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: The drill chuck has an adapter shaft which is held in the drill chuck nonrotatably with axial motion play and formed for receipt in a tool holder of a hammer drill machine. The hammer action of the adapter shaft is transmittable to the end of a drill held between centrally adjustable clamp jaws through an axial passage. A stop piece is carried in the drill chuck which is movable above the drill chuck axially into a position clamped and locked against the tool holder of the hammer drill machine. Hence axial motion play of the adapter shaft is prevented in both the drill chuck and also in the tool holder and the former is for all intents and purposes rigidly attached with the latter.

Abstract: A keyless chuck comprises a plurality of jaws slidably fitted respectively in bores formed in a body. A substantially cylindrical, first operating component is mounted on the body rotatably and axially movably, and is provided with female threads in engagement with male threads on the respective jaws. A substantially cylindrical, second operating component is mounted on the first operating component for angular and axial movement. A cam device is arranged between the second operating component and an end member fixedly mounted to the rear end of the body. When the second operating component is angularly moved in a first direction, the cam device moves the second operating component forwardly to cause at least one projection provided on the second operating component to move forwardly the first operating component and the jaws threadedly engaged therewith.

Abstract: A hand-held tool for use as a powered drill or screw driver, has a chuck for holding a tool bit, and the chuck is replaceable without employing another tool. A conically shaped shaft section on a rotary spindle fits into a conically shaped bore in a socket section of a part of the chuck. The shaft section and chuck part are secured together by clamping members held in place by a spring. The interconnection affords concentricity and true runout. The rotary spindle is provided with a recess or groove in its outer surface. The groove has an inclined flank closer to the front end of the spindle and the clamping members is biased by the spring against the flank. The spring is displaceable by a gripping sleeve between the biasing position and a released position.

Abstract: A chuck for receiving and holding the shank of a drilling tool includes a chuck member with a central bore. An anvil for transmitting axially directed percussive force extends into a rear end of the central bore. Clamping jaws are movable in guide channels formed in the chuck member extending into the central bore ahead of the anvil for frictionally locking the shank. In the region of the chuck member into which the anvil is located, there is a radially extending passageway through the chuck member extending between the central bore and a guide channel. A retaining member is radially displaceable through the passageway and has a dimension so that it can project outwardly or inwardly from the passageway. When the remaining member extends radially inwardly from the passageway, it can seat within an annular groove in the anvil and hold the anvil in a position so that it does not transmit percussive force.

Abstract: The percussion drill apparatus is comprised of a drill spindle which powers the chuck, and the connection for rotation of the drill chuck to the drill spindle is by way of at least one coupling element which is secured in retainers respectively provided in the drill spindle and the chuck body, but allowing the operating mode with axial shifting or displacement, which mode can be terminated, or selected, by a locking mechanism having a coupling ring. The locking mechanism includes a lock element which is guided in the chuck body and which can project into a longitudinal groove extending axially in the drill spindle. The lock element can be actuated by a control sleeve which surrounds the chuck body and which can be rotated with respect thereto, to be moved, for precluding the axial displacement, into a retainer depression or pocket at the respective upper terminus of the longitudinal groove.

Abstract: A drill chuck can be operated with or without an axial displacement mode with respect to the drill spindle. For operation without the axial displacement mode, lock formations can be moved by way of a coupling ring to engage with a seat portion of a contact sleeve which is fixed to the drill spindle. The lock formations are part of resilient lock strips which are cut from the wall of a lock sleeve secured at the chuck body. The lock formations can be contacted by control projections of the coupling ring. The coupling ring can be moved in axial direction towards the drill spindle so that the contact sleeve is secured due to engagement of the lock formations at the seat portion. At the same time, the chuck body contacts at a spring ring secured to the contact sleeve, and the relative axial movements between the chuck body and the contact sleeve or the drill spindle cannot take place.

