Rotary anti-clamping wrench

Abstract

The utility model relates to a rotary anti-clamping wrench which is used for solving the technical problems that an existing rotary wrench is prone to being clamped and disengaged from a nut in the rotating process. Comprising a wrench body, a long gripper arm and a short gripper arm are arranged at the front end of the wrench body, a jaw used for clamping a nut is defined between the long gripper arm and the short gripper arm, the inner wall of the jaw is composed of a first plane, a second plane, a first cambered surface and a third plane which are sequentially connected in the direction from the short gripper arm to the long gripper arm, and the included angle between the first plane and the second plane is 120 degrees. The first plane is shorter than the second plane, a lubricating layer is arranged on the first cambered surface to reduce friction force between the nut and the first cambered surface, and the unfolding length of the first cambered surface is larger than the length of the second plane.

Description

Technical Field

[0001] This utility model relates to a rotary anti-jamming wrench. Background Technology

[0002] As a common tool, wrenches are widely used. However, traditional wrenches have the following problems when used: when tightening nuts, due to the limited space, the jaws cannot rotate a full circle after being locked onto the nut. It is necessary to rotate the nut at one angle, remove the jaws, and then lock them onto the nut again from another angle. Due to the limited space, it is very difficult to repeatedly lock the jaws onto the nut, which greatly affects work efficiency.

[0003] Therefore, some rotary open-end wrenches exist on the market, which can solve the problem of repeatedly getting the jaws stuck on the nut to some extent. However, in actual use, when the rotary open-end wrenches on the market are rotated to a certain angle and then turned back to their original position, there is significant friction or even jamming between the inner wall of the jaws and the edges of the nut. This causes the wrench to fail to return to its original position smoothly, or even to detach from the nut during the return process, forcing the jaws to be repeatedly stuck on the nut. Utility Model Content

[0004] The purpose of this utility model is to provide a rotary anti-jamming wrench to solve the technical problems of existing rotary wrenches being prone to jamming and detaching from the nut during rotation.

[0005] The technical solution of this utility model is as follows: A rotary anti-jamming wrench includes a wrench body. The front end of the wrench body has a long jaw and a short jaw. The long jaw and the short jaw form a jaw for clamping a nut. The inner wall of the jaw is composed of a first plane, a second plane, a first arc surface, and a third plane connected sequentially from the short jaw to the long jaw. The angle between the first plane and the second plane is 120°. The length of the first plane is less than the length of the second plane. A lubricating layer is provided at the first arc surface to reduce the friction between the nut and the first arc surface. The unfolded length of the first arc surface is greater than the length of the second plane.

[0006] The beneficial effects of this solution are as follows: When using the rotary anti-jamming wrench of this utility model, the first plane located at the short jaw and the third plane located at the long jaw respectively engage with one opposite side of the nut. That is, the first plane and the third plane are the main force-applying parts of the wrench, which can tighten the nut. After tightening to a certain angle, the wrench can be rotated in the opposite direction. Because the first arc surface avoids one corner of the nut, the jaws will not obstruct the rotation of the wrench. Moreover, because the first arc surface is provided with a lubricating layer, it can pass through the nut very smoothly even when it comes into contact with it, avoiding excessive friction on the first arc surface that would hinder the smooth return of the wrench. That is, the lubricating layer reduces the friction that the first arc surface brings to the nut, so the curvature of the first arc surface can be made smaller, thereby making the wrench stronger.

[0007] Furthermore, a groove is provided at the first arc surface, and the lubricating layer is a graphite sheet made of graphite material, which is embedded in the groove. The design of embedding graphite sheets allows the lubricating layer to be replaced, thereby extending the life of the wrench by maintaining good lubrication.

[0008] Furthermore, the lubricating layer is a solid lubricating coating applied to the first arc surface.

[0009] Furthermore, a concave second arc surface is provided on the second plane near the first plane, and the unfolded length of the second arc surface is less than that of the first arc surface. This design of providing a concave second arc surface on the second plane at the contact point between the first and second planes allows the wrench to avoid the other corner of the nut when rotating, preventing the wrench jaws from moving away from the nut due to contact with the second plane. This prevents the wrench jaws from detaching from the nut, thus achieving the purpose of tightening the nut completely in one pass. Attached Figure Description

[0010] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the rotary anti-jamming wrench of this utility model;

[0011] Figure 2 for Figure 1 A sectional view;

[0012] Figure 3 for Figure 1 A diagram illustrating the state of the nut during tightening;

[0013] Figure 4 This is a schematic diagram showing the state of the wrench when it begins to rotate in the reverse direction.

