CN213360736U

CN213360736U - Expansion screw with built-in nut

Info

Publication number: CN213360736U
Application number: CN202022416072.8U
Authority: CN
Inventors: 陈文明; 陈雅露
Original assignee: Hunan Zhichuang Science And Education Equipment Co ltd
Current assignee: Hunan Zhichuang Science And Education Equipment Co ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-06-04
Anticipated expiration: 2030-10-27

Abstract

The nut built-in expansion screw comprises a screw rod, a nut and a sleeve, wherein the rear end of the sleeve is closed, the front end of the sleeve is used for inserting the screw rod, the nut is arranged at the rear part in the sleeve, the cross section of the nut is polygonal, the inner wall surface of the rear part of the sleeve is matched with the outer wall surface of the nut so as to limit the rotation of the nut, the rear end of the screw rod is inserted into the nut and is in threaded connection with the nut, a plurality of elastic locking pieces which are bent towards the inner cavity of the sleeve are arranged on the wall surface of the sleeve positioned at the front side of the nut, the front end of each elastic locking piece is provided with a hook-shaped part, and the nut can move forwards to push against the elastic locking pieces by rotating the screw rod, so that the elastic locking pieces expand and the hook-shaped parts extend out. The utility model discloses can improve the security and the aesthetic property of inflation screw.

Description

Expansion screw with built-in nut

Technical Field

The utility model belongs to the technical field of the inflation screw technique and specifically relates to indicate a built-in inflation screw of nut.

Background

The rear portion of a screw rod of a traditional expansion screw widely used in the market at present is in a cone shape, a sleeve and the screw rod are placed in a hole which is drilled in advance when the traditional expansion screw is used, after a part needing to be fixed is installed, the screw rod is fastened by a nut, the screw rod can extend out of a wall, the more the screw rod is fastened, the longer the extending portion of the screw rod is, the traditional expansion screw is not attractive and safe, and moreover, the outer diameter of the nut of the traditional expansion screw is usually larger than the outer diameter of the sleeve, so that inconvenience is caused when the expansion screw is matched with the hole position of the wall surface or a solid surface.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a built-in expansion screw of nut makes the screw rod realize the effect of inflation fastening toward the direction rotating in the wall to improve security and aesthetic property.

In order to solve the technical problem, the utility model discloses a following technical scheme: the rear end of the sleeve is closed, the front end of the sleeve is used for inserting the screw rod, the nut is arranged at the rear part in the sleeve, the cross section of the nut is polygonal, the inner wall surface of the rear part of the sleeve is matched with the outer wall surface of the nut so as to limit the rotation of the nut, the rear end of the screw rod is inserted into the nut and is in threaded connection with the nut, a plurality of elastic locking pieces which are bent towards the inner cavity of the sleeve are arranged on the wall surface of the sleeve on the front side of the nut, and hook-shaped parts are arranged at the front ends of the elastic locking pieces.

Preferably, the elastic locking piece and the sleeve are of an integrated structure, and one end of the hook-shaped part is also provided with a tooth-shaped structure.

More preferably, the number of the elastic locking pieces is at least four, and each elastic locking piece is arranged on the sleeve at equal intervals along the ring shape.

More preferably, the screw comprises a head, a shank matching the internal diameter of the sleeve and a threaded portion for insertion into the nut.

More preferably, a spring washer and a flat washer are further arranged between the head of the screw and the front end face of the sleeve, the spring washer is located between the head of the screw and the flat washer, and the flat washer is located between the spring washer and the front end face of the sleeve.

More preferably, the outer edge of the front end surface of the nut is provided with a chamfer.

The utility model discloses a theory of operation is: after the hole is drilled on the wall surface or the entity, the sleeve pipe assembled with the screw rod and the nut can extend into the hole, the screw rod is screwed inwards, the nut can move forwards and is pushed against the elastic locking sheet to expand the elastic locking sheet, and the hook-shaped part at the front end of the elastic locking sheet can be clamped into the wall body or the entity to achieve the effects of locking and looseness prevention.

Because the nut is built-in, the outer diameter of the sleeve is the whole outer diameter of the expansion screw, and a protruding structure like the existing expansion screw does not exist, so that the nut can be well adapted to hole positions in the actual use process; and because the expansion locking is realized by screwing the screw rod into the sleeve in the direction, the screw rod cannot extend out of a very obvious part from the wall surface or the solid surface, and the expansion locking is safe and attractive.

Drawings

Fig. 1 is a schematic cross-sectional view of the overall structure in an embodiment of the present invention;

fig. 2 is a schematic view of an exploded state of the overall structure in the embodiment of the present invention.

The reference signs are:

1-screw rod 2-nut 3-sleeve

4-elastic locking piece 4 a-hook part 5-spring washer

6-Flat washer.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

It should be noted that, in the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Furthermore, in the present disclosure, unless explicitly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1-2, the nut built-in expansion screw includes a screw 1, a nut 2 and a sleeve 3, the rear end of the sleeve 3 is closed, the front end of the sleeve 3 is inserted by the screw 1, the nut 2 is arranged at the rear part of the sleeve 3, the cross section of the nut 2 is polygonal, the inner wall surface of the rear part of the sleeve 3 is matched with the outer wall surface of the nut 2 so as to limit the rotation of the nut 2, the rear end of the screw 1 is inserted into the nut 2 and is in threaded connection with the nut 2, a plurality of elastic locking pieces 4 which are bent towards the inner cavity of the sleeve 3 are arranged on the wall surface of the sleeve 3 at the front side of the nut 2, and the front end of the elastic locking pieces 4 is provided with a hook-shaped portion 4a, by rotating the screw 1, the nut 2 can move forward to push the elastic locking pieces 4, so that the elastic.

