CN201041186Y

CN201041186Y - Theft-proof nut

Info

Publication number: CN201041186Y
Application number: CNU2007200901427U
Authority: CN
Inventors: 陈四甫
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-04-23
Filing date: 2007-04-23
Publication date: 2008-03-26
Anticipated expiration: 2017-04-23

Abstract

The utility model relates to a nut, in particular to an anti-theft nut for fastening parts or components in the field facilities of an electric power system, a communication system, an express highway, etc. The anti-theft comprises a nut body, the upper part of the nut body is a truncated cone, a round column is connected to the lower part, at least two wedge-shaped depth changeable grooves are arranged at the upper end surface of the truncated cone, an inner thread is arranged on the inner wall of the threaded hole of a nut body, an anti-theft groove is arranged on the inner wall of the threaded hole, an elastic ball, a spring and a limiting block are positioned in the anti-theft groove, the limiting block is fixed and installed in the anti-theft groove, the diameter of the round column at the lower part of the nut body is smaller than the diameter of the bottom surface of the truncated cone, a round column pipe shaped anti-theft outer sleeve is arranged on the outer surface of the round column, the inner diameter of the anti-theft outer sleeve is slightly larger than the diameter of the round column, and the height of the anti-theft outer sleeve is higher than the round column. The utility model provides an anti-theft nut with good anti-theft performance, convenient installation and low cost.

Description

Anti-theft nut

(1), technical field: the utility model relates to a kind of nut, particularly relate to a kind of in field facilities such as electric power system, communication system and expressway the anti-theft nut of fastenings or member.

(2), background technique: the nut of Shi Yonging mostly is hexagon prism shape greatly generally speaking, and do not have an anti-theft feature, but at some special occasions, electric power pylon as electric power system, the guardrail of expressway etc. is located, for preventing lawless person's destruction, then require nut to have anti-theft feature, for this reason, people have designed various anti-theft nuts, have the people that nut is designed to polygonal cylindricality, have the people that anti-stealing and selling is installed in nut, though these designs have certain anti-theft feature, but theftproof performance still is not ideal, and for the anti-nut of stealing and selling is arranged, installation procedure is complicated; In addition, the somebody opens a groove with the inwall of nut, place a steel ball in the groove, as number of patent application be 03262443.3 and number of patent application be that 03213595.5 patent document discloses two kinds of nuts, though its theftproof performance strengthens to some extent, if but oppositely use a very powerful strength, and steel ball is destroyed, then also nut might be turned on.

(3), model utility content:

The technical problems to be solved in the utility model is: overcome the defective of prior art, the anti-theft nut that a kind of theftproof performance is good, easy for installation, cost is low is provided.

The technical solution of the utility model: a kind of anti-theft nut, contain nut body, the top of nut body is circular cone, and the bottom is connected to cylinder, and the circular cone upper-end surface is provided with two Wedging depth recess at least, and the tapped hole inwall of nut body is provided with internal thread.

Be provided with antitheft groove at the tapped hole inwall, be placed with hoodle, spring and block in the antitheft groove, block is fixedly mounted in the antitheft groove.

The diameter of the cylinder of nut body bottom is less than the diameter of the circular cone bottom surface on nut body top, and the outer surface of cylinder is provided with an antitheft overcoat of cylindrical tube, and the internal diameter of antitheft overcoat is a bit larger tham the diameter of cylinder, and the height of antitheft overcoat is less than the height of cylinder.

The direction of antitheft groove is consistent with the direction of internal thread, and dark in the middle of it, two ends are shallow.

The quantity of Wedging depth recess is two, or is three, or is four, or is five, or is six; Described hoodle is a steel ball.

The tapped hole inwall is equipped with interim pipe close, and this interim pipe close is a dome-shaped, the vertical protruding line of the uniform some of its outer side surface, the external diameter of pipe close and the internal diameter of tapped hole coupling; This interim pipe close can prevent that hoodle and spring drop out when depositing or anti-theft nut is installed from antitheft groove, in the process that anti-theft nut is installed, interim pipe close can withdraw from from tapped hole automatically.

