WO2016119689A1 - Switch and electric tool - Google Patents

Abstract

A switch for an electric tool, comprising a switch shell; a trigger component and a sensing component accommodated in the switch shell, wherein the sensing component senses the trigger component and generates corresponding state signals; a first operating component (102) partially accommodated in the switch shell, and operatively enabling the relative positions of the trigger component and the sensing component to be changed; and a positive-negative rotation signal terminal (109) arranged outside the switch shell and electrically connected to the sensing component, so as to transfer a state signal of the sensing component to the electric tool connected thereto, wherein when the relative positions of the trigger component and the sensing component are in a first position, the sensing component generates a first state signal for indicating one of a positive rotation signal and a negative rotation signal; and when the relative positions of the trigger component and the sensing component are in a second position, the sensing component generates a second state signal for indicating the other one of the positive rotation signal and the negative rotation signal.

Description

Switches and power tools Technical field

The invention relates to a switch.

The invention also relates to a power tool having the switch.

Background technique

The switch of the existing power tool mostly adopts the contact of the moving contact and the fixed contact to realize the forward and reverse switching of the power tool, and the fixed contact piece includes the forward contact piece and the reverse contact piece, and is directly connected with the reversing rod of the power tool. The connected movable contacts are in contact with the positive fixed contact or the reverse fixed contact to output a corresponding forward or reverse signal. On the one hand, due to the long-term contact and friction loss between the contacts and the contacts, and the influence of the harsh vibration, the selection and processing requirements of the contacts and the contacts are extremely high, which increases the switching cost. On the other hand, long-term contact, friction, and vibration also wear contacts and contacts, greatly increasing the internal resistance of the contact between them, and even directly disengaging, and therefore, it is impossible to output a reliable and stable forward and reverse signal.

Summary of the invention

Based on this, it is necessary to provide an electric switch with low cost and stable signal in response to the above problems. An electric switch comprising:

a first housing, the outer surface of the first housing is provided with a shifting groove;

a toggle lever is slidably disposed in the toggle slot, one end of the toggle lever is located in the first housing, and the other end of the toggle lever protrudes from an outer surface of the first housing;

The electric switch further includes a first triggering member, a second triggering member and a sensing member. The first triggering member and the second triggering member are respectively located at two sides of one end of the toggle lever located in the first housing, and the sensing component is disposed in the first housing And fixed relative to the first housing;

The dialing groove includes a first end and a second end. When the toggle lever is pushed to the first end, the first triggering member of the toggle lever corresponds to the sensing component, and the sensing component senses that the first triggering component outputs a high level or a low level. Level; when the toggle lever is moved to the second end, the second trigger of the toggle lever corresponds to the sensing component, the sensing component senses the second trigger component, and the output and the sensing component sense the level of the first trigger component. Opposite low or high level, sensing parts and The first contact and the second contact are non-contact sensing.

In one embodiment, the sensing element is a Hall element, and the first trigger member faces the sensing member at one end of the magnet N pole, and the second trigger member faces the sensing member at one end of the magnet S pole.

In one embodiment, the electric switch further includes a control circuit, the control circuit includes a speed control circuit, and the output end of the speed control circuit is connected to the controller, the speed control circuit includes a first resistor and a sliding rheostat, and the first resistor and The sliding rheostats are connected in series.

In one embodiment, the control circuit further includes a forward and reverse switching circuit, the output of the forward and reverse switching circuit is coupled to the controller, and the forward and reverse switching circuit includes a Hall element.

In one embodiment, the electric switch further includes an elastic member, and the elastic member is movably connected to the sliding varistor, and the elastic member is pressed under an external force to connect the elastic member to the sliding varistor to adjust the resistance of the sliding varistor.

In one embodiment, the first housing further includes a pressing portion, the elastic member is located in the cavity of the pressing portion, the pressing portion is located at one side of the first housing, and the sliding portion is disposed in the first housing, under the action of an external force, The pressing portion presses the elastic member along the sliding groove.

In one embodiment, the electric switch further includes a second housing, the second housing being provided with a first recess that cooperates with a pressing portion of the first housing.

In one embodiment, the outer surface of the first housing where the pressing portion is located is further provided with a fixing seat, the second housing is further provided with a second groove, and the second groove of the second housing and the first housing The mount cooperates to mount the second housing on the first housing.

In one of the embodiments, the first housing is a closed housing and the control circuit is enclosed within the first housing.

