Fastener screw having improved installation and self-locking characteristics
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United States of America Patent
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-
Apr 6, 1993
Grant Date -
N/A
app pub date -
Oct 9, 1991
filing date -
Oct 9, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fastener screw includes a head portion, an elongated shank and a multiple-lead thread formed on the shank opposite the head portion. The head portion has a generally planar end surface having a polygonal drive recess therein. A generally longitudinal chip relief slot is formed along the thread and defines a longitudinal thread profile cutting edge. The underside of the head portion is defined by a generally concave annular surface having a plurality of outwardly projecting serrations formed about its periphery which burr into the workpiece and effect a self-locking action therewith as the screw is threaded into the workpiece.
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Cited Art Landscape
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