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Patent Searching and Data


Title:
BOLT AND EXTRACTION TOOL
Document Type and Number:
WIPO Patent Application WO/2012/053250
Kind Code:
A1
Abstract:
Provided is a bolt capable of being tightened without using a special tool, incapable of being loosened after being tightened, but capable of being loosened in an emergency situation, and also provided is a tool. A bolt is configured, including: a fastening bolt having a through-hole formed at the shaft center, a serration surface formed at the upper surface of the head portion, and a tool engaging recess portion drilled at the center; a sliding shaft slidably inserted into the through-hole; a top rotational driving body fastened to the upper end portion of the sliding shaft and having a second serration surface that is formed on the lower surface and is to be engaged with the serration surface in a coaxial fashion; and a locking body attached to the lower end portion of the sliding shaft and restricting the movement of the shaft of a tightening bolt. The top rotational driving body has a step portion formed by reducing the diameter or a trench portion, which is formed on the side circumferential surface thereof, a tool engaging portion formed on the upper surface or on the side surface, and a recess portion formed on the upper surface and exposing the upper end surface of the sliding shaft.

Inventors:
HASEGAWA KENJI (JP)
Application Number:
PCT/JP2011/063665
Publication Date:
April 26, 2012
Filing Date:
June 15, 2011
Export Citation:
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Assignee:
HAMA SYSTEM CORP (JP)
HASEGAWA KENJI (JP)
International Classes:
F16B41/00; B25B27/18; F16B23/00; F16B35/00
Foreign References:
JP2009275714A2009-11-26
JP2009097707A2009-05-07
Attorney, Agent or Firm:
SATOH, TAKAHISA (JP)
Takahisa Sato (JP)
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Claims: