Chain wrench

Abstract

The utility model relates to a chain wrench, a mounting part of the chain wrench is provided with a preset section, the mounting part is provided with a preset graph on the preset section, a fixed end of a chain is provided with a first projection graph on the preset section, and a holding part is provided with a second projection graph on the preset section. A first connecting line is arranged between the geometric center of the first projection graph and the geometric center of the preset graph, a second connecting line is arranged between the geometric center of the second projection graph and the geometric center of the preset graph, and an included angle of 60-120 degrees is formed between the first connecting line and the second connecting line. According to the fastening device, the mounting part and the holding part are arranged in a staggered mode, so that the rotating plane of the chain and the rotating plane of the holding part are kept parallel but do not coincide, and when a shielding object is arranged on the peripheral face of the to-be-fastened part, the mounting part and the chain can avoid the shielding object and are matched with the to-be-fastened part; compared with a wrench in the related technology, it can be guaranteed that the chain and the to-be-fastened part have the enough attaching area, the chain is prevented from slipping relative to the to-be-fastened part, and the use experience is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mechanical wrenches, and in particular to a chain wrench. Background Art

[0002] A wrench is a tool used to loosen or tighten pipes, round rods, nuts and other fastening parts.

[0003] In the related art, the shape of the clamping structure of the wrench is fixed, so it is necessary to carry a matching wrench according to the shape of the part to be fastened for operation, and when operating on round parts or special-shaped parts, the wrench and the part to be fastened may not fit tightly, causing damage to the part to be fastened and increasing the difficulty of disassembly and tightening. Utility Model Content

[0004] In order to solve the problems existing in the related art, the present disclosure provides a chain wrench, including:

[0005] Grip part;

[0006] A mounting portion, which is cylindrical and disposed on a side wall of the grip portion;

[0007] A chain having a fixed end and a free end, wherein the fixed end is connected to the outer wall of the mounting portion, the chain is curved, and the free end passes through the mounting portion along the extension direction of the mounting portion;

[0008] In which, the mounting portion has a preset cross-section, the preset cross-section is perpendicular to the extension direction of the mounting portion, the mounting portion has a preset pattern at the preset cross-section, the fixed end has a first projection pattern on the preset cross-section, the holding portion has a second projection pattern on the preset cross-section, a first connecting line is formed between the geometric center of the first projection pattern and the geometric center of the preset pattern, a second connecting line is formed between the geometric center of the second projection pattern and the geometric center of the preset pattern, and an angle of 60° to 120° is formed between the first connecting line and the second connecting line.

[0009] In some embodiments, the angle between the first connecting line and the second connecting line is 90°.

[0010] In some embodiments, two mounting portions are provided, the two mounting portions are provided at the same end of the holding portion, and the holding portion is located between the two mounting portions.

[0011] In some embodiments, each of the mounting portions is connected to the fixed end of the chain, and the two fixed ends are located on opposite sides of the mounting portion.

[0012] In some embodiments, a groove is provided on the outer side of the curved chain, and the wall thickness of the mounting portion is less than or equal to the width of the groove;

[0013] During use, the end of the mounting portion extends into the groove.

[0014] In some embodiments, the chain includes a plurality of chain links connected in sequence, the chain links having a first arcuate surface, and the center of the first arcuate surface is located outside the chain links;

[0015] The groove is arranged on the first arc surface.

[0016] In some embodiments, the chain link has a second arcuate surface, and the center of the second arcuate surface is located inside the chain link;

[0017] The second arc-shaped surface has a rough surface.

[0018] In some embodiments, the gripping portion is cylindrical.

[0019] In some embodiments, in the extension direction of the mounting portion, the length of the mounting portion is 10% to 30% of the length of the gripping portion.

[0020] In some embodiments, the radial cross-sections of the mounting portion and the holding portion are the same.

