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 rotatable about an axis and formed with a plurality of guides angularly equispaced about the axis, respective jaw displaceable axially in the guides, an adjustment body rotatable about the axis on the body, and screwthreads coupling the adjustment body with the jaws for axial forward movement of the jaws on the body on rotation of the adjustment body on the chuck body in one direction and opposite axial backward movement on opposite relative rotation of the bodies. An indicator element is provided between the chuck and adjustment bodies. A screwthread coupling centered on the axis is provided between the element and one of the bodies and a translatory coupling is provided between the element and the other of the bodies. Thus the indicator element moves in a straight line relative to the other body on relative rotation of the bodies.

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.

Abstract: The chuck body is centered on the power tool drive spindle by placing the smooth bore in the body over the smooth cylinder on the spindle with the recesses on the body axially moved onto the lugs (splines) on the shoulder of the spindle. The retaining screw is threaded into the end of the spindle and the screw head forces the chuck body against the shoulder. Neither the screw nor the bore/cylinder transmit torque; only the drive lugs transmit torque so the chuck can't jam on the spindle. This mount works with keyed chucks or keyless chucks as illustrated where the three inclined jaws are threadably engaged by split nut having a retainer pressed thereon. A clutch sleeve is biased rearward from the split nut and is moved towards the nut to engage interference lugs on the sleeve with lugs on the nut to restrain nut rotation to open or close the jaws. As the jaws approach full open, they push the sleeve to disengage the lugs. A spline coupler restrains sleeve rotation but can be omitted.

Abstract: A keyless chuck for fastening or releasing a tool, in which a plurality of oblique holes are formed in a body, jaws are inserted into these holes, and a nut engaging with rear portions of the jaws is rotated in a normal or a reverse direction so that the jaws either advance or retreat. This keyless chuck is provided with a grip member loosely fitted around the outer periphery of the body, a pair of opposed groups of lugs provided on the nut and the grip member and capable of engaging with or disengaging from each other, and at least one spring provided on one of the groups of engaging portions and adapted for constantly urging this group of engaging portions toward the other. If the grip member is fixed, the nut is rotated in the opposite direction relative to the body so as to make the jaws advance or retreat, thereby fastening or releasing the tool.

Abstract: A self-actuating keyless chuck for use with a reversible powered driver is disclosed. The chuck comprises a body which carries a rotatable split nut and a plurality of slidable jaws driven by the rotatable nut. A sleeve member is rotatably connected to the body and carries an impact ring provided with a first impact dog. A second impact dog is associated with the split nut. Spring means are provided to bias the first impact dog toward engagement with the second impact dog whereby the jaws will be tightened or loosened whenever the rotation of the sleeve is restrained and the powered driver is actuated.

Abstract: A hand tightenable chuck for holding a cutting implement in place has been developed. The chuck uses two screw systems to achieve the proper degree of tightness; a first system providing a coarse tightening or pinching of the shaft and a second providing a clamping action. The combination of screw systems eliminates the need for the key used to tighten conventional chucks.

Abstract: A pistol grip, bone drill with a lever lock for convenient locking of the drill chuck for manipulation of the chuck jaws, particularly for facilitating advances of the drill bit, the bone drill having a contoured pistol grip handle with a hand crank for rotating an elongated drill barrel by a conventional bevel gear mechanism, the drill barrel having an end chuck with a connected revolver cylinder having engagement holes for receiving a locking pin displaced by the lever lock.

Abstract: A compact keyless chuck having means therein for isolating inasmuch as possible, impact and abrasion on an operator's hand normally encountered when the chuck jaws bottom, for example, about a rotatable work tool. A free floating sleeve, rotatable and slidable with respect to the chuck encircles the same and is provided with a surface thereon for implementing actuation of the tightening or loosening of the rotatable work tool upon motorized operation of the machine spindle.

