Abstract: A tool mounting apparatus comprises a main shaft including an insertion hole and a stop flange, and an insertion part including a main body, an annular engage member disposed around the main body, wedge members and an annular clamp member disposed outside the annular engage member and biased in the axial direction. When the main body with a tool mounted is put in and abuts the insertion hole and lock nails formed on the annular engage member engage the stop flange, the wedge members are held firmly by the annular clamp member in the bottom portion of the space between a first receive wall provided on the main body and a second receive wall provided on the annular engage member. The tensile force exerted from a work piece through the first wall, the wedge members, the second wall and the lock nails is borne by the stop flange and does not move the tool.

Abstract: A mechanical chuck for clamping the shank of a tool comprises a receiver having a forwardly open, rearwardly tapering socket. A pull rod is mounted for front-to-rear reciprocation in the socket. The pull rod is connectible to the tool shank. A plurality of pins are mounted in the receiver for front-to-rear movement therein. Rear ends of the pins engage the pull rod. A nut is threaded on the outside of the socket so that when rotated, the nut displaces the pins rearwardly. The pins displace the pull rod and shank rearwardly, so that the shank is tightly engaged in the socket.

Abstract: A traction drive tool adapter is adapted to detect an overload on a planetary roller speed increasing mechanism which occurs due to an excessive depth of out, and prevent the breakage of the planetary roller speed increasing mechanism and the imperfect processing of a workpiece. It consists of a rotary portion, and a tool mount portion rotatable with respect to the fixed portion and rotary portion and adapted to attach a tool to a front end section thereof, all of these three portions are put together via a planetary roller speed increasing mechanism.

Abstract: In a milling machine or the like having a socket for a removable arbor having, a frictional engaging member is positioned around the removable arbor such that the frictional engaging member is positioned between the removable arbor and the spindle when the arbor is inserted into the spindle. A flange is positioned below the clamping member on the removable arbor to limit the downward motion of the clamping member and to communicate with the spindle to limit the inward placement of the arbor within the spindle. A sleeve connects the arbor to a drawbar and a drive collar engages the arbor with the spindle for rotation.

Abstract: The invention relates to a device for removably securing a tool (12) to the spindle (10) of a machine tool with a fitting aperture (16) concentric with the spindle axis, a fitting pin (18) engaging in the fitting aperture (16), two clamping bolts (26) arranged in the fitting pin so as to be radially movable towards opposite sides, a clamping member (32) movable axially by means of a tensioning mechanism fitted on the spindle side and two tapered surfaces (48, 30) fitted on the clamping member (32) on the one hand and on the clamping bolts on the other for the radial adjustment of the clamping bolts (26) between a release position withdrawn in the fitting pin (18) and a clamping position shifted radially outwards.

Abstract: Disclosed herein is a rotary cutter for cutting gears, couplings and the like. The rotary cutter comprises a cutter head having an axis of rotation, a centering disc located adjacent to a side of the cutter head and concentric with the axis and a cutter ring, centered by the centering disc, on the cutter head. The centering disc has a tapered outer edge surface that abuts against and is complementary with the tapered surface of the bore of the cutter ring. The cutter ring is centered once the surfaces are complementary. Once centered, the cutter ring is secured to the cutter head. The rotary cutter of the present invention enables the cutter ring to rotate true about the axis of a machine tool.

Abstract: Disclosed is an improved inner surface shaper comprising, on a bed, a first reciprocating stock having a first working spindle and a drive screw, a servomotor to drive the drive screw for making a linear reciprocation of the first reciprocating stock, a second reciprocating stock having a second working spindle, a hydraulic cylinder to drive the second reciprocating stock toward and apart from the first reciprocating stock, and a tool rest placed between the first working spindle and the second working spindle. The first working spindle, second working spindle, drive screw and hydraulic cylinder are arranged along the center line of the bed, and the hydraulic cylinder and first reciprocating stock are connected by two joint rods which are arranged symmetrically with respect to the center line of the bed.This arrangement has the effect of directing undesired counter force to the joint rods and the longitudinal axis of the drive screw.

Abstract: A cutting tool holding assembly is arranged for rapid replacement of cutting tools on machine tools. The assembly includes an adaptor for locating a tool holder in a drive spindle. The adaptor has a base member which is secured in the spindle and a body member which is secured releasably to the base member. The tool holder is secured to the body member. The base member is secured in the base of a bore in the spindle and the body member is releasably secured against rotation relative to the spindle.

Abstract: In a hobbing machine of the type with a pair of coaxial heads driving a hob supported between them, one of which capable of movement toward and away from the other and one affording a key positioned to engage a slot associated with the hob, the slot is incorporated directly into the hob, and each head carries an axially hollow alignment spigot with a stop collar, matched to and insertable in the axial bore of the hob to a depth determined by interaction of the relative collar with the end of the hob; equipping one of the heads with a coaxial tension rod insertable through the bore of the hob, and the other head with a clamping mechanism capable of gripping and tensioning the rod, the necessary rigidity is obtained without the use of an arbor.

Abstract: A centrifugal spindle is described comprising a hollow shaft (1) having a collet (2) at one end for gripping a tool shank (12) and a centrifugal loading means (3) housed within the shaft (1). The loading means comprises two coaxial pistons (4,5) spaced from each other and linked by flexible connecting members (6) and intermediate bob weights (7). One piston (4) is secured axially to the hollow shaft (1) while the other piston is secured to the collet so that rotation of the shaft (1) causes the weights (7) to move radially outwards under centrifugal force to draw the piston (5) and collet (2) into the hollow shaft (1) gripping the tool shank (12). The collet may have spring loaded jaws forcing them into the closed position.

Abstract: A high speed spindle is provided which includes a rotor driven by an electric motor and provided with tapered journals received in tapered rubber bearings. Lubricating water flows to the bearings through metered openings in the journals, flowing from the openings through reverse spiral grooves in the journals which have diminishing cross section. The water flowing through the rotor also cools the rotor, as well as the collet driven by the rotor and a tool held by the collet. Rubber seals around the rotor shaft wear to a zero clearance during run-in for confining the water that exhausts from the bearings. Compressed air is introduced into the spindle to cooperate with the seals in preventing water leakage. The compressed air also reacts against a bladder that is arranged to impose an end load on one of the bearings, which is movable, to urge the bearing toward its journal. The force is varied to increase the bearing end load as rotor speed increases.

Abstract: A quill is rotated in a spindle and carries a tool which is rotated with the quill about a common axis. The tool is held in a bore in the quill by a gland or sleeve that forms a portion of the bore and is expanded into contact with the tool by hydraulic pressure produced by one or more threaded pistons acting on a closed volume.

Abstract: A device for connecting two tool parts having a common axis. The device includes a fitting pin projecting axially from the first tool part and a connecting sleeve projecting from the second tool part and having a mating bore for receiving the fitting pin. A tightening mechanism equipped with a tightening bolt movable in a crossbore of the fitting point assures a sufficient planar surface to planar surface tightening between the two tool parts. Aside from the tightening in direction of the tightening bolt, a clamping of the fitting pin into the mating bore of the connecting sleeve is achieved through suitable measures, the clamping extending transversely with respect to the tightening-bolt direction and resulting in an automatic centering of the tool parts with respect to their common axis and in a reinforcement of the connection transversely with respect to the tightening-bolt axis.

Abstract: Disclosed herein is a rotary cutter for cutting gears, couplings and the like. The rotary cutter comprises a cutter head having an axis of rotation, a centering disc located adjacent to a side of the cutter head and concentric with the axis and a cutter ring, centered by the centering disc, on the cutter head. The centering disc has a tapered outer edge surface that abuts against and is complementary with the tapered surface of the bore of the cutter ring. The cutter ring is centered once the surfaces are complementary. Once centered, the cutter ring is secured to the cutter head. The rotary cutter of the present invention enables the cutter ring to rotate true about the axis of a machine tool.

Abstract: A tool holder assembly, having a central tool holding shaft (1) provided, on the one hand, with a mounting cone for securement in a machine tool spindle and, on the other hand, on the side opposite the cone, with an intermediate cylindrical body provided at its forward portion with securement structure for a tool. It is provided also with a feeler device (2) centered on the central shaft (1) and guided in translation on this latter, with lubricating structure and with cleaning structure for the machining region at the location of application of the feeler device (2).

Abstract: An improved tool holder having a body with means for connecting the tool holder to a numerical controlled machine or universal milling and boring machine and for driving the tool holder and means by which machine tools can be connected to the tool holder. The tool holder body is of malleable and ductile aluminum with an exterior coating of no less than 60 rockwell hardness.

Abstract: An abrasive disc exchange apparatus for use in a vertical spindle grinding machine includes a cover member surrounding an abrasive disc, and has an opening disposed in a radial direction of the abrasive disc for the passage of the abrasive disc therethrough. The cover member has a lid for closing the opening, and the lid is movable into an open position where the lid opens the opening. A guide rail accommodating device is provided for accommodating a guide rail. A support device is provided for holding the guide rail horizontally so as to allow the guide rail to extend toward the spindle housing when the lid is moved to its open position. An abrasive disc-carrying slide carries each of the upper and lower abrasive discs, and is engageable with the guide rail for movement therealong into and out of the space below the spindle housing when the guide rail is disposed horizontally.

Abstract: Disclosure is made of a bar-clamping device having a hollow spindle carrying first and second collets, each provided with a closing drive ensuring independent axial motion of one of the collets relative to the other. The closing drives of each collet are installed in the spindle and designed so that the axial efforts produced during clamping of a bar are directed in the opposite directions.

Abstract: A traction drive tool adapter, has a rotary portion provided at its front half section with planetary roller-inserting bores extending radially from the outer circumferential surface of the rotary portion into a central bore therein, each of the roller-inserting bores having planetary rollers driving shaft member-setting grooves continuing from two ends of the roller-inserting bore that are opposed to each other in the axial direction of the central bore.

Abstract: A machine tool has a machine tool body (3), a spindle (1) having a supporting portion (2) and being rotatably supported by the machine tool body (3), and a tool holder (5) having an inserting portion (6) attached to the supporting portion (2). A coating layer (10) made of a hard material including titanium is provided on the supporting portion (2) of the spindle (1) and/or the inserting portion (6) of the tool holder (5).

Abstract: A machine tool comprises a spindle stock (11) in which a spindle (13) is seated for rotation about a spindle axis (14). The spindle (13) is provided with a receptacle (20) for the taper (21) of a toolholder (22). A first annular groove (31) is arranged in a stationary ring bearing (12) of the spindle stock (11), adjacent a first end of at least one duct (34) provided in the rotatable spindle (13), the other end of which terminates in a blow-off outlet (35) opening into the receptacle (20). The first annular groove (31) can be connected to a compressed-air source (38). In the stationary condition of the spindle (13), an elastic annular seal (42, 43) can be applied in sealing relationship between the stationary bearing ring (12) and the spindle (13), on both sides axially of the first annular groove (31), by the action of compressed air. A second and a third annular groove (40, 41) are arranged in the ring bearing (12), on either side of the said first annular groove (31) in the axial direction.

Abstract: The present invention relates to a system for attaching a tool holder to a machine tool which includes an automatic hook-up of an electrical, pneumatic or hydraulic connector to supply power to the tool holder. The system includes an attaching sleeve slidably mounted on the tool holder mounting stud. A spring interposed between the mounting stud and the attaching sleeve exerts a biasing force on the attaching sleeve. The power connector is separable and has a portion attached to the machine tool and a mating portion movably attached to the tool holder. A pin interconnects the attaching sleeve and the movable mating portion of the connector.

Abstract: A working tool holder for a drilling or chiseling device includes a holder sleeve with an axially extending conically shaped section within a holder opening or bore. A working tool to be secured in the holder sleeve, has a tool shaft with a conically shaped section to engage the conically shaped section in the holder opening. Grooves are formed in the tool shaft to receive inwardly projecting ridges in the holder opening. The tool shaft has recesses to receive the pins mounted in the holder sleeve. The tool shaft and an actuating sleeve extending around the holder sleeve each have connecting threads for securing the working tool in the holder.

Abstract: An apparatus for machining axially symmetrical workpiece surfaces. The apparatus includes two vises for the workpiece that is to be machined, and two headstocks, each of which has an arbor for a respective tool, with the two tools being aligned with one another. The ends of the two tools that face one another are supported against one another in such a way that the tools can be shifted axially relative to one another.

Abstract: A device for connecting two tool parts having a common axis. The device includes a fitting pin projecting axially from the first tool part and a connecting sleeve from the second tool part and having a mating bore for receiving the fitting pin. A tightening mechanism equipped with a tightening bolt movable in a crossbore of the fitting pin assures a sufficient planar surface to planar surface tightening between the two tool parts. Aside from the tightening in direction of the tightening bolt, a clamping of the fitting pin into the mating bore of the connecting sleeve is achieved through suitable measures, the clamping extending transversely with respect to the tightening-bolt direction and resulting in an automatic centering of the tool parts with respect to their common axis and in a reinforcement of the connection transversely with respect to the tightening-bolt axis.

Abstract: A machine spindle is formed with an axially centered forwardly flared large-diameter seat, provided in the seat with at least two axially and radially displaceable spindle jaws, having an axially displaceable actuating rod axially coupled with the jaws, and formed with cam formations engageable with the jaws to move same together on axial rearward displacement. A transfer body or a tool is normally also centered on the axis and formed with an axially centered rearwardly tapered small-diameter stem substantially smaller than the seat.

Abstract: A tool holder system for stationary or rotatable tool holders in machine tools with manual or automatic tool change, has a tool holder provided with a mechanism for locking the tool head onto clamping surfaces, and integrated liquid coolant supply and a compressed air supply to the clamping surfaces. At the clamping end of the tool holder, a checkvalve is provided in the air supply passage to block incursion of liquid coolant even at high pressures of the latter and thus prevent corrosion and damage which may result from such corrosion.

Abstract: A clamping device for releasably securing a tooling adaptor in a tool clamp block comprising a generally cylindrical member having an eccentric slot for engaging and securing the tooling adaptor, the cylindrical member adapted to move in the direction of its longitudinal axis to reversibly load and engage the tooling adaptor.

Abstract: A spindle driver for a machine tool is disclosed which is adapted to move the spindle and a tool driven thereby in a helical path with variable pitch and with an orbital radius which may be varied. A quill is mounted on a support member and driven by a variable pitch drive mechanism in the form of a differential lead screw to provide a selectable ratio of axial motion to rotative motion of the quill. A spindle carrier is rotatably mounted on the quill for rotation about an eccentric axis offset from the quill axis. A spindle motor and a spindle driven thereby is mounted on a carrier with the spindle axis offset from the eccentric rotation axis. The orbital radius for the spindle is adjustable by rotation of the spindle carrier about the eccentric rotation axis to adjust the offset of the spindle axis.

Abstract: A cutting tool for a lineal milling machine has a female tapered surface for close tolerance matching to the outer, male tapered surface on the outside of the spindle which mounts the cutting tool to provide the maximum width of support for the cutting edge. The cutting edges comprise a plurality of carbide inserts, each with its own flute formed in the body of the tool, such that as the cutting tool is rotated at high speed an annulus of cutting surface is created which is ideally suited for use with the following method. A new method for lineal machining includes the steps of advancing the cutting tool into the workpiece to form a substantially arcuate edge, retracting the cutting tool from the workpiece, indexing the cutting tool to an overlapping position, and then advancing the cutting tool into the workpiece to remove the amount of overlap, with those steps being repeated to mill pocket openings or for any other lineal milling application.

Abstract: A holder for rotary material removing tools which are used in machine tools has a housing with two coaxial sections which can be held end-to-end by a set of male coupling elements provided in one of the sections and extending into a groove of the other section. The other section carries a shaft or spindle which transmits torque to a material removing tool, and the other section is separable from the one section when the male coupling elements are extracted from the groove by discrete fluid-operated motors which can move the male coupling elements against the opposition of stressed coil springs. The tips of the male coupling elements bear against the other section in operative positions of the male coupling elements to thereby urge an end face of the other section against an adjacent end face of the one section.

Abstract: A tool changeover holder for machine tools has a rotationally driven spindle and a replaceable tool head that can be fixed thereto. The rotationally driven spindle has on the tool side a central journal, a chucking devoce and an annular face that surrounds this concentrically. The tool head has a central drilling to accommodate the spindle journal and an annular matching surface that surrounds the drilling concentrically. The spindle face and the matching surfaces have inversely congruent centering and torque-transmitting means that engage in each other in the chucked position. Hirth serration elements are arranged on the face of the spindle in a plurality of annular-sector shaped serration sections that lie on an annulus that is concentric with the axis of the spindle. These are separated from each other by the flat contact surface sections.

Abstract: A retention knob for reversibly locking a tool holder to a locking device in which the shaft of the retention knob has a pair of opposed recesses separated by non-recessed portions to thereby provide a significantly stronger locking engagement between the tool holder and the locking device. Also disclosed are cutting tool assemblies employing the retention knob.

Abstract: Various clamping mechanisms are known for clamping shank-like tools such as drills, milling cutters and the like. The known clamping mechanisms often require long setting times involving long idle times when changing tools, particularly on machines with several spindles. The instant disclosure teaches a clamping mechanism allowing rapid tool change on the machine spindles and having good concentricity characteristics. A bayonet catch-like locking device is used for this purpose.

Abstract: A rotationally symmetrical tool assembly includes a first component constituted by a tool holder; a second component constituted by a tool head and being removably attached to the first component such that engagement faces of the first and second components are in a contacting relationship with one another and are oriented perpendicularly to the rotary axis of the tool assembly. A fitting bore is provided in one of the components and a guide bore is provided in the other of the components. A securing pin projects from the fitting bore and extends into the guide bore for determining and maintaining a desired angular position of the second component relative to the first component.

Abstract: An apparatus for receiving a tool carrier comprises a tool holder defining a receiving bore adapted to receive a portion of the tool carrier, an arrangement for supplying pressurized fluid to the receiving bore of the tool holder to clean adjacent surfaces of the tool holder and the tool carrier during insertion of the tool carrier into the receiving bore; and an arrangement for detecting the pressure of the fluid supplied to the tool holder for ascertaining whether correct operational positioning of the tool carrier exists with respect to the tool holder.

Abstract: A clamping device (5) is provided, which serves to fix a rotarty cutter (3, 3a) to a toolholder (2, 2a). The rotary cutter (3, 3a) has a planar radial contacting surface (15, 15a) for engaging a planar radial end face (16, 16a) of the toolholder. Load-applying means (7, 8a) are provided for forcing the rotary cutter by means of a conical interface (13) against the toolholder (2). In order to provide a simple clamping device by which the rotary cutter is secured to the toolholder exactly in a desired position, the load-applying means (7, 7a) engage clamping means (6, 6a), which define the conical interface (13) with the rotary cutter (3, 3a) and which are supported on the toolholder (2, 2a) at a cylinder interface (14) and are elastically deformed by the load-applying means.

Abstract: An apparatus to change and chuck a tool head incorporates a chucking system that is arranged in a recess in the drive spindle that chucks a tool-head shank that can be inserted into the accommodating opening. The chucking system incorporates a grip with an axially displaceable spreader and radial guide drillings that accommodate lock balls. The tool-head shank is configured as an annular cylinder and provided with an inside annular groove on the inclined groove side wall of which locking elements, that are arranged on the grip and can be forced apart in a radial direction, outside the lock balls on the grip, interact with corresponding locking surfaces both in the locking direction and in the direction of spread.

Abstract: A self-locking tool and socket body combination includes a tool holder with a male section which may be received in a socket in the socket body. Tool grippers of a tool loading device grip onto an annular V-groove on the tool holder and also act on an actuator. The actuator is linked to a first and second wedge surface which are moved laterally inwardly against the urging of spring means. When the tool grippers are released, the spring means urge the first and second wedge surfaces laterally outwardly into engagement with first and second wedge follower surfaces in the socket body and this automatically locks the tool holder axially within the socket body without any other manual or automatic means required to lock the tool holder within the socket.

Abstract: The present invention relates to mounting device having a conical spindle, especially with a 7/24ths cone, with conical and butt contact for attachments, tool holders and tools characterized in that it is essentially constituted by a cone (1) introducible into the spindle (2), by a forward part (3) centered in the cone (1) and provided with the collar (4) for application against the face of the spindle (2), by a pull rod (5) for assembling the cone (1) and the forward part (3), by a resilient assembly (6) for pressing the cone (1) into the spindle (3) in locking position, mounted in compression between the cone (1) and the forward part (3), and by structure (7) for adjusting said pressing assembly (6).

Abstract: A quick change spindle adaptor for a power driven spindle having an axial bore and a tool holder having a shank axially projected into the spindle. A sleeve is secured upon the spindle and an outer shell is rotatably mounted upon the sleeve and retained thereon and includes a nut. A conical recess within the inner bore surface at the forward end of the spindle defines an axial bearing and receives a centering cone on the tool holder for maintaining an axial self alignment of the tool holder and spindle. Spaced threaded segments upon the tool holder are threadedly engaged by the nut for axially anchoring the tool holder upon the spindle and for biasing the centering cone into engagement with the spindle bearing.

Abstract: A locking assembly for locking components of a machine tool together including a rotatable bar having wedges reversibly movable thereon for simultaneously engaging wedge receiving spaces of one of the tool components while a portion of the wedges are secured in corresponding space in another tool component to thereby provide full face to face interlocking engagement of the wedges and the tool components. Machine tool components interlocked with the locking assembly of the invention which may include a vibrational energy dissipating cavity are also disclosed.

Abstract: Where components are drilled by means of a robot a problem occurs when different size holes are needed to be drilled. The existing solution to this problem is to provide a drill unit (including drill bit, chuck and feed device) for each size of hole to be drilled and programme the robot to select the appropriate drill unit from the series of drill units supplied, perform its task, replace the drill unit in its store and select a further drill unit. Thus a complete drill unit is changed for every change in hole size. The presently described arrangement provides means to effect only drill bit change, the chuck and feed unit remaining on the robot at all times. The arrangement also provides means to effect such drill bit change while the chuck is rotating thereby obviating the need to stop and restart every time the drill bit is changed.

Abstract: A tool holder for a gun drill or reamer has internal and external cylindrical rear end pilot portions and a radial pilot flange for precisely connecting coaxially with a rotatable and axially moveable power source. A sleeve confined coaxially within the internal cylindrical portion has an axially extending flat spline surface for effecting driving engagement with a mating flat of a tool shank. A contractible conical split collet at the forward end of the holder coaxially clamps the tool shank when moved axially to a clamping position by means of a non-rotatable nut secured to the collet for cocking out of axial alignment therewith to assure precise coaxial clamping of the tool shaft. The nut is in screw threaded engagement with a rotatable and non-axially moveable collar provided with beveled gear teeth for rotation by a Jacobs type tool.

Abstract: A tooling assembly comprises a holder and a tool head releasably mounted thereon. The holder includes a forwardly projecting frusto-conical tongue which is tightly received within a correspondingly shaped socket of the tool holder. An actuator is slidably mounted within the holder and is retained within the tool head by means of a bayonet-type coupling. A pair of locking wedges is mounted in the holder and actuated by means of a differential screw to push the actuator rearwardly against a spring bias in a manner drawing the tool head tightly against the holder. Fluid channels in the holder body, actuator, and tool head communicate after the tool head has been mounted on the holder, in order to conduct flushing fluid to flush cuttings from the hole being cut.

