Bending wrench

Abstract

The utility model discloses a bending wrench, including handle, stem and bending head, bending head is used for the reequipping various wrench head, handle is equipped with the torsion adjusting assembly and locking assembly, stem is equipped with the top -push spare, bending head can be bent relative to stem, and one end of top -push spare is on bending head, and torsion adjusting assembly is on top -push spare, and torsion adjusting assembly is used for adjusting the torsion value of top -push spare to bending head, and locking assembly is used for unlocking torsion adjusting assembly. The utility model discloses when the torque reaches the preset value through exerting, bending head initiatively bends, forms the obvious physical deformation signal, and clearly prompts operator to stop the force, fundamentally prevents the construction accident such as the thread silk of the torque overrun, bolt pull apart or workpiece damage. Compared with the traditional wrench that depends on the hand feeling or sound prompt, this physical bending action is clear and unambiguous, and the precision and reliability of fastening operation are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of torque wrench equipment, specifically relating to bending wrenches. Background Technology

[0002] A torque wrench is designed based on the bending principles of beams, torsion bars, and coil springs, and can measure the torque acting on a nut. Also called a torque wrench, torque-adjustable wrench, or torque wrench, it is a type of wrench generally divided into three categories: manual torque wrenches, pneumatic torque wrenches, and electric torque wrenches. In existing technology, torque wrenches rely mainly on sound to determine whether the torque value has been reached during use. This may lead to the continued application of torque to the bolted parts after the torque value has been reached, causing excessive torque on the bolted parts and reducing the accuracy of construction. Utility Model Content

[0003] The purpose of this invention is to solve the aforementioned technical problems in the prior art by providing a bending wrench. By unlocking the torque adjustment component through the locking component, the torque adjustment component adjusts the pre-set torque value of the bending head applied by the pusher within the lever. After adjustment, the locking component locks the torque adjustment component. When the applied torque reaches the preset value, the bending head actively bends, generating a significant physical deformation signal that clearly prompts the operator to stop applying force. This fundamentally prevents construction accidents such as thread stripping, bolt breakage, or workpiece damage caused by excessive torque. Compared to traditional wrenches that rely on feel or sound cues, this physical bending action is clear and unambiguous, significantly improving the accuracy and reliability of tightening operations, and is particularly suitable for precision assembly fields with strict torque requirements.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A bending wrench includes a handle, a shaft, and a bending head. The bending head is used to change various wrench heads. The handle contains a torque adjustment component and a locking component. The shaft contains a pusher component. The bending head and shaft can be bent relative to each other. One end of the pusher component rests against the bending head, and the torque adjustment component rests against the pusher component. The torque adjustment component is used to adjust the preset torque value of the pusher component on the bending head. The locking component is used to unlock the torque adjustment component. This invention unlocks the torque adjustment component through the locking component, allowing the torque adjustment component to adjust the preset torque value of the pusher component on the bending head within the shaft. After adjustment, the locking component locks the torque adjustment component. When the applied torque reaches the preset value, the bending head actively bends, forming a significant physical deformation signal that clearly prompts the operator to stop applying force, fundamentally preventing construction accidents such as thread stripping, bolt breakage, or workpiece damage caused by excessive torque. Compared to traditional wrenches that rely on feel or sound cues, this physical bending action is precise and unambiguous, greatly improving the accuracy and reliability of tightening operations, and is especially suitable for precision assembly fields with strict torque requirements.

[0005] Furthermore, the handle includes a handle head, a front part of the handle, a rear part of the handle, and a viewing window. The handle head is connected to the front end of the front part of the handle, and the viewing window connects the front part of the handle and the rear part of the handle. The viewing window design enables visualized torque adjustment, forming a dual verification mechanism with the internal scale. This structure overcomes the limitation of "blind operation" of traditional wrenches, allowing the operator to easily view the preset torque value at any time.

[0006] Furthermore, both the shaft and handle employ a hollow structure, with one end of the shaft inserted into and fixedly connected to the handle. This hollow structure design not only significantly reduces the overall weight of the tool and lowers operator fatigue, but more importantly, it creates a precise and rigid internal channel. This channel ensures that the applied torque is efficiently and with low loss transmitted axially to the bending head, improving transmission efficiency. Simultaneously, it provides a stable and high-precision mounting reference for the complex internal torque adjustment components, effectively controlling the cumulative coaxiality error of each component. This guarantees the linearity and repeatability of torque adjustment and transmission, ultimately improving the tool's measurement accuracy and service life.

