Torque wrench
The torque wrench incorporates a limiting member and locking mechanism to secure the elastic element, addressing wear and vibration issues, ensuring the wrench's reliability and accuracy.
Patent Information
- Application Number
- TW114135218
- Authority / Receiving Office
- TW · TW
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2025-09-12
- Publication Date
- 2026-07-11
- Estimated Expiration
- 2045-09-11
AI Technical Summary
Conventional torque wrenches experience wear and tear on the outer cover, leading to increased friction and potential failure of the elastic element due to frequent opening and closing, as well as vibration-induced loosening of the elastic element.
A torque wrench design featuring a limiting member that supports and limits the elastic element, preventing it from being pulled out or loosened by the outer cover, and a locking mechanism to resist vibration-induced impact forces, ensuring the elastic element remains secure.
The design effectively prevents the elastic element from becoming loose or failing due to wear and vibration, maintaining the wrench's functionality and setting accuracy.
Smart Images
Figure IMG-2_DRAW_114135218-A0305-14-0001-1 
Figure IMG-2_DRAW_114135218-A0305-14-0002-2 
Figure IMG-2_DRAW_114135218-A0305-14-0003-3
Abstract
Description
Technical Field
[0001] This invention relates to a torque wrench. Prior Technology
[0002] Users often use a torque wrench to tighten fasteners such as bolts and nuts. When the fastener is tightened to a predetermined torque value, the torque wrench will jump out and make a sound to remind the user to stop. This ensures that the fastener is tightened to the appropriate tension, preventing damage due to over-tightening or loosening due to insufficient tension. To allow the user to adjust the predetermined torque value, as shown in Figure 1, the conventional torque wrench has a shaft hole 2 on its circumference, and a rotating shaft 3 passes through the shaft hole 2. One end of the rotating shaft 3 extends out of the bolt hole. A knob 4 is formed outside the shaft hole 2, allowing the user to rotate the shaft 3 via the knob 4, which in turn activates the torque setting mechanism of a conventional torque wrench to adjust the predetermined torque value. In addition, the tube body 1 has a through hole 5 near the shaft hole 2, and an elastic member 6 is provided inside the tube body 1. One end of the elastic member 6 is connected to the shaft 3, and the other end of the elastic member 6 passes through the through hole 5 and is connected to an outer cover 7. The outer cover 7 can be flipped relative to the tube body 1 and can be selectively placed on the outside of the knob 4, thereby preventing the user from accidentally touching the knob 4.
[0003] However, each time the predetermined torque value is adjusted, the user needs to first flip open the outer cover 7 to expose the knob 4, and then flip open the outer cover 7 again to cover the knob 4 after adjustment. Therefore, after long-term use, as shown in Figure 2, the end 8 of the outer cover 7 will rub against the surface of the tube 1 for a long time, causing the surface of the tube 1 to wear and produce a rough surface 9. As a result, when the user flips open the outer cover 7 later, the friction between the end 8 and the rough surface 9 will increase, hindering the sliding of the end 8. Consequently, the outer cover 7 will forcefully pull the elastic element 6, causing the elastic element 6 to be easily pulled out of the perforation 5 and become loose and fail. On the other hand, when the conventional torque wrench jumps out, it will generate vibration. The impact force caused by the vibration will be transmitted to the elastic element 6 along the axial direction of the tube 1, which will also easily cause the elastic element 6 to be impacted and pass through the perforation 5, becoming loose and fail. Summary of the Invention
[0004] The purpose of this invention is to provide a torque wrench that can effectively support and limit the elastic element to ensure that the elastic element does not loosen or fail.
[0005] To achieve the above objectives, the torque wrench provided by the present invention comprises a tube body, one end of which is provided with a working head. The working head is connected to a release unit, which can release when the force reaches a set value. The tube body also has a shaft hole and a through hole adjacent to the shaft hole, and an adjusting member is provided corresponding to the shaft hole. The adjusting member has a rotating shaft passing through the shaft hole and connected to the release unit. One end of the rotating shaft extends out of the shaft hole and forms a knob. Furthermore, it includes an outer cover disposed outside the tube body, which can be selectively applied to the outside of the knob, and further includes... An elastic element is disposed within the tube body. One end of the elastic element is connected to the rotating shaft, and the other end of the elastic element extends through the through hole and is connected to the outer cover. One end of the elastic element is provided with a top abutting point that abuts against the rotating shaft, while the other end of the elastic element is laterally bent and extends to a connecting portion that extends through the through hole and is connected to the outer cover. The connecting portion has a receiving surface on the side opposite to the top abutting point. Furthermore, a limiting element is included. The limiting element is disposed near the connecting portion and has a top abutting surface opposite to the receiving surface, which abuts against the receiving surface.
