Abstract: A tool driver includes a housing and a rotatable drive shaft extending therefrom. A chuck for holding the tool includes a generally cylindrical body member having a nose section and a tail section. Each of a plurality of jaws is slidably positioned in one of a plurality of angularly disposed passageways in the body. Each jaw has a jaw face and threads formed thereon. A nut is in operative communication with the drive shaft so that the drive shaft rotationally drives the nut. The nut engages the jaw threads so that rotation of the nut moves the jaws axially within the passageways. A locking mechanism is mounted to at least one of the housing and the body and is selectively actuatable to a first operative position and a second operative position. In the first position, the locking mechanism rotationally locks the housing and the body with respect to each other. In the second, it permits relative rotation between the body and the housing.

Abstract: The tool drive system for use with a chuck having a throughbore including an outer bore portion for receiving a tool or tool holder and an inner bore portion constructed to receive and be mounted on an outer end of a motor shaft of a power tool comprises: an insert received in the inner bore portion; structure for preventing rotation of the insert relative to the chuck; structure on the insert for engaging an inner end of a tool or tool holder; and a mechanism for holding the tool or tool holder against axial movement relative to the insert.

Abstract: A molded chuck for a hand or powered driver including oblique jaws movable by rotation of a threaded nut engaged therewith to selectively clamp and release a tool.

Abstract: A drill chuck has a body element formed of fiber-reinforced plastic, centered on and rotatable about an axis, and formed centered on the axis with a rearwardly open spindle hole and a forwardly open tool hole. A ring element is axially fixed but rotatable about the axis on the body element and one of the elements is formed with a plurality of angled guide passages opening axially forward into the tool hole and the other of the elements is formed centered on the axis with a screwthread exposed in the passages. Respective jaws axially and radially displaceable in the passages are each formed with a row of teeth meshing with the screwthread so that rotation of the ring element in one direction displaces the jaws toward one another and opposite rotation displaces them away from one another.

Abstract: A keyless chuck having an outer chuck with spaced grooves, an inner chuck and chuck jaws, where the keyless chuck is mounted on an output shaft of a drill motor. A sleeve locking device mounted between the outer chuck and the drill motor housing, where the sleeve locking device has spaced inner teeth to engage the spaced grooves of the outer chuck to lock the outer chuck stationary, allowing the inner chuck to rotate and opening or closing the chuck jaws to install and remove drill bits.

Abstract: A molded chuck for a hand or powered driver including oblique jaws movable by rotation of a threaded nut engaged therewith to selectively clamp and release a tool.

Abstract: An object of the present invention is to provide a chuck assembly which may make better the axis vibration precision of the tool and the grip rigidity of the tool. The chuck assembly wherein a plurality of jaws (2) each of which has an axis L.sub.2 slanted relative to an axis L.sub.1 of a chuck body (1) are provided on the chuck body (1), a male screw portion (2a) provided on each jaw (2) is engaged with a female screw portion (4a) of a rotatable nut member (4) provided on the chuck body (1), and the nut member (4) is rotated to open/close and advance/retract the jaws (2) to grip a shank (5a) of a tool (5) is characterized in that a cross-sectional shape of the tool grip portion of each jaw (2) is defined so as to grip the shank (5a) of the tool (5) by either one of the two corner portions B and H located in a right and left symmetrical condition relative to an axis L.sub.3 of the tool (5) and/or two non-corner portions C and G located in a right and left symmetrical condition relative to the axis L.sub.

Abstract: A chuck has a chuck body formed centered on an axis with a rearwardly open hole adapted to receive a drill spindle and with a plurality of axially forwardly and axially rearwardly open guide passages, an adjustment ring axially fixed but rotatable about the axis on the chuck body and formed with an internal screwthread, and respective jaws displaceable in the passages between axially front and radially closely spaced positions and axially back and radially widely spaced positions and having teeth meshing with the screwthread. The jaws project in the back positions rearward from the chuck body axially rearward past the hole receiving the spindle so that rotation of the ring in a forward direction on the chuck body displaces the jaws axially forward and radially inward and opposite rotation of the ring in a reverse direction on the chuck body displaces the jaws axially rearward and radially apart.

