Ratchet wrench with overload protection function

Abstract

The invention relates to a ratchet wrench with an overload protection function, and belongs to the technical field of ratchet wrenches. The ratchet wrench comprises a wrench body and a ratchet head, a torque release structure for measuring torque is arranged in the wrench body and comprises a pressure spring, a torque release joint and a torque ejector rod, and the torque ejector rod is fixedly connected with the ratchet head. The overload protection structure is connected with the torque release structure and the ratchet head and comprises a driving head arranged on the torque ejector rod, a breaking piece for the driving head to push and break and a connecting rod assembly connected with the breaking piece, and the other end of the connecting assembly corresponds to the driving strip. And the wrench main body is provided with a protective shell for mounting the breaking piece and the connecting rod assembly. The ratchet wrench is protected through the overload protection structure, and the probability that the wrench is damaged due to excessive rotation is reduced.

Description

Technical Field

[0001] The present application relates to a wrench, and more particularly to a ratchet wrench with overload protection. Background Art

[0002] A wrench is a commonly used installation and disassembly tool that mainly uses the lever principle to turn bolts, screws, nuts, and other threaded fasteners. Wrenches can be classified into open-end wrenches, socket wrenches, ratchet wrenches, etc. according to different designs and uses.

[0003] The current ratchet wrench includes a wrench body, a ratchet head provided at one end of the wrench body, and a socket that is detachably fitted to the ratchet head. Components such as a ratchet, a pawl, a spring, and a drive bar are provided inside the ratchet head. The ratchet mechanism inside the ratchet head allows the wrench to rotate freely in one direction and locks in the opposite direction, enabling the operator to easily tighten or loosen bolts or nuts without changing the holding position.

[0004] To further accurately control the torque of the ratchet wrench, a torque release structure is usually provided inside the wrench body. The torque release structure consists of a pressure spring, a torque release joint, and a torque ejector rod. Before use, the required torque value is set first, and the spring is sleeved on the ejector rod to apply pressure to the torque release joint. When starting to tighten the bolt, as the torque increases, when the set value is reached, the spring is compressed to the limit, the torque release joint produces an instantaneous disconnection effect, and at the same time, a "click" sound is emitted to remind the operator that the set torque value has been reached.

[0005] However, during actual use by the operator, it is easy to apply too much force at once or make a misoperation, resulting in the wrench continuing to rotate even after reaching the torque value. Over-tightening the wrench can damage the bolts and nuts, and even affect the subsequent measurement accuracy of the torque release structure. Summary of the Invention

[0006] In order to reduce the probability of damage to the wrench caused by excessive rotation, the present application provides a ratchet wrench with overload protection.

[0007] The ratchet wrench with overload protection provided by the present application adopts the following technical solutions: A ratchet wrench with overload protection, comprising a wrench body and a ratchet head. A torque release structure for measuring the magnitude of torque is provided inside the wrench body. The torque release structure includes a pressure spring, a torque release joint, and a torque ejector rod. The torque ejector rod is fixedly connected to the ratchet head. An overload protection structure connecting the torque release structure and the ratchet head is further included. The overload protection structure includes a driving head provided on the torque ejector rod, a breaking member pushed by the driving head to break, and a connecting rod assembly connecting the breaking member. The other end of the connecting assembly is correspondingly arranged with a driving bar. The wrench body is provided with a protection housing for installing the breaking member and the connecting rod assembly.

[0008] By adopting the above technical solution, when the user rotates the wrench body, after the torque release joint of the torque release structure disengages, the wrench reaches the preset torque value. Through the setting of the overload protection structure, when the wrench continues to rotate at the preset torque value, the driving head moves towards the breaking member, causing the breaking member to break. The breaking member drives the connecting rod assembly to rotate, and the rotation of the connecting rod assembly drives the driving bar to rotate. The driving bar moves between the two pawls, causing both the two pawls and the ratchet teeth to be in a disengaged state, and the rotation of the wrench is an idling rotation, reducing the probability of damage to the bolt and nut caused by excessive rotation of the wrench.

