Abstract: A drill assembly has a drill housing, a spindle projecting from the housing along an axis and rotatable about the axis, a chuck body fixed on the spindle, jaws on the chuck body, and a rotatable tightening body. The jaws move radially together on rotation of the tightening body in the forward direction on the chuck body and radially apart on rotation of the tightening body in the reverse direction on the chuck body. A setting element rotationally fixed on the drill housing is displaceable axially on the chuck body between axially offset end positions and formations between the setting element and the tightening body rotationally couple the setting element with the tightening body only in one of the end positions of the setting element. A latching element on one of the bodies can move between a locking position engaging the other of the bodies and arresting the tightening body rotationally on the chuck body and an unlocking position disengaged from the other body.

Abstract: The chuck is used with a drill drive unit having a spindle extending along and rotatable about an axis. The chuck has a chuck body fixed on the spindle and formed with an axially forwardly open tool recess on the axis, a plurality of angularly spaced and angled guide holes opening into the recess and having inner surfaces, and a respective grit-clearing passage opening at a respective front end into each of the guide holes axially rear-ward of the recess. Respective jaws displaceable in the guide holes have outer surfaces riding on the inner surfaces of the respective guide holes and have front ends in the recess. An adjustment sleeve is rotatable about the axis on the body and interengaging formations on the sleeve and on the jaws displace the jaws radially on rotation of the sleeve about the axis.

Abstract: A lockable drill chuck has a chuck body and an adjustment body rotatable on the chuck body relative to an axis and fixed axially thereon. Respective jaws in guides of one of the bodies have toothed edges meshing with a screwthread of the other body so that rotation of the adjustment body on the chuck body in a forward closing direction about the axis moves the jaws radially toward one another and opposite rotation in an opening direction moves the jaws radially apart. Radially inwardly directed sawteeth is provided on the adjustment body. An elastically deformable locking arm fixed on the chuck body has a free outer end and sawteeth offset from the free end and engageable with the adjustment-body teeth. The arm is radially deflectable between an outer meshed position with the locking-arm sawteeth meshing with the adjustment-body sawteeth and an inner out-of-mesh position.

Abstract: A drill chuck has a first body rotatable about an axis and formed with a plurality of angularly spaced angled guides, respective jaws slidable in the guides, and a second body axially fixed but rotatable on the first body. Interengaging screwthread formations on the second body and engaged with the jaws radially displace the jaws on the first body toward each other on forward rotation of one of the bodies relative to the other body in a tightening direction and radially displace of the jaws away from each other on opposite backward rotation of the one body relative to the other body in a loosening direction. A locking ring axially displaceable on the other body is formed with at least one tooth and the one body is formed with another tooth axially meshable with the locking-ring tooth in a front locking position of the locking ring to inhibit rotation of the bodies relative to each other. A holding ring axially fixed on the other body is rotatable thereon between angularly offset locked and unlocked positions.

Abstract: A self-tightening chuck has a chuck body centered on an axis and adapted to be rotated thereabout, a plurality of jaws radially displaceable on the body, and an adjustment sleeve rotatable on the body, formed with radially inwardly directed teeth, and engaged with the jaws such that rotation of the adjustment sleeve on the body in a forward direction displaces the jaws radially inward on the body and opposite rotation in a reverse direction displaces the jaws radially outward. A tightening ring rotatable on the body has stop formations for limiting its rotation on the body to a predetermined angular travel and a tightening spring braced angularly between the tightening ring and the body urges the tightening ring angularly in the forward direction. A locking body radially displaceable on the tightening ring is formed with teeth meshable with the tightening-ring teeth. A locking spring braced radially against the locking body urges the locking-body teeth into mesh with the adjustment-sleeve teeth.

Abstract: A drill chuck has an axially centered chuck body, an adjustment body rotatable but axially fixed on the chuck body, and jaws radially displaceable on the chuck body. The adjustment body is formed with a screwthread meshing with teeth of the jaws so that relative rotation of the bodies in a tightening direction moves the jaws together and opposite rotation moves them apart. A radially outwardly projecting tab fixed on the chuck body has a pair of angularly oppositely directed end faces and a locking ring axially displaceable on the chuck body between freeing locking positions is formed with an inwardly open pocket receiving the tab and having a pair of angularly confronting end faces engageable with the respective end faces of the tab and spaced angularly apart by a distance substantially greater than the tab width. A tightening spring connected between the locking ring and chuck body urges the locking ring in the tightening direction.

