Mechanical torque wrench

Abstract

The present application provides a mechanical torque wrench, which comprises a body, a wrenching device, a torque disconnecting device and a torque adjusting device. The wrenching device has a long lever and a short lever extending into the body, and the long lever defines a virtual horizontal axis. The torque disconnecting device is arranged between the long lever and the short lever, and has a disconnecting member arranged on the long lever. The disconnecting member extends towards the short lever and approaches the virtual horizontal axis, so as to selectively abut against the short lever. When the mechanical torque wrench reaches a preset torque value, the disconnecting member and the short lever are in a disconnected state. The torque adjusting device is assembled on the body, and has a moving seat and an adjusting member. The moving seat supports one end of the disconnecting member away from the short lever. The adjusting member can be rotated to drive the moving seat to linearly displace, and change the force of the disconnecting member abutting against the short lever.

Description

Technical Field

[0001] This invention relates to a torque wrench, and more particularly to a mechanical torque wrench. Background Technology

[0002] For example, the torque wrench described in U.S. Patent Publication No. 10,618,150B2, entitled "Torque wrench," includes a head, a torque adjustment assembly, and a main beam and a secondary beam housed within the handle. The main beam is longer than the secondary beam, and both beams are fixed to the head and rotate with it. The main beam and secondary beam are releasably connected via a spring-biased trigger, and a trigger actuator is coupled to the handle and adjacent to the trigger. When the applied force reaches a preset torque value, the torque wrench releases due to the trigger on the main beam being abutted by the trigger actuator, making the trigger actuator an indispensable component of the torque wrench. Furthermore, the torque adjustment assembly of the torque wrench uses the meshing of multiple gears and racks to offset the main beam, moving it away from the trigger actuator for torque setting. However, this torque adjustment assembly has many parts, causing manufacturing and assembly difficulties.

[0003] Furthermore, the "Torque wrench" in U.S. Patent Publication No. 11,534,898B2 employs a different adjustment method. The torque adjustment screw on this wrench is located on the side of the handle, making adjustment inconvenient. Moreover, this torque wrench also requires a trigger mechanism similar to a screw to achieve torque release.

[0004] The torque structure disclosed in Taiwan Invention Patent No. I715518B is also a torque wrench with the torque adjustment group set on the side of the first body. Similar to the aforementioned torque wrench, it is less convenient to use. In addition, the torque structure also requires the use of a screw-like release part to achieve the torque release function. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a mechanical torque wrench in which a disconnecting element selectively abuts against a short rod. When the applied force reaches a preset torque value, the disconnecting element can disconnect from the short rod, allowing the disconnecting element to swing from the abutting position to the disconnected position without the aid of other components, thereby interrupting the torque.

[0006] To achieve the above objectives, the present invention provides a mechanical torque wrench in one embodiment, comprising a body, an actuating device, a force-disconnecting device, and a torque adjusting device. The body has a first end and a second end away from the first end along a first axis, with a receiving space between the first and second ends. The actuating device has a driving part and a long rod and a short rod opposite to the driving part. The driving part is rotatable along a second axis perpendicular to the first axis to drive a fastener. The long rod and the short rod extend into the receiving space from the first end. The long rod defines a virtual horizontal axis, and the side of the short rod away from the driving part has a first abutting end. The torque-disconnecting device is disposed between the long rod and the short rod, and has a disconnecting member. The disconnecting member is oscillating along a third axis parallel to the second axis on the long rod, and is oscillating between an abutting position and a disconnecting position. The third axis is perpendicular to the virtual horizontal axis, and the disconnecting member has a second abutting end. The second abutment extends towards the short rod and approaches the virtual horizontal axis to selectively abut against the first abutment. When the force applied by the mechanical torque wrench reaches the preset torque value, the second abutment of the disconnector can disconnect from the first abutment of the short rod, causing the disconnector to swing from the abutment position to the disconnection position. The torque adjustment device is assembled with the main body. The adjustment device has a movable seat and an adjustment member. The movable seat is slidably disposed in the accommodating space to support the end of the disconnector away from the second abutment. The adjustment member is rotatably disposed between the movable seat and the main body along a fourth axis parallel to the third axis. The adjustment member is exposed on one side of the main body and can be rotated to drive the movable seat to move along a direction parallel to the first axis and change the force of the second abutment against the first abutment.

