CN201176997Y

CN201176997Y - Unidirectional fastening screw

Info

Publication number: CN201176997Y
Application number: CNU2008200465668U
Authority: CN
Inventors: 孙正良
Original assignee: GUANGZHOU DING'AN TRAFFIC TECHNOLOGY Co Ltd
Current assignee: GUANGZHOU DING'AN TRAFFIC TECHNOLOGY Co Ltd
Priority date: 2008-04-18
Filing date: 2008-04-18
Publication date: 2009-01-07
Anticipated expiration: 2018-04-18

Abstract

The utility model relates to a unidirectional fastening bolt, which comprises a threaded section and a head part, wherein the end face of the head part is provided with two positioning clamping blocks which are convex and can position a body to rotate clockwise; and the two positioning clamping blocks are centrally symmetrical with each other and respectively provided with rotating and positioning edges which are parallel to each other but not opposite to each other, and curved surfaces which are transited to the end face. The unidirectional fastening bolt realizes the aim that the unidirectional fastening bolt can only be screwed up clockwise in the forward direction and can not be screwed off in the reverse direction.

Description

Unidirectional fastening screw trip bolt

Technical field

The utility model relates to screw, particularly unidirectional fastening screw trip bolt.

Background technique

It is the symmetrical locating bump of symmetrical line with the center line that the head end of traditional round head bolt has a pair of, the gulde edge of locating bump forms parallel and relative in-line locating slot, Flathead screwdriver insert just can drive in this locating slot screw body just changeing clockwise tighten and counterclockwise counter-rotating unscrew.Usually adopt common screw link to be fixed on the car plate pallet as the car plate on the current mobility car, it can take out the screw link easily by instruments such as general spanner or screw-drivers and take off car plate, some lawless persons usually steal to sell off behind the car plate and obtain interests or carry out illegal activity, make troubles to the car owner, also give and safeguard that civil order makes troubles.For the appearance that solves this type of problem must improve fastening screw trip bolt, make it have antitheft function.

Summary of the invention

The purpose of this utility model is to provide a kind of locking of forward clockwise, the unidirectional fastening screw trip bolt that can not oppositely unscrew.

The purpose of this utility model is achieved in that a kind of unidirectional fastening screw trip bolt, comprise thread section and head, wherein: described head end is provided with two evaginations can locate the positioning wedged block that body turns clockwise, and described two positioning wedged blocks become the center symmetry mutually, have one to parallel but mutually not relative rotation positioning limit and to the curved surface of end face transition respectively.

Above-mentioned unidirectional fastening screw trip bolt, the annulus limit of described head is angle by interior exterior edge face and intersects and to constitute, non-concealed head and can realize preventing tonger can not with the stressed effect in its location.

The utility model is owing to adopt said structure, can locate the positioning wedged block that body turns clockwise by establishing in head end, the rotation positioning checkpost of straight screwdriver and positioning wedged block anchors the position and just can drive screw body and just changeing clockwise and tighten, and is skidded off and can't be located by the curved surface to the end face transition during counter-rotating.The utility model can only be tightened the technique effect that can not unscrew and prevent from oppositely to unscrew the occasion of screw to be specially adapted to solid envelope license plate for vehicle applicable to need, the installation that realizes license plate for vehicle easily, connect the purpose of firm and anti-detaching theft-proof.

That the utility model compared with prior art has is simple in structure, seal advantages such as effective admittedly.

Description of drawings

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

Fig. 1 is a perspective view of the present utility model;

Fig. 2 is a sectional structure schematic representation of the present utility model;

Fig. 3 is a plan structure schematic representation of the present utility model;

Fig. 4 is a user mode reference drawing of the present utility model.

Among the figure: 1 is thread section, and 2 is head, and 3 is positioning wedged block, and 31 is the rotation positioning limit, and 32 is curved surface.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail, but does not constitute any restriction of the present utility model.

As Fig. 1, Fig. 2 and shown in Figure 3, a kind of unidirectional fastening screw trip bolt, comprise thread section 1 and head 2, head 2 end faces are provided with two evaginations and can locate positioning wedged block 3, two positioning wedged blocks 3 mutual one-tenth center symmetries that body turns clockwise, have one to parallel but not relative mutually rotation positioning limit 31 and to the curved surface 32 of end face transition respectively; The annulus limit of head 2 is angle by interior exterior edge face and intersects and to constitute.

As shown in Figure 4, this is practical when specifically installing and using, car plate 4 is buckled on the pallet 5 that is fixed on the car body, the following holder of extending downwards with both sides, pallet bottom evagination of car plate is buckled and is interlocked, the default positioning hole on car plate 4 and both sides, pallet 5 top is corresponding, and it is corresponding with positioning hole that nut is placed on pallet 5 rear portions, unidirectional fastening screw trip bolt successively puts the mounting hole and the nut that pass car plate 4 and pallet 5 behind base 6 and the pad and is spirally connected fixing, regulating calibration after install successively on both sides again inserts between the rotation positioning limit 31 of two positioning wedged blocks 3 with screw-driver, drive the reverse rotation positioning limit 31 of two-phase when screw-driver turns clockwise and tighten the set screw body, block 7 is directly buckled into base 5 with the tack instrument, unidirectional fastening screw trip bolt body make instrument can't with the counter-rotating of its location, thereby can't pry open and realize the purpose of Automobile registration anti-detaching theft-proof.

Claims

1. unidirectional fastening screw trip bolt, comprise thread section (1) and head (2), it is characterized in that: described head (2) end face is provided with two evaginations can locate the positioning wedged block (3) that body turns clockwise, and described two positioning wedged blocks (3) become the center symmetry mutually, have one to parallel but mutually not relative rotation positioning limit (31) and to the curved surface (32) of end face transition respectively.

2. unidirectional fastening screw trip bolt according to claim 1 is characterized in that: the annulus limit of described head (2) is angle by interior exterior edge face and intersects and to constitute.