[0007] Furthermore, the lever body has an oblong hole, with one end of the torque adjustment component located inside the lever body. A scale is fixedly connected to the torque adjustment component, and the scale is matched with the viewing window. The oblong hole on the lever body provides guidance and limiting space for the movement of the torque adjustment component. The scale is directly fixed to the torque adjustment component, ensuring that the scale position accurately reflects the change in the set torque. Through the carefully designed matching of the viewing window position and the scale stroke, the operator can clearly and unobstructedly read the currently set scale value from outside the tool. This structure realizes the visualization and quantification of the torque preset process, making it easy for the operator to quickly adjust to the required torque level and perform real-time checks and confirmations, greatly improving the efficiency and accuracy of torque setting.

[0008] Furthermore, the jacking component includes a front slider and a slider roller. The front slider is located inside the rod body, and the slider roller is connected to one end of the front slider via a slider shaft pin. The torque adjustment component abuts against the other end of the front slider. The bending head includes a plug-in part and a rotating part. The plug-in part is used to replace various wrench heads. One end of the front slider has an opening, and the rotating part is located in the opening. A bending head washer is provided between the rotating part and the front slider. The rotating part and the front slider achieve relative bending through the bending head pin, and the end of the rotating part abuts against the slider roller. This connection structure is ingeniously designed, achieving decoupling of force transmission and bending action. The slider roller, as a low-friction fulcrum of the rotating part, efficiently converts the preset thrust transmitted by the front slider into torque on the rotating part, i.e., preset torque, while significantly reducing friction loss during the bending process. The bending head pin defines the precise bending axis; the cooperation between the rotating part, the shim, and the front slider opening ensures the stability of the rotating part's position before bending; when the torque exceeds the limit, the rotating part can overcome the preset thrust and bend smoothly around the pin, and the slider roller rolls accordingly, avoiding jamming. This design ensures that the bending action is sensitive and reliable, the trigger torque is accurate, and it can automatically and accurately align after reset.

[0009] Furthermore, the outer wall of the front slider is provided with a mounting cavity, within which a slider ball is installed, resting against the inner wall of the rod. This slider ball design introduces low-friction point contact between the front slider and the inner wall of the rod. The ball can rotate freely within the mounting cavity, transforming the sliding friction between the front slider and the rod into rolling friction. This not only significantly reduces the resistance of the front slider during axial movement within the rod, making torque adjustment smoother and less strenuous, but more importantly, it effectively prevents uneven wear, jamming, or vibration that may occur when the front slider is under high loads. This ensures the smoothness, straightness, and stability of the pushing component's movement, thereby guaranteeing the accuracy and consistency of the preset torque value transmission.

[0010] Furthermore, the torque adjustment assembly includes a rotating sleeve, a lead screw, a first spring, a lead screw seat, and a lead screw slider. The rotating sleeve is movably connected to the other end of the handle. The lead screw seat is fixedly connected to the rod body and the handle by screws. One end of the lead screw is connected to the lead screw seat, and the lead screw slider is movably connected to the other end of the lead screw. By controlling the rotation of the rotating sleeve, the lead screw is driven to rotate, causing the lead screw slider to slide along the direction of the lead screw. An extension tube is provided at the top of the lead screw slider. One end of the first spring abuts against the extension tube, and the other end of the first spring abuts against the pusher. This assembly constitutes a precise, stable, and linearly adjustable torque preset mechanism. The transmission method of the lead screw slider has high mechanical efficiency, enabling the small angle change of the rotating sleeve to be accurately converted into a significant axial displacement of the lead screw slider, achieving precise adjustment of the pre-compression of the first spring. As an elastic element, the compression of the first spring directly determines the thrust applied to the pusher, thereby setting the bending trigger torque. The fixed lead screw seat provides stable support, ensuring the smoothness of the adjustment process and the accuracy of the displacement. This mechanical structure provides a wide range of high-resolution torque setting capabilities, and the set values ​​are stable and reliable, not easily affected by external interference.

