Title:
TAPPING SCREW
Document Type and Number:
WIPO Patent Application WO/2012/160619
Kind Code:
A1
Abstract:
[Problem] To provide a tapping screw exerting an excellent anti-loosening effect with regard to a workpiece formed from a soft material such as resins and aluminum alloys. [Solution] A tapping screw (1) having a shaft part (3) and a normal screw thread (10) formed on the circumferential surface of the shaft part (3), wherein clearance grooves (20) are formed on the normal screw thread (10) by cutting out the tops of the normal screw thread (10), and an engaging protrusion (30) is formed on the bottom surface (21) of each clearance groove (20) along the entire edge connected to the flank plane (11) of the normal screw thread (10) or along a portion of the aforementioned edge. This tapping screw (1) exerts an excellent anti-loosening effect even when a workpiece expands, contracts or oscillates because the engaging protrusions (30) cut into the excess thickness of the workpiece which cut into the clearance grooves (20).
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Inventors:
HAMANO SINNICHI (JP)
NISHIMURA NAOKI (JP)
KOWADA KINYA (JP)
UEBA KAZUHIRO (JP)
NISHIMURA NAOKI (JP)
KOWADA KINYA (JP)
UEBA KAZUHIRO (JP)
Application Number:
PCT/JP2011/061627
Publication Date:
November 29, 2012
Filing Date:
May 20, 2011
Export Citation:
Assignee:
NITTO SEIKO KK (JP)
HAMANO SINNICHI (JP)
NISHIMURA NAOKI (JP)
KOWADA KINYA (JP)
UEBA KAZUHIRO (JP)
HAMANO SINNICHI (JP)
NISHIMURA NAOKI (JP)
KOWADA KINYA (JP)
UEBA KAZUHIRO (JP)
International Classes:
F16B25/02; F16B25/06; F16B33/02; F16B39/30
Domestic Patent References:
| WO2010092817A1 | 2010-08-19 |
Foreign References:
| JPH10103321A | 1998-04-21 | |||
| JP2002106539A | 2002-04-10 | |||
| JP2006057801A | 2006-03-02 | |||
| JP2002523691A | 2002-07-30 | |||
| JP2010133528A | 2010-06-17 | |||
| JP3290362B2 | 2002-06-10 |
Other References:
See also references of EP 2700829A4
Download PDF:
Claims: