Drill screw having cutting edges each forming an arc curving to

Details Drill screw having cutting edges each forming an arc curving to Drill screw having cutting edges each forming an arc curving to

1990-10-12

1991-12-24

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

408230, F16B 2500

Patent

active

050747290

ABSTRACT:
A drill screw is composed of a drill portion on a tip of the drill screw, a threaded portion succeeding to the drill portion and a head succeeding to the threaded portion whereby a ridge on the threaded portion threads into an inside wall of a hole the drill portion drills through a punctured object. The drill screw has cutting edges leading from both ends of a chisel positioned at the center of the tip of the drill screw. Each of the cutting edges forms an arc curving to a head side in an axial direction of the drill screw. Also, a shape of each of the cutting edges forms an arc curving to a back in a rotational direction of the drill screw.

REFERENCES:
patent: 3463045 (1969-08-01), Prescott
patent: 4125050 (1978-11-01), Schwartzman et al.
patent: 4209275 (1980-06-01), Kim
patent: 4407620 (1983-10-01), Shinjo
patent: 4529341 (1985-07-01), Greene

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