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
Patent
1984-10-31
1986-05-06
Dorner, Kenneth J.
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
F16B 2500
Patent
active
045868620
ABSTRACT:
Drilling screw comprising a threaded shank and a drill section extending axially from the shank and having a plurality of vertical flat walls, parallel edges and inclined edges formed on the vertical flat walls, protrudent blocks formed respectively by three flat inclined faces and a relief face respectively at the rear of the vertical flat walls, and V-shaped straight flutes formed between the vertical flat walls and adjacent faces of the inclined flat faces. The drill section is formed by all of the flat faces and the cutting edges are provided on the flat vertical walls.
REFERENCES:
patent: 3517581 (1970-06-01), Stokes et al.
patent: 3710676 (1973-01-01), Ringland
patent: 3779664 (1973-12-01), Caley et al.
patent: 4125050 (1978-11-01), Schwartzman et al.
patent: 4222689 (1980-09-01), Fujiwara
patent: 4407620 (1983-10-01), Shinjo
Dorner Kenneth J.
Lindsey Rodney M.
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