Title:
SCREW FOR CONCRETE
Document Type and Number:
Japanese Patent JP2018119670
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a screw for concrete, prevented from being oblique when being screwed, and facilitating screwing.SOLUTION: A screw for concrete includes a head 31, and a shank 32 extending from the head 31 and having a tip as a chamfer part 321. In the shank 32, a single first screw thread 33 extending in a spiral form, a double second screw thread 34, and a single third screw thread 35 are provided. The first screw thread 33 has a plurality of notches 333, and a fillet-like part where a place in which a leading side flank 331 of the first screw thread 33 and the peripheral surface of the shank 32 are abutted is formed on a recessed arc surface, and a proceeding side flank angle and a leading side flank side are unequal angles. The second screw thread 34 is formed so as to be in parallel with each other and be placed at an interval from the first screw thread 33. The third screw thread 35 is formed so as to extend continuously from a side near the chamfer part 321 of the first screw thread 33 and make a cross section outside shape in a circular arc-shape.SELECTED DRAWING: Figure 3
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Inventors:
RIN SHOI
Application Number:
JP2017052487A
Publication Date:
August 02, 2018
Filing Date:
March 17, 2017
Export Citation:
Assignee:
KWANTAX RES INC
International Classes:
F16B33/02; E04B1/48; F16B25/04; F16B35/00
Attorney, Agent or Firm:
Patent Business Corporation Unias International Patent Office
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