CN211667002U

CN211667002U - Expansion screw

Info

Publication number: CN211667002U
Application number: CN202020048702.8U
Authority: CN
Inventors: 李奇
Original assignee: Yuqi Industrial Co ltd
Current assignee: Yuqi Industrial Co ltd
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2020-10-13
Anticipated expiration: 2030-01-10
Also published as: TWM613018U; TW202126914A; TWI756988B; JP3231007U

Abstract

The utility model provides an expansion screw contains a first screw, one inserts and runs through the second screw of first screw and one and the reaming nut that combines with the second screw, the end of first screw can be compeled into with the reaming nut through the rotation of second screw to make the terminal expansion of first screw and reach the fixed effect of inflation, and when carrying out the rotating operation to the second screw, can not produce axial displacement for first screw, make the operation of whole expansion screw more quick, convenient, pleasing to the eye and safety.

Description

Expansion screw

Technical Field

The present invention relates to a structure for fixing a workpiece, and more particularly to an expansion screw which can be widely used on a wall or a plate and has a tightening and fixing effect.

Background

The expansion screw is a common workpiece that utilizes a tightening effect to enhance a fixing effect, and the presently known expansion screw mainly includes a sleeve, a screw rod that can penetrate into the sleeve, and a nut that is screwed onto the screw rod, and an end edge of the screw rod is formed with an enlarged end portion. In practice, a preliminary hole is drilled in the wall surface, and an expansion screw, which is not yet tightened, is inserted into the preliminary hole in such a manner that the end having the enlarged end portion extends into the preliminary hole. After the nut is further rotated, the screw rod moves axially outwards relative to the sleeve, and the bottom end of the sleeve is propped against the prepared hole by the expanding end part, so that the expansion screw can be stably fixed in the prepared hole.

However, in this implementation structure, there is a problem that the screw rod protrudes reversely, which means that the screw rod is axially displaced relative to the nut and the sleeve when rotating, and the screw rod is pushed against the operating tool after the screw rod is displaced and protruded, for example, the inner surface of the sleeve for rotating the nut collides with the nut, and the expansion screw can be assembled and disassembled only by using the sleeve with a larger depth, which is very inconvenient to use. Secondly, the protruding part of the screw rod relative to the screw cap after the screw rod is axially displaced has the problem of safety besides the problem of poor appearance.

There is also an expansion screw in the market, in which the screw rod does not displace during operation, wherein one means is that the screw rod is pressed towards the casing by being stopped when rotating in situ, so as to cause the casing to be stopped and pressed, twisted and deformed to arch, the expansion screw for extruding the casing deformation can only be used once except for poor structural strength, when the assembly operation needs to be carried out and the assembly operation needs to be carried out, the casing of the expansion screw is excessively twisted and damaged, and the assembly operation needs to be carried out and the disassembly operation needs to be carried out and the destructive stretching, so that the expansion screw is not suitable for being repeatedly used. In addition, the expansion screw is provided with a complex mechanism and assembly, so that the screw rod cannot be displaced, and when the number of the expansion screw assemblies is increased and the design is more complex, the bearing capacity and the structural strength which can be provided by the expansion screw are reduced, and the manufacturing cost is increased.

SUMMERY OF THE UTILITY MODEL

The main objective of the present invention is to provide an expansion screw to improve the problems of the background art, so that the expansion screw can be used more conveniently, and the complicated structure of the commercially available expansion screw can be simplified, and the proper structural strength can be maintained.

To achieve the above object, the present invention provides an expansion screw, comprising:

an expansion screw, comprising:

a first screw, one end of which is a first screw head, the other end of which is a first screw rod, the first screw rod is provided with a first external screw thread, the center of the first screw is provided with a through hole, and the tail end of the first screw rod is provided with at least two splits;

a second screw, one end of which is a second screw head, the other end of which is a second screw rod, the second screw rod is provided with a second outer screw thread, and the second screw rod penetrates into the through hole from the position of the first screw head to enable the second outer screw thread to correspond to the tail end of the first screw rod; and

and the reaming nut has one small diameter end and one large diameter end, and has one through inner screw hole combined with the second outer screw thread and the small diameter end facing the through hole for the second screw to be screwed into to expand the end of the first screw.

The expansion screw, wherein: the through hole is provided with a hole expanding area corresponding to the split, the hole expanding area is favorable for the hole expanding nut to be more smoothly forced into the through hole, and the thickness of the tail end of the first screw rod is reduced, so that the operation of the expansion screw is easier.

The expansion screw, wherein: the surface of the reaming nut is also provided with at least one anti-slip part.

The expansion screw, wherein: the anti-slip part is a convex rib which protrudes out of the surface of the reaming nut.

The expansion screw, wherein: the anti-slip part is an anti-slip convex line which protrudes out of the surface of the reaming nut.

The expansion screw, wherein: the anti-slip part is an anti-slip concave line sunken on the surface of the reaming nut.

The expansion screw, wherein: the tail end of the first screw rod is a smooth end, so that the first screw rod can be more easily placed into a working position, and the tail end of the first screw rod is implemented in a mode of being thinner and having a more elastic expansion effect.

When the second screw is screwed, the expansion screw can be in an expansion state to achieve the effect of tightening and fixing; otherwise, when the second screw is unscrewed, the reaming nut can be withdrawn from the through hole, and the expansion state of the expansion screw is released, so that the expansion screw can be taken down from the working position.

Compared with the prior art, the utility model discloses expansion screw can not have the reverse protruding problem of stretching of screw rod when the operation, also can not have structural damage and dismantle the problem that can not used repeatedly after. And can reach firm inflation fixed effect with simple structure, can effectively solve prior art's problem.

