Abstract: A worm reducer includes a worm shaft; a worm wheel; a housing that houses the worm shaft and the worm wheel; a bearing that holds the worm shaft inside the housing; a coil spring that contacts an outer peripheral surface of the bearing and applies an urging force toward the worm wheel; and a preload member that is screwed into and fixed to the housing and pressurizes the coil spring. A winding direction of the coil spring is different from a winding direction of a thread of the preload member, and contact resistance between the coil spring and the preload member is greater than contact resistance between the coil spring and the bearing.

Abstract: A line attaching apparatus, system and method for attaching to a line end without the need for tying a knot. The invention further comprises a line attaching apparatus, system and method for attaching to a first line end portion to a second line end portion without the need for tying a knot. The line end portions may be captured in a collet having a line retention and a line insertion/removal state. The collet may be biased into a line retention state by a biasing force that causes the collet to close around a line, preventing the line from translating within the collet. The line insertion/removal state may be achieved by motivation of a plunger against the biasing force, allowing the collet to open so that a line moves freely within the collet opening. An exemplary, non-limiting use is the attachment of a lure or hook to a fishing line.

Abstract: A clamp arrangement for securing an accessory to an oscillating power tool can include a clamp assembly including a first clamp member that moves relative to the accessory between a closed position wherein the clamp assembly retains the accessory and an open position wherein the first clamp is offset from the accessory permitting removal of the first accessory from the clamp assembly. The clamp assembly can further comprise a second clamp member having a first portion that opposes the first clamp member and cooperates with the first clamp member to clamp the accessory between the first and second clamp members. An attachment plate can carry the clamp assembly. The attachment plate can have a first mating detail formed thereon that is configured to selectively and removably mate with a complementary second mating detail on the power tool in an assembled position.

Abstract: A clamping device includes a first clamping segment which has a first mounting flange and a tubular member extending axially away therefrom. A first bore extends through the first mounting flange and the tubular member. The first mounting flange is configured for attachment to a rotatable spindle of a machine tool. The clamping device includes a draw bar assembly which has an axially extending elongate shaft. The elongate shaft extends through the first bore of the first clamping segment. A biasing unit is mounted on or in the tubular member. A locking member is removably secured to the elongate shaft such that the biasing unit is compressed between the locking member and a portion of the first clamping segment. The biasing member remains compressed when the first clamping segment is separated from the spindle of the machine tool.

Abstract: A vacuum adjustment device having a coupling for coupling an active element and a drive unit is disclosed. The drive unit adjusts the coupling from a normal position into an active position, in which the active element provides its intended effect. A separating device separates the process atmosphere region (P) from an outer atmosphere region (A), wherein the drive unit is at least partially associated with the outer atmosphere region (A). The coupling has a locking element cooperating with a collet which are arranged for a relative position variation axially along or parallel to a receiving axis that the locking element is adjustable relative to the collet into an open position and into a closed position. The coupling provides an open changing state in the open position by the interaction of the collet with the locking element and a closed working state in the closed position.

Abstract: Disclosed herein is a rotary changer including a rotator rotatable on a rotational axis extending vertically. An interlocking member is arranged to rotate integrally with the rotator and be movable in a direction intersecting with the rotational axis. The interlocking member has an interlocking groove interlockable with an outer peripheral surface of a nozzle inserted into the hollow of the rotator. Rotating the rotator with the interlocking member interlocked with the nozzle makes the nozzle replaceable.

Abstract: Provided is a chuck structure, which is configured to chuck an annular workpiece from a radially outer side of the workpiece. The chuck structure includes: leaf spring members arranged at a predetermined pitch along a circumferential direction of the chuck structure so as to be symmetrical with respect to a mechanism center axis; chuck claw members mounted to distal ends of the leaf spring members, respectively; and a pressing force applying mechanism configured to apply a force of pressing the leaf spring members radially inward, to thereby elastically press the chuck claw members onto a radially outer surface of the workpiece.