Abstract: A chuck device for use with a manual or powered driver has a body member with a plurality of angularly disposed passageways formed therethrough. A jaw is slidably positioned in each passageway. Each jaw has a tool engaging face formed on one side and threads formed on the opposite side. The jaws are threadedly engaged with a rotatable nut mounted on the body member. A sleeve member is in rotational engagement with a nut whereby rotation of the sleeve causes the nut to rotate and the jaws to advance or retract within their respective passageways. Each jaw and its respective passageway has a unique matching profile different from the other jaws and respective passageways so that the jaws cannot be interchanged with different passageways in the chuck.

Abstract: A keyless drill chuck includes a raising-and-lowering member which moves back and forth with reference to a shaft in order to secure a rear portion of the cutting tool, and jaws which grip the cutting tool in association with the movement of the raising-and-lowering member toward the jaws while the internal diameter of a circle defined by the jaws. The rear portion of the cutting tool is automatically gripped without the use of a chuck handle by means of a machining resistance transmitted to the jaws from the cutting tool and of the movement of the raising-and-lowering member caused by torsional torque transmitted to a shaft. A V-shaped recess is formed in the end of the raising-and-lowering member facing the jaws, so that the rear portion of the cutting tool can be removable, yet attached to the V-shaped recess.

Abstract: A new drill bit adapter for permitting use of drill bits which do not fit on a drill chuck which is provided with an electric drill. The inventive device includes an adapter chuck having a chuck body and an adapter shaft extending from an end of the chuck body. The shaft is sized for being retained by the drill chuck on the electric drill. The opposite end of the chuck body retains drill bits of a size which cannot be retained by the drill chuck. The drill bits are retained by a key operated retaining system, or by a hand tightened system, both of which are conventional.

Abstract: A chuck assembly for use with a rotary tool includes a chuck mechanism having a plurality of spaced apart jaws. The jaw spacing is adjusted by rotation of an adjustment ring. A sleeve encircles and is affixed to the adjustment ring. A plurality of spaced apart ribs radially extend from the sleeve. An elastomeric grip extends generally circumferentially about the sleeve. The ribs radially protrude from the grip at a plurality of openings defined by the grip. The ribs lie in outboard shielding relationship to the grip to protect the grip from excessive wear and damage due to contact with other objects during operation of the rotary tool.

Abstract: A chuck for use with a manual or powered driver including a nut rotatably mounted on the chuck body and in engagement with the threads of the chuck jaws. Aspects of the chuck jaws, such as the jaw face, are manipulatively formed by selective redistribution of metal. Formation of the chuck jaws in this manner is distinguishable from jaws formed by prior art machining techniques due to the structural orientation of grain in the metal. Forming of the chuck jaws preferably occurs at low applied temperature, i.e. not exceeding 1000 degrees Fahrenheit.

Abstract: The machine-tool drill chuck is comprised of a main cylindrical hollow body (2) linked by its rear end (13) to the machine tool and provided at its front end (15) with a front conical socket (7), inside which is located another socket (9) carriying clamping jaws (8) for holding the drill and which are subject to the action of a pushing screw (6) which is coaxial with the main body. Windows (12) are arranged as through openings in the main body. In each of the windows there is arranged a satellite gear (4) whose axis is parallel to the axis of the main body (2) and whose diameter is substantially larger than the thickness of the main body wall. The satellite gears are in mesh with the external toothing of a central gear (3) and with the internal toothing of an external ring (5) which may be actuated manually or with a key. Said central gear is also internally in mesh with the pushing screw.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft is provided. A plurality of jaws are slidably positioned in a body member. Each jaw has a jaw face formed on one side and threads formed on the opposite side. Each jaw face includes a first ridge substantially parallel to the chuck axis. The first ridge is offset from, and substantially parallel to, a plane including the jaw axis and the chuck axis. A second ridge is substantially parallel to the first ridge but offset from the plane opposite the first ridge. A third ridge is disposed between the first and second ridges and has a peak on the opposite side from the chuck axis of a plane including the peaks of the first and second ridges.

