Title:
TAPPING SCREW
Document Type and Number:
WIPO Patent Application WO/2015/098823
Kind Code:
A1
Abstract:
Upon considering that tapping screws to be screwed into steel materials and resin materials conventionally necessitate tapping screws of different screw-part shapes for each type of destination material, the present invention provides a tapping screw which, while maintaining the same screw-part shape, is capable of achieving sufficient fastening strength to a wide range of destination materials ranging from resin materials to metal materials, and is further capable of preventing loosening. A tapping screw for fastening while forming a female screw in a destination material by plastic deformation, the tapping screw being characterized in that the pressure-side flank surface (31) of the screw thread in at least the engaging section with the destination material is locally provided with a plurality of recesses (9) in the screw-diameter circumferential direction, while the outer diameter of a screw-thread peak section (33) of the screw thread (3) continuously maintains a cylindrical-helix shape.
Inventors:
MORI SHIGETO (JP)
TOZAWA SHUNJI (JP)
TOZAWA SHUNJI (JP)
Application Number:
PCT/JP2014/083881
Publication Date:
July 02, 2015
Filing Date:
December 22, 2014
Export Citation:
Assignee:
TOPURA KK (JP)
International Classes:
F16B25/06; F16B25/04; F16B39/30
Foreign References:
| JPS62156613U | 1987-10-05 | |||
| JPH09144733A | 1997-06-03 | |||
| JPS6179014U | 1986-05-27 | |||
| JPS57110811A | 1982-07-09 | |||
| JP2010133528A | 2010-06-17 | |||
| JP2002323015A | 2002-11-08 | |||
| JPH10299738A | 1998-11-10 |
Attorney, Agent or Firm:
SERA Kazunobu et al. (JP)
Kazunobu Sera (JP)
Kazunobu Sera (JP)
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