[0011] Furthermore, the locking assembly includes a locking cap cover, a locking block, and a locking cap. The locking cap is connected to the locking cap cover, and the locking block is movably connected to the other end of the lead screw. The inner wall of the rotating sleeve has a retaining spring groove, and a retaining spring is located within the retaining spring groove. The inner wall of the rotating sleeve has a platform stage, and the outer wall of the locking block has a platform stage two. Platform stage one rests against the top surface of platform stage two, and retaining spring one rests against the bottom surface of platform stage two. The bottom of the locking block is inserted into the locking cap. The inner wall of the locking cap has a platform stage three, and the bottom of the locking block has a retaining spring groove two, which contains retaining spring two. This structure achieves reliable locking and unlocking of the torque adjustment assembly. The retaining spring one limits the locking block, connecting it to the rotating sleeve; the locking cap is connected to the locking block via retaining spring two, which limits the locking cap. When the locking cap cover is pressed, the locking cap and locking block move axially as a whole, compressing spring two and unlocking the rotating sleeve. After being released, the second spring pushes the locking assembly to reset and lock. The multi-stage steps and retaining spring limit ensure that the locking block has a clear and stable axial position and circumferential constraint in both locked and unlocked states, preventing accidental unlocking or shaking of the locking mechanism due to vibration or impact during tool use, and ensuring the absolute locking safety of the preset torque value.

[0012] Furthermore, the top of the locking block passes through stage one, and limit blocks are distributed circumferentially on the outer side wall of the top of the locking block. Stage one of the stage has a corresponding limit groove, and the limit blocks are located in the limit groove. The cross-section of the other end of the lead screw adopts a polygonal structure, and a limit hole is provided at the center of the locking block. The other end of the lead screw is inserted into the limit hole. The top of the locking block has an insertion hole, and teeth are distributed circumferentially on the inner wall of the insertion hole. The bottom cross-section of the lead screw seat adopts a polygonal structure, and the teeth match the bottom of the lead screw seat. This structure precisely defines two states of the locking component: Unlocked state: When the locking block is pressed upward, the locking block is unlocked. When the rotating sleeve is pulled downward, the rotating sleeve drives the locking block to move downward, and the locking block disengages from the lead screw seat, allowing the rotating sleeve to drive the locking block to rotate freely. The locking block engages with the polygonal cross-section of the end of the lead screw through its internal limit hole, thereby controlling the rotation of the lead screw and adjusting the torque. Locked State: When the locking block is pressed upwards, the ring, locking cap, and locking block all move upwards. Then, the locking cap is released, and the teeth on the top of the locking block precisely engage with the polygonal cross-section at the bottom of the fixed lead screw seat. This achieves circumferential rigid locking between the lead screw, locking block, and lead screw seat. It ensures that in the locked state, the rotating sleeve, lead screw, and related components are completely unable to rotate, effectively preventing the preset torque value from unexpectedly changing due to external interference during operation.

[0013] Furthermore, a second spring is provided on the outer side of the locking cap. The top of the second spring abuts against the bottom of the first retaining spring, and the bottom of the second spring abuts against the edge of the bottom of the locking cap. The inner wall of the locking cap is recessed inward to form an arc-shaped groove. A through hole is provided at the bottom of the locking block. The outer wall of the other end of the lead screw is recessed inward to form an upper arc-shaped groove and a lower arc-shaped groove. A locking cap ball is provided in the through hole. A limit nut is screwed into the bottom of the lead screw. The second spring provides the driving force for the locking assembly to automatically reset from the unlocked state, ensuring reliable locking action. The locking cap ball is a key limiting element: when the locking cap is pressed to the unlocked position, the locking cap ball located in the upper arc-shaped groove moves to a position between the arc-shaped groove and the through hole, unlocking the locking sleeve. Then, the rotating sleeve is pulled down, and the rotating sleeve drives the locking sleeve to move downward, so that the locking cap ball is located between the arc-shaped groove, the through hole, and the lower arc-shaped groove, limiting the axial position of the locking block and maintaining the unlocked position. The torque can be adjusted by rotating the rotating sleeve. After torque adjustment, press the locking cap again, causing the rotating sleeve and locking block to move upwards. The locking cap's ball bearings reset and reposition themselves between the upper arc groove and the through hole, limiting the axial position of the locking block. Simultaneously, the locking block engages with the lead screw seat. Then, release the locking cap to complete the locking process. The locking cap resets under the action of spring two. The locking cap's ball bearings provide axial limiting for the locking block, enhancing the stability of the locking state and preventing the locking block from accidentally dislodging. This limiting mechanism, with its ball bearings and arc groove, offers clear tactile feedback and precise positional feedback, ensuring a secure and reliable locking state. The limiting nut prevents the lead screw from dislodging from the locking block.

