Patent ID: 8821085

Claim:
A unitary, one piece tool holder for shrink fit mounting of a tool having a cylindrical tool shaft, the unitary, one piece tool holder comprising: a coupling shaft for coupling to a machine tool and a shrink fit chuck comprising a shrink fit chuck head and a shrink fit chuck base; a central section disposed between the coupling shaft and the shrink fit chuck base; wherein the shrink fit chuck comprises a clamping section in the shrink fit chuck head; wherein the clamping section comprises a receiver having an interior bore hole for clamping the tool shaft therein; wherein the shrink fit chuck further comprises a front diameter at the shrink fit chuck head and a rear diameter at the shrink fit chuck base; wherein a surface connecting the front and rear diameter of the shrink fit chuck comprises at least two sections; wherein a first section of the at least two sections is substantially conical and is disposed at the shrink fit chuck head and a second section of the at least two sections is substantially cylindrical and is disposed at the shrink fit chuck base, and wherein a transition from the first section to the second section is disposed between the shrink fit chuck head and the shrink fit chuck base; wherein a surface diameter of the surface of the shrink fit chuck increases at the transition from the first to the second section at a first angle with reference to a line perpendicular to a longitudinal axis of the tool holder in a range of 10° to 50°, so that the shrink fit chuck comprises the shrink fit chuck head which is more slender than the shrink fit chuck base; wherein the receiver comprises a stop for defining a position of a tool shaft within the receiver; wherein the stop is at least one of, disposed such that an end of a tool shaft in a clamped position is disposed proximate an elevation of the transition, and disposed between the transition and a front end of the shrink fit chuck head; wherein the interior bore hole has front and rear ends and defines a cylindrical inner surface having a spiral groove; and wherein the spiral groove is positioned distal from the front end of the interior bore hole by a first distance and distal from the rear end of the interior bore hole by a second distance.