Mushroom-compaction and asymmetric-thread impact-drivable screw
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United States of America Patent
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Mar 22, 2016
Grant Date -
Aug 27, 2015
app pub date -
Feb 25, 2014
filing date -
Mar 20, 2007
priority date (Note) -
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Abstract
An asymmetric thread impact drivable screw and clip for use with a power impact device for penetrating wood fibers while minimizing cut fibers. The screw includes an impact head and a conical shaped tip having a ballistic insertion angle at the ends of a shank. The shank defines asymmetrical threads with an insertion flank having a long side at a slide angle peaking at a crest supported by a catch flank positioned at a grip angle. Varying tool accepting recess are taught for the head along with multiple thread sections. A mushroom compaction thread section is also taught.
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