Abstract: A holder for a machine tool includes a cone-shaped base body. One end of the base body has a larger diameter than the other end and includes an annular flange extending therearound. The flange includes first and second recesses formed therein. Each recess includes a bottom surface. The first and second recesses respectively form identical first distances from the bottom surface to an outer periphery of the flange. One of the recesses includes a hole. A depth-reducing element is securable in the hole such that an outer surface of the element is disposed between the bottom surface and the outer periphery, wherein an effective depth of the recess having the depth-reducing element is shorter than an effective depth of the other recess.

Abstract: A junction is proposed between two tool parts, where a first tool part has a recess in hollow cone shape, and a second tool part has a cone-shaped projection that can be inserted into the recess. The junction is characterized by the fact that the recess (7) and the projection (33) have practically the identical angle of taper, that the projection (33) is structured to be practically non-resilient, and the wall (9) that surrounds the recess (7) of the first tool part (holder (1)), is structured to be resilient, and that the two tool parts (1, 31) are provided with flat surfaces (23, 37) that rest against one another when the two tool parts (1, 31) are connected. It is essential that the two tool parts are secured together in the assembled state of the junction (1), in an axial direction by means of a clamping device in such a way that the wall (9) of the first tool part (1) is expanded.

Abstract: An end mill chucking structure for chucking an end mill having a relatively small diameter and used, for example, for deep milling of a die. The end mill chucking structure includes an end mill holder and an end mill. A holder body has a taper hole formed therein. The end mill includes an end mill body and a cutting tip provided at an end portion of the end mill body. A portion of the end mill body located opposite the cutting tip serves as a tapered shank portion. The shank portion and the rest of the end mill body are bounded by a shoulder extending outward from the surface of the shank portion. The shank portion is press-fitted or shrink-fitted into the taper hole such that the end face of the holder body abuts the shoulder of the end mill body, through application to the holder body of heat at a temperature lower than a conventional shrink-fitting temperature.

Abstract: A clamping device (1, 25, 35) for releasably clamping an insertion member (9, 27, 38) with a shank portion, the clamping device comprising a clamping member having an insertion bore (11, 26, 40) formed by the union of an access bore portion (19A, 31A, 41A) and a gripping bore portion (19B, 31B, 41B) for the free sliding insertion into and withdrawal from the shank portion in respect of the access bore portion and its clamping by a clamping surface of the gripping bore portion on its forced displacement thereinto from the access bore portion, the access and gripping bore portions having longitudinal axes (20A, 20B; 32A, 32B; 43A, 43B) spaced apart at least along a portion thereof.

Abstract: A tool assembly (10) comprising a male member (12) and a female member (14). The male member having a diameter D1 and being inserted into a variable diameter bore (28) in the front end of the female member (14). The variable diameter bore having a front end having a diameter D2 and a rear end having a diameter D3. In a non-assembled state of the tool assembly, D3 is greater than D2, and D1 is greater than D2 and greater than D3.

Abstract: The invention relates to a machining tool with a detachable head comprising: a head (2) carrying at least one cutting blade (3), a slender body (4) and means (5) for detachably fastening the head to the slender body. It is characterized in that: the head (2) comprises, in the rear part, a rotating cylinder (6) centered on the axis of rotation of the tool, and in its so-called front end, at least one lug (8) projecting from the cylindrical surface, the slender body (4) has, opening into its side facing the head, a boring (9) for housing the aforementioned rotating cylinder and a hook (10) mounted on a pivot pin (11), which hook is movable, by a control means (12), between a so-called locked position in which said hook is engaged with the so-called pivot pin of the head and a so-called released position that makes it possible to insert and remove the cylinder from the boring, and in the cylindrical wall delimiting the boring (9), at least one notch (13) for receiving the aforementioned lug (8).

Abstract: A vibration dampened spindle and tool holder assembly for a rotary cutting machine. The assembly includes a spindle and a tool holder retained therewith. The tool holder has an interfacing ledge with a top surface for abutment with a distal spindle surface, and a continuous channel disposed in a proximal portion of the top surface. A resilient dampening member, having a rectangular or a circular cross sectional configuration, resides in the channel for compressed abutment with the spindle surface. Because the dampening member is situated within the channel, the interfacing placement of the spindle surface and tool holder top surface meet as the dampening member is enshrouded in the channel by these abutting surfaces and thereby protected from contaminant entry during dampening action.

