Abstract: To provide a chuck assembly which is superior in practical usability and workability in clamping and fixing a tool to a spindle without fail and with ease by lever-operation of a specialized operational jig, a taper portion is provided on at least one of an inner circumferential wall of the sleeve portion and an outer circumferential wall of the tool clamping portion, the tool clamping portion and the sleeve portion are brought into contact with each other at the taper portion, a retainer portion for retaining the operational jig is provided on the sleeve portion, a support portion is provided in a predetermined position of the chuck assembly body for supporting the operational jig retained at the retainer portion, the sleeve portion retained by the operational jig is slidingly moved relative to the tool clamping portion when the operational jig is lever-operated in a taper direction of the taper portion by using the support portion as a fulcrum, and the opening portion of the tool clamping portion is widened

Abstract: A collet chuck assembly includes an annular mount adapted to be attached to a spindle of a turning machine, a tubular collet sleeve disposed internally to the mount including an inner tapered cam surface and adapted to be coupled to an axial moving mechanism of the turning machine, and a tubular collet structure dispose interiorly of the collet sleeve and having a cooperating tapered, outer cam surface. An annular retaining cap has retaining lugs adapted to be engaged with locking flanges of the mount upon engagement of the cap with the mount and rotation of the cap with respect to the mount. The installed cap engages a front end of the collet structure to retain the collet structure within the collet sleeve. A cap anti-rotation mechanism includes an anti-rotation pin carried within the mount for reciprocating axial movement with respect to the mount between extended and retracted positions and a pin actuating mechanism for selectively effecting the reciprocating axial movement.

Abstract: A router includes a tool holder which has a spindle with a bore to receive a router tool bit. A sleeve surrounds the spindle. A locking mechanism retains the router bit in the bore. The locking mechanism includes at least one rolling member in contact with the sleeve and which extends into the bore. The rolling member locks the router bit in the tool holder. A biasing member retains the sleeve in a locked position. The locking mechanism includes an activation member remotely positioned from the sleeve for moving the sleeve between the locked and unlocked position.

Abstract: A drill or milling head (1), especially for printed circuit milling machines and engraving machines, including a collet chuck (27) which can be actuated by a rapid change mechanism. The drill or milling head includes a drive shaft which can be connected to a motor (3a). The collet chuck (27) is opened by axial displacement opposite a clamping sleeve (29), and the force necessary for the axial displacement is transmitted via a friction clutch (19, 23). As a result the drill or milling head cannot be damaged, and there is no danger of injury when changing the tool if the user fails to turn the motor (3a) off beforehand.

Abstract: A rotary power tool is provided having a remotely actuated chuck device. The chuck is mounted onto the end of a drive spindle that extends from the casing of the power tool. The chuck includes an outer sleeve member that is axially movable relative to the drive spindle between a gripping and release position. A chuck actuating device is provided having a first member engaged with the outer sleeve member and which extends generally radially outward from the drive spindle or chuck. The first member is movable in a direction so as to move the outer sleeve member between the gripping position and release position. A solenoid and a biasing mechanism engage the first member so that the chuck device is movable between the gripping and release positions.

Abstract: A hydromechanical chuck intended to be mounted, with one end thereof, in a machine, such as a drilling machine, milling machine, lathe machine etc. and, with the opposite end thereof to releasably hold a shaft tool like a drill, a milling tool, a rotary saw blade, or a rotary grinding roll. The hydromechanical chuck is formed as a cone coupling chuck comprising a inner sleeve which can change is radial dimensions and has a central bore for receiving the shaft of a shaft tool. The inner sleeve is adapted for being radially compressed against the tool shaft. The hydromechanical chuck has a solid outer sleeve which is axially displaceable on the inner sleeve. The inner sleeve and outer sleeve are formed with a matching cone surface, which, upon a displacement of the outer sleeve on the inner sleeve, provides a radial compression of the inner sleeve.

