New torque wrench

Abstract

A torque wrench, comprising a flat tube (1), wherein a square tenon (2) is arranged at one end of the flat tube (1), a large arm (3) and a small arm (5) are sequentially and rotationally arranged in the flat tube (1) on the side close to the square tenon (2), the large arm (3) is connected to the square tenon (2) and swings along the axis of the square tenon (2), an arc-shaped groove (4) is formed on the side of the large arm (3) close to the square tenon (2), a large arm positioning pin (13) matching the arc-shaped groove (4) is fixedly arranged on the flat tube (1), a tightening assembly (6) is arranged between the large arm (3) and the square tenon (2) for improving the tightness between the large arm (3) and the square tenon (2), a connecting assembly (7) is arranged between the large arm (3) and the small arm (5) for improving the smoothness of rotation of the small arm (5), and a torque adjusting assembly (8) is arranged in the flat tube (1). The large arm is connected to the square tenon (2) by means of the arc-shaped groove (4) and the tightening assembly (6), the force bearing point of the square tenon (2) is the rotating fulcrum of the large arm (3), and the torque output value of the square tenon (2) is not affected by a force applied to the flat tube by a worker, thereby improving the torque accuracy of the torque wrench.

Description

A new type of torque wrench Technical Field

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

[0002] A torque wrench is a general term for hand-held screw tools, which are used to apply tightening torque to connecting elements such as screws or nuts to ensure the required clamping force between the components to be connected.

[0003] Currently commonly used torque wrenches generally have a kingpin as a fulcrum, using the principle of leverage to amplify force. However, when in use, the axial position of the force application point has a greater influence on the torque. The closer to the head, the greater the torque. This makes the force application position of the torque wrench have a greater influence on the torque accuracy.

[0004] Therefore, it is necessary to provide a new torque wrench that can achieve a torque accuracy that is not affected by the force application position of the wrench. Summary of the Invention

[0005] In order to avoid the influence of the force application point on the torque of the wrench and improve the torque accuracy of the torque wrench, the present application provides a new torque wrench.

[0006] This application provides a new torque wrench, which adopts the following technical solution:

[0007] A novel torque wrench comprises a flat tube, one end of which is provided with a square tenon, a large arm and a small arm being rotatably provided in sequence on the side of the flat tube close to the square tenon, the large arm being connected to the square tenon and swinging along the axis of the square tenon, an arc-shaped groove being provided on the side of the large arm close to the square tenon, a large arm locating pin which cooperates with the arc-shaped groove being fixedly provided on the flat tube, one end of the large arm locating pin being located in the arc-shaped groove and sliding relatively therein, a tightening assembly being provided between the large arm and the square tenon, the tightening assembly being used to improve the tightness between the large arm and the square tenon;

[0008] A connecting assembly is provided between the upper arm and the lower arm, and the connecting assembly is used to improve the smoothness of the rotation of the lower arm;

[0009] A torque adjustment component is provided in the flat tube, and the torque adjustment component is used to adjust the torque of the wrench.

[0010] By adopting the above technical solution, the arm is connected to the square tenon through an arc groove and a tightening assembly. The arm in the torque wrench has no fulcrum. During operation, the force point of the square tenon serves as the rotation fulcrum of the arm. The force applied by the operator to the flat tube will not affect the arm, and therefore will not affect the torque output value of the square tenon, thereby improving the torque accuracy of the torque wrench. At the same time, the torque adjustment assembly facilitates the adjustment of the torque of the torque wrench, improving the applicability of the torque wrench.

[0011] Preferably, the square tenon is a toothed square tenon, and the tightening assembly includes a mounting groove opened at one end of the arc-shaped groove on the upper arm, a wedge-shaped support tooth slidably arranged in the mounting groove, and a support tooth spring connected between the wedge-shaped support tooth and the inner wall of the mounting groove, the wedge-shaped support tooth is meshed with the square tenon, and the wedge-shaped support tooth adopts an oblique wedge design.

