reverse direction when it swings downward to the detection position of the third photoelectric switch sensor.

The second photoelectric switch sensor is arranged in front of the mechanical brake limit position, so that the brake signal sent by the second photoelectric switch sensor precedes the mechanical brake and sends a reverse swing signal. The fourth photoelectric switch sensor outputs a brake signal when the second shielding sheet blocks, and the retracting and releasing swinging stops.

The above-mentioned safety mechanism of the present application realizes triple protection when in high position, namely, the first is the reverse swing control protection of the first photoelectric switch sensor, the second is the reverse swing control protection of the second photoelectric switch sensor in the event of control failure of the first photoelectric switch sensor, and the third is the mechanical braking protection of the first mechanical brake protection mechanism in the event of reverse protection failure of the second photoelectric switch sensor.

The first situation of the safety mechanism with triple protection of the present invention is two photoelectric switch sensors plus a first mechanical brake protection mechanism, which can set the reversing position of the user's normal stretching angle, the braking position after the reversing failure, and the mechanical braking position of the maximum stretching angle respectively. Triple protection is used in the safety design of stretching training to prevent personal injury.

In the present invention, the first photoelectric switch sensor and the second photoelectric switch sensor are arranged on the opposite sides of the regulating pin shaft, and the positions are both before the mechanical braking position. The first photoelectric switch sensor is fixed on the positioning plate on one side of the fitness chair, and the second photoelectric switch sensor is fixed on the positioning plate on the other side of the fitness chair. The first photoelectric switch sensor blocks the driving shaft first when it swings upward, and sends a reverse swing signal to make the driving shaft swing in the reverse direction, thereby constituting the first level of protection for the fitness chair.

The second photoelectric switch sensor is located between the mechanical brake and the first photoelectric switch sensor, and is earlier than the mechanical brake but later than the first photoelectric switch sensor. When the first photoelectric switch sensor is out of control, the drive shaft will continue to swing upward to block the second photoelectric switch sensor, send out a reverse signal, and make the leg board swing down, forming the second protection of the fitness chair.

If the first photoelectric switch sensor and the second photoelectric switch sensor lose control one after another, the drive shaft will swing upward again to drive the regulating pin on the positioning assembly to swing upward. When the regulating pin touches the end of the C-shaped regulating groove, mechanical braking is applied to prevent it from exceeding the set maximum stretching angle, thereby forming the third level of protection for the fitness chair.

The reversal of the fitness chair when in a horizontal position is controlled by a third photoelectric switch sensor, and a swing shielding piece is provided on the leg board connecting piece. When the leg board part swings down to a horizontal position, it shields the third photoelectric switch sensor and swings in a reverse direction.

The working principle of the first mechanical brake protection mechanism is:

In the idle state, the electric push rod is in a retracted state, and the drum brake component is separated from the positioning plate.

When setting the maximum stretching angle, the positioning plate and the drum brake component are disengaged, and the positioning plate can rotate relative to the drum brake component. The drive shaft moves to cause the leg plate to swing from the horizontal upward stretching angle, and the drive shaft drives the positioning plate to swing. The positioning plate drives the regulating pin to swing in the C-shaped regulating groove, and the regulating pin drives the positioning plate to swing when it touches the end point of the C-shaped regulating groove. When the leg plate swings to the maximum angle, that is, the maximum angle that the trainee can tolerate, the electric push rod extends, and the brake spring assembly acts to lock the positioning plate and the drum brake component, thereby setting the mechanical brake position.

During the swing of the tensioning bar, the positioning plate and drum brake components in the first mechanical brake protection mechanism are in a braking state, and the drive shaft only drives the positioning assembly to swing. Due to the safety protection of the first photoelectric switch sensor and the second photoelectric switch sensor, the regulating pin shaft will not touch the end point of the C-shaped regulating groove and will swing back and forth within the range limited by the C-shaped regulating groove.

After the reinforcement is stretched, the electric push rod is shortened, the positioning plate and drum brake components are disengaged, the maximum angle limit is removed, the torsion spring acts on the positioning plate, and the positioning plate follows the positioning plate and the regulating pin shaft to reset.

As an improvement to the above technical solution, the second mechanical brake protection mechanism includes

Electric cylinder, used to output safety braking force at the high point of the tie rod swing;

A positioning wheel, rotatably arranged at the outer end of the driving shaft, wherein the positioning wheel is provided with a C-shaped regulating groove on the inner side;

A support plate is fixedly arranged on the frame;

Two brake rods are arranged on both sides of the periphery of the positioning wheel disc and are pivotally connected to one side of the support plate through a support shaft; the lower ends of the two brake rods are hinged to the head and tail of the electric cylinder, and when the electric cylinder is extended and retracted, the two brake rods are swung open and closed with the support shaft as the center, so that the front end of the brake rods is engaged with or disengaged from the positioning wheel disc, braking is applied when engaged, and releasing the brake when disengaged;

A positioning arm is mounted on the driving shaft, and a positioning shaft is provided on the positioning arm and is embedded in the C-shaped regulating groove and moves with the positioning arm;

The driving shaft drives the positioning shaft to rotate through the positioning arm, and when it touches the end of the C-shaped regulating groove, it drives the positioning wheel to rotate in coordination. When the user stretches the tendons to the maximum angle, the electric cylinder applies force, the brake rod engages with the positioning wheel, brakes the positioning wheel, and completes the second mechanical brake protection. Mechanical brake setting of the mechanism.

As an improvement to the above technical solution, the positioning wheel is a positioning gear, the brake rod is a brake arm, and a rack is embedded in the front end of the brake arm, which meshes with the positioning gear during braking.

As an improvement to the above technical solution, a rope groove wheel is arranged on the outside of the positioning wheel disc, and a reset wire rope is fixed and wound in the wheel groove of the rope groove wheel. The reset wire rope is connected to a cylindrical threaded tension spring after passing through the steering wheel assembly, and the other end of the cylindrical threaded tension spring is fixedly connected to the frame.

As an improvement to the above technical solution, the steering wheel assembly includes a steering shaft and a steering wheel rotatably arranged on the steering shaft, and the steering shaft is fixedly connected to the frame.

As an improvement to the above technical solution, the angle formed by the two groove end points of the C-shaped regulating groove and the center of the positioning plate satisfies 90 degrees < angle ≤ 180 degrees.

The second photoelectric control mechanism comprises:

The fifth photoelectric switch sensor is arranged at the top of the front side of the frame; the third shielding piece is arranged at the rear of the leg plate; during the retracting and extending swinging, the leg plate swings from horizontal to vertical, and when the third shielding piece shields the fifth photoelectric switch sensor, a braking signal is sent to stop the retracting and extending swinging;

The sixth photoelectric switch sensor is arranged at the top of the middle part of the frame; when the tensioning rod swings to the horizontal position, the driven connecting rod blocks the sixth photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part and the leg plate connecting piece cooperate to swing upward in the opposite direction;

The seventh photoelectric switch sensor is arranged on a positioning wheel; when the tensioning arm swings to a high position, the positioning arm first blocks the seventh photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction;

The eighth photoelectric switch sensor is arranged on the positioning wheel on the other side and is spatially offset from the seventh photoelectric switch sensor; when the tensioning arm swings to a high position, if the seventh photoelectric switch sensor fails and does not send a reversal signal, the corresponding positioning arm blocks the eighth photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the driven connecting rod, the leg plate part, and the leg plate connecting piece to swing downward in the opposite direction in coordination.

The above-mentioned safety mechanism is the second case of the safety mechanism with triple protection of the present invention. Through the combination of an electric cylinder, a positioning gear, a C-shaped regulating groove, two brake rods, two racks, two photoelectric switch sensors (the seventh photoelectric switch sensor, the eighth photoelectric switch sensor), a positioning arm, and a positioning shaft, it is possible to set the three different functional positions of the reversing position of the highest point of the stretching swing, the safety braking position, and the safety braking position of the maximum angle of the stretching, thereby achieving triple protection to ensure the safe use of the fitness chair.

The positions of the seventh photoelectric switch sensor and the eighth photoelectric switch sensor are both before the mechanical brake position of the second mechanical brake protection mechanism. The seventh photoelectric switch sensor is at the first blocking position during the rotation of the positioning gear, and is a reversing switch for the high point of the swaying of the tie rod. The swaying of the tie rod changes direction after reaching the high point of the swaying at this position. The eighth photoelectric switch sensor is located between the seventh photoelectric switch sensor and the mechanical brake position of the second mechanical brake protection mechanism, and is also a reversing switch. When the seventh photoelectric switch sensor may fail and the drive shaft swings upward again, a reversing signal is sent out, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction.

The second mechanical brake protection mechanism is the final safety guarantee of the safety mechanism, and is a safety brake guarantee in the event that both photoelectric switch sensors (the seventh photoelectric switch sensor and the eighth photoelectric switch sensor) may all fail.

The second mechanical brake protection mechanism of the present invention completes the mechanical brake setting of the second mechanical brake protection mechanism through the combination of an electric cylinder, a positioning gear, a C-shaped regulating groove, two brake rods, two racks, a positioning arm, and a positioning shaft.

The specific setting of the second mechanical brake protection mechanism is that the two brake levers are opened, the rack of the brake lever is disengaged from the positioning gear, and the positioning shaft on the positioning arm swings in the C-shaped regulating groove as the drive shaft swings, and the positioning gear is driven to swing when it touches the end point of the C-shaped regulating groove. At the maximum tensioning angle that the user can bear, the two brake levers are closed toward each other, the rack of the brake lever is meshed with the positioning gear to brake the drive shaft, thereby setting the mechanical brake position.

After the angle setting is completed, the equipment swings up and down according to the set number of tensioning times; when the tensioning is completed, the two brake levers are released, the braking force disappears, the reset wire rope pulls the positioning gear, follows the positioning shaft to reset, and then the drive shaft resets.

The above-mentioned safety mechanism realizes triple protection when in high position. The first is the reverse swing control protection of the seventh photoelectric switch sensor. The second is the reverse swing control protection of the eighth photoelectric switch sensor in the event of control failure of the seventh photoelectric switch sensor. The third is the mechanical braking protection of the second mechanical brake protection mechanism in the event of reverse swing control failure of the eighth photoelectric switch sensor.

Compared with the previous mechanical brake protection mechanism, the structure is simpler and the operation is simpler, but the function is the same, that is, to achieve upper reversal and safety braking when the fitness chair is stretched and swung. Since the angle formed by the two end points of the C-shaped regulating groove and the center of the positioning plate satisfies 90 degrees < angle ≤ 180 degrees, during the stretching swing, the positioning shaft will not touch the end points of the C-shaped regulating groove and will swing back and forth within the range limited by the C-shaped regulating groove. At the same time, the maximum swing angle of the stretching can be 180 degrees.

In actual use, the first mechanical brake protection mechanism and the second mechanical brake protection mechanism can be interchangeable, and the corresponding first photoelectric control mechanism and the second photoelectric control mechanism are replaced accordingly, and their installation positions change with the changes of the first mechanical brake protection mechanism and the second mechanical brake protection mechanism.

The present invention also provides a working method of a fitness chair, characterized in that the working method comprises the following steps:

S1, the fitness chair is stationary, in the seat state, the clutch mechanism is in the engaged state, the traction spring in the walking traction mechanism is in the stretched state, and the traction spring stores energy;

S2, the person sits on the fitness chair and sets the number of stretching times on the fitness chair through the controller;

S3, click the power start button, the power motor is powered, the drive shaft drives the active connecting rod to swing, and the driven connecting rod pushes the leg plate to swing upward from vertical; at the same time, with the swing of the active connecting rod, the back plate loses support, the energy stored in the pulling spring is released, the second pulling rope pulls the double-groove rope wheel to rotate, and the fitness chair moves forward, so that the fitness chair changes from a seat state to a bed state; when the leg plate reaches a horizontal position, it touches the photoelectric switch sensor of the first photoelectric control mechanism or the second photoelectric control mechanism, turns off the power motor, and stops swinging;

S4, maximum swing angle setting: after the person lies flat, the handle switch is pushed down, the power motor drives the active connecting rod to continue to rotate, and the driven connecting rod, the leg board connecting piece, and the leg board part are pushed upward in coordinated motion; when the swing reaches the maximum angle that the user can bear, the handle switch is immediately released, the power motor stops moving, the confirmation button on the handle switch is clicked, the positioning plate or the positioning wheel is locked, and the maximum swing angle setting is completed; that is, the first mechanical brake protection mechanism or the second mechanical brake protection mechanism completes the mechanical brake setting of the maximum angle;

S5. After locking the positioning plate or positioning wheel, the power motor reverses and the leg plate swings downward. When it reaches the horizontal position, the photoelectric switch issues a command, the power motor reverses and the leg plate swings upward. This is repeated until the set number of stretching times is completed and the leg plate is at the maximum angle. The photoelectric switch issues a command, the power motor stops rotating, and the electric push rod shortens to disengage the drum brake component from the brake disc, or the electric cylinder is actuated to disengage the brake rod from the positioning gear.

