CN203348260U

CN203348260U - Expansion screw

Info

Publication number: CN203348260U
Application number: CN 201320364206
Authority: CN
Inventors: 谈建兴
Original assignee: WUJIANG LILI JIANXING CASTING FACTORY
Current assignee: WUJIANG LILI JIANXING CASTING FACTORY
Priority date: 2013-06-25
Filing date: 2013-06-25
Publication date: 2013-12-18
Anticipated expiration: 2023-06-25

Abstract

The utility model discloses an expansion screw. Compared with a traditional expansion screw, the expansion screw is provided with a screw hole inside to achieve the expansion and fastening function. The expansion screw is overall made of metal, has the self-tapping function, meanwhile is an expansion body, and is simple in structure and easy to process, meanwhile, a plurality of V-shaped grooves are formed in the side face of the screw, the function of tapping is enhanced, the expansion degree of the screw is improved, the situation that expansion force is large to damage the screw is prevented, and the situation of damage due to the fact that screw expansion is too large or too small can be prevented. The value of whole screw length occupied by a circle hole with a through hole in the screw is also defined, and the expansion screw has good social benefits.

Description

A kind of swell fixture

Technical field

The utility model relates to a kind of swell fixture, belongs to the hardware field.

Background technique

Traditional swell fixture is realized expanding by a plastic shell or metallic case, but there is the low problem of the poor tightening force of durability in the swell fixture of plastics shell-type, and expansion of metal bolt structure more complicated, and above-mentioned two kinds of swell fixtures all do not have the function of self tapping.

The model utility content

The purpose of this utility model is: a kind of technological scheme that can overcome the above problems is provided.

The utility model is realized by the following method:

A kind of swell fixture, described screw comprises screw-tipped and nut end, and described swell fixture inside vertically is processed with a screw-like circle hole from the nut end to distance screw-tipped L, and described screw-like circle hole inwall is processed with screw thread.

As further innovation of the present utility model, described swell fixture is penetrated with some V-shaped grooves from screw-like circle hole inwall towards screw outer wall symmetry centered by screw axis, and the tip of described Type B groove is towards the screw bottom tip.

As further innovation of the present utility model, the tip of described V-shaped groove and screw-like circle hole bottom tip are on same level.

As further innovation of the present utility model, the nut top end face of described screw-like circle hole from the screw head of screw to screw is the flaring structure.

As further innovation of the present utility model, the diameter in described screw-like circle hole is L1, and the diameter of swell fixture is L2, and wherein the L1 of 2 times is less than L2.

beneficial effect

The utility model is with respect to traditional swell fixture, the utility model is the full-metallic material, swell fixture self plays the effect of self tapping, swell fixture itself is also Peng's integral body simultaneously, simple structure, processing is simple, have some V-shaped grooves in the side of screw simultaneously, strengthened the function of tapping, also improved the thermal expansion of screw, the mode expansive force is excessive causes the screw breakage, for preventing the screw excessive or too small breakage that causes of expanding, the screw that the utility model has also defined in screw fills the value that through hole circle hole accounts for whole screw length, has good social benefit. the accompanying drawing explanation

Fig. 1 is front view of the present utility model.

Fig. 2 is plan view of the present utility model.

In figure: 1, screw-like circle hole; 2, V-shaped groove.

Embodiment

Below in conjunction with accompanying drawing, be described further:

As shown in Figure 1 and 2, described screw comprises screw-tipped and nut end, and described swell fixture inside vertically is processed with a screw-like circle hole 1 from the nut end to distance screw-tipped L, and described screw-like circle hole 1 inwall is processed with screw thread; Described swell fixture is penetrated with some V-shaped grooves 2 from screw-like circle hole 1 inwall towards screw outer wall symmetry centered by screw axis, and the tip of described Type B groove is towards the screw bottom tip; The tip of described V-shaped groove 2 and screw-like circle hole bottom tip are on same level; The nut top end face of described screw-like circle hole 1 from the screw head of screw to screw is the flaring structure; The diameter in described screw-like circle hole 1 is L1, and the diameter of swell fixture is L2, and wherein the L1 of 2 times is less than L2; During use, first described swell fixture is screwed in, then by one with this swell fixture in the supporting plain screw screw-in of line.

Claims

1. a swell fixture, described screw comprises screw-tipped and nut end, it is characterized in that: described swell fixture inside vertically is processed with a screw-like circle hole from the nut end to distance screw-tipped L, and described round hole inwall is processed with screw thread.

2. a kind of swell fixture as claimed in claim 1 is characterized in that: described swell fixture is penetrated with some V-shaped grooves from screw-like circle hole inwall towards screw outer wall symmetry centered by screw axis, and the tip of described Type B groove is towards the screw bottom tip.

3. a kind of swell fixture as claimed in claim 2 is characterized in that: the tip of described V-shaped groove and screw-like circle hole bottom tip are on same level.

4. a kind of swell fixture as claimed in claim 1 is characterized in that: the nut top end face of described screw-like circle hole from the screw head of screw to screw is the flaring structure.

5. a kind of swell fixture as claimed in claim 1 is characterized in that: the diameter in described screw-like circle hole is L1, and the diameter of swell fixture is L2, and wherein the L1 of 2 times is less than L2.