Patent ID: 7229136
Filing Date: 2007-06-12
Classification: E02F,E21C

Abstract:
1. A rotatable tool assembly for insertion into a tool holder having a cylindrical bore, said tool assembly comprising a tool body having a tapered forward cutting end, an axial shank extending rearwardly of said forward cutting end, and a rearwardly facing annular surface joining a rearward end of said forward cutting end to a forward end of said shank, a generally cylindrical compressible sleeve around said shank, said compressible sleeve having an axis, a forward end adjacent said annular surface, and a longitudinal slot having generally parallel spaced apart slot edges, said compressible sleeve having a cut out portion at said forward end, said cut out portion defined by a longitudinal side wall circumferentially spaced from both said slot edges, said cut out portion having a first width, an annular wear ring having a central opening and a protrusion extending radially inward of said central opening, said protrusion having a second width less than said first width, said wear ring around said compressible sleeve with said protrusion aligned axially rearward of said cut out portion, said compressible sleeve compressed by said protrusion to a first diameter, said wear ring axially moveable along said compressible sleeve to a position around said forward end thereof where said protrusion will extend into said cut out portion and said compressible sleeve will expand to a second diameter larger than said first diameter.