Abstract: A resecting tool contains a rotatable chuck inside a base for engaging the drive shaft of a motor. The chuck extends into a tubular casing that has an outer actuator sleeve. The sleeve is limited to rotation relative to the casing and is used to move a pair of locking elements or balls in separate helical slots in the casing. Each ball is seated in a collar that abuts a collet receiver inside the casing. During implement changeover, the collar abuts the collet receiver and acts as a brake to prevent accidental actuation of the chuck of the tool. The collet receiver is spring-biased into contact with a first collet which closely receives a tool implement within the resecting tool. The sleeve is used to manipulate the collet to clamp onto and unclamp the tool implement. A collet coupling is located on the front end of the casing and has a collet nut on its forward end. The collet nut houses a second collet with a serpentine cut for engaging and retaining a guide sleeve for supporting the tool implement.

Abstract: A device for clamping a knife of a machine center includes a kick member extends through a clamping member which is received in a sleeve. A knife is clamped by pawls extending from the clamping member and the sleeve has an annular flange to hold the pawls. Two bolts connected between the sleeve and the kick member via slots defined in the clamping member. The kick member is pushed by a pushing device which has a pressing member to push the kick member to disengage the annular flange from the pawls so that the knife is not securely held by the pawls and a knife switching arm can easily remove the knife from the pawls.

Abstract: An Improved Collet Assembly and Manufacturing Process is disclosed. Also disclosed is an improved collet that includes a spindle, a center portion comprising several tabs and a collar. The disclosed collet is manufactured from a single piece of stock, and as such, the tabs are formed from this unitary piece. The disclosed collet is inserted into a collet housing that is further defined by a bore at its center. The preferred collet housing bore is further defined by a sloped portion that cooperates with the tabs formed on the collet to restrain a burr shaft from rotational or axial movement. The collet assembly of the present invention provides improved balance and therefore wear properties over previous collet assemblies. In particular, the disclosed collet assembly is well-suited for application inside a canister assembly of an air-powered dental tool handpiece.

Abstract: A rotary power tool incorporates a remotely actuated chuck device. An engagement surface, such as a threaded or helical surface, is defined on an outer circumference of the chuck device over an axial length thereof. An actuator member is disposed concentric and rotatable relative to the engagement surface. In an actuation mode, the actuation member is brought into engagement with the engagement surface so that rotation of the actuator member drives the chuck device axially between gripping and release positions.

Abstract: A rotary power tool is provided having a remotely actuated chuck device. The chuck includes an outer sleeve member that is axially movable relative to the drive spindle between a gripping and release position. A sleeve actuating device is provided having a first member engaged with the outer sleeve member and which extends generally radially outward from the drive spindle or chuck. The first member is movable in a direction so as to move the outer sleeve member between the gripping position and release position. The sleeve actuating device includes an actuator member configured with the first member to move the first member upon an external force being applied thereto. The actuator member is generally perpendicular to the axis of the drive spindle and may be limited in length to be confined in the perimeter of the casing. In this manner, an operator can move the chuck device between the gripping release positions at a location remote from the chuck device and drive spindle.

Abstract: A rotary power tool has a remotely actuated chuck device. A hydraulic actuating system is incorporated in the power tool and is configured to move the chuck device between the gripping and release positions upon hydraulic fluid being supplied to at least one hydraulically driven actuator mounted relative to the tool casing and engaged with the chuck device to move the chuck between gripping and release positions.

Abstract: A rotary power tool is provided having a remotely actuated chuck device. The chuck is mounted onto the end of a drive spindle that extends from the casing of the power tool. The chuck includes an outer sleeve member that is axially movable relative to a drive spindle between a gripping and release position. A sleeve actuating device is provided having a first member engaged with the outer sleeve member and which extends generally radially outward from the drive spindle or chuck. The first member is movable in a direction so as to move the outer sleeve member between the gripping position and release position. The sleeve actuating device includes an actuator member configured with the first member to move the first member upon an external force being applied thereto. A base is rotatably advanceable and concentric on the casing. A helical opening is formed in the base.

