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SCREW

  • US 20130039720A1
  • Filed: 08/11/2011
  • Published: 02/14/2013
  • Est. Priority Date: 08/11/2011
  • Status: Abandoned Application
First Claim
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1. A screw, comprising:

  • a head including a wrench notch at the top to be wrenched by a screwdriver; and

    a cylinder rod which is extended from the head, including a tip at a distal end and a round thread spirally extended upward from the tip, the round thread being an asymmetry thread and including serrated cutting edges extended from the tip and formed along a circumference in a desired distance, the rod further including a cutting thread with a plurality of spiral cutting edges extended upward from the tip in the same spiral direction as that of the round thread, wherein the spiral cutting edges respectively have a spiral angle steeper than that of the round thread and intersect the round thread by at least two thread pitches, and wherein the cutting thread has an outer diameter smaller than that of the round thread.

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