[0007] In another embodiment of the invention, the first abutting end extends beyond the virtual horizontal axis, the second abutting end extends to the virtual horizontal axis without crossing it, and when the disconnecting member and the short rod are in the abutting position, the vertical distance from the third axis to the second axis is less than the vertical distance from the first abutting end to the second axis.

[0008] In another embodiment of the invention, the movable seat is provided with an inclined groove and a first tooth portion away from the inclined groove, the disconnecting member has a bearing portion away from the second abutting end, the bearing portion extends into the movable seat and abuts against the inclined groove; the torque adjusting device has a rotating member connected to the adjusting member along a fourth axis, the rotating member having a second tooth portion that engages with the first tooth portion.

[0009] In another embodiment of the present invention, the torque disconnection device includes an elastic element disposed between the long rod and the disconnection element, for keeping the bearing portion abutting against an inner wall of the inclined groove and maintaining the disconnection element in the abutting position; the bearing portion has an arc-shaped cross-section.

[0010] In another embodiment of the invention, the disconnecting member has a long plate-shaped body, a second abutting end is provided at one end of the body, a supporting part is provided at the other end of the body and extends laterally, and the elastic member abuts the body at a position between the second abutting end and the supporting part.

[0011] In another embodiment of the present invention, the main body is provided with a top surface and a bottom surface arranged oppositely along the fourth axis direction, the inclined groove faces the top surface, the adjusting member faces the bottom surface, the top surface is provided with a scale hole arranged along the direction parallel to the first axis direction, the scale hole is connected to the accommodating space, and a mounting hole facing the scale hole is provided between the first tooth and the inclined groove, the mounting hole is equipped with a torque indicator, and the torque indicator is exposed outside the scale hole.

[0012] In another embodiment of the present invention, the movable seat is rectangular and has a movable groove arranged along a direction parallel to the first axis. A first tooth is provided on one side of the inner edge of the movable groove. The movable seat has an elongated groove arranged along a direction parallel to the first axis on one side of the movable groove. The lever device has a lever member, a drive unit is detachably provided at one end of the lever member, a long rod and a short rod are fixed at one end of the lever member, and a distal end of the long rod extending into the movable seat is provided on the side away from the lever member. A torque fine-tuning device is provided between the body and the long rod.

[0013] In another embodiment of the present invention, the long rod has a first fixed end away from the distal end, the short rod has a second fixed end away from the first abutting end, and the lever has a first fixed hole and a second fixed hole arranged in parallel and not communicating with each other. The first fixed end extends into the first fixed hole for positioning, and the second fixed end extends into the second fixed hole for positioning. The cross-sections of the first fixed hole, the second fixed hole, the first fixed end, and the second fixed end are all square.

[0014] In another embodiment of the present invention, the first fixing hole has four first abutting surfaces, which are connected by a first arcuate groove, and the first abutting surfaces abut against the four peripheral sides of the first fixing end; the second fixing hole has four second abutting surfaces, which are connected by a second arcuate groove, and the second abutting surfaces abut against the four peripheral sides of the second fixing end.

[0015] In another embodiment of the invention, a braking device is further provided between the movable seat and the body. The braking device is operable between a release position and a braking position. In the release position, the movable seat is displaced and the inclined groove slides relative to the bearing portion. In the braking position, the braking device clamps the movable seat and the body, preventing the movable seat from moving relative to the body.

[0016] In another embodiment of the invention, the body has a top surface and a bottom surface arranged oppositely along the fourth axis. The braking device further includes a shaft, an operating member, and a pressing member. The shaft extends through the body and the movable seat along the fourth axis and protrudes from the bottom surface of the body for the operating member to be pivotally mounted. The operating member has an eccentric cam pivotally mounted on the shaft, allowing the user to selectively pivot the operating member relative to the shaft, causing the operating member to drive the shaft to move along the fourth axis. The pressing member is located at the end of the shaft away from the operating member and is slidably connected to the adjusting member. In the braking position, the operating member pulls the shaft along the fourth axis, causing the adjusting member and the pressing member to press against each other, with the adjusting member pressing against the body and the pressing member pressing against the movable seat under the force of the eccentric cam, thereby clamping the body and the movable seat. In the release position, the operating member is relaxed relative to the shaft, allowing the user to rotate the adjusting member and thus drive the movable seat to slide relative to the body along a direction parallel to the first axis.

