CN2396227Y

CN2396227Y - Anti-theft locknut

Info

Publication number: CN2396227Y
Application number: CN 99234840
Authority: CN
Inventors: 王庆安
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-05
Filing date: 1999-08-05
Publication date: 2000-09-13
Anticipated expiration: 2009-08-05

Abstract

The utility model relates to an anti-loose antitheft nut, which comprises a front internal ring and a rear internal ring with internal screws, wherein, the front internal ring is provided with a non-return step. The external sides of the front and the rear internal rings are sheathed with a hexagon external ring which corresponds to the shapes of the external sides. The external ring and the front and the rear internal rings are consolidated to be integration through an adhesive layer. When screwing force is increased, when the screwing force reaches shear resistance of the adhesive layer, the external ring and the front and the rear internal rings can successively slip and disengage. An axial positioning step is arranged between the internal ring and the external ring, and the external ring can not exit. The anti-loose antitheft nut can be directly used as the regular nut without being additionally provided with any accessory. The anti-loose antitheft nut can be tightened only through adopting a normal method, and anti-loose and anti-theft functions can be completed at one time.

Description

Anti-loose anti-theft nut

The utility model relates to locking, the theft-prevention structure of scyewed joint.

A large amount of metal constructions with scyewed joint owing to reasons such as varying load or vibrations, often lose self-locking action, take place loosening.More there is lawless people deliberately to unscrew nut, the theft metal construction.Many metal constructions all are to be combined as a whole by bolt, nut by angle steel, shaped steel in the communal facility.This class worm structure is easy to the wrench dismounting, thereby very easily stolen.Annual China causes heavy economic losses and security incident because of this class theft.Usually in order to prevent nut loosening, can use two nuts simultaneously on bolt, the back of the body is tight mutually.Even be totally released with connected piece like this, still have active force to exist between nut, reduced the possibility that gets loose.But this kind connecting structure has only locking effect, there is no antitheft effect.More existing lock nuts all must install annexes such as pin additional on original coupling, nut and bolt or body are combined as a whole, and use very inconvenient.All be to rely on workman's experience and feel to screw bolt in addition in general machine assembling with common wrench.The power that screws during assembling is actual to be dissimilar.If revolve tension, especially to stove bolt, lead to grave consequences sometimes.

The purpose of this utility model is the above-mentioned difficulties that will overcome prior art, and a kind of anti-loose anti-theft nut that uses fully according to a conventional method is provided, and does not need any annex, can once finish two kinds of effects of anti-loose anti-theft with spanner.And the power that screws of nut can accurately be controlled.

Solution of the present utility model is: this nut comprises a tapped inner ring, and the periphery of inner ring is provided with the retaining step; The cylindrical side of inner ring is with the six side outer rings that adapt of shape with it; Fixed by glue-line between outer ring and the inner ring is one.

Above-mentioned anti-loose anti-theft nut can be provided with a locking back lasso with identical internal thread in the rear end of inner ring, and fixed by glue-line and outer ring be one.。

The diameter of described locking back lasso can be slightly larger than inner ring.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing.

Fig. 1 is the user mode sectional arrangement drawing of a kind of structure of the utility model.

Fig. 2 is the user mode sectional arrangement drawing of the another kind of structure of the utility model.

Referring to Fig. 1, this nut 1 comprises tapped inner ring 2 and outer ring 3.Inner ring 2 is equivalent to round nut, can screw in the nut 7.The periphery of inner ring 2 is provided with cylindrical retaining step 6, matches with the stepped shape endoporus of outer ring 3, and outer ring 3 can not be taken out vertically.Be bonded as one by powerful metal-to-metal adhesive between inner ring 2 and the outer ring 3.Glue-line 5 has a certain size shearing strength therebetween.The outer-hexagonal shape that outer ring 3 has plain nut is used for spanner.

Referring to Fig. 2, in order when screwing nut, to have locking effect, a locking back lasso 4 with identical internal thread is set in the rear end of inner ring 2, and fixed by glue-line 5 and outer ring 3 be one.The periphery of back lasso 4 is the cylndrical surface among the figure.The diameter of back lasso 4 should be slightly larger than inner ring 2, to increase shearing strength, it can be screwed in bigger power, and two nut back ofs the body are tight.

With Fig. 2 is example, and along with nut 1 screws in, inner ring 2 at first contacts coupled 8 during work, when the power of screwing reaches the shearing strength of glue-line between outer ring 3 and the inner ring 2, and the disengaging of skidding of outer ring 3 and inner ring 2.Be rotated further outer ring 3, back lasso 4 is compressed with inner ring 2.Along with moment of torsion further strengthens, outer ring 3 again with back lasso 4 disengaging of skidding.This moment, nut reached predetermined impacting force and the tight power of the back of the body between double nut, thereby played locking effect.At this moment the outer ring of nut and inner ring can freely skid, and use the spanner outer ring of can only dallying, and can't unscrew the nut inner ring.Owing between the inside and outside circle axially locating step is arranged, outer ring 4 can't be withdrawed from, thereby has antitheft effect simultaneously.

Compare with existing anti-loose anti-theft nut, the utility model can directly make as plain nut With, need not to install additional any annex. Jack panel need only be gone up according to a conventional method, anti-loose anti-theft can be once finished Effect. Because the shearing strength of glue-line is certain, the power that screws of this nut can accurately be controlled, thereby Guarantee each nut screw power or service load is identical.

Claims

1, anti-loose anti-theft nut is characterized in that this nut comprises a tapped inner ring (2), and the periphery of inner ring (2) is provided with retaining step (6); The cylindrical side of inner ring (2) is with the six side outer rings (3) that adapt of shape with it; Fixed by glue-line (5) between outer ring (3) and the inner ring (2) is one.

2, anti-loose anti-theft nut as claimed in claim 1, the rear end that it is characterized in that said inner ring (2) are provided with the locking back lasso (4) with identical internal thread, and fixed by glue-line (5) and outer ring (3) be one.。

3, anti-loose anti-theft nut as claimed in claim 2, the slightly larger in diameter that it is characterized in that said locking back lasso (4) is in inner ring (2).