Title:
BOLT
Document Type and Number:
Japanese Patent JP2021131145
Kind Code:
A
Abstract:
To provide a bolt of which fastening state can be readily checked.SOLUTION: A bolt 20 includes: a shank 21A; and a head 21B provided in one end of the shank 21A and formed with a recess part 21c, where a structural color part 22 for providing a structural color is provided in a bottom part 21d of the recess part 21c.SELECTED DRAWING: Figure 1
Inventors:
KAWACHI ISATO
AIKAWA KENJI
AIKAWA KENJI
Application Number:
JP2020027857A
Publication Date:
September 09, 2021
Filing Date:
February 21, 2020
Export Citation:
Assignee:
FUJIKIN KK
International Classes:
F16B35/00; F16B31/02; G01L5/00
Domestic Patent References:
| JP2006028202A | 2006-02-02 | |||
| JP2018040884A | 2018-03-15 | |||
| JP2019078982A | 2019-05-23 | |||
| JP2002236064A | 2002-08-23 |
Foreign References:
| WO2015075823A1 | 2015-05-28 | |||
| WO2016047122A1 | 2016-03-31 | |||
| CN110183703A | 2019-08-30 | |||
| US20150367107A1 | 2015-12-24 |
Attorney, Agent or Firm:
Yuji Yamashita