A clamping device for releasably holding a tool holder shank formed with a bore includes a housing having a forwardly facing surface and a bore. A drawbar is mounted reciprocally movable inside the bore and in a forward end has engagement device, which is arranged to engage with an engagement formation inside the bore of the tool holder shank. The drawbar is, in a rear portion, formed with a drawbar aperture, and a cam shaft extending through the drawbar aperture and being rotatably journalled in the housing and arranged to impart an axial displacement to the drawbar in relation to the housing. The cam shaft includes first and second spaced apart cam formations and an intermediate circular cylindrical portion located between the cam formations, wherein the first and second cam formations are journalled in a first and second seating apertures, respectively, in the housing on opposite sides of the drawbar.

A clamping fixture for clamping a component, in particular a workpiece or tool, having a number of clamping jaws, distributed along a periphery, which are connected by appropriate elastic flexural webs to a main body, wherein the clamping jaws are adjustable by an axially movable actuating device in a radial direction from a release position into a holding position, which clamping fixture is characterized in that the flexural webs, in their release position, are inclined in relation to an axially parallel direction radially in a direction of their respective holding positions.

Disclosed is a clamping device (1) for clamping a toolholder of a drilling, milling or grinding tool in a balancing machine, comprising a receiver unit (2) having a receiving opening (9) for the coupling shaft of the toolholder and a collet (10), in which the shaft (20) of an actuator (18) for actuation of the collet (10) is slidably guided in a centrally located bore (19) of the receiver unit (2). The shaft (20) has at its one end a load-applying body (22) upon which a plurality of compression springs (30, 31) take support to enable the collet (10) to be tightened. The compression springs (30, 31) are arranged and/or configured in such a way that the spring loads acting on the load-applying body (22) with the collet (10) tightened act on the load-applying body (22) asymmetrically relative to the axis of the shaft (20).