Abstract: Chuck for use with manual or powered driver having rotatable shaft, the chuck including a body member and jaws slidably positioned in angled passageways formed in the body. The chuck further includes a nut rotatably mounted relative to the body member and in engagement with threads on the jaws. A generally cylindrical sleeve member is disposed in driving engagement with the nut and overlying the nose section of the body so that when the sleeve member is rotated with respect to the body, the jaws will be moved thereby to grip the shank of a tool. A pawl member is biased to engage the sleeve member and is disposed selectively rotatably with respect to the body member. When the nut is tightened, the pawl member can be disposed to become nonrotatable with respect to the body member and restrains the nut from loosening during vibration of the chuck in use for its intended purpose.

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: An improved tool holding device has at least one tool engaging member for selectively engaging a tool during operation, such as the jaw blades of a chuck device and gripping jaw blades of a collet device. The tool holding device includes an actuating mechanism for causing the tool engaging members to selectively engage upon a tool. The actuating mechanism includes at least two components in frictional engagement. At least a portion of the frictional engaging components is coated with a solid film lubricant.

Abstract: 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. The chuck includes a self-contained anti-friction bearing assembly disposed between the nut and a thrust ring, as well as a generally cylindrical front sleeve member in driving engagement with the nut and overlying a nose section of the body of the chuck so that when the front sleeve member is rotated with respect to the body member, the jaws will be moved thereby. The chuck also includes a rust resistant decorative nosepiece as well as an improved nut retainer member.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft including a primary tightening mechanism utilizing a three-jaw assembly actuated by a nut or tightening ring and a supplemental tightening mechanism. The supplemental tightening mechanism includes a camming portion defining a tightening cam profile. The supplemental tightening mechanism further includes a plurality of lever bars, one end of each of the lever bars forming a cam follower and the other end of each of the lever bars operatively associated with the nut so that when the supplemental tightening mechanism is actuated in a tightening direction, the lever bars will force the nut forward to produce an enhanced tightening force on the tool through the jaws. The supplemental tightening mechanism is configured to allow drive through release.

Abstract: An improved key-less tool chuck is disclosed.

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: A chuck apparatus in which an internally provided nut member (2) is rotated by rotating a sleeve (1) so that claws (3) threadedly engaged with the nut member (2) by the rotation of the nut member (2) are advanced/retracted for narrowing/expanding a diameter defined therewith and pressingly fastening/releasing a tool (4). A rotary member (7) is provided to face the nut member (2). A set of an even number of rolling members are provided in a recess portion (7a) formed in the rotary member (7). The rolling members (5) are provided under the condition that the rolling members (5) are in contact with the nut member (2) and a rolling member receiving portion (6) between a predetermined surface of the nut member (2) and the rolling member receiving portion (6) provided to face the predetermined surface of the nut member (2).

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 three-jaw chuck is provided with a unitary nut rotatably mounted relative to the body and a retaining member located so as to contact a portion of the unitary nut to prevent axial movement of the nut in the forward direction. The nut may include a first portion of a first outside diameter and a second portion extending axially outward from the first portion with an outside diameter less than the first outside diameter. A sleeve retaining snap ring may be provided engaging the sleeve for retaining the sleeve on the body.

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 chuck for releasably holding a tool such as a drill bit has a torque limiting coupling in the mechanism which is rotated manually to close the jaws of the chuck on the tool. When the chuck has been tightened on the tool by a certain amount, the torque limiting coupling releases. Thereafter, continued manual rotation of the component which provides the input to the coupling operates a cam and cam follower mechanism which forces the jaws of the chuck into even tighter engagement with the tool. When the chuck is subsequently loosened to release the tool, the cam and cam follower mechanism automatically resets to ready the chuck for reuse.

Abstract: A drill chuck has a chuck body centered on and rotatable about an axis and formed with a plurality of jaw guides angularly spaced about the axis and all inclined axially forwardly and with an axially directed annular inner bearing track centered on the axis. Respective jaws in the guides are each formed with a row of teeth that can mesh with a screwthread of an adjustment sleeve generally axially fixed on the body and rotatable on the body in a tightening direction to displace the jaws axially forward and radially toward one another and in an opposite loosening direction to displace the jaws axially backward and radially away from one another.

