CN2752516Y

CN2752516Y - Antitheft screw and bolt

Info

Publication number: CN2752516Y
Application number: CN 200420098372
Authority: CN
Inventors: 彭学营
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-16
Filing date: 2004-12-16
Publication date: 2006-01-18
Anticipated expiration: 2014-12-16

Abstract

The utility model provides an antitheft screw or bolt which belongs to the field of a machine fastener and comprises a screw rod and a screw or bolt head, wherein the screw or bolt head is provided with a cross slot which is used for inserting a cross slot of a cross-shaped or line-shaped screw driver. When the cross-shaped or line-shaped screw driver turns around according to the direction of the screwed screw or the bolt, the stress position of the cross slot has four slopes or a cambered surface. The slope or the cambered surface makes the moment of the cross-shaped or line-shaped screw driver be lack of working point, and makes the cross-shaped or line-shaped screw driver retreat from the cross slot along the slope or the cambered surface. When the cross-shaped or line-shaped screw driver is screwed into the screw or the bolt, because the four slopes or the cambered surface position is not stressed, the precession of the screw or the bolt can not be affected. Because the antitheft screw or bolt adopts domed screw or bolt head, tools such as nippers are difficult to screw out of the screw or bolt. The production cost of the utility model is equivalent to the common screw. The utility model can also be tightened without a special tool, and the common screw driver is enough.

Description

Anti-theft screw/bolt

Technical field:

The utility model relates to a kind of screw or bolt, specifically a kind of anti-theft screw/bolt of can only precession and can not screw out.

Background technique:

Screw and bolt are the most frequently used machanical fasteners, and it is with its low price, easy to use and be widely used.But at some special occasions, as license plate, be located at the billboard etc. of outside, usually go out the phenomenon of active, and this moment, plain screw can not satisfy people's requirement.In order to prevent the generation of above-mentioned phenomenon, people have developed a variety of anti-theft screws or bolt, but facts have proved, often there is the structure more complicated in anti-theft screw or bolt on the market at present, the problem that cost is higher, some anti-theft screw also needs to use special tool(s), uses very inconvenient.

Summary of the invention:

Technical assignment of the present utility model is at the deficiencies in the prior art, and what provide is a kind of simple in structure, good anti-theft effect, and cost is low, anti-theft screw/bolt easy to use.

The technological scheme that its technical problem that solves the utility model adopts is:

This anti-theft screw/bolt comprises screw rod and screw/bolt head, on screw/bolt head, have the cross recess that is used to insert cross or in-line screwdriver, cross or in-line screwdriver are when screwing out screw/bolt direction rotation, described cross recessed force part is four or two inclined-planes or cambered surface, the moment that this inclined-plane or cambered surface make cross or in-line screwdriver screw out screw lacks point of action, and makes cross or in-line screwdriver withdraw from cross recess along this inclined-plane or cambered surface.

Anti-theft screw/bolt of the present utility model compared with prior art, the beneficial effect that is produced is:

The utility model only makes improvements the cross recess position on the basis of plain screw or bolt, just can reach antitheft purpose effectively, and need not increase other any component, and cost of production is suitable with plain screw.And when normal mounting is used, need not special tool, only use common screwdriver, the mode of pressing plain screw can be fastening.

Description of drawings:

Accompanying drawing 1 is the main TV structure schematic representation of anti-theft screw/bolt;

Accompanying drawing 2 is the plan structure schematic representation of anti-theft screw/bolt.

Embodiment:

Explain below doing below in conjunction with 1,2 pairs of anti-theft screws of the present utility model of accompanying drawing/bolt.

Shown in accompanying

drawing

1 or 2, anti-theft screw/bolt of the present utility model, its structure is to be made of screw rod 1 and screw/bolt head 2, on screw/bolt head 2, have the cross recess 3 that is used to insert cross or in-line screwdriver, when cross or in-line screwdriver when screwing out the rotation of screw or bolt direction, the force part of described cross recess 3 is four or two along inclined-plane or the cambered surface 4 that dotted line makes progress, the moment that this inclined-plane or cambered surface 4 make cross or in-line screwdriver screw out screw lacks point of action, make screwdriver along the inclined-plane or cambered surface 4 withdraw from cross recess 3; When cross or in-line screwdriver precession screw/bolt, because the point of action of solid line position is arranged, thus do not influence the precession of screw or bolt.

Because this anti-theft screw/bolt adopts hemisphere screw/bolt head 2, feasible instrument with pliers and so on also is difficult to screw out this screw or bolt.

Its processing and fabricating of anti-theft screw/bolt of the present utility model is simple and convenient, and processing and fabricating gets final product shown in the by specification accompanying drawing.

Except that the described technical characteristics of specification, be the known technology of those skilled in the art.

Claims

1, anti-theft screw/bolt, comprise screw rod and screw/bolt head, on screw/bolt head, have the cross recess that is used to insert cross or in-line screwdriver, it is characterized in that, cross or in-line screwdriver are when screwing out screw/bolt direction rotation, described cross recessed force part is four or two inclined-planes or cambered surface, and the moment that this inclined-plane or cambered surface make cross or in-line screwdriver screw out screw lacks point of action, and makes cross or in-line screwdriver withdraw from cross recess along this inclined-plane or cambered surface.

2, anti-theft screw/bolt according to claim 1 is characterized in that, described screw/bolt head is a hemisphere.