Abstract: A clamp arrangement for securing an accessory to an oscillating power tool can include a clamp assembly including a first clamp member that moves relative to the accessory between a closed position wherein the clamp assembly retains the accessory and an open position wherein the first clamp is offset from the accessory permitting removal of the first accessory from the clamp assembly. The clamp assembly can further comprise a second clamp member having a first portion that opposes the first clamp member and cooperates with the first clamp member to clamp the accessory between the first and second clamp members. An attachment plate can carry the clamp assembly. The attachment plate can have a first mating detail formed thereon that is configured to selectively and removably mate with a complementary second mating detail on the power tool in an assembled position.

Abstract: A quill style drilling/milling end effector with high tool positioning accuracy, a pressure foot with fast response in force and displacement feedback, and with automatic mounting and dismounting, normality sensing, and through the tool coolant delivery.

Abstract: The purpose of the present invention is to provide a lathe positioning apparatus such that a work held by a chuck can be positioned at an arbitrary position in main shaft direction and the installation space and the size of the apparatus can be decreased. A lathe positioning apparatus for positioning a work W held by a chuck 6 in a main shaft 4 direction is provided with an apparatus body 12 having a shaft center along the main shaft 4 direction. An abutting portion 26 for abutting the work W is formed on a chuck 6 side end of the apparatus body 12. A mechanism for advancing or withdrawing the abutting portion 26 with respect to the chuck 6 is provided. An extension/contraction mechanism for extending or contracting the apparatus body 12 in the main shaft 4 direction is provided in the apparatus body 12. The abutting portion 26 is advanced or withdrawing with respect to the chuck 6 by the extending or contracting by the extension/contraction mechanism.

Abstract: A lacrosse stick for reducing the rebound of a ball caught therein. The head of the lacrosse stick has a socket for receiving the shaft, and incorporates one or a plurality of flexible elastomer pads within or as part of the handle or socket, where the head and handle meet, to damp impact and rebound. The flexibility of the damping pads produces a “give” that minimizes the rebound of a pocket after being impacted by a ball. This pocket dampening limits the movement of the ball and makes the ball easier to control and to retain in the pocket. The precise location of the dampening material on the lacrosse head may be varied to control the degree of pocket “give” in response to, for example, the force on the pocket created by a ball impacting the pocket during a catch or swinging in the pocket during cradling.

Abstract: A surgical instrument including a tool, a handpiece, and a locking member. The handpiece includes both a coupling member configured to cooperate with the tool, and a driver for rotating the tool. The locking member is movable from an unlocked position to a locked position in response to centrifugal force generated during rotation of the locking member. The locking member is configured to secure the tool to the handpiece when in the locked position.

Abstract: A valve assembly for a pressure vessel is disclosed that includes a valve housing operatively associated with an outlet of the pressure vessel, a frangible hermetic disc sealing the outlet of the pressure vessel, and a poppet valve mounted for movement within the valve housing between a first position supporting the frangible hermetic disc within the outlet of the pressure vessel and a second position spaced apart from the frangible hermetic disc to permit the frangible disc to burst under pressure and permit the egress of pressurized material from the pressure vessel through the outlet.

Abstract: A locking instrument assembly for use in conjunction with an intramedullary device is disclosed. The locking instrument assembly includes an inner collet, an outer body, and a knob. The inner collet has a collar and a fastener member. The knob engages the fastener member to press the outer body against the collar. As the knob mates with the fastener member, the collar applies a clamping force to the intramedullary device.

Abstract: A tool bit holder assembly includes a shank receivable in a tool holder of a rotary tool, and a body defining a socket that removably receives a tool bit. An annular recess, defined in an exterior surface of the body, has a front and rear shoulders and an axial length. A floating sleeve with a ring magnet at its front end is slidably received over the body with an elastic retainer movably received in the annular recess. The elastic retainer has an axial length less than the axial length of the annular recess to enable the sleeve to float axially between a rear position where the retainer abuts the rear shoulder and a front position where the retainer abuts the front shoulder. The sleeve is axially moveable rearward from the rear position to a parked position where the elastic retainer engages the body rearward of the rear shoulder.

Abstract: A tool connecting rod of the present invention includes a barrel and a rod. A resilient unit and a retainer are disposed between the barrel and the rod. Both of an inner wall of the barrel and a body portion of a pushing member are formed with at least two stepped recesses respectively. As such, the structure of the tool connecting rod is simple so that a tool bit assembles on and detaches from the present invention rapidly.

Abstract: A bi-directional quick change tool-less lever and wedge actuated collet chuck, a system and/or a method provide symmetrical tool bit shank holding pressure before, during and after operation of a rotary-style power tool. The collet chuck is attached to and/or is integrated with high speed, variable speed and/or low speed rotary-style power tools, such as, for example, electrically driven rotary-style power tools and/or pneumatically-driven rotary-style power tools. The collet chuck provides tool-less automatic and/or tool-less manual tightening of the collet around a shank of an accessory for-the rotary-style power tool. The collet chuck, the system and/or the method provide tool-less manual loosening of the collet for accessory replacement.

Abstract: A bi-directional quick change tool-less lever and wedge actuated collet chuck, a system and/or a method provide symmetrical tool bit shank holding pressure before, during and after operation of a rotary-style power tool. The collet chuck is attached to and/or is integrated with high speed, variable speed and/or low speed rotary-style power tools, such as, for example, electrically driven rotary-style power tools and/or pneumatically-driven rotary-style power tools. The collet chuck provides tool-less automatic and/or tool-less manual tightening of the collet around a shank of an accessory for the rotary-style power tool. The collet chuck, the system and/or the method provide tool-less manual loosening of the collet for accessory replacement.

Abstract: A rotary actuator comprises a rotatable chuck assembly and an actuating mechanism. The chuck assembly may include a chuck housing movable between retracted and deployed positions. The chuck assembly may further include a pair of jaws pivotable between open and closed positions in correspondence to the retracted and deployed positions of the chuck housing. The actuating mechanism may be coupled to the chuck assembly for rotation between “Off”, “Neutral”, and/or “On” positions.

Abstract: A hydraulic chuck assembly for a tool machine includes first and second valve units disposed to control flow of pressurized fluids into a cylindrical chamber so as to move an annular piston to thereby move a taper socket along a spindle axis. Each valve unit includes a ball movable along a valve axis radial to the spindle axis such that the ball can be further forced to abut firmly against a valve seat during a high-speed rotation. Oil leakage can be prevented to ensure firm engagement of a workpiece with a collet head.

Abstract: A holder for a bit is disclosed. The bit may include a first locking element. The holder may include a housing; a base assembly including a first hole; a second locking element partially disposed within the first hole and configured to move between a locking position in which the second locking element engages the first locking element to prevent removal of the bit, and an unlocking position in which the second locking element is spaced from the first locking element allowing the bit to be removed; and a follower assembly contained within the housing and configured to move relative to the housing and base assembly between a first position in which the follower assembly supports the second locking element in the locking position, and a second position in which the follower assembly allows the second locking element to move from the locking position to the unlocking position.

Abstract: A tensioning device for surgical elements is described. The tensioning device comprises a fixation device, a clamping device, a spring device, and a force deflecting device that interacts with the clamping device. The force deflecting device is designed to convert the spring force exerted by the spring device on the clamping device into a clamping force exerted by the clamping device on the surgical element.

Abstract: A device for clamping a stem has a body forming a piston chamber and having an axially outwardly open hole adapted to receive the stem and a plurality of collet jaws in the hole shiftable axially by a piston between an outer releasing position with its axial outer ends radially spread and an inner holding position with the ends more closely radially juxtaposed. The stem is engageable axially in the hole between the jaws and lockable in the body in the inner holding position. A main spring urges the piston and jaws axially inward into the inner position. A cover element has an outer head and is axially shiftable relative to the piston between an extended position with the head engaged radially between the outer ends of the jaws and a retracted position with the head spaced axially inward from the outer ends of the jaws.

Abstract: A device for gripping a treatment tool of a handpiece is provided that can firmly grip the treatment tool and achieve a high vibration absorbing property. The device for gripping a treatment tool of a handpiece includes: a spindle rotatably installed; and a coil spring that is set in the spindle and rotated integrally with the spindle, the treatment tool inserted from a tip of the spindle into the coil spring being gripped by an inner diameter surface of a grip portion of the coil spring, and the coil spring has an inconstant natural frequency. Preferably, the coil spring includes the grip portion in a middle region thereof, and the grip portion has a smaller inner diameter than that of other regions.

