Abstract: A lathe which rotates a workpiece on centers about an axis, with one end face of the workpiece directed axially backward and having a radially outer periphery generally centered on the axis, has a drive formed by a body axially adjacent the workpiece end face and rotatable about the axis, a motor for rotating the body about the axis, and a face plate rotationally fixed on the body and lying between same and the workpiece end face. A plurality of sets of drive formations or teeth are fixed on the face plate and directed axially forward toward the workpiece. Each set is comprised of a respective plurality of the formations angularly equispaced about the axis and radially equispaced therefrom by a respective radius different from the radius between the formations of any of the other sets and the axis.

Abstract: A hammer-drill chuck comprises a generally tubular chuck body centered on a chuck axis and having a central axially extending bit-receiving passage and a radially outwardly open chuck-key centering hole. A plurality of jaws radially but not angularly displaceable in the chuck body have inner ends engageable with the drill-bit shank in the passage. An adjustment ring connected to the jaws moves same radially synchronously and thereby centers the bit in the body by engagement of the inner ends with the shank. This ring is formed with axially backwardly directed teeth positioned axially forward of the centering hole such that when a chuck key is fitted into the centering hole its crown gear meshes with the ring teeth. A locking sleeve angularly nondisplaceable on the body carries at least one tooth axially engageable between the ring teeth.

Abstract: A drill chuck has a body carrying jaws displaceable between inner and outer positions and an adjustment ring operatively connected to the jaws for movement from outer to inner positions on rotation of the adjustment ring in a tightening direction. This adjustment ring has teeth engageable by an antiloosening detent and is urged by a spring into the teeth. The antiloosening detent is angled relative to the adjustment ring such that when engaging the teeth it blocks rotation of the adjustment ring opposite to the tightening direction and permits rotation of the adjustment ring in the tightening direction. An antitightening detent engageable with the teeth of the adjustment ring is urged by a spring outward into the teeth and is angled relative to the adjustment ring such that when engaging the teeth it blocks rotation of the adjustment ring in the tightening direction and permitting rotation of the adjustment ring opposite to the tightening direction.

Abstract: A power chuck assembly has a lathe spindle extending along and rotatable about an axis and having axially opposite front and rear ends. An axially displaceable actuator rod extends at the axis through the spindle and has front and rear rod ends at the respective spindle ends. This rod is rotatable about the axis between two angularly offset end positions. A coupling head secured to the front spindle end has a plurality of bolts displaceable radially between inner and outer positions. A chuck provided with an axially rearwardly projecting annular flange engageable over the head is formed with at least one radially but not axially open recess in which the bolts are engageable in the outer positions thereof. Actuators are connected to the bolts for displacing them from the inner to the outer positions so that, when the chuck is fitted over the coupling head, the bolts engage in the recess and axially lock the chuck on the coupling head.

Abstract: A chuck has a chuck body rotatable about an axis, a plurality of jaws radially displaceable on the body and each having a radially inwardly directed workpiece-engaging face, and an axially displaceable operator linked to the jaws to radially displace same relative to the chuck body. Respective transducers on the chuck body are connected to the jaws for generating a signal proportional to a parameter of the respective jaw. These signals are transmitted from the chuck body to a stationary signal receiver adjacent the chuck body wholly without physical contact with the signal transmitter. Similarly, a stationary energy transmitter adjacent the chuck body transmits energy and a receiver on the chuck body receives the transmitted energy wholly without physical contact with the energy transmitter and powers the signal transmitter therewith. The transducers can be position or force transducers, for instance constituted by strain gauges or linear potentiometers.

Abstract: A chuck actuator has a cylinder extending along a main axis and a piston axially displaceable in the cylinder, forming therein two compartments, and having an axially backwardly extending stem also centered on the axis and formed with two respective intake passages each having one end opening into the respective compartment and another end opening at a respective location on the stem. A connector rotatable about the axis on the stem is provided with respective fittings communicating with the locations. First and second axially spaced bearings prevent the connector from moving axially on the stem. Fluid is fed under pressure alternately to the fittings to pressurize and depressurize the respective compartments and thereby axially displace the piston in the cylinder. Normally the cylinder is connected to a chuck body and the piston to a chuck-actuating member for fluid actuation of the member.

Abstract: A drill chuck normally has a chuck body rotatable about a chuck axis and provided at its front side with a plurality of axially forwardly projecting and radially displaceable jaws. A tightening ring rotatable on the body about the axis thereof is connected via appropriate screwthread formations to the jaws so that when this ring is rotated on the chuck body about the axis in a tightening direction the jaws are displaced radially toward each other and when rotated in an opposite loosening direction the jaws are displaced apart. In addition the chuck body is formed with a radially outwardly open groove having a rear surface and with a radially outwardly open recess spaced axially forwardly of the groove and having an inner surface extending generally perpendicularly of the chuck axis and having a front portion spaced axially from and confronting the rear surface.