In one of the embodiments, the outer side of the first housing is further provided with a connection terminal.

The present invention also provides another switch for a power tool, the switch operatively transmitting a forward rotation signal and a reverse rotation signal to a power tool connected thereto, the switch comprising: a switch housing; a trigger member and a sensing member, housed in In the switch housing, the sensing component senses the triggering member and generates a corresponding status signal; the first operating member is partially received in the switch housing, and operatively changes the relative positions of the triggering member and the sensing member; a positive and negative signal terminal disposed outside the switch housing and electrically connected to the sensing component to transmit a state signal of the sensing component to the power tool connected thereto; when the trigger component and the sensing component are in opposite positions When the first position is set, the sensing component generates a first state signal indicating one of a forward rotation signal and an inverted signal. When the relative position of the trigger member and the sensing member is in the second position, the sensing component generates the first The two-state signal represents the other of the forward signal and the inverted signal.

Preferably, the sensing member is fixedly disposed in the switch housing, and the first operating member is operable to change a position of the trigger member such that a relative position of the trigger member and the sensing member is changed.

Preferably, the first state signal and the second state signal are voltage signals.

Preferably, the first state signal is a signal whose value is higher than the first preset value; the second state signal is a signal whose value is lower than the second preset value; the first preset value is greater than or equal to the first Two preset values.

Preferably, the triggering member is a magnetic component, and the sensing component is a switching sensing component.

Preferably, the switch sensing element is a switch Hall, the first state signal is a high level signal, and the second state signal is a low level signal.

Preferably, the triggering member comprises a first magnet and a second magnet disposed separately. When the triggering member is in the first position, the N pole of the first magnet is opposite to the sensing component, when the triggering component is at In the second position, the S pole of the second magnet is opposite to the sensing member.

Preferably, the switch further includes a second operating member, a governing member and a speed regulating signal terminal; the second operating member is disposed outside the switch housing and is operatively at different positions; In the switch housing, different state signals are outputted in response to different positions of the second operating member to indicate different preset speeds; the speed control signal terminal is disposed outside the switch housing and electrically connected to the speed regulating component The status signal of the governor element is transmitted to the power tool connected thereto.

Preferably, the status signal output by the speed regulating element is a voltage signal.

Preferably, the second operating member switches between different positions in a stepless manner.

Preferably, the switch further includes a third operating member, an on-off component and an on-off signal terminal; the third operating member is partially received in the switch housing and is operatively at different positions; In the switch housing, the switching element is in a closed or open state in response to the third operating member being in a different position; the switching signal terminal is disposed outside the switch housing, and electrically connected to the switching element The connection transmits the state of the switching element to the power tool connected thereto.

Preferably, the third operating member is a second operating member, and the second operating member includes a release state and a triggering state. In the released state, the switching element is in an open state, and the speed regulating component outputs a solid The steady state signal, in the triggered state, the on/off element is in a closed state, and the status signal output by the speed regulating element changes as the position of the second operating member changes.

Preferably, the switch housing includes a first zone and a second zone that are isolated from each other, and the sealing degree of the second zone to the outside is higher than the sealing degree of the first zone to the outside, the sensing component and the trigger component Located in the first zone, the governor element is disposed in the second zone.

The present invention also provides a power tool including a motor, a control module, and a switch, the control module being electrically connected to the switch, and controlling a rotational motion of the motor according to a signal sent by the switch, wherein the switch is The switch as described above.

Preferably, the motor is a brushless motor, and the control module controls a power-on sequence of the brushless motor coil according to a signal transmitted by the forward/reverse signal terminal, thereby controlling the motor to achieve forward rotation or reverse rotation.

Preferably, the control module controls the direction of the current flowing through the motor according to the signal transmitted by the forward and reverse signal terminals, thereby controlling the motor to achieve forward rotation or reverse rotation.

The sensing member and the triggering member of the above-mentioned electric switch are non-contact type, thereby avoiding the loss problem caused by the contact between the contact and the contact piece of the conventional electric switch, and improving the life of the switch.

DRAWINGS

1 is a structural view of an electric switch of an embodiment;

2 is a structural view of another embodiment of an electric switch;

Figure 3 is a schematic view showing the operation of the toggle lever in the first working position;

Figure 4 is a schematic view showing the operation of the toggle lever in the second working position;

FIG. 5 is a circuit schematic diagram of an electric switch according to an embodiment; FIG.