[0012] By adopting the above technical solution, taking the clockwise rotation of the flat tube as an example, force is applied to the flat tube downward to drive the flat tube to rotate clockwise, and the square tenon is subjected to a counterclockwise reaction force. The design of the inclined wedge makes it possible that the more force is applied, the tighter the teeth between the wedge-shaped support teeth and the square tenon are engaged, thereby effectively preventing the square tenon from slipping during the force application process. At the same time, it can also drive the upper arm to swing counterclockwise. When the square tenon retracts clockwise, the teeth of the square tenon will push the wedge-shaped support teeth to move toward the large end of the wedge, thereby effectively ensuring the function of the ratchet. At the same time, due to the effect of the support teeth spring connected to the support teeth, once the square tenon rotates in the opposite direction, the support teeth spring quickly pushes the wedge-shaped support teeth into the small angle of the inclined wedge, and then engages with the teeth of the square tenon, further improving the stability of the structure.

[0013] Preferably, the connecting assembly includes a straight slot opened at one end of the upper arm close to the lower arm, and a lower arm swing pin is provided at the end of the lower arm close to the upper arm, and the lower arm swing pin is slidably arranged in the straight slot.

[0014] By adopting the above technical solution, during the rotation of the forearm, the forearm swing pin slides along the straight groove, thereby ensuring that the forearm rotation drives the upper arm to swing more smoothly, thereby improving the stability of the structure.

[0015] Preferably, the torque adjustment assembly includes a sliding core structure and a scale adjustment structure, a spring is provided between the sliding core structure and the scale adjustment structure, a connecting rod is provided between the end of the sliding core structure away from the spring and the small arm, and the scale adjustment structure drives the spring and the sliding core structure to rotate the small arm in the flat tube;

[0016] An adjusting slot is provided on the small arm, an adjusting screw is provided in the adjusting slot, and the adjusting screw is used to adjust the angle between the connecting rod and the axis of the flat tube.

[0017] By adopting the above technical solution, the scale adjustment structure moves inward, causing the spring to compress, thereby driving the sliding core structure to move inward, and the small arm to swing through the connecting rod. During the swing of the small arm, the angle between the connecting rod and the wrench axis is adjusted, so that the component of the spring force acting on the connecting rod located perpendicular to the axis changes, thereby adjusting the torque of the wrench. At the same time, the angle between the connecting rod and the wrench axis can be adjusted by lengthening or shortening the adjustment screw, thereby adjusting the wrench torque, further improving the overall applicability of the device.

[0018] Preferably, a locking structure is provided in the adjusting slot, and the locking structure is used to prevent the adjusting screw from loosening.

[0019] By adopting the above technical solution, the locking structure is used to effectively prevent the adjusting screw from loosening after being hit, thereby further improving the stability of this part.

[0020] Preferably, the locking structure includes a locking screw arranged in the adjusting slot, and a locking steel ball is arranged between the locking screw and the adjusting screw.

[0021] By adopting the above technical solution, the locking steel ball is arranged between the adjusting screw and the locking screw, which effectively makes the screw threads at both ends of the locking steel ball evenly stressed, thereby ensuring the stability of the adjusting screw and effectively preventing the adjusting screw from loosening after being knocked.

[0022] Preferably, the sliding core structure includes a flat sliding core and a round sliding core which are sequentially slidably arranged in the flat tube, the flat sliding core is connected to the small arm through a connecting rod, and the round sliding core is connected between the spring and the flat sliding core;

[0023] The connecting rod is a cylindrical crank with spherical ends. A spherical pit is provided at the upper part of the forearm near the flat sliding core, and a spherical pit is also provided at the middle part of one end of the flat sliding core near the forearm. The two ends of the connecting rod are respectively slidably arranged in the two spherical pits.

[0024] By adopting the above technical solution, the flat sliding core and the round smooth core are connected between the spring and the forearm, a spherical pit is opened at the connection between the forearm and the flat sliding core, and the connection is made through a cylindrical crank with spherical ends, so that the positioning of the connecting rod in the middle is more stable. At the same time, due to the large contact area between the three, the connection between the three is not easy to wear, which effectively improves the stability and life of the structure.

[0025] Preferably, the end of the flat smooth core close to the round smooth core is a spherical structure, the end of the round smooth core close to the flat smooth core is provided with a spherical pit, and the end of the flat smooth core close to the round smooth core is slidably arranged in the spherical pit of the round smooth core.

