CN2106259U

CN2106259U - Staggered-tooth theft-proof bolt and special-purpose tool

Info

Publication number: CN2106259U
Application number: CN 90216568
Authority: CN
Inventors: 欧其和
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-07-19
Filing date: 1990-07-19
Publication date: 1992-06-03

Abstract

The utility model discloses a staggered-tooth theft-proof bolt and special-purpose tool thereof. The theft-proof bolt comprises a screw rod [1], a clamp nut [2], and an anti-theft nut [3]. The contact surfaces of the clamp nut [2] and the anti-theft nut [3] are respectively provided with uniformly-distributed and mutually-matched backward tooth. When the two nuts are under the state of impaction, the backward tooth on the contact surfaces occludes and the tooth-way is staggered, which makes the two nuts be unable to rotate relatively or rotate jointly, and thus the anti-theft function is provided. The outline of the anti-theft nut [3] is conical, which can not be exerted force by a conventional tool, and the reliability of anti-theft is even more enhanced.

Description

Staggered-tooth theft-proof bolt and special-purpose tool

The utility model relates to a kind of fastening piece, particularly a kind of bolt.

At present, bolt is widely used on various kinds of equipment, the building, and for convenience the maintenance of equipment and building is more easily opened these bolts by conventional instrument, yet the material of equipment building is also often easily opened stolenly because of bolt, causes the heavy losses of country.

In order to overcome this shortcoming of above-mentioned bolt, the utility model provides a kind of staggered-tooth anti-theft bolt that is difficult to open after fastening.

The utility model comprises screw rod, tightening nut, anti-theft nut and supporting with it special tool thereof, it is characterized in that: the pawl that even distribution is respectively arranged on the surface of contact of tightening nut and anti-theft nut and mate mutually, the bevel direction of the pawl on the anti-theft nut is consistent with its direction of tightening, during use, tighten tightening nut earlier, twist anti-theft nut then, extrusion-deformation takes place in metal under the effect of moment of torsion, the inclined-plane of surface of contact is relatively moved, it is locked to fall into the tooth bank when surpassing the other side's tooth top separately, and two nuts can not be relatively rotated; And when two nuts were in impaction state, the silk tooth joint of two nuts was not just in time to connect together, but certain dislocation is arranged, and promptly the tooth road staggers, and this is equivalent to middle not the planning a successor of silk tooth of a nut, thereby two nuts can not be as a unitary rotation.The combination of these two features can be finished task of the present utility model.The bolt if start discharging, as long as the pawl that utilizes moment of torsion to destroy on the nut surface of contact can be started discharging, the anti-theft nut after starting discharging promptly cancels.In order further to increase antitheft reliability, the profile of anti-theft nut can be done coning, surface can evenly distribute some grooves or hole make existing conventional spanner or pliers to put forth effort.

Special tool of the present utility model is a kind of unconventional spanner or pliers, the surface of contact that it is characterized in that its interlock anti-theft nut is a taper shape that is complementary with the anti-theft nut profile, can have on its surface of contact with the anti-theft nut profile on groove or the tooth that is complementary of hole, as anti-theft nut is conical band groove, and then special tool is female cone (funnel form) band double wedge etc.The using method of this special tool is the same with the using method of conventional spanner or pliers.

Because the pawl that even distribution is respectively arranged and be complementary on the surface of contact of tightening nut of the present utility model and anti-theft nut, when two nuts compress when being touched the face pawl and pinning mutually, two nuts can not relatively rotate; Simultaneously, the silk tooth joint of two nuts is not just in time to connect together, but certain dislocation is arranged, and causes two nuts can not be as a unitary rotation.The combination of these two features makes bolt of the present utility model once tightening, and promptly has anti-theft feature, and the anti-theft nut profile does coning, and conventional instrument can't be puted forth effort, and has more increased antitheft reliability.

Introduce a routine embodiment below in conjunction with accompanying drawing.

Fig. 1 is the utility model embodiment's a schematic representation.

Fig. 2 and Fig. 3 are the schematic representation of anti-theft nut in the utility model example.

Fig. 4 is the schematic representation of the utility model special tool.

Shown in Fig. 1 and 2,3, present embodiment is made up of screw rod 1, tightening nut 2 and anti-theft nut 3, tightening nut 2 respectively has even distribution and the mutual pawl that mates with the surface of contact of anti-theft nut 3, the bevel direction of tightening nut 2 upper inverted tooths is counterclockwise, the bevel direction of the pawl on the anti-theft nut 3 is a clockwise direction, the appearance of tightening nut 3 is conical, and the surface evenly has three square grooves.During use, tighten tightening nut 2 earlier, twist anti-theft nut 3 again, metal moment of torsion effect under extrusion-deformation takes place, the inclined-plane that connects on the surface of contact relatively moves, and when surpassing tooth top, falls into the tooth bank mutually and is lockable, make two nuts not relatively rotate, simultaneously, the silk tooth joint of two nuts is not just in time continuous, but misplaces, make two nuts can not be, thereby have antitheft function as a unitary rotation.Simultaneously, the appearance of anti-theft nut 3 is conical, and conventional instruments such as spanner can't be puted forth effort, and have more increased antitheft reliability.

Fig. 4 is a special tool of the present utility model, and wherein an end 4 is the inner conical (funnel form) that the profile with the described anti-theft nut 3 of embodiment is complementary.The square tooth 5 that has three three grooves on the profile with above-mentioned anti-theft nut 3 to be complementary on the surface, its using method is the same with conventional spanner.When opening bolt, then be that the surface of contact of bad two nuts of breaking is realized.

Claims

1, a kind of by screw rod [1], the anti-theft bolt that nut is formed, it is characterized in that: described nut comprises tightening nut [2] and anti-theft nut [3], the pawl that even distribution is respectively arranged on the surface of contact of tightening nut [2] and anti-theft nut [3] and mate mutually, the bevel direction of the pawl of anti-theft nut [3] is consistent with its direction of tightening, the profile of anti-theft nut [3] can be conical, and its surface can have groove or hole.

2, a kind of special tool that is used for the described anti-theft bolt locking of claim 1 or opens, it is characterized in that: the surface of contact of described special tool one end ［ 4 ］ interlock anti-theft nut ［ 3 ］ is a taper shape that is complementary with anti-theft nut ［ 3 ］ profile, can have on its surface of contact with anti-theft nut ［ 3 ］ profile on groove or the tooth ［ 5 ］ that is complementary of hole.