Title:
WASHER, NUT, BOLT, NUT WITH WASHER AND BOLT WITH WASHER
Document Type and Number:
Japanese Patent JP2017115934
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To prevent engagement between washer protrusions and head protrusions of screws or the like such as washers, nuts, and bolts from being loosened.SOLUTION: This invention relates to screws such as a washer 1, nuts, bolts, nuts with washers and bolts with washers in which many washer protrusions 6 are arranged in a radial manner in a surface peripheral direction of a washer 1, the washer protrusions 6 can be engaged with many head protrusions formed in a radial manner in a peripheral direction at the head part rear surface of a nut or the head part rear surface of a bolt, and after fastening of the nut or the bolt, the engaged state is hardly loosened or not loosened. The washer protrusions 6 of the washer 1, the head protrusions of the nut or the bolt have ridge line parts at a rising crossing part between the riding-over slant surface, engagement surface and both surfaces and a valley part at a descending crossing part, they are continuous mountain-shaped or wave-shaped forms as seen from a side elevational view, the riding-over slant surfaces are placed before the fastening rotating direction of the nut or the bolt than the ridge line part, and the engagement surface is present at a leading side in a fastening rotating direction of the nut or the bolt, the engagement surface is present at a leading side of the fastening rotating direction of the nut or the bolt rather than the ridge line part.SELECTED DRAWING: Figure 1
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Inventors:
NAKAJIMA KAZUO
Application Number:
JP2015250115A
Publication Date:
June 29, 2017
Filing Date:
December 22, 2015
Export Citation:
Assignee:
NAKAJIMA KAZUO
MARUNAKA:KK
MARUNAKA:KK
International Classes:
F16B39/24; F16B35/00; F16B43/00
Domestic Patent References:
| JP2006220210A | 2006-08-24 | |||
| JP2007504409A | 2007-03-01 | |||
| JP2011038596A | 2011-02-24 | |||
| JPS6386103U | 1988-06-06 | |||
| JP2015072056A | 2015-04-16 | |||
| JPH09170616A | 1997-06-30 |
Foreign References:
| WO2015118669A1 | 2015-08-13 |
Attorney, Agent or Firm:
Masaharu Kobayashi
Masahide Kobayashi
Masahide Kobayashi
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