Break-over torque wrench

Abstract

A break-over torque wrench, relating to the field of torque tools. The break-over torque wrench comprises a handle (1) and a torsion bar (2), wherein the torsion bar (2) is located at one end of the handle (1), a torsion transmission structure is arranged on the torsion bar (2), the torsion bar (2) and the handle (1) are rotatably connected around a rotation axis, and the rotation axis is parallel to the axis of torque generated by the torsion transmission structure. The break-over torque wrench further comprises a threshold mechanism (3), wherein the threshold mechanism (3) is used for controlling the rotation or fixed state of the torsion bar (2) and the handle (1) by means of the magnitude of torque borne by the torsion transmission structure.

Description

Bending torque wrench Technical Field

[0001] The present application relates to the field of torque tools, and in particular to a bending torque wrench. Background Art

[0002] A wrench is a commonly used installation and disassembly tool. It is a hand tool that uses the principle of leverage to twist bolts, screws, nuts and other threaded fasteners that tighten the openings or holes of bolts or nuts.

[0003] Common low-torque fixed-torque wrenches are traditional mechanical and electronic torque wrenches, which can withstand limited maximum torques. In related technology, one electronic torque wrench is equipped with an alarm device that sounds when the torque is excessive. However, in noisy working environments, the operator may not be able to hear the alarm in time, which can cause overload damage to the wrench. Summary of the Invention

[0004] In order to improve the above problems, the present application provides a bending torque wrench.

[0005] The bending torque wrench provided in this application adopts the following technical solution.

[0006] A bending torque wrench includes a handle and a torsion bar, wherein the torsion bar is located at one end of the handle and is provided with a torque transmission structure. The torsion bar and the handle are rotatably connected around a rotation axis, and the rotation axis is parallel to the axis of the torque generated by the torque transmission structure. The torsion bar also includes a threshold mechanism, which is used to control the rotation or fixed state of the torsion bar and the handle according to the torque size borne by the torque transmission structure.

[0007] By adopting the above technical solution, when the operator holds the wrench and applies torque, when the torque reaches a certain level, the handle and torque bar, which were originally in a relatively stable state, will move significantly. The operator can clearly feel that the torque has exceeded the threshold, thereby achieving the effect of overload warning.

[0008] Preferably, the threshold mechanism includes a thrust plug, which is slidably arranged in the handle, and one end of the torsion bar is provided with a matching groove for inserting the thrust plug, and the depth direction of the matching groove is perpendicular to the rotation axis of the torsion bar. The threshold mechanism also includes a control component for controlling the movement of the thrust plug.

[0009] By adopting the above technical solution, when the thrust plug is inserted into the matching groove, the thrust plug forms a rotation stop for the torsion bar, and the torsion bar cannot be easily rotated relative to the handle.

[0010] Preferably, the thrust plug includes a piston body and a transition ball, the piston body slides relative to the handle, the transition ball is located on the side of the piston body facing the torsion bar, and the torsion bar is connected to two mating rollers at one end close to the thrust plug and rotates around the corresponding rotation axis, the rotation axis is parallel to the rotation axis of the torsion bar relative to the handle, the mating groove is formed between the two mating rollers, and the transition ball extends into the mating groove and abuts against the wheel surfaces of the two mating rollers.

[0011] By adopting the above technical solution, when the torsion bar and the handle rotate relative to each other, the transition ball and the matching roller roll and abut against each other, which improves the smoothness of the contact process between the two and reduces the wear of the torsion bar and the thrust plug.

[0012] Preferably, the control assembly includes a thrust spring, which is located at the end of the thrust plug away from the torsion rod. One end of the thrust spring is connected to the handle, and the other end is connected to the piston body. The deformation direction of the thrust spring is consistent with the sliding direction of the thrust plug.