[0014] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects: This invention unlocks the torque adjustment component via a locking assembly. The torque adjustment component adjusts the torque value preset on the bending head by a pusher within the adjustment rod. After adjustment, the locking assembly locks the torque adjustment component. When the applied torque reaches the preset value, the bending head actively bends, generating a significant physical deformation signal that clearly prompts the operator to stop applying force. This fundamentally prevents construction accidents such as thread stripping, bolt breakage, or workpiece damage caused by excessive torque. Compared to traditional wrenches that rely on feel or sound cues, this physical bending action is precise and accurate, significantly improving the precision and reliability of tightening operations, and is particularly suitable for precision assembly fields with strict torque requirements.

[0015] The pusher component of this utility model includes a front slider and a slider roller. The front slider is located inside the rod body, and the slider roller is connected to one end of the front slider via a slider shaft pin. A torque adjustment component abuts against the other end of the front slider. The bending head includes a plug-in part and a rotating part. The plug-in part is used to replace various wrench heads. One end of the front slider has an opening, and the rotating part is located in the opening. A bending head washer is provided between the rotating part and the front slider. The rotating part and the front slider are connected by a bending head pin to achieve relative bending. The end of the rotating part abuts against the slider roller. This connection structure is ingeniously designed, achieving decoupling of force transmission and bending action. The slider roller, as a low-friction fulcrum of the rotating part, efficiently converts the preset thrust transmitted by the front slider into torque on the rotating part, i.e., preset torque, while significantly reducing friction loss during the bending process. The bending head pin defines the precise bending axis; the cooperation between the rotating part, the shim, and the front slider opening ensures the stability of the rotating part's position before bending; when the torque exceeds the limit, the rotating part can overcome the preset thrust and bend smoothly around the pin, and the slider roller rolls accordingly, avoiding jamming. This design ensures that the bending action is sensitive and reliable, the trigger torque is accurate, and it can automatically and accurately align after reset.

[0016] In this invention, a second spring is provided on the outer side of the locking cap. The top of the second spring abuts against the bottom of the first retaining spring, and the bottom of the second spring abuts against the edge of the bottom of the locking cap. The inner wall of the locking cap is recessed inward to form an arc-shaped groove. A through hole is provided at the bottom of the locking block. The outer wall of the other end of the lead screw is recessed inward to form an upper arc-shaped groove and a lower arc-shaped groove. A locking cap ball is provided in the through hole. A limit nut is screwed into the bottom of the lead screw. The second spring provides the driving force for the locking assembly to automatically reset from the unlocked state, ensuring reliable locking action. The locking cap ball is a key limiting element: when the locking cap is pressed to the unlocked position, the locking cap ball located in the upper arc-shaped groove moves to a position between the arc-shaped groove and the through hole, unlocking the locking sleeve. Then, the rotating sleeve is pulled down, and the rotating sleeve drives the locking sleeve to move downward, so that the locking cap ball is located between the arc-shaped groove, the through hole, and the lower arc-shaped groove, limiting the axial position of the locking block and maintaining the unlocked position. The torque can be adjusted by rotating the rotating sleeve. After torque adjustment, press the locking cap again, causing the rotating sleeve and locking block to move upwards. The locking cap's ball bearings reset and reposition themselves between the upper arc groove and the through hole, limiting the axial position of the locking block. Simultaneously, the locking block engages with the lead screw seat. Then, release the locking cap to complete the locking process. The locking cap resets under the action of spring two. The locking cap's ball bearings provide axial limiting for the locking block, enhancing the stability of the locking state and preventing the locking block from accidentally dislodging. This limiting mechanism, with its ball bearings and arc groove, offers clear tactile feedback and precise positional feedback, ensuring a secure and reliable locking state. The limiting nut prevents the lead screw from dislodging from the locking block. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the bending wrench in this utility model when it is locked. Figure 2 This is a schematic diagram of the structure of the bending wrench in this utility model when it is unlocked; Figure 3 This is a schematic diagram of the structure of the present invention, showing the wrench head inserted into the bending wrench; Figure 4 This is a schematic diagram of the bending wrench in use according to this utility model; Figure 5 This is a schematic diagram of the structure of the bending wrench in this utility model when it reaches the preset torque; Figure 6 for Figure 2 A schematic diagram of the bottom structure; Figure 7 for Figure 1 A schematic diagram of the bottom structure; Figure 8 for Figure 6 Cross-sectional view of AA in the middle; Figure 9 for Figure 7 Cross-sectional view of BB in the middle; Figure 10 This is an exploded view of the bending wrench in this utility model; Figure 11 This is a schematic diagram of the structure of the top of the rotating sleeve in this utility model; Figure 12 This is a schematic diagram of the locking block in this utility model; Figure 13 This is a schematic diagram of the lead screw in this utility model; Figure 14 This is a schematic diagram of the locking cap in this utility model; Figure 15 This is a schematic diagram of the rotating sleeve in this utility model.

