A clamping structure of a wrench

Abstract

The utility model provides a kind of clamping structure of spanner, belong to spanner technical field.It has solved the problem that the engagement tooth and workpiece contact area are limited in the clamping structure of existing spanner, and uneven stress is easy to slip.The clamping structure includes clamping body, and clamping body is equipped with the clamping mouth for accommodating workpiece, clamping mouth has opposite first clamping wall and second clamping wall, and first clamping wall and / or second clamping wall is recessed with multiple trapezoidal tooth grooves extending along the depth direction of clamping mouth, and the cross section of trapezoidal tooth groove is trapezoidal.The utility model forms larger area surface contact by the inclined plane of trapezoidal tooth groove and workpiece, significantly enhances clamping friction and firmness, stress is more uniform, operation is stable, and can better adapt to different size workpieces, prolongs tool service life.

Description

Technical Field

[0001] This utility model relates to the field of wrench technology, specifically to a wrench clamping structure. Background Technology

[0002] Wrenches, as common hand tools, are widely used for tightening or loosening bolts, nuts, and other workpieces. Their basic structure typically includes a handle and a clamping body at one end, with an opening to accommodate and hold the workpiece. To improve clamping effectiveness and prevent workpiece slippage or damage, existing technologies enhance clamping force by incorporating teeth or grooves on the inner wall of the opening. However, these teeth or grooves often employ an arc or semi-circular structure. The limited contact area between these arc or semi-circular grooves and the workpiece, especially under uneven or skewed force, can easily lead to localized slippage and insecure clamping. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a clamping structure for a wrench. The technical problem this invention aims to solve is how to increase the contact area of ​​the workpiece, prevent uneven force distribution on the workpiece from slipping, and enhance clamping firmness.

[0004] The objective of this utility model can be achieved through the following technical solution: a clamping structure for a wrench, including a clamping body, wherein a clamping opening for accommodating a workpiece is formed on the clamping body, the clamping opening having a first clamping wall and a second clamping wall disposed opposite to each other, and a plurality of trapezoidal toothed grooves extending along the depth direction of the clamping opening are recessed on the first clamping wall and / or the second clamping wall, wherein the cross-section of the trapezoidal toothed grooves is trapezoidal.

[0005] Furthermore, the bottom width of the trapezoidal tooth groove is smaller than its opening width.

[0006] Furthermore, the clamping opening also has a third clamping wall and a fourth clamping wall connected to the first clamping wall and the second clamping wall. The third clamping wall is connected to the first clamping wall and is set at an angle, and the fourth clamping wall is connected to the second clamping wall and is set at an angle. A first large tooth groove is defined between the third clamping wall and the first clamping wall, and a second large tooth groove is defined between the fourth clamping wall and the second clamping wall. The cross-sections of the first large tooth groove and the second large tooth groove are trapezoidal.

[0007] Furthermore, the groove depths of the first large tooth groove and the second large tooth groove are greater than the groove depth of the trapezoidal tooth groove.

[0008] Furthermore, the clamping opening also has a fifth clamping wall connected to the first clamping wall and the second clamping wall, and the fifth clamping wall is arc-shaped.

[0009] Furthermore, the trapezoidal toothed grooves are continuously or intermittently arranged along the depth direction of the clamping opening.

[0010] Furthermore, the first clamping wall and the second clamping wall are both provided with the trapezoidal toothed grooves, and the trapezoidal toothed grooves on the two side walls are symmetrically distributed.

[0011] Furthermore, both the first clamping wall and the second clamping wall are provided with the trapezoidal toothed grooves, and the trapezoidal toothed grooves on the two side walls are asymmetrically distributed.

[0012] Furthermore, a first transition arc surface is provided between the trapezoidal tooth groove and the first clamping wall, and a second transition arc surface is provided between the trapezoidal tooth groove and the second clamping wall.

[0013] Furthermore, the trapezoidal groove includes a first inclined surface and a second inclined surface, the first inclined surface and the second inclined surface are arranged opposite each other and form an included angle, and the two are connected by a groove bottom, thereby forming the trapezoidal cross section.

