TWI768436B - Torque wrench to avoid over-tightening - Google Patents

Abstract

The present invention provides a torque wrench for avoiding over-locking, comprising: a hollow tube body, and a rod, a head, a jacking piece, a jump-off mechanism, an elastic body mounted on the tube body element, an adjustment mechanism and an energy absorbing member, the energy absorbing member is arranged between the end of the rod and a side wall of the pipe body; when the jumping mechanism is actuated, the end of the rod oscillates, and the energy absorbing member is Absorbs the impact force at the end of the rod, effectively reducing the phenomenon of excessive rotation of the screw by the operator's inertial force.

Description

Torque wrench to avoid over-tightening

The present invention is related to a torque wrench, and specifically refers to a torque wrench that avoids excessive locking.

A torque wrench with a tripping mechanism can provide a torque warning function. When the operating torque of the wrench reaches the torque setting value, the tripping mechanism will trip, forming a warning effect, reminding the user that the set torque has been reached, and stop pulling. Turn the wrench to avoid over-tightening.

However, the force applied by pulling the wrench has inertia phenomenon, and when the user receives the warning, the force application action cannot be stopped immediately, and the force application can be stopped by continuously pulling the wrench for a short period of time. Take the wrench tightening the nut or the screwed component of the bolt as an example. During the operation, the wrench has two peaks. The first peak is the first peak when the tripping mechanism is tripped, and the second peak is the user. The second peak caused by the applied pressure cannot be released in time. At this time, the additional torque exerted by the inertial force exceeds the torque required for the tightening of the screw, resulting in the loss of the over-tightened screw.

The main purpose of the present invention is to provide a torque wrench that avoids over-locking, and when the wrench reaches a set torque value, it reduces the situation that the wrench continues to apply torque to the rotating member.

A torque wrench for avoiding excessive locking provided by the present invention includes: a hollow tube body; a rod piece pivoted at the front end of the tube body and can swing, and the rear end of the rod piece is located in the tube body; A head is set at the front end of the rod; a jacking piece is located behind the rod and can be displaced along the pipe body; a jump-off mechanism is formed between the rear end of the rod and the front end of the jacking piece between; an elastic element, arranged in the pipe body, behind the jacking piece, the elastic force of the elastic element acts on the jacking piece, and then applied to the jumping mechanism; when the torque wrench reaches the torque setting value , the jumping mechanism will act; the rod is oscillated, and its end swings to the side of the tube body; an adjustment mechanism is installed on the tube body, and can adjust the elastic element to hold the jacking piece the elastic force; an energy absorbing member is arranged between the end of the rod and a side wall of the tube body; when the jumping mechanism is actuated, the end of the rod oscillates, and the energy absorbing member absorbs the end of the rod impact.

Thereby, when the torque wrench of the present invention is operated and reaches the set torque value, when the tripping mechanism trips, the energy absorbing member will absorb the kinetic energy of the end of the rod, so that the operator pulls the wrench with the force at It will not be applied to the wrench for a short period of time, which reduces the inertial force to turn the wrench and reduces unnecessary operating force.

Preferably, the energy absorbing member is arranged on one side of the tube body; when the tripping mechanism is actuated, the end of the rod hits the energy absorbing member.

Preferably, the energy absorbing member is an elastic member, which generates a compression stroke when absorbing the impact force of the rod.

Preferably, the energy absorbing member has a pressure member and an elastic member, the pressure member is facing the end of the rod and can be displaced in the swing direction of the end of the rod; the elastic member is elastic The pressure-receiving part is supported; when the tripping mechanism is actuated, the end of the rod hits the pressure-receiving part, and the elastic member is compressed.

10: Wrench

20: Tube body

25: Rods

251: Pivot Pin

26: Pivot

30: top holder

301: Pivot Pin

32: Elastic element

321: End pieces

321: End pieces

33: Cylinder pieces

40: Adjustment mechanism

41: Fixing parts

411: screw hole

42: Grip

44: Screw

50: Escape Mechanism

52: The first recess

54: Second recess

55: Top Block

56: Roller

561: Pivot

57: Roller

571: Pivot

59: connecting rod

60: Energy Absorbing Components

61: Elastic member

62: Pressure parts

63: capping

64: Alcove

65: Opening

In order to enable your examiners to further understand the purpose, features and effects of the present invention, three preferred embodiments of the present invention are listed below, and are described in detail with the drawings: FIG. 1 is a preferred embodiment of the present invention A perspective view of the torque wrench.

2 is a top longitudinal sectional view of the torque wrench according to the first preferred embodiment of the present invention.

FIG. 3 is a partial enlarged view of FIG. 2 .

FIG. 4 is an action diagram of the jumping mechanism according to the first preferred embodiment of the present invention when the jumping mechanism is jumped, showing the state in which the energy of the rod is absorbed.

5 is a top longitudinal sectional view of a torque wrench according to a second preferred embodiment of the present invention.

FIG. 6 is a partial enlarged view of FIG. 5 .

FIG. 7 is an action diagram of the jumping mechanism according to the second preferred embodiment of the present invention when the jumping mechanism is produced, showing the state in which the energy of the rod is absorbed.

8 is a top longitudinal sectional view of a torque wrench according to a third preferred embodiment of the present invention.

FIG. 9 is an action diagram of the jumping mechanism according to the third preferred embodiment of the present invention when the jumping mechanism is produced, showing the state in which the energy of the rod is absorbed.

Please refer to FIG. 2 to FIG. 3 , which are a preferred embodiment of the torque wrench for avoiding over-locking provided by the present invention. The wrench 10 is a torque wrench with a tripping mechanism. The purpose of the present invention is to use the unique energy absorbing member of the wrench 10 to avoid the lack of excessively tightened screws caused by inertial force.

The structure of the torque wrench 10 according to the first preferred embodiment of the present invention will be described below. Please refer to FIG. 2 to FIG. 3 , the wrench 10 has: a tube body 20 , a rod 25 and a head 22 disposed at the front end of the rod 25 . The head 22 can be in the form of an open-end wrench, a socket wrench or a ratchet wrench, etc., which is not limited to the structure of the present embodiment; the wrench 10 uses the head 22 to rotate a threaded member (bolt or nut) or a socket . The rod 25 is pivoted at the front end of the tube body 20 with a pivot 26 and swings with the pivot 26 as a pivot point. The rear end of the rod 25 is located inside the pipe body 20 , and the head 22 is located outside the pipe body 20 .

A holding member 30 and an elastic element (which is a compression spring) 32 are sequentially disposed in the tube body 20 from front to back. The top holding member 30 is located behind the rod member 25 and can slide within the tube body 20 . The elastic element 32 is disposed in the pipe body, between the rear of the jacking member 30 and the screw rod 44 , and its front and rear ends elastically abut the jacking member 30 and the screw rod 44 by means of end pieces 321 and 322 respectively. , the elastic force of the elastic element acts on the top holding piece, and then is applied to a jumping mechanism 50; in addition, a hollow cylindrical piece 33 is sleeved on the outer circumference of the top holding piece 30, and the inner wall surface of the pipe body 20 Contact, the cylinder member 33 can be made of a softer material, such as copper, which can reduce the frictional force of the jacking member 30 when the tube body is displaced, and the cylinder member 33 has the function of stabilizing the jacking member 30 to prevent jacking The parts shake in the pipe body 20, thereby improving the stability of the wrench and the accuracy of the torque value.

An adjustment mechanism 40 is arranged in the tube body 20, including: a handle 42, a screw rod 44 and a fixing piece 41, the fixing piece 41 is fixed in the tube body 20; the screw rod 44 is screwed on In the screw hole 411 of the fixing piece 41 , the rear end of the screw rod 44 is directly connected with the handle 42 or indirectly connected with the handle 42 through other components, and the front end of the screw rod 44 contacts the elastic through the end piece 322 The element 32, when the handle 42 is rotated, the screw 44 is driven to rotate together Then, the screw rod 44 and the end piece 322 are driven to displace to different positions along the longitudinal direction of the tube body 20 , thereby changing the elastic force of the elastic element 32 pressing the pushing piece 30 .