[0013] By adopting the above technical solution, the thrust spring itself has a critical deformation value and can always generate thrust on the thrust plug. When the thrust force received by the thrust plug from the torsion bar is not sufficient to cause a significant contraction of the thrust spring, the thrust plug does not disengage from the mating groove, and the relative state of the torsion bar and the handle is stable. When the thrust force received by the thrust plug squeezes the transition ball out of the mating groove, the torsion bar can rotate relative to the handle.

[0014] Preferably, a limited angle pin is fixedly connected to the handle, and a limiting hole for the limited angle pin to pass through is provided on the torsion bar.

[0015] By adopting the above technical solution, the angle limiting pin can only move within the space of the limiting hole, that is, there is a certain maximum relative rotation amplitude between the torsion bar and the handle.

[0016] Preferably, an adjustment sleeve is slidably provided in the handle, the sliding direction of the adjustment spring is consistent with the sliding direction of the thrust plug, the end of the thrust spring away from the thrust plug is connected to the adjustment sleeve, and the control component also includes an adjustment member, which is used to change the position of the adjustment sleeve relative to the handle.

[0017] By adopting the above technical solution, the position of the adjustment sleeve changes with the change of the base point position of the spring, and the initial thrust value of the spring on the thrust plug can also be adjusted accordingly. The operator can thereby adjust the threshold value that can cause the torsion bar and handle to rotate to adapt to different working conditions.

[0018] Preferably, the adjusting member is an adjusting screw, which is threadedly connected to the handle, the axis of the adjusting screw is parallel to the sliding direction of the adjusting bushing, and the end of the adjusting screw abuts against the end of the adjusting bushing away from the thrust spring.

[0019] By adopting the above technical solution, the adjusting screw changes the relative position between itself and the handle through the threaded pair, thereby changing the degree of advancement of the adjusting bushing, thereby changing the contraction amount of the adjusting spring, so that its own elastic force also changes.

[0020] Preferably, the control assembly further comprises a setscrew, which is threadedly connected to the handle and is located on the side of the adjusting screw away from the adjusting bushing, the end face of the setscrew abuts against the end face of the adjusting screw, a hexagonal groove is provided in the middle of one end of the adjusting screw facing the setscrew, an operating channel is provided through the setscrew along its own axial direction, an adjusting threaded hole is provided at the end of the handle away from the torsion bar, the adjusting screw and the setscrew are both located in the adjusting threaded hole, and a closing cover for closing the adjusting threaded hole is detachably connected to the handle.

[0021] By adopting the above technical solution, after the adjusting screw and the set screw are abutted and tightened, the states of both are stabilized and strengthened, the adjusting screw is not easy to change position, and the state stability of the adjusting bushing is improved at this time.

[0022] Preferably, the adjusting member is an adjusting nut, which is located in the handle and rotatably connected to the handle. The adjusting bushing is fixedly connected to an adjusting screw, which is coaxially threaded with the adjusting nut. An operating hole is provided on the side wall of the handle, and one side of the adjusting nut extends out of the operating hole.

[0023] Preferably, the outer peripheral surface of the adjusting nut is formed with a plurality of anti-slip ridges, the length direction of the anti-slip ridges is parallel to the axis of the adjusting nut, and an anti-accidental touch cover is slidably provided on the handle, the sliding direction of the anti-accidental touch cover is parallel to the axis of the adjusting nut, the anti-accidental touch cover is used to close the operating hole, and a stop ridge is fixedly connected to the anti-accidental touch cover, the length direction of the stop ridge is parallel to the sliding direction of the anti-accidental touch cover, and the gap between two adjacent anti-slip ridges is for the stop ridge to penetrate.