[0026] By adopting the above technical solution, a spherical contact method is also adopted between the flat smooth core and the round smooth core, and the contact area between the two is relatively large, which makes the connection less prone to wear and effectively improves the stability and life of the structure.

[0027] Preferably, pulleys are provided on both sides of the flat sliding core close to the inner wall of the flat tube, and the pulleys are in contact with and slidably connected to the inner wall of the flat tube.

[0028] By adopting the above technical solution, a pulley is used as the connection between the inner wall of the flat tube and the small arm, which effectively improves the stability of the small arm during the sliding process on the inner wall of the flat tube, making the axial sliding of the flat sliding core more stable.

[0029] Preferably, grooves are provided on both sides of the upper and lower surfaces of the large arm close to the flat tube, and a centering steel ball is slidably arranged in each of the grooves, and the centering steel ball fits against the inner wall of the flat tube.

[0030] By adopting the above technical solution, the installation of the centering steel ball can effectively ensure that the boom is always within a certain tolerance range during the up and down swing process, improving the stability of this part of the structure. At the same time, the installation of the centering steel ball can also ensure greater flexibility during the left and right swing of the boom and avoid jamming during the swing process.

[0031] In summary, this application includes at least one of the following beneficial technical effects:

[0032] 1. In this invention, the arm is connected to the square tenon through an arc groove and a tightening assembly. The arm has no fulcrum in the torque wrench. During operation, the force point of the square tenon serves as the rotation fulcrum of the arm. The force applied by the operator to the flat tube will not affect the arm, and therefore will not affect the torque output value of the square tenon, thereby improving the torque accuracy of the torque wrench. At the same time, the torque adjustment assembly facilitates the adjustment of the torque of the torque wrench, improving the applicability of the torque wrench.

[0033] 2. The design of the wedge-shaped support teeth and the square tenon allows the teeth of the wedge-shaped support teeth and the square tenon to engage more tightly as force is applied, effectively preventing the square tenon from slipping during force application. At the same time, when the square tenon retracts, the teeth of the square tenon push the wedge-shaped support teeth toward the large end of the wedge, effectively ensuring the ratchet function. At the same time, due to the action of the support spring connected to the support teeth, once the square tenon rotates in the opposite direction, the support spring quickly pushes the wedge-shaped support teeth into the small angle of the wedge, thereby engaging with the teeth of the square tenon, further enhancing the stability of the structure.

[0034] 3. The scale adjustment structure is comprehensively utilized to move inward, driving the spring to compress, thereby driving the sliding core structure to move inward, and driving the small arm to swing through the connecting rod. During the swing of the small arm, the angle between the connecting rod and the wrench axis is adjusted, so that the component of the spring force acting on the connecting rod at right angles to the axis changes, thereby adjusting the torque of the wrench;

[0035] 4. By lengthening or shortening the adjusting screw, the angle between the connecting rod and the wrench axis is adjusted, thereby adjusting the wrench torque and further improving the overall applicability of the device;

[0036] 5. The use of the locking steel ball and the locking screw effectively makes the screw threads at both ends of the locking steel ball evenly stressed, thereby ensuring the stability of the adjusting screw and effectively preventing the adjusting screw from loosening after being struck;

[0037] 6. The cylindrical crank with spherical ends is connected between the flat sliding core and the small arm, making the positioning of the connecting rod in the middle more stable. At the same time, due to the large contact area between the three, the connection between the three is not easy to wear, which effectively improves the stability and life of the structure;

[0038] 7. With the help of the pulley setting, the pulley is used to connect the inner wall of the flat tube and the small arm, which effectively improves the stability of the small arm during the sliding process on the inner wall of the flat tube, making the sliding of the flat sliding core in the axial direction more stable;

[0039] 8. The addition of a centering ball ensures that the boom remains within a certain tolerance range during its up and down swing, improving the stability of this part of the structure. The centering ball also ensures greater flexibility when the boom swings left and right, avoiding jamming during the swing. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a schematic structural diagram of an existing torque wrench;

[0041] FIG2 is a longitudinal cross-sectional view of the overall structure of the torque wrench of Embodiment 1;

[0042] FIG3 is a transverse cross-sectional view of the overall structure of the torque wrench of the first embodiment;

[0043] FIG4 is a schematic diagram showing the force of the torque wrench according to the first embodiment;

