MUSHROOM COMPACTION AND ASYMMETRIC-THREAD IMPACT-DRIVABLE SCREW

摘要

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 acceptin g recess are taught for the head along with multiple thread sections. A mushroom compaction thre ad section is also taught.