[0021] The beneficial effects of the present disclosure are: the mounting portion and the holding portion are staggered so that the rotation plane of the chain remains parallel to but does not overlap with the rotation plane of the holding portion; when there is an obstruction on the outer peripheral surface of the component to be fastened, the mounting portion and the chain can avoid the obstruction and cooperate with the component to be fastened; compared with the wrench in the related art, it can ensure that the chain and the component to be fastened have sufficient fitting area, avoid the chain from slipping relative to the component to be fastened, and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 is a structural diagram of a chain wrench provided by an embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of a chain wrench provided by an embodiment of the present disclosure;

[0025] Figure 3 yes Figure 1 Preset cross-section diagram of AA in the middle;

[0026] Figure 4 yes Figure 1 A preset cross-sectional view of AA of another example;

[0027] Figure 5 is a schematic diagram of a chain provided by an example of the present disclosure;

[0028] Figure 6 It is a partial schematic diagram of a chain wrench provided in an embodiment of the present disclosure.

[0029] Description of the drawings: 1. Grip; 11. Second projection pattern; 2. Mounting portion; 21. Preset pattern; 3. Chain; 31. Fixed end; 311. First projection pattern; 32. Free end; 33. Chain link; 331. First arcuate surface; 332. Second arcuate surface; 34. Fixing member; 4. Groove; 5. First connecting line; 6. Second connecting line; 7. Component; AA, preset section. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that, in the absence of conflict, the embodiments in this disclosure and the feature vectors in the embodiments can be arbitrarily combined with each other.

[0031] In the related art, the shape of the clamping structure of the wrench is fixed, so it is necessary to carry a matching wrench according to the shape of the part to be fastened for operation, and when operating on round parts or special-shaped parts, the wrench and the part to be fastened may not fit tightly, causing damage to the part to be fastened and increasing the difficulty of disassembly and tightening.

[0032] In order to solve the problems existing in the related art, an embodiment of the present invention provides a chain wrench, which includes a gripping portion, a mounting portion and a chain, wherein the mounting portion is cylindrical and is arranged on the side wall of the gripping portion, the chain has a fixed end and a free end, the fixed end is connected to the outer wall of the mounting portion, the chain is curved, and the free end passes through the mounting portion along the extension direction of the mounting portion, the mounting portion has a preset cross-section, the preset cross-section is perpendicular to the extension direction of the mounting portion, the mounting portion has a preset figure at the preset cross-section, the fixed end has a first projection figure on the preset cross-section, the gripping portion has a second projection figure on the preset cross-section, a first connecting line is provided between the geometric center of the first projection figure and the geometric center of the preset figure, a second connecting line is provided between the geometric center of the second projection figure and the geometric center of the preset figure, and an angle of 60° to 120° is provided between the first connecting line and the second connecting line.

[0033] In the present disclosure, the mounting portion and the holding portion are staggered so that the rotation plane of the chain remains parallel to but does not overlap with the rotation plane of the holding portion. When there is an obstruction on the outer peripheral surface of the component to be fastened, the mounting portion and the chain can avoid the obstruction and cooperate with the component to be fastened. Compared with the wrench in the related art, it can ensure that the chain and the component to be fastened have sufficient fitting area, avoid the chain from slipping relative to the component to be fastened, and improve the user experience.

[0034] In order to make the purpose, technical solution and beneficial effects of the embodiments of the present disclosure more clear, a chain wrench provided by the embodiments of the present disclosure is described in detail below with reference to the accompanying drawings.

[0035] According to the disclosed exemplary embodiments, Figures 1 to 6 As shown, the chain wrench includes a grip portion 1, a mounting portion 2 and a chain 3. The mounting portion 2 is arranged on the side wall of the grip portion 1, for example, it can be arranged at the end of the grip portion 1. Figure 1 The end of the gripping portion 1 away from the mounting portion 2 is used for the user to hold. The mounting portion 2 is a hollow cylindrical structure so that the chain 3 can pass through to form an annular clamping structure.

