Title:
SCREW COMPONENT
Document Type and Number:
WIPO Patent Application WO/2015/005347
Kind Code:
A1
Abstract:
Provided is a screw component having high strength and that is such that the seating surface is in complete close contact. The screw component is provided with a head (10) and a screw shaft (20) extending from the head (10), the screw shaft (20) being provided with a parallel screw section (22) at which a complete screw ridge is formed, a neck section (24) at which there is no screw ridge, a transitional screw section (26) at which, from the parallel screw section (22) towards the neck section (24), an incomplete screw ridge is formed of which the groove diameter is the same as the complete screw ridge and the ridge height gradually decreases, reaching the neck section, and an under-neck radiused section (28) provided to the corner section of the neck section (24) and the head section seating surface (11), and the screw component is characterized in that the diameter of the neck section (24) being work hardened by being narrowed thinner than the groove diameter of the parallel screw section (22).
Inventors:
MORI SHIGETO (JP)
NAKANO HIROSHI (JP)
OKAMURA YOSUKE (JP)
HOSHINO SEIYA (JP)
NAKANO HIROSHI (JP)
OKAMURA YOSUKE (JP)
HOSHINO SEIYA (JP)
Application Number:
PCT/JP2014/068197
Publication Date:
January 15, 2015
Filing Date:
July 08, 2014
Export Citation:
Assignee:
TOPURA KK (JP)
International Classes:
F16B31/06; F16B35/00
Domestic Patent References:
| WO2005011892A1 | 2005-02-10 |
Foreign References:
| JPH11125225A | 1999-05-11 | |||
| JP2002147425A | 2002-05-22 | |||
| JPS4813329Y | ||||
| JP2012101247A | 2012-05-31 |
Attorney, Agent or Firm:
SERA Kazunobu et al. (JP)
Kazunobu Sera (JP)
Kazunobu Sera (JP)
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