Manual wrench and wrench head thereof

Abstract

The utility model relates to the technical field of wrench tools, in particular to a manual wrench and a wrench head thereof. A wrench head of the manual wrench is provided with a wrenching cavity used for being arranged on a round nut in a sleeving mode, a wrenching position used for wrenching the round nut is arranged in the wrenching cavity, the wrenching position comprises two inclined faces which are arranged on the inner wall of the wrenching cavity and form an included angle, and the inclined faces are provided with tooth-shaped structures used for clamping knurls on the peripheral face of the round nut. The wrench head is sleeved on the circular nut and moves along the radial direction of the circular nut, so that the circular nut is clamped by the two inclined surfaces of the wrenching position for wrenching operation after entering the wrenching position. The two inclined planes forming the included angle are used for clamping the round nuts, the round nuts with different diameters can be combined to different positions of the inclined planes, and therefore the spanner head is suitable for the round nuts with different diameters, universality of the spanner head is improved, cost is saved, and use is convenient.

Description

A manual wrench and its wrench head Technical Field

[0001] This utility model relates to the field of wrench tools, specifically to a manual wrench and its wrench head. Background Technology

[0002] Hand wrenches are common manual tightening tools, and their use and construction are relatively simple. The main components include the handle and the wrench head. The wrench head, also called the "tool head," comes in various types based on function and shape. Common wrench heads include fixed wrench heads (usually hexagonal heads), adjustable wrench heads, box wrench heads, socket wrench heads, internal hex wrench heads, and combination wrench heads. Different wrench heads have different applications. For example, the six faces of a hexagonal wrench head can firmly grip the nut, thus providing greater clamping force; a box wrench head, with its ring-shaped design, is suitable for tightening or loosening polygonal nuts.

[0003] The common wrench heads mentioned above largely solve the clamping problem for most polygonal nuts. However, some equipment uses knurled round nuts, for which ordinary wrench heads cannot clamp and tighten. Existing technology uses a socket with internal teeth in conjunction with a wrench handle to tighten these round nuts. The internal teeth of the socket match the knurled pattern on the outer surface of the round nut. In use, the socket is axially placed on the nut, and the internal teeth of the socket interlock with the pattern on the outer surface of the nut, preventing rotation. Then, the handle is turned to tighten the knurled round nut. This tightening method protects the pattern on the outer surface of the nut and utilizes the space above the nut for tightening, making it suitable for operations in confined spaces.

[0004] However, existing socket wrench heads require sockets to be matched with nuts one-to-one. For knurled round nuts of different diameters, different sizes of sockets are required, which is costly and cumbersome to use. Summary of the Invention

[0005] The purpose of this utility model is to provide a wrench head for a manual wrench to solve the problem that the current method requires different sizes of sockets to be used for knurled round nuts of different diameters, resulting in high costs and inconvenience in use; the purpose of this utility model is also to provide a manual wrench to solve the above problems.

[0006] The technical solution for the wrench head of this utility model is:

[0007] A manual wrench has a wrench head with a wrench-tightening cavity for fitting onto a round nut. The wrench-tightening cavity has a wrench-tightening position for tightening the round nut. The wrench-tightening position includes two inclined surfaces set at an included angle on the inner wall of the wrench-tightening cavity. The inclined surfaces have toothed structures for engaging the knurled outer circumference of the round nut. After the wrench head is fitted onto the round nut and moves radially along the round nut to allow the round nut to enter the wrench-tightening position, it is engaged by the two inclined surfaces of the wrench-tightening position for tightening operation.

[0008] Beneficial Effects: This utility model innovatively provides a wrench head suitable for tightening round nuts of different diameters. A tightening position is provided within the tightening cavity of the wrench head, featuring two angled bevels with toothed structures. In use, the wrench head is placed on the round nut, but not yet fully engaged. By moving the wrench head radially along the nut, the nut enters the space between the two bevels until they are engaged. At this point, the nut is in the tightening position, where the two bevels engage with the outer circumference of the nut. The toothed structures on the bevels engage the knurled outer surface of the nut, creating an anti-rotation fit and allowing tightening operations. Because the angled bevels engage the nut, round nuts of different diameters can be fitted to different positions on the bevels, thus adapting to various nut diameters, improving the wrench head's versatility, saving costs, and facilitating use.

[0009] Furthermore, there are at least two wrench positions.

[0010] Furthermore, there are two wrench positions, which are symmetrically arranged about the center of the wrench cavity.

[0011] Furthermore, the inclined surfaces of the two wrench positions on the same side are connected.

[0012] Furthermore, the portion of the inner wall of the wrench cavity between two inclined surfaces located at the same wrench position is provided with an arc surface.