Abstract: A rotary power tool, such as a router, includes an actuating device engaged with a chuck device to move the chuck device between its gripping and release positions. The actuating device includes a lever member that extends axially relative to a casing of the power tool within an inner circumference of a base member. This lever member is movable relative to the casing and is engaged with the chuck so that movement of the lever is imparted to the chuck device causing the chuck device to move axially between its gripping and release positions.

Abstract: A collet is provided to grip a workpiece with a uniformly distributed gripping force. The collet includes a plurlity of circumferentally spaced-apart radial slots extending partly through the collet and at least one opening extending radially all the way through the collet and lying between the end surfaces of the collet. Shim slots are formed in the end surfaces and a shim is mounted in the two shim slots to extend across the opening to block debris from moving therethrough. Coil springs are provided to bias a pair of collet segments to engage an actuator member of a machine-tool chuck. Methods of making the collet are also disclosed.

Abstract: A tool holding device for holding a tool bit to a drive spindle includes a body member having an axially extending bore defined therein for receipt of a tool shank. The body member includes a plurality of axially extending segments defining the bore. The segments are defined by axially extending slits in the body member. The slits extend from a front face of the body member rearward. The segments are radially compressible to grip upon a tool shank inserted into the bore when a radially compressive force is applied to the segments in the area of the slits. The bore defined by the segments has a tapered diameter that is greater at the front face of the body member and tapers to a lesser diameter in the axially rearward direction.

Abstract: A rotary power tool is provided having a remotely actuated chuck device. The chuck is mounted onto the end of a drive spindle that extends from the casing of the power tool. The chuck includes an outer sleeve member that is axially movable relative to the drive spindle between a gripping position and a release position. A sleeve actuating device is provided having a first member engaged with the outer sleeve member and which extends generally radially outward from the drive spindle or chuck. The first member is movable in a direction so as to move the outer sleeve member between the gripping position and the release position. The sleeve actuating device includes an actuator member configured with the first member to move the first member upon an external force being applied thereto. In this manner, an operator can move the chuck device between the gripping and release positions at a location remote from the chuck device and drive spindle.

Abstract: The present invention is a collet assembly with a sliding lock. The assembly includes a segmented tubular body with the segments being increasing in size from one end of the body to the other. The two smallest segments form a plug for securing the collet assembly to a first object. The two larger segments form a collet which receives a second object. The collet has a tapered cross-sectional area, with the area decreasing from the end of the collet assembly towards the middle of the collet assembly. The collet includes longitudinal slots that extend from the end towards the middle of the collet assembly. The collet may include a sleeve in its bore. Like the collet, the sleeve has a plurality of longitudinal slots. The collet assembly also includes a slidable tubular collet lock having a passageway for receiving said collet therethrough.

Abstract: A support rod (3) vertically movably inserted into a housing (2) is urged upward by an advancing spring (4). An annular piston (6) is inserted between a barrel portion (2c) of the housing (2) and an outer peripheral surface of the support rod (3). A collet (10) externally fitted onto a holding and fixing portion (C) of the support rod (3) is received by a lower end wall (2b) of the housing (2). A tapered transmission member (17) externally fitted onto the collet (10) is urged downward by a holding spring (22). The urging force clamps the support rod (3) at a predetermined height through the collet (10).

Abstract: A collet chuck assembly includes a chuck body carrying a collet retaining ring for receiving the threaded rear end of a standard collet. The collet retaining ring is secured to the chuck body and held against both axial and radial movement relative to the chuck body by a plurality of radially extending fasteners having inner, tapered portions received by correspondingly tapered holes in the retaining ring. A longitudinally or axially displaceable closing sleeve compresses the collet jaws when the sleeve is moved inone axial direction and releases the jaws when moved in the other axial direction. Axial displacement of the closing sleeve is effected by a collet actuator including a plurality of longitudinal fingers extending through openings in the collet retaining ring and having end portions configured to interlock with a correspondingly configured mating portion of the collet closing sleeve.

Abstract: The chuck includes a slitted body with an axial bore that holds the tool shank during rotation of the chuck. A gripping sleeve applies compressive pressure via cam elements to reduce the diameter of the axial bore. A spring biased locking sleeve can activate locking elements to lock the gripping sleeve to the body member in the locked position.An engagement mechanism connects the chuck to a drive spindle and also has a mounting mechanism for facilitating automated mounting of the chuck to a drive spindle.

Abstract: A collet system for mounting, holding, and rotating a rigid disk is described, the collet system including a collet and an expander, the collet having a base portion and fingers longitudinally extending therefrom, the fingers forming a disk contact ring opposite the base. The disk contact ring is less than the thickness of the disk to allow for full surface texturization of the disk. The disk contact ring is not coplanar with any locus of expansion contact points between the collet fingers and the expander, and is sufficiently distant therefrom such that the outward force exerted on the inner disk surface is determined by a cantilever spring deflection experienced by the fingers. This ensures substantially uniform and repeatable outward forces on the inner surface of the disk regardless of minor surface variations along the locus of expansion contact points.

Abstract: A collet-operating mechanism utilizes an array of wedge members for the transmission of closing force to the pressure collar. The wedge members are of flatted barrel-shaped configuration to optimally cooperate, in line contact relationships, with bearing surfaces on the pressure collar and the supporting sleeve member.

Abstract: A ratchet wrench (10) includes a unitary socket assembly (20) having a collet (26) and an adjustable fastener engaging socket (24) which may be positioned over a conventional fastener and which may then be decreased in diameter to effect a gripping attachment of a fastener. The socket assembly (20) includes a stud (28) that is releasably engageable with the ratchet wrench (10). A locking lever (80, 80A) is attached to the ratchet wrench (10) and is usable both to decrease the diameter of the socket (24) and to releasably lock the socket in attachment with the fastener. The locking lever (80, 80A) may employ ratchet and pawl members (400, 402). If desired, the ratchet wrench (10) may instead be pneumatically activatable. Further, the wrench (10) also includes a camming means for reducing the diameter of the adjustable fastener engaging socket (24) formed on the inside of the leading edge of the collet (26), and on the outside edge of the socket.

Abstract: An object of the present invention is to provide a collet chuck in which a chuck section of a collet is so formed as to provide a greater chucking force when the collet chuck is turned. To accomplish this object, a collet chuck is provided in which a collet mounted on the axis of rotation of a rotating element which rotates in one direction, and having a chuck section which is guided for closing by a guide section of a retainer which is interposed between the rotating element and the collet and moves on the axis of rotation, is adapted to hold a member to be chucked by inserting into an insertion hole of the collet, and the chuck section of the collet is formed in a spiral configuration having a plurality of slits cut from one end of the retainer side and in the opposite direction of rotation along the direction of the axis of rotation.

Abstract: A collet system for mounting, holding, and rotating a rigid disk substrate is described, the collet system including a collet and an expander, the collet having a base portion and fingers longitudinally extending therefrom. The inner surface of the disk is clamped by the radially expanding fingers at a location which is not coplanar with any locus of expansion contact points between the collet fingers and the expander. The outward radial force exerted on the inner disk surface is thereby determined by a cantilever spring tension experienced by the fingers, thus producing a highly consistent, repeatable force which is robust against small frictional variations in the environment and against small variations in inner diameters among disks. Inward axial movement of the expander into the collet is abuttably stopped at a predetermined offset for increased robustness, tolerance, and repeatability of results.

Abstract: A collet closer assembly for a machine tool has a body adapted to be attached to a spindle of a machine tool. A pair of bores extend into the body from opposite ends thereof. A collet is received into the bore at the distal end of the body and is immovably attached to the body. A closing sleeve extends from the distal end of the body and encircles the collet. A collet housing is attached to the distal end of the body to enclose the collet sleeve. A slide member is positioned in the bore at the proximal end of the body, and the slide member is adapted to be attached to the end of a draw bar of the machine tool. A mechanical linkage connects the slide member and the collet sleeve so that the collet sleeve moves in concert and in conjunction with the slide member and the draw bar. The collet sleeve closes and opens the collet as the collet sleeve moves forward and backward, respectively.

