Patent ID: 6863352
Filing Date: 2005-03-08
Classification: E21C

Abstract:
1. A tool assembly for insertion into a tool holder having a transverse mounting hole having an inner diameter, and a planar forward surface, said tool assembly comprising in combination a tool having a tapered forward cutting end, a radial flange aligned axially behind said forward cutting end, a cylindrical shank aligned axially 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, a washer having an inner surface, a forward surface and a rearward surface, said inner surface having a diameter greater than that of said shank, an O-ring having an inner surface and an outer surface, said outer surface having a diameter larger than said inner diameter of said washer, said retainer sleeve fitted around a circumference of said shank, said washer fitted around said shank and said retainer sleeve, and said inner surface of said O-ring fitted around said retainer sleeve and rearward of said washer to thereby retain said washer on said shank.