Title:
COMBINATION OF SCREW WITH SCREWDRIVER BIT AND HEADER PUNCH FOR MANUFACTURING SCREW
Document Type and Number:
WIPO Patent Application WO2003002880
Kind Code:
B1
Abstract:
A combination of a screw with a screwdriver bit capable of effectively preventing the cam-out event of the screwdriver bit by improving the formation of a groove part in the cross groove of the screw so as to prevent the screw from being damaged and capable of remarkably increasing a working efficiency by always achieving an appropriate and rapid screw tightening operation even if the cross groove portion of the screw is damaged, and a header punch for manufacturing the screw, the header punch comprising the screw 30 having cutout step parts 36 of generally right triangle shape in cross section provided at the center parts of the tilted groove parts 32a of a bit fitted groove 32 formed in a cross groove at a screw head part 30a and a screwdriver bit 50 having projected parts 56 of generally triangle in cross section matching the cutout step parts formed at the center part of the tilted groove parts of the screw provided at the center part of the tilted end edge parts 52a of a flat-shaped blade part 52 and having the tip faces of the blade part 52 formed as conical projected parts 54.
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Inventors:
TOTSU KATSUYUKI (JP)
Application Number:
PCT/JP2002/006195
Publication Date:
March 06, 2003
Filing Date:
June 21, 2002
Export Citation:
Assignee:
TOTSU KATSUYUKI (JP)
International Classes:
B21K1/46; B25B15/00; F16B23/00; (IPC1-7): F16B23/00; B21K1/48; B25B15/00
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