6 is a schematic view showing the relationship between the stroke of the elastic member and the resistance of the sliding varistor according to an embodiment;

Figure 7 is a structural view of a power tool;

Figure 8 is a schematic view showing the operation of the first operating member of the switch of the power tool of Figure 7 in a first position and a second position;

Fig. 9 is a diagram showing an output signal of an inductive element of the embodiment shown in Fig. 8.

detailed description

In order to make the technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to The invention is not intended to limit the invention.

As shown in FIG. 1, an electric switch includes a first housing 10, a toggle lever 102, a first trigger member, a second trigger member, and a sensing member. The outer surface of the first casing 10 is provided with a dial groove 101.

The toggle lever 102 is slidably disposed in the dial slot 101. One end of the toggle lever 102 is located in the first housing 10, and the other end of the toggle lever 102 protrudes from the outer surface of the first housing 10. The operator adjusts the position of the toggle lever 102 at the dial slot 101 by dialing the toggle lever 102.

The first triggering member and the second triggering member are respectively located at two sides of one end of the toggle lever 102 in the first housing 10. The sensing component is disposed in the first housing 10 and is fixed relative to the first housing 10. The dial slot 101 includes a first end 103 and a second end 104, and the toggle lever 102 has a first working position and a second working position. Specifically, when the toggle lever 102 is pushed to the first end 103 of the dial slot 101, the toggle lever 102 is in the first working position, and the first triggering member of the toggle lever 102 corresponds to the sensing component, and the sensing component senses The first trigger member outputs a high level or a low level to control the motor of the power tool to rotate forward or reverse; when the toggle lever 102 is moved to the second end 104 of the dial slot 101, the toggle lever 102 is In the second working position, the second triggering member of the toggle lever 102 corresponds to the sensing component, and the sensing component senses the second triggering component to output a low level or a high level, and the sensing component senses the level of the first triggering component and the sensing component. The level of the second trigger output is reversed to control the motor's motor to reverse or forward.

The sensing component is connected to the controller of the motor, and the controller receives the high level or the low level of the output of the sensing component, and determines that the switch is in the forward or reverse state according to the received high level and low level, and the corresponding control power tool Forward or reverse.

The sensing component of the electric switch is non-contact-sensing with the first triggering component or the second triggering component. When the toggle lever is at the first end or the second end of the dialing slot, the corresponding first triggering component or the second triggering corresponding An inductive component fixed in the first housing, the sensing component sensing the first triggering component or the second triggering component to output a high level or a low level, and the controller controls the power tool according to the received high level or low level The forward or reverse rotation, because the sensing member and the first trigger member or the second trigger member are non-contact sensing, thereby avoiding the loss problem caused by the contact of the conventional electric switch with the contact and the contact, and reducing the electric switch cost.

In another embodiment, the sensing component is a Hall element, and the first triggering member and the second triggering member are opposite to each other at one end of the sensing component, that is, the first triggering member is opposite to the sensing component and is a magnet N. a pole, the second trigger member facing the sensing member is an S pole of the magnet, or the first trigger member is oriented One end of the sensing member is an S pole of the magnet, and one end of the second trigger member facing the sensing member is an N pole of the magnet.

As shown in FIG. 3, when the toggle lever 102 is pushed to the first end 103 of the dial slot 101, the first trigger member is adjacent to the Hall element, and the end of the first trigger member toward the sensing member is the N pole of the magnet. The Hall element senses a change in the magnetic field and outputs a high level. As shown in FIG. 4, when the toggle lever 102 is pushed to the second end 104 of the dial slot 101, the second trigger member is adjacent to the Hall element, and the second trigger member is toward the sensing member at the S pole of the magnet. The Hall element senses a change in the magnetic field and outputs a low level.

By using the Hall element as the sensing member, the magnet is used as the first triggering member and the second triggering member, and the first triggering member and the second triggering member are opposite to the sensing member at opposite ends of the magnet, so that the Hall element induces a change in the magnetic pole. And outputting different high level signals or low level signals, the controller determines that the toggle lever is in forward or reverse rotation according to the received high level signal or low level signal of the Hall element output to control the positive of the power tool. Turn or reverse to achieve positive and negative switching of the power tool. At the same time, since the high-level or low-level signal output by the Hall element is a digital signal, the signal can be directly detected by the controller, the signal is stable, and the anti-interference ability is strong.