[0024] By adopting the above technical solution, the position adjustment of the adjusting bushing is more convenient and the adjustment efficiency is improved.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. Through the relative rotation of the handle and torque bar and the setting of the threshold mechanism, when the operator holds the wrench and applies torque, when the torque reaches a certain level, the handle and torque bar, which were originally relatively stable, will experience significant movement. The operator can clearly feel that the torque has exceeded the threshold, thus achieving the effect of overload warning;

[0027] 2. By setting the adjusting screw, the adjusting screw changes its relative position to the handle through the threaded pair. The degree of advancement of the adjusting bushing is different, the contraction amount of the adjusting spring changes, and its own elastic force also changes. The threshold value of the handle and the torsion bar sliding significantly relative to each other will also change. The operator can adaptively adjust the threshold mechanism according to the working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic cross-sectional view of the structure of a bending torque wrench in the first embodiment of the present application.

[0029] FIG2 is a schematic diagram of the three-dimensional structure of the bending torque wrench in the first embodiment of the present application.

[0030] FIG3 is a schematic diagram illustrating the force-bearing structure of the transition sphere and the matching roller in the first embodiment of the present application.

[0031] FIG4 is a schematic cross-sectional view illustrating the structure of the torsion bar rotating relative to the handle in the first embodiment of the present application.

[0032] FIG5 is an exploded schematic diagram illustrating the structure of the adjusting screw and the set screw in the first embodiment of the present application.

[0033] FIG6 is a schematic cross-sectional view showing the structure of the anti-inadvertent touch cover at the handle before and after sliding in the second embodiment of the present application.

[0034] FIG7 is a cross-sectional schematic diagram illustrating the matching structure of the anti-rotation edge and the anti-slip ridge in the second embodiment of the present application.

[0035] Explanation of the accompanying drawings: 1. Handle; 11. Adjusting threaded hole; 12. Operating hole; 13. Angle limiting pin; 14. Closing cover; 2. Torsion bar; 21. Ratchet tenon; 22. Limiting hole; 23. Matching groove; 3. Threshold mechanism; 31. Thrust plug; 311. Piston body; 312. Transition ball; 32. Matching roller; 33. Thrust spring; 34. Adjusting bushing; 35. Adjusting screw; 36. Set screw; 361. Operating channel; 37. Adjusting nut; 371. Anti-slip ridge; 38. Adjusting screw; 39. Anti-accidental touch cover; 391. Anti-rotation ridge. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to Figures 1-7.

[0037] Example 1:

[0038] The embodiment of the present application discloses a bending torque wrench, as shown in Figures 1 and 2, comprising a handle 1 and a torsion bar 2, wherein the torsion bar 2 is located at one end of the handle 1 and the two are rotatably connected. A torque transmission structure is provided on the torsion bar 2, and the rotation axis of the torsion bar 2 relative to the handle 1 is parallel to the axis of the torque generated by the torque transmission structure. The bending torque wrench also includes a threshold mechanism 3, which is used to control the rotation or fixed state of the torsion bar 2 and the handle 1 based on the torque magnitude borne by the torque transmission structure, that is, when the torque is small, the relative state of the torsion bar 2 and the handle 1 is relatively stable, and the length directions of the two are basically consistent, and when the torque is too large, the torsion bar 2 will rotate significantly relative to the handle 1.

[0039] As shown in Figures 1, 2, and 3, in this embodiment, the torque transmission structure comprises a ratchet tenon 21, located at the end of the torsion bar 2 facing away from the handle 1. The threshold mechanism 3 comprises a thrust plug 31 and a control assembly. The thrust plug 31 is located within the handle 1 and comprises a piston body 311 and a transition ball 312. The piston body 311 slides relative to the handle 1 along its length. The transition ball 312 is positioned on the side of the piston body 311 facing the torsion bar 2 and abuts against the end of the piston body 311. The control assembly is used to control the movement of the thrust plug 31 and comprises a thrust spring 33. The thrust spring 33 is located at the end of the thrust plug 31 facing away from the torsion bar 2. One end of the thrust spring 33 is connected to the handle 1, and the other end is connected to the piston body 311. The deformation direction of the thrust spring 33 aligns with the sliding direction of the thrust plug 31. In its natural state, the thrust spring 33 applies a thrust force to the thrust plug 31 toward the torsion bar 2. The end of the torsion bar 2, near the thrust plug 31, is rotatably connected to two mating rollers 32. The rotation axis is parallel to the rotation axis of the torsion bar 2 relative to the handle 1. A mating groove 23 is formed between the two mating rollers 32. The transition ball 312 extends into the mating groove 23 and abuts the wheel surfaces of the two mating rollers 32. When the torsion bar 2 tends to rotate, one of the mating rollers 32 generates a thrust against the transition ball 312. Due to the curved contact surface between the two, a relative rolling tendency is generated between the mating roller 32 and the transition ball 312.

