A wrench

Abstract

The present invention provides a wrench, which includes a wrench body, a socket hole, a clamping device and a clamping hole. The socket hole penetrates or is recessed in the surface of the wrench body; the clamping device is arranged in the socket hole; the clamping hole is arranged in the middle of the clamping device; the aperture size of the clamping hole is adjustable. The advantages of the present invention are that when there is a small difference between the size of the object to be clamped and the clamping hole, the inner diameter size of the clamping hole can be finely adjusted to eliminate the gap between the wrench and the bolt or nut, so that the clamping surface of the wrench fits well with the surface of the bolt or nut, effectively preventing slipping and enhancing the user's hand feeling. In addition, the present invention can fix the object to be clamped that has become loose after being screwed on the clamping part and will not easily fall off, thereby effectively improving work efficiency.

Description

Technical Field

[0001] The present invention relates to a hand tool, and particularly to a wrench. Background Art

[0002] A wrench is a commonly used installation and disassembly tool, which is a hand tool that uses the lever principle to twist threaded components such as bolts, screws, and nuts. Wrenches usually have openings or socket holes for clamping threaded components at one or both ends of the handle. When in use, an external force is applied to the handle along the thread rotation direction to twist the threaded component.

[0003] A wrench with socket holes at one or both ends of the handle is generally called a socket wrench. The cross-section of its socket hole is designed in different shapes to be suitable for various bolts or nuts of different shapes, such as hexagon wrenches. However, there may be certain tolerances in the sizes of wrenches, bolts, or nuts during production. When in use, there will be a certain gap between the wrench and the surface of the bolt or nut, resulting in a poor fitting effect of the clamping surface, easy slipping, and affecting the feel during operation. When a user twists a fitting, the situation of the fitting becoming loose cannot be detected and responded to in the shortest time, easily causing nuts and other fittings to fall off after being loosened. It is very troublesome to find small nuts in some narrow spaces. On the other hand, for some existing nuts and other fittings, there is a situation of mixed use of metric and imperial sizes, which will cause the socket hole of the wrench not to match the bolt specification, and it is difficult to accurately estimate the difference in size between the two with the naked eye, easily resulting in a situation where the wrench does not match nuts and other fittings, causing damage to the surface of nuts and other fittings. In addition, bolts, nuts, and other fittings are exposed to the air, which may cause corrosion, rust, etc., making the size of the fittings smaller, and also causing a situation where the size of the socket hole of the wrench does not match the size of bolts, nuts, and other fittings.

[0004] Those skilled in the art are committed to developing a new wrench whose inner diameter of the socket hole or the clamping part can be finely adjusted. When there is a small difference between the size of the clamped object (such as a bolt or a nut) and the inner diameter size of the clamping part, its clamping part can automatically adjust the inner diameter size to adapt to the size of the clamped object, so as to eliminate the gap between the wrench and the bolt or nut, make the clamping surface of the wrench fit well with the surface of the bolt or nut, effectively prevent slipping, and enhance the user's feel. Summary of the Invention

[0005] The purpose of the present invention is to provide a wrench to solve the technical problems existing in the socket wrenches of the prior art, such as a large gap between the clamping part of the wrench and the clamped object, a poor fitting effect of the clamping surface, easy slipping, and inconvenient operation.

[0006] To solve the above technical problems, the present invention provides a wrench, which includes a wrench body, a socket hole, a clamping device, and a clamping hole. The socket hole penetrates or is recessed in the surface of the wrench body; the clamping device is arranged in the socket hole; the clamping hole is arranged in the middle of the clamping device; and the aperture size of the clamping hole is adjustable.

[0007] The clamping device includes more than two clamping blocks, which are arranged oppositely and enclose the clamping hole. Among them, the inner hole wall of the clamping hole includes the side walls of the more than two clamping blocks; and the distance between the more than two clamping blocks is adjustable.

[0008] Further, in different embodiments, a clamping block includes a clamping block body, which is a part of a cylinder; a clamping opening, which penetrates the top and bottom of the clamping block body, and its opening direction faces another clamping block; and a clamping surface, which is the inner side wall of the clamping opening.

[0009] Further, in different embodiments, the clamping device further includes a first groove, which is recessed in the inner side wall of the socket hole; a second groove, which is recessed in the outer side wall of a clamping block and is arranged oppositely to the first groove; and a first elastic member, which is snapped into the first groove and the second groove. Among them, the shapes of the first groove, the second groove, and the first elastic member are parts of a ring.

[0010] Further, in different embodiments, the wrench further includes a clamping block installation groove, which is recessed in the inner side wall of the socket hole, and at least one clamping block is installed in the clamping block installation groove.

[0011] Further, in different embodiments, the clamping device further includes a bracket, which is installed in the socket hole; and at least one clamping block is movably installed on the bracket.

[0012] Further, in different embodiments, the bracket includes a columnar frame body, which is snapped into the socket hole; a frame body through hole, which penetrates the top and bottom of the columnar frame body; and more than two installation holes, which respectively penetrate the side wall of the columnar frame body and communicate with the frame body through hole. Among them, each installation hole is movably or fixedly installed with a clamping block, and the inner side wall of the frame body through hole and the clamping surfaces of the more than two clamping blocks enclose the clamping hole.

[0013] Further, in different embodiments, the outer side wall of the columnar frame body is tangent to the inner side wall of the socket hole; a protruding flange is respectively arranged at the top and bottom of the outer side wall of the columnar frame body; and the two flanges are snapped on the surfaces on both sides of the wrench body.

[0014] Further, in different embodiments, the wrench further includes a ratchet ring, which is rotatably installed in the socket hole and sleeved outside the clamping device.

[0015] Further, in different embodiments, the clamping device further includes a first groove recessed from the inner sidewall of the ratchet ring; a second groove recessed from the outer sidewall of a clamping block and disposed opposite to the first groove; and a first elastic member snapped into the first groove and the second groove; wherein the shapes of the first groove, the second groove, and the first elastic member are a part of a ring.

[0016] Further, in different embodiments, the wrench further includes a clamping block mounting groove recessed from the inner sidewall of the ratchet ring, and at least one clamping block is mounted to the clamping block mounting groove.

[0017] Further, in different embodiments, at least one clamping block is movably mounted in the clamping block mounting groove; the clamping block includes a first positioning groove recessed from the surface of the clamping block facing the bottom of the clamping block mounting groove; and a second elastic member disposed in the first positioning groove, one end of which is tangent to the bottom of the first positioning groove and the other end of which is tangent to the bottom of the clamping block mounting groove.

[0018] Further, in different embodiments, at least one clamping block is mounted in the clamping block mounting groove; the clamping block includes a second positioning groove recessed from the surface of the clamping block facing another clamping block; a positioning ball disposed at the notch of the second positioning groove; and a third elastic member disposed in the second positioning groove, one end of which is tangent to or connected to the bottom of the second positioning groove and the other end of which is connected to the positioning ball; a part of the surface of the positioning ball and the clamping surfaces of more than two clamping blocks enclose the clamping hole.

[0019] Further, in different embodiments, the clamping device further includes a bracket mounted inside the ratchet ring; at least one clamping block is movably mounted to the bracket.

[0020] Further, in different embodiments, the bracket includes a columnar frame body snapped into the inner side of the ratchet ring; a frame body through hole penetrating the top and bottom of the columnar frame body; and more than two mounting holes respectively penetrating the sidewall of the columnar frame body and communicating with the frame body through hole; wherein, one clamping block is movably or fixedly mounted in each mounting hole, and the inner sidewall of the frame body through hole and the clamping surfaces of more than two clamping blocks enclose the clamping hole.

[0021] Further, in different embodiments, the outer sidewall of the columnar frame body is tangent to the inner sidewall of the ratchet ring; a protruding flange is respectively provided at the top end and the bottom end of the outer sidewall of the columnar frame body; and the two flanges are snapped onto the surfaces on both sides of the ratchet ring.

[0022] Further, in different embodiments, the wrench further includes a socket groove that is recessed in the inner sidewall of the socket; a pawl that is disposed in the socket groove and meshes with the ratchet ring; and a fourth elastic member that is disposed in the socket groove, with one end connected to the bottom or inner wall of the socket groove and the other end connected to the pawl.

[0023] Further, in different embodiments, the ratchet ring includes a driving portion that is disposed inside the ratchet ring and fixed to the outside of the clamping device; and a ring of teeth that is disposed outside the ratchet ring; the pawl includes a ratchet block, one side surface of which is tangent to the sidewall of the socket groove; ratchet teeth that are disposed on the other side surface of the ratchet block and mesh with the ring of teeth; and an elastic member mounting groove that is disposed on the bottom surface of the pawl for mounting the fourth elastic member; wherein one end of the fourth elastic member is connected to the bottom or inner wall of the socket groove and the other end is connected to the pawl.

[0024] Further, in different embodiments, the cross-section of the clamping hole is kidney-shaped, triangular, rectangular, hexagonal or octagonal.

[0025] Further, in different embodiments, the material of the bracket is hard plastic.

[0026] The beneficial effects of the present invention are as follows: A wrench is provided, the inner diameter size of the clamping portion of which can be finely adjusted. When there is a small difference between the size of the object to be clamped and the clamping portion, the inner diameter size of the clamping portion can automatically adjust to eliminate the gap between the wrench and the bolt or nut, so that the clamping surface of the wrench fits well with the surface of the bolt or nut, effectively preventing slipping and enhancing the user's hand feeling. In addition, the present invention can fix the object to be clamped that has become loose after being screwed on the clamping portion and will not easily fall off, thereby effectively improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall structural schematic diagram in Embodiment 1 of the present invention;

[0028] Figure 2 is the exploded structural schematic diagram of the clamping device in Embodiment 1 of the present invention;

[0029] Figure 3 is the structural schematic diagram of one end of the wrench body with the clamping device removed in Embodiment 1 of the present invention;

[0030] Figure 4 is the transverse sectional structural schematic diagram of one end provided with the clamping device in Embodiment 1 of the present invention;

[0031] Figure 5 is the longitudinal sectional structural schematic diagram of one end provided with the clamping device in Embodiment 1 of the present invention;

[0032] Figure 6 is another schematic diagram of a transverse cross-sectional structure of one end provided with a clamping device in Embodiment 1 of the present invention;

[0033] Figure 7 is a schematic diagram of the transverse cross-sectional structure of one end provided with a clamping device in Embodiment 2 of the present invention;

[0034] Figure 8 is a schematic structural diagram of a bracket in Example 2 of the present invention;

[0035] Figure 9 is a schematic diagram of the longitudinal cross-sectional structure of one end provided with a clamping device in Embodiment 2 of the present invention;

[0036] Figure 10 is a schematic diagram of the transverse cross-sectional structure of one end provided with a clamping device in Embodiment 3 of the present invention;

[0037] Figure 11 It is a schematic diagram of the transverse cross-sectional structure of one end provided with a clamping device in Example 4 of the present invention.

[0038] The components in the figure are marked as follows:

[0039] 100 wrench body, 200 sets of holes, 300 clamping devices, 400 clamped objects;

[0040] 1 first clamping block, 2 second clamping block, 3 clamping hole, 4 bracket;

[0041] 11 first clamping block body, 12 first clamping opening, 13 first clamping surface;

[0042] 21 second clamping block body, 22 second clamping opening, 23 second clamping surface;

[0043] 24 first positioning groove, 25 second elastic member, 26 second positioning groove, 27 positioning ball;

[0044] 28 third elastic member, 29 third positioning groove, 30 fifth elastic member;

[0045] 31 first groove, 32 second groove, 33 first elastic member, 34 clamping block installation groove, 35 sleeve hole groove;

[0046] 41 columnar frame, 42 frame through hole, 43 first mounting hole, 44 second mounting hole, 45 bayonet;

[0047] 51 ratchet ring, 52 ratchet pawl, 53 fourth elastic member, 54 ratchet ring groove;

[0048] 411 flange, 412 flange; 521 ratchet block, 522 ratchet, 523 elastic member mounting groove. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present invention are introduced in detail below with reference to the accompanying drawings of the specification to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and its protection scope is not limited to the embodiments mentioned in the text.

[0050] The directional terms mentioned in the present invention, such as up, down, front, back, left, right, inside, outside, side, top, bottom, top end, bottom end, end, etc., are only the directions in the drawings, which are only used to explain and illustrate the present invention, rather than to limit the protection scope of the present invention.

[0051] When some components are described as "on" another component, the component can be directly placed on the other component; there can also be an intermediate component, the component is placed on the intermediate component, and the intermediate component is placed on the other component. When a component is described as "mounted to" or "connected to" another component, the two can be understood as directly "mounted" or "connected", or a component is indirectly "mounted to" or "connected to" another component through an intermediate component.

[0052] Embodiment 1

[0053] As Figure 1 shown, this embodiment provides a wrench, which includes a wrench body 100, a socket hole 200, and a clamping device 300. The socket hole 200 penetrates through one end of the wrench body 100 or is recessed in the surface on one side of the wrench body 100. The clamping device 300 is fixed to or rotatably mounted in the socket hole 200.

[0054] As Figures 1 - 2 shown, the clamping device 300 includes a first clamping block 1, a second clamping block 2, and a clamping hole 3 which are arranged oppositely. The first clamping block 1 and the second clamping block 2 are movably mounted in the socket hole 200, and the distance between the first clamping block 1 and the second clamping block 2 is adjustable. The clamping hole 3 is arranged in the middle of the clamping device 300, and the clamping hole 3 is sleeved outside a clamped object 400. The clamped object 400 is preferably a bolt or a nut, etc.

[0055] The first clamping block 1 includes a first clamping block body 11, a first clamping opening 12, and a first clamping surface 13. The first clamping block body 11 is a part of a cylinder; the first clamping opening 12 penetrates from the top to the bottom of the first clamping block body 11, and the opening direction of the first clamping opening 12 faces the second clamping block 2; the first clamping surface 13 is the inner side wall of the first clamping opening 12.

[0056] The second clamping block 2 includes a second clamping block body 21, a second clamping opening 22, and a second clamping surface 23. The second clamping block body 11 is a part of a cylinder; the second clamping opening 22 penetrates from the top to the bottom of the second clamping block body 21, and the opening direction of the second clamping opening 22 faces the first clamping block 1; the second clamping surface 23 is the inner side wall of the second clamping opening 22.

[0057] In this embodiment, the two clamping blocks 1 and 2 can enclose a complete circular cylinder. Preferably, the first clamping block 1 is a three-quarter circular cylinder, and the second clamping block 2 is a quarter circular cylinder.

[0058] The clamping hole 3 is formed between the two clamping blocks 1 and 2. Specifically, the clamping hole 3 is a hexagonal hole formed by the first clamping surface 13 and the second clamping surface 23, which is adapted to the shape of the object to be clamped 400 (such as a bolt or a nut). The inner diameter length of the clamping hole 3 where the object to be clamped 400 can be effectively clamped is defined as the clamping width. In this embodiment, in the direction of the central axes (central symmetry axes) of the first clamping block 1 and the second clamping block 2, the distance between the first clamping block 1 and the second clamping block 2 is the clamping width of the clamping hole 3; in the direction of the central axes of the first clamping block 1 and the second clamping block 2, the aperture size of the clamping hole 3 is the clamping width of the clamping hole 3. Since the distance between the first clamping block 1 and the second clamping block 2 is adjustable, the aperture size of the clamping hole 3 is adjustable, and the clamping width of the clamping hole 3 is adjustable.

[0059] As Figures 2 - 3 shown, the clamping device 300 further includes a first groove 31, a second groove 32 and a first elastic member 33. The first groove 31 is recessed in the inner side wall of the sleeve hole 200; the second groove 32 is recessed in the outer side wall of the first clamping block 1; the second groove 32 is disposed opposite to the first groove 31. The cross-sections of the first groove 31 and the second groove 32 are a part of a ring, preferably about three-quarter fan-shaped rings. The first elastic member 33 is preferably a snap ring, which is snapped into the first groove 31 and the second groove 32 for connecting the wrench body 100 and the first clamping block 1. The shape of the snap ring corresponds to the shapes of the first groove 31 and the second groove 32, and the cross-section of the snap ring is also a part of a ring, preferably about three-quarter fan-shaped rings.

[0060] The first elastic member 33 (i.e., the snap ring) can slide at a small angle in the first groove 31 and the second groove 32, so that the first clamping block 1 can rotate at a small angle relative to the sleeve hole 200. The first elastic member 33 has a certain elasticity so that the first clamping block 1 can be installed into the sleeve hole 200 and the gap between the first clamping block 1 and the sleeve hole 200 can be minimized.

[0061] As Figures 2 - 5As shown, this embodiment further includes a clamping block mounting groove 34, whose cross-section is crescent-shaped and recessed from the inner sidewall of the sleeve hole 200. The second clamping block 2 is movably mounted in the clamping block mounting groove 34. The second clamping block 2 includes one or two first positioning grooves 24 and one or two second elastic members 25. The first positioning groove 24 is recessed from the surface of the second clamping block 2 facing the bottom of the clamping block mounting groove 34; the second clamping surface 23 includes two planes, and the two first positioning grooves 24 respectively correspond to these two planes. The second elastic member 25 is preferably a helical spring and is disposed in a first positioning groove 24. One end of it is tangent to or connected to the bottom of the first positioning groove 24, and the other end is tangent to or connected to the bottom of the clamping block mounting groove 34.

[0062] When the clamping device 300 is idle, the second elastic member 25 is in a relaxed state, and the width of the clamping hole of the clamping device 300 in the idle state is smaller than the width of the clamping hole 3 in its working state.

[0063] When the clamping device 300 is in use, the clamping hole 3 is sleeved outside the object to be clamped 400 (such as a bolt or a nut), and the gap between the wrench and the object to be clamped 400 can be eliminated. Under the combined action of the first clamping block 1 and the second clamping block 2, the first clamping surface 13 and the second clamping surface 23 are attached to the outer surface of the object to be clamped 400 and clamp it, so that the clamping surfaces 13 and 23 of the wrench are well attached to the surface of the bolt or nut, effectively preventing slipping.

[0064] Figure 5 This is a schematic diagram of the working state of this embodiment when clamping a hexagonal nut with a relatively large size. As Figure 5 shown, when the size of the object to be clamped (such as a bolt or a nut) is relatively large, the two second elastic members 25 are compressed by force, and the second clamping block 2 moves towards the bottom surface of the clamping block mounting groove 34, and there is a certain gap between the two ends of the first clamping block 1 and the two ends of the second clamping block 2. The larger the size of the object to be clamped, the greater the distance that the second clamping block 2 needs to move, and the greater the gap between the two ends of the first clamping block 1 and the two ends of the second clamping block 2 before rotation; in the extreme state, the second clamping block 2 can even be close to the bottom surface of the clamping block mounting groove 34. When the object to be clamped 400 needs to be loosened or tightened, first, the wrench body 100 rotates clockwise or counterclockwise along the thread direction, the second clamping block 2 rotates a small angle relative to the first clamping block 1, one end of the first clamping block 1 fits with one end of the second clamping block 2, the second clamping block 2 is close to the bottom surface or side surface of the clamping block mounting groove 34, and the two clamping blocks lock the object to be clamped 400; then, the wrench body 100 further rotates clockwise or counterclockwise along the thread direction, and the object to be clamped 400 (such as a bolt or a nut) can be loosened or tightened. During the loosening or tightening process, the object to be clamped 400 is always clamped by the two clamping blocks and will not easily fall off, which can effectively improve work efficiency.

[0065] Figure 6This is a schematic diagram of the working state of this embodiment when clamping a hexagonal nut with a relatively small clamping size. As Figure 6 shown, when the size of the object to be clamped (such as a bolt or a nut) is relatively small, the two ends of the first clamping block 1 are in contact with the two ends of the second clamping block 2, and the second clamping block 2 moves away from the bottom surface of the clamping block installation groove 34. There is a large gap between the second clamping block 2 and the bottom of the clamping block installation groove 34. The smaller the size of the object to be clamped, the greater the moving distance of the second clamping block 2, and the greater the gap between the second clamping block 2 and the bottom of the clamping block installation groove 34. When the object to be clamped 400 needs to be loosened or tightened, first, the wrench body 100 rotates clockwise or counterclockwise along the thread direction. The first clamping block 1 and the second clamping block 2 are driven to rotate a small angle relative to the sleeve hole 200. The end faces at both ends of the first clamping block 1 slide relative to the end faces at both ends of the second clamping block 2, so that the second clamping block 2 abuts against the bottom surface or the side surface of the clamping block installation groove 34, and the first clamping block 1 and the second clamping block 2 lock the object to be clamped 400. The smaller the size of the object to be clamped, the greater the angle of rotation of the second clamping block 2 relative to the sleeve hole 200. Then, the wrench body 100 rotates further clockwise or counterclockwise along the thread direction, so that the object to be clamped 400 (such as a bolt or a nut) can be loosened or tightened. During the loosening or tightening process, the object to be clamped 400 is always clamped by the two clamping blocks and will not easily fall off, which can effectively improve work efficiency.

[0066] In other embodiments similar to this embodiment, the clamping device 300 may further include more than three clamping blocks, which are also installed in the sleeve hole 200; a clamping hole 3 is formed between the multiple clamping blocks, and at least one of the multiple clamping blocks is movably installed on the inner side wall of the sleeve hole 200, and the distance between the multiple clamping blocks is adjustable; the width of the clamping hole 3 in at least one direction is adjustable. When the wrench body 100 rotates preliminarily along the thread, the multiple clamping blocks lock the object to be clamped 400; when the wrench body 100 rotates further along the thread direction, the object to be clamped 400 is tightened or loosened.

[0067] In other embodiments similar to this embodiment, the cross-section of the clamping hole 3 can be waist-shaped, triangular, rectangular, hexagonal, octagonal, etc., corresponding to objects to be clamped 400 (such as bolts or nuts) with different shapes and different specifications.

[0068] In other embodiments similar to this embodiment, like the second clamping block 2, the first clamping block 1 can also be movably installed in a clamping block installation groove 34. In this way, both clamping blocks are movable, so that the distance between the two clamping blocks can be adjusted more greatly, and the width of the clamping hole can be adjusted.

[0069] The beneficial effects of this embodiment are as follows: A wrench is provided, in which two movable clamping blocks are arranged in the socket hole, so that the width of the clamping hole can be adjusted within a small range. When there is a small difference between the size of the object to be clamped and the clamping part, the inner diameter of the clamping hole can automatically adjust to eliminate the gap between the wrench and the bolt or nut, so that the clamping surface of the wrench fits well with the surface of the object to be clamped, effectively preventing slipping and enhancing the user's hand feeling. In addition, the present invention can fix the object to be clamped that becomes loose after being screwed on the clamping part and will not easily fall off, thereby effectively improving work efficiency and effectively preventing the object to be clamped (such as bolts or nuts) from being damaged.

[0070] Embodiment 2

[0071] Most of the technical features of this embodiment are the same as those of Embodiment 1. The different technical features are that in Embodiment 2, the clamping device 300 includes a first clamping block 1 and a second clamping block 2 arranged opposite to each other, and also includes a clamping hole 3 and a bracket 4. The bracket 4 is an annular cylinder and is installed in the socket hole 200. The first clamping block 1 is fixed to the bracket 4, and the second clamping block 2 is movably installed on the bracket 4. The distance between the first clamping block 1 and the second clamping block 2 is adjustable.

[0072] As Figures 7 - 8 shown, the bracket 4 includes a columnar frame body 41 and a frame body through hole 42. The outside of the columnar frame body 41 is a cylinder and is clamped into the socket hole 200; the frame body through hole 42 penetrates through the top and bottom of the columnar frame body 41, and the cross-section of the frame body through hole 42 is hexagonal. The outer side wall of the columnar frame body 41 is tangent to the inner side wall of the socket hole 200; flanges 411 and 412 protrude from the top end and the bottom end of the outer side wall of the columnar frame body 41 respectively; the two flanges 411 and 412 are clamped on both sides of the wrench body 100 to install the bracket 4 in the socket hole 200. The material of the columnar frame body 41 is hard plastic, which has a certain hardness and toughness.

[0073] Two opposite bayonets 45 are provided on the outer side wall of the bracket 4, which are arranged opposite to the protruding buckles on the inner side wall of the socket hole 200 to fix the bracket 4 in the socket hole 200 so that it will not rotate or move.

[0074] As Figures 8 - 9 shown, the bracket 4 further includes two mounting holes, namely a first mounting hole 43 and a second mounting hole 44, which penetrate through the side wall of the columnar frame body 41 respectively and communicate with the frame body through hole 42. The first clamping block 1 is fixed to the mounting hole 43 of the bracket 4, and the second clamping block 2 is movably installed on the mounting hole 44 of the bracket 4.

[0075] The first clamping block 1 and the second clamping block 2 are both V-shaped clamping blocks, which together with the through hole 42 of the frame body form a clamping hole 3. Specifically, the inner side wall of the through hole 42 of the frame body and the first clamping surface 13 and the second clamping surface 23 enclose the clamping hole 3, which is a hexagonal hole and is adapted to the shape of the object to be clamped 400 (such as a bolt or a nut). The inner diameter length of the clamping hole 3 where the object to be clamped can be effectively clamped is defined as the clamping width. In this embodiment, in the direction of the central axis (central symmetry axis) of the first clamping block 1 and the second clamping block 2, the distance between the first clamping block 1 and the second clamping block 2 is the clamping width of the clamping hole 3; in the direction of the central axis of the first clamping block 1 and the second clamping block 2, the aperture size of the clamping hole 3 is the clamping width of the clamping hole 3. Since the distance between the first clamping block 1 and the second clamping block 2 is adjustable, the aperture size of the clamping hole 3 is adjustable, and the clamping width of the clamping hole 3 is adjustable.

[0076] This embodiment further includes a clamping block installation groove 34, the cross section of which is crescent-shaped and is concave in the inner side wall of the sleeve hole 200, and the second clamping block 2 is movably installed in the clamping block installation groove 34. The second clamping block 2 includes two first positioning grooves 24 and two second elastic members 25. The first positioning groove 24 is concave in the surface of the second clamping block 2 facing the bottom of the clamping block installation groove 34; the second clamping surface 23 includes two planes, and the two first positioning grooves 24 respectively correspond to these two planes. The second elastic member 25 is preferably a helical spring and is arranged in a first positioning groove 24, one end of which is tangent to or connected to the bottom of the first positioning groove 24, and the other end of which is tangent to or connected to the bottom of the clamping block installation groove 34.

[0077] When the clamping device 300 is idle, the second elastic member 25 is in a relaxed state, and the clamping hole width of the clamping device 300 in the idle state is smaller than the width of the clamping hole 3 in its use state.

[0078] When the clamping device 300 is in use, the clamping hole 3 is sleeved outside the object to be clamped 400 (such as a bolt or a nut), and the gap between the wrench and the object to be clamped 400 can be eliminated. Under the combined action of the first clamping block 1, the second clamping block 2 and the bracket 4, the first clamping surface 13 and the second clamping surface 23 are attached to the outer surface of the object to be clamped 400 and clamp it, so that the clamping surfaces 13, 23 of the wrench are in good fit with the surface of the bolt or nut, effectively preventing slipping.

[0079] When the size of the object to be clamped (such as a bolt or a nut) is on the larger side, the two second elastic members 25 are compressed under force, and the second clamping block 2 moves towards the bottom surface of the clamping block mounting groove 34. There is a certain gap between the bracket 4 and both ends of the second clamping block 2. The larger the size of the object to be clamped, the greater the distance that the second clamping block 2 needs to move, and the greater the gap between both ends of the first clamping block 1 and both ends of the second clamping block 2 before rotation. In the extreme state, the second clamping block 2 can even be in close contact with the bottom surface of the clamping block mounting groove 34. When the object to be clamped 400 needs to be loosened or tightened, first, the lever body 100 rotates clockwise or counterclockwise along the thread direction, and the second clamping block 2 is driven to rotate by a small angle relative to the bracket 4. The gap between one end of the second clamping block 2 and the bracket 4 is eliminated, and the second clamping block 2 is in close contact with the bottom surface or side surface of the clamping block mounting groove 34. The first clamping block 1, the second clamping block 2, and the bracket 4 lock the object to be clamped 400. Then, the lever body 100 further rotates clockwise or counterclockwise along the thread direction, and the object to be clamped 400 (such as a bolt or a nut) can be loosened or tightened. During the loosening or tightening process, the object to be clamped 400 is always clamped and will not easily fall off, effectively improving work efficiency.

[0080] When the size of the object to be clamped (such as a bolt or a nut) is on the smaller side, the bracket 4 fits with both ends of the second clamping block 2, and the second clamping block 2 moves away from the bottom surface of the clamping block mounting groove 34. There is a large gap between the second clamping block 2 and the bottom of the clamping block mounting groove 34. The smaller the size of the object to be clamped, the greater the distance that the second clamping block 2 moves, and the greater the gap between the second clamping block 2 and the bottom of the clamping block mounting groove 34. When the object to be clamped 400 needs to be loosened or tightened, first, the lever body 100 rotates clockwise or counterclockwise along the thread, and the bracket 4 and the second clamping block 2 are driven to rotate by a small angle relative to the sleeve hole 200. The end faces at both ends of the first clamping block 1 and the end faces at both ends of the second clamping block 2 slide relative to each other, so that the second clamping block 2 abuts against the bottom surface or side surface of the clamping block mounting groove 34. The first clamping block 1, the second clamping block 2, and the bracket 4 lock the object to be clamped 400. The smaller the size of the object to be clamped, the greater the angle that the second clamping block 2 rotates relative to the sleeve hole 200. The lever body 100 further rotates clockwise or counterclockwise along the thread direction, and the object to be clamped 400 (such as a bolt or a nut) can be loosened or tightened. During the loosening or tightening process, the object to be clamped 400 is always clamped and will not easily fall off, effectively improving work efficiency.

[0081] Other technical features of this embodiment are the same as those of Embodiment 1 and will not be elaborated here.

[0082] In other embodiments similar to this embodiment, the clamping device 300 may further include more than three clamping blocks. The bracket 4 has at least one mounting hole that penetrates the side wall of the columnar frame body 41 and communicates with the frame body through-hole 42. One clamping block is installed in each mounting hole, wherein at least one clamping block is movably installed in the mounting hole of the bracket 4, and the other clamping blocks are fixed to the mounting holes. The inner side wall of the frame body through-hole 42 and the clamping surfaces of the plurality of clamping blocks enclose a clamping hole 3, and the distance between the plurality of clamping blocks is adjustable; the width of the clamping hole 3 in at least one direction is adjustable. When the wrench body 100 rotates preliminarily along the thread, the plurality of clamping blocks lock the object to be clamped 400; when the wrench body 100 rotates further along the thread direction, the object to be clamped 400 is tightened or loosened.

