CN203189450U - Self-locking and anti-loosening expansion screw - Google Patents
Self-locking and anti-loosening expansion screw Download PDFInfo
- Publication number
- CN203189450U CN203189450U CN 201320076828 CN201320076828U CN203189450U CN 203189450 U CN203189450 U CN 203189450U CN 201320076828 CN201320076828 CN 201320076828 CN 201320076828 U CN201320076828 U CN 201320076828U CN 203189450 U CN203189450 U CN 203189450U
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- CN
- China
- Prior art keywords
- screw
- locking
- self
- draw
- loosening
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a self-locking and anti-loosening expansion screw. The self-locking and anti-loosening expansion screw comprises a screw body and a screw sleeve, wherein an expansion hole allowing the screw body to penetrate is formed in the screw sleeve, the lower portion of the expansion hole contracts towards the center to form a big-end-up cone-shaped hole, a plurality of clamping grooves are formed in the inner wall of the cone-shaped hole from top to bottom, the cross section of each clamping groove is of a structure of a triangle composed of an upper horizontal blocking edge, a first bevel edge formed by the inner wall of the cone-shaped hole and a second bevel edge connected with the horizontal blocking edge and the first bevel edge, and a boss matched with the clamping grooves in a clamping mode is arranged at the lower end of the screw body. According to the self-locking and anti-loosening expansion screw, due to the fact that the clamping grooves matched with the boss on the screw in a clamping mode are formed inside the screw sleeve, a self-locking function is achieved after the screw enters one clamping groove, the screw is prevented from returning to an original position, the screw is effectively prevented from loosening, and the fastening performance of an article is improved.
Description
Technical field
The utility model belongs to technical field of fastening, is specifically related to the locking expandable nail of a kind of self-locking.
Background technique
Expandable nail in the market is to be made of screw and outside nail cover thereof, and its expansion angle is that the width bottom the nail cover decides, so restriction to some extent, the space is big within the walls in case run into, and is difficult to swelling, and is easily loosening; And expandable nail do not have auto-lock function, and is easily loosening after long-time the use, do not reach the purpose of fastening object.
Summary of the invention
Technical problem to be solved in the utility model is at above-mentioned the deficiencies in the prior art, provides a kind of self-locking locking expandable nail, and it has auto-lock function, prevents the loosening of expandable nail.
The technological scheme that the utility model adopts is: the locking expandable nail of a kind of self-locking, comprise screw and nail cover, be provided with the inflation port that penetrates for screw in the described nail cover, described inflation port bottom is shunk to its central position and is formed a up big and down small cone shape hole, be provided with a plurality of draw-in grooves on the inwall of described cone shape hole from top to bottom, the section of described draw-in groove is the horizontal rib by top, the triangular structure that first hypotenuse that is made of the cone shape hole inwall and second hypotenuse that connects described horizontal rib and described first hypotenuse constitute, described screw lower end is provided with the boss that ends coupling with above-mentioned draw-in groove card.
As preferably, the distance on the described cone shape hole between the two adjacent draw-in grooves equates.
As preferably, be provided with three draw-in grooves on the described cone shape hole altogether.
The beneficial effects of the utility model are: because the utility model is at the inner draw-in groove that ends coupling with screw epirelief decometer that is provided with of nail cover, after entering draw-in groove, screw can realize auto-lock function, avoid screw to reply the home position, can effectively prevent screw loosening, improve the fastening performance of object.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is A place enlarged diagram among Fig. 1.
Among the figure: 1, nail cover; 2, screw; 3, inflation port; 4, cone shape hole; 5, draw-in groove; 6, boss; 51, horizontal rib; 52, first hypotenuse; 53, second hypotenuse.
Embodiment
Below in conjunction with the accompanying drawings and the specific embodiments the utility model is described in further detail.
As depicted in figs. 1 and 2, the locking expandable nail of a kind of self-locking, comprise screw 2 and nail cover 1, be provided with the inflation port 3 that penetrates for screw 2 in the described nail cover 1, described inflation port 3 bottoms are shunk to its central position and are formed a up big and down small cone shape hole 4, be provided with a plurality of draw-in grooves 5 on the inwall of described cone shape hole 4 from top to bottom, the section of described draw-in groove 5 is the horizontal rib 51 by top, first hypotenuse 52 that is made of cone shape hole 4 inwalls and connect described horizontal rib 51 and triangular structure that second hypotenuse 53 of described first hypotenuse 52 constitutes, described screw 2 lower ends are provided with above-mentioned draw-in groove 5 cards ends the boss 6 of coupling.Be provided with three draw-in grooves 5 on the described cone shape hole 4 altogether, the distance on the described cone shape hole 4 between the two adjacent draw-in grooves 5 equates.
End the draw-in groove 5 of coupling because the utility model is provided with in nail cover 1 inside with screw 2 convex platforms 6 cards, after screw 2 enters draw-in groove 5, can realize auto-lock function, avoid screw 2 to reply the home position, can prevent effectively that screw 2 is loosening, improve the fastening performance of object.
The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented with this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model patent contains.
Claims (3)
1. locking expandable nail of self-locking, comprise screw (2) and nail cover (1), be provided with the inflation port (3) that penetrates for screw (2) in the described nail cover (1), it is characterized in that: described inflation port (3) bottom is shunk to its central position and is formed a up big and down small cone shape hole (4), be provided with a plurality of draw-in grooves (5) on the inwall of described cone shape hole (4) from top to bottom, the section of described draw-in groove (5) is the horizontal rib (51) by top, first hypotenuse (52) that is made of cone shape hole (4) inwall and connect described horizontal rib (51) and triangular structure that second hypotenuse (53) of described first hypotenuse (52) constitutes, described screw (2) lower end is provided with above-mentioned draw-in groove (5) card ends the boss (6) that mates.
2. the locking expandable nail of self-locking according to claim 1 is characterized in that: the distance between described cone shape hole (4) the last two adjacent draw-in grooves (5) equates.
3. the locking expandable nail of self-locking according to claim 1 is characterized in that: be provided with three draw-in grooves (5) on the described cone shape hole (4) altogether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320076828 CN203189450U (en) | 2013-02-19 | 2013-02-19 | Self-locking and anti-loosening expansion screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320076828 CN203189450U (en) | 2013-02-19 | 2013-02-19 | Self-locking and anti-loosening expansion screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203189450U true CN203189450U (en) | 2013-09-11 |
Family
ID=49106312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320076828 Expired - Fee Related CN203189450U (en) | 2013-02-19 | 2013-02-19 | Self-locking and anti-loosening expansion screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203189450U (en) |
-
2013
- 2013-02-19 CN CN 201320076828 patent/CN203189450U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20150219 |
|
| EXPY | Termination of patent right or utility model |