[0013] Furthermore, the tooth-shaped structure is formed by opening semi-circular grooves on the inclined surface, with each semi-circular groove spaced apart along the inclined direction of the inclined surface, and the semi-circular grooves extending along the thickness direction of the wrench head.

[0014] Furthermore, the wrench head has a ring-shaped structure, and a fixing structure for coaxially fixing the wrench handle is provided on one end face of the wrench head.

[0015] Furthermore, the wrench head has a ring-shaped structure, and a fixing structure is provided on the outer circumference of the wrench head for fixing and connecting the handle extending perpendicular to the axis of the wrench head.

[0016] Furthermore, the wrench-tightening cavity extends along the thickness direction of the wrench head.

[0017] The technical solution of this utility model's manual wrench is:

[0018] A manual wrench includes a handle and a wrench head. The wrench head has a tightening cavity for fitting onto a round nut. The tightening cavity has a tightening position for tightening the round nut. The tightening position includes two inclined surfaces on the inner wall of the tightening cavity, which are arranged at an included angle. The inclined surfaces have toothed structures for engaging the knurled outer circumference of the round nut. After the wrench head is fitted onto the round nut and moves radially along the round nut to allow the round nut to enter the tightening position, it is engaged by the two inclined surfaces of the tightening position for tightening operation.

[0019] Beneficial Effects: This utility model innovatively provides a wrench head suitable for tightening round nuts of different diameters. A tightening position is provided within the tightening cavity of the wrench head, featuring two angled bevels with toothed structures. In use, the wrench head is placed on the round nut, but not yet fully engaged. By moving the wrench head radially along the nut, the nut enters the space between the two bevels until they are engaged. At this point, the nut is in the tightening position, where the two bevels engage with the outer circumference of the nut. The toothed structures on the bevels engage the knurled outer surface of the nut, creating an anti-rotation fit and allowing tightening operations. Because the angled bevels engage the nut, round nuts of different diameters can be fitted to different positions on the bevels, thus adapting to various nut diameters, improving the wrench head's versatility, saving costs, and facilitating use.

[0020] Furthermore, there are at least two wrench positions.

[0021] Furthermore, there are two wrench positions, which are symmetrically arranged about the center of the wrench cavity.

[0022] Furthermore, the inclined surfaces of the two wrench positions on the same side are connected.

[0023] Furthermore, the portion of the inner wall of the wrench cavity between two inclined surfaces located at the same wrench position is provided with an arc surface.

[0024] Furthermore, the tooth-shaped structure is formed by opening semi-circular grooves on the inclined surface, with each semi-circular groove spaced apart along the inclined direction of the inclined surface, and the semi-circular grooves extending along the thickness direction of the wrench head.

[0025] Furthermore, the wrench head has a ring-shaped structure, and a fixing structure for coaxially fixing the wrench handle is provided on one end face of the wrench head.

[0026] Furthermore, the wrench head has a ring-shaped structure, and a fixing structure is provided on the outer circumference of the wrench head for fixing and connecting the handle extending perpendicular to the axis of the wrench head.

[0027] Furthermore, the wrench-tightening cavity extends along the thickness direction of the wrench head. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the structure of the wrench head of the manual wrench according to an embodiment of the present invention;

[0029] Figure 2 is a front view of the wrench head of the manual wrench according to an embodiment of the present invention;

[0030] Figure 3 is a magnified view of part A in Figure 2.

[0031] In the diagram: 1. Tightening cavity; 2. Inclined surface; 3. Arc surface; 4. Toothed structure; 5. Semi-circular groove. Detailed Implementation

[0032] The basic concept of the manual wrench of this utility model is that after the wrench head is put on the nut, the round nut is held in place by two inclined surfaces forming an angle. Round nuts of different diameters can be engaged at different positions of the inclined surfaces, thereby adapting to round nuts of different diameters and improving the versatility of the wrench head.

[0033] The technical solution of this utility model will be described in detail below with reference to specific embodiments.

[0034] An embodiment of the wrench head of this utility model manual wrench:

[0035] As shown in Figures 1, 2, and 3, the wrench head of the manual wrench is generally ring-shaped. The outer circumference of the wrench head includes two opposing arc-shaped sides and two opposing straight sides. The wrench head is provided with a wrench-tightening cavity 1, which is the inner cavity enclosed by the ring body of the wrench head. The wrench head can be fitted onto the circular nut from one axial side. After the wrench head is fitted onto the circular nut, the circular nut is located inside the wrench-tightening cavity 1.