[0009] Optionally, the breaking member includes a sliding shaft body, a first elastic member sleeved on the sliding shaft body, and a locking hook provided at the other end of the sliding shaft body. A locking ring for cooperating with and locking the locking hook is provided inside the protection housing.

[0010] By adopting the above technical solution, the structural composition of the breaking member is disclosed. When the wrench is in normal use, the sliding shaft body is in a locked state through the cooperation of the locking hook and the locking ring. When the wrench rotates excessively, the sliding shaft body breaks, and the first elastic member drives the sliding shaft body to reset, thereby driving the rotation of the connecting rod assembly. The cooperation between the above-mentioned breaking member and the protection housing is simple and convenient for assembly.

[0011] Optionally, a fixing ring for fixing the first elastic member is provided on the side wall of the sliding shaft body. A breaking groove is provided on the sliding shaft body between the fixing ring and the locking hook, and the breaking groove is correspondingly arranged with the driving head.

[0012] By adopting the above technical solution, the setting of the breaking groove makes it convenient for the driving head to impact the breaking groove when the wrench rotates excessively, causing the sliding shaft body to break and improving the safety performance.

[0013] Optionally, the first elastic member is a tension spring member. The wrench body is provided with a driving through hole communicating with the protection housing. A cutting tool head corresponding to the driving through hole is slidably installed in the protection housing, and the breaking member is pushed by the cutting tool head.

[0014] By adopting the above technical solution, the structural form of the first elastic member is specifically disclosed. By using a cutting tool head, the driving head indirectly impacts and fractures the sliding shaft body, reducing the direct friction and collision between the torque ejector rod and the sliding shaft body, and reducing the risk of wear and damage.

[0015] Optionally, the connecting rod assembly includes a connecting rod member rotatably arranged in the protective housing and a second elastic member. The connecting rod member includes a first rod body and a second rod body respectively facing the fracture member and the driving strip. The first rod body is provided with a first driving surface for the sliding shaft body to push, and the second rod body is provided with a pushing block for pushing the driving strip. After the first elastic member is reset, the sliding shaft body pushes the first driving member to drive the second rod body to rotate towards the driving strip direction.

[0016] By adopting the above technical solution, the structural composition of the connecting rod assembly is disclosed. The two ends of the connecting rod member serve as the two ends of the lever respectively. When the sliding shaft body slides under the action of the first elastic member, the sliding shaft body pushes the first rod body to rotate, and the second rod body drives the driving strip to rotate. The structure is simple and the separation of the ratchet teeth and the ratchet pawl is realized.

[0017] Optionally, two sets of connecting rod assemblies are arranged in the protective housing, and the two sets of connecting rod assemblies are respectively arranged on both sides of the torque ejector rod.

[0018] By adopting the above technical solution, the cooperative setting of the two sets of connecting rod assemblies can enable the ratchet wrench to have an overload protection function in both rotation states. After one set of connecting rod assemblies is driven, it will not affect the other set of connecting rod assemblies.

[0019] Optionally, the protective housing is slidably provided with a fracture groove body installed with the fracture member. The protective housing is provided with a protective through hole for the fracture groove body to slide out on the side away from the connecting rod assembly, and the protective housing is installed with a cover plate at the protective through hole.

[0020] By adopting the above technical solution, after the overload protection structure is triggered, the sliding shaft body needs to be replaced. The setting of the fracture groove body enables the sliding shaft body to be replaced without completely removing the protective housing. The sliding shaft body can be replaced by pulling out the fracture groove body from the protective housing, and the replacement is simple.

[0021] Optionally, a fracture part is detachably installed on the sliding shaft body. The fracture groove is located at the fracture part. The sliding shaft body is provided with a plugging groove, the sliding fracture part is provided with a plug joint matched with the plugging groove, an elastic plunger is arranged on the side wall of the plug joint, and a locking groove matched with the elastic plunger is arranged on the inner wall of the plugging groove of the sliding shaft body.

