Patent ID: 7527459

Claim:
A tool holder assembly suited to be removably received into a tapered opening in the spindle of a machine tool, comprising: a cutting tool having cutting means on one end and a shank on the opposite end, said shank including a triangular drive section, the drive section includes three interconnected walls that are each parallel to a longitudinal axis of the shank, a cylindrical shaft extends axially from the drive section, the shaft includes a threaded axial bore; a tool holder body having an external tapered wall formed about an axial opening and receivable in an opening of a rotatable drive spindle, the axial opening passing through the tool holder body and has a first end with internal threaded means for receiving a retention knob and a second end that is shaped complementary to the shank said axial opening narrows between the first end and second end to form an annular seat; and fastening means contained within the axial opening connected to the threaded bore in the cutting tool to axially move the cutting tool toward the tool holder body and telescopically receive the shank within the second end of the tool holder body; wherein the axial opening has an annular channel formed between the annular seat and the first end and includes retention means that is removably seated within the channel and retains the fastening means within the cutting tool body.