The jumping mechanism 50 is arranged between the rear end of the rod 25 and the jacking member 30 . When the force of the wrench 10 exceeds the set torque value, the jumping mechanism 50 produces a jumping effect. The jumping mechanism 50 can be in different forms, and this embodiment discloses a jumping mechanism in one form, but is not limited thereto. The jumping mechanism 50 includes: a first concave portion 52 disposed at the rear end of the rod member 25, a second concave portion 54 disposed at the front end of the pushing member 30, and a top block 55 in the shape of a rectangle or a cube. The block 55 is in contact with the two recesses 52 and 54 . Since the jacking element 30 bears the elastic force of the elastic element 32 , the jacking block 55 is elastically clamped by the jacking element 30 and the rod element 25 . As shown in FIG. 3 , when the jumping mechanism 50 is in a normal state, the two concave portions 52 and 54 are facing each other, and the front and rear end surfaces of the top block 55 are respectively in contact with the two concave portions.

An energy absorbing member 60 is disposed between the end of the rod member 25 and a side wall of the tube body 20 . In this preferred embodiment, an opening 65 is formed on a side wall of the tube body 20 , corresponding to the end of the rod member 25 . ; A cover 63 is installed on the tube body 20 and closes the opening 65: an alcove 64 is installed on the inner wall surface of the cover 63; the energy absorbing member 60 is installed in the alcove of the cover 63 In 64, there is an elastic member 61 and a pressure-receiving member 62, the pressure-receiving member 62 is facing the end of the rod member 25 and can be displaced in the swing direction of the end of the rod member 25; the elastic member 61 is elastically supported The pressure-receiving member 62, the elastic member 61 is a compression spring, one end of which is wrapped around one end of the pressure-receiving member 62, and the two ends of the elastic member 61 are respectively abutted against the inner wall of the cavity 64 and the pressure-receiving member. It can keep pushing the pressure-receiving member 62 toward the direction of the rod. In normal state, the pressure-receiving member 62 protrudes from the cover 63 . As shown in FIG. 4 , when the jumping mechanism 50 is actuated, the end of the rod 25 swings and hits the pressure-receiving member 62 of the energy absorbing member 60 . The elastic structure of the energy absorbing member 60 swings. The member 61 is compressed to generate a compression stroke, so that the pressure-receiving member 62 and the elastic member 61 are displaced into the cavity 64 ; the energy absorbing member 60 absorbs the impact force at the end of the rod member 25 . The energy absorbing member 60 can be in different forms, and this embodiment discloses one form of the energy absorbing member, but is not limited thereto. The cover 63 is shaped like the side wall of the tube body 20 , so that the energy absorbing member 60 of the present embodiment seems to be disposed on the side wall of one side of the tube body.

When the torque wrench 10 of the present invention is in use, the user can set the torque value of the wrench 10 through the adjustment mechanism 40 . When the force of the wrench 10 to rotate the threaded member or the sleeve reaches the set torque, the jumping mechanism 50 will Slipping/jumping occurs, as shown in FIG. 4 , the end of the rod 25 is deflected to one side of the wrench and collides with the energy absorbing member 60 , and the two recesses 52 and 54 are in a misaligned state and are not aligned. When the tripping mechanism 50 is tripped, it will generate vibration and make a sound. With the vibration and sound, the user can easily and quickly determine that the applied force of the wrench 10 has reached the set torque value.

When the energy absorbing member 60 jumps out of the jumping mechanism 50 , the end of the rod 25 will hit the pressure receiving member 62 of the energy absorbing member 60 , and the pressure receiving member 62 and the elastic member 61 will be displaced into the cavity 64 . The elastic member 61 is compressed to absorb the kinetic energy of the rod 25 . The energy absorbed during the compressed stroke of the energy absorbing member 60 is equal to the force exerted by the operator. Therefore, when the tripping mechanism 50 is tripped, the inertial force exerted by the operator during the short period of the compression stroke of the energy absorbing member 60 It is absorbed by the elastic member 61 of the energy absorbing member 60 and is not applied to the wrench 10 . Therefore, in a short period of time when the energy absorbing member 60 absorbs energy, the force exerted by the operator is not effectively applied to the wrench 10 , and the inertia force of the operator acting on the wrench 10 is reduced. The effect of absorbing energy by the energy absorbing member 60 is to reduce the inertial effect of the operator pulling the wrench 10. The force acts on the outside of the screwed components, and it also strives for the time for the operator to stop applying force, effectively reducing the phenomenon of excessive rotation of the screwed components.