Abstract: A drill chuck can be driven by and rotated with a drill spindle. The drill chuck has an axial passage through which the impact effort of a central anvil shaft can be transferred to the drill. The drill can be held in chuck jaws, the movement of which can be controlled by a control sleeve. For connecting the drill chuck at the drill spindle in such a way that they rotate together, there is provided a coupling element and this can allow an axial displacement of the drill chuck at the drill spindle. This mode can be turned off, or on, by use of a locking mechanism and with a coupling ring. The lock mechanism includes a lock element which is axially fixed with respect to the drill spindle, which can be actuated by the coupling ring. The coupling ring can be axially shifted but it can be fixed so as not to rotate. The lock element can be moved into respective recesses arranged circumferentially at the chuck body for precluding axial displacement of the chuck body.

Abstract: A hammer drill chuck according to the invention has a chuck body centered on an axis and formed with an axially forwardly open hole normally receiving a drill bit, respective jaws displaceable in the body and having front ends radially engageable with a bit in the hole, and an adjustment ring engaged around the body, fitting with the jaws such that rotation of the ring in one direction advances the jaws in the body and rotation in the opposite direction retracts the jaws for respectively clamping and unclamping the drill bit in the front portion, and formed with axially backwardly directed teeth. A locking sleeve axially displaceable on the body is formed with forwardly directed teeth engageable with the teeth of the ring for rotational coupling of the sleeve and the ring, an axially relatively short, radially inwardly open, and axially forwardly open slot, and an axially relatively long, radially inwardly open, and axially forwardly open slot adjacent the short slot and of a predetermined angular width.

Abstract: A chuck has a chuck body having an outer surface and formed with a forwardly open hole defining an axis and normally receiving a drill bit, a plurality of angularly generally equispaced guide bores extending at an acute angle to the axis and having inner front ends opening in the hole and outer rear ends opening on the outer surface, and respective chip-shedding passages opening radially inward into the guide bores and radially outward on the outer surface. Respective jaws displaceable in the guide bores have front ends engageable with a bit in the hole and radially outwardly directed teeth. An adjustment ring engaged around the body fits with the teeth of the jaws so that rotation of the ring in one direction advances the jaws in the body and rotation in the opposite direction retracts the jaws for respectively clamping and unclamping the drill bit in the hole.

Abstract: A drill chuck having a cylindrical sleeve connected to its bevel gear element and a rearward part of the sleeve being rotatable on a cylindrical portion of the chuck body, the chuck body being formed with a number of localized swellings at the surface of the cylindrical portion to retain the sleeve in position, the swellings having been formed by plastic deformation of the metal of the body part.

Abstract: A keyless tool chuck is disclosed which may be used with most power tools having standard chucks. The jaws of the chuck are displaced and retracted by controlling the rotation of a threaded collar which surrounds the jaws relative to the rotation of the tool shaft and the jaws. This rotation is controlled by displacing a plate so as to control rotation of the collar in a first embodiment. In a second embodiment, rotation of the chuck collar is controlled by a clutch means, and in a third embodiment the rotation of the chuck collar is controlled relative to the jaws by means of vanes which are inserted into a grooved cylinder attached to the chuck collar.

Abstract: A percussion drill has a percussion drill spindle and a drill chuck member which is turned and axially driven by the spindle. The drill chuck member has an axial passage through which the respective percussion action can be transferred from the spindle to that end of the drill which is held between centrically movable and adjustable chuck jaws. The drill chuck member can be axially moved on the percussion drill spindle, and the distance of movement can be limited in the forward direction towards the drill by an abutment. The abutment is formed, on the one hand, by an annular collar which is arranged at the percussion drill spindle and, on the other hand, by an annular shoulder member which surrounds the percussion drill spindle and which is formed in the chuck body. The collar and the shoulder member have opposing surfaces which provide large contact areas during impact or operational strokes.