When anti-theft nut is installed, block the inner side surface of Wedging depth recess with special tool, this anti-theft nut of precession, because the hoodle in the antitheft groove is blocked by block, it can only be brought into the bosom in the middle of the antitheft groove, can not influence the rotation between anti-theft nut and the bolt, therefore this anti-theft nut can be tightened; In the time will screwing out anti-theft nut, owing to do not have the strong point of power, and also the hoodle in the antitheft groove is brought into the edge of antitheft groove, be stuck in the screw thread of anti-theft nut and bolt, anti-theft nut and bolt can not be rotated mutually, therefore, this anti-theft nut can't be screwed out, reach antitheft purpose.

The beneficial effects of the utility model:

1. the utility model has adopted the double anti-theft measure, not only be provided with the wedge slot that has only the single load bearing face in the upper-end surface of circular anti-theft nut, and in antitheft groove, be provided with hoodle, spring and block, having guaranteed forcefully can only the precession anti-theft nut, and can not screw out anti-theft nut.

2. not only be provided with hoodle and block in the antitheft groove of the present utility model, also be provided with spring, this spring can guarantee that when not revolving anti-theft nut hoodle is in the edge of antitheft groove, and therefore, this anti-theft nut also has locking functions.

3. profile of the present utility model is designed to garden shape, and outer side surface is provided with antitheft overcoat, can prevent that like this lawless person from rotating by force with the side that things such as pipe wrench block anti-theft nut, protected anti-theft nut.

4. the utility model is easy for installation, cost is low.

(4), description of drawings:

Fig. 1 is one of structural representation of anti-theft nut;

Fig. 2 is the right elevation structural representation of Fig. 1;

Fig. 3 be anti-theft nut structural representation two;

Fig. 4 is the right elevation structural representation of Fig. 3;

Fig. 5 be anti-theft nut structural representation three;

Fig. 6 is the right elevation structural representation of Fig. 5;

Fig. 7 is an A-A sectional view structural representation;

Fig. 8 be anti-theft nut structural representation four;

Fig. 9 is the right elevation structural representation of Fig. 8;

Figure 10 is a B-B sectional view structural representation;

(5), embodiment:

Embodiment one: referring to Fig. 1～Fig. 2, among the figure, anti-theft nut contains nut body, and the top 8 of its nut body is circular cone, and bottom 7 is connected to cylinder, and the circular cone upper-end surface is evenly equipped with three Wedging depth recess 5, and tapped hole 10 inwalls of nut body are provided with internal thread.

When anti-theft nut is installed, block the inner side surface 4 of Wedging depth recess 5, tighten this anti-theft nut, in the time will screwing out anti-theft nut,, then this anti-theft nut can't be screwed out, reach antitheft purpose owing to there is not the strong point of power with special tool.

Embodiment two: referring to Fig. 3～Fig. 4, numbering is identical with embodiment one among the figure, the meaning of representative is identical, its working procedure is also basic identical, something in common does not repeat, and difference is: the diameter of the cylinder of nut body bottom 7 is less than the diameter of the circular cone bottom surface on nut body top 8, and the outer surface of cylinder is provided with an antitheft overcoat 9 of cylindrical tube, the internal diameter of antitheft overcoat 9 is a bit larger tham the diameter of cylinder, and the height of antitheft overcoat 9 is less than the height of cylinder; Antitheft overcoat 9 can rotate at the outer surface of cylinder, therefore, can prevent that the lawless person from rotating by force with the side that things such as pipe wrench block anti-theft nut.

Embodiment three: referring to Fig. 5～Fig. 7, numbering is identical with embodiment one among the figure, the meaning of representative is identical, its working procedure is also basic identical, something in common does not repeat, difference is: be provided with antitheft groove 6 at tapped hole 10 inwalls, be placed with hoodle 1, spring 2 and block 3 in the antitheft groove 6, block 3 is fixedly mounted in the antitheft groove 6.

The direction of antitheft groove 6 is consistent with the direction of internal thread, and dark in the middle of it, two ends are shallow; Hoodle 1 is a steel ball.