S6, the positioning plate or the positioning wheel releases the brake, the power motor reverses, the driven connecting rod, the leg plate connecting piece, and the leg plate part cooperate to swing down and swing to a horizontal position, the power motor continues to rotate, so that the leg plate part and the back plate part change to a seat state position, and at the same time the fitness chair moves backward to the initial position, the positioning plate rotates with the control pin shaft or the positioning wheel rotates with the positioning shaft to the initial position; the pulling spring returns to the stretched state to store energy; this fitness chair stretching is completed;

S7. If the fitness chair needs to be pushed, the clutch mechanism is disconnected to disengage the clutch mechanism from the walking traction mechanism. Compared with the prior art, the advantages and positive effects of the present invention are:

The fitness chair of the present invention can be adjusted to three states of sitting, lying, and stretching exercise training and rehabilitation according to the situation through the design of the movable mechanism between the frame and the leg plate part and the back plate part. 1. When used in an ordinary family, the fitness chair can be placed against the wall to reduce the space occupied by the equipment. At this time, the leg plate part and the back plate part are in a vertical state, the power source does not output power, and the fitness chair is folded into a seat state. 2. When the power source is working, the drive shaft drives the active connecting rod to perform a retracting and releasing swinging action, and the active connecting rod drives the driven connecting rod to push the leg plate part to swing around the pivot axis. The leg plate part makes the first step of swinging to a horizontal state, driving the user's calf to swing to be flush with the user's thigh. At this time, if the fitness chair no longer swings upward and maintains this state, the user can lie flat on the fitness chair, and the fitness chair unfolds to a lying flat state. 3. The leg board of the fitness chair swings upward again and enters the stretching and swinging state. The user can drive the leg board to perform reciprocating stretching and swinging movements through the power motor. Healthy people can complete stretching exercises, and paralyzed patients can lie on the fitness chair and drive the patient's legs to perform reciprocating movements through the movement of the leg board, thereby achieving the leg rehabilitation exercise effect for paralyzed patients.

The upward swing angle of the leg plate is adjustable, and can be adjusted according to different uses, so that it is suitable for a wide range of customer groups. The whole device has a simple structure and is easy to operate, which effectively improves the stretching exercise effect of the fitness chair.

According to another aspect of the present invention, the present application provides two swing angle limiting braking protection mechanisms for use in situations where there are certain requirements for the rotation angle.

In the field of mechanics, the rotating device is a commonly used component with a wide range of applications. Due to the special needs of some operations, the rotating device needs to limit the rotation angle, while the existing rotating devices generally drive the target object to rotate 360 degrees around a certain target object, covering unnecessary rotation angles and not meeting the needs of special operations.

A swing angle limiting braking protection mechanism, comprising:

A power motor is arranged on the frame and has a driving shaft to output swing power;

The positioning assembly is fixedly arranged at the outer end of the drive shaft.

The positioning plate is rotatably mounted on the outer end of the drive shaft.

Electric push rod; pivotally connected to the frame;

The positioning disc is provided with a brake groove, and a drum brake component is provided in the brake groove, so that the drum brake component brakes the positioning disc; It is hinged with the electric push rod, and releases the brake on the positioning plate when the electric push rod is shortened;

The positioning plate is provided with a C-shaped regulating groove on the side opposite to the positioning assembly, and the positioning assembly has a regulating pin, which is embedded in the C-shaped regulating groove for movement;

The electric push rod shortens to release the brake of the drum brake component on the positioning plate. The drive shaft drives the control pin to rotate through the positioning assembly, and when it touches the end of the C-shaped control slot, it drives the positioning plate to rotate in coordination. At the set swing angle position, the electric push rod extends, the drum brake component expands, and the positioning plate is mechanically braked.

As an improvement to the above technical solution, the drum brake component includes:

The brake sleeve has an elliptical outer circumference and is rotatably arranged on the drive shaft.

The brake plate is fixed on the brake sleeve.

The upper brake pad and the lower brake pad are arranged on the periphery of the brake sleeve and are hinged to each other at one end through a limit pin;

The upper brake pad and the lower brake pad are provided with brake spring assemblies on the opposite sides of the hinged ends to provide braking force for the upper brake pad and the lower brake pad, and the brake plate is hinged to the electric push rod; the limit pin shaft is hinged with a drum brake support plate, and the drum brake support plate is fixedly connected to the frame.

As an improvement to the above technical solution, the brake spring assembly includes an adjusting pin, an adjusting spring and an adjusting nut. The adjusting pin is fixed on the upper brake pad, the lower brake pad is provided with a groove for the adjusting pin to be embedded, the periphery of the adjusting pin is provided with an adjusting spring, and an adjusting nut is installed on the upper part of the adjusting pin to compress the adjusting spring.

As an improvement to the above technical solution, the positioning assembly includes a positioning plate, and the regulating pin is arranged on the positioning plate; on the opposite side of the regulating pin, the positioning plate is provided with a positioning pointer constituting an extended end of the positioning plate.

As an improvement to the above technical solution, a torsion spring is arranged inside the brake groove of the positioning plate, one end of the torsion spring is fixedly connected to the upper brake pad or the lower brake pad, and the other end is connected to the positioning plate to provide a restoring force for the positioning plate.

As an improvement to the above technical solution, there are two power motors, and correspondingly, there are two sets of positioning components, positioning plates, and electric push rods;

A first photoelectric switch sensor is fixedly arranged on the periphery of a positioning plate. When the driving shaft swings upward, the positioning assembly blocks the first photoelectric switch sensor before the mechanical brake, and sends a reverse signal to make the driving shaft swing downward.

A second photoelectric switch sensor is fixedly provided on the periphery of the other positioning plate. When the drive shaft swings upward, if the positioning component blocks the first photoelectric switch sensor without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the drive shaft to swing downward in the opposite direction.

Another swing angle limiting braking protection mechanism provided by the present application includes:

A power motor is arranged on the frame and has a driving shaft to output swing power;

Electric cylinder, used to output safety braking force at the high point of the swing;

A positioning wheel disc is rotatably arranged at the outer end of the driving shaft, and a C-shaped regulating groove is arranged on the inner side of the positioning wheel disc;

A support plate is fixedly arranged on the frame;

Two brake rods are arranged on both sides of the periphery of the positioning wheel disc and are pivotally connected to one side of the support plate through a support shaft; the lower ends of the two brake rods are hinged to the head and tail of the electric cylinder, and when the electric cylinder is extended and retracted, the two brake rods are swung open and closed with the support shaft as the center, so that the front end of the brake rods is engaged with or disengaged from the positioning wheel disc, braking is applied when engaged, and releasing the brake when disengaged;

The positioning arm is fixedly mounted on the driving shaft, and the positioning arm is provided with a positioning shaft which is embedded in the C-shaped regulating groove and moves with the positioning arm;

The driving shaft drives the positioning shaft to rotate through the positioning arm, and drives the positioning wheel to rotate in coordination when it touches the end of the C-shaped regulating groove; when the electric cylinder applies force, the brake rod engages with the positioning wheel to brake the positioning wheel and set the maximum swing angle of the driving shaft.

As an improvement to the above technical solution, the positioning wheel is a positioning gear, the brake rod is a brake arm, and a rack is embedded in the front end of the brake arm, which meshes with the positioning gear during braking.

As an improvement to the above technical solution, a rope groove wheel is arranged on the outside of the positioning wheel disc, and a reset wire rope is fixed and wound in the wheel groove of the rope groove wheel. The reset wire rope is connected to a cylindrical threaded tension spring after passing through the steering wheel assembly, and the other end of the cylindrical threaded tension spring is fixedly connected to the frame.

As an improvement to the above technical solution, the steering wheel assembly includes a steering shaft and a steering wheel rotatably arranged on the steering shaft, and the steering shaft is fixedly connected to the frame.

As an improvement to the above technical solution, there are two power motors, and two sets of corresponding electric cylinders, positioning gears, and positioning arms;

A seventh photoelectric switch sensor is arranged on a positioning wheel. When the driving shaft swings upward to a high position, the positioning arm first blocks the seventh photoelectric switch sensor and sends a reverse signal to make the driving shaft swing downward in the opposite direction.

The other positioning gear is provided with an eighth photoelectric switch sensor, which is spatially offset from the seventh photoelectric switch sensor; when the drive shaft swings upward to a high position, if the seventh photoelectric switch sensor fails and does not send a reverse signal, the corresponding positioning arm blocks the eighth photoelectric switch sensor, and sends a reverse signal before the mechanical brake, so that the drive shaft swings downward in the opposite direction;

In the above two swing angle limiting braking protection mechanisms, the angle formed by the two groove end points of the C-shaped regulating groove and the center of the positioning gear satisfies 90 degrees < angle ≤ 180 degrees.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the embodiments or the prior art are described below.

The accompanying drawings required for use are briefly introduced. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

FIG1 is a schematic structural diagram of the fitness chair of Example 1 in a sitting position;

FIG2 is a structural diagram of the fitness chair of Example 1 in an unfolded state;

FIG3 is a schematic diagram of the connection structure of the connecting rod mechanism, the back plate portion, and the leg plate portion in the sitting state in Example 1;

FIG4 is a schematic diagram of the connection structure of the connecting rod mechanism, the back plate portion, and the leg plate portion in the unfolded state in Example 1;

FIG5 is a schematic diagram of the structure of the position limiting assembly in the folded state in Embodiment 1;

FIG6 is a schematic diagram of the structure of the limit assembly in the expanded state in Example 1;

FIG7 is a schematic structural diagram of the first mechanical brake protection mechanism in Embodiment 1 viewed from the outside to the inside;

FIG8 is a schematic structural diagram of the first mechanical brake protection mechanism in Embodiment 1 viewed from the outside;

FIG9 is a schematic diagram of the structure in which the short shaft of the brake sleeve acts on the upper brake pad and the lower brake pad in Example 1;

10 is a schematic diagram of the structure in which the long axis of the brake sleeve acts on the upper brake pad and the lower brake pad in Example 1;

FIG11 is a schematic cross-sectional view of the brake spring assembly in Example 1;

12 is a schematic diagram of the installation structure of the walking traction mechanism in Example 1;

FIG13 is a schematic structural diagram of the clutch mechanism in Example 1;

FIG14 is a schematic diagram of the three-dimensional structure of the clutch mechanism of Example 1;

FIG15 is a schematic diagram of the three-dimensional structure of the walking mechanism of Example 1;

FIG16 is a schematic diagram of the connection structure of the tension spring and the guide wheel assembly of Example 1;

FIG17 is a schematic diagram of the frame structure of the fitness chair of Example 2;

FIG18 is a schematic structural diagram of the fitness chair of Example 2 in a sitting position;

FIG19 is a schematic structural diagram of the fitness chair of Example 2 in an unfolded state;

20 is a schematic diagram of the connection structure of the connecting rod mechanism, the back plate portion, and the second mechanical brake protection mechanism of Example 2;

FIG21 is a schematic diagram of the installation structure of the second mechanical brake protection mechanism of Example 2;

FIG22 is a schematic diagram of the composition structure of the second mechanical brake protection mechanism of Example 2;

FIG23 is a schematic diagram of the composition structure of the second mechanical brake protection mechanism of Example 2 viewed from another angle;

FIG24 is a schematic diagram of the installation structure of the photoelectric control mechanism of Example 2;

FIG. 25 is a flowchart of the work flow control of the fitness chair of Embodiment 1 and Embodiment 2. FIG.

Reference numerals: 1, frame; 3, walking traction mechanism; 4, clutch mechanism; 5, power motor; 6, connecting rod mechanism; 7, first mechanical brake protection mechanism; 8, second mechanical brake protection mechanism;

101, seat plate; 102, bottom frame; 103, side frame; 104, seat plate support frame; 105, motor fixing plate; 106, protection plate; 107, back plate support plate;

201, back plate; 203, leg plate; 204, back plate mounting member; 205, leg plate connecting member; 206, leg plate mounting member; 207, leg plate connecting shaft; 208, limit tension spring; 209, fourth photoelectric switch sensor; 2041, gear groove; 2051, limit stopper;

301, pulling spring; 302, second pulling rope; 303, first pulling rope; 304, double-groove rope wheel; 305, driving shaft; 306, driving walking wheel; 307, driven walking wheel; 308, guide wheel assembly; 309, rear bracket; 310, front bracket; 311, spring connecting plate; 312, spring seat plate; 313, first guide wheel; 314, second guide wheel; 315, third guide wheel; 316, fourth guide wheel;

401, hand crank; 402, eccentric wheel; 403, clutch mounting frame; 404, movable connecting rod; 405, first coupling member; 406, second coupling member; 407, clutch sleeve; 408, limit sleeve; 409, return spring;

501, drive shaft;

601, active connecting rod; 602, driven connecting rod; 603, protective cover; 604, second limit block; 6011, first limit block; 6012, shift pin; 6013, shaft pin; 6014, bearing; 6015, pivot pin;

701, positioning plate; 702, electric push rod; 703, positioning assembly; 705, brake plate; 706, drum brake support plate; 707, limit pin; 708, upper brake pad; 709, lower brake pad; 710, brake sleeve; 711, torsion spring; 712, brake spring assembly; 714, reset pin; 7011, 807, C-shaped regulating groove, 7031 regulating pin; 7032, positioning pointer; 7122, regulating pin; 7123, regulating spring; 7124, regulating nut;

801, electric cylinder; 802, positioning gear; 803, support plate; 804, brake rod; 805, rack; 806, positioning arm; 808, wire rope; 809, cylindrical thread tension spring; 810, steering wheel;

901, first photoelectric switch sensor; 902, second photoelectric switch sensor; 903, first shielding piece; 904, third photoelectric switch sensor; 905, fourth photoelectric switch sensor, 906, second shielding piece; 907, fifth photoelectric switch sensor; 908, third shielding piece; 909, sixth photoelectric switch sensor; 910, seventh photoelectric switch sensor.