Abstract: The present relates to a spindle unit for a machine tool having a spindle rotatably held in a housing and a hydraulic tool holding system at a forward end of the spindle and capable of holding a tool on the spindle without a tool holder. The spindle of the spindle unit is provided with a tool receiving bore formed in the forward end portion of the spindle along the rotational axis thereof, one or more pressure chambers disposed around the tool receiving bore in spaced relationship from the tool receiving bore by a thin wall elastically deformable in a radial direction of the spindle, and a working fluid passage formed in the spindle and in fluid communication with the one or more pressure chambers. The spindle unit further includes a pressure adjusting device arranged in the rear portion of the spindle unit and connected to the pressure chamber through the working fluid passage.

Abstract: A tool holder is disclosed for a rotary tool having an elongated cylindrical shank. The tool holder includes an HSK body having a cylindrical bore with a predetermined inside diameter. An elongated cylindrical insert has a throughbore or collet pocket and the insert has an outer diameter larger than the inside diameter of the body cylindrical bore. Thus, the insert is insertable into the body cylindrical bore only when the body front nose is heated to a predetermined temperature at which temperature the body thermally expands to an extent that the inside diameter of the body bore is greater than the outer diameter of the insert. Upon subsequent cooling of the body, the body and insert are attached together. A collet is then used to removably and coaxially secure the tool shank to the insert within the insert throughbore. Other inserts may be used such as floating style holders, straight bore, etc.

Abstract: An adjustable bit for cutting tongues or grooves in a wooden workpiece that includes first and second cutter members adjustably mounted on a drive shaft, a plurality of spacer elements selectively mountable on the drive shaft to vary the axial spacing between the cutter members. At least some of the spacer elements preferably having varying thicknesses, and a ball bearing pilot member may be one of the spacer members. The cutter members may be formed for cutting a groove in the workpiece, or formed to cut a tongue in the workpiece.

Abstract: A tool holder assembly 10 including a tool holder 12 having a balancer assembly 21 adapted to selectively provide improved unbalance compensation.

Abstract: A router bit for forming the edges of a raised door panel which includes a rotatable drive shaft, a profile cutter fixed to the drive shaft, and a back cutter fixed to the drive shaft for rotation therewith. A cylindrically-shaped pilot member is disposed intermediate the profile cutter and the back cutter. The pilot member is fixed to the drive shaft for rotation therewith and the exterior surface of the pilot member is coated with a friction-reducing material to reduce or eliminate any significant friction between the exterior surface of the rotating pilot member and the raised door panel.

Abstract: A tool holder includes a holder body which in turn includes a shank portion, a flange portion, and a tool attachment portion; a taper cone fitted to the shank portion; an elastic member interposed between a rear-end face of the flange portion and a front-end face of the taper cone; and a stopper member disposed on the shank portion so as to support a rear-end face of the taper cone. The outer surface of the taper cone is tapered at an angle equal to that at which the wall surface of a taper hole formed in a spindle of a machine tool is tapered. The inner surface of the taper cone and the outer surface of the shank portion are equally tapered at an angle smaller than the angle at which the outer surface of the taper cone is tapered. Through drawing of the holder body, the taper cone expands radially to thereby be tightly held within the taper hole. A spacer is bonded to the end face of the spindle so as to eliminate a gap which is formed between the flange portion and a spindle.

Abstract: A coolant tube (21) is to be arranged in a tool holder, the coolant tube (21) having an inlet opening (23) for coolants, a cover (31) at the inlet opening (23) for preventing chips from entering into the coolant tube (21), and an exchangeable insert tube (59) arranged within the coolant tube (21) and holding the cover (31).

