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Title:
LOCK FASTENING MEMBER OR LOCK WASHER
Document Type and Number:
Japanese Patent JP2014169793
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a lock fastening member or a lock washer capable of avoiding sag from being generated at a fastening portion by a fastening member for a bolt and a nut and at the same time capable of getting a more stable lock effect even in the case that a stronger vibrational shock is applied.SOLUTION: There is provided a tapered cylindrical part 11 integrally expanded at its diameter from a head part of a fastening member to a seat surface of a fastening member for a bolt 20 and a nut 30 or gradually expanded at its diameter from a press contacted surface 12 of a washer toward a seat surface 19 of washer, an inner peripheral surface 15 of the tapered cylindrical part is provided as a curved surface of which diameter is gradually expanded toward the seat surface of the fastening member or the seat surface of the washer. An outer peripheral surface 16 of the tapered cylindrical part is applied as a curved surface 16a in which the head part of the fastening member or the press contacted surface of the washer is concave. It is arranged such that the seat surface of the fastening member or the washer seat surface is applied as a raised surface 16b and a thickness of the raised surface in its fastening direction corresponds to a thickness of a flat plate washer.

Inventors:
YAMAZAKI TADATSUGU
Application Number:
JP2014103148A
Publication Date:
September 18, 2014
Filing Date:
May 19, 2014
Export Citation:
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Assignee:
YAMAZAKI ACTIVE KK
International Classes:
F16B39/24; F16B39/284; F16B43/00
Domestic Patent References:
JPS5138156U1976-03-22
JPH01105012A1989-04-21
JP2005207568A2005-08-04
JPH07167129A1995-07-04
JPH0842551A1996-02-13
Foreign References:
WO2008136109A12008-11-13
Attorney, Agent or Firm:
Yogo Kobayashi