[0083] In other embodiments similar to this embodiment, the cross-section of the clamping hole 3 can be kidney-shaped, triangular, rectangular, hexagonal or octagonal, etc., corresponding to objects to be clamped (such as bolts or nuts) with different shapes and specifications respectively.

[0084] In other embodiments similar to this embodiment, like the second clamping block 2, the first clamping block 1 can also be movably installed in a clamping block mounting groove 34. In this way, both clamping blocks are movable, so that the distance between the two clamping blocks can be adjusted more greatly, and the width of the clamping hole can be adjusted.

[0085] The beneficial effect of this embodiment is to provide a wrench with two movable clamping blocks in its socket hole, so that the width of the clamping hole can be adjusted within a small range. When there is a small difference between the size of the object to be clamped and the clamping part, the inner diameter of its clamping hole can be automatically adjusted to eliminate the gap between the wrench and the bolt or nut, so that the clamping surface of the wrench fits well with the surface of the object to be clamped, effectively preventing slipping and enhancing the user's hand feeling. In addition, the present invention can fix the object to be clamped that has been loosened after being screwed on the clamping part and will not easily fall off, thereby effectively improving work efficiency and effectively preventing the object to be clamped (such as bolts or nuts) from being damaged.

[0086] Embodiment 3

[0087] As Figure 10 shown, most of the technical features of this embodiment are the same as those of Embodiment 1. The difference in technical features is that in Embodiment 3, the second clamping block 2 does not include two first positioning grooves 24 and two second elastic members 25, but includes a second positioning groove 26, a positioning ball 27 and a third elastic member 28. The second positioning groove 26 is recessed in the surface of the second clamping block 2 facing the first clamping block 1 (i.e., the second clamping surface 23). The positioning ball 27 is arranged at the notch of the second positioning groove 26, and the third elastic member 28 is arranged in the second positioning groove 26, with one end tangent to the bottom of the second positioning groove 26 and the other end connected to the positioning ball 27.

[0088] The clamping hole 3 is formed between two clamping blocks 1 and 2. Specifically, the clamping hole 3 is a hexagonal hole surrounded by a first clamping surface 13 and a second clamping surface 23, which is adapted to the shape of the object to be clamped 400 (such as a bolt or a nut). The inner diameter width of the clamping hole 3 where the object to be clamped 400 can be effectively clamped is defined as the clamping width. In this embodiment, in the direction of the central axes (central symmetry axes) of the first clamping block 1 and the second clamping block 2, the distance between the first clamping block 1 and the second clamping block 2 is the clamping width of the clamping hole 3; in the direction of the central axes of the first clamping block 1 and the second clamping block 2, the aperture size of the clamping hole 3 is the clamping width of the clamping hole 3. Since the distance between the first clamping block 1 and the second clamping block 2 is adjustable, the aperture size of the clamping hole 3 is adjustable, and the clamping width of the clamping hole 3 is adjustable.

[0089] Since the third elastic member 28 is disposed in the second positioning groove 26 and the positioning ball 27 is tangent to the surface of the object to be clamped 400, the position of the positioning ball 27 in the second positioning groove 26 is adjustable, and the position of the second clamping block 2 in the clamping block mounting groove 34 is adjustable.

[0090] When the clamping device 300 is idle, the third elastic member 28 is in a relaxed state, and a large part of the positioning ball 27 protrudes into the clamping hole 3.

[0091] When the clamping device 300 is in use, the clamping hole 3 is sleeved outside the object to be clamped 400 (such as a bolt or a nut). Under the elastic force of the third elastic member 28, the positioning ball 27 is tangent to the surface of the object to be clamped 400 (such as a bolt or a nut) or the object to be clamped 400 is clamped. The first clamping surface 13, the second clamping surface 23 and the positioning ball 27 are in contact with the outer surface of the object to be clamped 400 and clamp it, so that the clamping surfaces 13 and 23 of the wrench are in good contact with the surface of the bolt or the nut, effectively preventing slipping.

[0092] Similar to Embodiment 1, when the object to be clamped 400 needs to be loosened or tightened, the clamping hole 3 is sleeved outside the object to be clamped 400 (such as a bolt or a nut), the gap between the wrench and the object to be clamped 400 can be eliminated. Under the combined action of the first clamping block 1 and the second clamping block 2, the first clamping surface 13, the second clamping surface 23 and the surface of the positioning ball 27 are in contact with the outer surface of the object to be clamped 400 and clamp it, so that the clamping surfaces 13 and 23 of the wrench are in good contact with the surface of the bolt or the nut, effectively preventing slipping.

[0093] When the size of the object to be clamped (such as a bolt or nut) is on the larger side, the third elastic member 28 is compressed under force, and there is a certain gap between the two ends of the first clamping block 1 and the two ends of the second clamping block 2. After the third elastic member 28 is compressed, the second clamping block 2 moves towards the bottom surface of the clamping block installation groove 34. The larger the size of the object to be clamped, the larger the gap between the two ends of the first clamping block 1 and the two ends of the second clamping block 2 before rotation, and the greater the moving distance of the second clamping block 2 after rotation; in the extreme state, the second clamping block 2 can even be in close contact with the bottom surface of the clamping block installation groove 34. When the object to be clamped 400 needs to be loosened or tightened, first, the wrench body 100 rotates clockwise or counterclockwise along the thread direction, and the first clamping block 1 is driven to rotate by a small angle relative to the second clamping block 2, and the gap between the first clamping block 1 and the second clamping block 2 is eliminated; then, the wrench body 100 rotates further clockwise or counterclockwise along the thread direction, and the object to be clamped 400 (such as a bolt or nut) can be loosened or tightened. During the loosening or tightening process, the object to be clamped 400 is always clamped and will not easily fall off, which can effectively improve work efficiency.