Abstract: A rotary device has a releasable tool holder. A spindle with two ends has one end adapted to secure to a rotary device and the other includes a bore to receive a tool. A mechanism to retain and release the tool from the spindle bore is coupled with the spindle adjacent the bore end. At least two unlike retention members to apply a force on the tool in the bore are adjacent the bore. A sleeve surrounds the bore end of the spindle as well as the at least two unlike retention members. The sleeve has a common surface to apply a force on the at least two unlike retention members such that when the sleeve is axially moved along the spindle, the force is varied with respect to the position of the surface on the retention member. This force maintains the tool in the bore or enables the tool to be removed from the bore. A biasing member maintains the sleeve in a retention position on the spindle.

Abstract: A tool holder of the hollow taper shank in a tool machine is disclosed. A resisting block supported by a spring is received within a tool holder. As the short knife is disposed within the tool holder, the elastic force of the spring can be overcome. At first, a plurality of steel balls and a resisting block are pushed inversely until the front edge of an wider portion of the short knife passes through the steel ball. Now, the spring will release the energy from elastic deformation so as to enforce the resisting block to move forwards and outwards so as to return to the original position. Thereby, the knife can be firmly secured.

Abstract: A cutting tool including a tool holding portion and a tool. The tool is configured to be inserted into a hole of the tool holding portion. The tool includes a tool main body, a guide portion, and a shoulder portion. The tool maim body has a tool outer diameter larger than the hole inner diameter of the hole when the tool holding portion is not heated. The guide portion is coaxially connected to the tool main body and configured to position the tool substantially coaxially with respect to the tool holding portion. The guide portion has a guide outer diameter smaller than the hole inner diameter of the hole so that the guide portion is inserted into the hole. The shoulder portion is formed between the tool main body and the guide portion so as to sit on a surface around the hole to support the tool when the guide portion is inserted into the hole.

Abstract: A vibration dampened spindle and tool holder assembly for a rotary cutting machine. The assembly includes a spindle and a tool holder retained therewith. The tool holder has an interfacing ledge with a top surface for abutment with a distal spindle surface, and a continuous channel disposed in a proximal portion of the top surface. A resilient dampening member, having a rectangular or a circular cross sectional configuration, resides in the channel for compressed abutment with the spindle surface. Because the dampening member is situated within the channel, the interfacing placement of the spindle surface and tool holder top surface meet as the dampening member is enshrouded in the channel by these abutting surfaces and thereby protected from contaminant entry during dampening action.

Abstract: A rotary machine tool holder has therein intermediate its ends a plurality of balancing screws that are mounted in internally threaded blind bores that extend part way into the holder from equi-angularly spaced points about an outer peripheral surface formed on the holder intermediate its ends, and coaxially of an axial bore in the holder. The screws are adjustable along axes disposed substantially tangentially of the axial bore of the holder, and are prevented from projecting radially beyond the outer peripheral surface of the holder by a plurality of cap screws removably mounted in the holder to have the heads thereof restrict the extent to which the balancing screws can be adjusted toward the outer surface of the holder.

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 shrinkage-fit tool holder having a tool holder body 11 having a portion 2 adapted to be connected to a machining center, a manipulator-engaging portion 3, a chuck portion 4 and a tool-holding member 6 for firmly holding a shank of a cemented carbide tool by shrinkage fitting, at least the tool-holding member 6 being made of specialty steel having an austenitic structure that is strengthened by precipitation hardening or work hardening.

Abstract: In an interference fit type cutting tool according to the present invention, a head section and a shank section are fitted together by shrinkage fitting. The shank section is provided with a shaft portion and a taper portion. The head section is provided with a hole portion to be fitted on the shaft portion, and a tapered portion to be fitted on the taper portion. The hole portion and the tapered portion have an interference, and the inner diameters thereof are smaller than the outer diameters of the shaft portion and the taper portion. Two-surface restraint is established by fixing the shaft portion and the hole portion, and the taper portion and the tapered portion with the interference pressure by shrinkage fitting. A key is formed on the leading end face of the shaft portion, a key groove is formed in the bottom face of the hole portion, and the key and the key groove are fitted together.