Abstract: 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. The chuck includes a self-contained anti-friction bearing assembly disposed between the nut and a thrust ring, as well as a generally cylindrical front sleeve member in driving engagement with the nut and overlying a nose section of the body of the chuck so that when the front sleeve member is rotated with respect to the body member, the jaws will be moved thereby. The chuck also includes a rust resistant decorative nosepiece as well as an improved nut retainer member.

Abstract: A chuck for use with a manual or powered driver having a rotatable drive shaft including a primary tightening mechanism utilizing a three-jaw assembly actuated by a nut or tightening ring and a supplemental tightening mechanism. The supplemental tightening mechanism includes a camming portion defining a tightening cam profile and a release cam profile. The supplemental tightening mechanism further includes a plurality of lever bars, one end of each of the lever bars forming a cam follower and the other end of each of the lever bars operatively associated with the nut so that when the supplemental tightening mechanism is actuated in a tightening direction, the lever bars will force the nut forward to produce an enhanced tightening force on the tool through the jaws, and when the rear sleeve is rotated in a release direction, the force applied to the nut by the lever bars will be released.

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 chuck has a chuck body and a clamping sleeve as well as tool clamping jaws which are held in oblique guides and which, by rotation of the chuck body, can be displaced relative to the clamping sleeve. It furthermore has a tightening device which has a compression spring, which acts in the direction of rotation, an intermediate ring acted on thereby which is rotatable with respect to the chuck body and the clamping sleeve, an unlockable locking member on the intermediate ring, and an outside, rotatable gripping sleeve having an inner stop for the intermediate ring.

Abstract: A hand drill, in particular a hammer drill has a combination tool holder provided with a first tool receptacle with clamping jaws displaceable relative to a base body and adjustable by a rotatable adjusting ring to different diameters of tool shafts, and a second separate tool receptacle for tools with a groove shaft and provided with means for at least one driving and locking as well as with a central receiving opening for the groove shaft tool, and an arresting device having a blocking slider which is arranged displaceably in the base body and non-rotatably connected with the base body in a circumferential direction, the blocking slider being movable between a first end position in which a radially inwardly directed end of the blocking slider engages in the central receiving opening and is provided with teeth such that when a groove shaft tool is inserted in the receiving opening the teeth in another end position of the blocking slider non-rotatably engage with counter teeth connected with the adjusting rin

Abstract: In this chuck, the body is equipped, in its zone overlapped by the sleeve, with peripheral toothing, whereas the sleeve includes a shaped locking member which, intended to be engaged in the toothing of the body in the tightened position of the chuck, is actuated by a ring mounted so that it can pivot on the front end of the body of the chuck.

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 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 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 an axis, a plurality of jaws radially displaceable on the body and each having a row of teeth, and an adjustment ring rotatable about the axis on the body but axially fixed thereon and formed with a screwthread meshing with the teeth of the jaws so that rotation of the ring on the body in a forward tightening direction displaces the jaws radially toward each other and opposite rotation displaces them radially away from each other. The adjustment ring is formed centered on the axis with an annular row of recesses having flanks and open in a predetermined direction. A holding ring is axially fixed on the body and abutments on the holding ring and body permit the holding ring to rotate on the body about the axis between a pair of angularly offset end positions. A return spring engaged between the holding ring and the body can be loaded to urge the holding ring in the forward direction on the body.

Abstract: A chuck for releasably holding a tool such as a drill bit has a torque limiting coupling in the mechanism which is rotated manually to close the jaws of the chuck on the tool. When the chuck has been tightened on the tool by a certain amount, the torque limiting coupling releases. Thereafter, continued manual rotation of the component which provides the input to the coupling operates a cam and cam follower mechanism which forces the jaws of the chuck into even tighter engagement with the tool. When the chuck is subsequently loosened to release the tool, the cam and cam follower mechanism automatically resets to ready the chuck for reuse.