[0018] In the diagram, 1-handle; 2-rod; 3-bending head; 4-torque adjustment assembly; 5-locking assembly; 6-pushing component; 7-handle head; 8-handle front; 9-handle rear; 10-viewing window; 11-scale; 12-front slider; 13-slider roller; 14-slider pin; 15-insertion part; 16-rotating part; 17-bending head washer; 18-bending head pin; 19-mounting cavity; 20-slider ball; 21-rotating sleeve; 22-lead screw; 23-spring one; 24-lead screw seat ; 25-Screw slider; 26-Locking cap; 27-Locking block; 28-Locking cap; 29-Snap ring one; 30-Stage one; 31-Stage two; 32-Stage three; 33-Snap ring two; 34-Limit block; 35-Limit groove; 36-Limit hole; 37-Insertion hole; 38-Gear one; 39-Spring two; 40-Arc groove one; 41-Through hole; 42-Upper arc groove; 43-Lower arc groove; 44-Locking cap ball; 45-Limit nut; 46-Wrench head; 47-Extension tube. Detailed Implementation

[0019] like Figures 1 to 15 As shown, this utility model is a bending wrench, including a handle 1, a shaft 2, and a bending head 3. The bending head 3 is used to replace various wrench heads 46. The handle 1 is provided with a torque adjustment component 4 and a locking component 5. The shaft 2 is provided with a pusher 6. The bending head 3 and the shaft 2 can be bent relative to each other. One end of the pusher 6 abuts against the bending head 3. The torque adjustment component 4 abuts against the pusher 6. The torque adjustment component 4 is used to adjust the preset torque value of the pusher 6 on the bending head 3. The locking component 5 is used to unlock the torque adjustment component 4.

[0020] The handle 1 includes a handle head 7, a handle front part 8, a handle rear part 9, and a viewing window 10. The handle head 7 is connected to the front end of the handle front part 8, and the viewing window 10 connects the handle front part 8 and the handle rear part 9. The viewing window 10 is designed to enable visual torque adjustment, forming a dual verification mechanism with the internal scale. This structure breaks through the limitation of "blind operation" of traditional wrenches, allowing the operator to easily view the preset torque value at any time.

[0021] Both the lever body 2 and the handle 1 adopt a hollow structure, with one end of the lever body 2 inserted into and fixedly connected to the handle 1. This hollow structure design not only significantly reduces the overall weight of the tool and lowers operator fatigue, but more importantly, it creates a precise and rigid internal channel. This channel ensures that the applied torque is efficiently and with low loss transmitted axially to the bending head 3, improving transmission efficiency. Furthermore, it provides a stable and high-precision installation and positioning reference for the complex internal torque adjustment components 4, effectively controlling the cumulative coaxiality error of each component. This ensures the linearity and repeatability of torque adjustment and transmission, ultimately improving the tool's measurement accuracy and service life.

[0022] The lever body 2 has an oblong hole, and one end of the torque adjustment component 4 is located inside the lever body 2. A scale 11 is fixedly connected to the torque adjustment component 4, and the scale is matched with the viewing window 10. The oblong hole on the lever body 2 provides guidance and limiting space for the movement of the torque adjustment component 4. The scale 11 is directly fixed to the torque adjustment component 4, ensuring that the scale position accurately reflects the change in torque. Through the carefully designed matching of the viewing window 10 position with the stroke of the scale 11, the operator can clearly and unobstructedly read the currently set scale value from outside the tool. This structure realizes the visualization and quantification of the torque preset process, facilitating the operator to quickly adjust to the required torque level and perform real-time checks and confirmations, greatly improving the efficiency and accuracy of torque setting.

[0023] The pusher 6 includes a front slider 12 and a slider roller 13. The front slider 12 is located inside the rod body 2. The slider roller 13 is connected to one end of the front slider 12 via a slider shaft pin 14. The torque adjustment component 4 rests against the other end of the front slider 12. The bending head 3 includes a plug part 15 and a rotating part 16. The plug part 15 is used to replace various wrench heads 46. One end of the front slider 12 has an opening, and the rotating part 16 is located in the opening. A bending head washer 17 is provided between the rotating part 16 and the front slider 12. The rotating part 16 and the front slider 12 are bent relative to each other through a bending head pin 18. The end of the rotating part 16 rests against the slider roller 13. This connection structure is ingeniously designed, achieving decoupling of force transmission and bending action. The slider roller 13 serves as a low-friction fulcrum for the rotating part 16, efficiently converting the preset thrust transmitted by the front slider 12 into torque on the rotating part 16, i.e., preset torque, while significantly reducing friction loss during the bending process. The bending head pin 18 defines a precise bending axis; the engagement of the rotating part 16 with the shim and the opening of the front slider 12 ensures the stability of the rotating part 16's position before bending; when the torque exceeds the limit, the rotating part 16 can overcome the preset thrust and bend smoothly around the pin, and the slider roller 13 rolls accordingly, avoiding jamming. This design ensures that the bending action is sensitive and reliable, the trigger torque is accurate, and it can automatically and accurately align after reset.