Abstract: A drill chuck has a body provided centered on an axis with an annular array of teeth and a plurality of jaws radially displaceable relative to the body between inner and outer positions. A tightening ring is axially fixed but rotatable about the axis on the body in a tightening direction and in an opposite loosening direction and a pair of screwthread formations between the tightening ring and the jaws move the jaws radially together on rotation of the tightening ring in the tightening direction and radially apart on rotation of the tightening ring in the loosening direction. A locking member engageable with the teeth and angularly fixed on the tightening ring is radially displaceable between a locking position engaging the teeth and preventing rotation of the body in the loosening direction and a freeing position permitting free rotation of the body relative to the tightening ring. A setting ring angularly displaceable on the tightening ring is formed with a pair of angularly spaced and radially open seats.

Abstract: A precision drill sharpener and grinding wheel assembly is provided, as is a corresponding drill chuck for use with the drill sharpener, in which the drill sharpener includes a lever and spring clip alignment subassembly for properly positioning a drill in the drill chuck, and sharpening ports for sharpening the drill and splitting the drill tip, the sharpening ports being positioned such that a single grinding wheel assembly is used to both sharpen the drill and split the tip. The drill sharpener uses a small diameter grinding wheel operated at high speed to provide cutting rates comparable to large industrial sharpeners. The drill chuck is of short length, relative to most of the drills to be sharpened, and is open at a back end, enabling the manipulation of the drill by its shank relative to the drill chuck when disposed in the alignment subassembly.

Abstract: A chuck for use with a manual or powered driver including a nut rotatably mounted on the chuck body and in engagement with the threads of the chuck jaws. Aspects of the chuck Jaws, such as the jaw face, are manipulatively formed by selective redistribution of metal. Formation of the chuck jaws in this manner is distinguishable from jaws formed by prior art machining techniques due to the structural orientation of grain in the metal. Forming of the chuck jaws preferably occurs at low applied temperature, i.e. not exceeding 1000 degrees Fahrenheit.

Abstract: A main body formed generally as a hollow cylinder has an open end sized to receive a chuck head into the main body. An outer shell formed generally as a hollow cylinder is mounted to the main body. A gear drive assembly is mounted to the main body and engaged with the face gear of the chuck. The outer shell is selectively manually engagable with the outer shell via a the gear drive assembly such that rotating the chuck head opens or closes the jaws of the chuck, depending upon the direction of rotation. The outer shell has a free wheeling position in which a person may grasp the outer shell and hold it to guide the drill without causing the chuck jaws to tend to open or close.

Abstract: A chuck assembly for a tool bit includes a hollow chuck body which has a front end formed with a locking portion and which is formed with at least one radial opening therethrough, a cylindrical push member which is disposed slidably in the chuck body and which is formed with an external screw thread, a hollow truncated cone-shaped seater which is disposed in front of the push member and which is formed with a plurality of angularly spaced and longitudinally extending slits, a plurality of elongated clamping members which extend slidably and respectively into the slits and which have rear ends connected to the push member, a hollow truncated cone-shaped front cap which encloses the seater and which has a rear end connected to the locking portion of the chuck body, and a drive ring which is provided rotatably around the chuck body and which is formed with an internal screw thread that meshes with the external screw thread of the push member.

Abstract: To provide a chucking apparatus which may impart a sufficient cutting force and an axial holding force to a tool, concave/convex portions which are engaged with each other are formed in a proximal end of the tool and a contact portion with which the proximal end of said tool is brought into contact when said tool is mounted on said chucking apparatus, and an angle defined by rising walls and end faces of the concave/convex portions which face each other is set at an acute angle.

Abstract: A plastic grip boot for a metal part of a chuck, typically a keyless chuck, is disclosed. The grip boot is insert molded to a rotatable metal part of a chuck, the metal part extending under the grip boot for the axial length of the grip boot which is normally gripped by the user in order to provide support to the grip boot. During molding, the plastic preferably flows into surface features of the metal part to help secure the grip boot to the metal part. The grip boot improves user grip of the metal part during operation of the chuck to adjust the spacing of the chuck jaws.

Abstract: A removable nosepiece for a chuck includes a plastic and/or metal ring which is removably mounted on a distal portion of either the main body or a sleeve of the chuck so that the ring is concentric with the central longitudinal axis of the chuck. The removable nosepiece may include a washer-shaped member of rubber extending radially inwardly from the plastic and/or metal ring. If provided, the rubber washer resiliently engages and centers a tool inserted into the chuck through the central aperture of the washer.

Abstract: On a chuck, the clamping jaws can be adjusted axially by means of an internally threaded sleeve of a jackscrew actuator in one direction for clamping and in the other direction for release. When the jaws are adjusted in the clamping direction, the clamping jaws are moved radially inward by interaction with a jaw convergence sleeve; for an axial movement in the release direction, the clamping jaws are moved radially outward by interaction with jaw expansion means attached inside the jaw convergence sleeve. The internally threaded sleeve is designed on its one end as an expansion cage for the clamping jaws lying inside the convergence sleeve, and is centered by an adjacent sleeve extension in the base unit. The internally threaded sleeve is guided both inside the expansion cage and inside the sleeve extension centering on the guide sleeve.

Abstract: A removable nosepiece for a chuck or other similar tool holder has an outer ring of relatively hard and inflexible material such as plastic and/or metal and an inner ring of relatively soft and flexible material such as rubber. The outer ring releasably holds the nosepiece on the distal end of the chuck or other tool holder. A tool is inserted into the chuck or tool holder through a central aperture in the inner ring. The inner ring engages the sides of the tool to help keep dust and debris out of the chuck or tool holder. The nosepiece can be removed and replaced when it becomes worn (e.g., when the inner ring is no longer functional).

Abstract: A chuck for driving drill bits an the like having shafts of hardened steel is provided with clamping jaws which at least at their clamping surfaces have a coating of diamond dust, so that they will have a resistance to abrasion that is greater than that of hardened steel. The diamond dust can embed itself in the clamping jaws. The entire chuck jaw may be made with a material having that property or one or more clamping parts of the jaw may be made of such a material, or the coating may be provided on a part of the chuck jaw or on the clamping parts.

Abstract: A tool chuck is provided for rotary power tools that includes a dust seal for reducing the quantity of dust and cuttings entering the chuck mechanism. The tool chuck features an endcap affixed to the chuck body and a circular brush may be either permanently or removably engaged to the endcap. The circular brush comprises a multiplicity of either metallic or plastic bristles that contact the shank of a tool bit engaged in the tool chuck.

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 keyless chuck (10; 301) comprises a jaw housing (28; 303) with jaws (32; 333, 335, 337 ) which are slidably mounted in guideways (40; 319, 321, 323) between a rearward opened position and a forward closed position. A jaw thrust member (34; 345) is coupled to the jaws and is slidably mounted in the jaw housing to apply a thrust force to the jaws and to maintain the jaws in the same relative axial location. A nut (42; 355) is fixed to the jaw housing and has a threaded opening (46; 357) coaxial with the chuck axis (A.sub.x). A threaded spindle (48; 305) is engaged in the nut opening and is movable forwardly to apply clamping force to the jaws and rearwardly to remove clamping force. The spindle preferably engages the jaw thrust member through a small area contact patch (72; 401) to limit operating friction.

Abstract: A chuck is provided that has a threaded axial bore so that the chuck may be mounted onto a threaded spindle. The chuck body has an integrally formed socket that accepts a drive bit so that the chuck may be screwed onto the spindle by inserting a drive bit into the socket and rotating the chuck accordingly.

Abstract: A non-slip drill chuck apparatus is provided on a hand drill. The drill chuck has a shell with bevel gear teeth for use with drill motors and the like, a stationary collar which extends from the shell and a plurality of adjustable jaws that extends from the stationary collar. The apparatus consists of a chuck key mechanism for engagement with the collar and the shell for non-inadvertently disengagable tightening the jaws of the drill chuck tighter about a drill bit to prevent slippage of the drill bit, so as not to cause damage to the drill bit and the drill chuck itself.

Abstract: A non-impact keyless chuck suitable for use with manual or powered drivers is disclosed. The chuck comprises a body which carries a rotatable split nut having a relatively fine thread and a plurality of slidable jaws, which may be identical, driven by the rotatable nut. An anti-friction bearing is disposed between the rotatable nut and a bearing thrust ring mounted on the body. A clutch or torque limiting mechanism is provided to limit the tightening torque to a predetermined value while the loosening torque may be limited or unlimited. The front sleeve, and rear sleeve, if used, may be formed from a structural plastic to reduce manufacturing costs. A relatively soft elastomeric grip boot may be placed on the front sleeve to improve the grip and temporarily restrain and center the tool during chuck tightening or loosening operations. A relatively soft elastomeric grip boot may also be placed on the rear sleeve, if used.