Abstract: A chuck for use with a manual or power driver having a rotatable drive shaft. The chuck includes a generally cylindrical body member with a nose section and a tail section. The tail section has an axial bore formed therein to mate with the drive shaft of the driver, and the nose section has an axial bore therein and a plurality of annularly disposed passageways formed therethrough and intersecting the axial bore for receipt of a plurality of jaws slidably positioned therein. The chuck further includes a generally cylindrical front sleeve member overlaying the nose section of the body member and rotatable with respect thereto. The front sleeve member includes a threaded nut portion integral therewith and in engagement with the threads on the jaws such that when the front sleeve member is rotated with respect to the body member, the jaws will be advanced or retracted, depending on the direction of rotation.

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 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: Chuck for use with manual or powered driver having rotatable shaft, the chuck including a bearing thrust ring fixed on the body and a self-contained anti-friction bearing assembly disposed adjacent the thrust ring. The chuck further includes a nut rotatably mounted on the bearing assembly in engagement with the threads on the jaws, and a generally cylindrical front sleeve in driving engagement with the nut and overlying the nose section of the body so that when the front sleeve member is rotated with respect to the body, the jaws will be moved thereby.

Abstract: 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. The chuck includes a self-contained anti-friction bearing assembly disposed between the nut and a thrust ring, as well as a generally cylindrical front sleeve member in driving engagement with the nut and overlying a nose section of the body of the chuck so that when the front sleeve member is rotated with respect to the body member, the jaws will be moved thereby. The chuck also includes a rust resistant decorative nosepiece.

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: In construction of a tool chuck in which manual rotation of an outer operation sleeve causes concurrent rotation of an inner screw ring to move clamping jaws in a chuck body following the principle of screw feeding, a solid lubrication coating layer is interposed between the screw ring and the chuck body so as to minimize friction between the two elements during their relative rotation for clamping a tool via the jaws, thereby effectively utilizing input torque from the operation sleeve for clamping operation. The solid lubrication coating layer may be applied either to a washer or directly to the screw ring.

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 drive of a drill chuck having a torque coupling which can be placed on a drive shaft of a motor via a base element on a side opposite of chuck jaws. A torque coupling having meshing ball bearing collars is inserted between the base element and the chuck jaws. A spring-loaded driven end of the torque coupling is connected with the base element and a take-off end of the torque coupling is connected with a jaw housing which guides the chuck jaws, each being fixed against relative rotation. A ring abutment for the spring-loaded driven end is fixed on the base element. A cylindrical sleeve projects from the ring abutment in a direction toward the chuck jaws, which are rotationally movable. The cylindrical sleeve overlaps a fitted cylindrical pipe which is positioned on the jaw housing and encloses the torque coupling.

Abstract: In construction of a keyless tool chuck in which clamping torque is transmitted from a manually rotatable operation sleeve on a chuck body to tool clamping jaws in the chuck body via a power transmission unit including a cycloidal gear arrangement, an elastic impulsion sleeve is inserted between the operation sleeve and the chuck body so that elastic compressive deformation of the impulsion sleeve at forced rotation of the operation sleeve causes impulsive meshing engagement in the cycloidal gear arrangement to provide impulsive clamping force on a tool clamped by the jaws. Resultant clamping force is at least twice as large as that provided by a conventional cycloidal gear arrangement only.

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: The chuck assembly is to be incorporated in a drilling apparatus and includes a chuck body which defines an axial through bore to receive a drill bit therein. A pawl and ratchet mechanism is operated to move an enclosed clamp member which is rotatably provided in an annular recess that is formed on an external surface of the chuck body.

Abstract: A chuck includes a body mounted on the motor shaft of a machine. A plurality of jaws is mounted to slide in bores and converge forward. A sleeve surrounds the body and is mounted to pivot around the latter. The jaws have an outer threaded part which meshes with a nut surrounding the jaws and integral with the sleeve surrounding the body. A series of balls is interposed between the face of the nut which faces rearward and the body of the chuck. The balls abut a ring made of a hard material, and that ring in turn abuts a ring made of synthetic material which exhibits shock-absorbent characteristics and is locked against the body.