As shown in FIG. 5, the electric switch further includes a control circuit including a forward/reverse switching circuit 30. The output end of the forward/reverse switching circuit 30 is connected to the controller of the power tool, and the forward/reverse switching circuit includes the foregoing Hall element. . As shown in FIG. 1 and FIG. 2, the electric switch further has a connection terminal 109. The output end of the forward/reverse switching circuit 30 is connected to the controller through the connection terminal 109, and the controller receives the high level or the low level of the output of the Hall element. According to the received high level and low level, the switch is in the forward or reverse state, and the corresponding control power tool is rotated or reversed.

The control circuit of the electric switch further includes a speed control circuit 40. The output end of the speed control circuit 40 is connected to the controller through the terminal 109 of the electric switch, and the speed control circuit 40 includes a first resistor R1 and a sliding rheostat R2, first The resistor R1 is connected in series with the sliding varistor R2, and the controller obtains the current of the speed control circuit according to the resistance of the sliding varistor R2 and the first resistor R1, and adjusts the rotation speed of the motor according to the output current of the speed control circuit.

The electric switch further includes an elastic member 42. The elastic member 42 is movably connected to the sliding varistor R2, and the elastic member 42 is pressed by an external force to connect the elastic member with the sliding varistor R2 to adjust the resistance of the sliding varistor.

Specifically, the resistance of the sliding varistor R2 is adjusted by the elastic member 42, and the elastic member 42 is in an initial state. The lower portion is disconnected from the sliding varistor R2, and the elastic member 42 is pressed by an external force. As shown in Fig. 6, it is a schematic diagram of the relationship between the stroke of the elastic member and the resistance of the sliding varistor. The moving range of the elastic member is 1.6±0.2~2.8±0.2mm, which is the pre-brightening stroke of the signal lamp, that is, when the elastic member moves 1.6±0.2~ At 2.8 ± 0.2 mm, the speed adjustment signal is turned on. When the elastic member continues to move under the action of the external force, the elastic member moves toward the sliding varistor and contacts the sliding piece of the sliding varistor, and the resistance of the varistor is slid by the moving member of the elastic member. When the elastic member moves 2.8±0.2mm, the elastic member contacts the sliding varistor and starts to adjust the resistance of the moving varistor. As the moving stroke of the elastic member increases, the resistance of the sliding varistor increases, and when the elastic member moves 6.8±0.3mm When the sliding varistor has the largest resistance, the moving stroke of the elastic member can be up to 8.0±0.2mm. The speed of the power tool is adjusted by adjusting the resistance of the sliding varistor by the elastic member to adjust the current. The above-mentioned electric switch can realize not only the forward and reverse switching of the power tool but also the speed adjustment of the power tool.

As shown in FIG. 1 , the first housing further includes a pressing portion 105 , the pressing portion 105 is a cavity structure, the elastic member 105 is located in the cavity of the pressing portion 105 , and the pressing portion 105 is located at one side of the first housing 10 and protrudes from The outer surface of the first casing 10 is provided with a sliding groove in the first casing. Under the action of an external force, the pressing portion 105 presses the elastic member along the sliding groove to move the elastic member and contact the sliding piece of the sliding varistor. In contact with the sliding piece of the sliding varistor, the operator can apply different pressure to the pressing portion according to different needs to change the compression amount of the elastic member to adjust the resistance of the sliding varistor; when the pressure is released, the pressing portion is in the elastic member Reset under effect. Wherein, the stroke of the elastic member is related to the compression amount of the elastic member, and the compression amount of the elastic member is in a predetermined proportional relationship with the resistance of the sliding varistor.

In the above-mentioned electric switch, by pressing the elastic member on the outer surface of the first casing 10, the elastic member is pressed, and the resistance of the sliding varistor is adjusted by adjusting the stroke of the elastic member to adjust the rotational speed of the electric tool, which is convenient to operate.

In another embodiment, as shown in FIG. 2, the electric switch further includes a second housing 20, and the second housing 20 is provided with a first recess that cooperates with the pressing portion 105 of the first housing, thereby The second housing 20 achieves pressing of the elastic member. As shown in FIG. 2, the end of the second casing away from the first casing has an arc structure, which is ergonomic and convenient for the operator to operate by hand.

Further, the outer surface of the first housing 10 is further provided with a fixing seat 106. The end of the second housing 20 contacting the first housing 10 has a second recess that cooperates with the fixing base 106, and the second housing 20 is mounted on the first housing 10 by the cooperation of the fixing base 106 and the second recess. The first housing 10 and the second housing 20 are The structure is detachably fitted to facilitate replacement and cleaning of the components in the first housing 10.

