Title:
SCREW OR BOLT FASTENING STRUCTURE AND SCREW
Document Type and Number:
Japanese Patent JP2020109306
Kind Code:
A
Abstract:
To provide a screw or bolt fastening structure and a screw, which can easily and certainly fasten a screw or a bolt to a member to be fastened made from a leather material, a synthetic leather material and the like, and can securely adhere the screw or the bolt after fastening.SOLUTION: A screw or a bolt is fastened to a member to be fastened by rotating in a rotation fastening direction along a circumferential direction around a shaft portion. On a seat surface, at least one projection portion is protrusively formed in the rotation fastening direction, and the projection portion is composed of a tapered portion descending and inclining from the seat surface in a direction opposite to the rotation fastening direction, and a cliff portion rising and inclining from a lower end of the tapered portion toward the seat surface. A descending and inclining angle of the tapered portion with respect to the seat surface is set to be smaller than the inclining angle at which the cliff portion rises toward the seat surface. When the screw or the bolt is rotated to a fastening end in the rotation fastening direction, the projection portion is pressed and fixed in the member to be fastened.SELECTED DRAWING: Figure 1
Inventors:
YOKOYA MASAAKI
Application Number:
JP2019000489A
Publication Date:
July 16, 2020
Filing Date:
January 07, 2019
Export Citation:
Assignee:
M&K YOKOYA CO LTD
International Classes:
F16B35/00; F16B35/04
Domestic Patent References:
| JP2000205229A | 2000-07-25 | |||
| JPS489856U | 1973-02-03 | |||
| JP2004011918A | 2004-01-15 | |||
| JP2001234917A | 2001-08-31 | |||
| JPS50148455U | 1975-12-09 | |||
| JP2002235723A | 2002-08-23 |
Foreign References:
| US5183359A | 1993-02-02 |
Attorney, Agent or Firm:
Katsushige Yamada
Tomoshige Yamada
Iwao Hirayama
Tomoshige Yamada
Iwao Hirayama