Abstract: A self-tightening hammer-drill chuck has a chuck body centered on and rotatable about an axis, a guide rotatable about the axis on the body, and a plurality of jaws radially displaceable on the guide and engaged with a screwthread of the body so that rotation of the guide in a forward tightening direction on the body moves the jaws radially together and opposite rotation moves them apart. A ring formed with an annular row of teeth is axially nondisplaceable on the bodies and angularly spaced abutment formations fixed on the guide are engageable with the ring. A tightening spring urges the ring angularly in the forward direction on the guide. A holding sleeve axially displaceable on the body has an annular row of teeth meshable in a locking position with the teeth of the ring. A return spring urges the holding sleeve axially into the locking position.

Abstract: A drill chuck has a body centered on and rotatable about an axis, a plurality of jaws radially displaceable on the body, and an adjustment ring rotatable but not axially displaceable on the body and having a screwthread engaging the jaws for radially displacing the jaws when the adjustment ring is rotated on the body. A locking sleeve rotatable on the body at most through a small acute angle is axially displaceable on the body between a freeing position and a locking position. The locking sleeve and adjustment ring are formed with axially interengageable teeth that mesh only in the locking position. A spring braced between the locking sleeve and the body urges the locking sleeve into the locking position. A holding ring limitedly axially displaceable on the body is axially engageable with the locking sleeve. A pair of angularly spaced abutments on one of the rings and a part on the other ring permit only limited relative angular movement of the rings between a pair of angularly offset positions.

Abstract: A drill chuck for use with a tool having a shaft has a chuck body centered on and rotatable about an axis and an adjustment body centered on the axis, rotatable about the axis on the chuck body, and axially fixed on the chuck body. One of the bodies is formed with a plurality of angularly equispaced jaw-guide passages centered on respective jaw axes all lying on the surface of an imaginary cone centered on the axis. The other of the bodies is formed with a screwthread centered on the axis and exposed in the guide passages. Respective jaws displaceable in the passages along the respective axes are each formed with a row of teeth meshing with the screwthread so that relative rotation of the bodies in one direction moves the jaws radially inward and axially forward and opposite relative rotation moves the jaws radially outward and axially backward.

Abstract: A drill chuck has a body centered on and rotatable about an axis, a plurality of jaws radially displaceable on the body, an adjustment sleeve rotatable but not axially displaceable on the body and engaging the jaws for radially displacing same, and a locking ring rotatable on the body at most through a small acute angle and axially displaceable on the body between a freeing position and a locking position. The locking ring and adjustment sleeve are formed with axially interengageable teeth that are meshed in the locking position of the locking ring and that are out of engagement with each other in the freeing position of the locking ring. An actuating ring is rotatable but not axially displaceable on the body adjacent the locking ring.

Abstract: A power chuck has a stationary housing, a chuck spindle rotatable in the housing about a chuck axis, a plurality of jaws carried on the chuck body movable radially toward and away from one another, an actuator shaft movable axially relative to the body, a jaw actuator connected between the actuator shaft and the jaws for displacing same radially outward on displacement of the element in one axial direction and for displacing the jaws radially inward on opposite axial displacement of the shaft, and a motion converter carried on the spindle.

Abstract: A power chuck has a stationary housing, a chuck spindle rotatable in the housing about a chuck axis, a plurality of jaws carried on the chuck body movable radially toward and away from one another, an actuator shaft movable axially relative to the body, and a jaw actuator connected between the actuator shaft and the jaws for displacing same radially outward on displacement of the element in one axial direction and for displacing the jaws radially inward on opposite axial displacement of the shaft. The jaws, shaft, and jaw actuator are rotatable about the axis relative to the spindle.

Abstract: A drill chuck according to this invention has a chuck body centered on and normally rotatable about a chuck axis and formed centered on the axis with a plurality of angled guide passages each having an axially forwardly open front end and an axially rearwardly and radially outwardly open rear end, respective jaws displaceable in the guides, projecting from the front ends thereof, and formed with teeth exposed at the respective guide-passage rear ends, and an adjustment sleeve axially fixed on the body and rotatable thereon and formed with an internal screwthread meshing with the teeth of the jaws so that rotation of the sleeve in one direction advances the jaws and opposite rotation retracts them. A grip ring on the chuck body centered on the axis axially forward of the adjustment sleeve has an exposed outer surface provided with grip-enhancing formations. Formations on the body and on the grip ring axially and rotationally fix the grip ring on the chuck body.

