Drill-coexistent screw

Details Drill-coexistent screw Drill-coexistent screw

1991-04-16

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

411304, 411369, 411915, F16B 2500

Patent

active

050747282

ABSTRACT:
A screw includes a drill point formed on a root portion of a threaded shank of the screw having a plurality of helix flutes helically formed in the screw emerging from the drill point through the threaded shank and a plurality of packing rings annularly secured on the shank so as for a firm fixation of the screw in a wall or article to be fastened without being pre-drilled by a drill tool.

REFERENCES:
patent: 3738218 (1973-06-01), Gutshall
patent: 4241639 (1980-12-01), Baer
patent: 4697969 (1987-10-01), Sparkes
patent: 4978350 (1990-12-01), Wagenknecht

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