CN218624963U

CN218624963U - Expansion type self-tapping screw

Info

Publication number: CN218624963U
Application number: CN202222908986.5U
Authority: CN
Inventors: 桑运德; 耿小超; 胡志辉; 张岩
Original assignee: Jiangsu Wanyuan Stainless Steel Technology Co ltd
Current assignee: Jiangsu Wanyuan Stainless Steel Technology Co ltd
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2023-03-14
Anticipated expiration: 2032-11-02

Abstract

The utility model relates to a fastener technical field specifically is an expansion type self tapping screw, including awl tail, bolt body, screw thread and coiled hair, the awl tail is located bolt body bottom, and the screw thread encircles on bolt body, and the coiled hair is located bolt body's the top. The bolt body is evenly provided with 6-8 anti-skidding barbs, a compressible and deformable thin wall is arranged between the bolt body and the anti-skidding barbs, when the locking screws are locked at fixed positions, the thin wall can be deformed by knocking the pan head with a hammer, the anti-skidding barbs are pushed to expand outwards to be fixed with an object, and the anti-skidding barbs are placed loosely. The utility model has the advantages that: firstly, the self-tapping screw has the expansion function, so that the loosening is prevented; secondly, simple structure, low in manufacturing cost.

Description

Expansion type self-tapping screw

Technical Field

The utility model relates to a fastener technical field specifically is an expansion type self tapping screw.

Background

The expansion screw is a screw which uses wedge-shaped inclination to promote expansion to generate friction gripping force to achieve a fixing effect. The expansion screw consists of a screw rod, an expansion pipe and other parts, the tail part of the screw rod is in a conical shape, and the inner diameter of the conical shape is larger than that of the expansion pipe. When the nut is screwed down, the screw rod moves outwards, the conical part moves through the axial movement of the threads, so that a large positive pressure is formed on the peripheral surface of the expansion pipe, and the angle of the cone is small, so that friction self-locking is formed among the wall body, the expansion pipe and the cone, and the fixing effect is achieved.

The patent number is CN202121261380.6 hidden anti-drop self tapping screw, including the self tapping screw main part, the plum blossom recess has been seted up to the top casing of self tapping screw main part, cavity one has been seted up to the bottom casing of plum blossom recess, cavity two has been seted up to the bottom casing of cavity one, the bottom casing fixedly connected with spring one of cavity two, the top fixedly connected with movable plate of spring one, there is the stopper top casing of movable plate through bolted connection, the left and right sides of stopper all is equipped with the trapezoidal piece, one side casing fixedly connected with fixture block of stopper is kept away from to the trapezoidal piece, the fixture block activity runs through out from the self tapping screw main part casing, the left and right sides casing fixedly connected with fixed plate of cavity two, the fixed plate is located directly over the stopper. But the structure is complex, the production cost is high, and the utility model is not suitable for the public.

Therefore, the utility model provides an expansion type self-tapping screw, simple structure and with low costs.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an expansion type self tapping screw to solve the problem that exists among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an expansion type self tapping screw, includes awl tail, bolt body, screw thread and pan head, and the awl tail is located bolt body bottom, and the screw thread encircles on the bolt body and is located the pan head below, and the pan head is located the top of bolt body, its characterized in that: the bolt body is also provided with anti-slip barbs which are positioned under the pan head and above the threads; the bolt body and the anti-slip barbs are provided with compressible and deformable thin walls.

Preferably, the bolt body and the pan head are provided with mounting holes at the center.

Preferably, the bolt body is provided with a groove for enabling the thin wall to deform outwards.

Preferably, the number of the anti-skid barbs is 6-8, and the anti-skid barbs are uniformly distributed on the periphery of the bolt body.

Preferably, the bottom end of the central mounting hole of the bolt body is provided with a locking cross-shaped disc opening.

Compared with the prior art, the beneficial effects of the utility model are that: firstly, the self-tapping screw has the expansion function, so that the loosening is prevented; secondly, simple structure, low in manufacturing cost.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 1.

In the figure: 1. tapering the tail; 2. a bolt body; 3. a thread; 4. a cross plate port; 5. a groove; 6. anti-slip barbs; 7. thin wall; 8. coiling; 9. and (7) installing holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides an expansion type self tapping screw, includes awl tail 1, bolt body 2, screw thread 3 and pan head 8, bores tail 1 and is located 2 bottoms of bolt body, and screw thread 3 encircles on bolt body 2 and is located pan head 8 below, and pan head 8 is located the top of bolt body 2.

The bolt body 2 is also provided with an anti-skid barb 6, and the anti-skid barb 6 is positioned under the pan head 8 and above the thread 3; 6-8 anti-skid barbs 6 are uniformly distributed around the bolt body 2; a compressible and deformable thin wall 7 is arranged between the bolt body 2 and the anti-skid barbs 6, and the bolt body 2 is provided with a groove 5 which enables the thin wall 7 to deform outwards.

When the locking screw is locked at a fixed position, the thin wall 7 can be deformed by knocking the pan head 8 by a hammer, and the anti-skid barbs 6 are pushed to expand outwards to be fixed with an object and are placed loosely.

The central positions of the bolt body 2 and the pan head 8 are provided with mounting holes 9, and the bottom ends of the mounting holes 9 are provided with locking cross pan openings 4.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an expansion type self tapping screw, includes awl tail (1), bolt body (2), screw thread (3) and coiled hair (8), and awl tail (1) is located bolt body (2) bottom, and screw thread (3) encircle on bolt body (2) and are located coiled hair (8) below, and coiled hair (8) are located the top of bolt body (2), its characterized in that: the bolt body (2) is also provided with anti-skidding barbs (6), and the anti-skidding barbs (6) are positioned under the pan head (8) and above the threads (3); and a compressible and deformable thin wall (7) is arranged between the bolt body (2) and the anti-skidding barb (6).

2. An expansion type self-tapping screw as claimed in claim 1, wherein: and mounting holes (9) are formed in the center positions of the bolt body (2) and the pan head (8).

3. An expansion type self-tapping screw as claimed in claim 1, wherein: the bolt body (2) is provided with a groove (5) which enables the thin wall (7) to deform outwards.

4. An expansion type self-tapping screw as claimed in claim 1, wherein: the number of the anti-skid barbs (6) is 6-8, and the anti-skid barbs are uniformly distributed around the bolt body (2).

5. An expansion type self-tapping screw as claimed in claim 1, wherein: the bottom end of the central mounting hole (9) of the bolt body (2) is provided with a locked cross-shaped disc opening (4).