[0006] The torque wrench provided by this invention, when the user flips open the outer cover, at this time the abutting surface is in contact with the abutting surface, so the limiting member can effectively support and limit the elastic element, preventing the elastic element from being pulled out of the hole by the outer cover and becoming loose and failing. On the other hand, when the release unit releases and generates vibration, the limiting member can also effectively resist the impact force, ensuring that the elastic element is not loosened and fails due to the impact force. Simple Explanation of the Diagram
[0007] Figure 1 is a cross-sectional view of a conventional torque wrench before it wears out. Figure 2 is a cross-sectional view of a conventional torque wrench after it has become worn. Figure 3 is a perspective view of the first preferred embodiment of the present invention. Figure 4 is a cross-sectional view of the first preferred embodiment of the present invention. Figure 5 is a partial exploded view of the first preferred embodiment of the present invention. Figure 6 is a partial cross-sectional view of the first preferred embodiment of the present invention. Figure 7 is a schematic diagram of the use of the first preferred embodiment of the present invention when opening the outer cover. Figure 8 is a schematic diagram of the use of the first preferred embodiment of the present invention when the outer cover is closed. Figure 9 is a partial exploded view of the second preferred embodiment of the present invention. Figure 10 is a partial cross-sectional view of the second preferred embodiment of the present invention. Figure 11 is a partial exploded view of the third preferred embodiment of the present invention. Figure 12 is a partial cross-sectional view of the third preferred embodiment of the present invention. Figure 13 is a partial cross-sectional view of the fourth preferred embodiment of the present invention. Figure 14 is a cross-sectional view at section line 14-14 in Figure 13 of the fourth preferred embodiment of the present invention. Implementation
[0008] Please refer to Figures 3 and 4, which are perspective and sectional views of the first preferred embodiment of the present invention, respectively. These figures reveal a torque wrench 100, which has a tube body 10. One end of the tube body 10 has a working head 20, and the other end has a handle 30. A release unit 40 is provided inside the tube body 10 and is connected to the working head 20, allowing it to release when the force reaches a set value. The set value can be adjusted by connecting the release unit 40 to an adjustment member 50. The adjustment member 50 is connected to an outer cover 70 through an elastic member 60. The outer cover 70 can rotate relative to the tube body 10 and can be selectively placed on the outside of the adjustment member 50 to prevent the user from accidentally touching the adjustment member 50. At the same time, a limiting member 80 is provided inside the tube body 10 near the elastic member 60 to prevent the elastic member 60 from loosening. Details will be described later.
[0009] Please refer to Figure 4. The release unit 40 has a long rod 41 and a short rod 42 arranged adjacent to each other. One end of the long rod 41 is connected to the working head 20, and the other end extends along the axial direction of the tube 10 and is connected to the adjusting member 50. One end of the short rod 42 is connected to the working head 20, and the other end extends along the axial direction of the tube 10 to a position near the middle of the long rod 41, where a pressure-bearing part 421 is provided. At the same time, a release member 43 is pivotally mounted on the long rod 41. One end of the release member 43 presses against the pressure-bearing part 421, and a spring 44 is connected between the other end and the long rod 41. In addition, a stop member 45 is provided on the inner wall of the tube 10 corresponding to the release member 43. Therefore, when using the torque wrench 100, the long rod 41 and the short rod 42 will bend due to torque, and as the applied force increases, the release member 43 gradually... As the torque approaches the abutment 45 and reaches the set value, the release member 43 rotates clockwise due to the blockage of the abutment 45, causing the pressure-bearing part 421 to jump off the release member 43, producing a sound and vibration to alert the user to stop operation. On the other hand, the circumference of the tube body 10 is provided with a shaft hole 11, and the adjusting member 50 has a rotating part that passes through the shaft hole 11 and connects to the release unit 40. Shaft 51, one end of which extends out of shaft hole 11 and forms a knob 52. In this embodiment, long rod 41 is provided with a screw hole 411, and shaft 51 is provided with a threaded part 511. The threaded part 511 is screwed into the screw hole 411. Thus, when the user rotates the knob 52, the long rod 41 will be displaced by the screwing of the threaded part 511, thereby adjusting the setting value of the jump unit 40.