DETAILED DESCRIPTION

The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

Example 1

As shown in FIGS. 1 to 16 , a fitness chair provided in this embodiment 1 includes:

The frame 1 includes a horizontally fixed seat plate 101, which provides support for the user to lie down and sit;

A power source fixed on the frame 1 for outputting power; providing working power for the fitness chair of the present application;

An active mechanism that completes the retracting and extending swing and the stretching and swinging under the drive of a power source;

A walking mechanism for moving the frame 1 under the drive of a power source;

A safety mechanism that provides triple protection for the user during stretching swing;

The walking mechanism includes a walking traction mechanism 3 for driving the frame 1 to move, and a clutch mechanism 4 for separating and engaging the walking traction mechanism 3 and the frame;

The safety mechanism includes a photoelectric control mechanism and a mechanical brake protection mechanism; the photoelectric control mechanism includes a first photoelectric control mechanism or a second photoelectric control mechanism, and the corresponding mechanical brake protection mechanism is a first mechanical brake protection mechanism 7 or a second mechanical brake protection mechanism 8.

The frame 1 includes a seat 101, a bottom frame 102, side frames 103 arranged on both sides of the bottom frame 102, and a seat support frame 104 located between the two side frames 103; the bottom frame 102, the side frames 103, and the seat support frame 104 are frame structures, and the side frames 103 are arranged vertically; the seat 101 is fixed on the seat support frame 104 and is located between the two side frames 103; a motor fixing plate 105 is arranged on the inner side of the side frame 103 to fix and support the power source; a protection plate 106 is arranged on the upper side, front side, rear side, and outer side of the side frame 103, so that the power source is wrapped in the surrounding structure formed by the side frames 103, the motor fixing plate 105, and the protection plate 106 to ensure the safety of the user. The frame 1 is provided with a backboard support plate 107 at the rear to support the backboard when the backboard swings down to a horizontal level.

The power source is a power motor 5 with a reducer, and the power motor 5 has a drive shaft 501. Functionally, the drive shaft 501 is a single output shaft or a double output shaft, which is suitable for the fitness chair of the present application, but based on installation considerations, the power motor 5 selected in the present application is a double output shaft, so that the safety mechanism and the movable mechanism can be installed on the output shafts at different output ends respectively, avoiding the safety mechanism and the movable mechanism being densely installed on one end of the output shaft.

There are two power motors 5, which are respectively located in the frame structure of the two side frames 103 and fixedly connected to the motor fixing plate 105. One output end of the drive shaft 501 extends from the opening of the motor fixing plate 105 and faces the center of the seat plate 101 for installing the movable mechanism, and the other output end extends away from it but is located in the surrounding structure of the side frame 103 for installing the safety mechanism. The power motor 5 has a reducer and is the power source for the power output of the fitness chair of the present invention.

The movable mechanism includes a back plate portion, a leg plate portion, a connecting rod mechanism 6 , and a leg plate connecting piece 205 .

The leg plate portion is composed of a leg plate 203 and a leg plate mounting member 206 disposed above the left and right sides of the leg plate 203 .

The connecting rod mechanism 6 includes an active connecting rod 601 and a driven connecting rod 602. One end of the active connecting rod 601 is fixedly connected to the driving shaft 501. The other end of the active connecting rod 601 is provided with a pivot pin and pivotally connected to one end of the transmission connecting rod 602. The other end of the driven connecting rod 602 is pivotally connected to the leg plate mounting member 206. During the retracting and extending swinging, the active connecting rod 601 acts only on the leg plate part through the driven connecting rod 602 to make the leg plate part swing, and the leg plate part swings from the vertical upward. to horizontal or from horizontal to vertical.

One end of the leg plate connecting member 205 is pivotally connected to the driving shaft 501 , and the other end is pivotally connected to the leg plate 203 via the leg plate connecting shaft 207 .

A first limit block 6011 is provided at the far end of the active connecting rod; during the stretching swing, the top of the first limit block 6011 conflicts with the lower bottom surface of the driven connecting rod 602. At this time, the active connecting rod 601 and the driven connecting rod 602 have no mutual movement, so that the driven connecting rod 602 only supports the leg plate part and no longer applies force to the leg plate 203. The active connecting rod 601 pushes the driven connecting rod 602, the leg plate mounting part 206, the leg plate 203, and the leg plate connecting part 205 to move in coordination, and perform the stretching swing from horizontal to high position and then from high position to horizontal.

In this embodiment, the back plate portion is composed of a back plate 201 and back plate mounting members 204 disposed below the left and right sides of the back plate 201, and the back plate portion is rotatably connected to the drive shaft 501 through the back plate mounting members 204. A shifting groove 2041 is disposed below the back plate mounting member 204, and a shifting pin 6012 is disposed on the left side of the other end of the active connecting rod 601 and is engaged with the shifting groove 2041 disposed at the bottom of the back plate mounting member 204 through the shifting pin 6012; when the back plate 201 is in a vertical state, the shifting pin 6012 is located in the shifting groove 2041; when the back plate 201 is transformed to a horizontal state, the active connecting rod 601 drives the shifting pin 6012 to rotate downward, and the back plate 201 rotates downward under the action of gravity and gradually transforms to a horizontal state ... in a horizontal state, the active connecting rod 601 drives the shifting pin 6012 to rotate downward, and the back plate 201 rotates downward under the action of gravity and gradually transforms to a horizontal state; when the back plate 201 is in a vertical state, the shifting pin 6012 is located in the shifting groove 2041; when the back plate 201 is in a vertical state, the shifting pin 6 When 201 is in a horizontal state, the back panel 201 is placed on the frame 1, and is supported and limited by the back panel support plate 107 provided at the rear of the frame 1, and no longer swings downward, and the shift pin 6012 swings with the active connecting rod 601 and comes out of the shift groove 2041; the back panel 201 and the back panel mounting member 204 constitute the back panel part, of course, the back panel part can be an integrated component, and the back panel 201 and the back panel mounting member 204 are made into separate parts here for the convenience of installation and maintenance, and the back panel mounting member 204 can be easily replaced if it is worn during use.

The leg plate portion is composed of a leg plate 203 and a leg plate mounting member 206 disposed above the left and right sides of the leg plate 203. The leg plate 203 is located at the front side of the seat plate 101. The leg plate 203 is provided with a leg plate connecting shaft 207 (pivot shaft) on both sides of one end of the leg plate 203 close to the seat plate 101. The leg plate connecting shaft 207 is pivotally connected to one end of the leg plate connecting member 205 through the leg plate connecting shaft 207. The other end of the leg plate connecting member 205 is rotatably connected to the drive shaft 501. A limited position assembly is provided between the leg plate mounting member 206 and the leg plate connecting member 205. The leg plate mounting member 206 is powered by the connecting rod mechanism 6 and the leg plate 203. The power of the drive shaft 501 is transmitted to the leg plate 203 by the connecting rod mechanism 6 and the leg plate mounting member 206. Similarly, the leg plate portion can also be an integral component. Here, the leg plate 203 and the two leg plate mounting members 206 are made into separate parts for easy installation and maintenance. At the same time, the arrangement of the leg plate mounting member enables the leg plate portion and the driven connecting rod to form a larger force arm.

The limiting assembly includes a first limiting pin, a second limiting pin, a limiting stopper 2051, and a limiting tension spring 208; the first limiting pin is arranged at two outer sides of one end of the leg plate connecting member 205 close to the leg plate connecting shaft 207, the second limiting pin is arranged at two outer sides of the top end of the leg plate mounting member 206, and the limiting tension spring 208 is connected between the first limiting pin and the second limiting pin; the limiting stopper 2051 is arranged at two inner sides of one end of the leg plate connecting member 205 close to the leg plate connecting shaft 207; when the leg plate 203 is in a horizontal state, the heights of the first limiting pin and the second limiting pin are both higher than the height of the leg plate connecting shaft 207, and the bottom edge of one end of the leg plate 203 close to the leg plate connecting shaft 207 abuts against the upper end of the limiting stopper 2051. The limiting tension spring 208 tightens the leg plate portion and the leg plate connecting member.

When the power motor drives the connecting rod mechanism to move, the leg plate part rotates around the leg plate connecting shaft 207 to a horizontal state. At this time, under the action of the limit tension spring 208 and the limit block 2051, a stable structure is formed between the leg plate 203 and the leg plate connecting member 205. As the connecting rod mechanism continues to move, the leg plate 203 no longer rotates around the leg plate connecting shaft 205, but rotates around the driving shaft 501 together with the leg plate connecting member 205, thereby realizing the stretching and swinging action of the leg plate 203.

The fitness chair of the present invention has two kinds of movements and three states:

When the power starts to be output, the active connecting rod 601 drives the driven connecting rod 602 to rotate the leg plate part around the leg plate connecting shaft 207, i.e., the pivot shaft, to perform the retracting and extending swinging. The leg plate part swings upward from the vertical state in the static state to the horizontal state, and the corresponding back plate part swings downward from the vertical state to the horizontal state at the same time, and the leg plate part and the leg plate part of the fitness chair are opened to form the state of a bed; and when the leg plate part swings downward from the horizontal state to the vertical state in the static state, the corresponding back plate part swings upward from the horizontal state to the vertical state at the same time, and the fitness chair returns to the seat state. The leg plate part and the back plate part change from vertical to horizontal, and then from horizontal to vertical, forming a retracting and extending swinging action cycle.

When stretching exercise is needed, the power motor outputs power to drive the active connecting rod through the driven connecting rod, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece 205 rotate around the driving shaft and swing upward. When the swing reaches the high position, the reverse power is output, and the driven connecting rod, the leg plate part, and the leg plate connecting piece 205 rotate around the driving shaft and swing downward. Among them, the driven connecting rod, the leg plate part, and the leg plate connecting piece 205 swing upward from the horizontal to the high position of stretching, and then swing downward from the high position of stretching to the horizontal, forming a stretching swing action cycle.

The first state is the seat state, which is the initial state of the fitness chair. In this state, the fitness chair is stationary, no power output, and the leg plate and back plate are in a natural vertical state. This state is the state in which the fitness chair is stored after use, and is also the starting state and ending state of the fitness chair's retractable and swinging.

The second state is a bed state, in which the leg board and the back board are opened, turning from vertical to horizontal, and are in the same horizontal state as the seat board. This state is the end state of the swing from contraction to expansion to the highest point, and is also the starting state of the swing from stretching to the lowest point. It is the turning point between the swing from contraction to expansion and the swing from stretching.

The third state is the high position state of the stretching swing. In this position, the stretching swings upward to a high position and then switches to swing downward.

The walking traction mechanism 3 of this embodiment includes a driving shaft 305, a driven walking wheel 307, a double-groove rope pulley 304, a first pulling rope 303, a second pulling rope 302, and a pulling spring 301; wherein the driving shaft 305 is rotatably connected to the rear side of the frame 1, and the two ends of the driving shaft 305 are connected to the driving walking wheel 306; the front side of the frame 1 is connected to the driven walking wheel 307.

The double-groove rope pulley 304 is set on the driving shaft 305, one end of the first pulling rope 303 is wrapped in one of the rope grooves of the double-groove rope pulley 304, and the other end passes through the guide wheel assembly 308 set at the right end of the frame 1 and is connected to the bottom of the left end of the back plate 201. One end of the second pulling rope 302 is wrapped in another rope groove of the double-groove rope pulley 304, and the other end is wound around the guide wheel assembly 308 in the opposite direction of the action of the first pulling rope 303. One end of the pulling spring 301 is fixedly connected to the rear end of the frame 1, and the other end is connected to the guide wheel assembly 308; when the back plate 201 is in a vertical state, the pulling spring 301 is in a stretched pre-tightened state.

The walking traction mechanism of this embodiment adds a guide wheel assembly 308, so that the guide wheel assembly 308 of the present application is suitable for use in smaller spaces such as fitness chairs. The second pulling rope 302 passes through the guide wheel assembly 308 and can pull the fitness chair away from the placement position with a smaller pull distance.

When the fitness chair is in the storage state, the back plate can be placed against the wall. When the fitness chair needs to be unfolded, the power motor drives the active connecting rod to rotate, and the back plate flips downward under the action of gravity. At this time, the pulling spring contracts under the action of elasticity, and its contraction drives the second pulling rope to move. The second pulling rope pulls the double-groove rope wheel and the active shaft to rotate, and the active shaft drives the active walking wheel to move forward, so that the fitness chair leaves the wall and makes room for the unfolding action of the back plate; at the same time, the rotation action of the double-groove rope wheel causes the first pulling rope to be wound around the double-groove rope wheel in multiple turns;

When the fitness chair needs to be stored, the power motor drives the active connecting rod to rotate in the opposite direction, and the back panel changes from a horizontal state to a vertical state under the action of the active connecting rod. During the swinging process of the back panel, the first pulling rope is pulled out through the double-groove rope pulley, and the first pulling rope pulls the double-groove rope pulley and the active shaft to rotate in the opposite direction. The active shaft drives the active walking wheel to move backward, so that the fitness chair is close to the wall, and the fitness chair is automatically stored and placed; at the same time, the rotation of the double-groove rope pulley will cause the second pulling rope to pull the pulling spring again, so that the pulling spring is in a stretched pre-tightened state again, which is convenient for the fitness chair to perform the next retraction and release action.