Abstract: An arrangement for a hydraulically operated tool holder has a pressurizing system for operating a clamping device for a tool or workpiece. The pressurizing system comprises a movable operating element for pressure generation whereby the movement of the operating element causes a movement of a guideway which has an inclined or end or bend surface with respect to its direction of movement. The guideway coacts with the actuator rolling or sliding at the surface thereof whereby the movement resulting from the movement of the guideway is transmitted to at least one pressure transfer piston in a pressure cylinder. The pressure transfer piston comprises at least one support part for the actuator and a lip seal and coacts with the clamping device.

Abstract: A milling tool holder comprising an elongated body adapted to be supported on a milling tool base. The body has a shank-receiving bore. A tool head supports a pair of indexable inserts, and has a shank received in the shank receiving bore to a position in which an annular face on the head faces a similar face on the body. A pair of projections on the face of the body is received in a pair of openings in the tool head to prevent the tool head from rotating with respect to the body.

Abstract: A balance weight has first and second margins at right angles to one another with the second margin larger than the first margin. A balance weight groove in a rotor has outer and inner wall portions, with the outer wall portions spaced a distance less than the spacing between the inner wall portions. The balance weight has a central threaded opening receiving a screw and a driving slot in the upper face of the weight. An insertion tool is threaded to the balance weight to insert the balance weight through a turbomachinery access opening into the groove. The tool is rotated to locate the second margins below the outer wall portions of the groove. By inserting a driving tool through the insertion tool, the screw is rotated to lock the balance weight to the rotor and in the groove. Upon removal of the insertion and driving tools, a staking tool is inserted through turbine access opening to stake the balance weight and rotor and the screw and balance weight.

Abstract: A damped tool holder system having, in combination, a longitudinally extending cylindrical tool provided with a forward outer cutting or operating end and a rearward inner end which is to be held within a tool holder; a coaxial tool holder receiving the inner end of the tool; a rigid mechanical support connection between the tool and the tool holder at a first region thereof; and a second annular support connection between the tool and the tool holder at a second region thereof spaced from but adjacent the first region and effected by a vibration damping annular film structure disposed therebetween at said second region.

Abstract: A tool interconnect structure includes a spindle adapter, a rotary cutting tool, and a lock mechanism securing the rotary cutting tool to the spindle adaptor. The spindle adapter has a face and a short hollow tapered shank at the face. The rotary cutting tool has a face for engaging the spindle adaptor face and a tapered recess at the face for cooperating with the tapered shank. The lock mechanism includes a first retention stud secured within the tapered recess, a second retention stud secured within the tapered shank, first and second lock elements located within the hollow tapered shank and on opposite sides of the retention lugs, and a universal screw extending through the lock elements for selectively interconnecting the locking elements with the first and second retention studs.

Abstract: A replaceable cutting head is adapted for co-axial coupling thereof, along a coupling axis, with a tool shank in a self-clamping fashion. Both the cutting head and the tool shank have a mounting portion comprising a centering section and a positioning section. The centering section is formed with a peripheral centering surface which extends circumferentially with respect to the coupling axis and has a substantially conical shape at least at two portions thereof. The positioning section has at least two peripherally disposed and circumferentially extending and spaced apart positioning surfaces adapted for the provision of an axial support of the cutting head on the tool shank. Each positioning surface is inclined with respect to the coupling axis so that an axial distance therefrom to a broad end of the peripheral centering surface increases in a direction generally corresponding to the direction of cutting forces acting on the cutting edge during a cutting operation.

Abstract: A tool holder includes a body, a collet, and a collet mover. The body is formed to include a collet chamber and a collet-mover chamber arranged to communicate wit the collet chamber. The collet includes a tool-gripping surface arranged to define a tool-receiving chamber adapted to receive a machine tool therein. The collet is mounted for movement in the collet chamber along a central axis of the body between a tool-grip position to cause the tool-gripping surface to move radially inwardly toward the central axis to grip the machine tool in the tool-receiving chamber and a tool-release position to cause the tool-gripping surface to move radially outwardly away from the central axis to release the machine tool. The collet mover is positioned to lie in the collet-mover chamber and is coupled to the collet to draw the collet along the central axis to the tool-grip position.