When the nut built-in expansion screw provided by the embodiment is used, the sleeve 3 can be directly inserted into a hole formed in a wall surface or an entity, then the screw rod 1 is screwed into the sleeve 3, so that the nut 2 can move forwards and push the elastic locking sheet 4 to expand the elastic locking sheet 4, and at the moment, the hook-shaped part 4a at the front end of the elastic locking sheet 4 can be clamped into the wall body or the entity, and the locking and anti-loosening effects are achieved. During the dismantlement, can rotate screw rod 1 outside sleeve pipe 3 earlier, can make nut 2 move backward and break away from gradually with the contact of elasticity locking plate 4, elasticity locking plate 4 can resume gradually the state of bending in sleeve pipe 3 under the elasticity effect of self so to make hook portion 4a can follow the wall body or the entity inner wall and withdraw out, can take out sleeve pipe 3 this moment in order to realize having dismantled.

The nut 2 of the expansion screw is built-in, so that the outer diameter of the sleeve 3 is the whole outer diameter of the expansion screw, and a protruding structure like the existing expansion screw does not exist, so that the expansion screw can be well adapted to hole positions in the actual use process; and because the expansion locking is realized by screwing the screw rod 1 into the sleeve 3, the screw rod 1 cannot extend out of a very obvious part from the wall surface or a solid surface, and the expansion locking is safe and attractive.

It should be noted that, as those skilled in the art will appreciate, the elastic locking piece 4 and the sleeve 3 may be an integral structure, that is, the elastic locking piece 4 may be a part of the sleeve 3 itself, and one end of the elastic locking piece may be subjected to a press bending process after the three edges are cut.

Preferably, one end of the hook 4a is further provided with a tooth structure to increase friction and biting force against a wall or a solid body.

More preferably, the number of the elastic locking pieces 4 is at least four, and the elastic locking pieces 4 are uniformly spaced on the sleeve 3 along the ring shape, so that the locking effect of the expansion screw is more firm and stable.

More preferably, the screw rod 1 comprises a head part, a rod part matched with the inner diameter of the sleeve 3 and a threaded part for being inserted into the nut 2, wherein a spring washer 5 and a flat washer 6 are further arranged between the head part of the screw rod 1 and the front end face of the sleeve 3, the spring washer 5 is located between the head part of the screw rod 1 and the flat washer 6, and the flat washer 6 is located between the spring washer 5 and the front end face of the sleeve 3, and the spring washer 5 is arranged to generate a certain outward acting force on the screw rod 1, so that the rear end of the screw rod 1 can form a forward acting force on the nut 2, and the nut 2 can further firmly abut against the elastic locking piece 4 forwards, and the fastening effect of the expansion screw is improved.

In addition, in this embodiment, the outer edge of the front end face of the nut 2 is provided with a chamfer, so that the process of adjusting the nut 2 to move forward can be more stable and smooth.

The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.

In order to make it easier for those skilled in the art to understand the improvement of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and in order to clarify, some other elements have been omitted from this document, those skilled in the art should recognize that these omitted elements may also constitute the content of the present invention.

Claims

1. The built-in expansion screw of nut, including screw rod (1), nut (2) and sleeve pipe (3), its characterized in that: the rear end of the sleeve (3) is closed, the front end of the sleeve is used for inserting the screw rod (1), the nut (2) is arranged at the rear part in the sleeve (3), the cross section of the nut (2) is polygonal, the inner wall surface of the rear part of the sleeve (3) is matched with the outer wall surface of the nut (2) so as to limit the rotation of the nut (2), the rear end of the screw rod (1) is inserted into the nut (2) and is in threaded connection with the nut (2), a plurality of elastic locking sheets (4) which are bent towards the inner cavity of the sleeve (3) are arranged on the wall surface of the sleeve (3) positioned on the front side of the nut (2), the front end of the elastic locking piece (4) is provided with a hook-shaped part (4 a) which can be locked by rotating the screw rod (1), the nut (2) can move forward to push against the elastic locking sheet (4), thereby expanding the elastic locking piece (4) and extending the hook-shaped part (4 a) from the sleeve (3).

2. The nut internal expansion screw according to claim 1, characterized in that: the elastic locking piece (4) and the sleeve (3) are of an integrated structure, and one end of the hook-shaped part (4 a) is also provided with a tooth-shaped structure.

3. The nut internal expansion screw according to claim 2, characterized in that: the number of the elastic locking pieces (4) is at least four, and each elastic locking piece (4) is uniformly arranged on the sleeve (3) at intervals along the ring shape.

4. The nut internal expansion screw according to claim 1, characterized in that: the screw (1) comprises a head part, a rod part matched with the inner diameter of the sleeve (3) and a thread part inserted into the nut (2).

5. The nut internal expansion screw according to claim 4, characterized in that: a spring washer (5) and a flat washer (6) are further arranged between the head of the screw rod (1) and the front end face of the sleeve (3), the spring washer (5) is located between the head of the screw rod (1) and the flat washer (6), and the flat washer (6) is located between the spring washer (5) and the front end face of the sleeve (3).

6. The nut internal expansion screw according to any one of claims 1 to 5, wherein: and the outer edge of the front end face of the nut (2) is provided with a chamfer.