The guide wheel assembly 308 includes a front bracket 310 fixed to the front end of the frame 1, a spring connecting plate 311 connected to the pulling spring 301, and a spring seat plate 312 pivoted to the spring connecting plate 311; the spring connecting plate 312 is pivoted with a first guide wheel 313 and a second guide wheel 314 in parallel, and the front bracket 310 is pivoted with a third guide wheel 315 and a fourth guide wheel 316 in parallel, and the fourth guide wheel 316 is a double wheel; the first pulling rope 303 is wound around one of the fourth guide wheels 316 and then The second pulling rope 302 is wound in the rope groove of the double-groove rope wheel 304, one end of which is connected to the front bracket 310, and then is wound around the other one of the second guide wheel 314, the third guide wheel 315, the first guide wheel 313, and the fourth guide wheel 316, and then is wound in the other rope groove of the double-groove rope wheel 304 in the opposite direction of the pulling direction of the first pulling rope; one end of the pulling spring 301 is hung on the spring connecting plate 311, and the other end is hung on the rear bracket 309 and fixedly connected to the rear end of the frame 1 through the rear bracket 309.

The multi-wheel combination structure of the guide wheel assembly 308 is a labor-saving mechanism, which enables the first pulling rope and the second pulling rope to pull the fitness chair to move with less force.

The clutch mechanism 4 is arranged on the driving shaft 305, located on one side of the double groove rope wheel 304; it includes a first coupling member 405, a second coupling member 406, a reset spring 409, and a limit sleeve 408; the double groove rope wheel 304 is rotatably connected to the driving shaft 305 through a bearing, one side of the double groove rope wheel 304 is fixedly connected with a first coupling member 405, and the first coupling member 405 is rotatably sleeved on the outside of the driving shaft 305; a second coupling member 406 is arranged on the side of the first coupling member 405 away from the double groove rope wheel 304, and the second coupling member 406 is sleeved on the outside of the driving shaft 305, and the second coupling member 406 is sleeved on the outside of the driving shaft 305. The second coupling member 406 is key-connected to the driving shaft 305 so that the second coupling member 406 slides along the length direction of the driving shaft 305. A limiting sleeve 408 is provided on the side of the second coupling member 406 away from the first coupling member 405. The limiting sleeve 408 is fixedly connected to the outside of the driving shaft 305. A reset spring 409 is sleeved on the outside of the driving shaft 305 and the reset spring 409 is located between the second coupling member 406 and the limiting sleeve 408. The second coupling member 406 is engaged with the first coupling member 405 under the squeezing action of the reset spring 409. The second coupling member 406 is connected to the frame 1 through the switch assembly.

The switch assembly includes a clutch mounting frame 403, an eccentric wheel 402, a hand crank 401, a movable connecting rod 404, and a clutch sleeve 407. The clutch mounting frame 403 is fixedly connected to the frame body 1, the eccentric wheel 402 is rotatably connected to the clutch mounting frame 403, and the eccentric wheel 402 is fixedly connected to the hand crank 401. The middle part of the movable connecting rod 404 is pivotally connected to the pin shaft of the clutch mounting frame 403, one end of the movable connecting rod 404 abuts against the bottom end of the eccentric wheel 402, and the bottom of the other end of the movable connecting rod 404 is connected to the clutch sleeve 407. The clutch sleeve 407 is sleeved on the outside of the second coupling member 406 and can push the second coupling member 406 to slide in the direction of the limiting sleeve 408.

The eccentric wheel is rotated by the hand crank to squeeze one end of the movable connecting rod, and the other end of the movable connecting rod pushes the second coupling member in the direction away from the first coupling member through the clutch sleeve, and the first coupling member and the second coupling member are in a disconnected state, that is, the power transmission between the double-groove rope pulley and the driving shaft is disconnected. At this time, people can push the fitness chair to move freely; when the double-groove rope pulley needs to be connected to the driving shaft again, it is only necessary to rotate the eccentric wheel in the opposite direction, and the movable connecting rod no longer pushes the clutch sleeve. Under the action of the reset spring, the second coupling member is re-engaged with the first coupling member, and the forward and backward effects of the walking traction mechanism are realized again.

The safety mechanism of the present embodiment 1 includes a photoelectric control mechanism and a first mechanical brake protection mechanism 7 or a second mechanical brake protection mechanism 8. Both the first mechanical brake protection mechanism 7 and the second mechanical brake protection mechanism 8 can be used in the embodiment 1 to provide safety protection for the fitness chair. The first mechanical brake protection mechanism 7 is introduced first, and the second mechanical brake protection mechanism 8 is introduced in the embodiment 2. The photoelectric control mechanism of the present embodiment is the first photoelectric control mechanism.

In this embodiment, the first mechanical brake protection mechanism 7 is arranged outside the power motor 5 and is fixedly connected to the frame 1 through the drum brake support plate 706 .

The first mechanical brake protection mechanism 7 includes a positioning assembly 703 fixedly arranged at the outer end of the driving shaft 501, a positioning plate 701 rotatably sleeved on the outer end of the driving shaft 501, and an electric push rod 702 pivotally connected to the frame 1; the positioning plate 701 is provided with a brake groove and a drum brake component is provided in the brake groove so that the drum brake component brakes the positioning plate 701, and the drum brake component is hinged to the electric push rod 702 to open the brake when the electric push rod 702 applies force;

The positioning plate 701 is provided with a C-shaped regulating groove 7011 on the side opposite to the positioning assembly 703, and the angle formed by the two groove endpoints of the C-shaped regulating groove 7011 and the center of the positioning plate satisfies 90 degrees < angle ≤ 180 degrees. The maximum angle of the C-shaped regulating groove 7011 is set to 180 degrees, even if the maximum swing angle of the positioning assembly 703 is 180 degrees. The positioning assembly 703 has a regulating pin 7031, which is embedded in the C-shaped regulating groove 7011 and rotates; when the drum brake component opens the brake, the positioning assembly 703 causes the regulating pin 7031 to rotate in the C-shaped regulating groove 7011, and the positioning plate 701 does not move, but when it touches the end of the C-shaped regulating groove 7011, it drives the positioning plate 701 to rotate in coordination; when the user stretches the muscle at the maximum angle, the electric push rod 702 extends, so that the drum brake component brakes the positioning plate 701, forming the mechanical brake setting of the first mechanical brake protection mechanism.

The drum brake component includes an elliptical brake sleeve 710 rotatably arranged on the drive shaft 501, a brake plate 705 fixedly arranged on the brake sleeve 701, an upper brake pad 708 and a lower brake pad 709 arranged on the periphery of the brake sleeve 710 and hinged to each other at one end through a limit pin 707, and the upper brake pad 708 and the lower brake pad 708 are provided with a brake spring assembly 712 on the opposite side of the hinged end to provide braking force for the upper brake pad 708 and the lower brake pad 709, and the brake plate 705 is hinged to the electric push rod 702; the limit pin 707 is hinged with a drum brake support plate 706, and the drum brake support plate 706 is fixedly connected to the frame 1.

The brake spring assembly 712 includes an adjustment pin 7122, an adjustment spring 7123 and an adjustment nut 7124. The adjustment pin 7122 is fixed on the upper brake pad 708. The lower brake pad 709 is provided with a groove to allow the adjustment pin 7122 to be embedded. The circumference of the adjustment pin 7122 is provided with an adjustment spring 7124. The upper part of the adjustment pin 7122 is installed with an adjustment nut 7124 to compress the adjustment spring. The braking force of the adjustment spring 7123 on the upper brake pad 708 and the lower brake pad 709 is adjusted by adjusting the upper and lower positions of the adjustment nut 7124.

The positioning assembly 703 includes a positioning plate, and the regulating pin shaft 7031 is arranged on the positioning plate; on the opposite side of the regulating pin shaft 7031, the positioning plate is provided with a positioning pointer 7032 to constitute an extended end of the positioning plate.

The positioning plate 701 is provided with a torsion spring 711 inside the brake groove. One end of the torsion spring 711 is fixedly connected to the upper brake pad 708 or the lower brake pad 709 , and the other end is connected to the reset pin 714 on the positioning plate 701 to provide a restoring force for the positioning plate 701 .

The electric push rod can be used to control the swing of the positioning plate, thereby changing the position of the C-shaped regulating groove. When the positioning component rotates with the drive shaft, the regulating pin will move in the C-shaped regulating groove. When the regulating pin touches the end of the C-shaped regulating groove, the positioning component and the drive shaft can no longer swing, and the drive shaft rotates in the opposite direction. It realizes the maximum rotation range of the drive shaft, thereby controlling the maximum flip angle of the leg board. The maximum flip angle of the leg board can be adjusted through the first mechanical brake protection mechanism, thereby improving the leg training effect of the fitness chair.

The first photoelectric control mechanism comprises:

The first photoelectric switch sensor 901 is fixedly arranged on the periphery of the positioning plate 701 on one side; when the positioning pointer 7032 blocks the first photoelectric switch sensor 901, a reverse signal is sent to make the driven connecting rod, the leg plate part, and the leg plate connecting member cooperate to swing upward in the opposite direction;

The second photoelectric switch sensor 902 is fixedly arranged on the periphery of another positioning plate 701; during the stretching swing, if no reversal signal is issued when the positioning pointer 7032 blocks the first photoelectric switch sensor 901, a reversal signal is issued when the positioning pointer 7032 blocks the second photoelectric switch sensor 903, causing the drive shaft to swing downward in the opposite direction.

It should be noted that the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 can be set on one positioning plate 701 as shown in Figure 8, or be set on two positioning plates 701 respectively. Figure 8 shows that the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 are set on one positioning plate 701, which is relatively compact in space. However, from another perspective, it appears simpler if the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 are installed on different positioning plates.

Although the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 are installed on different positioning plates, their spatial positions are the same as those set on one positioning plate, that is, the positioning pointer 7032 will first block the first photoelectric switch sensor 901 during the upward swing process, and will block the first photoelectric switch sensor 902 when the first photoelectric switch sensor 901 fails. When the first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 fail at the same time, the regulating pin 7031 touches the upper top of the C-shaped regulating groove 7011 of the positioning plate 701 and is mechanically braked by the first mechanical brake protection mechanism.

The third photoelectric switch sensor 904 is arranged on the frame, and the first shielding piece 903 is arranged on the leg plate connecting member 205; during the stretching swing, when the leg plate connecting member 205 swings down to shield the third photoelectric switch sensor 904, a reversal signal is sent out, so that the leg plate part and the leg plate connecting member 205 cooperate to swing upward in the opposite direction;

When the driving shaft drives the leg board to flip to the highest position and then rotates in the opposite direction by a certain angle, the first shielding piece 903 will block the third photoelectric switch sensor 904. After receiving the signal from the third photoelectric switch sensor 904, the controller will drive the driving shaft to rotate in the opposite direction again, thereby driving the leg board to flip upward, thereby realizing the reciprocating stretching and swinging action of the leg board.

The fourth photoelectric switch sensor 905 is arranged on the frame, and the second shielding piece 906 is arranged on the inner side of the leg board mounting member 206; during the retraction and extension swing, the leg board part swings down, and its leg board mounting member 206 swings down, and the second shielding piece 906 blocks the fourth photoelectric switch sensor 905, and a braking signal is sent out to stop the retraction and extension swing, and the controller stops the power motor 5 from rotating, and the fitness chair returns to a static state.

When the fitness chair is stored in a folded state, the backboard and the legboard are in a vertical state. At this time, the second shielding member shields the fourth photoelectric switch sensor. After receiving the signal, the controller stops the power motor and keeps the fitness chair in the folded state.

The first photoelectric switch sensor 901 and the second photoelectric switch sensor 902 output control signals when blocked by the positioning pointer 7032 ; the third photoelectric switch sensor 904 and the fourth photoelectric switch sensor 905 output control signals when blocked by the first blocking piece 903 and the second blocking piece 906 at a low position.

The control of the reciprocating stretching and swinging action is controlled by the first photoelectric switch sensor 901, the second photoelectric switch sensor 902 and the third photoelectric switch sensor 904. The first photoelectric switch sensor is arranged at the front side of the second photoelectric switch sensor, so that the leg plate part swings in the reverse direction downward when the stretching and swinging upward reaches the detection position of the first photoelectric switch sensor; the third photoelectric switch sensor 904 outputs a control signal when the first shielding sheet 903 blocks it, so that the leg plate part swings in the reverse direction upward when it swings downward to the detection position of the third photoelectric switch sensor.

The second photoelectric switch sensor 902 is arranged on the opposite side of the mechanical brake limit position so that the brake signal sent by the second photoelectric switch sensor precedes the mechanical brake, and sends a brake signal when the positioning pointer 7032 is blocked by the upward swing. The fourth photoelectric switch sensor 905 sends a reverse signal when the second shielding piece 906 is blocked, so that the drive shaft swings downward in the opposite direction.

The above-mentioned safety mechanism of the present application realizes triple protection when in high position, the first is the reverse swing control protection of the first photoelectric switch sensor 901, the second is the braking protection of the second photoelectric switch sensor 902 in the event of control failure of the first photoelectric switch sensor 901, and the third is the mechanical braking protection of the first mechanical braking protection mechanism 7 or the second mechanical braking protection mechanism 8 in the event of braking protection failure of the second photoelectric switch sensor.

