Title:
COMBINATION OF SCREW AND DRIVER BIT AND HEADER PUNCH FOR SCREW MANUFACTURING
Document Type and Number:
Japanese Patent JP2017057962
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a screw capable of attaining a smooth and fast fitting of the screw to a bit fitting groove and capable of performing an effective and positive prevention of occurrence of burr-shaped deformation protrusions at a crossing edge of the bit fitting groove due to stress concentration at the bit fitting groove portion of the screw when a screw fastening work is carried out, a driver bit adapted for this screw and a header punch for manufacturing the screw.SOLUTION: This invention provides a screw (10) forming a bit fitting groove (12) composed of a cross groove at a top surface of a screw head (11a) and forming a slant opening groove part (18) expanding outwardly by a requisite width and inclined downward slightly deep to face toward a center part of a screw axis along a full opening edge of the cross groove at the top surface of the screw head and provides a driver bit adapted for this screw and a header punch for manufacturing the screw.SELECTED DRAWING: Figure 1
Inventors:
TOTSU KATSUYUKI
Application Number:
JP2015184759A
Publication Date:
March 23, 2017
Filing Date:
September 18, 2015
Export Citation:
Assignee:
TOTSU KATSUYUKI
International Classes:
F16B23/00; B25B15/00
Attorney, Agent or Firm:
Honda Takashi