CN201306361Y

CN201306361Y - Anti-theft nut

Info

Publication number: CN201306361Y
Application number: CNU2008202231157U
Authority: CN
Inventors: 张静
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-04
Filing date: 2008-12-04
Publication date: 2009-09-09
Anticipated expiration: 2018-12-04

Abstract

The utility model discloses an anti-theft nut. Helical threads (4) are arranged in the nut (1); the periphery of the nut (1) is in a smooth circular shape; a hollow cylinder (2) is arranged in the center of the nut (1); a solid cylinder in the nut (1), with one part thereof removed, forms a step; the threads (4) are positioned in the part (3) not removed; and the removed part is projected on the bottom surface of the nut to form a pentagram. Because of overcoming the defects of anti-theft incapability in the existing nuts (1), the anti-theft nut with simple structure, convenient production, repeated use and low cost can prevent the thieves screwing off the nuts (1) to steal articles, and can be widely used in the daily life.

Description

A kind of anti-theft nut

Technical field

The utility model relates to a kind of nut of special shape, is specifically related to the nut that relies on shape antitheft.

Background technique

Usually use screw bolt and nut fixed object and article at present.Especially on highway facilities, electric power facility a large amount of use screw bolt and nut draw label, crash bar, transformer fixed.The advantage of using bolt, nut to fix is to use conveniently, needs only by instruments such as common spanner or pliers, nut is tightened on the bolt get final product.But the robber pulls down existing orthohexagonal nut rotation easily with common wrench or pliers, thereby steals equipment.

The model utility content

The utility model has overcome the deficiencies in the prior art, provides to rely on special nut shape to carry out antitheft.

For solving above-mentioned technical problem, the utility model by the following technical solutions:

A kind of anti-theft nut is the screw thread 4 of spiral in the nut 1.Nut 1 periphery is smooth circle, and central authorities are hollow cylinder 2, and solid cylinder is cut out a part and forms a step in the nut 1, and screw thread 4 is in the part 3 that is not cut out, and the part that is cut out projects into the five-pointed star shape on the bottom surface of nut.

Further technological scheme is that five-pointed star is positive five-pointed star.

Further technological scheme be screw thread 4 when being the clockwise direction swivel nut 1 nut 1 retreat, counterclockwise nut 1 advances during swivel nut 1.

Further 2/3rds of maximum diameter≤nut 1 diameter of the part that cut out of technological scheme, 4/3rds of 〉=hollow cylinder 2 diameters.

Further technological scheme is that the height of the height of solid cylinder cutouts and the part 3 that do not cut out equates.

Further technological scheme is that the height of solid cylinder cutouts is half of height of the part 3 that do not cut out.

Compared with prior art, the beneficial effects of the utility model are simple in structure, and are convenient for production, can reuse, and cost is low, can prevent that the robber from screwing off nut and stealing article.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is that the A-A ' of Fig. 1 is to sectional view.

Embodiment

Below in conjunction with accompanying drawing the utility model is further elaborated.

Shown in 1,2, a kind of anti-theft nut is the screw thread 4 of spiral in the nut 1.Nut 1 periphery is smooth circle, and central authorities are hollow cylinder 2, and solid cylinder is cut out a part and forms a step in the nut 1, and screw thread 4 is in the part 3 that is not cut out, and the part that is cut out projects into positive five-pointed star shape on the bottom surface of nut.The maximum diameter of the part that cuts out equals 2/3rds of nut 1 diameter, is 4/3rds of hollow cylinder 2 diameters.1 nut 1 retreated when screw thread 4 was the clockwise direction swivel nut, and nut 1 advances during counter clockwise direction swivel nut 1.The height of the height of solid cylinder cutouts and the part 3 that do not cut out equates.

During use, the utility model is placed on the bolt, it is outside wherein to be cut out a part of one side by interior solid cylinder, is enclosed within the hollow parts that is cut out with special-purpose instrument.The professional tool center is a circular hole, can pass bolt, and it is peripheral the same with the partial shape that is cut out, and professional tool and nut 1 coincide.Counterclockwise rotate professional tool drive nut 1 and be rotated counterclockwise, article are fixed.When the robber steals, because nut 1 periphery is smooth circle, can't rotating nut 1 with common spanner or this pliers, nut 1 can't be disassembled.Simultaneously because general nut 1 counterclockwise swivel nut 1 retreat, if can take swivel nut 1 counterclockwise during the powerful swivel nut 1 of robber, it is tight more that the result can cause nut 1 to rotate more, and reach antitheft purpose.When as needs article being disassembled, the instrument of special use is enclosed within the hollow parts that is cut out, clockwise direction rotation professional tool drives nut 1 and turns clockwise, and nut 1 rotates from bolt, takes off article.

Claims

1, a kind of anti-theft nut, it in the nut (1) screw thread (4) of spiral, it is characterized in that nut (1) periphery is smooth circle, central authorities are hollow cylinder (2), the interior solid cylinder of nut (1) is cut out a part and is formed a step, screw thread (4) is in the part that is not cut out (3), is projected into the five-pointed star shape by the part that cut out on the bottom surface of nut.

2, anti-theft nut according to claim 1 is characterized in that described five-pointed star is positive five-pointed star.

3, anti-theft nut according to claim 2, (1) nut (1) retreats when it is characterized in that described screw thread (4) is the clockwise direction swivel nut, and counterclockwise nut (1) advances during swivel nut (1).

4, anti-theft nut according to claim 3, it is characterized in that the described part that is cut out maximum diameter≤nut (1) diameter 2/3rds, 4/3rds of 〉=hollow cylinder (2) diameter.

5, anti-theft nut according to claim 4, the height of the part that it is characterized in that the height of described solid cylinder cutouts and do not cut out (3) equates.

6, anti-theft nut according to claim 4, the height that it is characterized in that described solid cylinder cutouts are half of height of the part (3) that do not cut out.