Abstract: A chuck has a rear chuck part centered on a rear axis and adapted to be secured to the spindle of a drill for rotation about the rear axis, a front chuck part centered on a front axis, and a universal joint interconnecting the two parts for joint rotation about the rear axis with the front axis movable between a position on the rear axis and a position with the front axis intersecting and skew, that is nonparallel, to the rear axis. Jaws on the front chuck part can be radially displaced thereon relative to the front axis to clamp a tool--a tap or drill bit--at the front axis in the front part. A locking element carried on one of the parts is engageable with the other part for holding the parts with the axes coaxial and nondisplaceable relative to each other.

Abstract: A drill chuck for a hammer drill with a plurality of clamp jaws fed in feed channels to engage a drill in a tool holder, the clamp jaws being adjustable by means of a support ring, the support ring bearing a restraining casing having teeth thereon which can engage gearing in the support ring so as to lock it against further rotation. The restraining casing is lockable in two axial positions, in one position in engagement with the support ring, in the other out of engagement with the support ring. The restraining casing is slid into engagement with the support ring in a covering jacket which holds the restraining casing axially tightly so that drilling waste can not impede engagement of the restraining casing with the support ring. Cleaning passages run through the chuck body from the tool holder to the surroundings so that drilling waste will be removed from the tool holder and the chuck interior during drilling operation.

Abstract: A drill chuck is secured on a drill spindle so as to be actuated thereby. The drill chuck has an axial passage through which the impact effect of a central anvil shaft is transferred to the end of the drill held in the drill chuck. The drill chuck can be connected to the drill spindle by coupling elements respectively arranged in coupling retainers of the drill spindle and/or the chuck body. The coupling retainers are axially of greater longitudinal dimension than the coupling elements, and permit axial displacement of the drill chuck. A contact ring which can not be displaced in axial direction presents an annular surface towards a further annular surface at the drill chuck body. Abutment projections can preclude axial displacement of the drill chuck on the drill spindle, and associated abutment recesses are also provided into which the abutment projections fit at least to a depth equivalent to the axial displacement movement of the drill chuck.

Abstract: The chuck for holding a drill bit by its drill bit shaft comprises a chuck body connected to a drive shaft, a mounting opening in the chuck body in which the drill bit shaft is held coaxial with the chuck axis, a plurality of clamp jaws guided in the chuck body so as to be centrally advanceable to and retractable from the chuck axis in the mounting opening, an axial passage in the chuck body between the drive shaft and the mounting opening, through which hammer blows are transmitted to the drill bit shaft found in the mounting opening. In the mounting opening a chuck sleeve is clamped rigidly between the clamp jaws and in the chuck sleeve the drill bit shaft is guided slidably axially.

Abstract: A hammer drill having a drive spindle rotatable about a spindle axis and a hammer displaceable axially in the drive spindle has a chuck in turn having a generally tubular chuck body centered on a chuck axis, formed with an axially centered array of axially backwardly open recesses, and having a central axially extending passage adapted to receive the shank of a drill bit. The body normally is carried on the spindle and receives the shank of the drill bit in its passage with the spindle, shaft, and chuck axes all coaxial. The hammer projects axially forward into the passage and is engageable therein with the bit. A plurality of jaws radially but not angularly displaceable in the chuck body have inner ends engageable with the drill-bit shank. An adjustment ring centered on the chuck axis, rotatable thereabout on the chuck body, and coupled to the jaws can move same radially synchronously and thereby center the bit in the body by engagement of the inner ends with the shank.

Abstract: A drill chuck assembly for a percussion or hammer drill in which the chuck body is mounted on a rotatable drill spindle and the hammer impact is transmitted by a ram through the spindle to the bit retained in the chuck. A coupling ring surrounding a coaxial portion of the chuck body and the spindle has three angular positions in one of which the chuck body can be withdrawn axially from the spindle and in the second and third of which the body is retained on the spindle. Formations between a shoulder of the spindle and the coupling ring come into play in the second position to permit limited axial displacement of the chuck body on the spindle and are effective in the third position to prevent such axial displacement.

