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Automatic fastening screw

A screw, fastening technology, applied in the field of fixtures

Inactive Publication Date: 2017-05-17
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no relevant technical solution to solve this difficulty

Method used

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  • Automatic fastening screw
  • Automatic fastening screw
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The automatic fastening screw of the present invention has a hollow outer nail body 1, an external screw thread is arranged outside the outer nail body 1, a hollow outer nail cap 2 is arranged on the top of the outer nail body 1; Expansion piece 7, the upper end of expansion piece 7 is provided with V-shaped groove 9; Cooperate expansion piece 7 is provided with expansion groove 8 on outer nail body 1 side, can stretch out from expansion groove 8 when expansion piece 7 expands; Outer nail cap 2 and The hollow structure of the outer nail body 1 is also provided with a solid inner nail body 3, the bottom end of the inner nail body 3 has a protruding inner nail body tip 6, and the inner nail body tip 6 is facing the center of the V-shaped groove 9; the inner nail body The body tip 6 has a thread on the outside, and is rotatably fixed in the cavity of the outer nail body 1 by a nut 5 arranged in cooperation; There are nail slots for screwdrivers. The expansion sheet 7 is a...

Embodiment 2

[0020] The main part of this embodiment is the same as that of Embodiment 1, the difference is that the expansion sheet 7 is a cross-shaped sheet structure; the number of the expansion grooves 8 is four, and the installation positions are evenly distributed at an angle of 90 degrees to each other.

[0021] During use, the main working process of this embodiment is the same as that of Embodiment 1. The difference is that after the V-shaped groove 9 is broken, the upper edge of the cross-shaped expansion piece 7 will form four fixed thorns 10 distributed at an angle of 90 degrees to each other, and the fixing of the outer nail body 1 is more firm. There will be no slight rotation, and the fixed object is more difficult to loosen and fall off.

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Abstract

The invention relates to an automatic fastening screw provided with a hollow outer screw body. An outer thread is arranged on the outer screw body. A hollow outer screw cap is arranged on the upper portion of the outer screw body. An expansion sheet is arranged in a cavity of the outer screw body. A V-shaped groove is formed in the upper end of the expansion sheet. Expansion grooves are formed in the side face of the outer screw body in the manner of being matched with the expansion sheet so that the expansion sheet can stretch out of the expansion grooves during expanding. A solid inner screw body is further arranged in a hollow structure of the outer screw cap and the outer screw body, a convex inner screw body sharp end is arranged at the bottom end of the inner screw body, and the inner screw body sharp end right faces the center of the V-shaped groove. A thread is arranged on the outer side of the inner screw body sharp end, and the inner screw body sharp end is rotationally fixed in the cavity of the outer screw body through a nut arranged in a matched manner. The top end of the inner screw body is connected with the inner edge of the outer screw cap through a connecting key, and a screw groove used in cooperation with a screwdriver is formed in the top end of the inner screw body. The automatic fastening screw can be firmly fixed inside a fixed object, and loosening and falling off are not prone to happening on occasions where shaking often happens.

Description

technical field [0001] The invention relates to a fixing device, in particular to a screw. Background technique [0002] Present screw is the solid structure that has nail cap and nail body, is provided with screw thread outside nail, is used for the fixing of materials such as common woodworking, plastic steel, aluminum alloy. The current screw can be easily unscrewed after being fixed, but it is inconvenient to use in occasions that often shake and need to be permanently fixed. For example, when door and window handles are installed into wooden doors and windows, the door and window handles installed with existing screws are easy to loosen and fall off due to the frequent need to open and close the doors and windows. The main reason for the existing screw to loosen and fall off is that the screw body is slightly rotated under the situation of repeated shaking, so that the screw body gradually escapes from the nail hole. At present, there is a lack of relevant technical s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B35/00
CPCF16B35/00
Inventor 王璟
Owner CHINA JILIANG UNIV
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