CN217372144U

CN217372144U - Novel shape of wrench inner wall contact surface for dismounting bolt or nut

Info

Publication number: CN217372144U
Application number: CN202122853874.XU
Authority: CN
Inventors: 朱中原
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-09-06
Anticipated expiration: 2031-11-19

Abstract

The utility model discloses a novel dismantle the shape of spanner inner wall contact surface of bolt (regular hexagon head bolt hereinafter for short bolt) or nut (regular hexagon nut, hereinafter for short nut), the inner wall has increased an arcwall face at the conventional contact surface of dismantling spanner inner wall and bolt or nut, the arcwall face is the part of orthocircular shape, the arcwall face is the axisymmetric figure in instrument spanner inner wall.

Description

Shape of wrench inner wall contact surface for dismounting bolt or nut

Technical Field

The utility model relates to a bolt disassembling tool, namely a wrench, in particular to the shape of the inner wall of the wrench for disassembling a bolt or a nut.

Background

In our daily lives, various daily tools are used, and most of the tools are provided with various screws and nuts, wherein the common hexagon bolts and nuts are used. When the tool is cleaned, maintained and maintained, certain damage can be caused to the bolt or the nut in the process of disassembly and assembly, and the embarrassing situation that the bolt or the nut is difficult to disassemble and use is caused, so that the tool with small damage to the bolt or the nut is needed.

SUMMERY OF THE UTILITY MODEL

In view of the above, the utility model provides a novel wrench inner wall shape,

the utility model discloses the spanner inner wall has changed the contact point position and the area of contact of dismouting spanner and bolt, nut before, and the life-span that makes it can use is longer.

Before the change, the inner wall of the disassembly wrench is a plane, the contact point of the disassembly wrench and the bolt or the nut starts from each outer corner, and after the mutual abrasion, the contact area is gradually reduced, so that the bolt or the nut is deformed in shape and cannot be normally disassembled and scrapped. The inner wall of the disassembly wrench is arc-shaped after being changed, the contact point is arranged in the middle of each surface of the bolt or the nut at the outer corner, the bolt or the nut is hardly damaged along with mutual abrasion, and the inner wall of the disassembly wrench gradually increases the contact area of the inner wall of the disassembly wrench from the middle of each surface to the corner of the inner wall along with the contact between the arc-shaped inner wall and the bolt or the nut, until the contact area between the inner wall and the inner wall of the disassembly wrench reaches the maximum value when the inner wall of the disassembly wrench is ground into a relative plane.

Drawings

Fig. 1 and 2 are plan views of the inner wall of the present invention in a tool wrench.

Fig. 3 is an enlarged view of a part of the inner wall of fig. 1 of the present invention, which is an enlarged shape of the

marks

1 and 2 in fig. 1: the drawing is marked with 1 as a plane inner wall contact surface before being changed, and the drawing is marked with 2 as an arc inner wall contact surface after being changed.

Fig. 4 is an enlarged view of the inner wall of fig. 2 of the present invention, showing enlarged shapes of

marks

1 and 2 in fig. 2: the drawing is marked with 1 as the flat inner wall contact surface before modification and 2 as the curved inner wall contact surface after modification.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Embodiment 1, refer to fig. 1 for the open end wrench (also called dull spanner) and nut after combining together the plan view after stationary, the centre is the hexagon nut, the outside is the spanner, in the process of dismantling the nut, no matter clockwise rotation, and anticlockwise rotation, because the inner wall of spanner is the arc inner wall, its mutual stress point of contact all begins from the middle part position of each face of nut, along with the wearing and tearing of spanner inner wall can be to increasing the stress area on its angle gradually (the process of spanner wearing and tearing is extremely slow) thereby protect nut edges and corners better, can make its life-span longer.

Embodiment 2. referring to fig. 2, a double offset ring spanner is shown, which is similar to embodiment 1, and the inner wall is arc-shaped, and the arc-shaped inner wall of the double offset ring spanner only has a part of the arc-shaped inner wall of the open end spanner, but the principle is the same.

Claims

1. The shape of the inner wall contact surface of the novel wrench for disassembling the bolt or the nut is characterized in that the shape of the inner wall contact surface changes the original plane-shaped inner wall contact surface into an arc-shaped inner wall contact surface, and the arc-shaped inner wall contact surface is a part of a perfect circle; the arc shape inner wall contact surface distributes at each stress surface of spanner inner wall, and the shape of all arc shape inner wall contact surfaces: the size, the angle and the side length of the utility model are completely consistent; the contact surface of the arc-shaped inner wall is distributed in the inner wall of the wrench and is an axisymmetric pattern; the radian of the contact surface of the arc-shaped inner wall is less than or equal to 15 degrees and is greater than 0 degree.