Drill screw

Details Drill screw Drill screw

1975-01-28

1976-02-10

Britts, Ramon S.

F16B 2500

Patent

active

039371204

ABSTRACT:
A thread forming screw is disclosed having a pilot-drilling tip in which two longitudinal flutes are provided with generally flat and substantially coplanar radial walls defining side cutting edges. Forwardly inclined end portions of said walls terminate in end cutting edges displaced on opposite sides of said plane. The end cutting edges are backed by substantially flat receding walls. The side cutting edges are backed by convexly curved walls.

REFERENCES:
patent: 3079831 (1963-03-01), Gutshall
patent: 3125923 (1964-03-01), Hanneman
patent: 3395603 (1968-08-01), Skierski
patent: 3789725 (1974-02-01), Lindstrom

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