[0022] By adopting the above technical solution, the cooperation between the fracture part and the sliding shaft body enables the replacement of the overload protection structure to only replace the fracture part. The connection structure between the fracture part and the sliding shaft body is stable, the replacement is convenient, and the replacement cost of the overload protection structure is reduced.

[0023] Optionally, warning blocks are further arranged on both sides of the torque ejector rod in the driving head, and an impact surface corresponding to the warning blocks is arranged on the inner wall of the wrench body.

[0024] By adopting the above technical solution, the setting of the warning blocks enables the torque ejector rod to rotate after the wrench body reaches the preset value, so that the warning blocks first abut against the inner side wall of the wrench body, and the user can hear the impact sound, achieving a warning effect.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: Through the setting of the overload protection structure in the present application, when the wrench body still rotates after reaching the preset value, the driving head abuts against the fracture part, causing the fracture part to break. The fracture part drives the connecting rod assembly to rotate, and the connecting rod assembly pushes the driving bar, causing the ratchet pawl and the ratchet wheel to disengage. The rotation of the wrench is an idle rotation, which plays a protective effect on the board and improves the service life. Through the setting of the fracture groove body in the present application, it is convenient for the user to draw out the fracture groove body from the protective housing and replace the fracture part, improving the replacement efficiency. Through the disassembly and assembly cooperation between the fracture part and the sliding shaft body in the present application, only the fracture part needs to be replaced during maintenance. The connection structure between the fracture part and the sliding shaft body is simple, and the disassembly and assembly are convenient, further improving the replacement efficiency of the fracture part. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the overall structural schematic diagram of an embodiment of the present application.

[0027] Figure 2 is the cross-sectional schematic diagram of an embodiment of the present application with only one set of overload protection structure installed.

[0028] Figure 3 is the cross-sectional schematic diagram of the warning block and the wrench body of an embodiment of the present application.

[0029] Figure 4 is the structural schematic diagram of the overload protection structure of an embodiment of the present application.

[0030] Figure 5 is the structural schematic diagram of an embodiment of the present application without the protective housing installed.

[0031] Figure 6 is the structural schematic diagram of the connecting rod assembly of an embodiment of the present application.

[0032] Description of reference numerals: 1, wrench body; 11, assembly chamber; 12, impact surface; 13, driving through-hole; 2, ratchet head; 21, driving strip; 3, torque release structure; 31, pressure spring; 32, torque release joint; 33, torque ejector rod; 331, warning chute; 332, warning locking groove; 333, communicating chute; 334, return spring; 34, fixed cushion block; 35, adjusting column; 4, overload protection structure; 41, driving head; 42, fracture piece; 421, sliding shaft body; 4211, fixing ring; 4212, insertion slot; 4213, locking groove; 422, first elastic member; 423, locking hook; 424, fracture portion; 4241, fracture groove; 4242, insertion head; 4243, elastic plunger member; 43, connecting rod assembly; 431, connecting rod member; 4311, first rod body; 43111, first driving surface; 4312, second rod body; 43121, pushing block; 432, second elastic member; 44, protection housing; 441, locking ring; 442, fracture groove body; 443, protection through-hole; 45, warning block; 451, ball head plunger member; 46, cutting tool head. Detailed implementation manners

[0033] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the disclosed embodiments of the present invention can be arranged in different directions, these terms indicating directions should only be used as illustrations and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0034] The following will further describe the present application in detail with reference to the Figures 1-6 accompanying drawings.

[0035] An embodiment of the present application discloses a ratchet wrench with overload protection.

[0036] Refer to Figure 1 and Figure 2A ratchet wrench with overload protection includes a wrench body 1 and a ratchet head 2. A torque release structure 3 for measuring torque is installed in the wrench body 1. The structure of the ratchet head 2 is consistent with the ratchet wrench in the prior art. A ratchet, two groups of pawls cooperating with the ratchet, and a rotating block arranged between the two groups of pawls are installed in the ratchet head 2. A driving bar 21 connected to the rotating block is rotatably installed on the outer side of the ratchet head 2. The rotation of the rotating block is controlled by manually toggling the driving bar 21, so that one group of pawls is controlled to cooperate with the ratchet.

