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 tool-and-tool holder assembly includes a tool having a tool shank; a tool holder having a receiving bore arranged for accommodating a stub of the tool shank; a clamping member disposed in the stub and being movable therein, generally perpendicularly to the shank; and two clamping screws supported in the tool holder and cooperating with the clamping member for axially tightening the shank against the tool holder. Each clamping screw has a first conical face and the clamping member has recesses each bounded by a second conical face. Upon tightening the clamping screws, the respective first and second conical faces are pressed against one another for generating an axial force component urging the shank into the receiving bore. At least one of the clamping screws has a third conical face, and the clamping member has a portion projecting over one of the recesses and having a fourth conical face.

Abstract: A rapid securement device for a tool or workpiece holder, comprising an elongated stem, and an elongated axle extending through the stem for axial movement relative to the stem. The stem has a head thereon, the head having a hole therethrough that registers with holes through the stem. A peg for holding a tool or a workpiece holder extends through the holes and has a flat surface that engages with a flat surface on the head. A spring urges the axle in a direction relative to the stem to engage the flat surfaces forcibly together thereby releasably to retain the peg in the holes.

Abstract: The present invention concerns an apparatus for locking and/or gripping modular attachments of boring heads, boring bars, intermediate members, adapters, tool holders, hydraulic punches, long tongs, or other mechanical members. The apparatus comprises one or several fastening elements (1) disposed at regular intervals over the diameter of the drive shaft (2) at a given distance from the surface of application (3) of the part to be driven or adapter (4) cooperating with the fastening elements (1). The fastening elements (1) are hemispherical headed screws, and seats (5) provided on the part to be driven or adapted (4) having a hemispherical section of greater radius than that of the screws. Driving in rotation of the drive shaft has for effect an auto-gripping of the surface (3) of the part to be driven against the application surface (6) of the drive shaft (2).

Abstract: An elongated grooving or threading tool has a cutting section and a rearward cemented carbide section which are, respectively, held together in axial alignment by a threaded fastener and a drawbolt which engage the intermediate section and hold the respective connections under compression.

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: Quick change attachment for clamping chucks on a machine spindle in which a locking bush (32) is actuated by an axially shiftable locking piston for actuating the chuck clamping, while an adjusting rod (44) adjustable from the clamping cylinder is provided for actuating the clamping jaws of the chuck. Axially secured at the end of the adjusting rod to connect the clamping piston rod with the adjusting rod (44) are coupling pieces (50) which execute plier-like gripping and expanding movements by means of a tipping edge and are actuated from a control bush 58 overlapping them together with the locking bars for the chuck clamping driven by the locking bush (32).

Abstract: The adaptor is to enable a cutting tool holder such as a boring bar to be mounted on a standard arbor having an internally screw-threaded boss and drive keys. The adaptor comprises a thrust ring, a retaining screw and a spacer. The thrust ring has a multiplicity of internally tapered recesses in its peripheral surface and is rotatably mounted on the arbor by the retaining screw. Rotation of the thrust ring is permitted to enable alignment of a respective recess with a respective locking screw in the cutting tool holder.

Abstract: An improved high-speed spindle assembly for a shank-driven cutting tool comprises a hollow spindle for a collet, a titanium alloy drawbar within the spindle for threadingly engaging the collet, and a tubular resilient member within the spindle surrounding the drawbar for damping vibrations. A transverse resilient member in a threaded portion of the collet resists rotation of the collet on the drawbar. A ten-tooth involute spline provides precise sliding engagement of the drawbar within the spindle. A pair of ball bearings are axially clamped to the spindle by a pair of titanium nuts, a lower nut having a flange closely spaced from an external annular surface of a spindle housing for excluding foreign matter, an upper nut having a cavity for axially retaining a flange of the drawbar.

Abstract: The apparatus is intended for securing a tool (3) in a holder (1), of which one (1) having a hole (2) and the other (3) having a stem (4) fitted in the hole (2), the stem surface being provided with a groove (7) having side surfaces (8, 9). The apparatus comprises a pin (10). The hole (2) and the stem (4) have bearing surfaces (12, 13). The minimum distance (1) from the bearing surface (13) of the stem (4) to the side surface (8) of the groove (7) farthest therefrom is less than the distance (L) from the bearing surface (12) of the hole (2) to the surface of the pin (10) farthest from said bearing surface (12) of the hole (2).