Abstract: The drill chuck comprises a chuck body connected to a drive shaft of a drilling drive device so as to deliver hammer blows to the working tool (e.g. the drill) of a hammer drill and the like, a plurality of clamp jaws which axially guide and hold the drill bit centered on the chuck axis, and a catch device which optionally acts to restrain the drill bit from rotary slipping with respect to the chuck body. The chuck jaws are positioned to axially overlap any axially extending working grooves provided in the drill bit shaft. At least one catch device is provided circumferentially between the clamp jaws, is radially movable in the chuck body and is constructed to engage in grooves running axially in the drill bit shaft or not according to the desire of the operator without loosening during drilling.

Abstract: A drill chuck is rotatably driven by a drill spindle, on which the drill chuck is mounted by a plurality of radial lugs so as to prevent relative rotation, these lugs engaging in catch recesses in the drill chuck, which allow axial free play of the drill chuck on the drill spindle, unless prevented by adjusting a shift member mounted adjustably on the drill chuck without contact with and with axial clearance from the drill spindle. The lugs are rigidly connected with the drill spindle and lie axially against adjacent opposing shift member surfaces on both sides of the drill chuck. According to the rotary position of a shift member the lugs press directly on the adjacent shift member surfaces preventing axial free play of the drill chuck on the drill spindle and transmitting the drilling force or they lie opposite indentations in the shift member with clearance from the shift member surface so as to allow axial motion free play.

Abstract: A drill chuck includes a chuck body connected to a drilling spindle and having a tool holding fixture for retaining a drill bit between jaws. Accommodated in the chuck body is a through-passage which leads to the tool holding fixture and through which the impact of the spindle onto the drill bit is transmitted. A tightening ring is rotatable about the chuck body in order to allow loosening and tightening of the drill bit and is connected to an adjusting sleeve which is arranged at a distance to the chuck body to define an annular space therebetween. In order to allow discharge of any dirt penetrating through the jaws and into the tool holding fixture channels are provided between one end of the annular space and the tool holding fixture. The other end of the annular space is connected to the outside so that dirt can be transported through the channels and the annular space towards the outside.

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 keyless chuck gripping device for opening or closing jaws of a chuck of a rotary tool without using a chuck key includes a first portion having a surface extending at least partially around an outer surface of a chuck locking drum. The first portion is attached to a forward housing portion of the rotary tool or the outer surface of the chuck locking drum. A second portion connected to the first portion is urged into frictional or lock engagement with the unattached portion of the rotary tool where manual actuation alters rotational speed of the chuck locking drum relative to the speed of the rotary tool shaft. The second portion maintains the chuck locking drum in a stationary position while the shaft is driven by the motor, enabling the chuck locking drum to turn the chuck jaws in forward or reverse direction.

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 maually operated tool or driver for Allen head screws in which clamping jaws are reciprocated to and from a clamping position by turning of a knurled sleeve. The jaw clamps against a hexagonal operating rod, which can be slid into position through a passageway extending from end to end and through the tool body. This enables the rod to be applied to the tool from either end and militates against the necessity of a predetermined length for the rod. The operating rod fits the socket of the Allen head screw for tightening or loosening it. Flats on the working end of the clamping jaws flatwise engage the side of the rod for insuring against relative turning movement between the rod and the jaws.

Abstract: The chuck comprises a cylindrical body portion attached to the drill motor shaft and formed with inwardly and downwardly inclined slots which holds its jaws. Those jaws carry circumferential threads on their outer surfaces. An internally threaded ring rotatable about the chuck body meshes with the teeth on the jaws and causes them to move downwardly or upwardly as the ring is rotated. The ring is provided with an external groove which is not quite fully circumferential. The chuck body and ring are enclosed by a rotatable sleeve having an internal recess in the plane of the groove only large enough to hold a ball bearing between it and the groove on the ring. The chuck body and sleeve are provided with interlocking means which prevent longitudinal displacement but permit rotational movement therebetween. The chuck is caused to grasp the drill stem by holding the sleeve in hand and starting the drill motor.

