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United States of America Patent
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May 17, 1994
Grant Date -
N/A
app pub date -
Jun 15, 1993
filing date -
Sep 4, 1992
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A spiral member for improving the grip of screws in wooden or other receptive substrates is disclosed. The spiral member has a central axial drive pin by which it can be driven into a thread in the receptive substrate, and it has an improved cross section providing wings or protuberances extending out past the side surfaces of the cross section. The spiral member also has an outwardly facing triangular apex which bites into the old thread while the wings bear upon the flanks of the screw thread of the screw that inserted into the spiral member, thereby improving the grip.
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