CN2373609Y

CN2373609Y - Self-tapping screw

Info

Publication number: CN2373609Y
Application number: CN 98204853
Authority: CN
Inventors: 许水清
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-05-26
Filing date: 1998-05-26
Publication date: 2000-04-12
Anticipated expiration: 2008-05-26

Abstract

The utility model relates to a novel self-tapping screw. The self-tapping screw has the structure that a screw head (11) which is used for holding, shrinking and rotating a body (1) by tools is arranged above the body (1), and a terminal (12) of a groove (121), which has the functions of cutting and chip discharging is arranged below the body (1). The self-tapping screw is characterized in that a spiral cross grain (13) which is provided with a plurality of corner surfaces and sharp corner sides (131) is arranged between the screw head (11) and the terminal (12). The utility model has the advantages of labor-saving operation and use, fastening operation and use, firmness, easily cutting, shock resistance, and safety.

Description

A kind of novel self tapping screw

The utility model relates to the fastening piece class, particularly a kind of novel self tapping screw.

As known to the public, general common self tapping screw structure, as shown in Figure 1, its structure is nothing more than being the screw terminal (21) that is provided with in body (2) top for the confession turn of instrument fit clamping, and in order to make body (2) can screw in the iron and steel, be provided with cylindrical screw bar (23) in its body (2) stage casing, and its termination, below (22) offers for the groove (221) that cuts in a side, because common self tapping screw structural design is bad, therefore its to cut in the process of self tapping be to be whole contact, must execute sizable strength, its chip removal is bad again, thus be easy to cause body (2) or its termination (22) because of reversing stuck the fracture, very inconvenient on the constructing operation, moreover its body (2) mainly is that mat cylindrical screw bar (23) spiral shell is established, because of there not being any support, therefore be easy to cause loose or dislocation, be difficult for fastening, and can't be shockproof, be absolutely unsafe.

The purpose of this utility model is exactly the shortcoming that exists at above-mentioned common self tapping screw, and a kind of novel self tapping screw is provided.

The technical solution of the utility model:

Structure of the present utility model mainly is intersegmental in the last body that has screw terminal and a termination, be provided with face polygon spiral twill more than the tool wedge angle limit, its objective is when screwing in toward steel plate, be with a contact cutting, laborsaving during rotation, chip removal is good, and stuck broken end does not take place, and operates fastening, shockproof difficult drop-off.

Below in conjunction with description of drawings structure of the present utility model and embodiment:

Fig. 1 is the schematic perspective view of common self tapping screw.

Fig. 2 is a schematic perspective view of the present utility model.

Fig. 3 is a plan view of the present utility model.

Fig. 4 is a worm's eye view of the present utility model.

(1) be that body, (11) are that wedge angle limit, (2) for body, (21) for screw terminal, (22) for termination, (221) for groove, (23) be cylindrical screw bar for groove, (13) for spiral twill, (131) for termination, (121) for screw terminal, (12).

Shown in accompanying drawing 2, accompanying drawing 3, structure of the present utility model is the screw terminal (11) that is provided with in body (1) top for tool holding fit rotating body (1), its below then is provided with the termination (12) of the groove (121) of tool cutting and chip removal, is provided with the spiral twill (13) on polygonal mask wedge angle limit (131) between screw terminal (11) and termination (12).

4 embodiment of the present utility model is described in conjunction with the accompanying drawings:

As shown in Figure 4, because the cutting point that the utility model provides, be the groove (121) of in the termination (12) and spiral twill (13) with wedge angle limit (131), spiral twill (13) changes over to when making self tapping in the iron and steel again, and be not the contact of making face as common self tapping screw with its cylindrical screw bar (23), but cut with the some contact that is the polygon face, spiral twill of the present utility model (13) is the hex surface body, so it is to contact with the set hole of iron and steel with wedge angle limit (131) during cutting, during turn-knob body (1), more common self tapping screw is saved very big strength, and therefore operation is quite laborsaving, good cutting, moreover its every set spiral twill (13), quite fastening when locking, and holding power is arranged, when meeting earthquake and shaking, difficult drop-off, shockproof and Security is preferable, its groove (121) chip removal simultaneously and the cutting, good chip removal performance is all arranged, can not cause situation stuck or fracture during self tapping at every surface helix twill (13) except that termination (12).

Claims

1, a kind of novel self tapping screw, its structure is the screw terminal (11) that is provided with in body (1) top for tool holding fit rotating body (1), its below then is provided with the termination (12) of the groove (121) of tool cutting and chip removal, it is characterized in that, be provided with the spiral twill (13) on polygonal mask wedge angle limit (131) between screw terminal (11) and termination (12).

2,, it is characterized in that said spiral twill (13) is to be the hex surface body according to the described a kind of novel self tapping screw of claim 1.