[0094] When the size of the object to be clamped (such as a bolt or nut) is on the smaller side, the two ends of the first clamping block 1 are in contact with the two ends of the second clamping block 2, and there is a large gap between the second clamping block 2 and the bottom of the clamping block installation groove 34. When the object to be clamped 400 needs to be loosened or tightened, first, the wrench body 100 rotates clockwise or counterclockwise along the thread direction, and the first clamping block 1 and the second clamping block 2 are driven to rotate by a small angle relative to the sleeve hole 200, and the end faces at the two ends of the first clamping block 1 slide relative to the end faces at the two ends of the second clamping block 2. The second clamping block 2 abuts against the bottom surface or side surface of the clamping block installation groove 34, and the first clamping block 1, the second clamping block 2 and the positioning ball lock the object to be clamped 400. The smaller the size of the object to be clamped, the larger the gap between the second clamping block 2 and the bottom of the clamping block installation groove 34 before rotation, and the greater the angle of rotation of the second clamping block 2 relative to the sleeve hole 200 after rotation. Then, the wrench body 100 rotates further clockwise or counterclockwise along the thread direction, and the first clamping block 1, the second clamping block 2, the sleeve hole 200 and the object to be clamped 400 remain relatively fixed, and the object to be clamped 400 (such as a bolt or nut) can be loosened or tightened. During the loosening or tightening process, the object to be clamped 400 is always clamped and will not easily fall off, which can effectively improve work efficiency.

[0095] Other technical features of this embodiment are the same as those of Embodiment 1 and will not be elaborated here.

[0096] In other embodiments similar to this embodiment, the clamping device 300 may further include more than three clamping blocks, which are also installed in the sleeve hole 200; a clamping hole 3 is formed between the multiple clamping blocks, and at least one of the multiple clamping blocks is movably installed on the inner side wall of the sleeve hole 200. The clamping surfaces of one or more clamping blocks may be provided with a telescopic positioning device, including a positioning groove, a positioning ball and an elastic member, for fixing the object to be clamped 400. The distance between the multiple clamping blocks is adjustable; the width of the clamping hole 3 in at least one direction is adjustable. When the wrench body 100 rotates preliminarily along the thread, the multiple clamping blocks lock the object to be clamped 400; when the wrench body 100 rotates further along the thread, the object to be clamped 400 is tightened or loosened.

[0097] In other embodiments similar to this embodiment, the cross-section of the clamping hole 3 may be kidney-shaped, triangular, rectangular, hexagonal or octagonal, etc., corresponding to objects to be clamped 400 of different shapes and specifications (such as bolts or nuts).

[0098] The beneficial effect of this embodiment is to provide a wrench that uses a positioning device to fix the object to be clamped in the clamping hole. When there is a small difference between the size of the object to be clamped and the clamping part, the inner diameter of its clamping hole can be automatically adjusted. The present invention can fix the object to be clamped that has been loosened after being screwed on the clamping part and will not easily fall off, thereby effectively improving work efficiency and effectively preventing the object to be clamped (such as bolts or nuts) from being damaged.

[0099] Embodiment 4

[0100] As Figure 11 shown, this embodiment provides a wrench, including most of the technical features of Embodiment 1, such as the wrench body 100, the sleeve hole 200 and the clamping device 300. The distinguishing feature is that Embodiment 4 further includes a ratchet structure installed outside the clamping device 300; the clamping block installation groove 34 is recessed in the inner side wall of the ratchet ring 51, and the second clamping block 2 is movably installed in the clamping block installation groove 34; at the same time, this embodiment also includes a sleeve hole groove 35, whose cross-section is crescent-shaped and is recessed in the inner side wall of the sleeve hole 200.

[0101] The ratchet structure includes a ratchet ring 51, a ratchet pawl 52 and a fourth elastic member 53. The ratchet ring 51 is rotatably installed in the sleeve hole 200 and is sleeved outside the clamping device 300; the ratchet pawl 52 meshes with the ratchet ring 51; one end of the fourth elastic member 53 is connected to the wrench body 100, and the other end is connected to the ratchet pawl 52.

[0102] The ratchet ring 51 includes a driving portion 511 and a ring-shaped tooth 512. The driving portion 511 is disposed inside the ratchet ring 51 and fixed to the outside of the clamping device 300. The ring-shaped tooth 512 is disposed outside the ratchet ring 51. The clamping device 300 is fixed to or rotatably mounted inside the ratchet ring 51 and fixedly connected to the driving portion 511. After the object to be clamped 400 is placed in the clamping hole 3, the object to be clamped 400 is relatively fixed to the driving portion 511. The first clamping block 1 and the second clamping block 2 are movably mounted inside the ratchet ring 51, the distance between the first clamping block 1 and the second clamping block 2 is adjustable, and the aperture size of the clamping hole 3 is adjustable. Define the inner diameter width of the clamping hole 3 where the object to be clamped 400 can be effectively clamped as the clamping width, and the clamping width of the clamping hole 3 is adjustable. In this embodiment, the structures and working principles of the first clamping block 1 and the second clamping block 2 are the same as those in Embodiment 1 and will not be elaborated here.

[0103] The pawl 52 includes a ratchet block 521, ratchet teeth 522 and an elastic member mounting groove 523. The ratchet block 521 is disposed in a sleeve hole groove 35, and one side surface thereof is tangent to the side wall of the sleeve hole groove 35. The ratchet teeth 522 are disposed on the other side surface of the ratchet block 521 and mesh with the ring-shaped tooth 512. The elastic member mounting groove 523 is disposed on the bottom surface of the pawl 52 for mounting a fourth elastic member 53. One end of the fourth elastic member 53 is connected to the bottom or inner wall of the clamping block mounting groove 34, and the other end thereof is connected to the pawl 52.

[0104] In the operation of this embodiment, when the lever body 100 rotates clockwise, the ratchet ring 51, the pawl 52 and the lever body 100 are engaged together to form a relatively fixed whole. The second clamping block 2 slides in the clamping block mounting groove 34 on the ratchet ring 51 and clamps the object to be clamped 400 (such as a bolt or a nut) together with the first clamping block 1. When the lever body 100 rotates counterclockwise, the object to be clamped 400 drives the first clamping block 1 and the second clamping block 2 to rotate a certain angle, and then the second clamping block 2 abuts against the bottom surface and the side surface of the clamping block mounting groove 34, so that the ratchet structure forms a relatively fixed whole, enabling the lever body 100 to rotate back. The ratchet structure and the clamping device operate independently of each other without interference.

[0105] In other embodiments similar to this embodiment, the ratchet structure is also installed outside a clamping device 300, and the structure of the clamping device 300 may be the same as that of the clamping device 300 in Embodiment 2 or 3.

