LOCKING SCREW PART

WIPO Patent Application WO/2012/070505

A1

The purpose of the present invention is to provide a novel locking screw part configured in such a manner that, without the use of a locking agent, the engaged portion of the locking screw part can be reliably prevented from loosening, that the locking screw part can be tightened with high strength, and that the locking screw part can be used repeatedly. The present invention is configured in such a manner that a male screw thread has provided on the clearance flank surface thereof a clearance-side protrusion protruding outward in the radial direction toward the clearance flank surface of a female screw thread, the clearance-side protrusion being configured in such a manner that the crest thereof interferes with the clearance flank surface of the female screw thread while the pressure flank surface of the male screw thread is in contact with the clearance flank surface of the female screw thread, and also in such a manner that, during screw tightening operation, the crest of the clearance-side protrusion is pressed against the pressure flank surface of the female screw thread and deformed by bending, the elastic restoring force of the protrusion imparts a predetermined contact surface pressure to the contact surfaces, and the contact surface pressure serves as resistance against loosening.

MORI SHIGETO (JP)
OKAMURA YOUSUKE (JP)
TOZAWA SHUNJI (JP)

PCT/JP2011/076706

May 31, 2012

November 18, 2011

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TOPURA KK (JP)
MORI SHIGETO (JP)
OKAMURA YOUSUKE (JP)
TOZAWA SHUNJI (JP)

F16B39/30

WO2009023166A2

2009-02-19

JPS4867656A	1973-09-14
JPS5076264U	1975-07-03
JP2006057801A	2006-03-02
JPS55155911A	1980-12-04
JP2004190713A	2004-07-08
JPH02101119U	1990-08-13
JPH1151032A	1999-02-23
JPH07139536A	1995-05-30

See also references of EP 2644912A4

SERA Kazunobu et al. (JP)
Kazunobu Sera (JP)

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