CN203906494U

CN203906494U - Bolt

Info

Publication number: CN203906494U
Application number: CN201420317778.0U
Authority: CN
Inventors: 费小芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-13
Filing date: 2014-06-13
Publication date: 2014-10-29
Anticipated expiration: 2024-06-13

Abstract

The utility model discloses a bolt. The bolt comprises a screw and a bolt head, wherein the screw and the bolt head are formed integrally, a threaded counter bore is formed in the upper surface, far away from the screw, of the bolt head, the threaded counter bore and the screw are coaxial, the direction of threads of the threaded counter bore is opposite to the direction of threads of the screw, an umbrella-shaped gasket is arranged on the lower bottom surface, connected with the screw, of the bolt head, the lower bottom surface of the umbrella-shaped gasket is an arched surface which is concave inwards, one or more clamping grooves are formed in the lower bottom surface of the umbrella-shaped gasket, and the bolt head is covered with a plastic protective cover after the bolt is screwed. According to the bolt, due to the fact that the threaded counter bore is formed in the upper surface of the bolt head, when the bolt can not be unscrewed under the condition that the bolt head of the bolt is abraded, another bolt can be screwed into the threaded counter bore; due to the fact that the screwing direction of the threaded counter bore is opposite to the screwing direction of the screw, the ineffective bolt can be unscrewed when the new bolt is screwed into the threaded counter bore with large force, and the ineffective bolt can be replaced by the new bolt conveniently.

Description

A kind of bolt

Technical field

The utility model relates to a kind of bolt, belongs to bolt technical field.

Background technique

Bolt, as a kind of fastening piece connecting for object, is widely used on various apparatuses.In the maintenance of apparatus, Renewal process, bolt is repeatedly tightened and is unscrewed.Thereby make screw bolt abrasion more serious, after the bolt head of some bolt repeatedly clamps, it is round that its corner angle can become, even if want the bolt more renewing, be difficult to turn whole bolt at tool holding bolt heads such as using spanner this time.

Summary of the invention

The purpose of this utility model is: a kind of bolt is provided, and this bolt can, in the situation that bolt head lost efficacy, be unscrewed bolt by its screw-threaded counterbore, and this type bolt does not need other pad in use.

The technical solution of the utility model: a kind of bolt, include integrated screw rod and bolt head, on bolt head upper surface away from screw rod, be provided with 1 with the screw-threaded counterbore of screw coaxial, the hand of spiral of this screw-threaded counterbore and screw flight opposite direction, it on the bottom surface that bolt head is connected with screw rod, is 1 umbellate form pad, the bottom surface of umbellate form pad is the arcuate surface concaving, on the bottom surface of umbellate form pad, offer 1 above draw-in groove, after bolt tightening, enter in bolt head upper cover the protective housing that plastics are made.

Above-mentioned bolt, the aperture of described screw-threaded counterbore is 0.5-1 times of screw rod bar footpath.

Above-mentioned bolt, the degree of depth of described screw-threaded counterbore is 0.8-1.2 times of bolt head thickness.

Above-mentioned bolt, described draw-in groove is oblique draw-in groove, its oblique direction is identical with screw flight rotation direction.

The beneficial effects of the utility model: the utility model by being provided with 1 screw-threaded counterbore on the upper surface of bolt head, when being worn, the bolt head of this type bolt cannot will fall while unscrewing, can use an other bolt to be screwed in screw-threaded counterbore, because the rotation direction of screw-threaded counterbore is contrary with the rotation direction of screw rod, firmly bolt is screwed in screw-threaded counterbore process, the bolt of inefficacy can be unscrewed, thus the bolt of being convenient to more renew; In use, bottom surface deforms after contacting with part surface this new bolt, produces elastic deformation force, together with this elastic deformation force makes to fit tightly between bolt head bottom surface and part surface; And on the bottom surface of umbellate form pad, be provided with oblique draw-in groove, draw-in groove is oblique identical with screw rod rotation direction, this screw rod is screwed in process, draw-in groove can snap on part surface, it is large that frictional force between bolt and part becomes, thereby easily come off while having avoided bolt to use in the situation that vibration is more serious, and do not need extra pad in installation process, save operation, also saved cost; And be provided with protective housing, one can avoid bolt head to use under outdoor environment time, after long term exposure, the damage that gets rusty easily, two avoid rainwater to enter into screw-threaded counterbore goes, and makes the screw-threaded counterbore damage of getting rusty, in the time that needs use screw-threaded counterbore to looser a bolt, bolt hole cannot use.Bolt of the present utility model has done some small structural adjustments on existing structure, but practicability is more intense, has good use value.

