Abstract: A self-centering support for clamping and/or securing a workpiece on a turning lathe has a housing and three securing members connected in the housing and adjustable in a common plane for securing the workpiece. A first and a second one of the securing members are positioned laterally within the housing and are arranged mirror-symmetrically to one another. Each first and second securing members comprises a pivot bolt for pivotably connected them to the housing. A third securing member is positioned between the first and second securing members and is slidably guided within the housing so as to be radially displaceable relative to the workpiece. The third securing member has a center piece with control surfaces. The first and second securing members each have an end for operating with the control surfaces of the center piece.

Abstract: A device for transferring a pressure medium has a first stationary component and a second component that is inserted into the first stationary component such that it is rotatably drivable therein. A first annular chamber is defined between the first stationary component and the second component and has a first and a second axial end. The first axial end is delimited at least partially by the first stationary component and the second axial end is delimited at least partially by the second component. An inlet line and an outlet line are connected to the first annular chamber. The outlet line guides the pressure medium to a consuming device. Radially extending sealing slots are defined between the first stationary component and the second component at the first and the second axial ends whereby the sealing slots have adjustable slot widths.

Abstract: A holding device on a turning machine for a workpiece, which is held by a chuck serving as a clamping device and being arranged at a receiving disk, is equipped with separate correcting elements disposed at the clamping device. The correcting elements may be controlled individually by electrical, pneumatic or hydraulic means. The correcting elements act on the clamping device in order to adjust the workpiece.It is thereby possible to adjust the clamping device itself in a defined manner, so that the clamped workpiece may be adjusted easily.

Abstract: A chuck with radially adjustable base jaws and exchangeable clamping jaws is provided. The toothings of the base jaws intermesh with respective toothings of the clamping jaws. The base jaws and the clamping jaws are coupled by respective keys which are adjustable relative to one another by an amount corresponding at least to the height of the intermeshing toothings. The adjustment is carried out by a clamp bolt which extends through the shaft of the key and which is provided with a conical clamping surface. The clamp bolt is supported at a rotatably mounted threaded elements or spindle such that the key may be adjusted in the axial direction of the key shaft by the rotation of the threaded element or spindle due to the cooperation of respective counter surfaces provided at the threaded element or spindle with the clamping surfaces of the clamp bolt. Due to this arrangement it is possible to connect and release respective clamping jaws from the base jaws in a very short period of time.

Abstract: A chucking device is provided that has displaceable base jaws that can be coupled with attachment jaws via respective one-piece securing bars that are axially supported and radially displaceably guided in a guide slot of the attachment jaw and an inclined guide slot of the base jaw. To effect radial shifting of the securing bars, an adjustment pin is disposed in the base jaw parallel to the guide slot thereof and is in operative connection with the securing bar via an undercut.

Abstract: An apparatus for actuating clamping jaws of a chuck via an adjustment member that, to produce a rotational adjustment movement, is drivingly connected with an actuator formed from a reversible drive motor and a subsequent gear mechanism that is drivingly connected to the output side of the motor via a torque coupling. The gear mechanism is embodied as a two-stage synchronized gear in the form of a transmission gear drive having central gears that are rotatably mounted within one another and are drivingly connected via a step-type gearing to a drive member of the chuck and to the adjustment member. The central gears are drivingly and synchronously coupled via two transmission gears fixedly disposed on a transmission shaft that is rotatable about the central gears and engages the torque coupling in a load-dependent manner. The reduction stages of the transmission gear drive correspond to transmission stages of the step-type gearing.

Abstract: An apparatus for operating the clamping jaws of a chuck. The clamping jaws are coupled with an adjustment member which, for producing an adjustment movement is in driving connection with an adjusting drive mechanism. The latter is formed by a two-part rotary motor that is disposed externally of the main spindle and is concentric thereto. The rotary motor is rotatably mounted as a self-contained unit. One functional member of the rotary motor is driveable directly by the main spindle and is drivingly supported thereon. The other functional member is drivingly connected with the adjustment member. To maintain the clamping force, the two functional members can be positively secured to one another. To undertake an adjustment movement, the two functional members can be infinitely variably moved relative to one another.