[0036] The wrench cavity 1 is provided with a wrench position for wrenching a round nut. The wrench position includes two inclined surfaces 2 set at an included angle on the inner wall of the wrench cavity 1. The inclined surfaces 2 are provided with toothed structures 4 for locking the knurled outer circumference of the round nut. After the wrench head is put on the round nut and moves radially along the round nut to make the round nut enter the wrench position, it is locked by the two inclined surfaces 2 of the wrench position for wrenching operation.

[0037] When in use, the wrench head is placed on the round nut. At this point, the wrench head is not yet locked onto the round nut. By moving the wrench head radially along the round nut, the round nut is brought into the space between the two inclined surfaces 2 until it is locked onto the two inclined surfaces 2. At this point, the round nut is in the tightening position. The two inclined surfaces 2 in the tightening position are locked onto the outer circumference of the round nut. The toothed structure 4 on the inclined surfaces 2 locks onto the knurled outer circumference of the round nut. The two inclined surfaces 2 form an anti-rotation fit with the round nut, thus allowing the tightening operation. Because the round nut is locked by the two inclined surfaces 2 at an angle, round nuts of different diameters can be fitted to different positions on the inclined surfaces 2, thus adapting to round nuts of different diameters, improving the versatility of the wrench head, saving costs, and making it convenient to use.

[0038] The wrench position refers to the location of the two inclined surfaces 2 facing each other and forming an angle within the wrench cavity 1. There are at least two wrench positions; in this embodiment, there are two. The appropriate wrench position can be selected according to usage needs. The sizes of the different wrench positions can be the same or different, allowing for flexible use. The central area of ​​the wrench cavity 1 at the junction of the wrench positions is relatively large, larger than the diameter of the circular nut, to facilitate the smooth placement of the wrench head onto the circular nut. In other embodiments, only one wrench position may be provided. Accordingly, the wrench position is located on one side of the wrench cavity in the left-right direction, while the other side has a larger semi-circular hole to facilitate the wrench head being placed onto the circular nut, and then radially offset to allow the circular nut to engage with the two inclined surfaces.

[0039] There are two wrench positions, symmetrically arranged about the center of the wrench cavity 1, meaning they are symmetrically positioned left and right. The distance between the two inclined surfaces 2 of the same wrench position is greater the closer it is to the center of the wrench cavity 1. The toothed structures 4 on the inclined surfaces 2 of the two wrench positions are identical. In use, after the wrench head is placed on the round nut, it can hold the round nut whether it is moved to the left or right. Moreover, during the tightening process, the wrench position can be switched by moving left or right as needed, making it flexible to use. In other embodiments, there may be three or more wrench positions distributed circumferentially; the toothed structures of each wrench position may be the same or different; the included angles of the two inclined surfaces of each wrench position may be the same or different.

[0040] The inclined surfaces 2 on the same side of the two wrench positions are connected, that is, the front inclined surface 2 of the left wrench position is connected to the front inclined surface 2 of the right wrench position, and the rear inclined surface 2 of the left wrench position is connected to the rear inclined surface 2 of the right wrench position. The maximum distance between the two inclined surfaces 2 of the wrench positions is the central area of ​​the wrench cavity 1, so as to facilitate the wrench head to fit on the round nut and avoid the wrench head being too large, thus facilitating processing. In other embodiments, the inner wall of the wrench cavity can also have an arc surface located between the two wrench positions to form a larger space in the central area of ​​the wrench cavity.

[0041] The wrench head has an axial direction, which is also the thickness direction. The wrench head cavity 1 extends through the thickness direction of the wrench head, which facilitates processing and allows observation of the relative position of the wrench head and the circular nut. In other embodiments, the wrench head cavity can also be a blind hole structure, with one end open and the other end closed.

[0042] The inner wall of the wrench cavity 1 has an arc surface 3 between two inclined surfaces 2 located at the same wrench position. The inner wall surface of the wrench cavity 1 includes the arc surface 3 and the inclined surfaces 2. The arc surface 3 is connected to the two adjacent inclined surfaces 2 by a plane transition, and the included angle between the two inclined surfaces 2 is set as needed. When the two inclined surfaces 2 hold the nut, the arc surface 3 does not contact the nut. The arc surface 3 is used to avoid obstructing the nut, while also preventing the wrench head from becoming too large.

[0043] The toothed structure 4 on the inclined surface 2 is formed by creating semi-circular grooves 5 on the inclined surface 2. These semi-circular grooves 5 are spaced apart along the inclination direction of the inclined surface 2 and extend along the thickness direction of the wrench head. The portion between two adjacent semi-circular grooves 5 forms the toothed structure 4, which can accommodate the knurled surface of the outer circumference of a knurled circular nut. Two inclined surfaces 2 at the same wrench position form a groove. The diameter of the circle containing the knurled pattern of the semi-circular groove 5 on the inner wall of the groove can be the same or different. The size of the semi-circular groove 5 can be set as needed, such as the diameter of the circle containing it being 0.18 mm or 0.30 mm.

