Patent ID: 7934895
Filing Date: 2011-05-03
Classification: F16B,Y10T

Abstract:
1. A self drilling anchor system for use in a friable material having a thickness, comprising: a self-drilling anchor having an elongated body having an axis, an axial bore adapted to receive an elongated fastener, a flared end having torque transmitting surfaces therein, a proximal portion, an intermediate portion, a distal portion, and a drilling tip generally opposite said flared end, said drilling tip adapted for drilling into a member underlying said friable material, said member having a hardness greater than a hardness of said friable material; said proximal portion having threads for gripping said friable material having a crest diameter and a thread height; said intermediate portion proximate said proximal portion having a threaded exterior adapted for gripping a stud and having a root, a crest diameter substantially smaller than said crest diameter of said proximal portion, and a thread height substantially smaller than said thread height of said proximal portion; said distal portion having a drilling thread having a root that tapers toward said drilling tip and a lead proximate the drilling tip, a crest diameter substantially smaller than said crest diameter of said proximal portion, and a thread height substantially smaller than said thread height of said proximal portion, wherein said distal portion drilling thread continues onto said drilling tip; said proximal portion having a length approximately equal to said friable material thickness; wherein the combined length of said intermediate portion and said distal portion is greater than said friable material thickness and further wherein said proximal portion threads, said intermediate portion threads and said drilling thread have generally equal pitches; further comprising an elongated fastener for insertion into said axial bore of said self-drilling anchor.