Bolt

A bolt and screw technology, applied in the field of bolts in the crushed part, can solve problems such as damage to the thread surface of the internal thread, inability to place the bolt in place, and inability to fasten and connect.

Active Publication Date: 2022-02-01
AOYAMA SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the part used with low torque, the bolt cannot be seated at the target torque, and reliable fastening may not be possible.
In addition, there is a problem that the bulging part interferes with the internal thread due to its large size, and the bulging part bites into the thread surface of the internal thread after the bolt is seated, thereby causing large damage to the thread surface of the internal thread.

Method used

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Examples

Experimental program
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Embodiment Construction

[0023] Preferred embodiments of the present invention are shown below. figure 1 It is a front view of the bolt of the embodiment, figure 2 is its explanatory diagram. In these figures, 10 is the head of the bolt, and 11 is a standard thread formed on the shaft by roll forming. The standard threaded portion 11 is formed over the entire length of the shaft except for the lower head portion 12 and the shaft front end portion 13 . This bolt is a right-handed threaded bolt in which the standard threaded portion 11 is provided with a right-handed thread, and advances forward when turned to the right with respect to the internal thread. In addition, in the present embodiment, a concave portion for receiving a tool is formed on the head 10 , but the shape of the head 10 is arbitrary, and may be a normal hexagon. In addition, the shape of the shaft front end portion 13 is not particularly limited.

[0024] A crush portion 14 is formed on the thread of the standard thread portion ...

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PUM

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Abstract

Provided is an invention relating to a bolt having a crushed portion (14) of a ridge formed on a regular threaded portion (11) of the bolt. The crushed portion of the ridge is set to have a height at which no screwing torque is generated when the bolt is screwed into an internal thread, and the crushed portion of the ridge is formed on an entire half-circumference or a partial half-circumference of the regular threaded portion so as to form a spiral shape that advances toward a shaft tip (13) in a direction opposite to the ridge of the regular threaded portion when viewed from a head. The bolt of the present invention is used as a locking bolt or an earth bolt.

Description

technical field [0001] The present invention relates to a bolt having a crushed portion of thread threads formed on a standard thread portion of the bolt. Background technique [0002] So far, there are known many kinds of anti-loosening bolts. These anti-loosening bolts make the thread surface bulge by crushing the top of the thread ridge of the standard thread portion of the bolt, so that the bulge and the thread surface of the internal thread are formed. interference to prevent loosening. [0003] For example, Patent Document 1 describes an anti-loosening bolt in which crushed portions of thread threads are formed in four helical shapes on the peripheral surface of a standard thread portion. As in Patent Document 1 Figure 7 , Figure 8 As shown, the bulge formed on the top of the thread is configured to interfere with the thread surface of the female thread to prevent loosening. [0004] In addition, Patent Document 2 also describes an anti-loosening bolt in which cru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B39/30F16B39/28H01R4/66
CPCF16B39/30F16B39/28H01R4/66F16B2200/93
Inventor 宫崎源太郎
Owner AOYAMA SEISAKUSHO CO LTD
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