[0017] The beneficial effects of the present invention are: the present invention does not require additional components, so that when the force applied by the mechanical torque wrench reaches the preset torque value, the disconnecting part and the short rod can be disconnected. This eliminates the configuration and assembly steps of additional components, simplifies the structure, and also helps the mechanical torque wrench to bring better precision performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance of an embodiment of the mechanical torque wrench of the present invention.

[0019] Figure 2 This is an exploded view of an embodiment of the mechanical torque wrench of the present invention.

[0020] Figure 3 along Figure 1 The schematic diagram of the cross section taken along the AA section line shows the long rod and the short rod installed in the first fixing hole and the second fixing hole.

[0021] Figure 4 along Figure 1 A partial cross-sectional schematic diagram taken along the BB section line shows the braking device in the braking position.

[0022] Figure 5 along Figure 1 A partial cross-sectional schematic diagram taken along the CC section line shows that the supporting part of the disconnected part abuts against the end of the inclined groove away from the torque indicator, and the torque setting value is set to the maximum.

[0023] Figure 6 for Figure 5 A magnified view of a portion of the image.

[0024] Figure 7 To continue Figure 5This is a schematic diagram of the turning action of a mechanical torque wrench according to an embodiment of the present invention, showing that the disconnecting element and the short rod are disconnected.

[0025] Figure 8 This is a partial longitudinal sectional view of the mechanical torque wrench of the present invention, showing the braking device in the released position.

[0026] Figure 9 This is a partial cross-sectional schematic diagram of the mechanical torque wrench of the present invention, showing that the bearing part of the disconnecting member abuts against one end of the inclined groove near the torque indicator, and the torque setting value is set small.

[0027] Figure 10 This is a graph showing the ratio of the torque setting value to the actual torque value of this invention.

[0028] Explanation of reference numerals in the attached figures: 100: Mechanical torque wrench.

[0029] 10: Ontology.

[0030] 11: First end.

[0031] 111: Locate the convex part.

[0032] 12: Second end.

[0033] 13: Storage space.

[0034] 14: Top surface.

[0035] 141: Scale hole.

[0036] 15: Bottom surface.

[0037] 16: Perforation.

[0038] 20: Trigger mechanism.

[0039] 201: Locking slot.

[0040] 202: First fixing hole.

[0041] 202a: First contact surface.

[0042] 202b: First arc-shaped groove.

[0043] 203: Second fixing hole.

[0044] 203a: Second abutment surface.

[0045] 203b: Second arc-shaped groove.

[0046] 21: Actuator.

[0047] 22: Drive unit.

[0048] 221: Card combination block.

[0049] 23: Long pole.

[0050] 230: Surrounding side.

[0051] 231: First fixed end.

[0052] 232: Remote.

[0053] 233: Pivot hole.

[0054] 234: Groove.

[0055] 235: Through hole.

[0056] 24: Short shot.

[0057] 240: Surrounding side.

[0058] 241: Second fixed end.

[0059] 242: First contact end.

[0060] 30: Torque disconnect device.

[0061] 31: Disconnected component.

[0062] 311: Body.

[0063] 312: Second contact end.

[0064] 313: Supporting part.

[0065] 314: Pivot ear.

[0066] 315: Sold parts.

[0067] 32: Elastic component.

[0068] 40: Torque adjustment device.

[0069] 41: Portable seat.

[0070] 411: Inclined groove.

[0071] 4111: Inner wall.

[0072] 412: First tooth.

[0073] 413: Moving slot.

[0074] 414: Long groove.

[0075] 415: Mounting hole.

[0076] 42: Adjustment parts.

[0077] 421: Rod section.

[0078] 43: Rotating component.

[0079] 431: Second tooth.

[0080] 44: Torque indicator.

[0081] 50: Braking device.

[0082] 51: Shaft.

[0083] 511: Screw fasteners.

[0084] 52: Operating components.

[0085] 521: Eccentric cam.

[0086] 53: Pressing component.

[0087] 60: Torque fine-tuning device.

[0088] 61: Adjusting screw.

[0089] 62: Limit screw.

[0090] L1: First axis.

[0091] L2: Second axis.

[0092] L3: Third axis.