Example 2

As shown in FIGS. 17-24 , similar to the first embodiment, the second embodiment provides a fitness chair, including:

The frame 1 includes a horizontally fixed seat plate 101;

A power source fixed on the frame 1 for outputting power,

An active mechanism that completes the retracting and releasing swing and the stretching swing under the drive of a power source, a walking mechanism that moves the frame 1 under the drive of a power source, and a safety mechanism that provides triple protection for the user during the stretching swing;

The walking mechanism includes a walking traction mechanism 3 for driving the frame 1 to move, and a clutch mechanism 4 for separating and engaging the walking traction mechanism 3 and the frame 1;

The safety mechanism includes a photoelectric control mechanism and a mechanical brake protection mechanism; the photoelectric control mechanism includes a first photoelectric control mechanism or a second photoelectric control mechanism, and the corresponding mechanical brake protection mechanism is a first mechanical brake protection mechanism 7 or a second mechanical brake protection mechanism 8.

The frame body 1 includes a seat plate 101, a bottom frame 102, side frames 103 arranged on both sides of the bottom frame 102, and a seat plate support frame 104 located between the two side frames 103; the bottom frame 102, the side frames 103, and the seat plate support frame 104 are frame structures, and the side frames 103 are arranged vertically; the seat plate 101 is fixed on the seat plate support frame 104 and is located between the two side frames 103; a motor fixing plate 105 is arranged on the inner side of the side frame 103, which can be used to fix and support the power source; The upper side, front side, rear side and outer side can be covered with a protective plate 106, so that the power source is covered in the surrounding structure formed by the protective plate 106. The frame 1 is provided with a back plate support plate 107 at the rear to support the back plate part when the back plate part swings downward to a horizontal position.

It can be seen from the drawings in the specification that the frame 1 of Example 2 is slightly different from the frame 1 of Example 1. For example, in Example 1, the protective plate 106 behind the side frame 103, the protective plate 106 in front of the side frame 103 and the protective plate 106 at the top of the side frame 103 are at the same height, without a height difference. In Example 2, the protective plate 106 behind the side frame 103 is lower than the height of the protective plate 106 in front of the side frame 103 and the protective plate 106 at the side frame 103, with a height difference. Compared with the two, the height of the protective plate of the fitness chair in Example 1 is consistent, so the fitness chair has a beautiful appearance and is simpler to install and manufacture; when the user of the fitness chair in Example 2 stretches, the arms do not need to be raised to a very high position, which is more comfortable.

Of course, there are other differences between the frame 1 of Example 2 and Example 1, such as slightly different positions and quantities of components, but the functions are the same, both of which are basic components of the fitness chair of the present invention, used to install a fixed power source, a movable mechanism, a walking mechanism, and a safety mechanism.

The power source is the same as the power source of Example 1, which is a power motor 5 with a built-in reducer. The power motor 5 has a drive shaft 501. There are two power motors 5, which are respectively located in the enclosing structure of the two side frames 103 and fixedly connected to the motor fixing plate 105. The drive shaft 501 extends from the opening of the motor fixing plate 105 toward the center position of the seat plate 101.

Functionally speaking, the drive shaft 501 is suitable for the fitness chair of the present application whether it is a single output shaft or a dual output shaft. However, based on installation considerations, the power motor 5 selected in the present application is a dual output shaft, that is, the output shaft of the power motor 5 has two output ends, so that the safety mechanism and the movable mechanism can be installed on the output shaft at different output ends respectively, avoiding the safety mechanism and the movable mechanism being densely installed on one end of the output shaft.

The drive shaft 501 is a dual output shaft. The number of power motors 5 is two, which are respectively located in the frame structure of the two side frames 103 and fixedly connected to the motor fixing plate 105. One output end of the drive shaft 501 extends from the opening of the motor fixing plate 105 and faces the center position of the seat plate 101 for installing the movable mechanism. The other output end extends away from it but is located in the surrounding structure of the side frame 103 for installing the safety mechanism.

Similar to the first embodiment, the movable mechanism of the second embodiment includes a back plate portion, a leg plate portion, a connecting rod mechanism 6, and a leg plate connecting member 205;

In this embodiment, the back plate portion is composed of a back plate 201 and guide plates 2011 arranged on both sides of the lower rear portion of the back plate 201. The back plate 201 is pivotally connected to the rear portion of the frame 1, and the guide plate 2011 is an arc plate. The arc plate is a steel plate, one side of which is bolted to the back plate 201, and the other side is an arc track.

In this embodiment, the connecting rod mechanism 6 includes an active connecting rod 601 fixedly connected to the driving shaft 501 for transmitting the rotation of the driving shaft 501 outward, and a driven connecting rod 602 pivotally connected to the active connecting rod 601 through a pivot pin 6015 .

An axle pin 6013 is provided at the rear of the active connecting rod 601, and a bearing 6014 is installed on the axle pin 6013. The bearing 6014 and the arc track of the guide plate 2011 are in sliding contact when the fitness chair is folded, extended or swung.

The guide plate 2011 is designed as an arc plate. When the fitness chair is folded and swung, the active connecting rod 601 slides in contact with the arc track of the guide plate 2011 through the axle pin 6013, so that the bearing 6014 on the axle pin 6013 swings along the arc track when the fitness chair is folded and swung, thereby ensuring the synchronous swing of the leg plate and the back plate. During the stretching swing, the axle pin 6013 disengages from the guide plate 2011.

The leg plate portion includes a leg plate 203 and a leg plate mounting member 206 fixed to both sides of the leg plate 203. The leg plate mounting member 206 is pivotally connected to a pin at one end of the driven connecting rod 602, and the leg plate 203 is pivotally connected to the driven connecting rod 602 through the leg plate mounting member 206. There is power transmission between the leg plate mounting member 206 and the connecting rod mechanism 6 and the leg plate 203, and the power of the driving shaft 501 is transmitted to the leg plate 203 by the connecting rod mechanism 6 and the leg plate mounting member 206.

The leg board 203 is located on the front side of the seat board 101, and leg board connecting shafts 207 (pivot shafts) are provided on both sides of one end of the leg board 203 close to the seat board 101 and are pivotally connected to one end pin of the leg board connecting member 205 through the leg board connecting shaft 207. The other end of the leg board connecting member 205 is rotatably connected to the driving shaft 501. The leg board 203 and the leg board mounting member 206 constitute the leg board part. In fact, the leg board part can also be an integrated component composed of the leg board 203 and the leg board mounting member 206. The split component composed of the leg board 203 and the leg board mounting member 206 here is made for the convenience of installation and maintenance.

A limit assembly is provided between the leg plate mounting member 206 and the leg plate connecting member 205, and the limit assembly includes a limit tension spring 208, a first limit pin, and a second limit pin. The first limit pin is provided at the outer side of one end of the leg plate connecting member 205 close to the leg plate connecting shaft 207, and the second limit pin is provided at the top of the leg plate mounting member 206. The limit tension spring 208 is connected between the first limit pin and the second limit pin.

The other end of the active connecting rod 601 is provided with an axle pin 6013 and is matched with the arc track of the guide plate 2011 arranged at the rear of the back plate mounting member 204 through the bearing 6014 on the gear pin axle pin 6013; when the back plate 201 is in a vertical state, the bearing 6014 is located on the arc track of the guide plate 2011; when the back plate 201 is transformed into a horizontal state, the active connecting rod 601 drives the axle pin 6013 to rotate downward, and the back plate 201 rotates downward and gradually transforms into a horizontal state; when the back plate 201 is in a horizontal state, the back plate 201 is placed on the frame 1, and the axle pin 6013 swings with the active connecting rod 601 and escapes from the arc track;

The second limit block 604 is arranged inside the middle of the driven connecting rod 602; when the leg board 203 is in a horizontal state, the second limit block 604 of the driven connecting rod 602 contacts the lower bottom surface of the leg board connecting member 205, and the fitness chair enters the stretching swing state, and the driven connecting rod 602 no longer applies force to the leg board 203 alone. The active connecting rod 601 pushes the driven connecting rod 602, the leg plate mounting member 206, the leg plate 203, and the leg plate connecting member 205 to cooperate and perform stretching and swinging. At this time, the active connecting rod 601 and the driven connecting rod 602 do not move relative to each other.

For safety reasons during the retracted and extended swing and the stretching swing and to prevent the user's clothes from being squeezed in, a protective cover 603 with an opening at the lower end is provided on the periphery of the driven connecting rod 602. The protective cover 603 forms a semi-enclosed structure with an opening at the lower end, and covers the driven connecting rod 602 and the leg plate connector 205 in the semi-enclosed structure of the protective cover.

It can be seen from the figure that the back plate of this embodiment is different from that of the back plate of embodiment 1, and the pivotal position of the active connecting rod 601 and the back plate and the movement mode thereof are also changed. The shapes of the active connecting rod 601 and the driven connecting rod 602 are different, and the pivotal position between the active connecting rod 601 and the driven connecting rod 602 is also changed, but the power transmission of the active connecting rod 601 and the driven connecting rod 602 remains unchanged.

After the guide plate 2011 is provided on the back plate 201, the back plate portion and the leg plate portion of the present embodiment swing synchronously in opposite directions during the retraction and extension swinging, and the swing consistency and uniformity of the back plate portion and the leg plate portion are better.

The walking traction mechanism 3 and its clutch mechanism 4 in this embodiment have basically the same structural composition as those in Example 1, and are both arranged between the front end and the rear end of the frame. The slight difference is that one end of the first pulling rope is fixedly connected to the guide plate 2011, which is adapted to the structural change of the back plate part of this embodiment, but it can also be arranged at the rear position of the back plate as in Example 1, and no further description of the above structure will be given here.

The safety mechanism of this embodiment includes a photoelectric control mechanism and a first mechanical brake protection mechanism 7 or a second mechanical brake protection mechanism 8. Both the first mechanical brake protection mechanism 7 and the second mechanical brake protection mechanism 8 can be used in Example 2 to provide safety protection for the fitness chair. The first mechanical brake protection mechanism 8 is introduced here to match it. The photoelectric control mechanism of this embodiment is the second photoelectric control mechanism.

In this embodiment, the second mechanical brake protection mechanism 8 includes:

The electric cylinder 801 is used to output the power of safety braking at the high point and low point of the swing of the tendon;

A positioning wheel, rotatably disposed at the outer end of the driving shaft 501, wherein the inner side of the positioning wheel is provided with a C-shaped regulating groove 807;

The support plate 803 is fixedly mounted on the frame 1;

Two brake rods 804 are arranged on both sides of the periphery of the positioning wheel disc and are pivotally connected to one side of the support plate 803 through a support shaft; the lower ends of the two brake rods 804 are hinged to the head and tail of the electric cylinder 801, and when the electric cylinder 801 is extended and retracted, the brake rods 804 swing open and close with the support shaft as the center, so that the front ends of the brake rods 804 are engaged with or disengaged from the positioning wheel disc, and the brake is applied when engaged, and the brake is released when disengaged;

The positioning arm 806 is mounted on the driving shaft 501. The positioning arm 806 is provided with a positioning shaft 811 which is embedded in the C-shaped regulating groove 807 and moves with the positioning arm 806.

The driving shaft 501 drives the positioning shaft 811 to rotate through the positioning arm 806, and drives the positioning wheel to rotate cooperatively when touching the end of the C-shaped regulating groove 807. When the user stretches the muscles to the maximum angle, the electric cylinder 801 applies force, and the brake rod 804 engages with the positioning wheel to brake the positioning wheel, completing the mechanical brake setting of the second mechanical brake protection mechanism.

In order to simplify the structure, provide better braking force and improve the braking effect, the positioning wheel of this embodiment is a positioning gear 802, and the corresponding brake rod 804 is a brake arm, and the front end of the brake arm is inlaid with a rack 805, which is engaged with the positioning gear 802 during braking. The cooperation of the rack 805 and the positioning gear 802 can provide a larger braking force with a smaller structure, so that the second mechanical brake protection mechanism 8 of this embodiment is more simplified and compatible with the structure of the fitness chair.

A rope sheave is disposed outside the positioning gear 802 and connected to a reset wire rope 808 through the rope sheave. The reset wire rope 808 is connected to a cylindrical thread tension spring 809 after passing through the steering wheel assembly. The other end of the cylindrical thread tension spring 809 is fixedly connected to the frame. The steering wheel assembly includes a steering shaft and a steering wheel 810 rotatably disposed on the steering shaft. The steering shaft is fixedly connected to the frame.

The second photoelectric control mechanism of this embodiment includes:

The fifth photoelectric switch sensor 907 is arranged at the top of the front side of the frame; the third shielding piece 908 is arranged at the rear of the leg plate; during the retracting and extending swinging, the leg plate swings from horizontal to vertical, and the third shielding piece 908 shields the fifth photoelectric switch sensor 907, and a braking signal is sent to stop the retracting and extending swinging;

The sixth photoelectric switch sensor 909 is arranged at the top of the middle part of the frame; when the protective cover 603 or the driven connecting rod 602 blocks the sixth photoelectric switch sensor 909 during the swing of the stretching rod, a reverse signal is sent out, so that the driven connecting rod, the leg plate part, and the leg plate connecting member cooperate to swing upward in the opposite direction;

The seventh photoelectric switch sensor 910 is arranged on a positioning wheel; when the tensioning rod swings to the high position, the positioning arm 806 first blocks the seventh photoelectric switch sensor 910 and sends a reverse signal, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction;

The eighth photoelectric switch sensor is arranged on the positioning wheel on the other side and is spatially offset from the seventh photoelectric switch sensor; when the tensioning rod swings to the high position, if the seventh photoelectric switch sensor 910 fails and does not send a reversal signal, the corresponding positioning arm 806 blocks the eighth photoelectric switch sensor and sends a reversal signal before the mechanical brake, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction.