Abstract: In a self-centering steady rest (1) with three holding members (12,13,14) acting upon a workpiece (2) to be chucked, an adjusting member (15) interacting with the two outer holding members (13,14) is adjustable in the longitudinal direction (A) of the central holding member (12) by an adjustable distance corresponding to the sum of respective deformations of the outer holding members. This makes it possible to compensate not only the elastic deformations of the two outer holding members (13,14), but all back rest components involved in the transmission of forces. Consequently, reproducible centered chucking of the workpiece (2) can be accomplished at all times with great chucking accuracy.

Abstract: In a device for the coupling of attachment chucking jaws (31) to basic jaws (11) which are movably guided in a chuck body (2) of a chuck (1), the basic jaws each have an extension (21), projecting in an axial direction, with a collar (23) projecting inwardly and/or outwardly on each extension. A recess (32) is machined into the attachment chucking jaws (31) which recess is provided with an undercut (33) and with a countersurface interacting with a stop surface of the extension (21). A locking member (41) is inserted into each basic jaw for arresting the attachment chucking jaws (31), which locking member is movable axially and introducible into the attachment chucking jaws. The actuation of the locking members is provided by an axially movable control element (42) which is automatically connected mechanically to the locking members (41) via an intermediate member (43) and/or via a deflection member (44). Due to this design the locking action is readily accomplished and monitored.

Abstract: A lubricant dispenser for a viscous lubricant such as grease, for a chuck body of a power chuck, comprises a container for containing a supply of the viscous lubricant. A delivery plunger, which is in the container and acts on the lubricant, is continually subjected to the pressure of a pressure medium. This forces lubricant from the container into a flexible line which is connected to a pressure intensifier mounted on the chuck body. The pressure intensifier contains a pressure piston which is movable under the influence of an intermittently operating pressure medium, and which carries a displacement piston which can be engaged against a receiving insert of the chuck body to open a valve and close the discharge of lubricant from the pressure intensifier into the chuck body.

Abstract: A chuck for machine tools has basic jaws which engage with attachment jaws which are exchangeably retained and can be fed by means of a pallet and attached through a relative rotation mechanism between the jaws, each basic jaw is provided on its face with a specially shaped projection and each attachment jaw is provided with a corresponding, laterally open recess. The radially oriented surfaces of these parts are concentric to the longitudinal axis of the chuck body and furthermore, the attachment jaws are locked to the basic jaws secure against rotation by a holding member in a chucking position. This makes it possible to exchange the attachment jaws easily and quickly with the aid of machine motions and, in addition, there is an assurance of safe support of the attachment jaws on the basic jaws.

Abstract: A face driver for centering and driving a workpiece to be chucked in a lathe comprises a support provided with a dead center member and several driving pins around the dead center member so as to be movable and pressable against the workpiece by a compression member acting against a pressure plate, the pressure plate is retained so as to be floating in the axial directions of the support, and it has parts or arms associated with the driving pins which are elastically deformable. This causes squareness errors of the workpiece to be chucked to be compensated for automatically at low structural cost.

Abstract: In an arrangement for coupling a false jaw to a master jaw of a chuck, wherein a positive locking is effected by a radial displacement, the master jaw is provided with an extension having a stop surface and a projection. The false jaw has a recess for receiving the extension and a relief shoulder and is guided in the direction of rotation. Due to this arrangement, the false jaw is well supported and highly stable, so that strong forces can be transmitted, and a high repetitive accuracy in chucking is obtained.

Abstract: To check the flat or planar clamping of a workpiece in the jaws of a chuck, and/or to measure the respective clamping jaws, a pressure responsive signal transmitter is provided in at least one of the contact surfaces of a clamping jaw 6 or in an elastically deformable zone, which can be electrically coupled to measuring instruments provided outside the chuck body, in order to evaluate the signals. This makes it possible to find out, before starting the operation of a machine tool, whether the workpiece is correctly clamped, and with what clamping force.