Abstract: A drill chuck has a chuck body rotatable about a chuck axis and formed with a radially open threaded bore and with a radially open unthreaded bore. A plurality of jaws are radially displaceable on the chuck body. A tightening ring is rotatable on the body about the axis thereof and is connected via screwthread formations with the jaws to displace same radially inwardly when the ring is rotated in a tightening direction and to displace them radially outwardly when rotated in an opposite loosening direction. A screw threaded in the threaded bore is screwable therein in one direction for radial inward displacement and in the opposite direction for radial outward displacement into engagement with the ring. Thus the screw can be screwed out to engage the ring and block its rotation. This screw is formed with a radially outwardly open recess into which the end of the handle of a chuck key can fit.

Abstract: A chuck has a chuck body adapted to be rotated about an axis and formed centered on the axis with a forwardly open tool-receiving seat. A holding element is displaceable axially in the body between a rear holding position securing a tool in the seat and a front releasing position permitting the tool to be inserted backwardly into and withdrawn forwardly from the seat, with a holding spring urging the element backwardly into the holding position. A piston axially coupled to the holding element has an axially backwardly directed piston face exposed in a chamber formed between this axially backwardly directed face and the forwardly directed face of an actuating member that is urged axially forwardly by a locking spring. A plurality of locking balls are displaceable radially but not axially in the chuck between radially inner locking positions engaged in a groove in the piston and radially outer positions engaged in a groove in the actuating member.

Abstract: A chuck key as a tubular body extending along an axis and having an axially forwardly directed end formed with an array of teeth centered on the axis. A crosspiece extends diametrically through the body at the end opposite its toothed end. A pin is displaceable axially in the bore of the body between a front position projecting axially forwardly from the body beyond the teeth and in a rear position withdrawn axially backwardly in the body. A spring braced between the pin and the body urges the pin into the front position. An operating member is movable radially relative to the body and has an outer end that projects radially from the body. Interengaging formations on this member and on the pin displace the pin against the force of the spring from the rear to front position on depression of the end of the member radially inwardly. Thus the thumb of the hand grasping the crosspiece can push in the operating member to extend the pin for fitting of the key to a chuck.

Abstract: A chuck has a chuck body rotatable about a chuck axis and subdivided along a plane perpendicular to this chuck axis into a front chuck part and a rear chuck part integrally connected together. The rear chuck part is formed with a plurality of angularly spaced and radially extending rear T-section guide grooves opening axially forwardly at the plane and each having a pair of radially extending sides each in turn formed with a step extending parallel to and backwardly offset from the plane. The front chuck part is formed in axial alignment with the rear guide grooves with respectively angularly spaced and radially extending guide grooves opening axially forwardly. The front chuck has a backwardly facing planar face lying on the plane and forwardly closing the rear guide groove. Respective webs form the bases of the backwardly closed front guide grooves, and are formed with radially throughgoing apertures substantially smaller than the respective front guide grooves.

Abstract: An actuator for a power chuck has a hollow actuator housing having a rearwardly extending housing tube that is centered on an axis and that has a closed rear end. This tube is formed with a pair of axially spaced and radially inwardly open grooves both having axial lengths equal at least to a predetermined axial distance, and the tube is further formed at these grooves with respective radially throughgoing apertures. A piston subdivides the interior of the housing into a pair of compartments and has a stem extending axially rearwardly in the tube. This piston is axially displaceable in the housing through an axial stroke at most as long as the distance corresponding to the axial lengths of the grooves. The piston is formed with a pair of throughgoing passages each having one end opening at the stem into a respective one of the grooves and another end opening into a respective one of the compartments.

Abstract: A power-chuck actuator has an actuator body forming an axially throughgoing passage and formed centered on this axis with an annular piston displaceable axially forwardly and backwardly and having a collar projecting from the front of the actuator. This collar can be connected to the actuating element of a power chuck whose chuck body can be bolted to the front end of the actuator body. In addition the actuator body has a backwardly extending sleeve on which is carried a connector body that is normally held against rotation and that is provided with hydraulic connections for pressurizing the compartments axially flanking the piston to operate the actuator. The actuator body is provided with a fan aligned with axially throughgoing passages of the connector body so that as the two bodies rotate relative to each other air is sucked through these passages by the fan to cool the actuator.