The fitness chair of this embodiment, through the combination of an electric cylinder, a positioning gear, a C-shaped regulating groove, two brake rods, two racks, two photoelectric switch sensors (the seventh photoelectric switch sensor and the eighth photoelectric switch sensor), a positioning arm, and a positioning shaft, can set the reversing position of the highest point of the stretching swing and the safe braking position of the maximum stretching angle, thereby achieving triple protection to ensure the safe use of the fitness chair.

The positions of the seventh photoelectric switch sensor and the eighth photoelectric switch sensor are both before the mechanical brake position of the second mechanical brake protection mechanism 8. The seventh photoelectric switch sensor is at the first shielding position during the rotation of the positioning gear, and is a high point reversing switch for the swing of the tie rod. The swing of the tie rod changes direction after reaching the high point of the swing at this position. The eighth photoelectric switch sensor is located between the seventh photoelectric switch sensor and the mechanical brake position, and is a high point reversing switch for the swing of the tie rod. It sends a reversing signal when the seventh photoelectric switch sensor fails and the drive shaft swings upward again.

The second mechanical brake protection mechanism 8 is the final safety guarantee of the fitness chair of this embodiment, and is a safety brake guarantee in the case that the two photoelectric switch sensors (the seventh photoelectric switch sensor and the eighth photoelectric switch sensor) may all fail.

The specific setting is that the two brake levers are opened, the rack of the brake lever is disengaged from the positioning gear, and the positioning shaft on the positioning arm swings in the C-shaped adjustment groove as the drive shaft swings, and when it touches the end point of the C-shaped adjustment groove, it drives the positioning gear to swing. At the maximum tensioning angle that the user can bear, the two brake levers are closed towards each other, and the rack of the brake lever is meshed with the positioning gear to brake the drive shaft, thereby setting the mechanical brake position. After the angle setting is completed, the two brake levers are released, the braking force disappears, the reset wire rope pulls the positioning gear to reset, and then the drive shaft resets.

The above-mentioned safety mechanism of this embodiment realizes triple protection when in high position, the first is the reverse swing control protection of the seventh photoelectric switch sensor 910, the second is the reverse swing control protection of the eighth photoelectric switch sensor in the event of control failure of the seventh photoelectric switch sensor 910, and the third is the mechanical braking protection of the second mechanical brake protection mechanism 8 in the event of reverse swing control failure of the seventh photoelectric switch sensor 91 and the eighth photoelectric switch sensor.

In the specific setting, the reverse swing control protection of the seventh photoelectric switch sensor 910 has a failure reminder. At this time, the reverse swing control protection is completed by the eighth photoelectric switch sensor. At the same time, the reminder setting can remind the user to replace the seventh photoelectric switch sensor 910 in time, but this setting is not the protection focus of this application and is not described in detail here.

The second mechanical brake protection mechanism 8 is a brake protection when the reverse swing control protections of the seventh photoelectric switch sensor 910 and the eighth photoelectric switch sensor fail at the same time. It has a high safety level and is also the most reliable protection.

Compared with the first mechanical brake protection mechanism 7 of embodiment 1, the second mechanical brake protection mechanism 8 of this embodiment has a simpler structure and is simpler to operate, but has the same function, that is, to achieve upper reversal and safety braking when the fitness chair is stretched and swung. Since the angle formed by the two end points of the C-shaped regulating groove and the center of the positioning plate satisfies 90 degrees < angle ≤ 180 degrees, during the stretching and swinging process, the positioning shaft will not touch the end points of the C-shaped regulating groove and will swing back and forth within the range defined by the C-shaped regulating groove.

It should be noted that the first mechanical brake protection mechanism 7 and the second mechanical brake protection mechanism 8 of Example 1 can be interchangeable, and the corresponding first photoelectric control mechanism and second photoelectric control mechanism are replaced accordingly, and their installation positions change with the changes of the first mechanical brake protection mechanism 7 and the second mechanical brake protection mechanism 8.

As shown in FIG. 25 , the working method of the fitness chair of the above-mentioned embodiments 1 and 2 is as follows:

S1, the fitness chair is stationary, in the seat state, the clutch mechanism is in the engaged state, the traction spring in the walking traction mechanism is in the stretched state, and the traction spring stores energy;

S2, the person sits on the fitness chair and sets the number of stretching times on the fitness chair through the controller;

S3, click the power start button, the power motor is powered, the drive shaft drives the active connecting rod to swing, and the driven connecting rod pushes the leg plate to swing upward from vertical; at the same time, with the swing of the active connecting rod, the back plate loses support, the energy stored in the pulling spring is released, the second pulling rope pulls the double-groove rope wheel to rotate, and the fitness chair moves forward, so that the fitness chair changes from a seat state to a bed state; when the leg plate reaches a horizontal position, it touches the photoelectric switch sensor of the first photoelectric control mechanism or the second photoelectric control mechanism, turns off the power motor, and stops swinging;

S4, maximum swing angle setting: after lying flat, the user pushes the handle switch downward, the power motor drives the active connecting rod to continue rotating, and pushes the driven connecting rod, the leg board connector, and the leg board part to swing upward in coordination; when the swing reaches the maximum angle that the user can bear, the handle switch is immediately released, the power motor stops moving, the confirmation button on the handle switch is clicked, the positioning plate or the positioning wheel is locked, and the maximum swing angle setting is completed; that is, the first mechanical brake protection mechanism or the second mechanical brake protection mechanism completes the mechanical brake setting of the maximum angle;

S5. After locking the positioning plate or positioning wheel, the power motor reverses and the leg plate swings downward. When it reaches the horizontal position, the photoelectric switch issues a command, the power motor reverses and the leg plate swings upward. This is repeated until the set number of stretching times is completed and the leg plate is at the maximum angle. The photoelectric switch issues a command, the power motor stops rotating, and the electric push rod shortens to disengage the drum brake component from the brake disc, or the electric cylinder is actuated to disengage the brake rod from the positioning gear.

S6, the positioning disc or positioning wheel releases the brake, the power motor reverses, the driven connecting rod, the leg plate connecting piece, and the leg plate part cooperate to swing down, and the swing The power motor continues to rotate, so that the leg plate and the back plate become the seat state position, and the fitness chair moves backward to the initial position, and the positioning plate rotates back to the initial position with the regulating pin shaft or the positioning wheel with the positioning shaft; the pulling spring returns to the stretched state to store energy; the stretching of the fitness chair is completed;

S7. If the fitness chair needs to be pushed, disconnect the clutch mechanism to disengage the clutch mechanism from the walking traction mechanism.

By analogy with Example 1 and Example 2, after removing the connecting rod mechanism 6, the leg board connector 205, the seat board 101 and the simplified photoelectric control mechanism, the present application can provide two swing angle limiting braking protection mechanisms, which can be used alone in a rotating device that needs to limit the rotation angle, thus producing the swing angle limiting braking protection mechanism of Example 3 and the swing angle limiting braking protection mechanism of Example 4.

Embodiment 3:

As can be seen from Figures 1-4 and 7-11, the swing angle limiting braking protection mechanism of this embodiment includes a power motor 5, a positioning assembly 703, a positioning plate 701, and an electric push rod 702, wherein the power motor 5 is arranged on the frame 1 to output swing power (the specific structure of the frame 1 can change accordingly with the change of the use scenario of the swing angle limiting braking protection mechanism); the positioning assembly 703 is fixedly arranged on the driving shaft 501 of the power motor 5, the positioning plate 701 is rotatably sleeved on the driving shaft 501, and the electric push rod 702 is pivotally connected to the frame 1; the power motors 5 are two, and the corresponding positioning assemblies, positioning plates 701, and electric push rods 702 are two sets;

The positioning disc 701 is provided with a brake groove, and a drum brake component is provided in the brake groove, so that the drum brake component brakes the positioning disc; the drum brake component is hinged with the electric push rod 702, and the brake on the positioning disc 701 is released when the electric push rod 702 is shortened; a C-shaped regulating groove 7011 is opened on one side of the positioning component of the positioning disc 701, and the positioning component has a regulating pin shaft 7031, and the regulating pin shaft 7031 is embedded in the C-shaped regulating groove 7011 and rotates;

The electric push rod 702 shortens to release the brake of the drum brake component on the positioning plate 701, and the drive shaft 501 drives the regulating pin 7031 to rotate through the positioning assembly, and when it touches the end of the C-shaped regulating groove 7031, it drives the positioning plate 701 to rotate in coordination; when the electric push rod 702 extends, the drum brake component expands, mechanically brakes the positioning plate 701, and sets the maximum swing angle of the drive shaft 501.

The drum brake component includes a brake sleeve 710, a brake plate 705, an upper brake pad 708 and a lower brake pad 709; the brake sleeve 710 has an elliptical outer periphery and is rotatably arranged on the drive shaft 501, the brake plate 705 is fixedly arranged on the brake sleeve 710, the upper brake pad 708 and the lower brake pad 709 are arranged on the periphery of the brake sleeve 710 and one end is hinged to each other through a limit pin 707;

The upper brake pad 708 and the lower brake pad 709 are provided with a brake spring assembly 712 on the opposite side of the hinged end to provide braking force for the upper brake pad 708 and the lower brake pad 709. The brake plate 705 is hinged to the electric push rod 702; the limit pin shaft 707 is hinged with a drum brake support plate 706, and the drum brake support plate 706 is fixedly connected to the frame 1.

The brake spring assembly 712 includes an adjustment pin 7122, an adjustment spring 7123 and an adjustment nut 7124. The adjustment pin 7122 is fixed on the upper brake pad 708. The lower brake pad 709 is provided with a groove to allow the adjustment pin 7122 to be embedded. The circumference of the adjustment pin 7122 is provided with an adjustment spring 7124. The upper part of the adjustment pin 7122 is installed with an adjustment nut 7124 to compress the adjustment spring. The braking force of the adjustment spring 7123 on the upper brake pad 708 and the lower brake pad 709 is adjusted by adjusting the upper and lower positions of the adjustment nut 7124.

The positioning assembly 703 includes a positioning plate, and the regulating pin shaft 7031 is arranged on the positioning plate; on the opposite side of the regulating pin shaft 7031, the positioning plate is provided with a positioning pointer 7032 to constitute an extended end of the positioning plate.

The positioning plate 701 is provided with a torsion spring 711 inside the brake groove. One end of the torsion spring 711 is fixedly connected to the upper brake pad 708 or the lower brake pad 709 , and the other end is connected to the reset pin 714 on the positioning plate 701 to provide a restoring force for the positioning plate 701 .

A first photoelectric switch sensor 901 is fixedly arranged on the periphery of a positioning plate 701. When the driving shaft 501 swings upward to a high position, the positioning component first blocks the first photoelectric switch sensor 901 and sends a reverse signal to make the driving shaft 501 swing downward in the opposite direction.

A second photoelectric switch sensor 902 is fixedly provided on the periphery of the other positioning plate 701. When the driving shaft 501 swings upward, if the positioning component blocks the first photoelectric switch sensor 901 without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor 902 and sends a reversal signal before the mechanical brake, causing the driving shaft to swing downward in the opposite direction.

Embodiment 4:

As can be seen from Figures 18, 20-23, the swing angle limiting brake protection mechanism of this embodiment includes a power motor 5, an electric cylinder 801, a positioning wheel disc, a support plate 803, a positioning arm 806, and two brake rods 804; wherein the power motor 5 is arranged on the frame 1, and has a drive shaft 501 to output swing power; the electric cylinder 801 is used to output a safety braking force at the high point of the swing; the positioning wheel disc is rotatably arranged at the outer end of the drive shaft 501, and the positioning wheel disc is provided with a C-shaped regulating groove 807 on the inner side; the support plate 803 is fixedly arranged on the frame 1 The two brake rods 804 are respectively arranged on both sides of the periphery of the positioning wheel disc and are pivotally connected to one side of the support plate 803 through a support shaft; the lower ends of the two brake rods 804 are hinged to the head and tail of the electric cylinder 801, and when the electric cylinder 801 is telescopic, it swings open and closed with the support shaft as the center, so that the front end of the brake rod 804 is engaged with or disengaged from the positioning wheel disc, and the brake is applied when engaged, and the brake is released when disengaged; the positioning arm 806 is fixedly installed on the driving shaft 501, and the positioning arm 806 is provided with a positioning shaft 811, which is embedded in the C-shaped regulating groove 807 and moves with the positioning arm 806 Movement; the angle formed by the two end points of the C-shaped regulating groove 807 and the center of the positioning wheel satisfies 90 degrees < angle ≤ 180 degrees.

The driving shaft 501 drives the positioning shaft 811 to rotate through the positioning arm, and drives the positioning wheel to rotate in coordination when touching the end of the C-shaped regulating groove 807; the electric cylinder 801 applies force, the brake rod 804 engages with the positioning wheel, brakes the positioning wheel, and sets the maximum swing angle of the driving shaft.

A rope sheave is disposed outside the positioning gear 802 and connected to a reset wire rope 808 through the rope sheave. The reset wire rope 808 is connected to a cylindrical threaded tension spring 809 after passing through the steering wheel assembly. The other end of the cylindrical threaded tension spring 809 is fixedly connected to the frame. The steering wheel assembly includes a steering shaft and a steering wheel 810 rotatably disposed on the steering shaft. The steering shaft is fixedly connected to the frame 1.

