Title:
SCREW WITH WASHER
Document Type and Number:
Japanese Patent JP2016156489
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To make screws be hardly loosened.SOLUTION: In screws with a washer set on a head back face of screws such as a nut and a bolt so that the washer does not slip off, two sheets of washers are set in a state of being superposed up and down at a root side of the head back face of the screws, an upper washer surface projection is a projection capable of biting into or being brought into pressure-contact with the head back face of the screws by fastening the screws, the upper washer back face projection and a lower washer surface projection have the chevron shape so that they are engaged with each other at any part in the circumferential direction of the washers to hardly move backward or not to move backward, and the lower washer back face projection can bit into or be brought into pressure-contact with a connection material.SELECTED DRAWING: Figure 1
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Inventors:
NAKAJIMA KAZUO
Application Number:
JP2015059799A
Publication Date:
September 01, 2016
Filing Date:
March 23, 2015
Export Citation:
Assignee:
MARUNAKA:KK
International Classes:
F16B39/24; F16B39/26; F16B43/00
Domestic Patent References:
| JP2006307965A | 2006-11-09 | |||
| JPS444010Y1 | 1969-02-14 | |||
| JP2004500519A | 2004-01-08 | |||
| JP356579Z1 | ||||
| JPH0738733U | 1995-07-14 | |||
| JPS58177618U | 1983-11-28 | |||
| JPS404373B1 |
Foreign References:
| WO2014133446A1 | 2014-09-04 | |||
| US3895663A | 1975-07-22 |
Attorney, Agent or Firm:
Masaharu Kobayashi
Masahide Kobayashi
Masahide Kobayashi
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