Abstract: A drill chuck consists of a two-piece housing, a two-piece insert and a cage for a plurality of jaws. The two pieces of the housing are threaded together. The rearward piece thereof is a fastening sleeve. The two pieces of the insert are in threaded driving engagement. The front piece is held against rotation and is only shifted axially in order to open or close the mouth formed by the jaws. The rearward piece of the insert is held against axial displacement and can be rotated by inserting a key through a bore of the housing from the rearward side thereof.A drill can be clamped in the chuck and then the chuck with the clamped drill can be inserted in a driving shaft of a drilling machine.

Abstract: A drill chuck has a chuck body provided with jaws that are surrounded by a tightening sleeve which can be rotated on the body to tighten or loosen the jaws. This sleeve has an array of radially inwardly projecting sleeve teeth spaced above an annular surface on the body and normally bearing downwardly on top of similarly constituted teeth of a bearing ring bearing via balls on this bearing surface of the body. The bearing ring can be fitted underneath these teeth bayonet-fashion by passing its teeth through the gaps between the teeth of the sleeve and then rotating it. Thereafter a locking element having fingers engaging axially in the gaps between the teeth of the ring and the sleeve locks these two elements rotationally together.

Abstract: A chuck has a tightening sleeve rotatable on a chuck body about the chuck axis to radially displace a plurality of tool-clamping jaws on the chuck. A bolt is slidable radially in the chuck between an outer position engaged between teeth at the edge of the tightening sleeve preventing rotation of this tightening sleeve relative to the chuck body, and an inner position permitting such rotation. This bolt is urged radially outwardly by a spring and can be radially displaced inwardly when a key is fitted to the chuck to tighten or loosen it.

Abstract: A drill chuck arrangement for connecting a drill bit to a spindle of a drilling machine comprises a spindle member threaded onto the spindle, and a jaw-actuating member mounted at least in part about the spindle member for concentric turning about the latter. A plurality of opposed clamping jaws are movable towards and away from each other in response to the aforementioned concentric turning. The spindle member has a radial bore which receives a portion of an actuating tool having beveled gear means. Upon turning the tool, the beveled gear meshes with a cooperating gear on the jaw-actuating member so as to turn the same relative to the spindle member, and thereby clamp or release a drill bit inserted in between the clamping jaws. A bushing is provided intermediate the spindle member and the jaw-actuating member to prevent binding between these members.

Abstract: A chuck with key tightening, for a machine such as an electric drilling machine, comprising gripping means for gripping a tool such as jaws, which are guided in a translatory movement in grooves which are inclined with respect to the longitudinal axis of the chuck and which are machined in the chuck body, the chuck being characterized in that it comprises a toothed ring to which a tightening nut is connected, the nut cooperating with the threads of the gripping means, the toothed ring being provided in the region of its teeth with at least one retaining region whose internal diameter is smaller than the external diameter of the tightening nut, at least one component or at least one group of components having the same function, movable with respect to the chuck body, that is to say, the jaws and/or the nut and/or the toothed ring, being of sintered metal.

Abstract: A drill chuck having converging slidable jaws which are extendible and retractible relative to the body of the chuck by means of a key operable bevel gear part and an associated nut rotatable relative to the body, together with a driving component for the chuck for detachably mounting the chuck to the spindle of a power tool, and further provided with means for producing a self-centering action between the body part and the driving component. Various modifications of the components of the chuck, particularly the nut, bevel gear part, driving component and the self-centering means are also disclosed.

Abstract: A chuck has a chuck body adapted to be rotated about an axis and formed with an axial passage having a seat on which three jaws are slidable to grasp a tool shank. A tightening ring is formed on its inner periphery with threads that engage threads on the jaws to displace them axially. A cylindrical sleeve has one end resting on an outside ledge formed on the ring and is deformed at this one end into a groove on the ring which has a sharp edge that bites into the sleeve.

Abstract: A drill chuck having a rotatable nut member for advancing and retracting converging jaws, and provided with passages for feeding lubricant to the groove in which the nut is rotatable. And a method of assembling the components of the chuck in dry condition and subsequently feeding lubricant through the passages to the groove in which the nut is rotatably mounted.