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
1980-11-28
1983-10-04
Wolfe, Robert L.
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
044076207
ABSTRACT:
A drill screw comprises an elongated threaded stem having a driving head at one end and a drill bit at the opposite end, the drill bit having a pair of axially extending flutes located oppositely with respect to the axis of the stem, each of the flutes having a cutting surface which is deviated from the axis, each of the cutting surfaces having an inwardly concave bottom with respect to an imaginary reference plane deviated from the axis but extending in parallel therewith, the cutting surface including a cutting edge formed by its front edge and a cutting blade formed by its side edge, wherein the cutting edge and blade are on the reference plane, and each of the cutting edge and blade having a rake formed by the cutting surface.
REFERENCES:
patent: 3241426 (1966-03-01), Gutshall
patent: 3395603 (1968-08-01), Skierski
patent: 3463045 (1969-08-01), Prescott
patent: 3710676 (1973-01-01), Ringland
patent: 3738218 (1973-06-01), Gutshall
patent: 3789725 (1974-02-01), Lindstrom
patent: 4125050 (1978-11-01), Schwartzman
Wolfe Robert L.
Yugen Kaisha Shinjoseisakusho
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