The first housing 10 is a closed housing, and the sensing member, the trigger member and the elastic member, and the control circuit are enclosed in the first housing 10, thereby preventing the device from being disturbed by dust and foreign matter.

The electric switch also has a terminal 109 that is external to the first housing 10 for connecting the control circuit connection within the first housing to the controller and power source.

FIG. 7 shows a preferred embodiment of a power tool provided by the present invention. The power tool 200 includes a tool housing 201, a switch 100 mounted on the tool housing 201, an energy supply unit 204, and a motor 206 and a control module 202 housed within the tool housing 201. The control module 202 is electrically connected to the switch 100 and controls the rotational movement of the motor 206 according to the signal sent by the switch 100.

Switch 100 is operative to transmit a forward and reverse signals to control module 202 coupled thereto. The control module 202 controls the motor 206 to rotate forward according to the forward rotation signal, and controls the motor 206 to reverse according to the reverse signal.

In the case that the motor 206 is a brushed motor, when the control module 202 receives the forward rotation signal sent by the switch 100, the control module 202 controls the current flow of the energy supply unit 204 to the motor 206 to be the first direction; the control module 202 receives the switch. When the inverted signal is transmitted by 100, the control module 202 controls the current flow of the energy supply unit 204 to the motor 206 to be in the second direction. The first direction is opposite to the second direction.

When the motor 206 is a brushless motor, the brushless motor includes a first coil, a second coil, and an Nth coil. When the control module 202 receives the forward rotation signal transmitted by the switch 100, the control module 202 controls the energization sequence of the N coils to be the first energization sequence, for example, the first coil to the Nth coil or the second coil to the Nth coil to the first When the control module 202 receives the reverse signal sent by the switch 100, the control module 202 controls the energization sequence of the N coils to be the second power-on sequence, for example, the Nth coil to the first coil or the N-1 coil to the first coil. Then to the Nth coil. The first energization sequence of energization of the N coils is opposite to the second energization sequence.

The switch 100 includes a switch housing, a trigger member and an inductive member, a first operating member, and a forward and reverse signal terminal. The triggering member and the sensing member are housed in the switch housing, and the sensing member senses the triggering member and generates a corresponding status signal to be sent to the positive and negative signal terminals. The first operating member is received in the switch housing, can be operated by the operator and is in different positions, and drives the trigger member and the sensing member in opposite first and second positions. The positive and negative signal terminals are disposed outside the switch housing, and are electrically connected to the sensing component, and the sensing component is The status signal is passed to the power tool connected to it. When the triggering member and the sensing member are in the opposite first positions, the sensing member generates a first state signal indicating one of a forward rotation signal or a reverse rotation signal, and when the trigger member and the sensing member are in the opposite second position, the sensing member A second status signal is generated indicating the other of the forward signal or the inverted signal.

A block diagram of a preferred embodiment of the switch 100 is shown in FIG. At this time, the switch housing is the first housing 10. The first operating member is the toggle lever 102. The forward and reverse signal terminals are the terminals 109. In this embodiment, the sensing member is fixedly disposed in the switch housing. The position of the trigger member changes as the position of the first operating member changes, such that the relative position of the trigger member and the sensing member switches between the first position and the second position. In other embodiments, the position of the trigger member may be fixed, and the position of the sensing member changes according to the change of the position of the first operating member, so that the relative position of the trigger member and the sensing member is switched between the first position and the second position. . The structure of the switch 100 can also be other structures that can be conceived by those skilled in the art in light of the above-described description in conjunction with common general knowledge in the art.

The way of interaction between the sensing member and the trigger member is inductive, that is, non-contact. Specifically, the non-contact sensing method may be any one of a photoelectric method, a piezoelectric method, a magnetoelectric method, a capacitive method, and an inductive method. In different sensing modes, it is further divided into switch sensing and linear sensing.

Taking the magnetoelectric method as an example, the trigger member is a magnet, and the sensing member is a linear Hall for linear sensing. At this time, the correspondence relationship between the position of the trigger member and the voltage value outputted by the sensing member is as shown in FIGS. 8 and 9. When the trigger member is in the first position, the status signal output by the sensing member is the first status signal. The first state signal is a voltage signal having a voltage higher than the first preset value A. When the trigger member is in the second position, the status signal output by the sensing member is the second status signal. The second state signal is a voltage signal whose voltage is lower than the second preset value B. The first preset value A is greater than or equal to the second preset value B.