Tapped hole 10 inwalls are equipped with interim pipe close, and this interim pipe close is a dome-shaped, the vertical protruding line of the uniform some of its outer side surface, the external diameter of interim pipe close and the internal diameter of tapped hole coupling; This interim pipe close is made of plastic, and it can prevent that hoodle 1 and spring 2 drop out when depositing or anti-theft nut is installed from antitheft groove 6, and in the process that anti-theft nut is installed, interim pipe close can withdraw from from tapped hole 10 automatically.

When the precession anti-theft nut, because the hoodle 1 in the antitheft groove 6 is blocked by block 3, it can only be brought into the bosom in the middle of the antitheft groove 6, can not influence the rotation between anti-theft nut and the bolt, therefore this anti-theft nut can be tightened; When screwing out anti-theft nut, the hoodle 1 in the antitheft groove 6 is brought into the edge of antitheft groove 6, is stuck in the screw thread of anti-theft nut and bolt, and anti-theft nut and bolt can not rotate mutually, therefore, this anti-theft nut can't be screwed out.

Embodiment four: referring to Fig. 8～Figure 10, numbering is identical with embodiment three among the figure, the meaning of representative is identical, its working procedure is also basic identical, something in common does not repeat, and difference is: the diameter of the cylinder of nut body bottom 7 is less than the diameter of the circular cone bottom surface on nut body top 8, and the outer surface of cylinder is provided with an antitheft overcoat 9 of cylindrical tube, the internal diameter of antitheft overcoat 9 is a bit larger tham the diameter of cylinder, and the height of antitheft overcoat 9 is less than the height of cylinder; Antitheft overcoat 9 can rotate at the outer surface of cylinder, therefore, can prevent that the lawless person from rotating by force with the side that things such as pipe wrench block anti-theft nut.

More than the anti-theft nut narrated among four kinds of embodiments not only theftproof performance is good but also anti-destruction is good, confirm according to test: the common hexagonal anti-theft nut that has hoodle for inside, when with pipe wrench by force in the other direction during turn-knob, the strength of granting pipe tongs wrench can be up to 100 kilograms, at this moment anti-theft nut is destroyed usually, does not have antitheft effect; For the anti-theft nut described in present embodiment one and the embodiment three, when the strength of granting pipe tongs wrench during greater than 15 kilograms, pipe wrench just begins to skid, inoperative, this moment, anti-theft nut was also excellent, and for the anti-theft nut described in present embodiment two and the embodiment four, pipe wrench is just more inoperative.

Claims

1. an anti-theft nut contains nut body, it is characterized in that: the top of nut body is circular cone, and the bottom is connected to cylinder, and the circular cone upper-end surface is provided with two Wedging depth recess at least, and the tapped hole inwall of nut body is provided with internal thread.

2. anti-theft nut according to claim 1 is characterized in that: be provided with antitheft groove at the tapped hole inwall, be placed with hoodle, spring and block in the antitheft groove, block is fixedly mounted in the antitheft groove.

3. anti-theft nut according to claim 1 and 2, it is characterized in that: the diameter of the cylinder of nut body bottom is less than the diameter of the circular cone bottom surface on nut body top, the outer surface of cylinder is provided with an antitheft overcoat of cylindrical tube, the internal diameter of antitheft overcoat is a bit larger tham the diameter of cylinder, and the height of antitheft overcoat is less than the height of cylinder.

4. anti-theft nut according to claim 3 is characterized in that: the direction of antitheft groove is consistent with the direction of internal thread, and dark in the middle of it, two ends are shallow.

5. anti-theft nut according to claim 4 is characterized in that: the quantity of Wedging depth recess is two, or is three, or is four, or is five, or is six; Described hoodle is a steel ball.

6. anti-theft nut according to claim 5 is characterized in that: the tapped hole inwall is equipped with interim pipe close, and this interim pipe close is a dome-shaped, the vertical protruding line of the uniform some of its outer side surface, the external diameter of pipe close and the internal diameter of tapped hole coupling.