Title:
WASHER, NUT, BOLT, AND LOCKING STRUCTURE FOR SAID SCREW PARTS
Document Type and Number:
WIPO Patent Application WO/2015/118669
Kind Code:
A1
Abstract:
This washer is provided with a through hole at the center, is provided with a plurality of radial washer protrusions in the peripheral direction of the obverse surface thereof, the washer protrusions can mesh with a plurality of head protrusions formed radially in the peripheral direction of the reverse surface of the head of a nut or the reverse surface of the head of a bolt, and after the tightening of the nut or bolt the meshing is caused not to loosen. The washer protrusion has a mountain shape provided with a ridge line section at the intersection of the two planes that are a climb-over inclined surface and a locking surface, the climb-over inclined surface is closer in the direction of tightening rotation of the nut or bolt compared to the ridge line section and has a moderate rising inclination in the direction of tightening rotation, the locking surface is at the leading side in the direction of tightening rotation of the nut or bolt compared to the ridge line section and is a perpendicular surface or a sharply inclined surface compared to the climb-over inclined surface, and the ridge line section has an arced surface shape (R-surface shape) or a planar shape.
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Inventors:
NAKAJIMA ICHIO (JP)
Application Number:
PCT/JP2014/052959
Publication Date:
August 13, 2015
Filing Date:
February 07, 2014
Export Citation:
Assignee:
MARUNAKA KK (JP)
International Classes:
F16B39/24
Foreign References:
| JP2006307965A | 2006-11-09 | |||
| JPH07173878A | 1995-07-11 | |||
| JP2007162773A | 2007-06-28 |
Attorney, Agent or Firm:
KOBAYASHI, Masaharu et al. (JP)
Shoji Kobayashi (JP)
Shoji Kobayashi (JP)
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