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: 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 tool chuck according to this invention comprises a locking device disposed between a chuck body and chuck claws slidable by screw feeding. The locking device presses and locks to the chuck body by a reaction force occurring when the chuck claws clamp a tool. The tool chuck further comprises a torque amplifying device disposed between the locking device and a control ring rotatably mounted on the chuck body. When the locking device is locked to the chuck body, the torque amplifying device reduces rotation of the control ring to output an amplified torque to a screw ring which screw-feeds the chuck claws. The chuck claws are slidable fast until the chuck claws clamp a tool inserted in position to realize a quick clamping action. When the chuck claws contact and hold the tool, the chuck claws are slidable with an increased torque, thereby holding the tool with a strong clamping force.

Abstract: A keyless chuck for a rotary tool comprises a chuck body which is adapted to be coupled at its one end to a drive spindle of a drive source and coupled at the other end to a tool bit for establishing a driving connection from the drive source to the tool bit. Relatively rotatable to the chuck body is a sleeve ring which is operatively connected to a set of gripping jaws for tightening the gripping jaws on the tool bit upon being rotated in one direction and loosening the same upon being rotated in the opposite direction. A one-way clutch is provided to rotatively fix the sleeve ring to the chuck body when the chuck body is driven to rotate in the direction of turning the tool bit reversely.

Abstract: The subject of the invention is an attachment to all drilling apparatus which include one or more chucks.The attachment is made to facilitate and speed up the invention into and removal from drill holding chucks.The attachment compreses a set of two collars for every chuck. The first one of said collars is attached or forms part of the chuck and the second one is fixedly attached or forms part of the body of the respective apparatus. Within a slot in the second collar is movable a driver which can be brought into engagement with a recess in the face of the first collar. When in engagement, the driver causes the chuck to rotate and to open for insertion or to close for removal of a drill.

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: A 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. Angled guides and a screwthread formed on the body, sleeve, and jaws radially displace the jaws toward each other on relative rotation of the sleeve and chuck body in a tightening direction. The sleeve and an axially displaceable locking-ring body have axially interengageable teeth that inhibit angular movement of the ring body and sleeve about the axis only in a front locking position of the ring. A projection is fixed in and extends radially from one of the bodies toward the other body which is formed with an angularly extending slot having angularly opposed and spaced end surfaces spaced apart angularly by a distance greater than the angular dimension of the projection and axially opposed and spaced side surfaces spaced axially by a distance generally equal to the axial dimension of the projection.

Abstract: A chuck for a tool according to the present invention incorporates a clutch mechanism (17) between a rotating member (3) and a rotating nut (4). The clutch mechanism intermittently cuts off the transmission of power from the rotating nut to the rotating member, generating an impact force. This impact force increases the amount of force with which a tool (W) such as a drill is fastened and makes release of the tool smooth.

Abstract: A reversible power drill having a drill chuck tightener is disclosed. The drill has a body and chuck reversibly rotatable with respect to the body. The tightener comprises a lever or a contact post attached to the body of the drill and an impact button attached to the back portion of the chuck of the drill wherein the lever or post impacts the impact button as the chuck rotates, thereby tightening or loosening the chuck depending upon the direction of rotation of the drill. The lever or post is biased by a spring into a position which disengages it from the impact button when not in use.

Abstract: A chuck comprises a body centered on an axis and adapted to be mounted on a drill spindle for rotation about the axis and a tightening sleeve carried on the body and rotatable thereon about the axis. The sleeve or body is formed centered on the axis with an array of angularly equispaced guides inclined to the axis and the other element is formed centered on the axis with a screwthread formation. Respective jaws are displaceable axially and radially of the axis in the guides relative to the axis and are formed with teeth meshing with the screwthread so that rotation of the sleeve relative to the body in one rotational sense moves the jaws axially forward and radially together and opposite rotation moves them axially backward and radially apart. A braking sleeve rotatable on the tightening sleeve has an inner surface engageable with the tightening sleeve and this inner surface can be pressed radially into engagement with the tightening sleeve.