[0040] As shown in Figures 1, 3 and 4, a limited angle pin 13 is fixedly connected to the handle 1, and a limiting hole 22 is provided on the torsion bar 2 for the limiting angle pin 13 to pass through. The depth direction of the limiting hole 22 and the length direction of the limiting angle pin 13 are parallel to the rotation axis of the torsion bar 2, and the outline of the limiting hole 22 is a circular arc centered on the rotation axis of the torsion bar 2. When the length direction of the handle 1 is consistent with the length direction of the torsion bar 2, the limiting angle pin 13 abuts against one end of the hole wall of the limiting hole 22. When the torsion bar 2 rotates 16°, the limiting angle pin 13 abuts against the other end of the hole wall of the limiting hole 22. The handle 1 itself is an alloy steel rod-shaped member, and a sleeve made of TPU plastic material is sleeved and fixed on its outside to improve the operator's hand comfort when holding the handle 1.

[0041] As shown in Figures 1, 2, and 5, an adjustment bushing 34 is slidably disposed within the handle 1, with its sliding direction aligned with that of the thrust plug 31. The end of the thrust spring 33 facing away from the thrust plug 31 is fixedly connected to one end of the adjustment bushing 34. The control assembly also includes an adjustment member for changing the position of the adjustment bushing 34 relative to the handle 1. An adjustment threaded hole 11 is defined at the end of the handle 1 facing away from the torsion bar 2. The length of the adjustment threaded hole 11 aligns with that of the handle 1. The adjustment member is an adjustment screw 35, which is positioned within the adjustment threaded hole 11 and threadedly connected to the handle 1. The control assembly also includes a set screw 36, which is also positioned within the adjustment threaded hole 11 and threadedly connected to the handle 1. The set screw 36 is located on the side of the adjustment screw 35 facing away from the adjustment bushing 34. One end of the adjustment screw 35 abuts the end face of the adjustment bushing 34, while the other end abuts the end face of the set screw 36. The set screw 36 has an operating channel extending axially therethrough. The adjusting screw 35 has a hexagonal groove in the middle of one end thereof facing the set screw 36. A torque groove is provided on the end face of the set screw 36 facing away from the adjusting screw 35. This torque groove cooperates with a dedicated torque tool for the set screw 36 to control the rotation of the set screw 36. Furthermore, the dedicated torque tool for the set screw 36 is hollow, allowing the operator to insert a hexagonal wrench through the dedicated torque tool and the operating channel, and then into the hexagonal groove of the adjusting screw 35, thereby simultaneously controlling the adjusting screw 35 and the set screw 36, ensuring a tight abutment between the two screws. Neither screw can be easily shifted relative to the handle 1, and the position of the adjusting bushing 34 is more stable. The end of the handle 1 facing away from the torsion bar 2 is threadedly connected to a closure cap 14 for sealing the adjusting threaded hole 11.

