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Self-locking screw

A threaded and self-locking technology, used in threaded fasteners, screws, bolts, etc., can solve problems such as mechanical damage and weakening of the tightening effect.

Inactive Publication Date: 2013-09-25
RUIA GLOBAL FASTENERS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is often a large degree of mechanical damage to the relative position
In addition, misalignment of the head support, e.g. due to vibrations or due to temperature fluctuations, further reduces the fastening effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] figure 1 A three-dimensional view of a screw 10 with a head 12 and a shank 14 with an external thread 16 according to the invention is shown. According to the invention, protrusions 20 are provided on the tooth side of the thread that is stressed when the thread is tightened, this tooth side is also the tooth side 18 of the external thread 16 in this embodiment, and this tooth side is at the figure 1 The center is directed upwards, while the protrusion 20 extends over the limited bending portion of the respective thread turn into the thread turn. In the present embodiment, the protrusions 20 are each spaced approximately 120° apart, that is to say, one thread has three protrusions 20 . In total the protrusions cover approximately 1 / 3 of the full turn of the thread. The protrusions are designed to taper sharply in the direction of rotation and have a rounded tip, so that they arch with a circular arc-shaped cross section.

[0016] figure 2 A nut 100 according to the...

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PUM

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Abstract

The invention relates to a self-locking screw (16; 116) in which the flanks (18; 118) which are loaded when the screw (16; 116) is screwed are provided with an arched portion (20; 120).

Description

technical field [0001] The invention relates to a self-locking thread which can be used both as an external thread, eg in a screw or a bolt, and as an internal thread, eg in a nut. [0002] There is a great demand for self-locking threaded connections. Fastening elements according to the prior art often have chemical additives which pollute the environment and which only allow a single fastening action. Retightening with a new tightening action is not possible, retightening is only possible by using new screws or nuts. Background technique [0003] Other fastening elements of the prior art produce their fastening effect by increasing the head friction, for example by means of ribs on the workpiece-side lower surface of the screw head. However, there is often a large degree of mechanical damage to the relative position. In addition, misalignment of the head support, for example due to vibrations or due to temperature fluctuations, further reduces the fastening effect. Bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B39/30
CPCF16B39/30
Inventor 史蒂芬·艾斯波
Owner RUIA GLOBAL FASTENERS AG
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