Patent ID: 7862051

Claim:
A diaphragm chuck assembly comprising: clamping jaws disposed in a chuck body and adapted to act on a workpiece to be clamped, said jaws being in a driven connection with a diaphragm located on a front face of the chuck body, and attached to an outer area of the chuck body, a centrally arranged, axially adjustable actuator engageable with said diaphragm to deform said diaphragm; counterweights assigned to said clamping jaws and located in recesses in the chuck body, each of said clamping jaws comprising a clamping head, each of said clamping heads being equipped with an offset contact piece axially arranged in a direction of the chuck body in parallel to the chuck body, the contact pieces being held in the recesses in said counterweights; and said clamping jaws being clamped against the diaphragm and said counterweights by quick-clamping devices that engage in the contact pieces and act in an axial direction of the contact pieces, wherein the contact pieces of said clamping heads are arranged in the diaphragm and in the counterweights with radial play, and said clamping heads are directly supported against a first reference surface extending axially in parallel to the chuck body in the clamping position and against a second reference surface of the diaphragm at right angles to the first reference surface.