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: To be able, in a machine for machining workpieces and showing a spindle with spindle draw bar, to use an arm (10) with a draw bar pin (2) in a machining device for several working operations or separate tool holders (3) or different types of tools, the draw bar pin (2) is arranged in one piece with or in communication with a tool element (4) including in the arm (10). The tool element is shaped to hold tools or the tool holder (3). The draw bar pin (2) and tool element (4) plus eventual existing connecting elements (5, 12, 13) between the draw bar pin and the tool element are arranged displaceable in the arm (10), whereby the draw bar force of the machine's spindle draw bar is utilized to retain the tools or tool holder in the arm.

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: 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 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: A clamping device for workpieces or tools with a high concentricity utilizes a shank part supported in a cylindrical borehole of a base body, and an adjusting device disposed in the support area of the shank part includes several tapped holes, especially tapered tapped holes in the base body, which are distributed in a radial plane, as well as tapered bolts which can be screwed into the tapped holes.

Abstract: A compact tap wrench includes a ring-base, a pair of diametrically opposed handles, and a chuck mechanism friction-fit into the ring-base. A ratchet mechanism is built into one of the handles. The chuck mechanism includes interchangeable jaws for accommodating different ranges of tap sizes.

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: An improved quick release chuck mechanism is disclosed mountable on a spindle for releasably holding a tool or the like. The chuck mechanism comprises a body member having an end surface. A tool insert having a shoulder is supported by the body member. The end surface is provided with an adjustment for varying the position of the end surface for achieving a predetermined end surface position while mounted on the spindle. The tool insert is releasably held in the body member by an improved locking mechanism that positively forces the shoulder into engagement with the end surface. The improved chuck mechanisms, when mounted on multiple head spindles, provide a method for compensating for tolerance differences that exist between the spindles to achieve identical predetermined end surface positions for the spindles.

Abstract: A tool-mounting assembly includes a tool head having a receiving bore and a basic tool holder having a receiving pin that is shaped for insertion into the bore. The bore has a groove with a sloping surface and the receiving pin includes movably mounted clamping elements having lugs. The assembly also includes a clamping device in the form of a screw with left-handed threads that engage one clamping element and right-handed threads that engage the other, so that the clamping elements can be moved away from each other to force the lugs into the groove and thereby clamp the tool head to the basic tool holder. In another embodiment an axially movable push rod is used as the clamping device to force the clamping elements away from each other.

Abstract: In a hand-held tool, such as a power drill, a hammer drill, a powered screwdriver or the like, a chuck is secured on one end of an axially extending rotary spindle by ball-shaped locking members. The chuck has a driver socket which fits on one end of the rotary spindle. The locking members are located within openings in the driver socket and are displaced radially inwardly into recesses in the spindle by a support ring encircling the driver socket. Recesses in the spindle, in which the locking members are held, have a first surface extending transversely of the axial direction of the spindle with the first surface forming a pair of run-up ramp surfaces, each inclined to the axis of the spindle and relative to one another. Due to the rotation of the spindle, the locking members move along one of the run-up ramp surfaces within each recess and develop a force component in the axial direction of the spindle, pressing abutment surfaces of the spindle and the driver socket into contact with one another.

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.

Abstract: A tool-holder has a frustoconical outer centering surface which fits over a matching surface of a spindle. At the rearward end of the former surface are two axial slots and two circumferential grooves. Each of the slots receives a key borne by two spring-rings fitted in the grooves. The keys therefore rotate together with the tool-holder but are radially movable so that they can yield when the tool-holder is put in place if they come up against ribs forming part of the coupling components of the spindle.

Abstract: The collet includes a compressible basket having a central opening to receive a tool shank and two exterior surfaces tapering in opposite directions. One tapered exterior surface engages a matching tapered interior surface of a hollow rotatable shaft that receives it. The other tapered exterior surface engages a matching tapered interior surface of a wedge received in the shaft and movable axially relative to it. The angles of the tapers are such that they are self holding. The collet is closed by moving the wedge which compresses the basket sequentially at the two tapered surfaces, locking the tapers. The force on the wedge is released after this, leaving the tapers locked without external force as the tool is gripped in two locations during operation of it.

Abstract: An arrangement for torque transmitting to impacting and/or drilling tool has a chuck provided with clamping jaws which in the region of their contact with a tool shaft have a toothing including a plurality of teeth which extend parallel to an axis of the chuck and engage with a toothed portion of the shaft end.

