Abstract: A chuck has a chuck body rotatable about an axis, a plurality of jaws radially displaceable on the body for gripping a workpiece, a chuck drive for rotating the chuck about the axis, and a center point axially shiftable in the body and axially engageable with the workpiece gripped by the jaws. An electric drive is coupled to the center point for axially shifting same.

Abstract: A chuck has a chuck body rotatable about an axis, a plurality of jaws radially displaceable on the body for gripping a workpiece, a chuck drive for rotating the chuck about the axis, and a center point axially shiftable in the body and axially engageable with the workpiece gripped by the jaws. An electric drive is coupled to the center point for axially shifting same.

Abstract: A chuck has a body rotatable about an axis and formed centered on this axis with a passage. Pivots angularly equispaced about the axis in the chuck body define respective pivot axes. An actuating sleeve axially shiftable in the passage carries a piston disk having a frustoconical outer surface centered on the chuck axis and axially shiftable in the body by the sleeve. Respective shafts journaled in the pivots and rotatable therein about the respective pivot axes each have an outer surface portion that is frustoconical and centered on the respective pivot axis. Respective levers fitted to the frustoconical surface portions of the shafts each have a front arm projecting axially forwardly from the shaft out of the chuck body and adapted to carry a tool-gripping jaw and a rear arm projecting axially rearwardly from the shaft and engageable by the outer surface of the disk.

Abstract: The invention relates to an electrical stressing means having a housing (2) which can be attached to the drive spindle of a machine tool and in which a threaded rod (3) for adjustment of the clamping jaws of a chuck is mounted such that it can be moved axially, and having an electric actuating motor (4), whose rotor is connected for drive purposes to a drive wheel (6). The drive wheel (6) is connected to the shaft generator (7) of a harmonic drive, and the internal gearwheel (8) of the harmonic drive is connected to the housing (2), with the steel bush (9) (flexspline), which has an external tooth system, of the harmonic drive being provided as a drive for the spindle nut associated with the threaded rod (3).

Abstract: The invention relates to an electrical stressing means having a housing (2) which can be attached to the drive spindle of a machine tool and in which a threaded rod (3) for adjustment of the clamping jaws of a chuck is mounted such that it can be moved axially, and having an electric actuating motor (4), whose rotor is connected for drive purposes to a drive wheel (6). The drive wheel (6) is connected to the shaft generator (7) of a harmonic drive, and the internal gearwheel (8) of the harmonic drive is connected to the housing (2), with the steel bush (9) (flexspline), which has an external tooth system, of the harmonic drive being provided as a drive for the spindle nut associated with the threaded rod (3).

Abstract: A chuck has a chuck body centered on and rotatable about a body axis, two first jaws diametrally flanking the body axis, each formed with an angled actuation face, and radially shiftable in the chuck body, and two second jaws diametrally flanking the body axis, each formed with an angled actuation face, interleaved with the first jaws, and radially shiftable in the chuck body. An inner sleeve engages the actuation faces of the first jaws and is axially shiftable to radially shift the first jaws, and an outer sleeve engages the actuation faces of the second jaws and is axially shiftable to radially shift the second jaws. An axially shiftable actuation element carries a pivotal force-transmitting rocker having inner and outer ends operatively engaging the respective inner and outer sleeves for axially shifting the inner and outer sleeves on axial shifting of the element while permitting limited axial movement of the inner and outer sleeves relative to each other.

Abstract: The invention relates to a clamping chuck comprising several base jaws (3) which are radially guided in a chuck body (2) and on which a top clamping jaw (5) is detachably fixed. At least one connecting part (6) which is radially open on one side and is provided with a first contact surface (9) that is inclined relative to the axis of the chuck is configured on the top clamping jaw (5). At least one coupling part (8) which is provided with a second contact surface (9) that is inclined in a manner corresponding to the first contact surface (7) is disposed on the base jaw (3) so as to cooperate with the connecting part (6).

Abstract: A chuck has a chuck body rotatable about a chuck axis, a plurality of holders angularly spaced about and radially displaceable on the body and each formed with an outwardly flared seat centered on a respective seat axis, and an actuator for radially displacing the holders on the body. Respective jaws on the holders each have an inwardly tapered stem complementary to and engaged snugly in the respective seat. Respective locking elements in the holders are each displaceable into a locking position securing the respective stem in the respective seat.

Abstract: A chuck has a chuck body rotatable about a main axis and a plate displaceable axially on the body between an outer position and an inner position. Springs urge the plate into the outer position. A locking element on the body can move between a blocking position preventing displacement of the plate from the outer position into the inner position and a freeing position permitting such displacement. A plurality of jaw holders angularly spaced about the axis are fixed axially on the plate and each have radially displaceable outer and inner ends. A piston axially displaceable in the body has cam formations engaging the jaw-holder inner ends for radially displacing the jaw-holder outer ends on axial displacement of the piston.

Abstract: A chuck has a chuck body rotatable about a chuck axis, a plurality of holders angularly spaced about and radially displaceable on the body and each formed with an outwardly flared seat centered on a respective seat axis, and an actuator for radially displacing the holders on the body. Respective jaws on the holders each have an inwardly tapered stem complementary to and engaged snugly in the respective seat. Respective locking elements in the holders are each displaceable into a locking position securing the respective stem in the respective seat.

Abstract: A chuck has a chuck body rotatable about a main axis and a plate displaceable axially on the body between an outer position and an inner position. Springs urge the plate into the outer position. A locking element on the body can move between a blocking position preventing displacement of the plate from the outer position into the inner position and a freeing position permitting such displacement. A plurality of jaw holders angularly spaced about the axis are fixed axially on the plate and each have radially displaceable outer and inner ends. A piston axially displaceable in the body has cam formations engaging the jaw-holder inner ends for radially displacing the jaw-holder outer ends on axial displacement of the piston.

Abstract: A chuck has a chuck body adapted to be rotated about a chuck axis and formed with a plurality of axially forwardly open passages each having a pair of angularly confronting side faces, respective guides pivotal in the passages about respective guide axes extending secantally of the chuck axis, and respective elongated jaw arms axially slidable in the guides. Each jaw arm has a pair of oppositely angularly directed side faces angularly confronting and spaced from the respective passage side faces. Two guide plate in each of the passages each have an outer face engaging one of the respective passage side faces and an inner face engaging the respective arm side face. These plates are releasably fixed in the chuck body.

Abstract: A chuck has a chuck body adapted to be rotated about a chuck axis and a plurality of elongated jaw arms angularly spaced about the axis, pivotal in the chuck body about respective guide axes extending secantally of the chuck axis, and axially slidable in the body. Each jaw arm has a front outer end formed with a generally axially extending and radially inwardly directed outer face and an axially outwardly and forwardly directed inner face extending radially inward from an axially inner end of the outer face. Each outer face converges axially outward with the chuck axis and forms a small acute angle with the chuck axis. Respective jaw inserts each have a pair of faces complementary to and flatly engaging the respective jaw faces. These inserts are releasably secured to the jaw outer ends with the insert faces bearing on the jaw faces. The faces are planar. In addition each insert is formed with at least one throughgoing hole extending substantially parallel to the outer insert face.

Abstract: A lathe chuck has a chuck body rotatable about an axis and having a plurality of angularly equispaced and axially forwardly open angled guides, a set of first jaws in some of the guides, and a set of second jaws in the other guides alternating with the first jaws. Respective first and second actuating plates coupled to the respective sets of jaws are axially displaceable to radially displace the jaws in the guides. An actuating shaft axially is displaceable in the body. A rocker connects the shaft with the plates for limited relative axial movement of the plates so that the first jaws can engage the workpiece before the second jaws. The actuating shaft has a tubular front end, a core shaft is axially connected to one of the plates and coaxially received in the actuating-shaft end, and a tube shaft is axially connected to the other of the plates and coaxially surrounds the actuating-shaft end. This actuating-shaft end in turn has a radially throughgoing hole through which the rocker extends.

Abstract: A pivot-chuck actuator has a housing extending along an axis, a piston chamber centered on the axis, and a vane chamber offset and separate from the piston chamber. A piston is axially displaceable in the piston chamber and axially fixed to a shaft extending from the housing on the axis. A vane element on the shaft angularly subdivides the vane chamber into a pair of angularly offset compartments and formations rotationally couple the vane element to the shaft for joint rotation therewith while permitting relatively axial movement of the vane element and shaft. The compartments can be alternately pressurized to rotate the vane element and shaft about the axis. A pair of counterweights angularly fixed on the shaft axially flank the vane element to allow the actuator to operate at very high speeds.

Abstract: An integrated power chuck assembly for a lathe has a hollow lathe spindle of a diameter sufficient to accommodate at least the actuating cylinder and a multiple medium feed device and preferably at least part of the stroke-control device which can include at least one sensor for the position of the piston.

Abstract: A pivot-chuck actuator has a housing extending along an axis and formed centered on the axis with a piston chamber and a vane chamber offset and separate from the piston chamber. A piston axially displaceable in the piston chamber is axially fixed to a shaft extending from the housing on the axis. A vane element on the shaft angularly subdivides the vane chamber into a pair of angularly offset compartments and formations rotationally couple the vane element to the shaft for joint rotation therewith while permitting relatively axial movement of the vane element and shaft. The compartments cam be alternately pressurized to rotate the vane element and shaft about the axis. A pair of counterweights angularly fixed on the shaft axially flank the vane element. Formations rotationally couple the counterweights to the shaft for joint rotation therewith while permitting relative axial movement of the counterweights and shaft.

Abstract: A chuck has a chuck body adapted to be rotated about a chuck axis and a plurality of elongated jaw arms angularly spaced about the axis, pivotal in the chuck body about respective guide axes extending secantally of the chuck axis, and axially slidable in the body. Each jaw arm has a front outer end formed with a generally axially extending and radially inwardly directed outer face and an axially outwardly and forwardly directed inner face extending radially inward from an axially inner end of the outer face. Each outer face converges axially outward with the chuck axis and forms a small acute angle with the chuck axis. Respective jaw inserts each have a pair of faces complementary to and flatly engaging the respective jaw faces. These inserts are releasably secured to the jaw outer ends with the insert faces bearing on the jaw faces. The faces are planar. In addition each insert is formed with at least one throughgoing hole extending substantially parallel to the outer insert face.

Abstract: A chuck has a chuck body adapted to be rotated about a chuck axis and formed with a plurality of axially forwardly open passages each having a pair of angularly confronting side faces, respective guides pivotal in the passages about respective guide axes extending secantally of the chuck axis, and respective elongated jaw arms axially slidable in the guides. Each jaw arm has a pair of oppositely angularly directed side faces angularly confronting and spaced from the respective passage side faces. Two guide plate in each of the passages each have an outer face engaging one of the respective passage side faces and an inner face engaging the respective arm side face. These plates are releasably fixed in the chuck body.