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 portable electric drill is provided with a keyless slidable jaw chuck having three slidable jaws provided with externally extending teeth mounted within a chuck body having three slideways for the chuck jaws and a traverse nut rotatable on the chuck body having internal threads engaged with the chuck jaws, and a locking shell slidable relative to the traverse nut so as to rotate together relative the chuck body. Teeth, lugs or other projections on the rearward annular face of the shell selectively matingly cooperate with teeth, lugs or similar projections provided on the drill housing so that, when the shell is slid rearwardly towards the drill housing the shell and traverse nut are held against rotation relative the drill housing upon actuation of the drill to rotate the chuck body, the chuck jaws will be automatically extended or retracted, depending upon the drill rotation direction, to chuck or unchuck a drill bit or other accessory inserted therebetween.

Abstract: An accessory is attached to a reversible electric drill-type tool, i.e., a portable electric drill, for facilitating engagement and disengagement of the shank of a drill or other tool element by the drill chuck. For this purpose, the chuck is provided with a recess in a sleeve thereof. The accessory has a locking device selectively movable between a first position disengaged from the recess and a second position engaging the recess. Such element is supported by a collar carried on a front face of a housing of the tool to permit selective movement of the element between the first and second positions. The collar maintains the locking element in fixed angular relationship with respect to the axis of rotation of the chuck. In the first position, the locking element prevents rotation of the chuck sleeve relative to the housing. In this way, operation of the tool turns in one direction or the other provides respective tightening or loosening of the chuck for engagement or disengagement of the shank.

Abstract: An operator for a Jacobs chuck has an annular support pivoted on the chuck collar for rocking movement about an axis perpendicular to the chuck axis, a gear tooth on the support between the pivot axis and the chuck ring gear which is selectively engageable with the ring gear teeth so that rocking the support causes the gear tooth to rotate the ring gear, and means permitting manual movement of the gear tooth into and out of engagement with the ring gear teeth. The annular support is counterbalanced so its center of mass is on the chuck axis, and a stabilizer normally maintains the support in a plane perpendicular to said axis.

Abstract: An improved chuck for holding an object such as a tool or work piece. The chuck includes circumferentially spaced jaws for grasping an object and a gear mechanism for adjusting the radial position of the jaws to grasp object of varying size. The jaws of the chuck are movable radially outwardly to an open position to permit insertion of an object there between and are adapted to move radially inwardly to an object grasping position. The improvements in the chuck include inclined key threads on the jaws; a rotatable jaw positioning collar around the jaws, including inclined, inwardly extending, circumferentially spaced key threads adapted to cooperatively engage and disengage the key threads on the jaws; a member positioned around the collar for engaging and rotating the collar to engage and disengage the key threads; and, a spring for normally yieldably urging the jaws axially outwardly and radially inwardly when the key threads are disengaged.

Abstract: The drill includes the usual tool spindle driven by reversible motor, and conventional chucking jaws which rotate with the spindle. The jaws are surrounded by an actuator which is drivingly connected to the jaws, and normally rotates with the jaws when the drill is in use. A manually operable control member on the housing is movable between two operating positions in each of which it holds the actuator against rotation, and consequently causes the spindle to move the jaws to bit-locking or bit-releasing positions, depending upon the direction or rotation of the spindle. Whenever the control member is moved from one to the other of its positions it switches the direction of rotation of the motor.

Abstract: A flexible shaft drive for drill chucks is disclosed. The flexible drive of the present invention comprises a flexible shaft for extending between an electric drill and a chuck for holding drills or other tools. A support sleeve is provided which encircles the chuck for rotatably supporting the chuck during use. In a preferred embodiment a bearing is interposed the chuck and the sleeve to aid in supporting the chuck during use.