[0024] The outer wall of the front slider 12 is provided with a mounting cavity 19, and a slider ball 20 is provided in the mounting cavity 19. The slider ball 20 abuts against the inner wall of the rod body 2. The design of the slider ball 20 introduces a low-friction point contact between the front slider 12 and the inner wall of the rod body 2. The ball can rotate freely in the mounting cavity 19, transforming the sliding friction between the front slider 12 and the rod body 2 into rolling friction. This not only greatly reduces the resistance when the front slider 12 moves axially within the rod body 2, making torque adjustment smoother and less effortful, but more importantly, it effectively prevents the front slider 12 from experiencing uneven wear, jamming, or vibration when subjected to high loads, ensuring the smoothness, straightness, and stability of the pusher 6's movement, thereby guaranteeing the accuracy and consistency of the preset torque value transmission.

[0025] The torque adjustment assembly 4 includes a rotating sleeve 21, a lead screw 22, a spring 23, a lead screw seat 24, and a lead screw slider 25. The rotating sleeve 21 is movably connected to the other end of the handle 1. The lead screw seat 24 is fixedly connected to the rod body 2 and the handle 1 by screws. One end of the lead screw 22 is connected to the lead screw seat 24, and the lead screw slider 25 is movably connected to the other end of the lead screw 22. By controlling the rotation of the rotating sleeve 21, the lead screw 22 is driven to rotate, so that the lead screw slider 25 slides along the direction of the lead screw 22. The top of the lead screw slider 25 is provided with an extension tube 47. One end of the spring 23 abuts against the extension tube 47, and the other end of the spring 23 abuts against the pusher 6. This component constitutes a precise, stable, and linearly adjustable torque preset mechanism. The transmission method of the lead screw and slider 25 has high mechanical efficiency, enabling the minute angular changes of the rotating sleeve 21 to be precisely converted into significant axial displacements of the lead screw and slider 25, thus achieving precise adjustment of the pre-compression of the spring 23. As an elastic element, the compression of the spring 23 directly determines the thrust applied to the pusher 6, thereby setting the bending trigger torque. The fixed lead screw seat 24 provides stable support, ensuring the smoothness of the adjustment process and the accuracy of the displacement. This mechanical structure provides a wide range and high resolution torque setting capability, and the set value is stable and reliable, not easily affected by external interference.

[0026] The locking assembly 5 includes a locking cap 26, a locking block 27, and a locking cap 28. The locking cap 28 is connected to the locking cap 26. The locking block 27 is movably connected to the other end of the lead screw 22. The inner wall of the rotating sleeve 21 has a retaining spring groove 1, and a retaining spring 29 is installed in the retaining spring groove 1. The inner wall of the rotating sleeve 21 has a step 30. The outer wall of the locking block 27 has a step 31. The step 30 abuts against the top surface of the step 31, and the retaining spring 29 abuts against the bottom surface of the step 31. The bottom of the locking block 27 is inserted into the locking cap 28. The inner wall of the locking cap 28 has a step 32. The bottom of the locking block 27 has a retaining spring groove 2, and a retaining spring 33 is installed in the retaining spring groove 2. This structure enables reliable locking and unlocking of the torque adjustment assembly 4. Snap ring 29 limits the locking block 27, connecting it to the rotating sleeve 21. Locking cap 28 is connected to locking block 27 via snap ring 33, which also limits its position. Pressing the locking cap cover 26 pushes the locking cap 28 and locking block 27 axially, compressing spring 2 and unlocking the rotating sleeve 21. After release, spring 2 pushes the locking assembly back to its original locking position. The multi-step design and snap ring limiting ensure that locking block 27 has a clear and stable axial position and circumferential constraint in both locked and unlocked states, preventing accidental unlocking or shaking of the locking mechanism due to vibration or impact during tool use, and guaranteeing absolute locking safety at the preset torque value.