[0093] L4: Fourth axis.

[0094] Y: Virtual horizontal axis. Detailed Implementation

[0095] Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is not intended to limit the technical principles of the present invention to the specific disclosed embodiments, but the scope of the present invention is limited only by the scope of the claims, covering alternatives, modifications and equivalents.

[0096] Please see Figures 1 to 9 As shown, in one embodiment of the present invention, a mechanical torque wrench 100 is provided, which includes a body 10, a levering device 20, a torque disconnecting device 30, and a torque adjusting device 40.

[0097] The body 10 is a hollow, elongated rectangle. Along a first axis L1, the body 10 has a first end 11 and a second end 12 away from the first end 11. The second end 12 is for gripping and applying force. A receiving space 13 exists between the first end 11 and the second end 12. The body 10 has a top surface 14 and a bottom surface 15 opposite to the first end 11 and the second end 12. A through hole 16 is provided between the first end 11 and the second end 12, opening onto the bottom surface 15 and the top surface 14 of the body 10 along a direction perpendicular to the first axis L1 (i.e., a fourth axis L4). Furthermore, the top surface 14 of the body 10 has a graduated hole 141 arranged parallel to the first axis L1, which communicates with the receiving space 13.

[0098] The lever device 20 includes a lever 21, a drive unit 22, a long rod 23, and a short rod 24. The lever 21 has a locking groove 201, and the drive unit 22 has a locking block 221 that is detachably engaged with the locking groove 201. The long rod 23 and the short rod 24 are fixed to one end of the lever 21 and opposite to the drive unit 22, and the free ends of the long rod 23 and the short rod 24 extend into the receiving space 13 from the direction of the first end 11. In use, the drive unit 22 can rotate along a second axis L2 perpendicular to the first axis L1 to drive the fastener.

[0099] In this embodiment of the invention, the lever 21 has a first fixing hole 202 and a second fixing hole 203 arranged in parallel and not connected on the side away from the engaging groove 201. The cross-sections of the first fixing hole 202 and the second fixing hole 203 are both square.

[0100] The long rod 23 has a first fixed end 231 and a distal end 232 away from the first fixed end 231 and the lever 21. The first fixed end 231 of the long rod 23 extends into the first fixing hole 202 for positioning. The long rod 23 further defines a virtual horizontal axis Y. The short rod 24 has a second fixed end 241 and a first abutting end 242 away from the second fixed end 241. The second fixed end 241 extends into the second fixing hole 203 for positioning, and the cross-sections of both the first fixed end 231 and the second fixed end 241 are square. Furthermore, as... Figure 3As shown, the first fixing hole 202 has four first abutment surfaces 202a, which are connected by a first arc-shaped groove 202b. The first abutment surfaces 202a abut against the four peripheral sides 230 of the first fixing end 231 of the long rod 23. The second fixing hole 203 has four second abutment surfaces 203a, which are connected by a second arc-shaped groove 203b. The second abutment surfaces 203a abut against the four peripheral sides 240 of the second fixing end 241 of the short rod 24. In this way, the long rod 23 and the short rod 24 can be supported and fixed by the first fixing hole 202 and the second fixing hole 203 to maintain a tight fit, and to control the precise position of the long rod 23 and the short rod 24 on the lever 21.

[0101] In another embodiment of the present invention, the first end 11 of the body 10 is provided with a plurality of positioning protrusions 111 protruding toward the accommodating space 13. The positioning protrusions 111 respectively abut against the periphery 230 of the long rod 23 and the periphery 240 of the short rod 24 to position the long rod 23 and the short rod 24 in the accommodating space 13 so as not to deviate.

[0102] A torque disconnecting device 30 is disposed between a long rod 23 and a short rod 24. The torque disconnecting device 30 has a disconnecting member 31 and an elastic member 32. The disconnecting member 31 has a long plate-shaped body 311, with a second abutting end 312 at one end and a bearing portion 313 at the other end. The bearing portion 313 extends laterally from the body 311 and has an arc-shaped cross-section. In other embodiments, the cross-section of the bearing portion 313 is semi-circular (e.g., ...). Figure 7 Additionally, the disconnector 31 has a pivot portion 314 adjacent to the second abutment end 312.