Abstract: A chuck brake is secured to a hand-held reversibly rotatable drill of the variable speed type having a chuck. The chuck brake permits selective tightening or loosening of the chuck by operation of the drill. Brake shoes surround and are adapted to engage at least a portion of the peripheral surface of a housing of the chuck, being secured to the front of a drill on opposite sides of the chuck. The brake shoes are manually engageable by pinching action of the user for movement between a first position permitting free rotation of the chuck housing and a second position providing friction between the brake shoes and a first area of the chuck housing. In the second position, rotation of the chuck housing in one direction is impeded, as for tightening. The brake shoes are shiftable also toward the drill to a third position in which increased friction with the chuck housing is provided to impede rotation of the chuck housing in an opposite direction, as for loosening of the chuck.

Abstract: The chucking system is used with a machine tool having a spindle which drives a chuck. The chuck-tightening sleeve can be locked to the machine tool frame so that rotation of the spindle causes tightening or loosening of the chuck, depending upon direction of spindle rotation. In this way, key-locking of the chuck is avoided.

Abstract: A speed control device for portable power tools having particular applicability to electric drills. The speed control device is adapted to automatically adjust the speed of the motor in accordance with changes in the diameter of the tool bit used. The device includes a sensor that senses the opening and closing of the jaws of the chuck. The sensor is mechanically coupled to a potentiometer circuit whose output signal is varied in accordance with movement of the sensor. The output signal of the potentiometer circuit controls the firing angle of a thyristor 34, which in turn controls the current supplied to the motor. In addition, the preferred embodiment includes a speed select switch which is connected to the potentiometer circuit to set the appropriate speed range for the motor, given the particular type of work material.

Abstract: A tubular chuck collar with a plurality of teeth circumferentially arranged around the base thereof to form a toothed track is fitted over the inner cylinder of a conventional chuck assembly in spaced relationship to the outer cylinder of the chuck assembly such that the toothed track of the chuck collar opposes the conventional toothed track on the outer cylinder. A securing means releasably secures the collar to the inner cylinder. The toothed track of the chuck collar includes at least one section oriented at an incline relative to the toothed track on the outer cylinder, whereby a bladed instrument such as a screwdriver may be inserted into the gap between the collar and the outer cylinder to simultaneously engage the teeth in both toothed tracks. The screwdriver so inserted is twisted about its longitudinal axis to simultaneously apply opposing torques to the collar and the outer cylinder.

Abstract: A chuck having self-closing jaws, and a key-threaded rotary ring to engage said jaws in working contact with a tool within their grasp or to disengage said jaws so as to permit their free movement. The jaws themselves are such that the act of performing work with a tool held by said jaws increases the holding pressure exerted by said jaws on said tool.

Abstract: Apparatus is provided for opening and closing the jaws of a chuck without the use of a key. This invention is particularly suitable for improving a standard drill chuck so that tools can be easily and rapidly changed without the use of a drill chuck key. In one embodiment of the invention, the first ring element containing a pair of dogs is slidably mounted to the collar of the drill chuck. When the drill is activated and the first ring element is in an upper position, its dogs engage opposing dogs on a stationary second ring element. Relative rotary motion is thereby achieved between the jaws and the collar of the drill chuck which, in turn, tightens the jaws about the tool. Resilient means are provided for yielding to allow the first ring element to be pushed downward by the action of the opposing dogs when the jaws have closed about the tool.

Abstract: In order to improve the holding power of a tool chuck, especially a tool chuck for use with percussion or impact drills, without the use of elastic friction elements that impede intentional opening and closing, the invention describes a tool chuck in which cooperating, preferably conical surfaces disposed respectively, on the stationary collet and the rotating structure of the chuck engage one another when the chuck is closed and clamps the inserted tool. Additional relative rotation imparted to the rotating structure with respect to the collet causes clamping forces to be applied to the inserted tool and further causes the cooperating conical surfaces to be pressed against one another, thereby generating high surface pressures which oppose the unintentional opening of the chuck even during the presence of axial percussion shocks.