[0042] The implementation principle of a bending torque wrench in the embodiment of the present application is:

[0043] As shown in Figures 1, 3, and 4, a force-application point projection is provided in the middle of the handle 1. During use, a thrust is applied to the force-application point projection, thereby generating a torque on the ratchet tenon 21. The torque is calculated as: T = F * L, where F is the thrust applied to the force-application point projection and L is the distance between the force-application point projection and the ratchet tenon 21. As the torsion bar 2 rotates, one of the mating rollers 32 compresses the transition ball 312. The compressive force is P. Decomposing P, its component along the length of the handle 1 is P2. P2 is the force that compresses and deforms the adjustment spring. In the direction of movement of the thrust plug 31, the resultant force acting on the transition ball 312 is the vector sum of the thrust of the adjustment spring and P2. As F gradually increases, when the direction of the resultant force acting on the transition ball 312 is toward the adjustment spring, the adjustment spring will further compress and deform. This causes the torsion bar 2 and handle 1 to suddenly and significantly rotate relative to each other, which the operator can instantly sense, thus achieving the purpose of an overload alarm. According to production requirements or specific conditions under different working conditions, the position of the adjusting bushing 34 is changed by adjusting the screw 35 to change the initial compression amount and initial thrust of the adjusting spring, thereby changing the threshold torque that triggers the torsion bar 2 to rotate relative to the handle 1.

[0044] Example 2:

[0045] As shown in Figures 6 and 7, this embodiment differs from the previous embodiments in that the adjusting member in this embodiment is an adjusting nut 37, which is located within and rotatably connected to the handle 1. An adjusting screw 38 is coaxially fixedly connected to the end of the adjusting bushing 34 remote from the adjusting spring. The adjusting screw 38 is coaxially threadedly connected to the adjusting nut 37. An operating hole 12 is defined in the sidewall of the handle 1, and one side of the adjusting nut 37 extends out of the operating hole 12. The outer circumference of the adjusting nut 37 is formed with several anti-slip ridges 371, the length of which is aligned with the axis of the adjusting nut 37. The operator can directly push the adjusting nut 37 from the outside of the handle 1 to rotate it. The adjusting nut 37 then controls the movement of the adjusting screw 38 and adjusting bushing 34 along the length of the handle 1 via a threaded pair. A sliding anti-touch cover 39 is provided on the handle 1, sliding parallel to the axis of the adjusting nut 37. This anti-touch cover 39 controls the opening or closing of the operating hole 12. When the operating hole 12 is closed by the anti-accidental touch cover 39, the anti-accidental touch operating cover is temporarily fixed to the handle 1 by a snap connection. A stop rib 391 is integrally formed on the side of the anti-accidental touch cover 39 facing the adjustment nut 37. The length of the stop rib 391 is parallel to the sliding direction of the anti-accidental touch cover 39. When the anti-accidental touch cover 39 closes the operating hole 12, the gap between two adjacent anti-slip ribs 371 allows the stop rib 391 to penetrate. In this state, the adjustment nut 37 cannot be easily rotated.

[0046] The implementation principle of the bending torque wrench of the second embodiment of the present application is:

[0047] Compared with the first embodiment, the present embodiment does not require auxiliary tools to adjust the position of the adjusting bushing 34 and does not require opening the closing cover 14, so it is faster and more convenient, shortening the operation time when adjusting the wrench alarm torque threshold.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A bending torque wrench, comprising a handle (1) and a torsion bar (2), wherein the torsion bar (2) is located at one end of the handle (1), and a torque transmission structure is provided on the torsion bar (2), characterized in that: The torsion bar (2) and the handle (1) are rotatably connected around a rotation axis, and the rotation axis is parallel to the axis of the torque generated by the torque transmission structure. The bending torque wrench also includes a threshold mechanism (3), and the threshold mechanism (3) is used to control the rotation or fixed state of the torsion bar (2) and the handle (1) based on the torque size borne by the torque transmission structure.

2. The bending torque wrench according to claim 1, characterized in that: The threshold mechanism (3) includes a thrust plug (31) which is slidably arranged in the handle (1). One end of the torsion bar (2) is provided with a matching groove (23) for inserting the thrust plug (31). The depth direction of the matching groove (23) is perpendicular to the rotation axis of the torsion bar (2). The threshold mechanism (3) also includes a control component for controlling the movement of the thrust plug (31).

