Punch for making such screw heads with slant rib

Details Punch for making such screw heads with slant rib Punch for making such screw heads with slant rib

1992-01-14

1993-04-20

Larson, Lowell A.

Threaded, headed fastener, or washer making: process and apparat

Apparatus for making externally threaded fastener or...

Screw fastener making

B21K 146

Patent

active

052037428

ABSTRACT:
A punch is provided for making a screw head with ribs on some of the driver surfaces. The punch includes a slanted groove for providing a rib which is slanted from the screw axis by a small angle between 1.degree. and 10.degree..

REFERENCES:
patent: 3108623 (1963-10-01), Muenchinger
patent: 3120012 (1964-02-01), Muenchinger
patent: 3238540 (1966-03-01), Muenchinger
patent: 3858261 (1975-01-01), Vozumi
patent: 3972083 (1976-08-01), Dreger
patent: 4151621 (1979-05-01), Simmons

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