Abstract: A collet arrangement comprises a collet having a taper at its work-piece receiving segmented head. The collet is axially fixed relative to a chuck body by means of a screwed bush. The latter is locked axially to the chuck body by being trapped under the heads of bolts, and is locked against rotation by means of a pin. The chuck body is secured to the machine spindle. A tapered sleeve is slidable between the chuck body and the collet and is secured to a draw tube by bolts, an actuating plate and an adaptor ring. These bolts freely slide through the chuck body and can thus move the tapered sleeve in an axial direction relative to the collet so that their respective tapers cause the collet segments to grip and release the work piece. Unlike the normal draw back type of collet arrangement, the collet itself is therefore axially fixed.

Abstract: A collet chuck holder is described in which a standard collet is threaded into a retaining ring which is firmly fastened to the inside of a chuck body. A push tube inside the chuck is joined by bolts to a closing sleeve which surrounds the collet; these bolts pass through oversize holes in the collet retaining ring so that forces exerted by the push tube affect only the closing ring and are not transferred to the collet retaining ring. Unlike the draw bar action normally applied to collet operation, there is no axial displacement of the workpiece. This feature is useful where axial displacement would cause errors in the machining operation.

Abstract: A handpiece for use in small-scale surgery and microsurgery, for example, oral surgery or surgery in the ear, nose and throat area includes a handpiece sleeve and a collet chuck which is rotatable about an axis and is arranged in the handpiece sleeve. The collet chuck is spring-biased and can be released by an actuating member. The collet chuck serves to hold a tool and is composed of two tubular members which are movable relative to each other along the axis of rotation of the collet chuck. A chucking lever for releasing the collet chuck is pivotable about a lever axis which is directed essentially in normal direction relative to the collet chuck axis. The actuating member includes a drive member which is movable in axial direction together with the two tubular members of the collet chuck, but does not rotate together with the tubular members. The drive member projects with a portion thereof in direction of the collet chuck axis into an undercut portion of the chucking lever.

Abstract: An adapter for converting a standard machine vise into a set-up orthogonal collet fixture including front and back members that bolt to the vise jaws after the vise jaw plates have been removed, an internally tapered sleeve in the back member for engaging a taper on a standard 5C Collet, a take-up nut seated in the same member for engaging threads on the end of the collet to hold the collet, and a cam for moving the sleeve relative to the collet as the vise is closed causing the front member to move toward the back member pulling or pushing the sleeve over the collet thereby causing the collet to clamp the workpiece.

Abstract: A bushingless workhead comprises a flexible drill collet inside a flexible chucking collet. The chucking collet has external frusto-conical surfaces on the ends thereof that mate with corresponding frusto-conical surfaces on a pair of pistons. The pistons are slidable within a housing away from each other to apply opposed forces to the chucking collet. The forces cause the chucking collet to collapse and to also collapse the drill collet to grip a tool inside the drill collet. One piston applies a greater force on the chucking collet than the other piston. The chucking collet is thus forced to move longitudinally in one direction, and it abuts a fixed reference surface that repeatably locates the chucking collet with each tool gripping operation prior to the chucking collet collapsing to grip the tool.

Abstract: An improved plumbers' tool of the type employing a helically wound coiled spring which is controllably inserted into waste lines to remove blockages. In operating the tool of the invention, a storage drum from which the clean-out spring is payed out is rotated, usually by a small electric motor, and the spring is clamped in a chucking mechanism so as to rotate with the housing. The improvement of the present tool resides in the provision of a unique actuating mechanism which provides a substantial mechanical advantage that enables the operator, using only one hand to grip a forwardly positioned stationary handle with the fingers and move a pivotally movable, rearwardly positioned handle with the heel of the hand to cause the chucking mechanism to positively engage the coiled spring in a manner to prevent slippage even under severe torque loading conditions.