[0037] The wrench body 1 has an assembly chamber 11 for installing a torque release structure 3, and the torque release structure 3 includes a pressure spring 31, a torque release joint 32, and a torque push rod 33. A fixed pad 34 and an adjustment column 35 are respectively installed at both ends of the pressure spring 31. The end of the fixed pad 34 has a slot for installing the torque release joint 32. The torque push rod 33 and the ratchet head 2 are integrally arranged. The torque push rod 33 is inserted into the assembly chamber 11 and is engaged with the torque release joint 32. The end of the torque push rod 33 away from the torque release joint 32 is rotatably matched with the wrench body 1 through a hinge shaft.

[0038] The adjusting column 35 is threadedly mounted on the inner wall of the assembly chamber 11, and the tension of the pressure spring 31 is adjusted by changing the position of the adjusting column 35 in the assembly chamber 11. When the operator turns the wrench to reach a preset torque value, the tension of the pressure spring 31 is overcome, so that the torque release joint 32 is separated from the fixed pad 34, and one end of the torque push rod 33 hits the inner wall of the assembly chamber 11.

[0039] In order to reduce the damage to the torque release structure 3 caused by excessive rotation, the wrench of the present application is provided with an overload protection structure 4. The overload protection structure 4 includes a drive head 41 provided on the torque push rod 33, a breaking piece 42 for the drive head 41 to push and break, and a connecting rod assembly 43 for driving the drive bar 21 to rotate. A protective housing 44 for the overload protection structure 4 is installed on the outside of the wrench body 1.

[0040] Reference Figure 2 and Figure 3 The drive head 41 is integrally arranged on opposite sides of the end of the torque push rod 33, and the protective shell 44 is fixed to the outside of the wrench body 1 by bolts or the like. The wrench body 1 has a drive through hole 13 connected to the inner cavity of the protective shell 44 and corresponding to the drive head 41, and the inner diameter of the drive through hole 13 is larger than the drive head 41.

[0041] The drive head 41 is also provided with warning blocks 45 on opposite sides, and the assembly chamber 11 is provided with a collision surface 12 for the warning block 45 to abut against. The collision surface 12 is made of a high-rigidity material, so that the warning block 45 can produce a relatively clear sound after hitting the collision surface 12, which serves as a reminder to the user and reduces the probability of over-rotation.

[0042] The side wall of the warning block 45 is provided with a ball plunger 451, and the torque ejector rod 33 has a warning chute 331 for the warning block 45 to slide and install. The inner wall of the warning chute 331 is spaced with warning locking grooves 332 that cooperate with the ball plunger 451 for locking. The warning chute 331 also has a communicating chute 333 on one side of the warning locking groove 332, so that the ball plunger 451 can only slide back and forth between the warning locking groove 332 and the communicating chute 333. There is also a return spring 334 between the end of the warning block 45 and the bottom wall of the warning chute 331. The return spring 334 selects an appropriate elastic strength so that the warning block 45 remains in a normal state after hitting the wrench body 1, and the driving head 41 does not abut against the fracture part 42. When the warning block 45 hits the impact surface 12, if the wrench is rotated further, it will cause the warning block 45 to move towards the bottom wall of the warning chute 331, so that the driving head 41 passes through the driving through hole to the protection housing 44.

[0043] Refer to Figure 4 and Figure 5 , the fracture part 42 includes a sliding shaft body 421, a first elastic member 422 and a locking hook 423. The sliding shaft body 421 is slidably installed in the protection housing 44, and the sliding direction of the sliding shaft body 421 is staggered with the moving direction of the driving head 41. The first elastic member 422 is a tension spring member, one end of which is fixed to the protection housing 44 and the other end abuts against the sliding shaft body 421. The sliding shaft body 421 has a fixing ring 4211 for fixing the other end of the first elastic member 422.

