Patent ID: 7261505
Filing Date: 2007-08-28
Classification: F16B

Abstract:
1. A self-drilling anchor for use in a friable substrate comprising: a body having an axis, an axial bore for receiving a threaded elongated fastener, external threading, a flanged rear end, a front end, and a pair of diametrically opposed legs each axially extending from a pivot point proximate said flanged rear end to a distal end, there being a pair of diametrically opposed eyelets in said body between said legs at said pivot points; a coaxial nut having a bore generally coaxial with said bore of said body, a set of splines protruding radially into said bore of said nut for engaging said threaded fastener, and a pair of diametrically opposed wedges, each with a tip, positioned between said pair of legs, at least one of said wedges having an external thread portion thereon; and a generally flat V-shaped drill tip; said self-drilling anchor having an initial, driving mode wherein said tips of said wedges are joined with troughs located between said distal ends of said legs by a first plurality of lands and tips of said legs are joined with troughs located between said wedges by a second plurality of lands to form a generally cylindrical portion and to provide adequate support between said body and said nut as said anchor drills through said friable substrate, said thread portion of said at least one wedge is generally aligned with said external threading, and said generally flat V-shaped drill tip is presented forwardly of said distal ends; wherein said nut is adapted to be drawn rearwardly through said anchor to break said first plurality of lands and said second plurality of lands and pivot said pair of legs radially outwardly.