Taking the magnetoelectric method as an example, the trigger member is a magnet, the sensing member can be a linear Hall for linear sensing, and the sensing member can also be a switching Hall or a reed switch for switching sensing. At this time, the first state signal is a high level signal, and the second state signal is a low level signal. In order to achieve the above functions, the specific structural forms of the sensing member and the trigger member are various.

In the embodiment shown in Figures 3 and 4, the sensing member is a switching Hall, and the trigger member includes a first magnet and a second magnet that are coupled to the toggle lever 102. The first magnet and the second magnet are disposed separately. First magnet And the second magnet has an N pole and an S pole, respectively. When the toggle lever 102 is in the first position, the N pole of the first magnet faces the sensing member. The sensing component senses a change in the magnetic field and outputs a first state signal, a high level. When the toggle lever 102 is in the second position, the S pole of the second magnet is directly opposite the sensing member. The sensing component senses a change in the magnetic field and outputs a second state signal, a low level. In this embodiment, the first state signal and the second state signal are voltage signals. In other embodiments, the first state signal and the second state signal may also be current signals, pulse signals, and the like.

In the embodiment shown in FIGS. 1 and 2, the sensing member is fixedly disposed in the switch housing, and the position of the trigger member changes with the change of the position of the first operating member, so that the relative position of the trigger member and the sensing member is first. Switch between position and second position. In other embodiments, the trigger member may be fixedly disposed in the switch housing, and the position of the sensing member changes with the change of the position of the first operating member, so that the relative positions of the trigger member and the sensing member are in the first position and the second position. Switch between locations. Switch 100 is also operative to transmit a speed control signal to control module 202 coupled thereto. The control module 202 controls the motor 206 to be at a corresponding rotational speed based on the speed control signal.

The switch 100 further includes a second operating member, a governing member, and a speed regulating signal terminal. The second operating member is disposed outside of the switch housing and is operatively at different positions. The governing element is disposed in the switch housing, and outputs different status signals in response to different positions of the second operating member to indicate different preset rotational speeds. The speed regulating signal terminal is disposed outside the switch housing, and is electrically connected to the speed regulating component, and transmits the state signal of the speed regulating component to the power tool connected thereto. The status signal output by the speed regulating component may be a voltage signal, a current signal, a resistance signal, a pulse signal, or the like.

The position change of the second operating member can realize the stepless speed adjustment by means of slipping, or the stepwise speed adjustment can be realized by means of a knob. A specific implementation of stepless speed regulation by slipping is illustrated in Figures 1 and 2.

In the embodiment shown in Figs. 1, 2, and 5, the second operating member is the pressing portion 105, the speed regulating member is the speed control circuit 40, and the speed regulating signal terminal is the terminal 109 connected to the VR in Fig. 5. The second operating member can optionally further include a second housing 20. The second housing 20 is provided with a first recess that engages with the pressing portion 105, thereby increasing the pressing area when the operator presses the pressing portion 105, thereby improving the comfort of pressing. The second operating member is operatively pressed or released such that it is in a triggered state and a released state. When the second operating member is in the triggered state, the elastic member 42 in the pressing portion 105 is compressed, thereby adjusting the sliding rheostat The output resistance value of R2, and then the voltage value outputted by the speed control signal terminal. When the second operating member is in the released state, the output resistance of the sliding varistor R2 is a fixed value, and correspondingly, the voltage signal outputted by the speed regulating signal terminal is a fixed value.

In the embodiment shown in Figures 1, 2, and 5, the terminal 109 includes both a speed control signal terminal and a forward and reverse signal terminal. Therefore, the control module 202 of the power tool connected thereto can receive the forward/reverse signal sent by the switch 100 or the speed control signal sent by the switch 100.

The operator operates the first operating member to place the trigger member in the first position, the forward/reverse signal terminal outputs a high level signal to the control module 202 of the power tool, and the control module 202 recognizes that the signal sent by the switch 100 is a forward rotation signal. On the contrary, the operator operates the first operating member to place the trigger member in the second position, the forward/reverse signal terminal outputs a low level signal to the control module 202 of the power tool, and the control module 202 recognizes that the signal sent by the switch 100 is an inverted signal.