Abstract: A tool interconnect structure includes a spindle adapter, a rotary cutting tool, and a lock mechanism securing the rotary cutting tool to the spindle adapter. The spindle adapter has a face with a short hollow tapered shank at the face. The rotary cutting tool has a face for engaging the spindle adapter face and a tapered recess at the face for cooperating with the tapered shank. The lock mechanism includes a pair of blocks having shoulders at their ends adapted to engage annular grooves within the hollow tapered shank and within the rotary cutting tool. The blocks have threaded apertures therethrough and a screw having oppositely threaded end portions extends through the apertures. Rotation of the screw causes the shoulders to engage with and disengage from the grooves.

Abstract: An improved insulated, heat shrink tool system and method of assembly, which utilizes an insulating sleeve within the internal opening of a heat shrink tool holder wherein the insulating sleeve has a thermal conductivity less than that of the tool holder. In use the tool holder, is heated by means of an induction heating system, or hot air. As the tool holder is heated it expands outwardly thereby enlarging or increasing the internal diameter of the holder. The internal section of the holder is lined with an insulating sleeve prepared from titanium or a titanium alloy having a thermal conductivity less than that of the holder. The insulating sleeve is brazed to the inner wall of the holder so that the expansion of the holder during heating will result in a simultaneous, and equal expansion of the inner diameter of the insulating sleeve. The shank of a cutting tool is than inserted within the insulating sleeve of the holder and the holder is allowed to cool.

Abstract: A tool coupling includes first and second bodies held together by a clamping mechanism. The first body includes a first surface having a first serration formed therein, a first hole extending through the first surface, and a side surface having a second hole extending therethrough and intersecting the first hole. The second body includes a second surface facing the first surface and including a second serration configured to mesh with the first serration. A drawbar projects from the second surface and extends into the first hole. The drawbar includes a plurality of wedge surfaces. The clamping mechanism includes a screw disposed in the second hole and nuts threadedly mounted thereon for movement toward and away from the drawbar. Each nut includes a plurality of wedge surfaces arranged to engage the wedge surfaces of the drawbar to pull the second body toward the first body in a manner bringing the first and second serrations into meshing engagement with one another.

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 tool for cutting machining includes a holder, a cutting head and a threaded fastener for fastening the cutting head to the holder. The cutting head is formed of injection molded cemented carbide and includes at least one cutting edge. The holder has a front surface and the cutting head has a support surface provided to releasably abut the front surface substantially in a radial plane. A central blind hole is provided in the support surface. An insert formed of a material softer than injection molded cemented carbide is secured in the blind hole. The insert includes a thread cooperating with a thread of the fastener for pulling the cutting head toward the holder in response to rotation of the fastener. By further tightening the fastener after the support surface abuts the front surface of the holder, the contact between the thread of the fastener and the thread of the insert forces the insert radially outwardly against a wall of the blind bore.

Abstract: A machine tool extension for use with a cutting tool having a generally cylindrical shank portion. The machine tool extension comprises an elongate, generally cylindrical shank which is fabricated from a thermally expandable material and includes a first end and a second end which defines a peripheral edge. Extending axially within the second end of the shank is a bore having a diameter which is slightly less than the diameter of the shank portion of the cutting tool. The second end of the shank is formed with a slight inward radial taper such that the bore terminates inwardly of the peripheral edge of the second end.

Abstract: A two-surface constrainable tool has two retaining surfaces by which the two-surface constrainable tool retains itself on a spindle (10) of a machine tool. The two-surface constrainable tool comprises: a bottom grip taper shank (14) having a taper part (15) having a first retaining surface and capable of being closely fitted in a taper bore (12) formed in the spindle (10), and a flange (16) provided in one end surface (16a) thereof facing the end surface (10a) of the spindle (10) with a groove (18); and a collar (20) to be interposed between the end surface (16a) of the flange (16) and the end surface (10a) of the spindle (10), consisting of two symmetrical segments (20a, 20b) having ridges (22a, 22b) to be fitted in the groove (18) of the flange (16), and a second retaining surface to be brought into close contact with the end surface (10a) of the spindle (10). The bottom grip taper shank (14) retains itself by the first and the second retaining surface on the spindle (10).