[0044] FIG5 is an enlarged schematic diagram of a portion A in FIG3 , mainly showing the structure of the adjusting screw;

[0045] FIG6 is a schematic diagram showing the structure of the flat sliding core and the connecting rod of the first embodiment;

[0046] FIG7 is a schematic structural diagram of the connecting rod according to the first embodiment;

[0047] FIG8 is a schematic diagram of adjustment factors of the torque of the wrench of the first embodiment;

[0048] FIG9 is an axonometric view of the overall structure of the torque wrench of Example 2;

[0049] FIG10 is a partial schematic diagram of the torque wrench of the second embodiment.

[0050] Reference numerals: 1, flat tube; 2, square tenon; 3, upper arm; 31, groove; 32, centering steel ball; 4, arc groove; 5, lower arm; 51, adjustment groove; 52, adjustment screw; 53, locking structure; 531, locking screw; 532, locking steel ball; 6, tightening assembly; 61, mounting groove; 62, wedge-shaped support tooth; 63, support tooth spring; 7, connecting assembly; 71, straight groove; 72, lower arm swing pin; 8, torque adjustment assembly; 81, sliding core structure; 811. Flat sliding core; 812. Round sliding core; 813. Pulley; 82. Scale adjustment structure; 83. Spring; 84. Connecting rod; 9. Retaining ring; 10. Gasket; 11. Bushing; 12. Forearm fixing pin; 13. Arm locating pin; 14. First extension rod; 15. Second extension rod; 16. Fixing screw; 17. Slide groove; 18. Locating hole; 19. Retractable groove; 20. Connecting rod; 21. Docking groove; 22. Docking screw hole; 23. King pin. DETAILED DESCRIPTION

[0051] The present application is further described in detail below with reference to the accompanying drawings.

[0052] In the related art, as shown in FIG1 , torque wrenches currently on the market are usually provided with a main pin 23 on the side close to the square tenon and use the main pin 23 as a fulcrum. During use, this setting method greatly affects the torque by the axial position of the force application point. The closer the force application point is to the head position, the greater the torque; and the farther the force application point is from the head position, the smaller the torque. This will affect the torque accuracy of the torque wrench.

[0053] The embodiment of the present application discloses a novel torque wrench.

[0054] Example 1:

[0055] Referring to Figures 1 and 2, the new torque wrench includes a flat tube 1, with a square tenon 2 provided at one end. An arm 3 and a small arm 5 are rotatably provided on the side of the flat tube 1 near the square tenon 2. The square tenon 2 is connected to the arm 3 and swings along the axis of the square tenon 2. A retaining ring 9, a gasket 10, and a bushing 11 are provided between the square tenon 2 and the arm 3 to improve the connection stability between the square tenon 2 and the arm 3. An arcuate groove 4 is provided on the side of the arm 3 near the square tenon 2. A large arm locating pin 13 that cooperates with the arcuate groove 4 is fixedly provided on the flat tube 1. One end of the large arm locating pin 13 is located in the arcuate groove 4 and slides relatively therein. A tightening assembly 6 is provided between the arm 3 and the square tenon 2 to improve the tightness between the arm 3 and the square tenon 2. A connecting assembly 7 is provided between the arm 3 and the small arm 5 to improve the smoothness of the rotation of the small arm 5. A torque adjustment assembly 8 is provided in the flat tube 1 , and the torque adjustment assembly 8 is used to adjust the torque of the wrench.

[0056] Specifically, an arm locating pin 13 is provided between the arm 3 and the flat tube 1. The arm locating pin 13 is a guide pin fixed on the flat tube 1. An arc groove 4 is provided on the arm 3 to cooperate with the fixing pin of the arm 3. During the swinging of the arm 3, the arm locating pin 13 slides relatively in the arc groove 4, thereby guiding the arm 3, thereby ensuring that the arm 3 swings according to the center of the square tenon 2. At the same time, the design of the structure ensures that no matter how the staff's hand force point moves, it will not affect the torque output value of the square tenon 2, thereby effectively improving the torque accuracy.