[0036] like Figure 1 and Figure 2 As shown, the chain 3 of the chain wrench has a fixed end 31 and a free end 32, and the fixed end 31 is connected to the outer wall of the mounting portion 2, and the connection method can be welding, threaded connection, etc. In one example, Figure 1 and Figure 2 As shown, the fixed end 31 of the chain 3 is connected to the mounting portion 2 by welding. The chain 3 is curved. The chain 3 can directly clamp the complex and large component 7 and disassemble or tighten it. The chain 3 can also wrap the free end 32 around the component 7 so that the chain 3 surrounds a space for accommodating the component 7. Then the free end 32 is extended along the extension direction of the mounting portion 2 (such as Figure 2The chain 3 is passed through the mounting portion 2 in the z direction as shown in the figure, so that the fixed end 31 and the free end 32 of the chain 3 are in close contact with the component 7, and the component 7 is tightened or removed. The component 7 can be a pipe fitting, a pin sleeve, a nut, etc., and the shape of the component 7 can be circular or polygonal.

[0037] It should be noted that the accommodating space enclosed by the chain 3 can also be in the shape of a circle, rectangle, triangle, etc. This does not limit the technical solution disclosed in the present invention. The chain 3 can be adaptively enclosed into a desired shape according to the actual shape requirements of the component 7 to adapt to the shape structure of different components 7.

[0038] like Figures 1 to 4 As shown, the mounting portion 2 has a preset cross section AA, and the preset cross section AA is parallel to the extension direction of the mounting portion 2 (eg Figure 2 The mounting portion 2 has a preset pattern 21 at the preset cross section AA, the fixing end 31 has a first projection pattern 311 on the preset cross section AA, and the grip portion 1 has a second projection pattern 11 on the preset cross section AA. Figure 3 and Figure 4 As shown in , on the preset section AA, the preset figure 21 and the second projection figure 11 are both in annular structures, the first projection figure 311 is in an I-shaped structure, there is a first connecting line 5 between the geometric center of the first projection figure 311 and the geometric center of the preset figure 21, there is a second connecting line 6 between the geometric center of the second projection figure 11 and the geometric center of the preset figure 21, and there is an angle of 60° to 120° between the first connecting line 5 and the second connecting line 6. In the process of using the chain wrench, by limiting the angle between the first connecting line 5 and the second connecting line 6, when the chain 3 is wound around the component 7 for tightening or disassembly, the grip 1 and the chain 3 are located in the same horizontal plane, so that the component 7 is prevented from being blocked by the external structure, thereby avoiding the displacement of force, and thus improving the efficiency of disassembly and tightening of the component 7.

[0039] In the present disclosure, the mounting portion and the gripping portion are staggered so that the rotation plane of the chain and the rotation plane of the gripping portion remain parallel but not overlapped. When there is an obstruction on the outer peripheral surface of the part to be fastened, the mounting portion and the chain can avoid the obstruction and cooperate with the part to be fastened. Compared with the wrench in the related art, it can ensure that the chain and the part to be fastened have a sufficient fitting area, avoid the chain from slipping relative to the part to be fastened, and improve the use experience. The chain wrench has a simple structure and a small size. During the use of the chain wrench, the part to be fastened can be disassembled and tightened in a small space. It can be adapted to parts to be fastened of different sizes, and can reduce the loss of the part to be fastened and the difficulty of tightening and disassembling, thereby improving work efficiency and saving the operator's installation or disassembly time.

[0040] In one example, continue to refer to Figure 3The first projection pattern 311 is located on one side of the preset pattern 21 of the mounting portion 2, and the angle between the first connecting line 5 and the second connecting line 6 is 90°, which makes the operation space of the chain wrench larger, and thus the operation is more convenient and labor-saving. When using the chain wrench, the chain 3 surrounds the outside of the component 7, so that the outside of the component 7 can be stressed, thereby ensuring that the force of the component 7 is uniform. At the same time, the chain 3 is in abutment with the mounting portion 2, which makes it easier for the chain wrench to tighten and disassemble the component 7.