[0106] The beneficial effects of this embodiment are as follows. By combining the clamping device with adjustable width and the ratchet structure, a ratchet wrench capable of adjusting the width of the clamping hole is formed. When there are minor discrepancies between the dimensions of the object to be clamped and the clamping part, the inner diameter of its clamping hole can be automatically adjusted to eliminate the gap between the wrench and the bolt or nut, ensuring good fit between the clamping surface of the wrench and the surface of the object to be clamped, effectively preventing slippage, and enhancing the user's hand feeling. In addition, the present invention can fix the object to be clamped that has become loose after being screwed on the clamping part and prevent it from falling off easily, thereby effectively improving work efficiency and preventing damage to the object to be clamped (such as bolts or nuts).

[0107] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. A wrench, characterized in that, Comprising: A wrench body; A sleeve hole, recessed in one side surface of the wrench body or penetrating through the wrench body; A clamping device disposed within the sleeve hole; and A clamping hole disposed in the middle of the clamping device; the aperture size of the clamping hole is adjustable; The clamping device includes Two or more clamping blocks, oppositely arranged and enclosing the clamping hole; Wherein, the inner hole wall of the clamping hole includes the side walls of the two or more clamping blocks; The distance between the two or more clamping blocks is adjustable; The clamping device further includes A first groove recessed in the inner side wall of the sleeve hole; A second groove recessed in the outer side wall of one clamping block and oppositely arranged with the first groove; and A first elastic member snapped into the first groove and the second groove; Wherein, the shapes of the first groove, the second groove, and the first elastic member are a part of a ring; The cross-section of the clamping hole is kidney-shaped, triangular, rectangular, hexagonal or octagonal.

2. The wrench according to claim 1, characterized in that, One clamping block includes A clamping block body, which is a part of a cylinder; A clamping opening penetrating through the top and bottom of the clamping block body, and the opening direction thereof faces another clamping block; And A clamping surface, which is the inner side wall of the clamping opening.

3. The wrench according to claim 1, characterized in that, It further includes A clamping block mounting groove recessed in the inner side wall of the sleeve hole, and at least one clamping block is mounted to the clamping block mounting groove.

4. The wrench according to claim 1, wherein The clamping device further includes A bracket mounted within the sleeve hole; at least one clamping block is movably mounted to the bracket.

5. The wrench according to claim 4, wherein The bracket includes A columnar frame body snapped into the sleeve hole; A frame body through-hole penetrating through the top and bottom of the columnar frame body; and Two or more mounting holes respectively penetrating through the side wall of the columnar frame body and communicating with the frame body through-hole; wherein, one clamping block is movably or fixedly mounted in each mounting hole, and the inner side wall of the frame body through-hole and the clamping surfaces of the two or more clamping blocks enclose the clamping hole.

6. The wrench according to claim 5, wherein The outer side wall of the columnar frame body is tangent to the inner side wall of the sleeve hole; Flanges protruding are respectively provided at the top and bottom of the outer side wall of the columnar frame body; The two flanges are snapped onto the surfaces on both sides of the wrench body.

7. The wrench according to claim 1, characterized in that, It further includes A ratchet ring rotatably mounted within the sleeve hole and sleeved outside the clamping device.

8. The wrench according to claim 7, wherein The clamping device further includes A first groove recessed in the inner side wall of the ratchet ring; A second groove recessed in the outer side wall of one clamping block and oppositely arranged with the first groove; And A first elastic member snapped into the first groove and the second groove; Wherein, the shapes of the first groove, the second groove, and the first elastic member are a part of a ring.

9. The wrench according to claim 7, characterized in that, It further includes A clamping block mounting groove recessed in the inner side wall of the ratchet ring, and at least one clamping block is mounted to the clamping block mounting groove.

10. The wrench according to claim 3 or 9, wherein At least one clamping block is movably mounted within the clamping block mounting groove; the clamping block includes A first positioning groove recessed in the surface of the clamping block facing the bottom of the clamping block mounting groove; And The second elastic member is disposed within the first positioning groove, one end thereof being tangent to the bottom of the first positioning groove, and the other end thereof being tangent to the bottom of the clamping block mounting groove.

11. The wrench according to claim 3 or 9, wherein at least one clamping block is mounted within the clamping block mounting groove; the clamping block includes a second positioning groove that is recessed from a surface of the clamping block facing another clamping block; a positioning ball disposed at an orifice of the second positioning groove, and a third elastic member disposed within the second positioning groove, one end thereof being tangent to or connected to the bottom of the second positioning groove, and the other end thereof being connected to the positioning ball; a part of a surface of the positioning ball and clamping surfaces of two or more clamping blocks define the clamping hole.

12. The wrench according to claim 7, wherein the clamping device further includes a bracket mounted within the ratchet ring; at least one clamping block is movably mounted to the bracket.

13. The wrench according to claim 12, wherein the bracket includes a columnar frame body that is engaged with an inner side of the ratchet ring; a frame body through hole that penetrates through a top and a bottom of the columnar frame body; and two or more mounting holes respectively penetrating through a side wall of the columnar frame body and communicating with the frame body through hole; wherein, each mounting hole has a clamping block movably or fixedly mounted therein, and an inner side wall of the frame body through hole and clamping surfaces of two or more clamping blocks define the clamping hole.

14. The wrench according to claim 13, wherein an outer side wall of the columnar frame body is tangent to an inner side wall of the ratchet ring; a flange protruding respectively from a top end and a bottom end of the outer side wall of the columnar frame body; the two flanges are engaged with surfaces on two sides of the ratchet ring.

15. The wrench according to claim 7, characterized in that, It further includes a socket groove that is recessed from an inner side wall of the socket; a pawl disposed within the socket groove and engaged with the ratchet ring; and a fourth elastic member disposed within the socket groove, one end thereof being connected to a bottom or an inner wall of the socket groove, and the other end thereof being connected to the pawl.

16. The wrench according to claim 15, wherein the ratchet ring includes a driving portion disposed within the ratchet ring and fixed to an outer side of the clamping device; and a ring-shaped tooth disposed on an outer side of the ratchet ring; the pawl includes a ratchet tooth block, one side surface thereof being tangent to a side wall of the socket groove; ratchet teeth disposed on another side surface of the ratchet tooth block and engaged with the ring-shaped teeth; and an elastic member mounting groove disposed on a bottom surface of the pawl for mounting the fourth elastic member; wherein, one end of the fourth elastic member is connected to a bottom or an inner wall of the socket groove, and the other end thereof is connected to the pawl.

17. The wrench according to claim 4 or 12, wherein The material of the bracket is hard plastic.

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