Patent ID: 8870628

Claim:
A clamping device ( 10 , 10 ′) for clamping a workpiece, particularly spectacle lens, blocked on a block piece (B) for processing and/or coating the workpiece, comprising a receiving space ( 34 , 34 ′), which has a center axis (M), for a clamping section ( 16 ) of the block piece (B) and a plurality of clamping surfaces ( 36 , 36 ′), which are provided in an edge region of the receiving space ( 34 , 34 ′) and which can be selectably brought into engagement with the clamping section ( 16 ) of the block piece (B) in order to clamp the block piece (B), characterized in that the clamping surfaces ( 36 , 36 ′) are disposed opposite one another in pairs at a radial spacing from the center axis (M) with the clamping surfaces of each pair facing each other and being selectably movable towards one another by a clamping member ( 38 , 38 ′) in order to clamp the clamping section ( 16 ) of the block piece (B) by clamping forces (F), which are oriented substantially in a circumferential direction with respect to the center axis (M) or substantially in a tangential direction at a radial spacing from the center axis (M), or movable away from one another in order to release the clamping section ( 16 ) of the block piece (B).