[0041] In another example, if Figure 4 As shown, the first projection figure 311 is located on one side of the preset figure 21 of the mounting portion 2, and the angle between the first connecting line 5 and the second connecting line 6 is 120°. When encountering an inclined component 7, it is convenient for the chain wrench to be wrapped around the component 7, so that the outer side of the component 7 can be subjected to force, thereby ensuring that the force on the component 7 is uniform. At the same time, the chain 3 is abutted against the mounting portion 2, which makes it easier for the chain wrench to tighten and disassemble the component 7.

[0042] In some embodiments, Figure 1 As shown in the figure, two mounting parts 2 are provided, and the two mounting parts 2 are provided at the same end of the gripping part 1, and the gripping part 1 is located between the two mounting parts 2. The two mounting parts 2 are connected to the gripping part 1, and the connection method can be welding, detachable connection, etc. The lengths of the two mounting parts 2 can be set to be the same or different as required. In one example, the two mounting parts 2 are welded to the gripping part 1, and in the extension direction of the gripping part 1 (such as Figure 1 In the z direction shown in FIG, the two mounting parts 2 are symmetrically arranged, and the lengths of the two mounting parts 2 are the same. During use, when encountering a complex and large component 7, the two chains 3 can be simultaneously wound around the outside of the component 7, so that the force can be concentrated on the two chains 3, and then the component 7 can be tightened and disassembled.

[0043] In some embodiments, Figures 1 to 4 As shown, each mounting portion 2 is connected to the fixed end 31 of the chain 3, and the positions of the two fixed ends 31 can be adaptively set as needed. In one example, each mounting portion 2 can be connected to the fixed end 31 of each chain 3 by welding. Figure 1 In the y direction shown in FIG, the two fixing ends 31 are located on the opposite sides of the mounting portion 2, as shown in FIG. Figure 3 As shown, one fixing end 31 is located on the left side of one mounting portion 2 , and the other fixing end 31 is located on the right side of the other mounting portion 2 .

[0044] In some embodiments, Figure 5 and Figure 6As shown, a groove 4 is provided on the outer side of the curved chain 3, and a plurality of grooves 4 are provided. The plurality of grooves 4 are arranged at intervals along the outer edge of the curved chain 3, and the wall thickness of the mounting portion 2 is less than or equal to the width of the groove 4. When using the chain wrench, after the chain 3 is sleeved on the component 7, the chain 3 is fixed according to the size of the outer periphery of the component 7 so that the end of the mounting portion 2 extends into the groove 4 of the chain 3 of the required limited size, thereby fixing the chain 3 and tightening or disassembling the component 7 to avoid slipping during the use of the chain wrench.

[0045] In some embodiments, continue to refer to Figure 5 and Figure 6 The chain 3 includes a plurality of chain links 33 connected in sequence. The connection method may be a pin connection or a hinge connection. As long as the plurality of chain links 33 can be connected, there is no excessive restriction in the present disclosure. The chain link 33 has a first arcuate surface 331. In one example, Figure 1 and Figure 6 As shown, each link 33 has a first arcuate surface 331, the first arcuate surface 3331 is away from the outside of the component 7, the center of the first arcuate surface 331 is located outside the link 33, a plurality of grooves 4 are arranged on the first arcuate surface 331, and the plurality of grooves 4 are arranged at intervals along the arc edge of the first arcuate surface 331, and the grooves 4 on the first arcuate surface 331 are used to clamp the end of the mounting portion 2.

[0046] In another example, if Figure 5 As shown, each link 33 has two first arcuate surfaces 331, the two first arcuate surfaces 331 are arranged opposite to each other, and the centers of the two first arcuate surfaces 331 are both located outside the link 33, and multiple grooves 4 are arranged on the first arcuate surfaces 331, wherein the grooves 4 on one side of the first arcuate surface 331 are used to clamp the end of the mounting portion 2, and the grooves 4 on the other first arcuate surface 331 are used to contact with the component 7 to increase the friction force.