Drawings

FIG. 1 is an exploded perspective view of a preferred embodiment of the present invention;

FIG. 2 is a perspective view of the preferred embodiment of the present invention;

FIG. 3 shows a cross-sectional view of FIG. 2;

FIG. 4 is an enlarged partial schematic view of FIG. 3;

FIG. 5 is an external view of FIG. 4;

FIG. 6 is a schematic view of the expansion operation of the preferred embodiment of the present invention;

FIG. 7 is an enlarged partial schematic view of FIG. 6;

FIG. 8 is an external view of FIG. 7;

FIG. 9 shows an outer convex embodiment of the inventive reaming nut;

fig. 10 shows an embodiment of the inner concave pattern of the reaming nut of the present invention.

Description of reference numerals: 1-an expansion screw; 10-a first screw; 11-a first screw head; 12-a first screw; 121-a first outer thread; 122-smooth end; 13-a through hole; 131-a hole expanding region; 14-breach; 20-a second screw; 21-a second screw head; 22-a second screw; 221-second outer thread; 30-a reaming nut; 31-small diameter end; 32-large diameter end; 33-internal screw holes; 34-anti-slip part.

Detailed Description

Please refer to fig. 1, fig. 2 and fig. 3, which are an exploded perspective view, an assembled perspective view and a sectional view of a preferred embodiment of the present invention. The expansion screw 1 of the present embodiment mainly includes a first screw 10, a second screw 20 and a hole-expanding nut 30.

The first screw 10 has a first screw head 11 at one end and a first screw 12 at the other end, the first screw 12 has a first outer thread 121, a through hole 13 is formed in the center of the first screw 10, and at least two slits 14 are formed at the end of the first screw 12, the number of the slits 14 can be increased according to the requirement of the application specification in practical implementation, and the arrangement function is mainly to enable the end of the first screw 12 to have an obvious expansion effect. A hole expanding area 131 is arranged at the position of the through hole 13 corresponding to the split 14; the end of the first screw 12 is a smooth end 122, so that the first screw 12 can be easily placed in the working position, and the end of the first screw 12 is thinner and more elastically expandable.

The second screw 20 has a second screw head 21 at one end and a second screw 22 at the other end, the second screw 22 has a second outer thread 221, and the diameter of the second screw 22 is smaller than the diameter of the through hole 13. The second screw 22 is inserted into the through hole 13 from one end of the first screw head 11 such that the second outer thread 221 corresponds to the end of the first screw 12.

Referring to fig. 4 and 5, the reaming nut 30 has a small diameter end 31 at one end and a large diameter end 32 at the other end, and a through inner screw hole 33 is formed therein to be combined with the second outer screw thread 221, and the small diameter end 31 faces the through hole 13. The surface of the hole-expanding nut 30 is provided with at least one anti-slip part 34, which can prevent the hole-expanding nut 30 and the second screw 20 from rotating synchronously, and improve the pressing effect of the hole-expanding nut 30; the anti-slip portion 34 of the present embodiment is in the form of a convex rib to cooperate with the slit 14 to prevent the rotation of the broaching nut 30 and the second screw 20, and when the second screw 20 rotates, the anti-slip portion 34 is limited within the range of the slit 14, so that the broaching nut 30 cannot rotate freely and can move axially relative to the second screw 20.

Referring to fig. 6 to 8, when the second screw 20 is screwed, the counter-bore nut 30 is forced into the through hole to expand the end of the first threaded rod 12, so that the expansion screw 1 is in an expanded state to achieve the effect of tightening and fixing. Conversely, when the second screw 20 is unscrewed, the counter-bore nut 30 is withdrawn from the through-hole 13, and the expansion state of the expansion screw 1 is released, so that the expansion screw can be removed from the working position.

The provision of the enlarged hole region 131 facilitates the smooth forcing of the nut 30 into the through hole 13, and reduces the thickness of the end of the first screw 10, thereby facilitating the operation of the expansion screw.

Referring to fig. 9 and 10 in comparison with fig. 1, other embodiments of the nut 30 are respectively disclosed, in which the anti-slip portion 34 shown in fig. 9 is an outer convex pattern, and the anti-slip portion 34 shown in fig. 10 is an inner concave pattern, so as to prevent or reduce the rotation of the nut 30 during operation.

In summary, the implementation of the present invention can improve various problems of the background art, and is beneficial to the use and operation of the expansion screw 1, and even with a simple structure, the expansion screw can achieve a stable expansion fixing effect, and besides the structure is different from the background art, the expansion screw has an enhancement in efficiency in terms of production or operation of a user. The above-mentioned embodiments are illustrative of one of the best possible embodiments of the present invention with reference to the accompanying drawings, and do not limit the scope of the present invention.

Claims

1. An expansion screw, comprising:

2. The expansion screw of claim 1, wherein: the through hole is provided with a hole expanding area corresponding to the split.

3. The expansion screw of claim 1, wherein: the surface of the reaming nut is also provided with at least one anti-slip part.

4. The expansion screw of claim 3, wherein: the anti-slip part is a convex rib which protrudes out of the surface of the reaming nut.

5. The expansion screw of claim 3, wherein: the anti-slip part is an anti-slip convex line which protrudes out of the surface of the reaming nut.

6. The expansion screw of claim 3, wherein: the anti-slip part is an anti-slip concave line sunken on the surface of the reaming nut.

7. The expansion screw of claim 1, wherein: the end of the first screw is a smooth end.