Title:
WASHER AND SCREWS WITH WASHERS
Document Type and Number:
Japanese Patent JP2020193654
Kind Code:
A
Abstract:
To provide a washer for making the fastening of screws difficult to be loosened, and screws with washers which are attached with the washers prevented from falling off.SOLUTION: Protrusions are formed at the outside of a shaft insertion hole being one surface of a front surface or a rear surface, or both the surfaces of a washer baseboard, an external peripheral part of a center part of the washer baseboard at the outside of the shaft insertion hole is curved so as to be warped to the front surface side or the rear surface side of the washer baseboard, the external peripheral part is horizontally or substantially-horizontally deformable by the fastening of screws such as bolts and nuts, the protrusions of the front surfaces can bite into, or pressure-contact with head part rear surfaces of the screws which are set, or can be engaged with the protrusions which are formed at head part rear surfaces of the screws, and the protrusions of the rear surfaces can bite into, or pressure-contact with a connecting member by the fastening rotation of the screws. One or two pieces of washers are attached to the head part rear surfaces of the screws such as the bolts and the nuts so as to be prevented from falling-off, and the washers are made to be the washers of this invention.SELECTED DRAWING: Figure 2
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Inventors:
NAKAJIMA KAZUO
Application Number:
JP2019099002A
Publication Date:
December 03, 2020
Filing Date:
May 28, 2019
Export Citation:
Assignee:
MARUNAKA KK
International Classes:
F16B43/00; F16B39/24; F16B39/26; F16B39/282
Domestic Patent References:
| JPS548255A | 1979-01-22 | |||
| JPS5121068U | 1976-02-16 | |||
| JP2011220387A | 2011-11-04 | |||
| JPS514446A | 1976-01-14 |
Attorney, Agent or Firm:
Masahide Kobayashi
Masaharu Kobayashi
Masaharu Kobayashi