[0047] In some embodiments, continue to refer to Figure 5 and Figure 6 The chain link 33 has a second arc surface 332, and the second arc surface 332 is located on both sides of the two first arc surfaces 331. The center of the second arc surface 332 is located in the chain link 33, and the second arc surface 332 has a through hole. Multiple chain links 33 are inserted into the through hole through a fixing member 34 (such as a bolt) to be connected to each other, so that the multiple chain links 33 can rotate relatively along the fixing member 34, thereby adjusting the shape of the chain 3. The second arc surface 332 has a rough surface. During the use of the chain wrench, it can increase the friction between the chain 3 and the component 7 to avoid slipping when tightening and disassembling the component 7, thereby affecting the work efficiency.

[0048] In some embodiments, Figure 1 and Figure 2 As shown, the shape of the grip portion 1 can be adaptively set as needed. In one example, continue to refer to Figure 1 and Figure 2 The shape of the gripping portion 1 can be the same as that of the mounting portion 2. The gripping portion 1 is cylindrical. The cylindrical gripping portion 1 increases the comfort of the operator's grip during use, and can well disperse and bear pressure, making it easy to use and labor-saving. In another example (not shown in the drawings), the gripping portion also has internal expansibility. For chains that need to carry different lengths and sizes, that is, a rod-shaped structure that can be inserted is provided in the gripping portion. By adjusting the length or diameter of the rod-shaped structure, it is convenient for the operator to hold it, so as to increase the force arm, so that it can be relatively easy to adjust and meet different operating requirements.

[0049] In some embodiments, Figure 1 As shown, in the extension direction of the mounting portion 2 (such as Figure 1 In the z direction shown in FIG, the length of the mounting portion 2 is 10% to 30% of the length of the gripping portion 1. In one example, the mounting portion 2 and the gripping portion 1 can be provided by cylindrical structures of different lengths, wherein in the axial direction of the gripping portion 1 (as shown in FIG, Figure 1 In the z direction shown in FIG, the length dimension of the gripping portion 1 is 25 cm, and the length dimension of the mounting portion 2 is 5 cm.

[0050] In some embodiments, Figure 3 and Figure 4 As shown, in the radial direction of the mounting portion 2 (such as Figure 3 In the y direction shown in FIG, the radial cross-sections of the mounting portion 2 and the gripping portion 1 are the same. In one example, the mounting portion 2 and the gripping portion 1 can be cut from a whole section of pipe material, and a whole pipe material is cut into pipes of different lengths, that is, cut into long pipes and short pipes, and the short pipes are welded to the long pipes, so that the short pipes constitute the mounting portion 2 and the long pipes constitute the gripping portion 1, thereby forming a partial structure of the chain wrench, and the manufacturing method is simple, and the process and raw materials are reasonably utilized, providing convenience for operators.

[0051] The working principle of a chain wrench disclosed in the present invention is:

[0052] like Figures 1 to 6 As shown, first, the free end 32 of a chain 3 is wrapped around the outside of the component 7, so that the chain 3 is evenly placed on the periphery of the component 7 and wraps the outside of the component 7. When performing complex tightening and disassembly of the component 7, the free ends 32 of two chains 3 can be used simultaneously to wrap around the outside of the component 7.

[0053] Next, the free end 32 of the chain 3 is moved along the extension direction of the mounting portion 2 (eg Figure 1The chain 3 passes through the mounting portion 2 (in the z direction as shown in the figure), and is hinged by a plurality of chain links 33. The first curved surface 331 of the chain link 3 is clamped to the end of the mounting portion 2 according to the size of the component 7, so that the chain 3 encloses a space that only accommodates the component 7. The operator holds the gripping portion 1 and applies a directional force to the chain 3 in a desired direction, so that the chain 3 fits tightly against the outside of the component 7, and the second curved surface 332 of the chain 3 contacts the component 7, and the second curved surface 332 has a rough surface, which can increase the contact friction between the chain 3 and the component 7 and avoid slipping when tightening and removing the component 7.

