CN2233484Y

CN2233484Y - Theft-proof conical fastener and its special sleeve

Info

Publication number: CN2233484Y
Application number: CN 95227347
Authority: CN
Inventors: 沈伦泰; 何志方
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-24
Filing date: 1995-11-24
Publication date: 1996-08-21
Anticipated expiration: 2005-11-24

Abstract

The utility model discloses an anti-theft conical fastener and a special sleeve thereof. The utility model is especially suitable to be used as fasteners for departments, such as a power circuit department, a railway department, a traffic department, a communication department, etc. The utility model can only be disassembled and assembled by a special sleeve. The head shapes of a screw nut and a screw bolt are the round table bodies with the same conicity, and two and more than two notches formed by crossing arc faces and vertical faces are arranged on the outer surface. The inner wall at the lower end of the special sleeve is provided with two and more than two notches formed by crossing arc faces and vertical surfaces matching with the screw nut and the screw bolt. Because the fastener is provided with notches, the locking force is increased, the anti-theft performance is good and the fastener is uneasy to be beaten away. The utility model is wrenched by the special sleeve and has the advantages of convenient use, low labour consumption and high safety and reliability.

Description

Taper anti-theft fastening piece and socket wrench specially adapted for it

The utility model relates to a kind of special shape, off-gauge fastening piece, and departments such as suitable especially power circuit, railway, traffic, communication use as fastening piece, and need taper anti-theft fastening piece and socket wrench specially adapted for it with the dismounting of socket wrench specially adapted for it ability.

Loosening phenomenon will take place with long back one or more fasteners in a lot of outdoor installation times in the power circuit system, and the thief seizes the opportunity the theft electric power facility and causes great loss for national wealth, people's life safety.

Patent No. 95202117.X " Eight Diagrams type anti-theft screw " provide a kind of folk prescription to stressed, the anti-theft screw that easily screws, though structure also has skidding when simply screwing, theftproof performance is good not enough.

The purpose of this utility model is to provide a kind of and needs with special-purpose assorted instrument ability dismounting, and fastening effect is good, taper anti-theft fastening piece and socket wrench specially adapted for it that theftproof performance is good.

The utility model is achieved in that taper anti-theft fastening piece and socket wrench specially adapted for it, and the nose shape of its nut, bolt is the Rotary-table of identical tapering, has on the outer surface to intersect the breach that forms by arc shaped surface and vertical surface more than two and two.Intersect the breach that forms and have on the lower end inwall of socket wrench specially adapted for it by the arc shaped surface more than two and two and vertical surface with nut, bolt are complementary.

Fig. 1. the bolt arrangement schematic representation.

Fig. 2. the plan view of Fig. 1.

Fig. 3. the nut structure schematic representation.

Fig. 4. the plan view of Fig. 3.

Fig. 5. the tube-in-tube structure schematic representation.

Fig. 6. the A-A view of Fig. 5.

Fig. 7. the enlarged view of Fig. 4.

Below in conjunction with accompanying drawing embodiment of the present utility model is further described.

Bolt (3) head is the Rotary-table that identical tapering is arranged with nut (5), and its outer surface has five uniform breach.

In ° scope of 0-20～22, two vertical surfaces (1) that promptly form by AB, BC between B, C.In 50～52-72 ° of later scope of E point is Rotary-table surface (2).

CE, CD are that two sections radiuses are identical, the arc that the center of circle is different, and angle is 4～5 ° between D, E, in ° scope of 0-50～52 is to intersect the breach that forms by BC vertical surface (1) and CDE arc shaped surface (4) between A, E.Cut height is 4/5～5/6 of bolt (3) head, nut (a 5) height.

By that analogy in 72-92～94 °, 144-164～166 °, 216-236～238 ° are vertical surface (1) in ° scope of 288-308～310.72-122～124 °, 144-194～196 °, 216-266～268 °, 288-338～340 ° are the breach scope.122～124-144 °, 194～196-216 °, 266～268-288 ° is Rotary-table surface (2) in the 338～340-360 ° of scope.

Also can be with Rotary-table nut (5), bolt (3) head outer surface makes three uniform breach or seven breach specifically do not describe in detail.

Sleeve (6) is The shape cylindrical body has screw on one arm, and five breach that are complementary with nut (5), bolt (3) nose shape are arranged on the inwall of cylinder lower end, and cylinder edge is the conical surface (7).

During use, long handle is screwed in the screw on sleeve (6), socket wrench specially adapted for it (6) is enclosed within the head of nut (5) or bolt (3) again, the long handle of pulling sleeve (6) just can screw or loose removing nut or bolt.

The utility model is compared with prior art: consist of because it has to be intersected by vertical plane and arcwall face Breach, so coupling mechanism force is strong, theftproof performance is good, and also be difficult for chiseling with chisel. Easy to use, cover Also very laborsaving when tube is pulled, use safety, reliable.

Claims

1. taper anti-theft fastening piece, the nose shape of its nut, bolt is the Rotary-table of identical tapering, it is characterized in that having on the outer surface of nut (5), bolt (3) head intersecting the breach that forms by arc shaped surface (4) and vertical surface (1) more than two and two.

2. fastening piece according to claim 1, it is characterized in that on the outer surface of bolt (3) head and nut (5) head five uniform breach being arranged, in ° scope of 0-20～22 by AB, two vertical surfaces (1) that BC forms, in 50～52-72 ° of scope Rotary-table surface (2), CD, CE is that two sections radiuses are identical, the arc that the center of circle is different, D, angle is 4～5 ° between E, in ° scope of 0-50～52, intersect the breach that forms by BC vertical surface (1) and CDE arc shaped surface (4), cut height is bolt (a 3) head, 4/5～5/6 of nut (5) height, in 72-92～94 °, 144-164～166 °, 216-236～238 °, in ° scope of 288-308～310 is vertical surface (1), 122～124-144 °, and 194～196-216 °, 266～268-288 ° is Rotary-table surface (2) in the 338～340-360 ° of scope.72-122～124 °, 144-194～196 °, 216-266～268 °, 288-338～340 ° are the breach scope.

3. fastening piece according to claim 1 is characterized in that on the outer surface of nut (5), bolt (3) head three uniform breach or seven breach being arranged.

4. a socket wrench specially adapted for it is made up of sleeve, it is characterized in that sleeve (6) is

The shape cylindrical body has screw on one arm, have on the inwall of cylinder lower end with nut (5), bolt (3) nose shape be complementary by the crossing breach that forms of the arc shaped surface more than two and two (4) and vertical surface (1).

5. socket wrench specially adapted for it according to claim 4, five breach that it is characterized in that having on the inwall of sleeve (6) lower end the nose shape with nut (5) or bolt (3) to be complementary, cylinder edge is the conical surface (7).