Patent ID: 6478383
Filing Date: 2002-11-12
Classification: E21C

Abstract:
An assembly of a rotatable cutting tool and a tool holder, the assembly comprising:a rotatable cutting tool including an elongate tool body; the elongate tool body having an axially forward end and an axially rearward end, a longitudinal axis, an integral head portion adjacent to the axially forward end, an integral shank portion adjacent to the axially rearward end, and an integral enlarged dimension portion mediate of the head portion and the shank portion; the enlarged dimension portion of the elongate tool body having a periphery and a rearwardly facing surface defining a generally planar shoulder; the integral shank portion of the tool body carrying a washer so that the washer abuts against the rearwardly facing surface of the enlarged dimension portion of the elongate tool body; the elongate tool body having a hard insert at the axially forward end thereof; a tool holder comprising a tool holder body containing a bore having a forward end and a rearward end, and the tool holder body defining an integral mating surface surrounding the forward end of the bore, and the mating surface having a peripheral edge; the shoulder having a first transverse dimension, the mating surface having a second transverse dimension, and the washer having a third transverse dimension; the third transverse dimension of the washer being less than the second transverse dimension of the mating surface, the first transverse dimension of the shoulder being greater than or equal to the second transverse dimension of the mating surface, and the first transverse dimension of the enlarged dimension portion of the tool body being larger than the third transverse dimension of the washer; and the rotatable cutting tool being rotatably retained in the bore of the tool holder body so that the washer abuts against the mating surface of the tool holder body.