Patent ID: 8864431
Filing Date: 2014-10-21
Classification: F16B

Abstract:
1. A screw capable of rapidly drilling and cutting comprising a shank, a head disposed at one end of said shank, a drilling portion disposed at the other end of said shank, and a plurality of threaded units spirally disposed around said shank; two inclined cutting planes being formed on said drilling portion and said two inclined cutting planes being connected at a cutting edge; wherein, a tapered positioning member extends outward from a convergence of said cutting planes for dividing said cutting edge into dual sub cutting edges; each sub cutting edge being disposed by an inclined angle; a first included angle formed by said sub cutting edges being less than 180 degrees; said first included angle of said sub cutting edges being different from a second included angle of a taper of said tapered positioning member, and wherein a blank area defined on said shank divides said threaded units into a first section and a second section; a first diameter of said blank area is larger than a second diameter of said shank but smaller than a third diameter of said threaded units.