Subsequently, the operator triggers the second operating member and stays in a fixed position. The speed control signal terminal converts the position information into a voltage signal and transmits it to the control module 202, and the control module 202 recognizes the preset speed set by the operator.

In the power tool, after the power switch in the energy supply unit 204 to the energy supply circuit of the motor 206 is closed, the control module 202 controls the motor 206 to rotate forward, and controls the motor 206 to rotate at the target speed according to the signal transmitted by the speed control signal terminal.

In the embodiment shown in Figs. 1, 2, and 5, the governing member includes a fixed portion (resistor R2) and a moving portion (slider of the sliding varistor R2) which are two portions in contact with each other. In other embodiments, the fixed portion and the moving portion may be two portions that are non-contact. Specifically, the method disclosed in the Chinese patent application CN201510883689.1.

The switch 100 is also operative to send an on/off signal to the control module 202 coupled thereto, and the control module 202 controls the motor 206 to rotate or stop based on the on/off signal.

The switch 100 further includes a third operating member, an on-off element, and an on-off signal terminal. The third operating member is partially received in the switch housing and is operatively at different positions. The switching element is disposed in the switch housing, and the switching element is in a closed or open state in response to the third operating member being in a different position. The on-off signal terminal is disposed outside the switch housing, and is electrically connected to the on-off element to transmit the state of the on-off element to the power tool connected thereto. The third operating member can be set independently of the second operating member, or can be integrated into the second function In the operating part.

In the embodiment shown in Figures 1, 2, 5, the third operating member is a second operating member. The second operating member includes a release state and a trigger state. In the released state, the on-off component is in an off state, the governor element outputs a fixed state signal, and in the triggered state, the on-off component is in a closed state, and the speed-regulating component outputs The status signal changes as the position of the second operating member changes. The switching element is a switch between the two nodes A and B in FIG. 5, and the on/off signal terminal is a terminal 109 connected to A and B. The switching element in this embodiment may be a power switch of a power tool or a signal switch. When the switching element is a power switch, the switching element is closed, the energy supply unit 204 of the power tool is transmitted to the motor 206 via the power switch and the on/off signal terminal, and the motor 206 is activated. When the on-off element is a signal switch, the state of the signal switch is transmitted to the control module 202 via the on-off signal terminal, and the control module 202 controls the power switch in the energy supply circuit of the energy supply unit 204 to the motor 206 to be closed or opened, thereby controlling Motor 206 is started or stopped.

In the present embodiment, the terminal 109 includes both a forward and reverse signal terminal, and an on/off signal terminal and a speed control signal terminal. Therefore, the control module 202 of the power tool connected thereto can receive the forward and reverse signals sent by the switch 100, and can also receive the on/off signal and the speed control signal sent by the switch 100.

The operator operates the first operating member to place the trigger member in the first position, the forward and reverse signal terminals output a high level signal to the control module 202 of the power tool, and the control module 202 recognizes that the high level signal indicates the forward rotation signal. Conversely, the operator operates the first operating member to place the trigger member in the second position, the forward and reverse signal terminals output a low level signal to the control module 202 of the power tool, and the control module 202 recognizes that the low level signal indicates the reverse signal.

Subsequently, the operator triggers the second operating member, once the second operating member is triggered, the switching element is closed, the energy providing circuit of the energy providing unit 204 to the motor 206 is closed, and the control module 202 controls the motor 206 to start normal rotation. When the operator triggers the second operating member and stays in the fixed position, the speed regulating signal terminal converts the position information into a voltage signal and transmits the signal to the control module 202, and the control module 202 identifies the preset speed set by the operator, and according to the adjustment The signal transmitted by the speed signal terminal controls the motor 206 to rotate at a preset speed.

In the foregoing switch 100, the mode of action between the sensing element and the triggering member for transmitting the forward and reverse signals is inductive, that is, the non-contact mode; and the fixed portion inside the speed regulating element that transmits the speed regulating signal The mode of action with the moving part can be inductive or contact. The contact method and the non-contact method have different requirements on the dustproof of the housing, and the contact method has higher requirements on dust prevention. Therefore, when the action between the fixed portion and the moving portion inside the speed regulating member is in the contact mode, preferably, the inner cavity of the switch housing includes the first region and the second region which are isolated from each other. The sealing degree of the second zone to the outside is higher than the sealing degree of the first zone to the outside. The sensing member and the trigger member are disposed in the first region. The speed control element is disposed in the second zone. More preferably, the switching element is also disposed in the second zone.