Abstract: A thread cutting diestock assembly is disclosed comprising a ratchet housing having a bore adapted to selectively and detachably receive a large thread cutting die head or an adaptor ring, each of which is provided with ratchet teeth engaged by a pawl on the ratchet housing so as to be rotatably therewith. The adaptor ring has a polygonal bore adapted to detachably receive a small thread cutting die head which interengages with the polygonal bore to preclude relative rotation between the die head and adaptor ring. A circumferentially extending recess in the bore in the ratchet housing carriers a non-circular split retaining spring ring which interengages with the large die head or adaptor ring to detachably secure the latter in the ratchet housing bore, and a circumferentially extending groove in the adaptor ring bore carries a polygonal split retaining spring ring which interengages with the smaller die head to detachably secure the latter in the adaptor ring bore.

Abstract: A collet attachment and release mechanism for a vertical milling machine includes a movable plate vertically supporting a pneumatic, hand-held, bidirectional, rotary impact wrench above the drive head of a drawbar. The movable plate is spring-biased to keep the socket of the impact wrench out of engagement with the drive head and is manually movable vertically along parallel guide posts by means of a handle. The handle is rotatable about one of the posts to actuate a pivotally mounted switch plate on the impact wrench for rotating the socket in a counter-clockwise or clockwise direction. The mechanism may also be used as a hammer to impart a sharp blow to the drive head to free a collet that sticks in the spindle.

Abstract: Quick change chuck systems with integral fluid inducer. A quick change drill bushing system reduces misalignment of bushing to motor spindles and enables rapid change of cutting tools and bushing thereby reducing the number of dedicated working systems. The quick change chuck system with integral fluid inducer may utilize a quick change nosepiece system in combination.

Abstract: The present invention relates to an improved toolholder for releasably mounting on a tool support member. The toolholder is provided with a forward end for receiving a tool and a shank extending from the forward end for being releasably received in a bore of a tool support member. The shank has a first section for interference fitting with the bore of the tool support member when a rearwardly facing face on the toolholder is in abutment with a forwardly facing surface on the tool support member. The shank has a second section, rearwardly of its first section, for expansible abutment with the bore of the tool support member.

Abstract: A spindle of a machine tool is mounted for rotation about a longitudinal axis. The spindle comprises clamping means for clamping and releasing a tool. An energy accumulator is charged when the tool is not clamped and is at least partly discharged to tighten the clamping means when the tool is clamped. An actuating unit serves to charge the energy accumulator by means of an external force supplied via a connection. To enable employment of the spindle at very high speeds, the actuating unit and the connection are arranged in the rotating part of the spindle. The spindle rotates at at least 30,000 revolutions per minute and the connection is a releasable plug or screw connection.

Abstract: A tool holder in a machining center comprising a basic tool holder provided with a tapered fitting hole formed on the nose portion and a small tool having its tapered fitting portion fitted detachably in the tapered fitting hole, wherein a plurality of guide holes for protruding a locking ball are formed on a circumferential wall of the fitting hole, a recess for receiving the locking ball therein is provided on a nose outer peripheral surface of the basic tool holder on which the fitting hole is formed, and a piston actuated at all times toward a base end portion of the basic tool holder is provided slidably and wherein release means for releasing the small tool from being locked by shifting the piston toward a nose of the basic tool holder is provided between the piston and the basic tool holder, a pressure chamber is formed further between the piston and the basic tool holder, and a high-pressure air from a fluid pressure source is connected to each discharge port in the pressure chamber and the fitting ho

Abstract: Quick change chuck systems with integral fluid inducer. A quick change drill bushing system reduces misalignment of bushing to motor spindles and enables rapid change of cutting tools and bushing thereby reducing the number of dedicated working systems. The quick change chuck system with integral fluid inducer may utilize a quick change nosepiece system in combination.

Abstract: For the attachment of a tool provided with a cylindrical or frusto-conical shank to a rotating machine spindle at one end of the machine spindle a complementary reception opening for the shank is provided. The shank contains a coaxial bore and a plurality of slots distributed in the circumferential direction and extending through radially to the bore, which divide the shank within the reception opening into segments. In the region of the slots the shank widens out under the influence of centrifugal forces more than does the region of the spindle surrounding the shank. Thus the radial guidance of the tool is not lost even at very high rotation rates of 10,000 r.p.m. and above. A support shoulder on an annular collar of the tool prevents axial reshifting of the shank by reason of the axial stress of a clamping device and improves the rigidity of the tool-spindle connection. The bore extends through the annular collar.

Abstract: The cutting tool comprises a cutting head and a holding shank and, for transferring the torque introduced on the cutting head during machining, faces are provided in a recess of the bearing surface of the holding shank on which engage the stop faces of the cutting head. A fixed connection between the cutting head and the holding shank is brought about by a threaded pin screwed into a tapped hole on the holding shank and which projects into a conical blind hole on the cutting head. As the torque is transferred in the vicinity of the bearing surface, the threaded pin is only loaded to the extent that there is a clearance-free connection between the cutting head and the holding shank.