[0027] The top of the locking block 27 passes through the platform stage 30. Limiting blocks 34 are distributed around the outer circumference of the top of the locking block 27. The platform stage 30 is provided with a corresponding limiting groove 35. The limiting blocks 34 are located in the limiting groove 35. The cross-section of the other end of the lead screw 22 is polygonal. The center of the locking block 27 is provided with a limiting hole 36. The other end of the lead screw 22 is inserted into the limiting hole 36. The top of the locking block 27 is provided with an insertion hole 37. The inner wall of the insertion hole 37 is circumferentially distributed with teeth 38. The bottom cross-section of the lead screw seat 24 is polygonal. The teeth 38 are matched with the bottom of the lead screw seat 24. This structure precisely defines two states of the locking component 5: Unlocked state: When the locking block 27 is pressed upwards, it unlocks. Pulling down the rotating sleeve 21 causes the locking block 27 to move downwards, disengaging it from the lead screw seat 24. This allows the rotating sleeve 21 to rotate the locking block 27 freely. The locking block 27 engages with the polygonal cross-section at the end of the lead screw 22 through its internal limiting hole 36, thereby controlling the rotation of the lead screw 22 and adjusting its torque. Locked state: When the locking block 27 is pressed upwards, it causes the ring, locking cap 28, and locking block 27 to all move upwards. Then, the locking cap 26 is released, and the tooth 38 at the top of the locking block 27 precisely engages with the polygonal cross-section at the bottom of the fixed lead screw seat 24. This achieves circumferential rigid locking between the lead screw 22, locking block 27, and lead screw seat 24. This ensures that the rotating sleeve 21, lead screw 22 and related components cannot rotate at all when locked, effectively preventing the preset torque value from being unexpectedly changed due to external interference during operation.

[0028] A second spring 39 is provided on the outer side of the locking cap 28. The top of the second spring 39 abuts against the bottom of the first retaining ring 29, and the bottom of the second spring 39 abuts against the edge of the bottom of the locking cap 28. The inner wall of the locking cap 28 is recessed inward to form an arc-shaped groove 40. The bottom of the locking block 27 is provided with a corresponding through hole 41. The outer wall of the other end of the lead screw 22 is recessed inward to form an upper arc-shaped groove 42 and a lower arc-shaped groove 43. A locking cap ball 44 is provided in the through hole 41. A limit nut 45 is screwed into the bottom of the lead screw 22. The second spring 39 provides the driving force for the locking assembly to automatically reset from the unlocked state, ensuring reliable locking action. The locking cap ball 44 is a key limiting element: when the locking cap cover 26 is pressed to the unlocked position, the locking cap ball 44 located in the upper arc groove 42 is displaced to the position between the arc groove 40 and the through hole 41, unlocking the locking sleeve. Then, the rotating sleeve 21 is pulled down, and the rotating sleeve 21 drives the locking sleeve to move downward, so that the locking cap ball 44 is located between the arc groove 40, the through hole 41 and the lower arc groove 43, limiting the axial position of the locking block 27 and maintaining the unlocked position. The torque can be adjusted by rotating the rotating sleeve 21. After the torque adjustment is completed, press the locking cap 26 again, causing the rotating sleeve 21 and locking block 27 to move upward. The locking cap ball 44 resets and repositions between the upper arc groove 42 and the through hole 41, limiting the axial position of the locking block 27. At the same time, the locking block 27 engages with the lead screw seat 24. Then, release the locking cap 26 to complete the locking. The locking cap 26 resets under the action of the second spring 39. The locking cap ball 44 provides axial limiting for the locking block 27, enhancing the stability of the locking state and preventing the locking block 27 from accidentally coming out. This limiting mechanism with ball and arc groove cooperation provides a clear operating feel and precise position feedback, ensuring a firm and reliable locking state. The limiting nut 45 prevents the lead screw 22 from coming out of the locking block 27.

[0029] This invention unlocks the torque adjustment component 4 via the locking component 5. The torque adjustment component 4 adjusts the torque value preset by the pusher 6 inside the adjusting rod 2 on the bending head 3. After adjustment, the locking component 5 locks the torque adjustment component 4. When the applied torque reaches the preset value, the bending head 3 actively bends, forming a significant physical deformation signal that clearly prompts the operator to stop applying force. This fundamentally prevents construction accidents such as thread stripping, bolt breakage, or workpiece damage caused by excessive torque. Compared to traditional wrenches that rely on feel or sound prompts, this physical bending action is clear and unambiguous, significantly improving the accuracy and reliability of tightening operations, and is especially suitable for precision assembly fields with strict torque requirements.

