Patent ID: 6991411

Claim:
A device for clamping and releasing a work tool ( 16 ) in a work tool receptacle, the work tool having a work tool shaft ( 14 ), the device including: the work tool receptacle ( 10 ) including a socket part ( 12 ) open on its free end ( 24 ) and comprising electrically conductive material adapted for frictionally engaging reception of the tool shaft ( 14 ), and an induction coil ( 26 ) in the form of a ring or cylindrical coil having a first end adjacent the free end of the socket part, a second end opposite the free end of the socket part, and an outer surface, said induction coil encircling the socket part ( 12 ) of the tool receptacle ( 10 ) and adapted for heating the socket part ( 12 ) when energized with high frequency alternating current, wherein the first end of the induction coil ( 26 ) adjacent the free end of the socket part ( 12 ) is closed off by a pole shoe ( 34 ) exhibiting a central through-hole ( 36 ) for the tool ( 16 ) and comprised of a magnetically conductive and electrically non-conductive material, and wherein the pole shoe ( 34 ) partially overlaps the free end ( 24 ) of the socket part ( 12 ).