Abstract: In a pallet (31) for the seating of interchangeable clamping jaws (21) lockable to base jaws (4) of a chuck (1) the clamping jaws are inserted, for their retention in radially oriented, open-faced recesses (32) of the pallet (13). In the pallet, on both sides of each recess (32) one or more clamping bolts (33) are provided, each of which is arranged so as to be movable within limits and to which a pressure can be applied. By means of the bolts, the interchangeable clamping jaws (21) can be locked in a defined position in the pallet (31) and unlocked for their removal. This makes it possible to insert the interchangeable clamping jaws (21) without problems into the recesses (32) of the pallet (31) and also to remove them from the pallet without having to guide the interchangeable clamping jaws (21) laterally and without their jamming between guide surfaces. Rather, centering and fixing of the interchangeable clamping jaws (21) takes place automatically, when they are in a predetermined end position.

Abstract: To check the operating conditions of a power chuck, compressed air is supplied to the contact surfaces of the clamping jaws and/or of the workpiece to be clamped. Air passages are provided in the chuck body which open into the contact surfaces. The escaping air makes it possible to find out whether the contact is planar, and thus whether the clamping is exact.

Abstract: In a power chuck including jaws moved by drivers which are displaceable in the axial direction of the chuck body by means of an axially displaceable actuating member mounted in the chuck body, the actuating member is coupled to the individual drivers through two gimbal rings which compensate for unequal displacement of the jaws. The gimbal suspension can be bridged by connecting the rings rigidly to each other. A balanced as well as centric clamping of a workpiece may thus be effected. The manufacturing costs are low so that both economy and high reliability in operation are obtained.

Abstract: A power operated chuck comprises a rotatable chuck body having a plurality of clamping jaws which are radially movably mounted on the chuck body. An axially movable piston on the chuck body is moved by a moving mechanism which includes several hooks or hook members having wedge-shaped interengaging surfaces for effecting relative movement therebetween. The chuck body has a plurality of recesses with counterweights which are slidably movable or pivotally movable in the recesses. The cover covers the recess adjacent an end of the chuck body. A pressure member alongside each of the counterweights is laterally offset relative to the center of gravity of the associated counterweights and is mounted in the chuck body for rotary movement in a manner such that the centrifugal forces produced by rotation of the counterweights at the chuck body are applied against the exterior of the piston adjacent the wedge-shaped portion of the hooks.

Abstract: In a power operated chuck, a radially elastically deformable seal ring is inserted in a recess of a pressure fluid supply ring embracing the chuck body. The seal ring comprises a stiff body portion in which passages are provided for the pressure fluid, and laterally projecting fins which are elastically deformable in the radial direction of the chuck and apply against the supply ring. In an unloaded state, the seal ring is under slight bias applied against the supply ring and spaced from the circumferential surface of the chuck body. The area of the outer circumferential surface of the seal ring, exposed to the inflowing pressure fluid, is larger than the ring area on the inside circumference which is exposed to fluid pressure from the inside. The design makes it possible to transfer, in a short period of time, a large amount of pressure fluid into the chuck. Also, the seal ring disengages from the chuck body abruptly.

Abstract: In a chuck (1) for lathes (4), which is provided with a compensating jaw set (61) for adaptation to unequal workpieces (2) and with a centering jaw set (21) engaging at axial spacing therefrom, the centering jaws (22) are guided normal to the longitudinal axis (A) of the chuck for adjustment in centering jaw heads (16) axially displaceable to a limited extent, which centering jaw heads can be coupled through axis-parallel connecting elements (19) with a common positioning member (18). Also, the connecting elements (19) are provided with wedge surfaces (32,33), by means of which the axial adjustment movement of the adjusting member (18) is deflectable into a radial feed movement.