Hole-forming and thread-forming screw
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United States of America Patent
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-
Jan 8, 2013
Grant Date -
Dec 17, 2009
app pub date -
Jul 23, 2007
filing date -
Jul 26, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A hole-forming and thread-forming screw for screwing into a sheet piece, including a slotted screw head for accommodating a tool, a threaded shank and a tapering hole-forming part having outer sides with a continuous convex-shaped curve along an entire length thereof, ribs running like threads along the hole-forming part being provided. The hole-forming part ends in a rounded, blunt end piece, and the rounded ribs, which chiplessly displace the material of the sheet part, are situated symmetrically opposite one another and have a pitch that is a multiple of the thread pitch.
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