Patent ID: 7980565
Filing Date: 2011-07-19
Classification: B23B,Y10T

Abstract:
1. A diaphragm chuck ( 1 ) comprising clamping jaws ( 3 ) connected to a chuck body ( 2 ) and adapted to act on a workpiece ( 10 ) to be clamped, said jaws being in a driven connection with a diaphragm ( 4 ) that is located on a front face ( 11 ) of the chuck body ( 2 ), and being attached to an outer area of the chuck body ( 2 ) and deformable by means of a centrally arranged, axially adjustable actuator ( 5 ), the chuck further comprising counterweights ( 8 ) assigned to said clamping jaws ( 3 ) and located in recesses ( 7 ) in the chuck body ( 2 ), each of said clamping jaws ( 3 ) being designed as clamping heads ( 21 ) each equipped with an offset contact piece ( 22 ) axially arranged in the direction of the chuck body ( 2 ) and extending generally axially in parallel to the chuck body ( 2 ), the contact pieces ( 22 ) being held in recesses ( 20 ) in said counterweights ( 8 ) and said clamping jaws ( 3 ) being clamped against the diaphragm ( 4 ) and said counterweights ( 8 ) by means of quick-clamping devices ( 31 , 71 ) that engage in the contact pieces ( 22 ) and act in an axial direction of the contact pieces ( 22 ), at least one of said clamping jaws ( 3 ) and the clamping heads ( 21 ) being directly supported against a first reference surface ( 23 ) running axially in parallel to the chuck body ( 2 ) in the clamping position, and against a second reference surface ( 24 ) of the diaphragm ( 4 ) at right angles to the first reference surface ( 23 ), wherein the contact pieces (