Patent ID: 7217072

Claim:
A tool system comprising: (a) a rotary tool having an axis of rotation and a retaining shank having a first diameter; (b) a tool holder having a clamping shank with an end shank region and an accommodating opening in the end shank region for accommodating the retaining shank coaxially to the axis of rotation; wherein the accommodating opening has an essentially circular cross-section with a second diameter less than the first diameter and on its circumferential surface is provided with clamping surfaces for securing the retaining shank with a press fit; wherein the end shank region has an outer circumferential casing and a plurality of tension spokes distributed in the circumferential direction, wherein the tension spokes at their radially outer ends are attached to and bridged by the annular outer circumferential casing and at their radially inner ends are provided with said clamping surfaces; (c) heating means for heating the annular outer circumferential casing to pull the tension spokes radially outwardly from a first position in which the cross-section of the accommodating opening is said second diameter to a second position in which the cross-section of the accommodating opening is a third diameter, the third diameter being larger than the first diameter.