Abstract: The invention relates to a clamping device with a base body (2) which comprises a central receptacle (5) for a component or tool to be clamped, in the base body (2) at least one groove (6) being formed which is open to a face side of the base body (2), and with at least one clamping wedge (9b) which can be pressed axially into the groove (6) from the open face side of the latter to radially deform an inner wall section (7) lying between the groove (6) and the receptacle, which is characterized in that the wall (10) which defines the groove (6) on the outside is designed to be elastic over at least an axial partial section such that it is elastically deformed to the outside when the at least one clamping wedge (9b) is pressed into the groove (6).

Abstract: A collet system having greater axial load capability and debris protection includes a sleeve and a collet. The collet is disposed in a debris protected position relative to the sleeve and is radially adjacent and axially supported by sleeve.

Abstract: A first tooling component is positively secured to a second tooling component by one or more quick change locking couplers each including a cylinder secured to the first tooling component and having peripherally spaced holes supporting balls for radial movement. A stud is secured to the second tooling component and has an enlarged head portion projecting into the cylinder. A cup-shaped piston surrounds the cylinder and has a recess for receiving the balls in a released position, and a housing supports the piston for axial movement between the released position and a locked position forcing the balls to engage the stud. A compression spring moves the piston to the locked position, and air pressure moves the piston to the released position. A proximity sensor is supported by the housing and detects the piston in the locked position to provide an electrical signal to a remote visual and/or audio indicator.

Abstract: A chuck device for a machine tool includes: a center unit disposed in an axial hole in a tubular housing, extending along a hole axis of, and having a tip extending outwardly of the housing and abutting against a workpiece; a chuck unit disposed movably in the axial hole, sleeved on the center unit and including a chuck member disposed adjacent to the tip of the center unit; and a sleeve unit disposed movably in the axial hole, concentric with the housing and sleeved on the chuck unit. The sleeve unit has a pushing end portion sleeved on and abutting against the chuck member, and is operable to move relative to the housing along the hole axis such that the chuck member is driven by the pushing end portion of the sleeve unit with movement of the sleeve unit to move away from the housing and to clamp the workpiece.

Abstract: A holder for a bit is disclosed. The bit may include a first locking element. The holder may include a housing; a base assembly including a first hole; a second locking element partially disposed within the first hole and configured to move between a locking position in which the second locking element engages the first locking element to prevent removal of the bit, and an unlocking position in which the second locking element is spaced from the first locking element allowing the bit to be removed; and a follower assembly contained within the housing and configured to move relative to the housing and base assembly between a first position in which the follower assembly supports the second locking element in the locking position, and a second position in which the follower assembly allows the second locking element to move from the locking position to the unlocking position.

Abstract: A motor element for a dental medical handpiece or a motor spindle has an elongated shank, rotatably mounted in which there is a drive shaft and a longitudinally-extending rod, a tool-holder for a tool within the rod, and a disconnectable coupling between the rod and the tool-holder. A locking element secures the coupling to prevent the coupling from becoming disconnected from the elongated shank. The locking/unlocking of the coupling is effected by a relative movement between the tool-holder and the tool.

Abstract: The invention relates to a tensioning device for a hollow shaft (1), comprising tensioning claws (3), which can be adjusted between a tensioned position, in which the tensioning claws (5) are engaged in the hollow shaft holder (7) having a tensioning structure (6), and an open position without engagement in the tensioning structure (6) by a tensioning head (5) guided axially displaceably in the working spindle (4). For the adjustment between the open position and the tensioned position, the tensioning claws (3) are displaceably supported in the working spindle (4) by the tensioning head (5) at the one end in a first pivot position and subsequently at the other end in a second pivot position.

Abstract: To compensate for tolerances and diameter differences during the chucking of a tool shank (15) in a tool holder (1) of the shrink-fit chuck type, a diameter-compensating bush (17) is provided. The diameter-compensating bush (17) has an outer sleeve (19) having a tapered inner circumferential surface (25) and an inner sleeve (21) arranged coaxially therein and having a tapered outer circumferential surface (27). Once the diameter-compensating bush (17) has been put onto the tool shank (15) and the inner sleeve (21) has been drawn into the outer sleeve (19), for example by means of a ring nut (35), for the diameter compensation, the outer sleeve (19) is thermally shrunk in place in the locating section (9) of the tool holder (1). In this way, rotary tools whose tool shank (15) does not have a diameter corresponding to the diameter or the tolerance requirements of the tool holder (1) can be chucked in a tool holder (1), for example, of the shrink-fit chuck type.

Abstract: In the case of a motor element, in particular of dental technical handpiece or a motor spindle, which at least in its front region has an elongated shank, rotatably mounted in which there is a hollow drive shaft, arranged in whose front end region there is a collet chuck for a tool that is connected in its rear end region by means of a coupling to a rod that extends towards the rear and is pretensioned towards the rear or towards the front by means of the force of a spring and can be displaced towards the front or towards the rear against the force of the spring by means of an actuating mechanism, with the spring being stayed on the draw rod towards the rear and being stayed against an inner first shoulder of the drive shaft towards the front, arranged at the front end region of the spring there is at least one supporting element that is elastically pretensioned radially outwards and springs out behind the shoulder when the draw rod is pushed with the spring from the front into the drive shaft, and the suppor

Abstract: The invention relates to a tool holder 1 for a rotating tool, especially a drilling head and/or milling head, comprising a drive shaft 4 that can be connected to a drive motor and a collet chuck 2 that is non-rotatably connected to the drive shaft 4 in order to hold the tool, whereby the drive shaft 4 and the collet chuck 2 are positively connected by means of a coupling element 5 for purposes of transmitting torque. In order to securely hold the tool and to concurrently have a simple construction of the tool holder 1, it is proposed for the coupling element 5 to be axially displaceable relative to the collet chuck 2 so as to release the tool.

Abstract: A centering and holding fixture includes a base, a piston disposed within a piston chamber at least partially located within the base, and a radially flexible ring connected to the piston by force transmission apparatus operable to contract and expand the radially flexible ring by upward and downward motions respectively of the piston. The flexible ring may be slotted and may include alternating inwardly and outwardly extending radial slots extending axially through the flexible ring and extending radially inwardly and radially outwardly from radially outer and inner surfaces of the flexible ring respectively to axial stress relief holes extending axially through the flexible ring. The apparatus may further be operable to contract the radially flexible ring when the piston chamber is pressurized and to expand it when the piston chamber is depressurized. Spring loaded clamps mounted to the base may be used to secure a workpiece to the holding fixture.

Abstract: A tool holder for a tool with a recess having detent disposed therein for holding the tool axially, and having a sleeve telescoped over a collet which has flexible fingers and with the sleeve and the fingers having camming surfaces for effecting clamping onto the tool. The axial locations of the recess and the detent and the camming surfaces are such that they are all in an engaged position when the sleeve is in one position along the axis. The sleeve and the collet have chamfers interengagable upon telescopic movement between the sleeve and the collet for flexing the fingers to thereby have the collet slide into the sleeve.

Abstract: In a spindle assembly for machine tools, the axial length ? of the collar of a spring collet is determined as a function of the axial course length c of a clamping sleeve operating spring collet. This axial length ? is preferably retained within an interval ranging between 3 mm and 9 mm. A tapering surface of the collar presents an inclined profile, which is straight, curved, or at least partially curved. The angle of inclination formed by the tapering surface with the axis of the spring collet is advantageously of the order of 45°. The spring collet has at least two grooves. The gap between these grooves may be determined in such a way that, when the spring collet is in the closed position, then the workpiece is gripped with a predetermined clamping force, and the two mutually opposing faces of each groove portion abut against each other.

Abstract: The present invention comprises a machining apparatus including a work piece holder having an adapter body with an axial bore and a translating portion located within the axial bore of the adapter body. The translating portion has a proximal end for coupling with a retention knob collet of a spindle and a distal end for attaching to a collet. The work piece holder includes a retaining piece coupling the adapter body and the translating portion allowing the translating portion to move axially within the adapter body. The apparatus facilitates a rotating spindle grasping and rotating a work piece to be brought into contact with a processing tool held stationary on a work table. The present invention also includes a fixture block for attaching milling tools and other devices to a work table and a method of operating a milling machine utilizing the fixture block and work piece holder.

