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Bolt

A technology of bolts and connecting bolts, applied in the directions of bolts, screws, nuts, etc., can solve the problems of broken connecting bolts, unloading of bolts, unloading of bolts, etc., to achieve the effect of high safety

Inactive Publication Date: 2015-07-01
LOCKN BOLT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The structures of the bolts disclosed in Patent Documents 1 and 2 are such that once fastened and jointing bolts and fastening bolts are fastened, the bolts cannot be removed from the connected parts as they are, but if If the fastening bolt is tightened with a force exceeding the required torque, the bolt shaft of the fastening bolt may be damaged and the bolt may be removed from the connected parts.

Method used

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no. 1 approach

[0026] refer to figure 1 , the first embodiment of the bolt of the present invention will be described in detail.

[0027] figure 1 Middle (A) is the top view of the connecting bolt, figure 1 Middle (B) is the front view of the connecting bolt, figure 1 Middle (C) is a cross-sectional view of the bolt, figure 1 Middle (D) is a partially cutaway side view showing the state in which the bolt is fastened to the connected member.

[0028] The bolt A of the first embodiment of the present invention is composed of a fastened and jointing bolt 1 , a fastening bolt 2 , and a locking portion 3 provided at the lower end portion of a fastening bolt 2 of a fastening shaft 22 .

[0029] Such as figure 1 As shown in (D), the connecting bolt is screwed with the two fastened and joined members P, Q, and once fastened with the fastened bolt, the two fastened and joined members P, Q are connected.

[0030] Such as figure 1 The front view of (B), figure 1 As shown in the sectional view i...

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Abstract

A bolt capable of fastening without use of a special tool and which is extremely hard to be loosened (detached) after fastening is provided. A bolt of the present invention is configured by a fastened bolt, a fastening bolt, and a lock portion. A first engagement portion is provided on one end of a fastened bolt shank, and a concave portion is provided in the center part of the bolt shank. The fastening bolt has a second engagement portion on the surface confronting the first engagement portion and a fastening shank which is slidably inserted into the concave portion. The bolt is configured so that when the fastening bolt is turned in only one direction, the first engagement portion and the second engagement portion are engaged to turn the fastened bolt, but when the clamp load rotating the fastened bolt in only one direction reaches a predetermined torque, the lower strength portion is damaged so that the clamp load of the fastening bolt is not transferred to the fastened bolt.

Description

technical field [0001] The invention relates to a bolt screwed to a connected part, in particular to a bolt which is extremely difficult to be removed from the connected part once screwed to the connected part. Background technique [0002] It has been proposed to connect (fastened and jointed) two or more connected parts, such as various bolts that are difficult to remove from the connected parts in order to prevent theft, for example, to install the number plate on the vehicle bolts, bolts for installing the groove cover on the U-shaped groove, etc. But known bolts all have advantages and disadvantages, and there is still room for improvement. [0003] The inventors of the present invention also proposed the bolts shown in Patent Documents 1 and 2 first. [0004] The structures of the bolts disclosed in Patent Documents 1 and 2 are such that once fastened and jointing bolts and fastening bolts are fastened, the bolts cannot be removed from the connected parts as they are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B39/28F16B41/00
CPCF16B31/027F16B39/28F16B41/00F16B23/0076F16B23/00F16B35/00F16B35/002
Inventor 长谷川贤司
Owner LOCKN BOLT
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