[0057] 2 and 3 , in this embodiment, the square tenon 2 is a toothed square tenon 2, and the tightening assembly 6 includes a mounting groove 61 provided at one end of the arc-shaped groove 4 on the upper arm 3, a wedge-shaped support tooth 62 slidably arranged in the mounting groove 61, and a support tooth spring 63 connected between the wedge-shaped support tooth 62 and the inner wall of the mounting groove 61. The wedge-shaped support tooth 62 is meshedly connected to the square tenon 2, and the wedge-shaped support tooth 62 adopts an oblique wedge design.

[0058] Specifically, referring to Figure 3 , when force is applied to the flat tube 1 in direction a, the wedge-shaped support teeth 62 are subjected to counterclockwise torque on the square tenon 2, i.e., direction b (tightening the bolt is generally clockwise, and the reaction force on the square tenon 2 is counterclockwise). However, in this embodiment, a beveled wedge design is employed, resulting in a tighter engagement between the teeth of the wedge-shaped support teeth 62 and the square tenon 2 as force is applied, effectively preventing the square tenon 2 from slipping during force application and driving the upper arm 3 to swing counterclockwise, i.e., direction c. Simultaneously, when the square tenon 2 retracts clockwise, the teeth of the square tenon 2 push the wedge-shaped support teeth 62 toward the large end of the wedge shape, effectively ensuring the ratchet function. Simultaneously, due to the action of the support spring 63 connected to the support teeth, once the square tenon 2 rotates in the opposite direction, the support spring 63 quickly pushes the wedge-shaped support teeth 62 into the small angle of the beveled wedge, thereby engaging with the teeth of the square tenon 2.

[0059] 3 , the connecting assembly 7 includes a straight slot 71 formed at one end of the upper arm 3 near the lower arm 5. An arm swing pin 72 is provided at the end of the lower arm 5 near the upper arm 3. The arm swing pin 72 is slidably disposed in the straight slot 71. During the rotation of the lower arm 5, the arm swing pin 72 slides along the straight slot 71, thereby ensuring that the arm 5 rotates and drives the upper arm 3 to swing more smoothly.

[0060] 2 , 4 and 5 , the torque adjustment assembly 8 includes a sliding core structure 81 and a scale adjustment structure 82 . A spring 83 is provided between the sliding core structure 81 and the scale adjustment structure 82 . A connecting rod 84 is provided between the end of the sliding core structure 81 away from the spring 83 and the small arm 5 . The scale adjustment structure 82 drives the spring 83 and the sliding core structure 81 to rotate the small arm 5 in the flat tube 1 . An adjustment slot 51 is provided on the small arm 5 . An adjusting screw 52 is provided in the adjusting slot 51 . The adjusting screw 52 is used to adjust the angle between the connecting rod 84 and the axis of the flat tube 1 .

[0061] To further illustrate, the inward movement of the scale adjustment structure 82 compresses the spring 83, thereby driving the sliding core structure 81 inward, and through the connecting rod 84, the arm 5 swings. During the swing of the arm 5, the angle between the connecting rod 84 and the wrench axis is adjusted, so that the component of the spring 83 force acting on the connecting rod 84 perpendicular to the axis changes, thereby adjusting the torque of the wrench. At the same time, the angle between the connecting rod 84 and the wrench axis can be adjusted by lengthening or shortening the adjustment screw 52, ​​thereby adjusting the wrench torque, further improving the overall applicability of the device.

[0062] It should be noted that the scale adjustment structure 82 in this embodiment is a conventional scale adjustment structure 82, which is used to adjust the compression amount of the spring 83 and is intuitively displayed through the scale value.

[0063] Specifically, a locking structure 53 is provided within the adjustment slot 51 to prevent the adjustment screw 52 from loosening. The locking structure 53 includes a locking screw 531 disposed within the adjustment slot 51, with a locking steel ball 532 disposed between the locking screw 531 and the adjustment screw 52. The locking steel ball 532, positioned between the adjustment screw 52 and the locking screw 531, effectively evenly applies force to the threads at both ends of the locking steel ball 532, thereby ensuring the stability of the adjustment screw 52 and effectively preventing the adjustment screw 52 from loosening due to impact.

