Self-drilling screw

Details Self-drilling screw Self-drilling screw

1977-01-10

1978-09-19

Britts, Ramon S.

Cutting by use of rotating axially moving tool

Tool or tool with support

Having inversely angled cutting edge

408228, F16B 2500

Patent

active

041145089

ABSTRACT:
A drill embodied in a self-drilling and self-tapping screw has a drill-point comprising a first sharp-pointed tip on the drill axis and a second sharp-pointed tip offset transversely of and axially behind the first tip. First and second cutting edges are inclined similarly to the axis on opposite sides thereof and have the first and second tips respectively at their respective leading ends.

REFERENCES:
patent: 3093028 (1963-06-01), Mathie
patent: 3207024 (1965-09-01), Sommer
patent: 3358548 (1967-12-01), Dyslin
patent: 3884117 (1975-05-01), Eager
patent: 3937120 (1976-02-01), Munse

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