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 keyless chuck for attaching a drill bit to the rotary shaft of a drill. A sun gear is fixed to the rotary shaft and coacts with a set of planetary gears to rotate a body member having a plurality of threaded jaw members movably attached thereto. A screw ring member coacts with the jaw members to selectively cause the jaw member to open and close when the jaw members rotate relative to the screw ring member. A ring gear member is attached to the screw ring member and coacts with the planetary gears to allow the screw ring member to normally rotate with the jaw members unless substantial resistance is applied to the ring gear member to hinder its rotation.

Abstract: A drill chuck has a chuck body defining a chuck axis and provided with a plurality of generally angularly equispaced and radially displaceable tool-engaging jaws. A tightening ring and sleeve rotatable on the chuck body about the chuck axis have formations that radially displace the jaws to grip a tool. An eccentric is rotatable on the chuck body about an eccentric axis radial of the chuck axis. This eccentric has an eccentric surface spaced from the ring and engageable via a locking member axially on the tightening ring to lock this ring in the chuck body. This eccentric is rotated about the eccentric axis by insertion of a non-cylindrical tip of the standard chuck-tightening key into a correspondingly shaped recess of the eccentric.

Abstract: A drilling assembly has a drilling tool which is insertable into a collet chuck of a drilling machine and includes an elongated shaft clamped by the collet chuck, and a longitudinally extending portion on the shaft engageable in a slot between two collets of the collet chuck. The longitudinal portion prevents displacement of the drilling tool relative to the chuck in a circumferential direction. A transversely extending portion is further provided on the shaft so as to abut against an end face of the collet chuck when the drilling tool is clamped therein. These portions may be of one piece with one another and may be manufactured by a stamping process.

Abstract: The invention is directed to a chuck for grasping a tool such as a drill bit or the like and adapted to be tightened with the aid of a chuck key. The chuck includes a hollow body defining a longitudinal axis and having a front end for receiving the tool therein. A plurality of elongated jaws are movably mounted in the hollow body. A sleeve is rotatably mounted on the body and threadably engages the jaws to move the jaws in the body to clamp and release the tool whereby substantial radial forces are transmitted to the body by the jaws when the jaws are tightened on the tool. The sleeve extends in the direction of the longitudinal axis of the hollow body to surround the hollow body at the region of the jaws for supporting the body against the radial forces. A gear is provided for coacting with the chuck key to actuate the sleeve to move the jaws for tightening the jaws on the tool.

Abstract: A chuck for hammerdrills and the like is provided with a chuck body; a plurality of jaws on said chuck body for engaging and holding a tool bit; and means connected to said jaws for adjusting the engagement of said jaws with the tool bit, said means comprising a guide sleeve having a main portion with an outer and inner surface, said main portion defining a central axis therethrough, a toothed gear encircled by said sleeve and having a circumferentially extending groove having a roughened surface facing the inner surface of said sleeve, said sleeve including at least one inwardly offset locking portion having an outer and inner surface which are inwardly offset with respect to the main portion of said sleeve, said inwardly offset portion projecting into said groove.

Abstract: A drill chuck including a main body part having jaws slidably mounted for converging movement in respective guides. A nut member is rotatably mounted on said main body part and has screwthreaded engagement with the jaws. A cylindrical sleeve is connected at one end to the nut member and at its other end surrounds a portion of a further body part. The further body part, which is provided with mounting means for connecting the chuck to a power tool driving spindle, has an initial degree of co-axial alignment with the main body part but a self-centering action is allowed when drilling.

Abstract: A drill chuck of the angularly sliding jaw type having an integral nut and bevel gear element formed as an unbroken ring and then split in halves, the halves being held together by a chuck sleeve; and the teeth of the bevel gear being "blind", that is, to say the teeth are connected at their radially inner ends by an integral strengthening collar. The collar forms one of two bearing faces to maintain axial alignment of the integral nut and bevel gear element in the chuck body element.