[0044] The wrench head can be coaxially connected to the handle, with the handle located on the axial side of the wrench head; alternatively, the handle can be connected to the vertical axial side of the wrench head, with the handle located on the radial side of the wrench head.

[0045] For the type of coaxial connection wrench handle, a fixing structure for coaxially fixing the wrench handle is provided on one end face of the wrench head. The wrench handle includes a fixed shaft and a wrench lever. One end of the fixed shaft is welded to the end face of the wrench head and the fixed shaft is coaxially arranged with the wrench head. The other end of the fixed shaft is welded to the wrench lever. The extension direction of the wrench lever is perpendicular to the axial direction of the wrench head. By rotating the wrench lever, the wrench head can be driven to perform a wrenching operation.

[0046] For wrench heads with the handle attached to one side of the vertical axis, the outer circumference of the wrench head has a fixing structure for securing the handle, which extends perpendicular to the wrench head axis. One end of the rod-shaped handle can be directly welded to the outer circumference of the wrench head, with the handle extending perpendicular to the wrench head axis. Tightening torque can be applied by gripping the other end of the handle. To ensure that the toothed structure on the bevel engages the nut, a certain force perpendicular to the wrench head axis can be applied to the handle.

[0047] For round nuts with knurled outer surfaces, they are usually used in situations where the tightening force is very small. The meshing force between the toothed structure 4 on the bevel 2 of the wrench and the knurled outer surface of the round nut does not need to be large. The nut can be turned by using the two bevels 2 to hold it in place, and the required wrenching force is very small.

[0048] This wrench head is suitable for clamping round nuts of different sizes with straight knurled surfaces. It grips round nuts well and features double slots for flexible use. To use, slip the wrench head onto the center line of the nut, then move it to either the left or right until the groove on the inner wall of the wrench head engages with the knurled surface of the nut. The wrench handle will then tighten or loosen the round nut.

[0049] Embodiments of the manual wrench of this utility model:

[0050] The manual wrench includes a handle and a wrench head that are fixedly connected. The wrench head has the same structure as the manual wrench in the above embodiment, and will not be described again here.

[0051] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wrench head for a manual wrench, characterized in that, The wrench head has a wrench-tightening cavity for fitting onto a round nut. The wrench-tightening cavity has a wrench-tightening position for tightening the round nut. The wrench-tightening position includes two inclined surfaces on the inner wall of the wrench-tightening cavity, which are set at an included angle. The inclined surfaces have toothed structures for locking the knurled outer circumference of the round nut. After the wrench head is fitted onto the round nut and moves radially along the round nut so that the round nut enters the wrench-tightening position, it is locked by the two inclined surfaces of the wrench-tightening position for tightening operation.

2. The wrench head of the manual wrench according to claim 1, characterized in that, There are at least two wrench positions.

3. The wrench head of the manual wrench according to claim 2, characterized in that, There are two wrench positions, which are symmetrically arranged about the center of the wrench cavity.

4. The wrench head of the manual wrench according to claim 3, characterized in that, The inclined surfaces of the two wrench positions on the same side are connected.

5. The wrench head of the manual wrench according to any one of claims 1-4, characterized in that, The portion of the inner wall of the wrench chamber between two inclined surfaces located at the same wrench position has an arc surface.

6. The wrench head of the manual wrench according to any one of claims 1-4, characterized in that, The tooth-shaped structure is formed by opening semi-circular grooves on the inclined surface. The semi-circular grooves are distributed at intervals along the inclined direction of the inclined surface and extend along the thickness direction of the wrench head.

7. The wrench head of the manual wrench according to any one of claims 1-4, characterized in that, The wrench head has a ring-shaped structure, and a fixing structure for coaxially connecting the handle is provided on one end face of the wrench head.

8. The wrench head of the manual wrench according to any one of claims 1-4, characterized in that, The wrench head has a ring-shaped structure, and a fixing structure is provided on the outer circumference of the wrench head for fixing and connecting the handle that extends perpendicular to the axis of the wrench head.

9. The wrench head of the manual wrench according to any one of claims 1-4, characterized in that, The wrench head has a through-hole that runs along the thickness of the wrench head.

10. A manual wrench, characterized in that, Includes a wrench handle and a wrench head of the manual wrench as described in any one of claims 1-9.

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