[0030] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A bending wrench, characterized in that: The device includes a handle, a shaft, and a bending head. The bending head is used to change various wrench heads. The handle contains a torque adjustment component and a locking component. The shaft contains a pusher component. The bending head and the shaft can be bent relative to each other. One end of the pusher component abuts against the bending head, and the torque adjustment component abuts against the pusher component. The torque adjustment component is used to adjust the preset torque value of the pusher component on the bending head. The locking component is used to unlock the torque adjustment component. The torque adjustment component includes a rotating sleeve, a lead screw, a spring, a lead screw seat, and a lead screw slider. The rotating sleeve is movably connected to the other end of the handle. The lead screw seat is fixedly connected to the shaft and the handle by screws. One end of the lead screw is connected to the lead screw seat, and the lead screw slider is movably connected to the other end of the lead screw. By controlling the rotation of the rotating sleeve, the lead screw is driven... The lever rotates, causing the lead screw slider to slide along the direction of the lead screw. The top of the lead screw slider is provided with an extension tube. One end of the first spring abuts against the extension tube, and the other end of the first spring abuts against the pusher. The locking assembly includes a locking cap, a locking block, and a locking cap. The locking cap is connected to the locking cap cover. The locking block is movably connected to the other end of the lead screw. The inner wall of the rotating sleeve is provided with a retaining spring groove, and a retaining spring is provided in the retaining spring groove. The inner wall of the rotating sleeve is provided with a platform stage one. The outer wall of the locking block is provided with a platform stage two. Platform stage one abuts against the top surface of platform stage two, and retaining spring one abuts against the bottom surface of platform stage two. The bottom of the locking block is inserted into the locking cap. The inner wall of the locking cap is provided with a platform stage three. The bottom of the locking block is provided with a retaining spring groove two, and retaining spring two is provided in the retaining spring groove two.

2. The bending wrench according to claim 1, characterized in that: The handle includes a handle head, a handle front, a handle rear, and a viewing window. The handle head is connected to the front end of the handle front, and the viewing window is connected between the handle front and the handle rear.

3. The bending wrench according to claim 1, characterized in that: Both the rod and the handle are hollow structures, with one end of the rod inserted into the handle and fixedly connected.

4. The bending wrench according to claim 2, characterized in that: The rod body has an oblong hole, one end of the torque adjustment component is located inside the rod body, and a scale is fixedly connected to the torque adjustment component. The scale is matched with the viewing window.

5. The bending wrench according to claim 1, characterized in that: The jacking component includes a front slider and a slider roller. The front slider is located inside the rod body. The slider roller is connected to one end of the front slider via a slider shaft pin. The torque adjustment component abuts against the other end of the front slider. The bending head includes a plug-in part and a rotating part. The plug-in part is used to replace various wrench heads. One end of the front slider has an opening. The rotating part is located in the opening. A bending head washer is provided between the rotating part and the front slider. The rotating part and the front slider are bent relative to each other through a bending head pin. The end of the rotating part abuts against the slider roller.

6. The bending wrench according to claim 5, characterized in that: The outer wall of the front slider is provided with a mounting cavity, and a slider ball is provided in the mounting cavity, the slider ball abutting against the inner wall of the rod body.

7. The bending wrench according to claim 1, characterized in that: The top of the locking block passes through the first stage of the platform. Limiting blocks are distributed circumferentially on the outer side wall of the top of the locking block. The first stage of the platform is provided with a corresponding limiting groove. The limiting blocks are located in the limiting groove. The cross-section of the other end of the lead screw is polygonal. A limiting hole is provided at the center of the locking block. The other end of the lead screw is inserted into the limiting hole. The top of the locking block is provided with an insertion hole. The inner wall of the insertion hole is circumferentially distributed with teeth. The bottom cross-section of the lead screw seat is polygonal. The teeth match the bottom of the lead screw seat.

8. The bending wrench according to claim 1, characterized in that: The locking cap has a second spring on its outer side. The top of the second spring abuts against the bottom of the first retaining spring, and the bottom of the second spring abuts against the edge of the bottom of the locking cap. The inner wall of the locking cap is recessed inward to form an arc-shaped groove. The bottom of the locking block is provided with a through hole. The outer wall of the other end of the lead screw is recessed inward to form an upper arc-shaped groove and a lower arc-shaped groove. The through hole is provided with a locking cap ball. The bottom of the lead screw is screwed into a limit nut.

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