[0064] Referring to Figures 2, 4, 5 and 6, the sliding core structure 81 includes a flat sliding core 811 and a smooth core 812 which are sequentially slidably arranged in the flat tube 1. The flat sliding core 811 is connected to the forearm 5 through a connecting rod 84. The smooth core 812 is connected between the spring 83 and the flat sliding core 811. The connecting rod 84 is a cylindrical crank with spherical ends. A spherical pit is provided at the upper part of the forearm 5 near the flat sliding core 811, and a spherical pit is also provided at the middle part of one end of the flat sliding core 811 near the forearm 5. The two ends of the connecting rod 84 are respectively slidably arranged in the two spherical pits.

[0065] Specifically, the flat sliding core 811 and the round smooth core 812 are connected between the spring 83 and the forearm 5. A spherical pit is provided at the connection between the forearm 5 and the flat sliding core 811, and they are connected by a cylindrical crank with spherical ends, so that the positioning of the connecting rod 84 in the middle is more stable. At the same time, due to the large contact area between the three, the connection between the three is not easy to wear, which effectively improves the stability and life of the structure.

[0066] Referring to Figures 2, 4, and 5, the end of the flat core 811 closest to the round core 812 is spherical, while the end of the round core 812 closest to the flat core 811 is provided with a spherical recess. The end of the flat core 811 closest to the round core 812 slides within the spherical recess of the round core 812. Spherical contact is also employed between the flat core 811 and the round core 812, resulting in a relatively large contact area between the two, making the joint less susceptible to wear and effectively improving the stability and lifespan of the structure.

[0067] Referring to Figure 5, pulleys 813 are installed on both sides of the flat sliding core 811 near the inner wall of the flat tube 1. Pulleys 813 are in contact with and slidably connected to the inner wall of the flat tube 1. The cylindrical crank fulcrum of the flat sliding core 811 is subjected to two force components, Fx and Fy, with Fy balancing the force of spring 83. Two pulleys 813d and e are arranged on either side of the Fx force, simultaneously contacting the side of the flat tube 1, ensuring smoother axial sliding of the flat sliding core 811. The use of pulleys 813 at the connection between the inner wall of the flat tube 1 and the small arm 5 effectively improves the stability of the small arm 5 during its sliding along the inner wall of the flat tube 1, further stabilizing the axial sliding of the flat sliding core 811.

[0068] 4 , 5 and 7 , it can be seen intuitively that the scale adjustment structure 82 moves inward, driving the spring 83 to be compressed, thereby driving the sliding core structure 81 to move inward, and driving the forearm 5 to swing through the connecting rod 84. During the swinging of the forearm 5, the angle α between the connecting rod 84 and the axis of the wrench is adjusted, so that the component of the spring 83 acting on the connecting rod 84 that is perpendicular to the axis changes, thereby adjusting the torque of the wrench.

[0069] At the same time, the angle α between the connecting rod 84 and the wrench axis can be adjusted by adjusting the length and shortening of the adjusting screw 52, ​​thereby adjusting the wrench torque and further improving the overall applicability of the device.

[0070] 1 , it should also be noted that in this embodiment, grooves 31 are provided on both sides of the upper and lower surfaces of the upper arm 3 close to the flat tube 1 , and a centering steel ball 32 is slidably provided in each groove 31 , and the centering steel ball 32 fits against the inner wall of the flat tube 1 .

[0071] The arrangement of the centering balls 32 can effectively ensure that the boom 3 is always within a certain tolerance range during the up and down swinging process, thereby improving the stability of this part of the structure. At the same time, the arrangement of the centering balls 32 can also ensure that the boom 3 is more flexible during the left and right swinging process to avoid jamming during the swinging process.

[0072] The implementation principle of a new torque wrench in the embodiment of the present application is as follows: the upper arm 3 is connected to the square tenon 2, and the upper arm 3 swings along with the center of the square tenon 2. During the swinging process of the upper arm 3, the upper arm positioning pin 13 slides relatively in the arc groove 4, thereby guiding the upper arm 3, thereby ensuring that the upper arm 3 swings along the center of the square tenon 2. At the same time, the design of this structure ensures that no matter how the operator's hand force point moves, it will not affect the torque output value of the square tenon 2, thereby effectively improving the torque accuracy;