[0010] Please refer to Figures 5 and 6. The tube body 10 has a through hole 12 near the shaft hole 11. The elastic member 60 is disposed inside the tube body 10. One end of the elastic member 60 has a top abutment 61, which abuts against the rotating shaft 51. The other end of the elastic member 60 is laterally bent and extends to a connecting part 62. The connecting part 62 passes through the through hole 12 and is connected to the outer cover 70, which can fix the outer cover 70 to the outside of the tube body 10. In this embodiment, a protruding ring 512 is provided on the periphery of the rotating shaft 51. The protruding ring 512 and the knob 52 form an annular groove 513. The top abutment 61 has a pair of extension arms 611. The extension arms 611 form a notch 612, so that the extension arms 611 can be clamped in the annular groove 513 of the rotating shaft 51. On the other hand, one end of the outer cover 70 is provided with a pivot portion 71, and the connecting portion 62 has an extension section 621 and a barbed section 622 that extends in the opposite direction from the extension section 621. The barbed section 622 is hooked onto the pivot portion 71, so that the outer cover 70 is fixed to the outside of the tube body 10 and can rotate relative to the tube body 10 with the pivot portion 71 as the axis.
[0011] Please refer to Figures 5 and 6. The connecting part 62 has a receiving surface 63 on the side opposite to the abutment top 61, and the limiting member 80 has a top surface 81 corresponding to the receiving surface 63. The top surface 81 abuts against the receiving surface 63. In this embodiment, the receiving surface 63 is located on the side of the extension section 621 opposite to the abutment top 61, and the limiting member 80 is a fixing block 80A. The fixing block 80A has the top surface 81 on the side facing the receiving surface 63. The tube body 10 has a plurality of first fixing holes 13, and the fixing block 80A has a plurality of second fixing holes 82 corresponding to the first fixing holes 13. It also includes a plurality of fixing pins 83. The fixing pins 83 are respectively inserted into each set of corresponding first fixing holes 13 and second fixing holes 82, thereby fixing the fixing block 80A to the tube body 10.
[0012] Please refer to Figures 7 and 8. When a user wants to adjust the setting of the jump unit 40, first, as shown in Figure 7, flip open the outer cover 70 to expose the knob 52. The user can then rotate the knob 52 to drive the rotating shaft 51, causing the rotating shaft 51 to move the long rod 41, thus adjusting the setting. After adjustment, as shown in Figure 8, the user simply flips the outer cover 70 back to cover the knob 52, preventing accidental activation. During the process of the user flipping open the outer cover 70, the abutting surface 81 is pressed against the resisting surface 63, so the limiting member 80 effectively supports and limits the elastic member 60. Even if the surface of the tube 10 is worn, increasing friction, the elastic member 60 will not be pulled out of the perforation 12 by the outer cover 70 and become loose. On the other hand, when the release unit 40 releases and vibrates, the impact force F caused by the vibration is transmitted along the axial direction X of the tube 10 to the elastic member 60. At this time, because the abutting surface 81 is abutting the receiving surface 63, the elastic member 60 can be effectively supported by the limiting member 80 to resist the impact force F, ensuring that the elastic member 60 is not loosened or failed by the impact force F. It is worth mentioning that the extension section 621 can be extended along an imaginary axis A, and the imaginary axis A is perpendicular to the axial direction X of the tube 10. In this way, the receiving surface 63 and the abutting surface 81 are arranged perpendicular to the impact direction of the impact force F, which can more effectively resist the impact force F.
[0013] Furthermore, the vibration generated when the release unit 40 releases can easily cause the adjustment member 50 to rotate unexpectedly, thus changing the setting value of the release unit 40. Therefore, as shown in Figure 5, the knob 52 of the adjustment member 50 may be provided with a first locking part 521, and the outer cover 70 is provided with a covering part 72 corresponding to the knob 52. Inside the covering part 72, corresponding to the first locking part 521, a second locking part 721 is provided. The second locking part 721 can lock onto the first locking part 521. In this embodiment, the first locking part 521 is a ring toothed groove 521A surrounding the knob 52, and the second locking part 721 is a toothed row 721A disposed inside the cover part 72. Preferably, the outer cover 70 may extend from the pivot part 71 to have a top end 711, and the periphery of the tube body 10 is provided with a stop part 121 corresponding to the top end 711. The top end 711 abuts against the stop part 121. The stop part 121 may have multiple... Different forms are possible. For example, in this embodiment, the blocking part 121 is a recessed part 121A, and the through hole 12 is provided on the bottom surface of the recessed part 121A. Thus, as shown in Figure 7, when the user wants to adjust the setting value, he only needs to open the outer cover 70 first, so that the second latching part 721 disengages from the first latching part 521. Then, he can further adjust the setting value by rotating the knob 52, which drives the rotating shaft 51 to rotate. After the adjustment is completed, as shown in Figure 8, as long as... Then, flip the outer cover 70 to lock the second latching part 721 into the first latching part 521. When the release unit 40 releases and vibrates, the outer cover 70 is stopped by the blocking part 121 and can resist the impact of the vibration without sliding. This ensures that the second latching part 721 is tightly locked into the first latching part 521, so that the knob 52 has no freedom of rotation. In this way, the position of the knob 52 can be locked to ensure that the setting value will not change.