Abstract: A collet chuck assembly includes a mount, a selectively-axially-movable collet closing sleeve, and a multiple-segment collet head. The collet head includes two axially-spaced outer circumferential cam surfaces that engage two axially-spaced inner circumferential cam surfaces of the closing sleeve. A quick-release cap attached to the mount includes two inwardly-radially-extending tabs that engage two outwardly-radially-extending lips of the collet head to prevent the collet head from moving axially relative to the cap. Flat resilient collet seals are disposed between each set of adjoining collet segments to prevent debris from getting into the collet chuck assembly between the segments. The collet seals maintain full-surface contact with adjoining segments even when the collet head is fully opened. A slinger bore formed in the cap directs debris radially-outwardly out of the collet chuck assembly.

Abstract: A collet chuck assembly includes a mount, a selectively-axially-movable collet closing sleeve, and a multiple-segment collet head. The collet head includes two axially-spaced outer circumferential cam surfaces that engage two axially-spaced inner circumferential cam surfaces of the closing sleeve. A quick-release cap attached to the mount includes two inwardly-radially-extending tabs that engage two outwardly-radially-extending lips of the collet head to prevent the collet head from moving axially relative to the cap. Flat resilient collet seals are disposed between each set of adjoining collet segments to prevent debris from getting into the collet chuck assembly between the segments. The collet seals maintain full-surface contact with adjoining segments even when the collet head is fully opened. A slinger bore formed in the cap directs debris radially-outwardly out of the collet chuck assembly.

Abstract: A collet chuck assembly for an axially fixed collet head. The collet head is fixedly and removably mounted in a threaded bushing to prevent axial motion, and is keyed into place to prevent rotation. A sleeve assembly has cam surfaces adapted to engage the cam surfaces of the collet head to open and close the collet head, and slides between collet head open and collet head closed positions within a spindle adapter body. The sleeve assembly has projections that extend from a rearward portion and pass through appropriately sized passages in the axially-fixed bushing. Motion from a spindle drawbar is transmitted by a drawbar link-up through the projections of the sleeve assembly. Using this arrangement, no physical connection is required between the drawbar link-up and the sleeve assembly. Additionally, no cap assembly is required.

Abstract: A true length collet chuck assembly is adapted to receive and actuate a quick change, segmented collet having a flange extending radially outwardly from the outer surface of the collet adjacent a rear face of the collet. The collet chuck assembly comprises a chuck body having a longitudinally extending bore defined by an inwardly facing, cylindrical surface on the chuck body. The inwardly facing, cylindrical surface on the chuck body defines a circumferential groove for receiving the radially outwardly extending flange on the collet to thereby restrain the collet against axial movement relative to the chuck body. A collet closing sleeve, disposed within the chuck body and axially displaceable relative thereto, has an outwardly flaring interior surface adapted to engage an outwardly flaring surface on the collet.

Abstract: Each of a plurality of passages in a fixture has a piston movable therein and cooperating with a collet therein to simultaneously move each collet to its workpiece retaining position and to release each collet from its workpiece retaining position. A recess in the bottom of the fixture supports a locking nut for each passage. Each locking nut has a circular passage extending therethrough to receive an end of the collet having threads on its outer surface. The circular passage has threads of the same pitch but the threads have an interrupted portion in the circumferential and axial directions. The locking nut has a first portion movable relative to a second portion to take up the pitch clearance in the threads on the collet due to the interrupted portion of threads in the circular passage to prevent rotation of the collet prior to the piston moving the collet to its workpiece retaining position.