[0073] Applying downward force to the flat tube 1, driving it to rotate clockwise, the square tenon 2 is subjected to a counterclockwise reaction force. The design of the bevel wedge makes it so that the more force is applied, the tighter the teeth of the wedge-shaped support teeth 62 and the square tenon 2 bite, thereby effectively preventing the square tenon 2 from slipping during the force application process. At the same time, it can also drive the upper arm 3 to swing counterclockwise. When the square tenon 2 retracts clockwise, the teeth of the square tenon 2 will push the wedge-shaped support teeth 62 to move toward the large end of the wedge, thereby effectively ensuring the function of the ratchet. At the same time, due to the action of the support teeth spring 63 connected to the support teeth, once the square tenon 2 rotates in the opposite direction, the support teeth spring 63 quickly pushes the wedge-shaped support teeth 62 into the small angle of the bevel wedge, thereby engaging with the teeth of the square tenon 2, further improving the stability of the structure.

[0074] The scale adjustment structure 82 moves inward, driving the spring 83 to compress, thereby driving the sliding core structure 81 to move inward, and driving the small arm 5 to swing through the connecting rod 84. During the swinging process of the small arm 5, the angle between the connecting rod 84 and the axis of the wrench is adjusted, so that the component of the spring 83 acting on the connecting rod 84 at right angles to the axis changes, thereby adjusting the torque of the wrench;

[0075] The torque of the wrench can also be adjusted by adjusting the length and shortening of the adjusting screw 52 and thereby adjusting the angle between the connecting rod 84 and the wrench axis.

[0076] Example 2:

[0077] 8 and 9 , the difference between this embodiment and the first embodiment is that a first extension rod 14 is slidably provided on opposite sides of one end of the flat tube 1, one end of the first extension rod 14 is connected to the second extension rod 15, and a slide groove 17 is provided on opposite sides of one end of the flat tube 1, and the other end of the first extension rod 14 is slidably connected to the slide groove 17, and a plurality of positioning holes 18 are sequentially provided inside the slide groove 17, and the other end of the first extension rod 14 is provided with a screw hole identical to the positioning hole 18, and the other end of the first extension rod 14 is provided with a fixing screw 16, and the first extension rod 14 is hinged to the second extension rod 15, and a connecting rod 20 is rotatably provided at one end of one of the second extension rods 15, and a docking groove 21 is provided at one end of the other second extension rod 15, and a docking screw hole 22 is provided at one end of the connecting rod 20 and the side wall of the docking groove 21.

[0078] It should also be noted that one end of the second extension rod 15 can also be provided with a retractable groove 19 for retracting the connecting rod 20, a magnet is provided in the retractable groove 19, and a magnet with opposite magnetic poles is provided on one side of the connecting rod 20.

[0079] The implementation principle of the second embodiment of the present application is as follows: after the fixing screw 16 is rotated and the fixing screw 16 is removed, the first extension rod 14 and the second extension rod 15 can be moved along the slide groove 17. By moving the first extension rod 14 and the second extension rod 15, the overall length of the present invention can be adjusted, which is convenient for lengthening according to on-site conditions. After adjustment, the fixing screw 16 is passed through the first clamping rod and inserted into the docking groove 21 to lock the position of the first clamping rod, which is convenient for subsequent use.

[0080] The hinged second extension rod 15 can be rotated to form an L-shape with the first clamping rod, which is convenient for adjustment when tightening the screw;

[0081] The first extension rod 14 and the second extension rod 15 can be connected by the connecting rod 20. One end of the connecting rod 20 is placed into the docking groove 21, and then the docking screw hole 22 is connected with a screw to achieve the effect of connecting the first extension rod 14 and the second extension rod 15, which is convenient for use.

[0082] The connecting rod 20 can be retracted and released through the provided retractable groove 19 , and the connecting rod 20 can be positioned through the provided magnet.

