CN201866044U - Theft-prevention screw and screwdriver - Google Patents

Abstract

The utility model discloses a theft-prevention screw which is provided with a screw rod with thread and a screw head; and the head of the screw is provided with a round counter bore, and an equilaterally triangular boss is arranged at the center of circle of the counter bore. The screwdriver for the theft-prevention screw is a round iron bar which is 'L'-shaped. One end of the round iron bar is long and the other end of the round iron bar is short, the diameter of the circle is just slightly smaller than that of the round counter bore at the head of the theft-prevention screw; and at the head of the iron bar, an equilaterally triangular counter table is arranged at the center of circle of the iron bar, and the size of the counter table is just slightly larger than that of the corresponding equilaterally triangular boss of the theft-prevention screw. The screwdriver with the external diameter can be just inserted into the round counter bore at the head of the theft-prevention screw, and when the edges and the angles of the two triangles coincide, the triangular counter table is just sheathed and fitted with the triangular boss on the screw; and as three sides of the triangle are stressed simultaneously, three moments with include angle of 120 degrees are formed, and the moments are utilized to screw in or out the screw.

Description

A kind of anti-theft screw and revolve tool

One, technical field

The utility model relates to the novel anti-theft instrument

Two, background technique

Improve the antitheft degree of screw, must use revolving tool and just can rotating anti-theft screw of special use; And rotation is not yielding easily.

Existing screw and revolve tool and have following defective:

1, revolves that the torsion of tool is big inadequately by 2, flat mouthful or plum blossom mouth easy deformation of screw

3, existing anti-theft screw and the corresponding tool that revolves crack easily

Three, summary of the invention

Solve the problem that prior art exists, and the moment of existing anti-theft screw is too small, improves the serviceability of anti-theft screw, anti-cracking, convenience.

To achieve these goals, the technical solution adopted in the utility model is as follows:

The utility model discloses a kind of anti-theft screw, threaded screw rod and screw head,

1, screw head has circular counterbore, in the center of circle of this counterbore, the boss of an equilateral triangle is arranged.A kind of tool that revolves that is used for described anti-theft screw is the iron rod of a circle; This iron rod is " L " a type.One head length, the other end is short, and this diameter of a circle is just smaller than the diameter of anti-theft screw head circular counter bore,

2, at the head of this iron rod, the circle centre position of iron rod circle has the heavy stand of an equilateral triangle, and the size of this heavy stand is just bigger with the leg-of-mutton boss of corresponding anti-theft screw;

3, this external diameter that revolves tool just can insert the circular counter bore of anti-theft screw head, when two triangle edges opposite side, when the diagonal angle, angle overlaps; Leg-of-mutton heavy stand, just with screw on the triangle boss fit; Rely on leg-of-mutton three faces simultaneously stressed, formed three moments that are mutually 120 °, rely on this moment to come precession or back-out screw.4 and the head of screw, there is a round platform to block around the triangle boss, because screw does not have straight groove box cross recess, general purpose tool can't rotary screw like this, if the instrument of use pliers and so on also can't be clamped leg-of-mutton boss, makes its rotation.

Thereby the instrument that can prevent general instrument and pliers and so on is the screw spin-up that screws, and in order to prevent random dismounting, is fit to the antitheft of the equipment of public place and parts; Such as Internet bar's computer housing, open-air equipment box, or the various cabinet that is exposed to the public place.Leg-of-mutton moment has improved torsion of the present utility model.Safeguard that for convenience the utility model is furnished with the special-purpose tool that revolves, can be easily and effectively with screw spin-up and fastening; Be convenient to the maintenance of equipment and device.

Four, description of drawings

Fig. 1 Fig. 2 is the structural representation of the utility model screw

Fig. 3 revolves the structural representation of tool for the utility model

Five, embodiment

Below in conjunction with accompanying drawing to the new anti-theft screw of this practicality and revolve tool and be further described: the utility model all adopts A3 steel or harder steel.This screw embodiment 1 sees that Figure 1A is this example, wherein the gap of Yuan Xing counterbore and equilateral triangle (1), the wherein boss of equilateral triangle (2).Fig. 2 circular counter bore (3).The circle centre position of circular counter bore (3) have one with its concentric equilateral triangle boss (2).In the taper of anti-theft screw head (4) is enclosed in circular counter bore (3) with its concentric equilateral triangle boss (2).

Originally revolve tool embodiment 2 and see that it is a circle that Fig. 3 wherein revolves tool, revolve tool external diameter (5), a leg-of-mutton hole (6) is arranged in the middle of the center of circle.The rotation mode that revolves tool for the center of circle be the center clockwise or be rotated counterclockwise.Screw and revolve embodiment with two kinds of interworkings:

1, sees that Fig. 2 circular counter bore (3) and Fig. 3 revolve tool external diameter (5); Revolve tool external diameter (5), more smaller than circular counter bore (3), (5) can insert (3), and both closely cooperate for they.

2, see the boss (2) and the leg-of-mutton hole of Fig. 3 (6) of Fig. 1 equilateral triangle; The boss of equilateral triangle (2) is more smaller than the leg-of-mutton hole of Fig. 3 (6), and when two triangles overlapped, the boss of equilateral triangle (6) inserted leg-of-mutton hole (2), and both closely cooperate for they; Just formed two triangles and overlapped, form three moments between their three faces, and direction has been identical, has formed three moments that are mutually 120 °.This moment just can screw or the spin-up screw.

Claims (2)

1. an anti-theft screw is characterized in that: the anti-theft screw head has circular counter bore (3), the circle centre position of circular counter bore have one with its concentric equilateral triangle boss (2), in the taper of anti-theft screw head (4) is enclosed in circular counter bore (3) with its concentric equilateral triangle boss (2).

An anti-theft screw revolve tool, it is characterized in that the described cross section that revolves tool is that circle is revolved tool external diameter (5), has a concentric with it leg-of-mutton hole (6) in the center of circle of circle.

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