CN2266052Y

CN2266052Y - Theft-proof fastener of check bolt and nut

Info

Publication number: CN2266052Y
Application number: CN 96201365
Authority: CN
Inventors: 迟宏刚
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-02-07
Filing date: 1996-02-07
Publication date: 1997-10-29
Anticipated expiration: 2006-02-07

Abstract

The utility model relates to a theft-proof non-return anti-loosing fastener of a bolt and a nut. A plurality of axial pin grooves which are corresponding to the shapes of pin keys are arranged on the screw thread part of the bolt; a plurality of axial pin grooves which are corresponding to the shapes of the pin keys are arranged on the inner screw thread part of the nut. A horn-shaped gap is arranged on the bottom of each pin groove; a pin key is made of plastic materials, the cross section of the pin key is rectangular, a lambdoidal furcation is arranged on the lower end of the pin key, and the length of the pin key is corresponding to the thickness of the nut. The lower end of the pin key of the utility model is expanded to be clamped into the horn-shaped gap of the lower end of the pin groove of the nut to prevent the pin key from returning to cause the pin key not to be loose. The utility model has the advantages of firm connection, non-return anti-loosing performance, large driving torque, theft-proof performance, convenient installation, etc.

Description

The anti-loosening bolt and nut fastening piece of antitheft non-return

The utility model relates to the bolt and nut fastening piece, refers in particular to a kind of antitheft bolt and nut fastening piece that the anti-loosening function of non-return is arranged.

The bolt and nut fastening piece is used for all trades and professions, it is the most widely used connection fastening piece in the machinery, require bolt and nut that anti-loosening measure is arranged in many use occasions, in order to avoid nut loosening causes security incident, the loosening measure of existing anti-bolt and nut can prevent that locking mechanism is loosening naturally, but can not prevent artificial dismounting.This provides possibility just for some lawless person's theft, destruction, and in China, the lawless person steals phenomenons such as railway, iron tower, communication, electrical equipment facility and happens occasionally, and has caused a large amount of losses to national wealth, and has caused many security incidents.For the destruction that avoids theft, some critical facility and some field of employment need antitheft bolt and nut and are fastenedly connected.

The purpose of this utility model provides the antitheft bolt and nut fastening connection piece that the anti-loosening function of non-return is arranged of a kind of energy, and it is connected firmly, and uses general purpose tool it can not be dismantled by manpower, and thief is had not yet found openings to exploit.

The purpose of this utility model is achieved in that

The anti-loosening bolt and nut fastening piece of a kind of antitheft non-return is made up of bolt, nut, pin key,

A. at the helical thread portion of bolt some axial and the corresponding cotter ways of pin key shape are arranged;

B. at the female thread portion of nut some axial and the strong corresponding cotter ways of shape of pin are arranged, tubaeform gap is arranged at this cotter way bottom;

C. a pin key is made with plastic material, and its cross section is a rectangle, there is the man type bifurcated its lower end, and its length is corresponding with nut thickness, and this pin key is by the cotter way that partly aligns with hammering stud bolt nut thread, after its bottom produced plastic deformation, its top was concordant with the nut upper-end surface.

In preferred embodiment, there is a vertical otch at middle part, the side of the man type bifurcated of described pin key lower end.

For the bolt and nut of stock size, the axial cotter way quantity of described bolt thread part is 2, and the quantity of the axial cotter way of described nut thread part is 3.

The following actively useful effect of the utility model:

1. be connected firmly, have anti-theft feature:

Squeeze into pin key in the cotter way at bolt and nut screw thread place with hammering when this bolt and nut fastening piece is installed, the pin key lower end produces plastic deformation, its man type bifurcated separately expands, snap in the horn mouth of nut cotter way lower end, pin key can not be return vertically again, reach non-return non-loosening purpose, and the pin key top is concordant with the nut upper-end surface, makes stealer with the dismounting of nut can not being circled round of general purpose tool and manpower.

2. carry-over moment is big, and change generally is threaded to screw thread and adds the pin key connection, thereby except that anti-theft feature, also is applicable to big being fastenedly connected of some transferring power.

3. easy for installation, it is prefabricated that this bolt and nut connects fastening piece, cotter way on the bolt and a cotter way of nut are aligned, because the cotter way reasonable quantity of bolt and nut, generally being no more than 60 degree corners can align, install easily, also available packing ring is adjusted the degree of registration of bolt and nut cotter way during use.

Now in conjunction with the accompanying drawings with preferred embodiment.

Fig. 1 is that the utility model connects fastening piece work schematic representation

Fig. 2 is each component part decomposing schematic representation among Fig. 1.

The anti-loosening bolt and nut fastening piece of antitheft non-return of the present utility model is made up of bolt 1, nut 2, pin strong 3 and is seen Fig. 1 Fig. 2.

At the helical thread portion of bolt 1 some axial and the corresponding cotter ways 4 of pin key 3 shapes are arranged;

At the female thread portion of nut 2 some axial and the strong corresponding cotter ways 5 of 3 shapes of pin are arranged; Tubaeform gap 6 is arranged at these cotter way 5 bottoms.

Every pair of bolt and nut fastening piece uses a pin key 3, described pin key 3 usefulness plastic materials are made, its cross section is a rectangle, there is man type bifurcated 7 its lower end, the thickness of its length and nut 2 is corresponding, this pin key 3 is by the cotter way that aligns with hammering stud bolt 1 nut 2 helical thread portions, and after its bottom produced plastic deformation, its top was concordant with nut 2 upper-end surfaces.

In preferred embodiment, there is a vertical otch 8 at middle part, the side of the man type bifurcated 7 of described pin key 3 lower ends.

Bolt and nut for stock size, the quantity of the axial cotter way 4 of described bolt 1 helical thread portion is 2, the quantity of the axial cotter way 5 of described nut 2 helical thread portions is 3, rotation angle when making 4,5 alignment of bolt and nut cotter way is no more than 60 degree, for larger-size bolt and nut, its cotter way number can be provided with more.

Bolt and nut of the present utility model and pin key are all made with metallic material.

Claims

1. the anti-loosening bolt and nut fastening piece of antitheft non-return is made up of bolt, nut, pin key, it is characterized in that:

C. a pin key is made with plastic material, and its cross section is a rectangle, there is the man type bifurcated its lower end, and its length is corresponding with nut thickness, this pin key by the cotter way that partly aligns with hammering stud bolt nut thread after, after its bottom produced plastic deformation, its top was concordant with the nut upper-end surface.

2. the anti-loosening bolt Luo of antitheft non-return according to claim 1 mother fastener is characterized in that: there is a vertical otch at the middle part, side of the man type bifurcated of described pin key lower end.

3. the anti-loosening bolt and nut fastening piece of antitheft non-return according to claim 1 is characterized in that: the axial cotter way quantity of described bolt thread part is 2, and the quantity of the axial cotter way of described nut thread part is 3.