3. The bending torque wrench according to claim 2, wherein: The thrust plug (31) comprises a piston body (311) and a transition ball (312). The piston body (311) slides relative to the handle (1). The transition ball (312) is located on the side of the piston body (311) facing the torsion bar (2). One end of the torsion bar (2) close to the thrust plug (31) rotates around a corresponding rotation axis and is connected to two matching rollers (32). The rotation axis is parallel to the rotation axis of the torsion bar (2) relative to the handle (1). The matching groove (23) is formed between the two matching rollers (32). The transition ball (312) extends into the matching groove (23) and abuts against the wheel surfaces of the two matching rollers (32).

4. The bending torque wrench according to claim 3, characterized in that: The control assembly includes a thrust spring (33), which is located at one end of the thrust plug (31) away from the torsion bar (2), one end of the thrust spring (33) is connected to the handle (1), and the other end is connected to the piston body (311), and the deformation direction of the thrust spring (33) is consistent with the sliding direction of the thrust plug (31).

5. The bending torque wrench according to claim 3, characterized in that: A limited angle pin (13) is fixedly connected to the handle (1), and a limiting hole (22) for the limited angle pin (13) to pass through is provided on the torsion bar (2).

6. The bending torque wrench according to claim 4, characterized in that: An adjusting sleeve (34) is slidably provided in the handle (1), and the sliding direction of the adjusting sleeve is consistent with the sliding direction of the thrust plug (31). One end of the thrust spring (33) away from the thrust plug (31) is connected to the adjusting sleeve (34). The control assembly further comprises an adjusting member, which is used to change the position of the adjusting sleeve (34) relative to the handle (1).

7. The bending torque wrench according to claim 6, characterized in that: The adjusting member is an adjusting screw (35), which is threadedly connected to the handle (1), the axis of the adjusting screw (35) is parallel to the sliding direction of the adjusting bushing (34), and the end of the adjusting screw (35) abuts against the end of the adjusting bushing (34) away from the thrust spring (33).

8. The bending torque wrench according to claim 7, characterized in that: The control assembly further comprises a set screw (36), the set screw (36) being threadedly connected to the handle (1) and being located on the side of the adjusting screw (35) away from the adjusting bushing (34), the end face of the set screw (36) being in contact with the end face of the adjusting screw (35), the adjusting screw (35) being provided with a hexagonal groove in the middle of one end thereof facing the set screw (36), the set screw (36) being provided with an operating channel along its own axial direction, the end of the handle (1) being provided with an adjusting threaded hole (11), the adjusting screw (35) and the set screw (36) being both located in the adjusting threaded hole (11), and the handle (1) being detachably connected with a closing cover (14) for closing the adjusting threaded hole (11).

9. The bending torque wrench according to claim 6, characterized in that: The adjusting member is an adjusting nut (37), the adjusting nut (37) is located in the handle (1) and is rotatably connected to the handle (1), the adjusting bushing (34) is fixedly connected to an adjusting screw (38), the adjusting screw (38) is coaxially threadedly connected to the adjusting nut (37), an operating hole (12) is opened on the side wall of the handle (1), and one side of the adjusting nut (37) extends out of the operating hole (12).

10. The bending torque wrench according to claim 9, characterized in that: The outer peripheral surface of the adjusting nut (37) is formed with a plurality of anti-skid ridges (371), the length direction of the anti-skid ridges (371) is parallel to the axis of the adjusting nut (37), an anti-accidental touch cover (39) is slidably provided on the handle (1), the sliding direction of the anti-accidental touch cover is parallel to the axis of the adjusting nut (37), the anti-accidental touch cover (39) is used to close the operating hole (12), a stop ridge (391) is fixedly connected to the anti-accidental touch cover (39), the length direction of the stop ridge (391) is parallel to the sliding direction of the anti-accidental touch cover (39), and the gap between two adjacent anti-skid ridges (371) is for the stop ridge (391) to be inserted.

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