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
1984-01-18
1986-07-08
Holko, Thomas 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
408228, F16B 2500
Patent
active
045990247
ABSTRACT:
A drill screw having an integral driving shank, head, and entering end portion. The shank has formed on it thread convolutions of uniform outer and root diameters. The entering end portion has a cylindrical portion coaxial with the shank provided with two flutes inclined with respect to the center axis of the cylindrical portion and disposed on opposite sides of it, and end surfaces of roof-shape. Each of the flutes includes conical flute surfaces. The intersection of each of the conical flute surfaces and each of the end surfaces forms a cutting edge. And each of the conical flute surfaces forms a rake angle with respect to one of the cutting edges, while each of the end surfaces forms a relief angle with respect to one of the cutting edges.
In a preferred construction each fluted surface is located outside or beyond a plane containing the center axis of the drill screw, and the fluted surfaces each have a vertex angle of 35.degree. to 54.degree..
REFERENCES:
patent: 3079831 (1963-03-01), Gutshall
patent: 3318182 (1967-05-01), Carlson
patent: 3395603 (1968-08-01), Skierski
patent: 3645641 (1972-02-01), Jae Sun Kim
patent: 3786713 (1974-01-01), Sygnator
patent: 3789725 (1974-02-01), Lindstrom
patent: 3827331 (1974-08-01), Muenchinger
patent: 4147088 (1979-04-01), Whittaker
Amano Tetsuo
Sano Nariaki
Brown Charles A.
Brown Charles E.
Holko Thomas J.
Kabushiki Kaisha Yamashina Seikosho
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