Abstract: Valve grinder comprising a grinding wheel mounted on a bench, said bench also having a surface for supporting a valve stem support stand mounted a spaced distance from said grinding wheel, said valve stem support stand comprising a pair of V-blocks and valve bearings for engaging the valve stem and an end stop. Mounted on said surface by a tandem axis pivot is a chuck for gripping the valve stem, said chuck including a positive clamping collet that engages the valve stem annularly with a plurality of contact points when the collet is squeezed between a collet spool and collet cover by a collet fork. Said chuck further rotates the valve while maintaining the positive clamping on the valve stem during the grinding operation but independently of the valve support stand.

Abstract: An apparatus for holding a disk with a central hole has a front rod which is received in a chuck so as to be able to move along its axis. The chuck is slidably received between the inner surface of a cylinder and the outer surface of the front rod. The front rod has on its front end an inverted truncated cone of which the maximum outer diameter is smaller than the diameter of the opening in the disk. When a part of the chuck is protruding from the cylinder, the disk can move past a bulge formed on the chuck and positioned on an expander. When the front rod is retracted into the cylinder, the inverted truncated cone moves inside the front end of the chuck so as to spread the chuck until it touches the inner surface of the opening of the disk, and the chuck is retracted along with the front rod so that the disk is firmly grasped and held between the front end of the cylinder and the bulge.

Abstract: A collet-operating mechanism utilizes an array of wedge members for the transmission of closing force to the pressure collar. The wedge members are uniquely configured to optimally cooperate with a convexly arcuate bearing surface on the supporting sleeve member, to effect closure with greater facility and to produce an increased level of force amplification. In addition, the wedge members are of such form as to make feasible manufacture by conventional machining operations.

Abstract: A collet clamping mechanism having a sleeve with shoulders thereon, and an actuator for forcing against the shoulders for clamping a workpiece in the collet.

Abstract: A ratchet wrench includes an expandible fastener engaging socket which may be positioned over a conventional fastener and which may then be decreased in diameter to effect a gripping attachment. A locking lever is attached to the ratchet wrench and is usable to both decrease the diameter of the expandable socket and to lock the socket in attachment with the fastener. The lever operates in the manner of a conventional lockable plier so as to provide the ratchet socket wrench with a plier-like function.

Abstract: A collet for gripping an associated cylindrical workpiece comprises a pair of actuating rings and a plurality of slide blocks. The slide blocks are held within a housing and feature a pair of opposed slots within each slide block. The slots are oriented at a 45.degree. angle to a radial centerline of the slide blocks. Each one of the slots slidably receives one of the actuating rings therein. Axial movement by an actuating ring causes radial movement of the slide block inwardly toward the workpiece to grip it, or outwardly away from the workpiece to release it.

Abstract: An apparatus for cutting and shaping a material is disclosed which includes securing means for securing an adaptor having a lens blank or a semi finished lens is fixed thereto to apparatus for working. The securing means comprises a generally cylindrical housing having first and second ends and a throughbore, the first end having a plurality of axial slots defining a plurality of finger-like members which can act as a collet. A piston is disposed within the throughbore and is axially movable therein, the piston being connected to a sleeve member which is mounted so that it surrounds the plurality of finger-like members. The securing means further comprises means for moving the piston relative to the housing and means for defining a sealed fluid chamber between the piston and the piston moving means.

Abstract: A collet clamp and releasing yoke apparatus having a support block and a cylindrical sleeve for receiving a collet. The collet is axially fixed, and the sleeve moves for contracting the collet to clamp a workpiece therein, and a yoke is employed for the clamping and releasing movement of the sleeve. A plurality of these assemblies can be positioned within the block so that a plurality of workpieces can be retained and worked upon.

Abstract: An improved spindle assembly for a single or a multiple spindle machine is disclosed. An outer tubular member is mounted for rotation by the spindle machine. An inner shaft is positioned within the tubular member and a collet is movable between a locked and an unlocked position. A workpiece can be removed from the unlocked collet by high pressure liquid from the inner shaft. In one embodiment the inner shaft is rotated independently from the tubular member and is also axially reciprocable. A tool mounted on the inner shaft provides for interior machining at the same time as an exterior operation is being performed. In another embodiment the collet remains axially stationary.