Brief description of the drawings

Accompanying drawing 1 is main TV structure schematic diagram of the present utility model;

Accompanying drawing 2 is plan structure schematic diagram of the present utility model;

Reference character: 1-screw rod, 2-bolt head, 3-screw-threaded counterbore, 4-umbellate form pad, 5-draw-in groove, 6-protective housing.

Embodiment

Embodiment of the present utility model: a kind of bolt, as shown in accompanying drawing 1-2, include integrated screw rod 1 and bolt head 2, on bolt head 2 upper surfaces away from screw rod 1, be provided with 1 screw-threaded counterbore 3 coaxial with screw rod 1, the hand of spiral of this screw-threaded counterbore 3 is contrary with the hand of spiral of screw rod 1, it on the bottom surface that bolt head 2 is connected with screw rod 1, is 1 umbellate form pad 4, the bottom surface of umbellate form pad 4 is the arcuate surface concaving, on the bottom surface of umbellate form pad 4, offer 1 above draw-in groove 5, after bolt tightening, enter in bolt head 2 upper covers the protective housing 6 that plastics are made.

When this new bolt uses, screw rod 1 is screwed in process, umbellate form pad 4 on bolt head 2 bottom surfaces can contact with part surface, because the bottom surface of umbellate form pad 4 is arcuate surface, after being firmly screwed in contact process, its bottom surface is easily distortion just, fit with part surface, increase the frictional force between bolt and part, and on the bottom surface of umbellate form pad 4, also offer draw-in groove 5, umbellate form pad 4 contacts with part, in deformation process, draw-in groove 5 can snap onto in part surface and go, thereby it is more firm to make to connect effect, avoid in the situation of serious vibration, bolt there will be loosening.After bolt repeatedly uses, each corner angle of its bolt head 2 can be worn gradually, in the time that needs are unscrewed bolt, use the fixture clamping screw heads 2 such as spanner to be just difficult to looser a bolt, can use this time a screw to be screwed in screw-threaded counterbore 3 and go, because the thread rotary orientation of screw-threaded counterbore 3 is contrary with the thread rotary orientation of screw rod 1, in the continuous rundown process of screw, bolt can be unscrewed, then replace with new bolt.Because bolt long term exposure is in outside; while use under outdoor environment especially; bolt is easily subject to the effect of rainwater; the damage of getting rusty; therefore enter the protective housing 6 of a plastic support in bolt head 2 upper covers; one can protect the bolt head 2 can rainwater effect, and two can avoid rainwater to enter into screw-threaded counterbore 3 goes, and makes screw-threaded counterbore 3 damage of getting rusty.

This bolt is in working process, and the aperture of its screw-threaded counterbore 3 is 0.5-1 times of screw rod 1 bar footpath, and the degree of depth of screw-threaded counterbore 3 is 0.8-1.2 times of bolt head 2 thickness.One guarantees that the structure of screw-threaded counterbore 3 can not have influence on the performance of this bolt, two avoids the aperture of screw-threaded counterbore 3 too little, the degree of depth is too shallow, and screw is screwed in process easily failure mode, is difficult to play a role.

And in draw-in groove 5 working process, can be oblique draw-in groove, its oblique direction is identical with the thread rotary orientation of screw rod 1.Like this, in screw rod 1 screw-in process, its oblique draw-in groove will constantly snap onto in part surface and go, make between bolt and part contact better.

Claims

1. a bolt, it is characterized in that: include integrated screw rod (1) and bolt head (2), on bolt head (2) upper surface away from screw rod (1), be provided with 1 screw-threaded counterbore (3) coaxial with screw rod (1), the hand of spiral of this screw-threaded counterbore (3) is contrary with the hand of spiral of screw rod (1), on the bottom surface that bolt head (2) is connected with screw rod (1), it is 1 umbellate form pad (4), the bottom surface of umbellate form pad (4) is the arcuate surface concaving, on the bottom surface of umbellate form pad (4), offer 1 above draw-in groove (5), after bolt tightening, enter in bolt head (2) upper cover the protective housing (6) that plastics are made.

2. bolt according to claim 1, is characterized in that: the aperture of described screw-threaded counterbore (3) is 0.5-1 times of screw rod (1) bar footpath.

3. bolt according to claim 1, is characterized in that: the degree of depth of described screw-threaded counterbore (3) is 0.8-1.2 times of bolt head (2) thickness.

4. bolt according to claim 1, is characterized in that: described draw-in groove (5) is oblique draw-in groove, and its oblique direction is identical with the thread rotary orientation of screw rod (1).