Abstract: A chuck for a tool is provided, which firmly fastens the working tool and can maintain the fastened state of the tool even when added vibration to be caused during operation. A plurality of jaws are obliquely provided relative to the axis of a chuck body, a grip sleeve is provided close to the rear end portion of the chuck body in unmovably fitted condition relative to the chuck body, a male screw portion is formed on the outer peripheral surface of each jaw, a nut sleeve is rotatably mounted to the chuck body, a female screw portion is provided on the inner peripheral surface of the nut sleeve, a rotational sleeve is provided in axially slidable condition to the chuck body but unrotatably engaged to the said nut sleeve, and the male screw portion and the female screw portion are engaged with each other, and whereby when said rotational sleeve is rotated by hand, the jaws are advanced/retracted to thereby clamp/release the tool.

Abstract: A chuck for use in a percussion drill or the like has a unit for securing the chuck jaws against unintentional loosening during operation. The securing unit moves from an unlocked position in which a tool can be received by the chuck jaws to a locked position automatically for drilling operations without the use of a key. The securing unit includes a first surface (22) upon which a sliding member (21) is slidable to be received in a recess (26) during the shaking caused by drilling, so that coupling members (15, 19) between a securing sleeve (17) and a clamping sleeve (13) engage with one another.

Abstract: A tool chuck has a plurality of inclined chuck claws mounted centrally of a forward end of a chuck body to be slidable toward and away from one another, a nut ring meshed with the chuck claws and rotatable to screw-feed the chuck claws toward and away from one another, and a torque amplifying mechanism interposed between the nut ring and a control ring fitted to an outer peripheral surface of the chuck body, whereby the control ring is turned directly by hand to cause the chuck claws to hold a tool. A torque limiter is incorporated into the torque amplifying mechanism for allowing the tool to be clamped by a force not exceeding a predetermined value. Excessive tightening of the tool is thereby avoided so that the tool is removable when desired, and at the same time the above torque limiter is formed compact.

Abstract: A self-tightening drill chuck adapted to be mounted on a drill spindle for rotation about and reciprocation along the axis of the spindle has a guide body rotatable on the spindle about the axis and formed with a plurality of jaw guides inclined relative to the axis and spaced angularly thereabout and formations axially fixing the guide body on the spindle against substantial relative axial displacement. Respective jaws displaceable in the guides are formed with radially directed teeth meshing with a screwthread of an adjustment body fixed on the spindle against rotation thereon so that rotation of the adjustment body relative to the guide body in one direction displaces the jaws radially toward one another and opposite rotation displaces the jaws radially apart. Further formations secure the adjustment body on the spindle for limited relative axial displacement substantially greater than the relative axial displacement possible between the guide body and the spindle.

Abstract: A tool chuck suitable for use with manual or powered impact drivers is described. The chuck comprises a body which carries a rotatable nut and a plurality of slidable jaws, driven by the rotatable nut. An anti-friction bearing is disposed between the rotatable nut and a bearing thrust ring mounted on the body. The bearing thrust ring has a plurality of detents and may cooperate with a compression spring to prevent the chuck from loosening during operation.

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 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 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: The profiles of the threads on the jaws of a chuck, such as a three-jawed chuck, are modified so that at least one end of the jaw thread segments curve in away from the threads on the nut which operate the jaws. This prevents the end edges of the jaw thread segments from digging into the nut threads when the nut is rotated to operate the jaws.

Abstract: A chuck for tools comprises a main body in which an axial center hole and a plurality of slanting holes extending radially from the center hole are formed, a plurality of jaws each being slidably inserted in each slanting hole and formed, at its outer surface, with a male screw, a rotary member having a female screw in meshing engagement with the male screws and mounted in the main body so as to be permitted for only rotation, a first grip integrally connected to the main body, and a second grip securely connected to the rotary member to cooperate therewith.

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: An axially movable sleeve has interference members or lugs engageable with interference members or lugs associated with the split nut in a chuck. When the chuck is driven by the spindle, the axially movable interference members engage the split nut interference members and are restrained from rotation. The nut is also restrained and the chuck jaws open or close depending upon the direction of rotation of the chuck body. The sleeve is positioned to be engaged by the jaws as they approach full open position. The jaws then move the sleeve axially to disengage the interference members and stop further opening of the jaws before they reach a position to wedge or jam in the open position.

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.