Abstract: A clamping device for locking the workpiece-carrying collet of an automatic machine tool has a spring made of flexible plastic material. The spring has a flat elasticity characteristic and cooperates with an adjusting nut and an indicator nut. Pivotable closing levers that cooperate with a profiled abutment sleeve are also provided.

Abstract: A tool clamping device comprises an axial sleeve having a forwardly tapering internal surface. A radially compressible ring is disposed on the internal surface. An axially compressible spring opposes axial movement of the ring while permitting axial rearward movement of the sleeve whereby the tapering surface of the sleeve compresses the ring radially inwardly into coupling engagement with a groove formed in a tool holder.

Abstract: A sewer augering apparatus and more particularly a sewer augering apparatus having a power feed and manual lock apparatus with actuation thereof by an, axially slideable actuator.

Abstract: In an automatic screw machine two spindles are mounted coaxially one within the other and are keyed together for rotation in unison in the indexing head of the machine. The inner spindle has a collet on one end thereof; the outer spindle is shiftable axially relative to the inner spindle between collet opening and closing positions. A spring, which surrounds the inner spindle at one end thereof, urges a washer on the inner spindle against one end of the outer spindle normally to urge the outer spindle resiliently into a collet closing position. A hydraulic cylinder, which surrounds the outer spindle at the side of washer remote from the spring, contains a piston which is engaged at one side with the washer and at its opposite side communicates with a fluid pressure chamber. To open the collet pressure is applied to the fluid in the chamber, thereby causing the piston to compress the spring and to permit the outer spindle to move to a collet opening position.

Abstract: A collet-operating mechanism employs a plurality of locking pins which, under centrifugal forces generated during rotation of a machine spindle, engage an element of a slidably mounted collet-operating member to maintain the collet in closed condition.

Abstract: A collet type work driver for holding and driving a workpiece which is located between work centers upon a grinder, lathe or similar machinery, is disclosed. The work driver includes a unique free-floating collet package which rotates essentially free from contact with the remaining components of the work driver. Radial positioning forces are thus eliminated and existing workpiece eccentricities are automatically accommodated. The work driver can be rapidly loaded and unloaded and can have a significant effect upon production rates. The collet package portion is loosely retained within the work driver during idle periods and will not be lost or damaged. Uniform gripping action by means of the work driver eliminates workpiece deflection and surface marking and enables the device to be used with very fragile and brittle workpieces.

Abstract: The invention concerns a collet adaptable to a machine-tool that includes a chuck for clasping a workpiece to be machined, the chuck comprising a front face, at least two clasping jaws moveably affixed to jaw position adjustment means and a control device for the said position adjustment means.The collet is comprised of a frame capable of being affixed to the chuck; a main sliding element that is slidably mounted on the frame; the collet per se affixed to the frame and fitted with several stems, the latter each comprising a frustoconical face for controlling the radial displacement of the stems, cooperating with a frustoconical face of the main sliding element; and slides slidably mounted in the frame and cooperating with the main sliding element, and capable of being joined to adjustment devices controlling the position of the holding jaw bits.One application is to provide the simple adaptation of a special collet on an existing machine-tool.

Abstract: A socket, which receives a tool having a cylindrical shaft and which is mounted for rotation to rotate the tool, has an outer sleeve which receives a clamping sleeve and a ram for engaging a first end of the clamping sleeve. The first end of the clamping sleeve is provided with slots defining resilient tongues which are moved from a clamping position radially outward to a position for releasing the shaft by engagement with the ram. The ram has either an outer conically tapered surface or partially conically outer tapered surfaces on projections which engage inner tapered surfaces of each of the tongues or fingers. Preferably, the tapers of the ram and fingers are selected so that only substantially a line contact is formed therebetween to reduce the force necessary to move the fingers or tongues radially outward to the declamping or disengaging position.