Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1993-10-25
1995-09-05
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411411, 411426, F16B 3504
Patent
active
054474019
ABSTRACT:
A fastener is formed with an elongated threaded portion defined by a central shank and a thread formed on the shank, a neck collinear with the shank, and a head provided with a recess adapted to receive a tool for rotating the fastener. The shank of the threaded portion includes a cylindrical body and a tapered penetrating point extending longitudinally from the body. The thread is provided with a constant diameter section along the cylindrical body and a tapered section along the tapered penetrating point. The constant diameter section defines a major diameter that is more than about double the minor diameter defined by the body of the shank. The thread defines a pitch greater than the cross-sectional thickness of the thread along the shank so that the cylindrical shank is exposed within each pitch of the thread.
REFERENCES:
patent: 438754 (1890-10-01), Rogers
patent: 471179 (1892-03-01), Jones
patent: 4231247 (1980-11-01), Haydon
patent: 4536117 (1985-08-01), Yamashiro
patent: 4878792 (1989-11-01), Frano
patent: 5149032 (1992-09-01), Jones et al.
patent: 5205694 (1993-04-01), Nagoshi et al.
Iron Age Periodical, "A New Screw" by The American Screw Co., p. 203 date-Feb. 2, 1888.
Davis Glenn A.
Jones Stephen W.
McCormick David D.
Rohrs Donald L.
TerMeer James D.
Jasco, Inc.
Wilson Neill R.
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