[0044] The sliding shaft body 421 is detachably provided with a fracture part 424 corresponding to the driving through hole at one end of the fixing ring 4211 away from the first elastic member 422, and the locking hook 423 is arranged at the end of the fracture part 424. There is a locking ring 441 in the protection housing 44 that cooperates with the locking hook 423. When the sliding shaft body 421 is in a normal working state, the locking hook 423 and the locking ring 441 cooperate and lock, and the first elastic member 422 is in a stretched state.

[0045] The fracture part 424 is provided with a fracture groove 4241, the cross section of the fracture groove 4241 is V-shaped, and the opening side of the fracture groove 4241 faces away from the driving head 41, so that when the driving head 41 presses the fracture groove 4241, the fracture part 424 can be broken into two parts, and the first elastic member 422 resets, driving the sliding shaft body 421 to move.

[0046] The end of the fracture part 424 is provided with a plug joint 4242, and the end of the sliding shaft body 421 has a plugging groove 4212 that is plugged and matched with the plug joint 4242. The side wall of the plug joint 4242 is provided with an elastic plunger 4243, and the structure of the elastic plunger 4243 is the same as that of the ball plunger, including a plunger housing, a plunger spring and a plunger ball head. The sliding shaft body 421 is provided with a locking groove 4213 on the inner wall of the plugging groove 4212 that cooperates with the plunger ball head for locking.

[0047] The protective housing 44 is slidably mounted with a cutting tool head 46 at the driving through-hole, and the driving head 41 indirectly abuts and presses the fracture part 424 through the cutting tool head 46.

[0048] In some embodiments, in order to facilitate the quick replacement after the fracture of the fracture part 424, a fracture groove body 442 is further provided in the protective housing 44, and the fracture piece 42 and the locking ring 441 are both installed in the fracture groove body 442. The fracture groove body 442 is connected to the protective housing 44 through a clamping structure, and the clamping structure includes a clamping buckle provided on the fracture groove body and a clamping groove provided on the protective housing. The protective housing 44 is provided with a protective through-hole 443 for the fracture groove body 442 to slide out on the side away from the connecting rod assembly 43. When the fracture piece 42 needs to be replaced, first disengage the clamping buckle from the clamping groove, and then slide the fracture groove body 442 out from one side of the protective through-hole 443. In order to further facilitate the replacement, a handle structure can be provided at the end of the fracture groove body 442.

[0049] Combined with Figure 6 , the connecting rod assembly 43 includes a connecting rod member 431 rotatably mounted on the protective housing 44 and a second elastic member 432 for driving the connecting rod member 431 to reset. The connecting rod member 431 includes a first rod body 4311 and a second rod body 4312 respectively facing the fracture piece 42 and the driving strip 21. A first driving surface 43111 for the sliding shaft body 421 to push is provided at the end of the first rod body 4311, and the first driving surface 43111 is an inclined surface. A pushing block 43121 for pushing the driving strip 21 is provided on the second rod body 4312. The second elastic member 432 is a spring member.

[0050] The driving strip 21 is rotatably mounted on the ratchet head 2, and the overall structure of the driving strip 21 is the same as that of the connecting rod member 431. The driving strip 21 has a protection part for the second rod body 4312 to push.

[0051] The implementation principle of a ratchet wrench with overload protection in an embodiment of the present application is as follows: When the user rotates the main body of the wrench, after the wrench reaches the preset torque value, the torque release block disengages, and then the torque ejector rod 33 rotates, so that the warning block 45 abuts against the impact surface 12 for preliminary warning; Continue to rotate the wrench main body 1, so that the warning block 45 contracts inward, and the driving block drives the cutting tool head 46 to abut and press the fracture part 424, so that the fracture part 424 fractures. The sliding shaft body 421 moves under the action of the first elastic member 422, driving the connecting rod assembly 43 to rotate, so that the ratchet pawl cooperating with the ratchet at this time disengages, and the wrench is in an idling state at this time, realizing overload protection.