Abstract: A chuck has a chuck body formed centered on the chuck axis with an annular array of outwardly directed teeth. A plurality of generally angularly equispaced and radially displaceable jaws on the body can be displaced toward and away from each other by means of a tightening sleeve which is rotatable on the chuck body about the chuck axis. A ratchet pawl is pivoted on this sleeve and has an end engageable with the teeth in a direction so as only to allow rotation of the sleeve and chuck relative to each other in a direction moving the jaws toward each other. A spring is braced between this pawl and the sleeve and urges the sleeve into radial engagement with the teeth. A release ring can be rotated relative to the chuck body between a holding position which allows the spring to press the end of the pawl against the teeth and a releasing position which holds the end of the pawl out of engagement with these teeth.

Abstract: A lathe chuck has a chuck body rotatable about a chuck axis and carrying a plurality of angularly spaced and radially displaceable jaws each formed with an axially backwardly open jaw recess having at least one side inclined to the axis. Respective jaw actuators are axially displaceable in the chuck body and have inclined end portions engageable in the recesses for inward radial displacement of the jaws on displacement of the actuators axially forward toward axially advanced positions and for outward radial displacement of the jaws on displacement of the actuators axially backward toward partially retracted positions. In addition each actuator is displaceable axially backwardly into a fully retracted position when it is out of engagement with the respective jaw, but the actuators engage the respective jaws when in and between the advanced and partially retracted positions. Respective weights are radially slidable on the chuck between inner and outer positions and through intermediate positions.

Abstract: A chuck has a chuck body rotatable about a chuck axis and provided with a plurality of jaws which can be radially displaced toward one another by rotation of a tightening sleeve on the chuck body in a tightening direction and which can be displaced radially apart by rotation of the tightening sleeve in an opposite loosening direction. A latching pin is displaceable chordally in a blind bore of the chuck body and is urged radially outwardly. This latching pin is engageable between the teeth of an array of radially inwardly directed teeth formed on the tightening sleeve. The spring of the locking pin presses this pin chordally forwardly into engagement with the teeth with the edge defined between the side and end surfaces of the pin fitting between two adjacent teeth and the end surface flatly engaging one of the front flanks with the side surface engaging the back flank of the tooth immediately trailing this one back flank in the loosening direction.

Abstract: A lathe chuck has a chuck body rotatable about an axis and formed with a plurality of angularly spaced and radially extending inner guides and with a plurality of angularly spaced and radially extending outer guides. Each of the inner guides in turn has an axially forwardly directed and radially extending blocking surface and an axially forwardly opening recess at the respective blocking surface. Inner jaws parts are radially displaceable in the chuck body in the inner guides and outer jaw parts projecting axially from the chuck body are radially displaceable therein in the outer guides. An operating element engages the inner jaw parts and jointly radially displaces them between radially inner and radially outer positions.

Abstract: A lathe chuck has a chuck body rotatable about a chuck axis and formed with a plurality of angularly spaced and radially extending inner guides receiving respective inner jaw parts and with a plurality of angularly spaced and radially extending outer guides receiving respective outer jaw parts. An operating element is engageable with the inner jaw parts for radially displacing same in the chuck body in the respective inner guides. Coupling members are axially displaceable in the inner jaw parts and are each displaceable between a coupling position engaging the respective outer jaw part and coupling same to the respective inner jaw parts for joint radial movement and a decoupling position for relative radial diaplacement of the respective jaw parts. Radially displaceable cams in each of the inner jaw parts engage the respective coupling members and are biased by respective springs into radial outer positions in which the respective coupling members are in the coupling position.

Abstract: A lathe chuck has a chuck body rotatable about a chuck axis and formed with a plurality of angularly spaced and radially extending inner guides receiving respective inner jaw parts and with a plurality of angularly spaced and radially extending outer guides receiving respective outer jaw parts. The inner jaw parts can be synchronously radially moved to open and close the chuck. Respective coupling members are provided between the inner jaw parts and the respective outer jaw parts and are rotational about respective coupler axes extending radially of the chuck axis between coupling positions engaging both of the respective parts and coupling same together for joint radial displacement and angularly offset decoupling positions permitting relative radial displacement of the respective parts. Locking elements are operatively engageable between the inner jaw parts and the chuck parts for blocking radial displacement of the inner jaw parts except when the respective coupling members are in the coupling positions.

Abstract: A lathe chuck has a chuck body rotatable about a chuck axis and formed with a plurality of angularly spaced radially extending inner guides receiving respective inner jaw parts and with a plurality of angularly spaced and radially extending outer guides receiving respective outer jaw parts. An operating element is engageable with the inner jaw parts for radially displacing same in the chuck body in the respective inner guides. Coupling members are each axially displaceable by respective radially displaceable cams in the inner jaw parts and are each displaceable between a coupling position engaging the respective outer jaw part and coupling same to the respective inner jaw part for joint radial movement thereof, and a decoupling position for relative radial displacement of the respective jaw parts.