Tapping screw

Details Tapping screw Tapping screw

1986-10-14

1988-12-27

Gall, Lloyd A.

Expanded, threaded, driven, headed, tool-deformed, or locked-thr

Externally threaded fastener element, e.g., bolt, screw, etc.

Pilot end having means enhancing fastening or installation

408228, F16B 2502

Patent

active

047937564

ABSTRACT:
A tapping screw includes a screw head, a self-tapping thread portion and a drilling point. The drilling point has a pair of approximately axially extending flutes which are located diametrically opposite each other relative to the shank axis and include clearing surfaces and cutting surfaces. The cutting surfaces end in cutting edges facing the point of the screw and lateral outer knives. Immediately adjacent the cutting edges or cutting knives, the cutting surfaces have a convexly arched cross-sectional shape.

REFERENCES:
patent: 2165011 (1939-07-01), Rosenberg
patent: 3942406 (1976-03-01), Egner
patent: 4069730 (1978-01-01), Gutshall
patent: 4161132 (1979-07-01), Eklund et al.
patent: 4295768 (1981-10-01), Skierski
patent: 4407620 (1983-10-01), Shinjo
patent: 4679968 (1987-07-01), Tsujimura et al.

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