[0014] Please refer to Figures 9 and 10, which are exploded and sectional views of the second preferred embodiment of the present invention. The torque wrench 100 differs from the first preferred embodiment in that the limiting member 80 can have various forms. In this second embodiment, the tube 10 has a positioning hole 14, and the limiting member 80 is a positioning pin 80B. The positioning pin 80B is fixed to the positioning hole 14, and the side of the positioning pin 80B facing the abutting surface 63 has an abutting surface 81 that abuts against the abutting surface 63. Therefore, the limiting member 80 can effectively support the elastic member 60, ensuring that the elastic member 60 is not affected by the vibration caused by the release unit 40 jumping out. The first locking part 521 and the second locking part 721 can also have various different forms. For example, in this second embodiment, the first locking part 521 is a plurality of grooves 521B spaced around the knob 52, and the second locking part 721 is a protrusion 721B. In addition, the abutment part 121 in this embodiment is a protrusion 121B provided on the periphery of the tube body 10 and near the barbed section 622. In this way, the abutment tip 711 can abut against the protrusion 121B. When the jumping unit 40 jumps out and generates vibration, the outer cover 70 is blocked by the protrusion 121B and can resist the impact generated by the vibration and will not slide.
[0015] Please refer to Figures 11 and 12, which are exploded and sectional views of the third preferred embodiment of the present invention. The torque wrench 100 differs from the aforementioned first preferred embodiment in that the abutting surface 63 is located on the side of the barb section 622 opposite to the extension section 621, and the tube body 10 has a limiting hole 15 near the through hole 12. The limiting member 80 is a limiting pin 80C, which has a pin body portion. 84. The pin body 84 passes through the limiting hole 15, and one end of the pin body 84 extends out of the limiting hole 15 and expands outward to form a head 85. The head 85 has a supporting surface 81 on the side facing the abutting surface 63. In this way, the limiting member 80 can effectively support the elastic member 60, ensuring that the elastic member 60 is not pulled out of the hole by the outer cover 70 or is not loosened or failed due to the vibration and impact generated by the release unit 40. In addition, in this third embodiment, the outer cover 70 has a stop 722 on the inner side of the cover portion 72. When the outer cover 70 is closed on the outside of the knob 52, the stop 722 abuts against the side of the knob 52 opposite to the connecting portion 62, so that the outer cover 70 can resist the impact generated by vibration and will not slide.
[0016] Please refer to Figures 13 and 14, which are cross-sectional views of the fourth preferred embodiment of the present invention and the cross-sectional view at section line 14-14 in Figure 13. Unlike the previous embodiments, which used a blocking method to support the elastic member 60, in this fourth preferred embodiment, the limiting member 80 is a limiting ring 80D. The limiting ring 80D is sleeved on the periphery of the rotating shaft 51 and the extension section 621, and the inner ring side of the limiting ring 80D has a supporting surface 81 corresponding to the abutting surface 63. In this way, when the jumping unit 40 jumps out and generates vibration, the limiting member 80 can effectively hold the elastic member 60 to ensure that the elastic member 60 does not loosen or fail.
[0017] In summary, this invention has excellent progressiveness and practicality compared to similar products. Furthermore, a thorough review of domestic and international technical data on this type of structure has revealed no prior examples of the same construction. Therefore, this invention meets the requirements for a patent and is hereby applied for.
[0018] However, the above descriptions are merely a few preferred embodiments of the present invention. Therefore, any equivalent structural changes made in accordance with the present invention specification and the claims should be included within the scope of the present invention.
