Abstract: A force actuated clamping chuck has a chuck body with a central bore and at least two clamping jaws that are guided in radial jaw guides of the chuck body. The radial jaw guides have opposed sidewalls with a plurality of guide grooves which are engaged by a plurality of guide ribs provided at lateral surfaces of the clamping jaws. A clamping piston is axially guided in the central bore and has a throughbore for receiving a workpiece. The clamping piston has key grooves provided at the periphery thereof. The clamping jaws have a key member at an end thereof facing the clamping piston. The key members engage the key grooves. At least two of the guide ribs extending over the entire radial length of the clamping jaw have a trapezoidal cross-section. At least one of the guide ribs, extending over a portion of the radial length at an end of the clamping jaw remote from the clamping piston, has a trapezoidal cross-section.

Abstract: A force-actuated chuck includes a chuck body having radial jaw guides and clamping jaws guided in the radial jaw guides. At least one force-activated movable drive member is arranged in the chuck body for driving the clamping jaws. Each one of the radial jaw guides has a centrally arranged cutout for receiving a lubricant.

Abstract: A chuck having at least one jaw assembly that is radially displaceably guided in a chuck body and comprises a driving jaw and a clamping jaw. A coupling member is mounted in the driving jaw in such a way as to be displaceable at right angles to guides provided in the chuck body for the jaw assembly, with the coupling member being displaceable between an uncoupling position and a coupling position in which the coupling member is in positive engagement with a back side of the clamping jaw. An eccentric unit is rotatably mounted in the driving jaw for effecting the displacement of the coupling member, with the eccentric unit having a nonconcentric shaft that is disposed in a transverse slot of the coupling member.