[0054] Finally, the chain 3 drives the component 7 to rotate, so that the component 7 can be disassembled and tightened. After the chain wrench is used, the free end 32 of the chain 3 is taken out from the mounting portion 2, so that the chain 3 is in a straight line shape and close to the gripping portion 1 for easy storage, thereby saving the space occupied by the chain wrench.

[0055] In the present disclosure, the mounting portion and the holding portion are staggered so that the rotation plane of the chain remains parallel to but does not overlap with the rotation plane of the holding portion. When there is an obstruction on the outer peripheral surface of the component to be fastened, the mounting portion and the chain can avoid the obstruction and cooperate with the component to be fastened. Compared with the wrench in the related art, it can ensure that the chain and the component to be fastened have sufficient fitting area, avoid the chain from slipping relative to the component to be fastened, improve the user experience, and can disassemble and tighten the components in a small space. The chain wrench can adapt to components to be fastened of different sizes, thereby reducing the loss of the components to be fastened and the difficulty of tightening and disassembly.

[0056] In the description of the present disclosure, it is necessary to understand that the terms "left", "right", "up", "down", "vertical", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure 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, and therefore should not be understood as a limitation on the present disclosure.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present disclosure, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A chain wrench, characterized in that: include: Grip part; A mounting portion, which is cylindrical and disposed on a side wall of the grip portion; A chain having a fixed end and a free end, wherein the fixed end is connected to the outer wall of the mounting portion, the chain is curved, and the free end passes through the mounting portion along the extension direction of the mounting portion; In which, the mounting portion has a preset cross-section, the preset cross-section is perpendicular to the extension direction of the mounting portion, the mounting portion has a preset pattern at the preset cross-section, the fixed end has a first projection pattern on the preset cross-section, the holding portion has a second projection pattern on the preset cross-section, a first connecting line is formed between the geometric center of the first projection pattern and the geometric center of the preset pattern, a second connecting line is formed between the geometric center of the second projection pattern and the geometric center of the preset pattern, and an angle of 60° to 120° is formed between the first connecting line and the second connecting line.

2. The chain wrench according to claim 1, characterized in that: The angle between the first connecting line and the second connecting line is 90°.

3. The chain wrench according to claim 1, characterized in that: The two mounting parts are provided, the two mounting parts are provided at the same end of the holding part, and the holding part is located between the two mounting parts.

4. The chain wrench according to claim 3, characterized in that: Each of the mounting portions is connected to the fixed end of the chain, and the two fixed ends are located on different sides of the mounting portion.

5. The chain wrench according to claim 1, characterized in that: A groove is provided on the outer side of the curved chain, and the wall thickness of the mounting portion is less than or equal to the width of the groove; During use, the end of the mounting portion extends into the groove.

6. The chain wrench according to claim 5, characterized in that: The chain comprises a plurality of chain links connected in sequence, wherein the chain links have a first arcuate surface, and the center of the first arcuate surface is located outside the chain links; The groove is arranged on the first arc surface.

7. The chain wrench according to claim 6, characterized in that: The chain link has a second arcuate surface, and the center of the second arcuate surface is located inside the chain link; The second arc-shaped surface has a rough surface.

8. The chain wrench according to claim 1, characterized in that: The gripping portion is in a cylindrical shape.

9. The chain wrench according to claim 8, characterized in that: In the extending direction of the mounting portion, the length of the mounting portion is 10% to 30% of the length of the gripping portion.

10. The chain wrench according to claim 8, characterized in that: The radial cross-sections of the mounting portion and the holding portion are the same.

Images