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Title:
緩み防止用ねじ山構造及びその加工工具
Document Type and Number:
Japanese Patent JP6469888
Kind Code:
B2
Abstract:
The present invention provides a looseness-prevention screw thread structure including a screw thread having a predetermined pitch, a no-load flank which is an inclined surface in a direction in which the screw thread is advanced, and a load flank which is an inclined surface in a direction in which the screw thread is retracted, the no-load flank and the load flank being formed at both sides of the screw thread, in which the no-load flank of the screw thread includes: a first tangential portion which abuts against an arc portion formed at a thread crest of an opposing fastening object; and a second tangential portion which has a preset angle with respect to the first tangential portion and abuts against the arc portion.

Inventors:
Seo Hyun Woo
Jang Won Bomb
Application Number:
JP2017554224A
Publication Date:
February 13, 2019
Filing Date:
January 05, 2016
Export Citation:
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Assignee:
DAE KWANG METAL.CO.LTD
International Classes:
F16B39/30; B21H3/04; B21H3/06; B23G5/04; B23G5/06; B23G5/18; B23G7/00; F16B33/02
Domestic Patent References:
JP59063213U
JP2008208983A
JP2004247Y2
JP2005140325A
JP2014037893A
JP2014206234A
JP2008519227A
JP5027916B2
JP2015010703A
JP55003566B2
Foreign References:
KR1020120136213A
US20120195713
Attorney, Agent or Firm:
Takuji Yamada
Mitsuo Tanaka
Hiroshi Okabe