CN2252909Y

CN2252909Y - Anti-theft nut

Info

Publication number: CN2252909Y
Application number: CN 96201873
Authority: CN
Inventors: 王勇; 张克生; 郭海青
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-01-12
Filing date: 1996-01-12
Publication date: 1997-04-23
Anticipated expiration: 2006-01-12

Abstract

The utility model relates to the technical field of an anti-theft nut on a screw bolt. The nut is characterized in that the nut is composed of a prismatic thread sleeve, a worm internal sleeve, etc., wherein, the outer part of the prismatic thread sleeve is prismatic; the middle part of the prismatic thread sleeve is a conical round hole; the worm internal sleeve is inserted into the conical round hole of the prismatic thread sleeve; the middle part of the thread internal sleeve is provided with female worm which is match with the worm of a screw bolt. The anti-theft nut is applicable to various large facilities fixed permanently, such as a bridge, a steel tower, a mine, petroleum machinery, a railway rail, sleeper fixing, a vehicle, etc. The utility model has the advantages of simple structure, simple machining, low cost, simple and convenient construction, favorable anti-theft performance, etc.

Description

Anti-theft nut

The utility model relates to a kind of anti-theft nut technical field on the bolt.

Existing plain bolt is non-anti-theft, is easy to from bolt plain nut be laid down with spanner, just its equipment is removed subsequently, and is annual non-anti-theft because of bolt, makes the go to pot loss of several hundred million approximately units of various public facilitieies.Invented a kind of anti-theft bolt in recent years, it is perforate on screw head, and bolt tightens up the back with in the pin hand-hole with nut, though this method plays certain antitheft effect, bolt cost height, difficulty of processing is big, it is fixed as permanent fixing, and dismounting can only be cut off with cutting machine.

The purpose of this utility model is a kind of anti-theft nut that is used on the bolt of design, and it has simple in structure, and cost is low, and difficulty of processing is big, easy construction, and dismounting does not only need cutting machine just can realize with special tool, advantages such as theftproof performance excellence.

The feature of this nut is made up of parts such as covers in prismatic swivel nut and the screw thread.The outside of prismatic swivel nut is a prismatic, and the middle part is the taper circular hole, and cover is inserted in the taper circular hole in the screw thread.The profile of cover is identical with the taper circular hole in the screw thread, and for being with the cylindrical of tapering, the cover middle part is provided with the internal thread that is complementary with screw flight in the screw thread.The profile of prismatic swivel nut can be made as six prismatics, four prismatics, perhaps is many prismatics.Anti-theft nut can be enclosed within on the screw rod separately and use, and also can use together all with existing plain nut and can play antitheft effect.

During use, cover in the screw thread is inserted in the prismatic swivel nut, form with extruding is fixed on the outer surface that overlaps in the screw thread on the inwall of prismatic swivel nut tightly, again this nut is pressed major part outwardly, microcephaly's direction inwardly is set on the bolt, overlap in the screw thread this moment and on screw rod, rotate with the prismatic swivel nut, when cover and fastening piece are close in the screw thread, continue to pull the prismatic swivel nut, when power reached about 15～25 kilograms, then cover and prismatic swivel nut came off voluntarily in the screw thread, and cover just tightens up fastening piece firmly in the screw thread, but prismatic swivel nut spanner left-right rotation, but cover in the screw thread can't be unloaded.The same like plain nut stripped thread on screw rod, thus can effectively protect its facility not dismantled privately or destroy.

This anti-theft nut is applicable on the various facilities large-scale, permanent fixation, and on the facilities such as fixing, vehicle as bridge, iron tower, mining machinery, petroleum machinery, rail and sleeper, it has simple in structure, processing easily, cost is low, easy construction, advantage such as theftproof performance is good.

Fig. 1 is the utility model master TV structure schematic representation.

Fig. 2 is the left TV structure schematic representation of Fig. 1.

Fig. 3 is enclosed within schematic representation on the bolt for anti-theft nut.

Cover among Fig. 1, Fig. 2, Fig. 31, in the screw thread; 2, prismatic overcoat; 3, screw rod; 4, hold-doun nut; 5, plain nut.Screw rod (3) be provided with screw thread in the outside thread that is complementary of internal thread of cover (1).

Claims

1, a kind of anti-theft nut, it is characterized in that it is made up of parts such as covers in prismatic swivel nut and the screw thread, prismatic swivel nut outside is a prismatic, and the middle part is the taper circular hole, cover is inserted in the taper circular hole of prismatic swivel nut in the screw thread, and the cover middle part is provided with the internal thread that is complementary with screw flight in the screw thread.