Abstract: The mounting body (1) of the boring tool, which is of a hub-like configuration, is provided, at locations which are diametrally oppositely disposed with respect to the axis of rotation (D) of the mounting body, with a respective mounting bore (3) with its axis (A) extending radially with respect to the axis of rotation (D), the mounting bore being surrounded by a respective abutment surface (4) extending perpendicularly with respect to the axis (A) of the mounting bore (3). A tool head (5) is provided with a fitting spigot (6) which fits into the mounting bore (3) and which is concentrically surrounded by an annular surface (7) extending perpendicularly with respect to the axis (A) of the fitting spigot. A respective intermediate portion can optionally be fitted between the mounting body (1) and the respective tool head (5), the connecting parts of the intermediate portion corresponding to those of the mounting body (1) and the tool head (5).

Abstract: Apparatus for adapting a high speed, drill press type tapping head for use with a CNC vertical milling machine and specifically to a three-piece apparatus that will maintain proper rotation-free alignment of the tapping head housing in both the movable automatic tool rack and in the spindle of the mill. A forked flange secured to the tapping head housing engages a vertically depending shaft attached to a vertically movable, non-rotating part of the mill to prevent rotation of the housing when the tap is rotated by the mill. The opposite side of the tapping head housing supports a short horizontal shaft that engages depending forks on a member attached to the assigned location of the tapping head in the movable tool rack.

Abstract: A locking tool holder is disclosed which has a socket adapted to receive a tool which has a lateral recess. The tool holder contains a lock pin which is slidable in a first aperture transverse to the tool socket, and this lock pin has a wedge portion on the inboard end thereof to engage a tapered lateral recess on the tool. A cam bar is slidable transversely to the lock pin in another aperture in the tool holder, and has first and second cam surfaces to cooperate with first and second cam followers on the lock pin. The cam bar may be moved manually or by a spring into a first locked position, whereat the second cam engages the second cam follower on the lock pin to force the lock pin wedge portion against the lateral recess in the tool. When the cam bar is moved into the second position, the first cam surface engages the first cam follower on the lock pin to withdraw the lock pin from the tool so that the tool may be removed from the tool socket.

Abstract: The subject matter of the invention is a tool-clamping device, more particularly for milling and drilling machines, consisting of a clamping arrangement (5) with clamping tongues (6), arranged centrally and longitudinally displaceably in the tool spindle (2), of a rotational position indicator for presetting the clamping jaws into their tool-change position, and of a positioning mechanism (11, 15) for finely adjusting and fixing the tool spindle (2) in the tool-change position. In order to achieve automatic positioning of the tool spindle (2) in its tool-change position after presetting by means of the rotational position indicator, the positioning device has a cross pin (11) which is secured to the clamping arrangement (5), projects through an elongated axial hole (13) in the tool spindle (2), and is guided between two guide surfaces of a guide member (15) on longitudinal movement of the clamping arrangement (5).

Abstract: A precision hand-driven tapping system for use with an inert rotating-spindle machine which is employed for stability and guidance, comprising a wrench body, guide means and non-integral tap adapter and is secured within said machine by its chuck, collett or clamping device. The wrench body has thereon, and out of the tap line-of-sight, handles spaced 120.degree. apart, or a wheel-like device, for applying hand force to rotate the body. A series of tap-holding adapters are used to secure various sized taps by their shanks. Adapters are press-fitted into the wrench body. A machine clamping device holds the system guide means which, in turn, allows the adapter and tap holding body of the wrench to be manually advanced toward a work piece, manually operated to tap it, and to subsequently be retracted and removably secured at the machine clamping device without the machinist removing his or her hands from the wrench.

Abstract: The power tool has a magnetic base with superposed permanent magnet assemblies. The upper assembly can be moved relative to the lower assembly to subtract from or reinforce the magnetic field. When the sensing probe is pushed into the base the electric motor can be switched on to rotate a spindle on which a rotary cutting tool is axially mounted. The tool feed is controlled by a handle which can be mounted on either side of the tool housing. A coolant reservoir on the base has a hose connected to a pump which is connected to a manifold supplying coolant to the center of the cutting tool. The cutting tool is biased upwardly and pinches off the coolant when the tool is raised from the work. The tubular tool shank is retained on the drive spindle by balls carried by a cage and moved into engagement with a groove in the tool shank by a cam surface on a release collar spring biased to move the balls to engage the tool.