It can be understood by those skilled in the art that the switch 100 provided by the present invention can also only transmit a forward or reverse signal, and an on/off signal, and cannot transmit a speed control signal. At this time, the switch 100 includes a switch housing, a first operating member, a trigger member, a sensing member, a forward and reverse signal terminal, a second operating member, a switching element, and an on/off signal terminal.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims (16)

A switch for a power tool, the switch operatively transmitting a forward rotation signal and a reverse rotation signal to a power tool connected thereto, wherein the switch comprises: Switch housing The triggering member and the sensing member are received in the switch housing, and the sensing member senses the triggering member and generates a corresponding status signal; The first operating member is partially received in the switch housing, and operatively changes a relative position of the trigger member and the sensing member; a positive/negative signal terminal disposed outside the switch housing and electrically connected to the sensing component to transmit a status signal of the sensing component to the power tool connected thereto; When the relative position of the triggering member and the sensing member is in the first position, the sensing member generates a first state signal indicating one of a forward rotation signal and a reverse rotation signal when the relative position of the trigger member and the sensing member is in the second position. The sensing element generates a second status signal indicating the other of the forward signal and the inverted signal. The switch according to claim 1, wherein said sensing member is fixedly disposed in said switch housing, said first operating member operatively changing a position of said trigger member such that a trigger member and The relative position of the sensing member changes. The switch of claim 1 wherein said first state signal and said second state signal are voltage signals. The switch according to claim 1, wherein the first state signal is a signal having a value higher than a first preset value; and the second state signal is a signal having a value lower than a second preset value; The first preset value is greater than or equal to the second preset value. The switch of claim 1 wherein said trigger member is a magnetic element and said sensing member is a switch sensing element. The switch according to claim 5, wherein said switching sensing element is a switching Hall, said first state signal is a high level signal, and said second state signal is a low level signal. The switch according to claim 6, wherein said trigger member comprises a first magnet and a second magnet which are disposed separately, and when said trigger member is in the first position, said N pole of said first magnet The sensing member is facing right, and when the triggering member is in the second position, the S pole of the second magnet is opposite to the sensing member. The switch according to claim 1, wherein said switch further comprises a second operating member, a governing member and a speed regulating signal terminal; said second operating member being disposed outside said switch housing and operatively located a different position; the speed regulating element is disposed in the switch housing, and outputs different state signals in response to different positions of the second operating member to indicate different preset speeds; the speed control signal terminal is disposed outside the switch housing And electrically connected to the speed regulating component, and transmit a state signal of the speed regulating component to the power tool connected thereto. The switch according to claim 8, wherein the state signal output by the speed regulating element is a voltage signal. The switch according to claim 8, wherein said second operating member is switched between different positions in a stepless manner. The switch according to claim 8, wherein the switch further comprises a third operating member, a switching element and an on/off signal terminal; and the third operating member is partially received in the switch housing and is operatively different Positioning; the switching element is disposed in the switch housing, the switching element is in a closed or open state in response to the third operating member being in a different position; the switching signal terminal is disposed in the switch housing Externally, the connection element is electrically connected, and the state of the on-off element is transmitted to the power tool connected thereto. The switch according to claim 11, wherein the third operating member is a second operating member, and the second operating member includes a released state and a triggered state, and in the released state, the switching member is broken In the open state, the governor element outputs a fixed status signal. In the triggered state, the on/off element is in a closed state, and the status signal output by the speed regulating element changes as the position of the second operating member changes. The switch according to claim 8, wherein the switch housing includes a first zone and a second zone that are isolated from each other, and the second zone has a higher degree of sealing from the outside than the first zone and the outside The degree of sealing, the sensing member and the trigger member are disposed in the first region, and the speed regulating member is disposed in the second region. A power tool including a motor, a control module, and a switch, The control module is electrically connected to the switch and controls the rotational movement of the motor according to the signal sent by the switch, wherein the switch is the switch according to any one of claims 1-13. The electric power tool according to claim 14, wherein the motor is a brushless motor, and the control module controls a power-on sequence of the brushless motor coil according to a signal transmitted from the forward/reverse signal terminal, thereby controlling the motor to achieve forward rotation. Or reverse. The electric power tool according to claim 14, wherein said control module controls a direction of a current flowing through the motor according to a signal transmitted from the forward/reverse signal terminal, thereby controlling the motor to achieve forward rotation or reverse rotation.

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