Please refer to FIGS. 5 to 6 , which are the second preferred embodiment of the wrench 10 ′ of the present invention, which also includes: a pipe body 20 , a rod 25 , a pivot 26 , a head 22 , and an elastic Element 32 , an adjustment mechanism 40 , a jump-off mechanism 50 and an energy absorbing member 60 , the same elements are represented by the same element symbols, and the structural features of the elements can be referred to the description of the first preferred embodiment, so they are not repeated here. .

As shown in FIG. 6 , in this embodiment, the jumping mechanism 50 is also formed between the jacking member 30 and the rod member 25 , and includes: a connecting rod 59 and two rollers 56 and 57 . The jacking member 30 One end of the link 59 is pivotally connected to one end of the link 59 by a pivot pin 301 , the other end of the link 59 is pivoted to the end of the rod 25 by a pivot pin 251 , and one end of the top support 30 corresponds to the same side of the energy absorbing member 60 . The two rollers 56, 57 are pivoted by the two pivots 561, 571, and the two rollers 56, 57 are used to roll on the inner wall of the tube body 20, so that the top holder 30 can slide straight and avoid causing the top holder 30 The situation of rubbing the inner wall of the tube body 20 affects the torque value when the force is actually applied. The escape mechanism is a well-known structure and will not be described in detail.

As shown in FIG. 6 , the energy absorbing member 60 is disposed between the end of the rod 25 and a side wall of the tube body 20 . Specifically, an opening 65 is provided on a side wall of the tube body, corresponding to the rod 25 . A cover 63 is installed on the tube body 20 and closes the opening 65, and an alcove 64 is set on its inner wall; the energy absorbing member 60 is installed in the alcove 64 of the cover 63, There is an elastic member 61 and a pressure-receiving member 62, the pressure-receiving member 62 is facing the end of the rod member 25 and can be displaced in the swing direction of the end of the rod member 25; the elastic member 61 is a compression spring, one end of which is a compression spring. Tie one end of the pressure-receiving member 62 . The elastic member 61 elastically supports the pressure-receiving member 62 to ensure Keep pushing the pressure-receiving member 62 towards the direction of the rod member 25 . The cover 63 is shaped like the side wall of the tube body 20 , so that the energy absorbing member 60 of the present embodiment seems to be disposed on the side wall of one side of the tube body.

When the force of the wrench 10 to rotate the threaded member or the sleeve reaches the set torque, the jumping mechanism 50 will slip/jump out. As shown in FIG. 7 , when the jumping mechanism 50 is actuated, the connecting rod 59 Overcoming the elastic energy of the elastic element 32 and angular displacement, the end of the rod member 25 is deflected and hits the pressure-receiving member 62 of the energy absorbing member 60 , urging the pressure-receiving member 62 and the elastic member 61 to move into the cavity 64 , the elastic member 61 is compressed to absorb the kinetic energy of the rod 25; the energy absorbed by the energy absorbing member 60 during the compressed stroke is equal to the force exerted by the operator, therefore, when the jumping mechanism 50 jumps off, the energy absorbing member During the short time of the compression stroke of the 60 , the inertial force of the operator is absorbed by the elastic member 61 of the energy absorbing member 60 and is not applied to the wrench 10 . Therefore, in a short period of time when the energy absorbing member 60 absorbs energy, the force exerted by the operator does not effectively act on the wrench 10 , thereby reducing the inertia force exerted by the operator acting on the spanner 10 . The energy absorption effect of the energy absorbing member 60 not only reduces the inertial force of the operator pulling the wrench 10 acting on the screw, but also strives for the time for the operator to stop applying force, effectively reducing the phenomenon of excessive rotation of the screw member.

Please refer to FIG. 8, which is the third preferred embodiment of the wrench 10" of the present invention, which also includes: a pipe body 20, a rod 25, a pivot 26, a head 22, an elastic element 32, An adjusting mechanism 40 , a jumping mechanism 50 and an energy absorbing member 60 , the same components are represented by the same component symbols, and the structural features of the components can be referred to the description of the first preferred embodiment, so they will not be repeated.

A jacking member 30 and an elastic element (which is a compression spring) 32 are sequentially disposed in the tube body 20 from front to back. The jacking member 30 is located behind the rod member 25 and can be connected to the tube body Slide within 20. The elastic force of the elastic element 32 acts on the jacking member 30 and is then applied to the jumping mechanism; in addition, a hollow cylindrical member 33 is sleeved on the outer periphery of the jacking member 30 and is connected to the inner wall surface of the tube body 20 Contact, the cylinder member 33 can be made of a softer material, such as copper, which can reduce the frictional force of the jacking member 30 when the tube body is displaced, and the cylinder member 33 has the function of stabilizing the jacking member 30 to prevent jacking The parts shake in the pipe body 20, thereby improving the stability of the wrench and the accuracy of the torque value.