There are two power motors 5, and two sets of corresponding electric cylinders 801, positioning wheels, and positioning arms 806; a seventh photoelectric switch sensor 910 is arranged on one positioning wheel, and when the drive shaft 501 swings upward to a high position, the positioning arm 806 first blocks the seventh photoelectric switch sensor 910 and sends a reversal signal to make the drive shaft 501 swing downward in the opposite direction; an eighth photoelectric switch sensor is arranged on the other positioning wheel, which is spatially misaligned with the seventh photoelectric switch sensor 910; when the drive shaft 501 swings upward to a high position, if the seventh photoelectric switch sensor 910 fails and does not send a reversal signal, the corresponding positioning arm 806 blocks the eighth photoelectric switch sensor, sends a reversal signal before the mechanical brake, and makes the drive shaft 501 swing downward in the opposite direction;

The positioning wheel in this embodiment is the positioning gear 802, and the corresponding brake rod 804 is a brake arm. A rack 805 is embedded in the front end of the brake arm to mesh with the positioning gear 802 during braking.

Claims (41)

A fitness chair, characterized in that: A frame, the frame comprising a seat for a user to sit or lie on; and A power source, fixed on the frame, having a drive shaft for outputting power; and An active mechanism that completes the retracting and extending swing and the stretching and swinging under the drive of a power source; The movable mechanism comprises a leg plate portion, a connecting rod mechanism, and a leg plate connecting member pivotally connected to the driving shaft; The leg plate portion is pivotally connected to the leg plate connecting member through a pivot shaft and is located in front of the seat plate; The connecting rod mechanism includes an active connecting rod fixedly connected to the driving shaft and used to transmit the rotation of the driving shaft outward, and a driven connecting rod pivotally connected to the active connecting rod through a pivot pin, and the driven connecting rod swings under the drive of the active connecting rod; The driven connecting rod is pivotally connected to the leg plate portion, and drives the leg plate portion to retract and swing around the pivot axis, so that the leg plate portion moves from vertical to horizontal or/and from horizontal to vertical; The active connecting rod drives the driven connecting rod, the leg plate connecting piece and the leg plate part to swing in coordination with the tensioning rod around the driving shaft, so that the driven connecting rod, the leg plate connecting piece and the leg plate part move from the horizontal position to the high position and then from the high position to the horizontal position. The fitness chair as claimed in claim 1 is characterized in that: the power source is a power motor, the drive shaft is the output shaft of the power motor, and the output shaft is higher than the seat plate. The fitness chair as described in claim 2 is characterized in that: the frame includes side frames located on the left and right sides of the seat plate, and the side frames are frame structures; there are two power motors, and the two power motors are respectively fixed on two side frames; the drive shaft extends horizontally from the side frame to the inside, and the active connecting rod and the leg plate connecting piece are installed on the drive shaft and are located on the inside of the side frame. The fitness chair as claimed in claim 1 is characterized in that: the leg board portion includes a leg board and leg board mounting members fixed on both sides of the leg board, and the leg board is pivotally connected to the driven connecting rod through the leg board mounting members. The fitness chair as described in claim 1 is characterized in that: the movable mechanism includes a first back panel portion; the first back panel portion is composed of a back panel and guide plates on both sides of the lower rear portion of the back panel, the back panel portion is pivotally connected to the rear portion of the frame through the guide plate, the guide plate is an arc plate, and the arc plate has an arc track; the rear portion of the active connecting rod is provided with an axle pin with a bearing, when the active connecting rod is retracted and swung, the active connecting rod slides in contact with the arc track of the guide plate through the axle pin, and when the tendon is stretched and swung, the axle pin is disengaged from the guide plate. The fitness chair as described in claim 5 is characterized in that: a second limit block is arranged on the inner side of the middle part of the driven connecting rod, and when the second limit block contacts the lower bottom surface of the leg board connecting member, the relative movement between the driven connecting rod and the leg board connecting member is limited; in the retraction and extension swing, the second limit block does not touch the leg board connecting member, and the active connecting rod applies force to the leg board part through the driven connecting rod, so that the leg board part changes from vertical to horizontal or from horizontal to vertical; in the stretching swing, the second limit block touches the leg board connecting member, and the active connecting rod applies force to the driven connecting rod, the leg board part, and the leg board connecting member, so that the driven connecting rod, the leg board part, and the leg board connecting member change from horizontal to high position or from high position to horizontal. The fitness chair as described in claim 5 is characterized in that a protective cover with an opening at the lower end is provided on the outer periphery of the driven connecting rod to cover the driven connecting rod and the leg plate connecting piece. The fitness chair as described in claim 1 is characterized in that: the movable mechanism includes a second back panel portion; the second back panel portion includes a back panel and back panel mounting members located on both sides below the back panel, and the second back panel portion is pivotally connected to the drive shaft through the back panel mounting members; a shift pin is provided at the rear portion of the active connecting rod, and when the fitness chair is retracted, extended or swung, the active connecting rod slides in contact with the bottom surface of the back panel mounting member through the shift pin. The fitness chair as described in claim 8 is characterized in that: a shift groove is provided at the lower part of the back panel mounting piece; and the shift pin is in high-pair contact with the top surface of the shift groove. The fitness chair as described in claim 8 is characterized in that: a first limit block is provided at the far end of the active connecting rod, and when the first limit block contacts the lower bottom surface of the driven connecting rod, the relative movement of the active connecting rod and the driven connecting rod is limited; in the retraction and extension swing, the first limit block does not touch the driven connecting rod, and the active connecting rod applies force to the leg plate part through the driven connecting rod, so that the leg plate part changes from vertical to horizontal or from horizontal to vertical; in the stretching swing, the first limit block touches the driven connecting rod, and the active connecting rod applies force to the driven connecting rod, the leg plate part, and the leg plate connecting piece, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece change from horizontal to high position or from high position to horizontal. The fitness chair as claimed in claim 5 is characterized in that a limit assembly is provided between the leg board mounting member and the leg board connecting member; the limit assembly comprises: A limit stopper is arranged at the lower inner side of the front part of the leg plate connecting member to limit the upward swing of the leg plate when the leg plate is swung to the horizontal position; The leg plate connecting member is provided with a first limit pin on the outer side of one end close to the leg plate connecting shaft, and a second limit pin is provided on the top of the leg plate mounting member, and a limit tension spring is connected between the first limit pin and the second limit pin; The position-limiting tension spring is connected between the leg plate connecting piece and the leg plate portion, and applies force to the leg plate portion and the leg plate connecting piece when limiting the position. The fitness chair as described in claim 5 or 8 is characterized in that a back support plate is horizontally arranged at the rear of the frame to support the back plate when the back plate is swung downward to a horizontal position. The fitness chair as claimed in claim 1, characterized in that: the fitness chair further comprises a walking mechanism; the walking mechanism comprises a walking traction mechanism for driving the frame to move; The walking traction mechanism comprises: The driving shaft and the driven shaft are rotatably arranged under the frame, and A driving wheel and a driven wheel are respectively arranged on the driving shaft and the driven shaft; and Double-groove rope wheel, first pulling rope, second pulling rope, pulling spring; The double-groove rope pulley is arranged on the driving shaft and is connected to the driving shaft through a clutch mechanism. One end of the first traction rope is wound in one of the grooves of the double-groove rope pulley, and the other end of the first traction rope passes through the guide wheel assembly arranged at the front end of the frame and is connected to the back plate; one end of the second traction rope is wound in the other groove of the double-groove rope pulley and passes through the guide wheel assembly in the opposite direction of the winding direction of the first traction rope, and the other end of the second traction rope is fixedly connected to the guide wheel assembly; one end of the traction spring is connected to the guide wheel assembly, and the other end is connected to the rear end of the frame. The fitness chair as described in claim 13 is characterized in that: the guide wheel assembly includes a front bracket fixed to the front end of the frame, a spring connecting plate hung with a traction spring, and a spring seat plate pivotally connected to the spring connecting plate; the spring connecting plate is pivotally connected to a first guide wheel and a second guide wheel in parallel, and the front bracket is pivotally connected to a third guide wheel and a fourth guide wheel in parallel, and the fourth guide wheel is a double wheel; the first traction rope is wound around one of the fourth guide wheels and then wound in the rope groove of the double-groove rope wheel, one end of the second traction rope is connected to the front bracket, and then wound around the second guide wheel, the third guide wheel, the first guide wheel, and the other of the fourth guide wheels and then wound in the other rope groove of the double-groove rope wheel and in the opposite direction of the pulling direction of the first traction rope; one end of the traction spring is hung on the spring connecting plate, and the other end is hung on the rear bracket and fixedly connected to the rear end of the frame through the rear bracket. The fitness chair as described in claim 13 is characterized in that: the clutch mechanism includes a first coupling member, a second coupling member, a reset spring, and a limit sleeve; the first coupling member is rotatably sleeved on the outside of the driving shaft; a second coupling member is provided on the side of the first coupling member away from the double-groove rope pulley, and the second coupling member is sleeved on the outside of the driving shaft. The second coupling member is key-connected to the driving shaft so that the second coupling member slides along the length direction of the driving shaft, a limit sleeve is provided on the side of the second coupling member away from the first coupling member, the reset spring sleeve is located between the second coupling member and the limit sleeve, and the second coupling member is engaged with the first coupling member under the extrusion of the reset spring; the second coupling member is connected to the frame through a switch assembly. The fitness chair as described in claim 15 is characterized in that: the switch assembly includes a clutch mounting frame, an eccentric wheel, a hand crank, a movable connecting rod, and a clutch sleeve; the clutch mounting frame is fixedly connected to the frame body, the eccentric wheel is rotatably connected to the clutch mounting frame and the center position of the eccentric wheel is fixedly connected to the hand crank, the middle part of the movable connecting rod is pivotally connected to the pin shaft of the clutch mounting frame, one end of the movable connecting rod abuts against the bottom end of the eccentric wheel, and the bottom of the other end of the movable connecting rod is connected to the clutch sleeve, and the clutch sleeve is arranged on the outside of the second coupling member and pushes the second coupling member to slide in the direction of the limit sleeve. The fitness chair as claimed in claim 1, characterized in that: the fitness chair comprises a first mechanical brake protection mechanism, and the first mechanical brake protection mechanism is two sets, which are respectively arranged on the outside of the two drive shafts; The first mechanical brake protection mechanism comprises a positioning assembly fixedly arranged on the outer end of the driving shaft, a positioning plate rotatably sleeved on the outer end of the driving shaft, and an electric push rod pivotally connected to the frame; the positioning plate is provided with a brake groove, and a drum brake component is provided in the brake groove, so that the drum brake component brakes the positioning plate; the drum brake component is hinged to the electric push rod, and the brake on the positioning plate is released when the electric push rod is shortened; The positioning plate is provided with a C-shaped regulating groove on the side opposite to the positioning assembly, and the positioning assembly has a regulating pin shaft, and the regulating pin shaft is embedded in the C-shaped regulating groove for movement; The electric push rod shortens to release the brake of the drum brake component on the positioning plate. The drive shaft drives the regulating pin to rotate through the positioning assembly, and drives the positioning plate to rotate cooperatively when it touches the end of the C-shaped regulating groove. When the user stretches the muscle to the maximum angle, the electric push rod extends, the drum brake component expands, and the positioning plate is braked, completing the mechanical brake setting of the first mechanical brake protection mechanism. The fitness chair as described in claim 17 is characterized in that: the drum brake component includes an elliptical brake sleeve rotatably arranged on the drive shaft, a brake plate fixedly arranged on the brake sleeve, an upper brake pad and a lower brake pad arranged on the periphery of the brake sleeve and hinged to each other at one end through a limit pin, the upper brake pad and the lower brake pad are provided with a brake spring assembly on the opposite side of the hinged end to provide braking force for the upper brake pad and the lower brake pad, and the brake plate is hinged to the electric push rod; the limit pin is hinged with a drum brake support plate, and the drum brake support plate is fixedly connected to the frame. The fitness chair as described in claim 18 is characterized in that: the brake spring assembly includes an adjusting pin, an adjusting spring and an adjusting nut, the adjusting pin is fixed on the upper brake plate, the lower brake plate is provided with a groove for the adjusting pin to be embedded, the periphery of the adjusting pin is provided with an adjusting spring, and the upper part of the adjusting pin is installed with an adjusting nut to compress the adjusting spring. The fitness chair as claimed in claim 17, characterized in that: the positioning assembly includes a positioning plate, and the regulating pin is arranged on the positioning plate on the opposite side of the regulating pin, the positioning plate is provided with a positioning pointer constituting an extended end of the positioning plate. The fitness chair as described in claim 18 is characterized in that: the positioning plate is provided with a torsion spring inside the brake groove, one end of the torsion spring is fixedly connected to the upper brake pad or the lower brake pad, and the other end is connected to the positioning plate to provide a restoring force for the positioning plate. The fitness chair as claimed in claim 17, characterized in that the fitness chair comprises a first photoelectric control mechanism, and the first photoelectric control mechanism comprises: The first photoelectric switch sensor is fixedly arranged on the periphery of the positioning plate on one side; when the tensioning rod swings to the high position, the positioning assembly first blocks the first photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction; The second photoelectric switch sensor is fixedly arranged on the periphery of another positioning plate; when the tensioning rod swings to the high position, if the positioning component blocks the first photoelectric switch sensor without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor and sends a reversal signal before the mechanical brake, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction; The third photoelectric switch sensor is arranged on the frame; the first shielding piece is arranged on the leg plate connecting piece; when the tensioning bar swings to the horizontal position, the leg plate connecting piece swings down to shield the third photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part and the leg plate connecting piece cooperate to swing upward in the opposite direction; The fourth photoelectric switch sensor is arranged on the frame; the second shielding piece is arranged on one side of the leg plate; during the retracting and extending swinging, the leg plate swings from horizontal to vertical, and when the second shielding piece shields the fourth photoelectric switch sensor, a braking signal is sent out to stop the retracting and extending swinging. The fitness chair according to claim 1, characterized in that: the fitness chair comprises a second mechanical brake protection mechanism, and the second mechanical brake protection mechanism comprises: Electric cylinder, used to output safety braking force at the high point of the tie rod swing; A positioning wheel, rotatably arranged at the outer end of the driving shaft, wherein the positioning wheel is provided with a C-shaped regulating groove on the inner side; A support plate is fixedly arranged on the frame; Two brake rods are arranged on both sides of the periphery of the positioning wheel disc and are pivotally connected to one side of the support plate through a support shaft; the lower ends of the two brake rods are hinged to the head and tail of the electric cylinder, and when the electric cylinder is extended and retracted, the two brake rods are swung open and closed with the support shaft as the center, so that the front end of the brake rods is engaged with or disengaged from the positioning wheel disc, braking is applied when engaged, and releasing the brake when disengaged; A positioning arm is mounted on the driving shaft, and a positioning shaft is provided on the positioning arm and is embedded in the C-shaped regulating groove and moves with the positioning arm; The driving shaft drives the positioning shaft to rotate through the positioning arm, and when it touches the end of the C-shaped regulating groove, it drives the positioning wheel to rotate cooperatively. When the user stretches the muscle to the maximum angle, the electric cylinder applies force, the brake rod engages with the positioning wheel, and the positioning wheel is braked to complete the mechanical brake setting of the second mechanical brake protection mechanism. The fitness chair as described in claim 23 is characterized in that: the positioning wheel is a positioning gear, the brake rod is a brake arm, and the front end of the brake arm is inlaid with a rack that meshes with the positioning gear during braking. The fitness chair as described in claim 23 is characterized in that a rope groove wheel is arranged on the outer side of the positioning wheel disc, and a reset wire rope is fixed and wound in the wheel groove of the rope groove wheel. The reset wire rope is connected to the cylindrical threaded tension spring after passing through the steering wheel assembly, and the other end of the cylindrical threaded tension spring is fixedly connected to the frame. The fitness chair as described in claim 25 is characterized in that the steering wheel assembly includes a steering shaft and a steering wheel rotatably arranged on the steering shaft, and the steering shaft is fixedly connected to the frame. The fitness chair as claimed in claim 23, characterized in that the fitness chair comprises a second photoelectric control mechanism, and the second photoelectric control mechanism comprises: The fifth photoelectric switch sensor is arranged at the top of the front side of the frame; the third shielding piece is arranged at the rear of the leg plate; during the retracting and extending swinging, the leg plate swings from horizontal to vertical, and when the third shielding piece shields the fifth photoelectric switch sensor, a braking signal is sent to stop the retracting and extending swinging; The sixth photoelectric switch sensor is arranged at the top of the middle part of the frame; when the tensioning rod swings to the horizontal position, the driven connecting rod blocks the sixth photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part and the leg plate connecting piece cooperate to swing upward in the opposite direction; The seventh photoelectric switch sensor is arranged on a positioning wheel; when the tensioning arm swings to a high position, the positioning arm first blocks the seventh photoelectric switch sensor and sends a reverse signal, so that the driven connecting rod, the leg plate part, and the leg plate connecting piece cooperate to swing downward in the opposite direction; The eighth photoelectric switch sensor is arranged on the positioning wheel on the other side and is spatially offset from the seventh photoelectric switch sensor; when the tensioning arm swings to a high position, if the seventh photoelectric switch sensor fails and does not send a reversal signal, the corresponding positioning arm blocks the eighth photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the driven connecting rod, the leg plate part, and the leg plate connecting piece to swing downward in the opposite direction in coordination. The fitness chair as claimed in claim 17 or 23, characterized in that: the clamping The angle satisfies 90 degrees < included angle ≤ 180 degrees. A working method of a fitness chair, characterized in that the working method comprises the following steps: S1, the fitness chair is stationary, in the seat state, the clutch mechanism is in the engaged state, the traction spring in the walking traction mechanism is in the stretched state, and the traction spring stores energy; S2, the person sits on the fitness chair and sets the number of stretching times on the fitness chair through the controller; S3, click the power start button, the power motor is powered, the drive shaft drives the active connecting rod to swing, and the driven connecting rod pushes the leg plate to swing upward from vertical; at the same time, with the swing of the active connecting rod, the back plate loses support, the energy stored in the pulling spring is released, the second pulling rope pulls the double-groove rope wheel to rotate, and the fitness chair moves forward, so that the fitness chair changes from a seat state to a bed state; when the leg plate reaches a horizontal position, it touches the photoelectric switch sensor of the first photoelectric control mechanism or the second photoelectric control mechanism, turns off the power motor, and stops swinging; S4, maximum swing angle setting: after the person lies flat, the handle switch is pushed down, the power motor drives the active connecting rod to continue to rotate, and the driven connecting rod, the leg board connecting piece, and the leg board part are pushed upward in coordinated motion; when the swing reaches the maximum angle that the user can bear, the handle switch is immediately released, the power motor stops moving, the confirmation button on the handle switch is clicked, the positioning plate or the positioning wheel is locked, and the maximum swing angle setting is completed; that is, the first mechanical brake protection mechanism or the second mechanical brake protection mechanism completes the mechanical brake setting of the maximum angle; S5. After locking the positioning plate or positioning wheel, the power motor reverses and the leg plate swings downward. When it reaches the horizontal position, the photoelectric switch issues a command, the power motor reverses and the leg plate swings upward. This is repeated until the set number of stretching times is completed and the leg plate is at the maximum angle. The photoelectric switch issues a command, the power motor stops rotating, and the electric push rod shortens to disengage the drum brake component from the brake disc, or the electric cylinder is actuated to disengage the brake rod from the positioning gear. S6, the positioning plate or the positioning wheel releases the brake, the power motor reverses, the driven connecting rod, the leg plate connecting piece, and the leg plate part cooperate to swing down and swing to a horizontal position, the power motor continues to rotate, so that the leg plate part and the back plate part change to a seat state position, and at the same time the fitness chair moves backward to the initial position, the positioning plate rotates with the control pin shaft or the positioning wheel rotates with the positioning shaft to the initial position; the pulling spring returns to the stretched state to store energy; this fitness chair stretching is completed; S7. If the fitness chair needs to be pushed, disconnect the clutch mechanism to disengage the clutch mechanism from the walking traction mechanism. A swing angle limiting braking protection mechanism, characterized in that it comprises: A power motor is arranged on the frame and has a driving shaft to output swing power; The positioning assembly is fixedly arranged at the outer end of the drive shaft. The positioning plate is rotatably mounted on the outer end of the drive shaft. Electric push rod; pivotally connected to the frame; The positioning disc is provided with a brake groove, and a drum brake component is provided in the brake groove, so that the drum brake component brakes the positioning disc; the drum brake component is hinged to the electric push rod, and the brake on the positioning disc is released when the electric push rod is shortened; A C-shaped regulating groove is provided on the positioning plate at one side of the positioning assembly, and the positioning assembly has a regulating pin, which is embedded in the C-shaped regulating groove for movement; The electric push rod shortens to release the brake of the drum brake component on the positioning plate. The drive shaft drives the control pin to rotate through the positioning assembly, and when it touches the end of the C-shaped control slot, it drives the positioning plate to rotate in coordination. When the electric push rod extends, the drum brake component expands, mechanically brakes the positioning plate, and sets the maximum swing angle of the drive shaft. The swing angle limited braking protection mechanism according to claim 30 is characterized in that: the drum brake component comprises: The brake sleeve has an elliptical outer circumference and is rotatably arranged on the drive shaft. The brake plate is fixed on the brake sleeve. The upper brake pad and the lower brake pad are arranged on the periphery of the brake sleeve and are hinged to each other at one end through a limit pin; The upper brake pad and the lower brake pad are provided with brake spring assemblies on the opposite sides of the hinged ends to provide braking force for the upper brake pad and the lower brake pad, and the brake plate is hinged to the electric push rod; the limit pin shaft is hinged with a drum brake support plate, and the drum brake support plate is fixedly connected to the frame. The swing angle limited braking protection mechanism as described in claim 31 is characterized in that: the brake spring assembly includes an adjusting pin, an adjusting spring and an adjusting nut, the adjusting pin is fixed on the upper brake pad, the lower brake pad is provided with a groove for the adjusting pin to be embedded, the periphery of the adjusting pin is provided with an adjusting spring, and the upper part of the adjusting pin is installed with an adjusting nut, and the braking force of the brake spring assembly on the upper brake pad and the lower brake pad is adjusted by adjusting the upper and lower positions of the adjusting nut. The swing angle limiting braking protection mechanism as described in claim 30 is characterized in that: the positioning assembly includes a positioning plate, and the regulating pin is arranged on the positioning plate; on the opposite side of the regulating pin, the positioning plate is provided with a positioning pointer to constitute an extended end of the positioning plate. The swing angle limiting braking protection mechanism as described in claim 30 is characterized in that a torsion spring is arranged on the inner side of the brake groove of the positioning plate, one end of the torsion spring is fixedly connected to the upper brake pad or the lower brake pad, and the other end is connected to the positioning plate to provide a restoring force for the positioning plate. The swing angle limiting brake protection mechanism as claimed in claim 30 is characterized in that: there are two power motors, and two sets of corresponding positioning components, positioning plates, and electric push rods; A first photoelectric switch sensor is fixedly arranged on the periphery of a positioning plate. When the driving shaft swings upward to a high position, the positioning component first blocks the first photoelectric switch sensor and sends a reverse signal to make the driving shaft swing downward in the opposite direction. A second photoelectric switch sensor is fixedly provided on the periphery of the other positioning plate. When the drive shaft swings upward, if the positioning component blocks the first photoelectric switch sensor without sending a reversal signal, the positioning component blocks the second photoelectric switch sensor and sends a reversal signal before the mechanical brake, causing the drive shaft to swing downward in the opposite direction. A swing angle limiting braking protection mechanism, characterized in that it comprises: A power motor is arranged on the frame and has a driving shaft to output swing power; Electric cylinder, used to output safety braking force at the high point of the swing; A positioning wheel, rotatably arranged at the outer end of the driving shaft, wherein the positioning wheel is provided with a C-shaped regulating groove on the inner side; A support plate is fixedly arranged on the frame; Two brake rods are arranged on both sides of the periphery of the positioning wheel disc and are pivotally connected to one side of the support plate through a support shaft; the lower ends of the two brake rods are hinged to the head and tail of the electric cylinder, and when the electric cylinder is extended and retracted, the two brake rods are swung open and closed with the support shaft as the center, so that the front end of the brake rods is engaged with or disengaged from the positioning wheel disc, braking is applied when engaged, and releasing the brake when disengaged; The positioning arm is fixedly mounted on the driving shaft, and the positioning arm is provided with a positioning shaft which is embedded in the C-shaped regulating groove and moves with the positioning arm; The driving shaft drives the positioning shaft to rotate through the positioning arm, and drives the positioning wheel to rotate in coordination when it touches the end of the C-shaped regulating groove; when the electric cylinder applies force, the brake rod engages with the positioning wheel to brake the positioning wheel and set the maximum swing angle of the driving shaft. The swing angle limiting braking protection mechanism as described in claim 36 is characterized in that the positioning wheel is a positioning gear, the brake rod is a brake arm, and the front end of the brake arm is inlaid with a rack that engages with the positioning gear during braking. The swing angle limiting braking protection mechanism as described in claim 36 is characterized in that a rope groove wheel is arranged on the outer side of the positioning wheel disc, and a reset wire rope is fixed and wound in the wheel groove of the rope groove wheel. The reset wire rope is connected to a cylindrical threaded tension spring after passing through the steering wheel assembly, and the other end of the cylindrical threaded tension spring is fixedly connected to the frame. The swing angle limiting braking protection mechanism as described in claim 36 is characterized in that the steering wheel assembly includes a steering shaft and a steering wheel rotatably arranged on the steering shaft, and the steering shaft is fixedly connected to the frame. The swing angle limiting brake protection mechanism as claimed in claim 36 is characterized in that: there are two power motors, and two sets of corresponding electric cylinders, positioning gears, and positioning arms; A seventh photoelectric switch sensor is arranged on a positioning wheel. When the driving shaft swings upward to a high position, the positioning arm first blocks the seventh photoelectric switch sensor and sends a reverse signal to make the driving shaft swing downward in the opposite direction. The other positioning gear is provided with an eighth photoelectric switch sensor, which is spatially offset from the seventh photoelectric switch sensor; when the drive shaft swings upward to a high position, if the seventh photoelectric switch sensor fails and does not send a reverse signal, the corresponding positioning arm blocks the eighth photoelectric switch sensor, and sends a reverse signal before the mechanical brake, so that the drive shaft swings downward in the opposite direction; The swing angle limiting braking protection mechanism as described in claim 30 or 36 is characterized in that the angle formed by the two groove end points of the C-shaped regulating groove and the center of the positioning wheel satisfies 90 degrees < angle ≤ 180 degrees.