Abstract: A description is given of a set (10) consisting of a spindle (1) and tool (2) for machining operations to remove shavings by means of rotation, wherein the clamping of tool (2) is accomplished by the action of centrifugal force acting on one or more of the parts that comprise the set, whereby said spindle (1) ends in a cylindrical cavity (3), inside of which is coaxially secured a cylindrical member (5), whose part that faces tool (2) has one or more diametral cuts (6) that divide it into two or more symmetrical portions (5s, 5t) that are able to bend outward in the radial direction under the action of centrifugal force, and wherein tang (7) of said tool (2) ends in a hollow cylindrical tube (7e) that is able to accommodate at least part of said portions (5s, 5t) of said cylindrical member (5), the walls of which have a thickness (S) that is equal to distance (D) between interior wall (3k) of said cylindrical cavity (3) of spindle (1) and the exterior wall of said cylindrical member (5), whereby during the ab

Abstract: A rotary device has a releasable tool holder. A spindle with two ends has one end adapted to secure to a rotary device and the other includes a bore to receive a tool. A mechanism to retain and release the tool from the spindle bore is coupled with the spindle adjacent the bore end. At least two unlike retention members to apply a force on the tool in the bore are adjacent the bore. A sleeve surrounds the bore end of the spindle as well as the at least two unlike retention members. The sleeve has a common surface to apply a force on the at least two unlike retention members such that when the sleeve is axially moved along the spindle, the force is varied with respect to the position of the surface on the retention member. This force maintains the tool in the bore or enables the tool to be removed from the bore. A biasing member maintains the sleeve in a retention position on the spindle.

Abstract: A tool holder has a shank, a flange and a tool holding portion. From its front to rear end, the shank has on its outer periphery a first cylindrical surface, a tapered surface, and a second cylindrical surface. A tapered sleeve is mounted on the shank. Belleville springs are mounted between the large-diameter end of the tapered sleeve and the flange of the tool holder. The tapered sleeve is formed with a tapered outer surface adapted to be brought into close contact with a tapered inner surface of a bore formed in the spindle, and a cylindrical inner surface adapted to be brought into close contact with the second cylindrical surface of the shank. If a gap forms between the spindle and the tapered sleeve when the spindle is rotating at a high speed, the tapered sleeve is urged by the belleville springs in such a direction that the gap disappears, thereby maintaining a centripetal tendency and rigidity.

Abstract: A shaft assembly including an inner hub having a centrally-disposed bore therethrough and an outer surface for carrying a first member concentrically thereon for rotation therewith, an outer hub having a centrally-disposed bore therethrough and an outer surface for carrying a second member thereon for rotation therewith. The bore of the outer hub is adapted for receiving the inner hub concentrically therein for rotation therewith. An outer pressure-expansible sleeve is provided for being concentrically-mounted within the bore of said outer hub and pressurized for locking the outer hub onto the inner hub. An inner pressure-expansible sleeve is concentrically-positioned in the bore of the inner hub and pressurized for locking the inner hub onto a rotatable spindle, whereby the inner hub and outer hub and the respective members mounted thereon are locked in fixed, concentric relation relative to each other and to the rotatable spindle.

Abstract: A tool holder includes a holder body having a first section to be attached to a machine and a second section coaxially exteding from the first section, a ring in which part of the holder body is received, and an assembling device for removably assembling the ring to the holder body. The holder body further has a contacting portion facing the machine side and with which at least part of the ring is brought into contact.

Abstract: A device for receiving a tool or support element in a machine tool or spindle has a tool carrier receiving member arranged in a machine tool or spindle and a tool carrier having a tool receiving member for a tool as well as a clamping device for securing the tool carrier in the tool carrier receiving member. The tool carrier has two areas, wherein a first area includes the tool receiving member and wherein a second area is designed to be received in the tool carrier receiving member. The second area includes the clamping device. The two areas are merged with one another in the axial direction of the device by overlapping the areas.

Abstract: A tool holder includes a holder body having a first section to be attached to a machine and a second section having a substantially constant diameter and coaxial with the first section, a ring extending around the second section, and an assembling device for removably assembling the ring to the holder body. The assembling device is releasably engaged with an inner face of the ring and an outer face of the second section to removably assemble the ring to the holder body.

