Title:
BOLT
Document Type and Number:
WIPO Patent Application WO/2022/085391
Kind Code:
A1
Abstract:
This bolt comprises a head part and a shaft part. An upper surface of the head part includes: a recessed section formed in the center of the head part and having a curved shape that is recessed downwards; and curved sections which are continuously connected to the recessed section, which are formed so as to rise from the recessed section towards the radial direction outer side of the same and thereafter fall, and which curve upwards in a protruding manner. The upper surface of the head part includes a plurality of types of the curved sections which have mutually different heights with respect to the recessed section.
Inventors:
YAMAMURA TAKEMI (JP)
Application Number:
PCT/JP2021/036219
Publication Date:
April 28, 2022
Filing Date:
September 30, 2021
Export Citation:
Assignee:
HELICODESIGN INC (JP)
International Classes:
F16B31/00; F16B35/00; F16B35/06
Foreign References:
| JPS4913816B1 | 1974-04-03 | |||
| EP2543896A1 | 2013-01-09 | |||
| JPS3532214Y1 | 1960-12-05 | |||
| JP2011530049A | 2011-12-15 |
Attorney, Agent or Firm:
INABA, Yoshiyuki et al. (JP)
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