Patent ID: 7115846

Claim:
A shrinking arrangement for a tool holder ( 3 ) which retains a rotary tool with a press fit in a central accommodation opening ( 11 ), the shrinking arrangement comprising: an induction-heating arrangement ( 15 , 18 ) for thermally expanding the tool holder ( 3 ) in the region of the accommodating opening ( 11 ), wherein: the induction-heating arrangement ( 15 , 18 ) includes an induction-coil unit 15 ) which is displaceably guided on a vertical guide column ( 25 ) with its coil axis extending vertically from an induction-current generator ( 18 ) which is fixed in relation to the guide column ( 25 ) and is connected to the induction-coil unit ( 15 ); an arresting clamping arrangement ( 29 ) for arresting the induction-coil unit ( 15 ) in a selectable vertical position on the guide column ( 25 ), wherein the arresting clamping arrangement ( 29 ) has a handle ( 27 ) intended for releasing the arresting action of the arresting clamping arrangement ( 29 ) in a single-handed operation; and a manually actuatable contact switch ( 46 ) by means of which the supply of induction current to the induction-coil unit ( 15 ) can be switched on and off in a freely selectable manner at least for a limited period of time, wherein the contact switch ( 46 ) is arranged on the induction-coil unit ( 15 ) proximate the handle ( 27 ) such that said contact switch ( 46 ) can be actuated in the single handed operation for releasing the arresting action.