[0014] Compared with existing technologies, the technical effects of this utility model are as follows: 1. The trapezoidal tooth groove with a trapezoidal cross-section can form a larger and closer surface contact with the workpiece, greatly increasing the effective contact area, thereby generating greater friction when force is applied, making the workpiece less prone to slippage, and significantly enhancing the clamping firmness. 2. The first and second inclined surfaces of the trapezoidal tooth groove can more evenly distribute the clamping force and torque applied to the workpiece. When the wrench is subjected to uneven force or is slightly tilted, the first and second inclined surfaces can provide guidance and compensation, so that the force can still be transmitted to the workpiece relatively evenly, improving operational stability and safety. 3. The arc-shaped fifth clamping wall allows the clamping opening to better accommodate and adapt to workpieces of different sizes or non-ideal alignment, guiding the workpiece into the optimal clamping position. 4. The flexibility of the trapezoidal tooth groove, which can be continuous or spaced, symmetrical or asymmetrical, also allows for design optimization for workpieces of different specifications and uses, improving the tool's applicability. 5. The trapezoidal toothed groove is connected to the first and second clamping walls by a first transition arc surface and a second transition arc surface, respectively, avoiding sharp corners. This smooth transition effectively reduces stress concentration and prevents cracks or damage at the root of the toothed groove under repeated high-intensity use, thereby extending the service life of the wrench clamping structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the workpiece and clamping body in Embodiment 1 of this utility model.

[0016] Figure 2 This is a schematic diagram of one embodiment of the present utility model.

[0017] Figure 3 This is a schematic diagram of Embodiment 2 of this utility model.

[0018] Figure 4 This is a schematic diagram of Embodiment 3 of this utility model.

[0019] Figure 5 This is a schematic diagram of Embodiment 4 of this utility model.

[0020] Figure 6 This is a schematic diagram of Embodiment 5 of this utility model.

[0021] Drawing number markings: 1. Clamping body; 2. Trapezoidal toothed groove; 10. Clamping opening; 11. First clamping wall; 12. Second clamping wall; 13. Third clamping wall; 14. Fourth clamping wall; 15. Fifth clamping wall; 16. First transition arc surface; 17. Second transition arc surface; 21. First inclined surface; 22. Second inclined surface; 23. Groove bottom; 3. Workpiece; 4. First large toothed groove; 5. Second large toothed groove. Detailed Implementation

[0022] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0023] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Example 1: As Figure 1 Figure 2 As shown, this utility model provides a wrench clamping structure. The structure mainly includes a clamping body 1. At one end of the clamping body 1, a clamping opening 10 is formed for accommodating and clamping a workpiece 3 such as a bolt or nut.

[0025] The clamping opening 10 has a first clamping wall 11 and a second clamping wall 12 arranged opposite to each other. To significantly enhance the clamping force and anti-slip effect on the workpiece 3, multiple trapezoidal grooves 2 extending along the depth direction of the clamping opening 10 are recessed on the first clamping wall 11 and the second clamping wall 12. Crucially, the cross-section of each trapezoidal groove 2 is trapezoidal. Specifically, each trapezoidal groove 2 includes a first inclined surface 21 and a second inclined surface 22 arranged opposite to each other, forming an included angle between the first inclined surface 21 and the second inclined surface 22, and connected by a groove bottom 23, thus forming a trapezoidal profile that is wider at the top and narrower at the bottom, i.e., the width W1 of the groove bottom 23 is smaller than the width W2 at the groove opening. Figure 1The first inclined surface 21 and the second inclined surface 22 shown abut against the side surface of the workpiece 3. The first inclined surface 21 and the second inclined surface 22 form a larger and more stable contact area with the side surface of the workpiece 3, making the force distribution more uniform, thereby effectively preventing the workpiece 3 from slipping off locally when it is subjected to force deviation.

[0026] Furthermore, the trapezoidal grooves 2 can be spaced apart along the depth direction of the clamping opening 10. In a preferred embodiment, both the first clamping wall 11 and the second clamping wall 12 are provided with the trapezoidal grooves 2, and the trapezoidal grooves 2 on the two side walls are asymmetrically distributed. The number of trapezoidal grooves 2 on the first clamping wall 11 and the second clamping wall 12 is inconsistent, forming an asymmetrical distribution. This asymmetrical design can further increase the randomness and firmness of clamping.

[0027] In order to optimize structural strength and avoid stress concentration, a first transition arc surface 16 is provided at the junction of the trapezoidal tooth groove 2 and the plane of the first clamping wall 11, and a second transition arc surface 17 is provided at the junction of the trapezoidal tooth groove 2 and the plane of the second clamping wall 12.