An energy absorbing member 60 is arranged at the end of the rod 25 . In this preferred embodiment, a side surface of the end of the rod 25 is provided with a concave chamber 64; the energy absorbing member 60 is installed in the concave chamber 64, and has an elastic member 61 and a pressure-receiving member 62. The member 62 is arranged in the concave chamber 64 at the end of the rod member 25 and can be displaced in the swing direction of the end of the rod member 25; the elastic member 61 elastically supports the pressure-receiving member 62, and its elastic energy makes the receiving member 62 elastically supported. The pressing member 62 is pushed toward the outer side of the rod. In normal state, the pressing member 62 is protruding out of the concave chamber 64 . When the force of the wrench 10 to rotate the screwing member or the sleeve reaches the set torque, the jumping mechanism 50 will jump out, the end of the rod 25 will swing, and the energy absorbing member 60 will hit the inner wall of the tube body 20 , the pressure-receiving member 62 and the elastic member 61 are displaced into the recess, and the elastic member 61 is compressed to generate a compression stroke. The energy absorbing member 60 absorbs the impact force of the end of the rod 25 to reduce the inertial force of the operator pulling the wrench.

The design of installing the energy absorbing member 60 at the end of the rod 25 in this embodiment can be applied to the first and second preferred embodiments.

In the torque wrench to avoid over-locking provided by the present invention, the energy absorbing member 60 absorbs the force of the end of the rod 25 through its elastic member 61 when the tripping mechanism 50 is actuated. The impact force, when the wrench reaches the set torque value, reduces the situation that the wrench continues to apply torque to the rotating part, and effectively reduces the phenomenon that the operator's inertial force over-rotates the screwed member or the sleeve.

The above-described embodiments are merely illustrative of the present invention and not intended to limit it. For example, the structures of the jumping mechanism and the energy absorbing member are not limited to those shown in the present invention. To sum up, the present invention is the first structure of the same kind of articles, and has the enhancement of many practical effects.

10: Wrench

20: Tube body

22: Head

25: Rods

26: Pivot

30: top holder

32: Elastic element

321: End pieces

322: End pieces

33: Cylinder pieces

40: Adjustment mechanism

41: Fixing parts

411: screw hole

42: Grip

44: Screw

50: Escape Mechanism

52: The first recess

54: Second recess

55: Top Block

60: Energy Absorbing Components

61: Elastic member

62: Pressure parts

63: capping

Claims (5)

A torque wrench for avoiding excessive locking, comprising: a hollow tube body; a rod piece pivoted on the front end of the tube body and can swing, the rear end of the rod piece is located in the tube body; At the front end of the rod; a side wall of the pipe body is provided with an opening corresponding to the end of the rod; a cover is installed on the opening of the pipe body; a jacking piece is located behind the rod and can be displacement along the tube body; a jump-off mechanism is formed between the rear end of the rod and the front end of the jack; an elastic element is arranged in the tube body, and the elastic force of the elastic element acts on the jack The holder is then applied to the jumping mechanism; when the torque wrench reaches the torque setting value, the jumping mechanism will act; the rod is oscillated, and its end swings to the side of the tube body; an energy absorbing member , installed on the wall of the cover, when the jumping mechanism is actuated, the end of the rod hits the energy absorbing member. The torque wrench according to claim 1, wherein: the energy absorbing member has a pressure member and an elastic member, the pressure member is facing the end of the rod and can be displaced in the swing direction of the end of the rod; The elastic member elastically supports the pressure-receiving piece, and its elastic energy pushes the pressure-receiving piece toward the rod; Component systems are compressed. The torque wrench according to claim 1 or 2, wherein: an inner wall of the cover is provided with a recess; the energy absorbing member is installed in the recess. The torque wrench of claim 1, wherein: the energy absorbing member is an elastic member, which generates a compression stroke when absorbing the impact force of the rod. The torque wrench as claimed in claim 1, wherein: an adjusting mechanism is installed on the pipe body and can adjust the elastic force of the elastic element against the jacking piece.

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