[0052] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A ratchet wrench with overload protection, comprising a wrench body (1) and a ratchet head (2), wherein a torque release structure (3) for measuring torque is arranged in the wrench body (1), the torque release structure (3) comprising a pressure spring (31), a torque release joint (32) and a torque push rod (33), the torque push rod (33) and the ratchet head (2) are fixedly connected, characterized in that: The invention also comprises an overload protection structure (4) connecting the torque release structure (3) and the ratchet head (2), the overload protection structure (4) comprising a drive head (41) arranged on the torque push rod (33), a breaking piece (42) for the drive head (41) to push and break, and a connecting rod assembly (43) connecting the breaking piece (42), the other end of the connecting rod assembly (43) being arranged corresponding to the driving bar (21), and the wrench body (1) being provided with a protective housing (44) for mounting the breaking piece (42) and the connecting rod assembly (43).

2. A ratchet wrench with overload protection according to claim 1, characterized in that: The breaking piece (42) comprises a sliding shaft body (421), a first elastic piece (422) sleeved on the sliding shaft body (421), and a locking hook (423) arranged at the other end of the sliding shaft body (421), and a locking ring (441) for cooperating with the locking hook (423) for locking is arranged in the protective shell (44).

3. A ratchet wrench with overload protection according to claim 2, characterized in that: The side wall of the sliding shaft body (421) is provided with a fixing ring (4211) for fixing with the first elastic member (422); the sliding shaft body (421) is provided with a breaking groove (4241) between the fixing ring (4211) and the locking hook (423); the breaking groove (4241) and the driving head (41) are provided correspondingly.

4. A ratchet wrench with overload protection according to claim 2, characterized in that: The first elastic member (422) is a tension spring member, the wrench body (1) is provided with a driving through hole (13) connected to the protective shell (44), the protective shell (44) is slidably mounted with a cutting head (46) corresponding to the driving through hole (13), and the breaking member (42) is pushed by the cutting head (46).

5. A ratchet wrench with overload protection according to claim 2, characterized in that: The connecting rod assembly (43) comprises a connecting rod member (431) rotatably arranged on the protective housing (44) and a second elastic member (432) abutting against the connecting rod member (431); the connecting rod member (431) comprises a first rod body (4311) and a second rod body (4312) facing the breaking member (42) and the driving bar (21) respectively; the first rod body (4311) is provided with a first driving surface (43111) for being pushed by the sliding shaft body (421); and the second rod body (4312) is provided with a pushing block (43121) for pushing the driving bar (21); When the first elastic member (422) is reset, the sliding shaft (421) pushes the first driving surface (43111), driving the pushing block (43121) to rotate in the direction of the driving bar (21).

6. A ratchet wrench with overload protection according to claim 1, characterized in that: Two groups of connecting rod assemblies (43) are arranged in the protective shell (44); the two groups of connecting rod assemblies (43) are symmetrically arranged along the axis of the wrench body (1), and the two groups of connecting rod assemblies (43) rotate in opposite directions.

7. A ratchet wrench with overload protection according to claim 3, characterized in that: The protection shell (44) is slidably provided with a breaking slot body (442) for mounting the breaking piece (42), and the protection shell (44) is provided with a protection through hole (443) for sliding out the breaking slot body (442) on a side away from the connecting rod assembly (43).

8. A ratchet wrench with overload protection according to claim 7, characterized in that: The sliding shaft body (421) is provided with a detachable breaking portion (424), the breaking groove (4241) is located at the breaking portion (424), the sliding shaft body (421) is provided with a plug-in groove (4212), the breaking portion (424) is provided with a plug connector (4242) that cooperates with the plug-in groove (4212), the plug connector (4242) is provided with an elastic plunger (4243) on a side wall, and the sliding shaft body (421) is provided with a locking groove (4213) that cooperates with the elastic plunger (4243) on the inner wall of the plug-in groove (4212).

9. A ratchet wrench with overload protection according to claim 1, characterized in that: The torque push rod (33) is also provided with early warning blocks (45) on both sides of the driving head (41), and the inner wall of the wrench body (1) is provided with an impact surface (12) corresponding to the early warning blocks (45).

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