[0083] 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 new type of torque wrench, characterized by: The invention comprises a flat tube (1), one end of the flat tube (1) is provided with a square tenon (2), a large arm (3) and a small arm (5) are rotatably provided on a side of the flat tube (1) close to the square tenon (2), the large arm (3) is connected to the square tenon (2) and swings along the axis of the square tenon (2), an arc groove (4) is provided on a side of the large arm (3) close to the square tenon (2), a large arm positioning pin (13) matched with the arc groove (4) is fixedly provided on the flat tube (1), one end of the large arm positioning pin (13) is located in the arc groove (4) and slides relatively in the arc groove (4), a tightening assembly (6) is provided between the large arm (3) and the square tenon (2), and the tightening assembly (6) is used to improve the tightness between the large arm (3) and the square tenon (2); A connecting assembly (7) is provided between the upper arm (3) and the lower arm (5), and the connecting assembly (7) is used to improve the smoothness of the rotation of the lower arm (5); A torque adjustment component (8) is provided in the flat tube (1), and the torque adjustment component (8) is used to adjust the torque of the wrench.

2. A new torque wrench according to claim 1, characterized in that: The square tenon (2) is a toothed square tenon (2), and the tightening assembly (6) includes a mounting groove (61) provided at one end of the arc groove (4) on the upper arm (3), a wedge-shaped support tooth (62) slidably arranged in the mounting groove (61), and a support tooth spring (63) connected between the wedge-shaped support tooth (62) and the inner wall of the mounting groove (61), the wedge-shaped support tooth (62) is meshedly connected to the square tenon (2), and the wedge-shaped support tooth (62) adopts an oblique wedge design.

3. A new torque wrench according to claim 1, characterized in that: The connecting assembly (7) comprises a straight slot (71) provided at one end of the upper arm (3) close to the lower arm (5); an arm swing pin (72) is provided at one end of the lower arm (5) close to the upper arm (3); and the arm swing pin (72) is slidably disposed in the straight slot (71).

4. A new torque wrench according to claim 1, characterized in that: The torque adjustment assembly (8) includes a sliding core structure (81) and a scale adjustment structure (82), a spring (83) is provided between the sliding core structure (81) and the scale adjustment structure (82), a connecting rod (84) is provided between an end of the sliding core structure (81) away from the spring (83) and the small arm (5), and the scale adjustment structure (82) drives the spring (83) and the sliding core structure (81) to rotate the small arm (5) in the flat tube (1); An adjustment slot (51) is provided on the small arm (5), and an adjustment screw (52) is provided in the adjustment slot (51). The adjustment screw (52) is used to adjust the angle between the connecting rod (84) and the axis of the flat tube (1).

5. A new torque wrench according to claim 4, characterized in that: A locking structure (53) is provided in the adjustment slot (51), and the locking structure (53) is used to prevent the adjustment screw (52) from loosening.

6. A new torque wrench according to claim 5, characterized in that: The locking structure (53) comprises a locking screw (531) disposed in the adjustment slot (51), and a locking steel ball (532) is disposed between the locking screw (531) and the adjustment screw (52).

7. A new torque wrench according to claim 4, characterized in that: The sliding core structure (81) comprises a flat sliding core (811) and a rounded sliding core (812) which are sequentially slidably arranged in the flat tube (1); the flat sliding core (811) is connected to the small arm (5) via a connecting rod (84); and the rounded sliding core (812) is connected between the spring (83) and the flat sliding core (811); The connecting rod (84) is a cylindrical crank with spherical ends. A spherical pit is provided at the upper portion of the small arm (5) close to the flat sliding core (811). A spherical pit is also provided at the middle portion of one end of the flat sliding core (811) close to the small arm (5). The two ends of the connecting rod (84) are respectively slidably arranged in the two spherical pits.

8. A new torque wrench according to claim 7, characterized in that: One end of the flat sliding core (811) close to the rounded core (812) is a spherical structure, and one end of the rounded core (812) close to the flat sliding core (811) is provided with a spherical pit, and one end of the flat sliding core (811) close to the rounded core (812) is slidably arranged in the spherical pit of the rounded core (812).

9. The novel torque wrench according to claim 7, characterized in that: Pulleys (813) are provided on both sides of the flat sliding core (811) close to the inner wall of the flat tube (1), and the pulleys (813) are in contact with and slidably connected to the inner wall of the flat tube (1).

10. A novel torque wrench according to any one of claims 1 to 9, characterized in that: Grooves (31) are provided on both sides of the upper and lower surfaces of the large arm (3) close to the flat tube (1). A centering steel ball (32) is slidably arranged in each of the grooves (31), and the centering steel ball (32) fits against the inner wall of the flat tube (1).

Images