Patent ID: 8016298

Claim:
A chuck for flexible manufacturing, said chuck comprising a chuck body ( 1 ) having a cylindrical lateral surface, a central drawhead ( 5 ) guided axially in a central hole of the chuck body ( 1 ) and being movable through a hole of the main spindle ( 42 ) of the machine tool supporting the chuck and further connected to inner jaws ( 4 ) radially guided in the chuck body ( 1 ) through a straight-wedge mechanism, outer jaws ( 7 ) also radially guided in the chuck body ( 1 ) and adapted to be equipped with chuck jaws for chucking a work-piece and, through their rack toothings ( 6 ), to be engaged with and disengaged from the rack toothings ( 6 ) of coupling heads ( 5 ), said coupling heads ( 5 ) being built in the inner jaws ( 4 ) and guided axially therein, wherein said coupling heads ( 5 ) comprise a double locking coupling device, the first locking stage of said coupling device includes wedge-shaped control members ( 10 ) fixed to a control ring ( 9 ), said control members ( 10 ) being engaged with surface areas formed on the inner front surface of the axially movable coupling heads ( 5 ), whereas the second locking stage includes an additional locking member directly connected to the control ring, wherein the surface areas of said additional locking member are engaged with the chuck body ( 1 ) or a centring disc ( 12 ) fixed to the chuck body ( 1 ), in one coupling position of the coupling device, whereas in the other coupling position of the coupling device, said surface areas are engaged with stationary surface areas of the machine tool supporting the chuck, characterised in that the chuck body ( 1 ) is in the form of a one-piece unit, wherein the control ring ( 9 ) is encased by the chuck body ( 1 ) and the rear centring disc ( 12 ) so that the control ring ( 9 ) can be rotated therebetween, and the locking member of the second locking stage is in the form of a cylindrical stud-shaped lock ( 11 ) guided in an axial hole ( 35 ) of the control ring ( 9 ), said lock ( 11 ) being connected in its locked state, through its front surface, to an axially guided push-rod ( 15 , 29 ), wherein said push-rod ( 15 , 29 ) is arranged either in an entirely closed hole of the chuck body ( 1 ) or in a closed hole ( 45 ) of a protective ring ( 28 ) of the main spindle ( 42 ).