[0103] The disconnecting member 31 is oscillatingly mounted on the long rod 23 along a third axis L3 parallel to the second axis L2, and is capable of oscillating between a contact position and a disconnect position. The third axis L3 is perpendicular to the virtual horizontal axis Y, and the second contact end 312 extends toward the short rod 24, approaching the virtual horizontal axis Y, to selectively contact the first contact end 242. When the applied force of the mechanical torque wrench 100 reaches a predetermined torque setting value, the second contact end 312 of the disconnecting member 31 can disconnect from the first contact end 242 of the short rod 24, causing the disconnecting member 31 to oscillate from the contact position to the disconnect position, thereby interrupting the transmission of torque and achieving the predetermined torque setting value.

[0104] In this embodiment of the invention, the disconnecting member 31 is pivotally mounted on a pivot hole 233 of the long rod 23 via a pivot ear 314 and a pin 315, so that the disconnecting member 31 swings relative to the long rod 23 between the contact position and the release position.

[0105] In another embodiment of the present invention, the first abutting end 242 of the short rod 24 extends beyond the virtual horizontal axis Y, and the second abutting end 312 of the disconnecting member 31 extends to the virtual horizontal axis Y without crossing it, so that the second abutting end 312 is approximately flush with the virtual horizontal axis Y when in the abutting position. When the disconnecting member 31 and the short rod 24 are in the abutting position, the vertical distance from the third axis L3 to the second axis L2 is less than the vertical distance from the first abutting end 242 to the second axis L2.

[0106] The elastic element 32 is disposed between the long rod 23 and the disconnecting element 31 to maintain the disconnecting element 31 in the abutting position. That is, through the elastic force of the elastic element 32, the second abutting end 312 of the disconnecting element 31 continuously presses against the first abutting end 242 of the short rod 24. In this embodiment of the invention, the elastic element 32 abuts between the body 311 and the groove 234 of the long rod 23, and the position of the elastic element 32 abutting against the body 311 is between the second abutting end 312 and the supporting part 313.

[0107] The torque adjustment device 40 is assembled with the main body 10. The torque adjustment device 40 has a movable base 41, an adjustment member 42, and a rotating member 43. The movable base 41 is rectangular and is slidably disposed in the accommodating space 13 to support the bearing portion 313 of the disconnecting member 31 away from the second abutment end 312. The adjustment member 42 is rotatably disposed between the movable base 41 and the main body 10 along a fourth axis L4 parallel to the third axis L3. The adjustment member 42 is exposed on the bottom surface 15 of the main body 10 and can be rotated to drive the movable base 41 to move along a direction parallel to the first axis L1, and change the force of the second abutment end 312 of the long rod 23 against the first abutment end 242 of the short rod 24, thereby adjusting the torque setting value of the mechanical torque wrench 100.

[0108] The movable seat 41 is provided with a linearly inclined groove 411 and a first tooth 412 away from the groove 411. The top surface 14 and bottom surface 15 of the body 10 are arranged along the fourth axis L4, with the groove 411 facing the top surface 14 and the adjusting member 42 facing the bottom surface 15. The distal end 232 of the long rod 23 extends into the movable seat 41, and the bearing portion 313 of the disconnecting member 31 extends into the movable seat 41 and abuts against the inner wall 4111 of the groove 411. The elastic force of the elastic member 32 is applied to the body 311 of the disconnecting member 31 to keep the bearing portion 313 abutting against the inner wall 4111 of the groove 411. Further, the movable seat 41 is provided with a movable groove 413 along a direction parallel to the first axis L1, the first tooth 412 is provided on one side of the inner edge of the movable groove 413, and the movable seat 41 is provided with an elongated groove 414 along a direction parallel to the first axis L1 on one side of the movable groove 413.

[0109] In this embodiment of the invention, a mounting hole 415 facing the scale hole 141 is provided between the first tooth 412 and the inclined groove 411. A torque indicator 44 is installed in the mounting hole 415. The torque indicator 44 is exposed in the scale hole 141 and is used to indicate the torque scale.

[0110] The adjusting member 42 is disc-shaped. The adjusting member 42 has a rod portion 421 extending through the body 10 and the movable seat 41. A rotating member 43 is connected and sleeved on the rod portion 421 of the adjusting member 42 along the fourth axis L4. The rotating member 43 has a second tooth portion 431 that meshes with the first tooth portion 412. Furthermore, the rotation radius of the adjusting member 42 is larger than the rotation radius of the second tooth portion 431, so that the user can easily operate the adjusting member 42 to move the movable seat 41, thereby quickly adjusting the torque setting value.

