Screw for fastening wooden materials
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United States of America Patent
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-
Mar 23, 2010
Grant Date -
Jun 25, 2009
app pub date -
Aug 11, 2008
filing date -
Dec 24, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A screw includes a shank portion including a tapered bottom section having a tip, a head on top of the shank portion, and first and second helical threads. The first helical thread extends helically around the shank portion in a first direction between the tip and the head, and has a first end distal from the head, and a second end opposite to the first end. The second helical thread extends helically around the shank portion in a second direction between the first helical thread and the tip, and has a third end proximate to the second end of the first helical thread. The first and second directions are opposite to each other. A non-helical ridge extends around the shank portion between the first and second helical threads.
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