Patent ID: 7883307
Filing Date: 2011-02-08
Classification: F16B

Abstract:
1. A self-drilling fastener hanging an object, comprising: an elongated body having an axis, a threaded exterior having a root, a proximal portion, an intermediate portion, a distal portion, and a drilling tip generally opposite said enlarged head; said proximal portion having an axial length and threads adapted for gripping a friable material, said threads having a root diameter, a crest diameter at least about twice said root diameter and a thread height; said intermediate portion having an axial length and threads adapted for gripping a member underlying said friable material, said member having a hardness greater than a hardness of said friable material, said intermediate portion threads having a crest diameter substantially smaller than said crest diameter of said proximal portion thread and a thread height substantially smaller than said thread height of said proximal portion thread; said distal portion having an axial length and threads for drilling into said member, a root that tapers toward said drilling tip, said distal portion threads having a crest diameter substantially smaller than said crest diameter of said proximal portion thread and a thread height substantially smaller than said thread height of said proximal portion thread; a flange proximate a rear end of said proximal portion thread, said flange having a diameter larger than said proximal portion crest diameter; and a head extending rearwardly from said flange, said head having an angled underside expanding outwardly from said flange toward a rear surface and a generally axially extending portion proximate said flange; wherein said generally axially extending portion has a diameter smaller than a largest diameter of said elongated body.