Patent ID: 7367751

Claim:
A friction rock stabilizer comprising: an elongated metal tube having and interior and an exterior surface and including a distal end and a proximal end, said distal end being tapered, a flange located adjacent said proximal end, said tube further including a slit running substantially the entire length thereof, said tube being capable of being positioned within a bore formed in the wall of a mine; an internal sleeve located within and adjacent said distal end of said interior of said tube, said sleeve being moveable within said tube, and tapered expander means located within said interior of said tube adjacent said distal end, said tapered expander means being actuatable from said proximal end after said stabilizer is installed in a bore to expand said sleeve and said distal end of said tube so as to firmly anchor said stabilizer in said bore, wherein said tapered expander means is circular in cross section and includes a reduced diameter portion, an increased diameter portion and a chamfered area between said two portions.