Abstract: A chuck comprises a mounting base 11, and a protruding shaft 12 protruding from a center of a front surface of the base and having a tapered surface 13 on the outer peripheral surface thereof. A hole 16 is formed in the protruding shaft and has an opened end surface, and the hole has holding portions 14 and pressure portions 15. The holding portions and the pressure portions are alternately arranged, and the holding portions are situated at a plurality of positions evenly spaced about an inner periphery of the shaft 12, and each of the holding portions has a short radius from the center of hole 16. The pressure portions are situated between the holding portions and have a long radius from the center of hole 16. A rotating cylinder 20 is detachably fitted outside the protruding shaft, and a group of rollers 21 is arranged inside the rotating cylinder that the axis of the group of rollers is aligned along the axis of the rotating cylinder and so that they are supported by appropriate means.

Abstract: A rotary device has a releasable tool holder. A spindle with two ends has one end adapted to secure to a rotary device and the other includes a bore to receive a tool. A mechanism to retain and release the tool from the spindle bore is coupled with the spindle adjacent the bore end. At least two unlike retention members to apply a force on the tool in the bore are adjacent the bore. A sleeve surrounds the bore end of the spindle as well as the at least two unlike retention members. The sleeve has a common surface to apply a force on the at least two unlike retention members such that when the sleeve is axially moved along the spindle, the force is varied with respect to the position of the surface on the retention member. This force maintains the tool in the bore or enables the tool to be removed from the bore. A biasing member maintains the sleeve in a retention position on the spindle.

Abstract: A tool holder that uses a dampening drive member to reduce slippage between the tool holder and the spindle and while further eliminating harmonic resonance. The tool holder is used in a rotating spindle that has at least one cam recess formed on a lower face thereof. The tool holder includes a conically tapered shank portion which is insertable into the spindle. Disposed adjacent to the shank portion is a flange portion. Extending about the flange portion is a compressible dampening drive member that has at least one cam portion sized and configured to engage a respective one of the cam recesses of the spindle. When the tool holder is secured to the spindle, the dampening drive member is compressed therebetween. The dampening drive member is adapted to eliminate harmonic resonance attributable to the use of the tool holder and prevent slippage between the tool holder and the spindle.

Abstract: A cutting tool assembly wherein a cutting head is releasably retained by a tool holder by using of interacting coupling members, with one of the coupling members being inserted into a cavity of the other coupling member, with radially extending abutment wings of said one coupling member passing respectively between successive support wings of the other coupling member, rotation of the one coupling member resulting in the abutment wings abutting and resting on the support wings, thereby effecting a retaining coupling between said cutting head and said tool holder.

Abstract: A chuck includes a holder body, a clamp sleeve, and a large number of needle rollers. The holder body has a shank portion, a flange formed at one end of the shank portion, and a chuck sleeve that extends from the flange in the direction away from the shank portion. The clamp sleeve is fitted onto the outer circumference of the chuck sleeve such that the clamp sleeve is rotatable and axially movable relative to the chuck sleeve. The needle rollers are disposed between the chuck sleeve and the clamp sleeve over the entire circumference. The clamp sleeve is rotated to cause the needle rollers to revolve spirally along the outer circumferential surface of the chuck sleeve while rotating about their own axes in order to decrease and restore the diameter of the chuck sleeve. In the chuck, a groove having a predetermined depth is formed in the end surface of the flange opposite the shank portion such that the groove surrounds the base end of the chuck sleeve through which the chuck sleeve is joined with the flange.

Abstract: An engraving tool includes an end portion extending to a tip, a pair of flutes in the end portion and wall sections between the flutes. The wall sections are ground in the area of the tip to form surfaces having cutting edges and facets disposed at specific angles relative to a plane perpendicular to axis.

Abstract: A plastic tool pocket mounts to tool storage chain in a machining center. The tools all have a hollow, tapered tool shank, which fits into tool pocket. The hollow tool shank has an internal relief and retention groove for securing the tool shank with a machine spindle. The tool pocket has central support shaft, having a circular spring ring loosely fitted into an annular clearance groove. When the tool shank slides over the support shaft, the circular ring first deflects radially into the clearance groove, then pops out into the retention groove, to hold the tool shank in position.