Winged drill screw

Details Winged drill screw Winged drill screw

1989-07-06

1991-09-10

Wilson, Neill R.

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

408224, F16B 2500

Patent

active

050469053

ABSTRACT:
A self-drilling and thread forming fastener for fasting a first softer workpiece, such as wood, to a second harder workpiece, such as metal, is described. The fastener features wings of improved configuration including positive angle of attrack, positive cutting edge relief angles, teardrop-like crescent shape across section and knife-like cutting edge which exhibit faster drill times through wood.

REFERENCES:
patent: 3395603 (1968-08-01), Skierski
patent: 3916757 (1975-11-01), Wilson
patent: 4028987 (1977-06-01), Wilson
patent: 4347027 (1982-08-01), Brindle
patent: 4480951 (1984-11-01), Regensburger
patent: 4645396 (1987-02-01), McCauley et al.

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