CN200961618Y - Loose-proof anti-theft nut - Google Patents

Abstract

The utility model relates to a nut for fastening, in particular to an anti-release and anti-theft nut for fastening the field equipments, wherein the inner surface of a screw hole of the nut is provided with an inner screw thread and opened with a blind slot, a steel pin is arranged inside the blind slot, and one side of a conodont of the inner screw thread is designed with a sloping side intersected with the other side of the conodont, which forms a trilateral conodont. The utility model can homogeneously distribute the axial tensile force screwed by the bolt on each conodont of the nut, thereby producing great locking force, playing the anti-theft function, and at the same time preventing the screw thread sub from losing the fastening force and loosing. The utility model can be widely applicable for the field road administration facilities, high-voltage circuit facilities, generator group apparatus and so on.

Description

Locking, anti-theft nut

(1) technical field

The utility model is a kind of nut that plays the role of fastening, especially for field facility fastening locking, anti-theft nut.

(2) background technique

To be nut screw in bolt by a direction carries out fasteningly in existing fastening cooperation with nuts and bolt, and back-out to another way can be unclamped.This nut, bolt cooperate the employing general tool nut can be unloaded as easy as rolling off a log the pilferage.Stolen for preventing nut, people have proposed various solutions, wherein more representationally are exactly to have blind groove at the thread inner surface of screw, are provided with draw point in the blind groove.By extruding, make the nut that screws in bolt be difficult to oppositely screw out, thereby play antitheft effect draw point.Anti-theft nut mainly is to use for a long time in the open air, bear wind-force load and vibrational loading.First tooth, second pitch thread of general anti-theft nut bear 80% above axial tensile force, under long-term wind-force load and vibrational loading, first tooth, second tooth get loose easily, and the screw pair effect that whole like this nut is formed is become flexible with regard to therefore losing coupling mechanism force, corresponding its fastening effect forfeiture.

(3) summary of the invention

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of both can be antitheft in long-term the use, can prevent locking, the anti-theft nut that become flexible again.

Solution of the present utility model is: a kind of locking, anti-theft nut, its screw internal surface has internal thread, has blind groove at the screw internal surface, is provided with draw point in the blind groove, be characterized in that on internal thread thread form one side design one hypotenuse and another side of thread form intersect, formation triangle thread form.

Locking working principle of the present utility model is: after the clockwise screw-in of the screw pair that bolts and nuts are formed is also fastening, make bolt produce axial tensile force.Because internal thread is the triangle thread form, make bolt outside thread crest wedge tightly on the plane of inclination of triangle thread form, bolt axial tensile force effective function is on each thread form of nut, each thread form bears almost equal axial tensile force, its axial tensile force is distributed in the total length of thread engagement, thereby produce very big coupling mechanism force, can bear wind-force load and vibrational loading for a long time.

The angular range that can design internal thread thread form side and hypotenuse in the solution of the present utility model as required is 25 °～35 °, makes bolts and nuts form the axial tensile force distribution uniform of screw pair.

On internal thread thread form one side, design 1/2 to 1/3 place of the starting point of a hypotenuse in the solution of the present utility model at internal thread thread form side.

Advantage of the present utility model: because the utility model designs a hypotenuse on internal thread thread form one side and another side of thread form intersects, its crest is wedged the plane of inclination of internal thread tightly after the bolt precession, bolt axial tensile force effective function is on each thread form of nut, overcome nut in the prior art only first tooth, second tooth bear the defective of most of axial tensile force, played the effect of becoming flexible of preventing.

(4) description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the internal thread sectional view.

(5) embodiment

The utility model embodiment as shown in Figure 1 and Figure 2, screw 2 internal surfaces of nut 1 have blind groove 3, are provided with on 4,60 ° of thread form internal threads of draw point, one side 6 design one hypotenuse 7 in the blind groove 3 and intersect with thread form 5 another sides 6.It is 30 ° that hypotenuse 7 intersects the angle a that is constituted with thread form 5 another sides 6, and the starting point of design one hypotenuse 7 is at 1/2 to 1/3 place of internal thread thread form 5 sides 6 on thread form 5 one sides 6.

Claims (3)

1, a kind of locking, anti-theft nut, its screw (2) internal surface has internal thread, have blind groove (3) at screw (2) internal surface, be provided with draw point (4) in the blind groove (3), it is crossing with thread form (5) another side (6) to it is characterized in that internal thread thread form (5) one sides (6) are gone up design one hypotenuse (7), forms triangle thread form (5).

2, locking, anti-theft nut according to claim 1 is characterized in that internal thread thread form (5) side (6) and the angular range of hypotenuse (7) are 25 °～35 °.

3, locking, anti-theft nut according to claim 1 is characterized in that internal thread thread form (5) one sides (6) upward design 1/2 to 1/3 place of the starting point of a hypotenuse (7) at internal thread thread form (5) side.

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