Abstract: A drill chuck has a chuck body centered on and adapted to be rotated about a longitudinal axis and formed with a plurality of forwardly open angled guides angularly spaced about the axis, respective jaws displaceable along the guides in the chuck body and each formed with a row of teeth, and a tightening collar rotatably surrounding the body, formed internally with a screwthread meshing with the teeth of the jaws, and forming with the chuck body an annular space axially forward of the screwthread so that rotation of the collar in one direction moves the jaws radially together and opposite rotation moves them radially apart. A locking element axially displaceable in the space and nonrotatable on the chuck body is biased backward into axial engagement with the tightening collar to brake rotation of same.

Abstract: A drill chuck has a chuck body centered on and adapted to be rotated about a longitudinal axis and unitarily formed with a plurality of forwardly open angled guides angularly spaced about the axis and an axially forwardly directed shoulder. Respective jaws displaceable along the guides in the chuck body are each formed with a row of teeth and a tightening sleeve rotatably surrounds the body and has an axially rearwardly directed shoulder. An inner ring rotatable on the body about the axis is formed internally with a screwthread meshing with the teeth of the jaws so that rotation of the inner ring in one direction moves the jaws radially together and opposite rotation moves them radially apart. This inner ring bears axially forward on the shoulder of the sleeve and axially backward on the shoulder of the body. Interengaging formations rotationally couple the inner ring to the sleeve and a retaining element axially fixed on the chuck body forward of the inner ring bears axially backward on the sleeve.

Abstract: A hammer-drill chuck has a chuck body, a sleeve rotatable but axially nondisplaceable on the chuck body, and a plurality of jaws engaged between the sleeve and chuck body. A locking-ring body is axially displaceable between a rear unlocked position and a front locking position on the chuck body. A pin is radially displaceable in and extends radially from one of the bodies toward the other body and this other body is formed with an angularly extending slot having angularly opposed and spaced end surfaces and with a plurality of angularly spaced abutments. Thus when the pin is engaged in the slot it limits relative angular displacement of the bodies. The other body also has an axially backwardly extending cutout opening axially forward into the slot adjacent one of the end surfaces thereof at a mouth having an angular dimension generally equal to the pin width.

Abstract: A machine tool has a housing normally rotated about a housing axis and a part that is axially movable relative to the housing to adjust the tool. An adjustment apparatus for the tool has a drive having a rotary drive output, a differential transmission having a rotary input connected to the drive output and a pair of transmission outputs. This transmission includes a reverser for rotation of one of the transmission outputs opposite that of the other transmission output. Respective wheels coupled to the transmission outputs are rotatable coaxially on the tool housing and respective screws are rotationally coupled to the wheels, axially fixed on the tool housing, and both threaded in the movable part of the machine tool. According to this invention one of the screws is of opposite hand to the other screw.

Abstract: A power actuator has a hollow cylinder housing generally centered on an axis, a piston axially displaceable but non-rotatable in the housing and defining therein a pair of axially opposite pressurizable compartments, and a piston stem centered on the axis, fixed to the piston, extending axially from the piston, and formed with a pair of separate feed passages each having one end opening into a respective compartment and an opposite end opening axially on the stem. A distributor body rotatable about the axis on the stem at the opposite ends of the passages but axially nondisplaceable on the stem is provided with respective connections communicating with the opposite ends. Thus the compartments can be pressurized via the respective passages and connections for axial movement of the piston and stem in the housing. A pair of axially spaced guides are fixed on the distributor body and a bearing has a race axially rotatable on the housing about the axis but axially nondisplaceable on the housing.

Abstract: A self-tightening drill chuck has a chuck body adapted to be mounted on a drill spindle for rotation about an axis and a tightening sleeve surrounding the body and formed with a substantially frustoconical seat centered on the axis and having a front end turned away from the chuck body and formed with a plurality of radially inwardly open, angularly offset, and axially extending grooves. The sleeve is secured on the chuck body for rotation about the axis thereon but against axial movement thereon. A jaw guide in the sleeve formed with a plurality of axially forwardly open and angularly spaced slots has a front end formed with respective radially outwardly projecting ridges engaged in the grooves. Respective jaws are axially and radially displaceable in the slots and on the seat.

Abstract: Clamp jaws are arranged symmetrically about a rotation axis in a chuck body and guided in a direction inclined to the rotation axis. A tightening ring is mounted rotatable and axially nonslidable on the chuck body and is provided with a tightening thread for moving the clamp jaws which is engaged with a row of teeth on each of the clamp jaws. An opening for connection of a drill spindle is located in the tightening ring. As seen in a direction running from the drill spindle to the clamp jaws, the tightening thread has a direction of rotation, by which the clamp jaws are moved toward the drill tool or tighten on the drill tool in clockwise rotation of the tightening ring on the chuck body. Thus the drill chuck has aftertightening and selftightening properties.