Diaphragm chuck

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 (22) of said clamping jaws (3) and the clamping heads (21) are each equipped with an intermediate element (101;
• 111;
• 121;
• 131) in an area between said jaws (3) and the heads (21) on one hand and the quick-clamping devices (31, 71) on the other hand, by means of which intermediate element (101;
• 111;
• 121;
• 131) flexural moments and rotational torques of the quick-clamping devices (31, 71) are eliminated and exclusively axially vectored tensile forces are transmitted onto the selected one of said clamping jaws (3) and the clamping heads (21).