Drill screw

Details Drill screw Drill screw

1985-12-30

1988-06-28

Wilson, Neill

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

408230, F16B 2500

Patent

active

047535628

ABSTRACT:
A drill screw is provided having a head, a male thread section and a drilling section. The screw includes a web on top of the drilling section, and the web has an elongated recess in its central portion. The recess splits the web into chisel edges each rising toward the respective ridges.

REFERENCES:
patent: 2479730 (1949-08-01), Dewar
patent: 2889725 (1959-06-01), Turton
patent: 3028773 (1962-04-01), Borneman
patent: 3079831 (1963-03-01), Gutshall
patent: 3204516 (1965-09-01), Wieber
patent: 3318182 (1967-05-01), Carlson
patent: 4114508 (1978-09-01), Jeal

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