[0019] 100: Torque Wrench 10: Pipe body 11: Shaft Hole 12: Perforation 121: Resistance Section 121A: Recessed portion 121B: Protrusion 13: First fixing hole 14: Positioning hole 15: Limiting hole 20: Working head 30: Grip 40: Breakout Unit 41: Long pole 411: Screw hole 42: Short Shot 421: Pressure-bearing section 43: detachment component 44: Spring 45: Top-down component 50: Adjustment parts 51: Shaft 511: Threaded section 512:Protruding ring 513: Annular groove 52: Knob 521: First Card Control Section 521A: Ring Gear Groove 521B: Groove 60: Elastic element 61: Reach the top 611: Extension Arm 612: Gap 62: Connecting part 621: Extension 622: Backhand Segment 63: The side receiving the offer 70: Outer cover 71: Pivot section 711: Reach the top 72: Covering and closing parts 721: Second Card Section 721A: Gear rack 721B: Bump 722: Stop 80: Limiting component 80A: Fixing block 81: Top surface 82: Second fixing hole 83: Fixed pin 80B: Positioning pin 80C: Limit pin 84: Body Selling Department 85: Head 80D: Limiting Ring F: Impact force A: Imaginary axis X: Axial axis
Claims
1. A torque wrench comprising a tube body, one end of which is provided with a working head connected to a release unit for release when a set force is applied; a shaft hole and a through hole adjacent to the shaft hole are provided on the periphery of the tube body; an adjusting member is provided corresponding to the shaft hole, the adjusting member having a rotating shaft passing through the shaft hole and connected to the release unit; one end of the rotating shaft extending out of the shaft hole and forming a knob; further comprising an outer cover disposed outside the tube body, the outer cover being selectively disposed outside the knob; and further comprising an elastic member disposed inside the tube body, one end of the elastic member being connected to the rotating shaft, and the other end of the elastic member extending out of the through hole and connected to the outer cover; the main feature being: One end of the elastic element has a top abutting point that abuts against the rotating shaft, while the other end of the elastic element extends laterally with a connecting portion that passes through the through hole and connects to the outer cover. The connecting part has a receiving surface on one side opposite to the top; a limiting member is provided at a position adjacent to the connecting part, and the limiting member has a top surface opposite to the receiving surface, the top surface abutting against the receiving surface.
2. The torque wrench as described in claim 1, wherein, The connecting part has an extension section and a barbed section that extends in the opposite direction from the extension section, and the abutting surface is provided on the side of the extension section opposite to the abutting top.
3. The torque wrench as described in claim 1, wherein, The connecting part has an extension section and a barbed section that extends in the opposite direction from the extension section, and the abutting surface is provided on the side of the barbed section opposite to the extension section.
4. A torque wrench as described in claim 2 or 3, wherein, The extension section extends along an imaginary axis, which is perpendicular to the axial direction of the tube body.
5. The torque wrench as described in claim 2, wherein, The pipe system is provided with a plurality of first fixing holes, and the limiting member is a fixing block. The fixing block is provided with a plurality of second fixing holes corresponding to the first fixing holes, and also includes a plurality of fixing pins. The fixing pins are respectively provided in each pair of first fixing holes and second fixing holes to fix the fixing block to the pipe body. In addition, the side of the fixing block facing the abutting surface is provided with the abutting surface.
6. The torque wrench as described in claim 2, wherein, The pipe system has a positioning hole, and the limiting member is a positioning pin. The positioning pin is fixed in the positioning hole, and the side of the positioning pin facing the abutting surface has a resisting surface.
7. The torque wrench as described in claim 2, wherein, The limiting component is a limiting ring, which is sleeved on the outer periphery of the rotating shaft and the extension section, and the inner ring side of the limiting ring is provided with a top surface corresponding to the abutting surface.
8. The torque wrench as described in claim 3, wherein, The tube body is provided with a limiting hole near the perforation, and the limiting member is a limiting pin. The limiting pin is provided with a pin body, which passes through the limiting hole. At the same time, one end of the pin body extends out of the limiting hole and expands outward to form a head. The side of the head facing the abutting surface is provided with the abutting surface.
9. The torque wrench as described in claim 1, wherein, The knob of the adjustment component is provided with a first locking part, and the outer cover is provided with a second locking part corresponding to the first locking part. When the outer cover is selectively placed on the outside of the knob, the second locking part is locked and fixed to the first locking part, so that the knob cannot be rotated. At the same time, the outer cover extends to a top end, and the periphery of the tube body is provided with a stop part corresponding to the top end, and the top end abuts against the stop part.
10. The torque wrench as described in claim 1, wherein, The knob of the adjustment component is provided with a first locking part, and the outer cover is provided with a second locking part corresponding to the first locking part. The outer cover is also provided with a stop. When the outer cover is selectively placed on the outside of the knob, the second locking part is locked and fixed to the first locking part, and the stop is abutted against the side of the knob opposite the connecting part.