[0111] like Figure 4 and Figure 8 As shown, in another embodiment of the present invention, a braking device 50 is assembled between the movable base 41 and the main body 10. The braking device 50 can switch between a release position and a braking position. And in conjunction with... Figure 8 and Figure 9 In the released position, the movable seat 41 can be displaced, causing the inclined groove 411 to slide relative to the bearing part 313. Figure 4 and Figure 5 In the braking position, the braking device 50 clamps the movable seat 41 and the body 10, so that the movable seat 41 cannot move relative to the body 10. In this way, the mechanical torque wrench 100 will not make micro-movements during the application of force, and the torque performance can be more accurate and without distortion.

[0112] The braking device 50 further includes a shaft 51, an operating member 52, and a pressing member 53. The shaft 51 extends along the fourth axis L4 between the main body 10 and the movable seat 41 and protrudes from the bottom surface 15 of the main body 10 for the operating member 52 to pivotally mount. A threaded fastener 511 is provided at the end of the shaft 51 away from the operating member 52, and a through hole 16 facilitates screwing the threaded fastener 511 onto the shaft 51. The operating member 52 has an eccentric cam 521 pivotally mounted on the shaft 51, allowing the user to selectively pivot the operating member 52 relative to the shaft 51, causing the operating member 52 to drive the shaft 51 to move along the fourth axis L4. The pressing member 53 is located at the end of the shaft 51 away from the operating member 52, and the pressing member 53 is slidably connected to the rod portion 421 of the adjusting member 42.

[0113] In the braking position, the operating member 52 pulls the shaft 51 along the fourth axis L4, causing the adjusting member 42 and the pressing member 53 to press against each other. The adjusting member 42 presses against the body 10, and the pressing member 53 is pressed against the movable seat 41 by the force applied by the eccentric cam 521, thereby clamping the body 10 and the movable seat 41. In the release position, the operating member 52 is released relative to the shaft 51, allowing the user to rotate the adjusting member 42, thereby causing the movable seat 41 to slide relative to the body 10 along a direction parallel to the first axis L1.

[0114] In this embodiment of the invention, a torque fine-tuning device 60 is provided between the body 10 and the long rod 23. The torque fine-tuning device 60 includes an adjusting screw 61 and a limiting screw 62. The adjusting screw 61 is transversely inserted through the long slot 414 of the body 10, the moving seat 41, and the through hole 235 of the distal end 232 of the long rod 23. The limiting screw 62 is inserted through the body 10 and screwed to the adjusting screw 61, so that the adjusting screw 61 can be rotated by a tool to fine-tune the displacement of the distal end 232, thereby fine-tuning the torque setting value.

[0115] Please see Figures 5 to 7 As shown, the bearing portion 313 of the disconnector 31 abuts against the end of the inclined groove 411 away from the torque indicator 44. In this position, the contact area between the second abutting end 312 of the disconnector 31 and the first abutting end 242 of the short rod 24 is relatively large (compared to...). Figure 9 The force exerted on the disconnector 31 against the short rod 24 is relatively large, thus maximizing the torque setting of the mechanical torque wrench 100. Therefore, during the turning process, when the applied torque reaches the maximum setting value, the bearing part 313 of the disconnector 31 will slide along the inclined groove 411 due to the force exceeding its bearing limit. The second abutting end 312 of the disconnector 31 will then separate from the first abutting end 242 of the short rod 24, thereby disconnecting the force applied by the mechanical torque wrench 100 to avoid damage to the bolts or fasteners caused by excessive force.

[0116] Because the second abutting end 312 of the disconnecting member 31 does not cross the virtual horizontal axis Y of the long rod 23, or is designed to be approximately flush with the virtual horizontal axis Y, the abutting relationship between the disconnecting member 31 and the short rod 24 can produce a disconnecting action when the torque setting value reaches the predetermined value, without the need for other components or devices, thus eliminating the need for additional components to be set up and assembled.

