Title:
WASHER
Document Type and Number:
WIPO Patent Application WO/2019/198649
Kind Code:
A1
Abstract:
Provided is a washer with which frictional force with respect to a female screw hole or a nut can be improved, thereby preventing to a high degree the loosening of a screw, while retaining the advantages of a flat washer and a spring washer and having a simple configuration. This washer 1 is characterized by comprising a main body portion 1a having a dome-shaped appearance, with a screw insertion hole 2 being formed in the main body portion 1a, the main body portion 1a being formed of a spring material that can be deformed into a substantially flat plate shape by means of pressing force in the vertical direction, and formed so as to be inclined in one direction when deformed into a plate shape.
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Inventors:
YAMASHITA TOSHIFUMI (JP)
MAEHARA MASAKAZU (JP)
MAEHARA MASAKAZU (JP)
Application Number:
PCT/JP2019/015235
Publication Date:
October 17, 2019
Filing Date:
April 07, 2019
Export Citation:
Assignee:
MATSUMOTO LLC (JP)
International Classes:
F16B43/00
Domestic Patent References:
| WO2014136878A1 | 2014-09-12 |
Foreign References:
| JPS4521933Y1 | 1970-09-01 | |||
| JPH0266436A | 1990-03-06 | |||
| JPH0118305B2 | 1989-04-05 | |||
| JPS4621130B1 | 1971-06-15 | |||
| JPS63104702A | 1988-05-10 | |||
| JPS4524733B1 | 1970-08-17 | |||
| JP2006307963A | 2006-11-09 |
Attorney, Agent or Firm:
MORITA Miki (JP)
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