Title:
SCREW, DRIVER BIT AND SCREW MANUFACTURING HEADER PUNCH
Document Type and Number:
Japanese Patent JP2018155366
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a screw capable of being fit to a bit fitting groove smoothly and promptly, and being prevented from providing concentrated stress onto a bit fitting groove portion during screw fastening work so that generation of a burr-like deformed projection is effectively and surely prevented at an interaction edge of the bit fitting groove, and a screw manufacturing header punch.SOLUTION: A screw comprises a bit fitting groove 12 consisting of a cross groove on a top surface of a screw head 11a. Along an opening edge of the cross groove on the top surface of the screw head, an opening groove part 20 is formed at an upper side of the opening edge, which outwardly expands with a required width and has an L-shaped cross section with a required depth. A recess 22 is formed in such a manner that a tip end face 14a oriented to a central part of the screw head on a boundary surface part 14 adjacent to the cross groove on an opening face of the bit fitting groove is directed to a bottom face of the opening groove part.SELECTED DRAWING: Figure 1
Inventors:
TOTSU KATSUYUKI
Application Number:
JP2017054051A
Publication Date:
October 04, 2018
Filing Date:
March 21, 2017
Export Citation:
Assignee:
TOTSU KATSUYUKI
International Classes:
F16B23/00; B23P19/06; B25B15/00