[0117] like Figure 9 As shown, by adjusting the position of the movable seat 41, the bearing portion 313 of the disconnector 31 abuts against the end of the inclined groove 411 near the torque indicator 44. In this position, the disconnector 31 is relatively inclined relative to the first axis L1, resulting in a smaller contact area between its second abutting end 312 and the first abutting end 242 of the short rod 24 (compared to...). Figure 5This reduces the force exerted on the disconnector 31 against the short lever 24, thus minimizing the torque setting of the mechanical torque wrench 100.

[0118] Please cooperate. Figure 5 , Figure 6 , Figure 7 , Figure 9 and Figure 10 As shown, where, Figure 10 This is a graph showing the torque setting value / actual torque value of the present invention. The present invention adjusts the set torque by changing the angle of the disconnector 31 by adjusting the displacement of the movable seat 41 along the first axis L1. Because the slope of the inclined groove 411 of the movable seat 41 is linear, the angle of the disconnector 31 and the position of the movable seat 41 are linearly related, allowing the torque setting value of the present invention to be very close to the actual torque value, thereby achieving better torque performance.

[0119] In summary, the short rod 24 and the disconnecting member 31 of this invention employ the aforementioned special abutment design, enabling the disconnection action to be achieved when the torque reaches a set value without the need for additional components or devices. This design eliminates the need for additional component configuration and assembly steps, effectively simplifying the structure, improving not only the efficiency of precision manufacturing but also the stability and reliability of the assembly process.

[0120] Furthermore, the pivot ear 314 of the disconnecting member 31 is pivotally mounted on the pivot hole 233 of the long rod 23 via the pin 315. That is, the disconnecting member 31 can pivot relative to the long rod 23 about the third axis L3, and the third axis L3 is perpendicular to the virtual horizontal axis Y. The first abutting end 242 of the short rod 24 extends beyond the virtual horizontal axis Y, that is, the first abutting end 242 of the short rod 24 extends beyond the third axis L3, so that the second abutting end 312 of the disconnecting member 31 abuts against the first abutting end 242 of the short rod 24, and is held in the area of ​​the virtual horizontal axis Y facing the second end 12 of the body 10, rather than in the area of ​​the virtual horizontal axis Y facing the first end 11 of the body 10. The advantage of this design is that it makes the torque release of the mechanical torque wrench 100 of the present invention more sensitive and has a sharp disconnecting and releasing effect.

[0121] The embodiments described above are merely illustrative of the present invention and are not intended to limit the scope of the invention. All modifications or alterations made without departing from the spirit of the present invention are within the scope of the patent applications of this invention.

Claims

1. A mechanical torque wrench, characterized in that, include: A body having a first end and a second end away from the first end along a first axis, with an accommodating space between the first end and the second end; A lever has a drive unit and a long rod and a short rod opposite to the drive unit. The drive unit is rotatable along a second axis perpendicular to the first axis to drive a fastener. The long rod and the short rod extend into the receiving space from the first end direction. The long rod defines a virtual transverse axis. The short rod has a first abutting end on the side away from the drive unit. A torque disconnecting device is disposed between a long rod and a short rod. The torque disconnecting device has a disconnecting member that is oscillatingly disposed on the long rod along a third axis parallel to the second axis. The disconnecting member can oscillate between a contact position and a disconnect position. The third axis is perpendicular to the virtual horizontal axis. The disconnecting member has a second contact end that extends toward the short rod and approaches the virtual horizontal axis to selectively contact the first contact end. When the force applied by the mechanical torque wrench reaches a preset torque value, the second contact end of the disconnecting member can disconnect from the first contact end of the short rod, causing the disconnecting member to oscillate from the contact position to the disconnect position. as well as A torque adjustment device is assembled with the body. The torque adjustment device has a movable seat and an adjustment member. The movable seat is slidably disposed in the accommodating space to support the end of the disconnecting member away from the second abutment end. The adjustment member is rotatably disposed between the movable seat and the body along a fourth axis parallel to the third axis. The adjustment member is exposed on one side of the body and can be rotated to drive the movable seat to move along a direction parallel to the first axis and change the force of the second abutment end against the first abutment end.

2. The mechanical torque wrench as described in claim 1, characterized in that, The first abutment extends beyond the virtual horizontal axis, the second abutment extends to the virtual horizontal axis without crossing it, and when the disconnecting member and the short rod are in the abutment position, the vertical distance from the third axis to the second axis is less than the vertical distance from the first abutment to the second axis.

3. The mechanical torque wrench as described in claim 2, characterized in that, The movable seat is provided with an inclined groove and a first tooth portion away from the inclined groove. The disconnecting member has a bearing portion away from the second abutting end, and the bearing portion extends into the movable seat and abuts against the inclined groove. The torque adjusting device has a rotating member connected to the adjusting member along the fourth axis, and the rotating member has a second tooth portion that meshes with the first tooth portion.

4. The mechanical torque wrench as described in claim 3, characterized in that, The torque disconnection device includes an elastic element disposed between the long rod and the disconnection member, which is used to keep the bearing part abutting against an inner wall of the inclined groove and to keep the disconnection member in the abutting position; the bearing part has an arc-shaped cross section.

5. The mechanical torque wrench as described in claim 4, characterized in that, The disconnecting member has a long plate-shaped body, the second abutting end is located at one end of the body, the supporting part is located at the other end of the body and extends laterally from the body, and the elastic member abuts the body at a position between the second abutting end and the supporting part.

6. The mechanical torque wrench as described in claim 3, characterized in that, The main body has a top surface and a bottom surface arranged opposite to it along the fourth axis. The inclined groove faces the top surface, and the adjusting member faces the bottom surface. The top surface has a scale hole arranged along the direction parallel to the first axis. The scale hole communicates with the receiving space. There is a mounting hole facing the scale hole between the first tooth and the inclined groove. A torque indicator is installed in the mounting hole and is exposed in the scale hole.

7. The mechanical torque wrench as described in claim 3, characterized in that, The movable seat is rectangular and has a movable groove arranged along a direction parallel to the first axis. The first tooth is provided on one side of the inner edge of the movable groove. The movable seat has an elongated groove arranged along a direction parallel to the first axis on one side of the movable groove. The lever device has a lever member. The driving part is detachably provided at one end of the lever member. The long rod and the short rod are fixed at one end of the lever member. The side of the long rod away from the lever member has a distal end that extends into the movable seat. A torque fine-tuning device is provided between the body and the long rod.

8. The mechanical torque wrench as described in claim 7, characterized in that, The long rod has a first fixed end away from the far end, and the short rod has a second fixed end away from the first abutting end. The lever has a first fixed hole and a second fixed hole arranged in parallel and not communicating with each other. The first fixed end extends into the first fixed hole for positioning, and the second fixed end extends into the second fixed hole for positioning. The cross-sections of the first fixed hole, the second fixed hole, the first fixed end, and the second fixed end are all square.

9. The mechanical torque wrench as described in claim 8, characterized in that, The first fixing hole has four first abutting surfaces, which are connected by a first arc-shaped groove, and these first abutting surfaces abut against the four peripheral sides of the first fixing end; the second fixing hole has four second abutting surfaces, which are connected by a second arc-shaped groove, and these second abutting surfaces abut against the four peripheral sides of the second fixing end.

10. The mechanical torque wrench as described in claim 3, characterized in that, It also includes a braking device disposed between the movable seat and the body. The braking device can switch between a release position and a braking position. In the release position, the movable seat can be displaced and the inclined groove and the bearing portion can slide relative to each other. In the braking position, the braking device clamps the movable seat and the body, so that the movable seat cannot move relative to the body.

11. The mechanical torque wrench as described in claim 10, characterized in that, The main body has a top surface and an oppositely arranged bottom surface along the fourth axis. The braking device also includes a shaft, an operating member, and a pressing member. The shaft extends along the fourth axis between the main body and the movable seat and protrudes from the bottom surface of the main body for pivoting the operating member. The operating member has an eccentric cam pivotally mounted on the shaft, allowing the user to selectively pivot the operating member relative to the shaft, causing the operating member to drive the shaft to move along the fourth axis. The pressing member is located on the shaft away from the operating member. One end of the member is connected to the pressing member and the adjusting member in a sliding connection. In the braking position, the operating member pulls the shaft along the fourth axis, causing the adjusting member and the pressing member to press against each other, so that the adjusting member presses against the body and the pressing member is pressed against the movable seat by the force of the eccentric cam, thereby clamping the body and the movable seat. In the release position, the operating member is relaxed relative to the shaft, so that the user can rotate the adjusting member and drive the movable seat to slide relative to the body in a direction parallel to the first axis.

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