Patent ID: 6997448

Claim:
A device for holding workpieces or pallets for workpieces in a releasable manner on a machining apparatus, comprising a mounting plate symmetrical about a clamping axis z which can be connected to the machining apparatus for machining the workpiece, and a clamping pin which can be connected to the pallet or to the workpiece and can be held in the mounting plate in a releasable manner, at least one spring for producing a clamping force for fastening the clamping pin to the mounting plate being provided, and a piston which can be moved hydraulically or pneumatically against the clamping force being provided, and a ball sleeve integral with the mounting plate and having balls which can be moved into the ball sleeve by the piston and are arranged so as to interact with the clamping pin in such a way that the clamping pin can be released against the clamping force, wherein a centring region which interacts with the clamping pin and is formed in one piece and in an annular-disc shape form on the mounting plate, and the balls are moveable radially between the piston and the clamping pin and held against axial movement in the ball sleeve relative to the mounting plate.