Abstract: To provide for an axially short self-tightening chuck, a spiral spring (22) is located inside the chuck to couple together a cylindrical surface (24) formed on the chuck spindle, for example on an extending flange (17) thereof and a cylindrical surface (25) on an axial extension (16) of a holding sleeve which retains the chucking mechanism, including clamping jaws (9) and the like. An operating ring (23) is engageable with an end portion of the spring. The spring has a direction of winding which, with a given direction of rotation of the tool, tightens the spring about the axially adjacent surfaces (24, 25) on the chuck body and the holding sleeve, so that they will rotate together, and, even under conditions of vibrations or sudden stopping, not loosen, since relative reverse rotation is inhibited by frictional engagement of the spiral spring between the parts.

Abstract: A self-tightening drill chuck has a chuck body adapted to be mounted on a drill spindle for rotation about an axis and formed with substantially cylindrical front and a rear outer surfaces both centered on the axis and axially offset from each other and with an outwardly open groove between the front and rear surfaces. A tightening sleeve surrounding the body is formed with substantially cylindrical front and rear inner surfaces both centered on the axis and riding on the front and rear surfaces of the body and with an inwardly open groove between the front and rear inner surfaces and forming with the groove of the body an annular generally circular-section passage This sleeve also is unitarily formed with a rearwardly flared substantially frustoconical seat also centered on the axis. Rollers riding in the grooves support the sleeve on the body so as to permit relative rotation of the body and sleeve about the axis while preventing relative axial displacement.

Abstract: A keyless chuck includes a jaw housing with jaws that are advanced in respective guideways to grip a tool bit and retracted to loosen the grip on the tool bit. A jaw thrust member is coupled to the jaws and to a threaded spindle and is forced forwardly or rearwardly to advance or retract the jaws. The threaded chuck spindle engages the jaw thrust member through a small-area contact patch to limit the operating friction and thus provide a chuck which can be readily hand-tightened and which self-tightens in response to torque transmitted through the chuck. A lock mechanism is provided to selectively lock a chuck adjusting sleeve relative to the jaw housing to allow uni-directional movement of the chuck adjusting sleeve relative to the jaw housing or selective bi-directional locking of the chuck adjusting sleeve relative to the jaw housing.

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: The invention contemplates an improved drill-bit construction wherein the shank by which the bit is clamped is characterized by (a) three angularly spaced grooves which are continuous over their entire length of engageability to the jaws of a multi-jaw chuck, (b) at least one of the grooves being closed at its rear end, (c) the rear end of the closed-end groove is at no greater offset than 5-mm from the rear end of the bit, and (d) the diameter of the cutting part of the bit shank is greater than the diameter of the clamping part of the shank, to an extent which at most results from shaped formation of the chip-removal groove.

Abstract: A selftightening drill chuck has a chuck body having a chuck thread, a chuck sleeve, a plurality of clamp jaws which are guided slidably in the chuck sleeve inclined to the chuck axis and a locking ring on the chuck body which is rotatable between two rotational end positions and is axially slidable and is coupable in the circumferential direction with the clamping sleeve by two tooth rings. The chuck body has a conical surface extending parallel to the feed direction of the clamp jaws on which the chuck thread is located which engages with a transverse gear on each clamp jaw. A spring acts on the locking ring in a rotational direction which corresponds to the opening of the drill chuck. To limit rotation of the locking ring a stop pin fixed on the chuck body can be provided which engages in a cavity of the locking ring.

Abstract: A clamping chuck for securing a drill bit, chisel bit or the like in a drilling tool includes a guide sleeve into which the bit is inserted. Clamping jaws are radially displaceably mounted in the guide sleeve with a setting sleeve encircling the jaws. By axially displacing the setting sleeve relative to the guide sleeve the jaws can be radially displaced in gripping engagement with the bit. The setting sleeve has radially inwardly facing surfaces in contact with radially outwardly facing surfaces on the jaws. Retaining elements secured in the setting sleeve engage in slots in the jaws for guiding the jaws. The retaining elements can be strip-like elements extending through the slots in the jaws with the elements having a thickness corresponding to the slot width.