Patent ID: 7150505
Filing Date: 2006-12-19
Classification: E21C

Abstract:
1. A tool comprising a tool body having a tapered cutting end, a hardened tip at a forward end of said cutting end, an axial shank extending rearward of said forward cutting end and a radial flange joining said axial shank to said forward cutting end, a compressible sleeve around said shank, said compressible sleeve having a forward end, said forward end having at least one radially outwardly extending protrusion wherein said forward end is noncircular, a wear ring having a noncircular central opening complementary to said noncircular forward end of said compressible sleeve and including a radially extending contact surface, said central opening extending around said forward end of said sleeve, and around said shank wherein said protrusion contacts said contact surface of said central opening and prevents rotation of said wear ring relative to said sleeve.