Abstract: Described is a coupling system for cutting shank tools with which a stationary connection can be produced between coaxial parts of the shank tool in the direction of rotation and in the axial direction. The coupling system includes a holding fixture formed in a first part for a centering extension provided on a second part to be connected, a drive device, and a clamping device which can be actuated externally by an adjusting device and with which both parts can be pressed against each other through a prop ring surface pairing. The clamping device includes a connecting rod that is mounted symmetrically like a pendulum in the first part and that extends into a coaxial recess in the second part and forms a conical section there, through which the connecting rod can be placed under tension by the adjusting device braced on the second part. This generates pure axial tension which can be introduced, through a large, ring-shaped flat brace, without transverse force into the shank parts to be coupled.

Abstract: A multi-component chucking system, in particular for concentric or true-rotation tools, has a recieving body (1) optionally having a chucking shaft, with an engagement surface (8) extending at right angles to the axis of rotation (2) and a coaxial retention bore (7) as well as a tool element (9), preferably embodied as a tool holder. On its end face, the tool element also has an engagement surface (11) at right angles to the axis of rotation and is formed with a coaxial retention stub (10) fitting into the retention bore (7), by means of which stub the tool element can be centered with respect to the receiving body. A chucking pin (18) associated with the retention stub and coaxial with the axis of rotation, along with chucking means actuatable from outside the receiving body, allows the clamping together of the tool element and the receiving body.

Abstract: In a chuck for clamping a tool (1) into a carrier (2), a shank (3) is provided in the tool (1) and a mating bore (4) in the carrier (2). The shank (3) is insertable into the mating bore (4) and can be fixed there. To fix it, a locking element (7) is displaceably mounted in a radial transverse recess (6) of the shank (3) and its two front ends are provided with planar slopes (9, 10). Both slopes (9, 10) form an acute angle (11) which closes in the direction toward the tool (1). The chuck is tightened by means of pressure screws (15) which are screwed radially into an annular flange (12) of carrier (2) surrounding bore (4). The pressure element of the pressure screws (15) is a ball (14) having a truncation surface (13) which, when positioned in the same plane, charges the opposing slope (9, 10) of the locking element (7).

Abstract: A quick change tool holder having a cutting head on which a cutting member is attached for attachment to a shank. A lockpin/locknut arrangement provides for quick and safe removal of the cutting head from the shank. The lockpin has radial projections that rotate in response to manual rotation of the lockpin in and out of recesses contained in the opening of the locknut. The lockpin is secured within a bore in the cutting head and extends out of that bore into a bore in the shank in which bore the locknut is secured. A spring and plunger combination is located in the bore of the shank in order to urge the cutting head away from the shank when the radial projections are not within the recesses of the locknut. The shank and the cutting head have corresponding mating teeth in order to prevent rotation of the cutting head relative to the shank when the cutting head and shank are attached.

Abstract: A machine tool spindle (1) serving to receive toolholders (13) with different shanks (8, 16) by turns has a frustoconical receiving bore (3) in its head (1a) for receiving a steep-angle taper shank of a first toolholder. The spindle head (1a) is provided with an end face (4) surrounding the frustoconical receiving bore (3). Immediately adjoining this end face there is provided a first nesting bore (8) whose diameter (D) is slightly greater than the theoretical diameter of the frustoconical receiving bore (3) in the plane of the end face (4). The axial length of the nesting bore (8) is only about 10-15% of the theoretical diameter. The nesting bore (8) serves to receive a first cylindrical nesting shoulder (15) of the second toolholder (13). At the inner end of the receiving bore (3) there is provided a second nesting bore (40) into which a second nesting shoulder (41) is arranged at that end of the toolholder (13) which is located in the spindle fits.