Abstract: A pull-to-close collet chuck for use with lathes equipped with servo-type bar loaders. The chuck is configured to be coupled to a lathe drawtube and translates linear movement of the drawtube to a work-gripping action to a collet. The chuck generally includes a ramp body surrounding a first portion of the collet and integral means for fixing the ramp body within a central bore of the chuck. A piston surrounds the collet and has a bearing surface adjacent a ramp surface of the ramp body, and a wedge is located between the ramp surface of the ramp body and the bearing surface of the piston. The wedge has multiple bearing surfaces through which the work gripping action is transferred from the piston to the collet as a result of radial inward movement of the wedge.

Abstract: A work piece holder with clamping and rotation mechanisms in a support. A holder or brake exists next to a collet and sleeve assembly to restrain the assembly from rotating. Hydraulic pumps and connections operate on the mechanisms for the clamping and rotating actions. An electronic controller is connected with the mechanisms and operates the system in a sequence for selective machining on the work pieces.

Abstract: A collet chuck includes a tubular body and a rotating shaft assembly that is journalled within the tubular body and that defines a frustoconical recess therewithin. A belt pulley is sleeved fixedly on the rotating shaft assembly. A collet is disposed operably within the recess in the rotating shaft assembly, and is adapted to hold a rod-shaped workpiece therewithin. A movable member is mounted axially and movably within the tubular body for movement in tightening and loosening directions. A front oil chamber is formed in the tubular body, and is located immediately in front of the movable member. A rear oil chamber is formed in the tubular body, and is located immediately behind the movable member. A first oil passage is formed in the tubular body and is in fluid communication with the front oil chamber so that hydraulic oil can be fed thereinto, thereby moving the movable member within the tubular body in the tightening direction so as to compress the collet.

Abstract: A true length collet chuck assembly is adapted to receive and actuate a quick change, segmented collet having a flange extending radially outwardly from the outer surface of the collet adjacent a rear face of the collet. The collet chuck assembly comprises a chuck body having a longitudinally extending bore defined by an inwardly facing, cylindrical surface on the chuck body. The inwardly facing, cylindrical surface on the chuck body defines a circumferential groove for receiving the radially outwardly extending flange on the collet to thereby restrain the collet against axial movement relative to the chuck body. A collet closing sleeve, disposed within the chuck body and axially displaceable relative thereto, has an outwardly flaring interior surface adapted to engage an outwardly flaring surface on the collet.

Abstract: A drilling or milling head, especially for printed circuit board milling machines and/or engraving machines, having a collet chuck (11) which can be actuated by a rapid change mechanism and which is driven by a transmission. The collet chuck is opened by an axial displacement relative to a clamping sleeve (50), with the force necessary for the displacement being transmitted via a friction clutch. The transmission includes a ball bearing (9) whose balls (12) are moved around a common axis in a concentric manner by a driving part (6) fixed on a motor drive shaft (5). In addition, the balls are mounted between two bearing surfaces (13, 14) which are aligned in a concentric manner with regard to the axis and which have a circular cross-section. The balls are at least partially engaged with the bearing surfaces in a positive manner.

Abstract: A pull-to-close collet chuck for use with lathes equipped with servo-type bar loaders. The chuck is configured to be coupled to a lathe drawtube and translates linear movement of the drawtube to a work-gripping action to a collet. The chuck generally includes a ramp body surrounding a first portion of the collet and integral means for fixing the ramp body within a central bore of the chuck. A piston surrounds the collet and has a bearing surface adjacent a ramp surface of the ramp body, and a wedge is located between the ramp surface of the ramp body and the bearing surface of the piston. The wedge has multiple bearing surfaces through which the work gripping action is transferred from the piston to the collet as a result of radial inward movement of the wedge.

Abstract: A fixed length collet chuck assembly for holding a workpiece in which the collet only translates radially and not axially is provided. The fixed length collet chuck has a longitudinal, central axis and includes a chuck body assembly and a collet. As a draw tube is pulled toward the spindle of a machine, such as a lathe, a tapered actuator forces ball bearings against a retaining plate and the ball bearings are forced radially outwards causing a taper ring to move axially away from the spindle and into contact with a bushing ring. The bushing ring is connected to a collet sleeve through three bushings which are radially and equally spaced around the longitudinal, central axis of the assembly. The inner surface of the collet sleeve tapers outward from the longitudinal, central axis of the assembly. A collet bears against the inner tapered surface of the collet sleeve.