Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1983-08-04
1986-03-18
Dorner, Kenneth J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
F16B 3302
Patent
active
045765340
ABSTRACT:
A screw for soft material having an assymetrical thread form which includes an upper flank comprised of a plurality of continuous helical surfaces. The upper flank surfaces are configured such that a helical protrusion is formed on the upper flank which causes increased friction between the screw and the workpiece only after seating of the screw head has occurred.
REFERENCES:
patent: Re3941 (1870-04-01), Pierce
patent: 1451484 (1923-04-01), Woodward
patent: 2301181 (1942-11-01), Ilsemann
patent: 2788046 (1957-04-01), Rosan
patent: 3207023 (1965-09-01), Knohl
patent: 3426820 (1969-02-01), Phipard
patent: 3653241 (1972-04-01), Orlomoski
patent: 4273175 (1981-06-01), Capuano
Barth Gerald D.
Wagner David P.
Buckman Thomas W.
Dorner Kenneth J.
Illinois Tool Works Inc.
Roche David I.
Whitcomb, Jr. Adrian H.
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