[0014] Figure 5 This diagram illustrates the state of the nut being tightened after the wrench has been turned in the reverse direction to the correct position.

[0015] Figure 6 This is a schematic diagram of the state when tightening the nut in Embodiment 2 of the rotary anti-jamming wrench;

[0016] Figure 7 for Figure 6 A diagram showing the state of the corresponding wrench when it begins to rotate in the reverse direction;

[0017] In the diagram: 1-wrench body, 11-long jaws, 12-short jaws, 13-jaws, 131-first plane, 132-second plane, 133-first arc surface, 134-third plane, 135-second arc surface, 136-lubricating layer, 2-nut. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0021] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0022] Embodiment 1 of the rotary anti-jamming wrench of this utility model: Figure 1-5As shown, the wrench in this embodiment is an open-end wrench. The rotary anti-jamming wrench includes a wrench body 1, which includes a handle. The front end of the wrench body 1 has a long jaw 11 and a short jaw 12. The length of the long jaw 11 is greater than that of the short jaw 12. The long jaw 11, the short jaw 12, and the wrench body 1 together form a jaw 13 for engaging the nut 2. The inner wall of the jaw 13 is composed of a first plane 131, a second plane 132, a first arc surface 133, and a third plane 134 connected sequentially from the short jaw 12 to the long jaw 11. The angle between the first plane 131 and the second plane 132 is 120°. The length of the first plane 131 is less than that of the second plane 132. A lubricating layer 136 is provided at the first arc surface 133 to reduce the friction between the nut 2 and the first arc surface 133. The unfolded length of the first arc surface 133 is greater than that of the second plane 132. Figure 1-2 As shown, a groove is provided at the first arc surface 133, and the lubrication layer 136 is a graphite sheet made of graphite material, which is embedded in the groove. The design of embedding graphite sheets makes the lubrication layer 136 replaceable, thereby extending the life of the wrench by maintaining good lubrication.

[0023] In use, the rotary anti-jamming wrench of this utility model utilizes the first plane 131 located at the short jaw 12 and the third plane 134 located at the long jaw 11 to engage with opposite sides of the nut 2. The first plane 131 and the third plane 134 are the main force-applying parts of the wrench, enabling the tightening of the nut 2. After tightening to a certain angle, the wrench can be rotated in the opposite direction. Because the first arc surface 133 avoids one corner of the nut 2, the jaws 13 do not obstruct the rotation of the wrench. Furthermore, the lubricating layer 136 on the first arc surface 133 allows for smooth passage even when it contacts the nut 2, preventing excessive friction from hindering the smooth return of the wrench. The lubricating layer 136 reduces the friction exerted by the first arc surface 133 on the nut 2, allowing for a smaller arc and thus increasing the wrench's strength.

[0024] In other embodiments, the lubricating layer 136 is a solid lubricating coating applied to the first arcuate surface 133.

[0025] Embodiment 2 of the present invention: As shown in the figure. Figure 6-7As shown, a concave second arc surface 135 is provided on the second plane 132 on the side closest to the first plane 131. The unfolded length of the second arc surface 135 is less than the unfolded length of the first arc surface 133. The design of providing a concave second arc surface 135 on the second plane 132 at the contact point of the first plane 131 and the second plane 132 allows the wrench to avoid the other corner of the nut 2 when rotating, so that the jaws 13 of the wrench will not move away from the nut 2 due to the contact between the nut 2 and the second plane 132. This prevents the jaws 13 of the wrench from disengaging from the nut 2, thus achieving the purpose of completing the tightening of the nut 2 in one go.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A rotary anti-jamming wrench, characterized in that, The device includes a wrench body. The front end of the wrench body has a long jaw and a short jaw. The long jaw and the short jaw form a jaw for engaging nuts. The inner wall of the jaw is composed of a first plane, a second plane, a first arc surface, and a third plane connected sequentially from the short jaw to the long jaw. The angle between the first plane and the second plane is 120°. The length of the first plane is less than the length of the second plane. A lubricating layer is provided at the first arc surface to reduce the friction between the nut and the first arc surface. The unfolded length of the first arc surface is greater than the length of the second plane.

2. The rotary anti-jamming wrench according to claim 1, characterized in that, The first arc surface is provided with a groove, and the lubricating layer is a graphite sheet made of graphite material, which is embedded in the groove.

3. A rotary anti-jamming wrench according to claim 2, characterized in that, The lubricating layer is a solid lubricating coating applied to the first arc surface.

4. A rotary anti-jamming wrench according to claim 1, characterized in that, The second plane has a concave second arc surface on the side closest to the first plane, and the unfolded length of the second arc surface is less than the unfolded length of the first arc surface.

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