Title:
SELF-TAPPING SCREW
Document Type and Number:
WIPO Patent Application WO/2012/147207
Kind Code:
A1
Abstract:
[Problem] To provide a self-tapping screw ideal for fastening work made of a soft material such as a resin or aluminum alloy. [Solution] A self-tapping screw (1): that is equipped with normal screw crests (10) and a female thread-forming screw crest (12) having a larger diameter than the normal screw crests (10); and in which one of the pitches between said normal screw crests (10) that are located on the head-ward side of the female thread-forming screw crest (12) is set to be larger than the other pitches. The self-tapping screw (1) provides a reduction in screwing torque together with an improvement of fastening strength, and can be used for various kinds of workpieces, from soft materials to hard materials.
Inventors:
TORII SHINGO (JP)
YOKOTA MASANORI (JP)
ABE MASANORI (JP)
YOKOTA MASANORI (JP)
ABE MASANORI (JP)
Application Number:
PCT/JP2011/060474
Publication Date:
November 01, 2012
Filing Date:
April 28, 2011
Export Citation:
Assignee:
NITTO SEIKO KK (JP)
TORII SHINGO (JP)
YOKOTA MASANORI (JP)
ABE MASANORI (JP)
TORII SHINGO (JP)
YOKOTA MASANORI (JP)
ABE MASANORI (JP)
International Classes:
F16B25/00
Foreign References:
| JPH09317732A | 1997-12-09 | |||
| JP2003206921A | 2003-07-25 | |||
| JP4490358B2 | 2010-06-23 | |||
| JP4490358B2 | 2010-06-23 |
Other References:
See also references of EP 2703658A4
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Claims: