Patent ID: 6994404
Filing Date: 2006-02-07
Classification: E21C

Abstract:
1. An assembly for retaining a tool in a tool holder comprising a tool holder having a transverse cylindrical hole with a longitudinal axis and an inner diameter, said tool holder having a planar forward surface perpendicular to said axis, means for retaining said tool holder to a machine, a tool having a tapered forward cutting end, a radial flange axially aligned behind said forward cutting end, a cylindrical shank axially aligned behind said radial flange, and said cylindrical shank having an outer diameter less than said inner diameter of said transverse hole, a retainer sleeve around said cylindrical shank for retaining said shank in said cylindrical hole, said retainer sleeve fitted around a portion of said shank, a washer having an inner diameter, a forward surface and a rearward surface, said washer fitted around said shank, said shank and said retainer sleeve fitted into said transverse hole, and an O-ring having a surface, said O-ring fitted around said shank, a first portion of said surface of said O-ring abutting against a stationary surface on one of said tool holder and said retainer sleeve and a second portion of said surface of said O-ring abutting a surface of said washer wherein said washer is retained against rotation with said tool.