Shrinking arrangement for tool holder having an induction-heating arrangement

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.