CN201232698Y

CN201232698Y - Anti-theft fastener

Info

Publication number: CN201232698Y
Application number: CNU2008201213217U
Authority: CN
Inventors: 叶仁富; 徐阳生
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-14
Filing date: 2008-07-14
Publication date: 2009-05-06
Anticipated expiration: 2018-07-14

Abstract

The utility model discloses an anti-theft fastening piece which comprises a bolt and a screw cap body; the inner hole of the screw cap body is provided with an inner thread which is matched with the outer thread of the bolt; the anti-theft fastening piece is characterized in that the a plurality of projections are arranged on the side walls of a plurality of screw teeth near the outer end surface of the inner thread of the screw cap body; the projections are arranged in a pitch in interval. In the utility model, after the projections are arranged on the side walls of a plurality of screw teeth at the outermost end surface of the inner thread of the screw cap body, the partial pitch turns to be narrow; when the screw teeth of the outer thread of the bolt are screwed into the inner thread with the partially narrow pitch under the effect of a tool, the projections are tightly engaged with the screw teeth of the outer thread to lead the screw cap body and the bolt to be more tightly connected in a rotating way than the fastening piece with a common structure; therefore, when unscrewing, if the screw cap body is independently screwed, the bolt can rotate with the screw cap body and vice versa, thereby having the function of anti-theft. The fastening piece realizes the goals of less special tools and related parts, simple structure and low manufacture cost for loosening and fastening.

Description

Anti-theft fastening piece

[technical field]

The utility model belongs to a kind of fastening piece of being made up of nut and bolt, relates in particular to a kind of anti-theft fastening piece that needs special tool just can loosen, tighten.

[background technique]

The fastening piece that is made of nut and bolt has been widely used in different occasions, and for some special occasions, has an antitheft problem toward contact.At present, in public technology, the employing profile tool loosens, tighten bolt and nut is more stylish way on antitheft, can effectively stop the incident of utilizing general purpose tool to commit a crime to take place really.The patent No. is 200510060470.8 a kind of " moveable ring type anti-theft screw cap ", it comprises the nut body of a band inner bolt hole, this nut body is a cylindrical body, at least be provided with an annular groove on the outer wall, be equipped with a steel ring that can trackslip in the groove, described annular groove is the semicircle annular groove, and the steel ring that is nested with has at least 1/3rd to expose to annular groove, also offers four depression circular cone hole slots on the nut body outer wall.Though this anti-theft screw cap has realized loosening, tighten the purpose that must use special tool well, because relate to that parts are many, complex structure and manufacture cost height, influenced and applied.

[summary of the invention]

For solving the problems referred to above that prior art exists, the utility model aims to provide the novel anti-theft fastening piece of a kind of structure, this fastening piece not only can realize adopting the purpose of special tool degree of tightness fastening piece, and has the advantages that to relate to few, the simple in structure and low cost of manufacture of parts.

For achieving the above object, the utility model has adopted following technological scheme, this anti-theft fastening piece is made up of bolt and nut body two-part, has the internal thread that is complementary with the bolt outside thread in the nut body endoporus, it is characterized in that: the nut body internal thread has a plurality of projections near on several the thread sidewalls of exterior edge face, and projection is interruption-like protruding in the spiral shell square.

It is conical that aforesaid anti-theft fastening piece, bolt tail and nut body all are, and has the draw-in groove of using for degree of tightness on both external annulus.

Aforesaid anti-theft fastening piece, bolt tail is truncated cone, has many grooves that axially are provided with on the external annulus of truncated cone.

Aforesaid anti-theft fastening piece, nut body is truncated cone, has many grooves that axially are provided with on the external annulus of truncated cone.

Aforesaid anti-theft fastening piece, internal thread thread are the triangle thread, have the projection of the interruption-like distribution that makes the stenosis of local spiral shell square on the spiral shell square sidewall of triangle thread.

Beneficial effect, the utility model is by after being provided with projection on outermost several the thread sidewalls of nut body internal thread, make the stenosis of local spiral shell square, when the externally threaded thread of bolt behind the internal thread of the local spiral shell square of precession under instrumental purpose stenosis, projection is killed the outside thread thread tightly, nut body more closely is screwed in the fastening piece of bolt than general structure, therefore, when unscrewing, if independent turn nut body, bolt will rotate thereupon, thereby has played anti-theft effect.

[description of drawings]

Fig. 1 is an embodiment's of the utility model a broken section perspective view.

Fig. 2 is the structure for amplifying schematic representation of nut body among Fig. 1.

Sequence number is represented respectively among the figure: bolt 1, outside thread 12, bolt tail 13, axial notch 14, nut body 2, axial notch 21, exterior edge face 22, spiral shell square 23, projection 24.

[embodiment]

Referring to Fig. 1, and in conjunction with Fig. 2.Whole fastening piece is made up of bolt 1 and nut 2 two-part splits, and bolt tail 13 is circular cone shape, and certainly, the shape of bolt tail 13 can be decided as required, can not degree of tightness as long as can reach general purpose tool.Have many axial notches 14 on the external annulus of circular cone shape bolt tail 13, the purpose that axial notch 14 is set is for the usefulness of the instrument application of force, based on such consideration, also axial notch 14 can be deformed into other structure, as counterbore, deep gouge etc.The outside thread 12 of bolt 1 is complementary with the internal thread of nut body 2.

The profile of nut body 2 can be consistent with the shape of bolt tail 13, and under the situation of unanimity, special tool just can be identical, therefore, many axial notches 21 arranged also on its external annulus.Referring to Fig. 2, key point of the present utility model is: the internal thread at nut body 2 has a plurality of projections 24 near on several the thread sidewalls of exterior edge face 22, and projection 24 is interruption-like protruding in spiral shell square 23.The purpose that projection 24 is set is to dwindle spiral shell square 23, rely on the reinforcing of external force when the outside thread 12 of bolt 1 front end, after making the spiral shell square 23 that the thread precession dwindled, projection 24 is killed the outside thread thread tightly, and nut body 2 more closely is screwed in the fastening piece of bolt 1 than general structure, therefore, when unscrewing, if independent turn nut body 2, bolt 1 will rotate thereupon, vice versa, thereby played anti-theft effect.

During actual fabrication, thread sidewall projection 24 can get final product by extrude breach at the thread top, and the breach wall is expanded downwards, and dilation is protruding in the spiral shell square of both sides, dwindles the spiral shell square.

Claims

1, a kind of anti-theft fastening piece, form by bolt (1) and nut body (2) two-part, has the internal thread that is complementary with bolt (1) outside thread (12) in nut body (2) endoporus, it is characterized in that: nut body (2) internal thread has a plurality of projections (24) near on several the thread sidewalls of exterior edge face (22), and projection (24) is interruption-like protruding in spiral shell square (23).

2, anti-theft fastening piece as claimed in claim 1 is characterized in that: the shape of bolt tail (13) and nut body (2) all is conical, has the draw-in groove of using for degree of tightness on both external annulus.

3, anti-theft fastening piece as claimed in claim 1 or 2 is characterized in that: bolt tail (13) is truncated cone, has many grooves (14) that axially are provided with on the external annulus of truncated cone.

4, anti-theft fastening piece as claimed in claim 1 or 2 is characterized in that: nut body (2) is truncated cone, has many grooves (21) that axially are provided with on the external annulus of truncated cone.

5, anti-theft fastening piece as claimed in claim 1 is characterized in that: the internal thread thread is the triangle thread, has the projection of the interruption-like distribution that makes the stenosis of local spiral shell square on the spiral shell square sidewall of triangle thread.