[0028] Furthermore, the clamping opening 10 also has a third clamping wall 13 and a fourth clamping wall 14. The third clamping wall 13 is connected to the first clamping wall 11 at a certain angle, defining a space between them, called the first large tooth groove 4. Similarly, the fourth clamping wall 14 is connected to the second clamping wall 12 at a certain angle, defining the second large tooth groove 5 between them. It is worth noting that the cross-sections of the first large tooth groove 4 and the second large tooth groove 5 are also designed to be trapezoidal.

[0029] Example 2: Root Figure 3 As shown, this embodiment has the same basic structure as embodiment one, the main difference being that the trapezoidal toothed groove 2 is continuously arranged along the depth direction of the clamping opening 10.

[0030] Example 3: Figure 4 As shown, this embodiment has the same basic structure as Embodiment 1, the main difference being that the trapezoidal grooves 2 provided on the first clamping wall 11 and the second clamping wall 12 are symmetrically distributed. That is, the number and position of the trapezoidal grooves 2 on the first clamping wall 11 and the second clamping wall 12 are symmetrical. This symmetrical design makes the clamping force more balanced relative to the center line of the clamping opening, which helps to center the workpiece 3 and reduces wrench deflection caused by uneven force.

[0031] Example 4: Figure 5As shown, the clamping opening 10 in this embodiment also has a fifth clamping wall 15. This fifth clamping wall 15 connects the first clamping wall 11 and the second clamping wall 12, and is arc-shaped. The fifth clamping wall 15 replaces the aforementioned third clamping wall 13 and fourth clamping wall 14. This arc-shaped bottom wall design is particularly suitable for clamping cylindrical workpieces 3 or when the root of the workpiece 3 has an arc transition, providing better fit and containment.

[0032] Example 5: Figure 6 As shown, in this embodiment, trapezoidal toothed grooves 2 are provided only on the first clamping wall 11 or only on the second clamping wall 12.

[0033] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A clamping structure for a wrench, comprising a clamping body having a clamping opening for receiving a workpiece, characterized in that: The clamping opening has a first clamping wall and a second clamping wall arranged opposite to each other. The first clamping wall and / or the second clamping wall are provided with a plurality of trapezoidal grooves extending along the depth direction of the clamping opening. The cross-section of the trapezoidal grooves is trapezoidal.

2. The clamping structure for a wrench according to claim 1, characterized in that: The bottom width of the trapezoidal tooth groove is smaller than its opening width.

3. The clamping structure for a wrench according to claim 1, characterized in that: The clamping opening also has a third clamping wall and a fourth clamping wall connected to the first clamping wall and the second clamping wall. The third clamping wall is connected to the first clamping wall and is set at an angle. The fourth clamping wall is connected to the second clamping wall and is set at an angle. A first large tooth groove is defined between the third clamping wall and the first clamping wall. A second large tooth groove is defined between the fourth clamping wall and the second clamping wall. The cross-sections of the first large tooth groove and the second large tooth groove are trapezoidal.

4. The clamping structure for a wrench according to claim 3, characterized in that: The groove depths of the first and second large tooth grooves are greater than the groove depth of the trapezoidal tooth groove.

5. The clamping structure for a wrench according to claim 1, characterized in that: The clamping opening also has a fifth clamping wall connected to the first clamping wall and the second clamping wall, and the fifth clamping wall is arc-shaped.

6. The clamping structure for a wrench according to claim 1, characterized in that: The trapezoidal toothed grooves are arranged continuously or at intervals along the depth direction of the clamping opening.

7. A wrench clamping structure according to any one of claims 1 to 6, characterized in that: Both the first clamping wall and the second clamping wall are provided with the trapezoidal toothed grooves, and the trapezoidal toothed grooves on the two side walls are symmetrically distributed.

8. A wrench clamping structure according to any one of claims 1 to 6, characterized in that: Both the first clamping wall and the second clamping wall are provided with the trapezoidal toothed grooves, and the trapezoidal toothed grooves on the two side walls are asymmetrically distributed.

9. The clamping structure for a wrench according to claim 8, characterized in that: A first transition arc surface is provided between the trapezoidal tooth groove and the first clamping wall, and a second transition arc surface is provided between the trapezoidal tooth groove and the second clamping wall.

10. The clamping structure for a wrench according to claim 9, characterized in that: The trapezoidal groove includes a first inclined surface and a second inclined surface. The first inclined surface and the second inclined surface are arranged opposite each other and form an included angle. The two are connected by a groove bottom, thereby forming the trapezoidal cross-section.

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