Abstract: The invention relates to a drill for metal drilling, comprising a drill body and a drill tip provided with cutting portions. The drill tip is detachably secured to the drill body by means of fastening devices, which are arranged on opposite sides of the centerline (CL) of the drill. The planar lower face of the drill tip is provided with a central tap which engages in a central recess in the mainly planar front surface of the drill body in order to center the drill tip relative to the drill body. A central fluid passage is formed in the drill body, which transforms into eccentrically arranged fluid passages in the drill tip. The fastening devices form at least partly walls in the eccentrical fluid passages.

Abstract: A machine tool spindle, which serves for interchangeably receiving tool holders (13) having different shanks (8,16), has in the spindle head (1a) thereof a frusto-conical receiving bore (3) for the reception of a steeply tapered conical shank of a first tool holder. The spindle head (1a) is provided with an end surface (4) which surrounds the frusto-conical receiving bore (3). Immediately adjacent this end surface there is provided a mating bore (8), the diameter (D) of which is slightly greater than the theoretical diameter of the frusto-conical receiving bore (3) in the plane of the end surface (4). The axial length of the mating bore (8) is equal to about 10 to 15% of the theoretical diameter. The mating bore (8) serves for the reception of a cylindrical mating extension (15) of the second tool holder (13).

Abstract: The disclosure is of a spreadable keeper for use in the cooperative slots in a machine tool spindle and its associated shank or tang. In use, the slots are partly aligned crosswise of the spindle axis of rotation and the keeper is inserted in the slots and screw-expanded to force the tang or shank more tightly into the tapered bore of the spindle. The keeper comprises a base on which are mounted cooperative camming members operable by a screw to expand lengthwise of the spindle for exporting the tightening force.

Abstract: The machine tool spindle has a cylindrical receiving bore (3) and on its front end a plurality of concentric, annular supporting surfaces (4, 5, 6) which are separated from one another by annular grooves (7, 8) formed in the front end. The tool holders (9a) have mating projections (10) of equal diameter which fit accurately in the receiving bore (3) but shank diameters (D3) which differ stepwise from one another, the outside diameter (d1, d2, d3) of each supporting surface (4, 5, 6) being slightly smaller than the outside diameter (D3) of the annular surface (12a) of the corresponding tool holder (9a). When the annular surface (12a) (of a tool holder 9a), which is located at the transition between the shank and the mating projection (10), is in contact with the corresponding supporting surface (4, 5, 6), the or each further radially inwardly located supporting surface is located in axially spaced relationship to the opposite radial surface of the tool holder (9a).

Abstract: A reversible drill and drive tool for performing a series of similar drill and drive operations. The tool consists of an elongated cylindrical housing having at its rear end a shaft of reduced diameter for insertion into the chuck of a power drill and a front and bifurcated to form two arms with parallel flat interior surfaces and a generally cylindrical tool-holding member having at each end an axially recessed cylindrical socket of reduced diameter adapted to receive a drilling tool at one end and a driving tool at its other end. Each arm of the housing contains an identical elongated slot running parallel to the axis of the housing, and the tool-holding member being slidably and pivotably pinned into the housing by a pin whose outer ends lie within the elongated slots in the arms of the housing. The tool-holding member also has a pair of identical and parallel flat sides which lie parallel to the flat interior surfaces of the arms of the housing and the housing has a third elongated slot which lies at 90.

Abstract: A chuck for a cylindrical, rotary, metal cutting tool, such as an end mill, is provided with a liquid coolant system. The chuck has a stationary, annular collar within which a tool holder rotates at high speed. An annular channel is defined between the collar and the tool holder and liquid coolant is pumped into the collar to the channel through an inlet on the collar. Internal ducts within the tool holder are directed inwardly at an angle from the annular channel toward an end face from which a rotary tool, such as an end mill protrudes. The ducts are also oriented at an angle corresponding to the helical spiral of flutes on the end mill and are radially aligned with troughs between the flutes. Liquid coolant, such as water, is forced from the annular channel through the ducts toward the troughs between the flutes. The liquid coolant travels all the way to the tip of the end mill to cool the bit and wash chips of metal therefrom with a minimum of water being thrown from the end mill by centrifugal force.

Abstract: A keyless tool chuck is disclosed which may be used with most power tools having standard chucks. The jaws of the chuck are displaced and retracted by controlling the rotation of a threaded collar which surrounds the jaws relative to the rotation of the tool shaft and the jaws. This rotation is controlled by displacing a plate so as to control rotation of the collar in a first embodiment. In a second embodiment, rotation of the chuck collar is controlled by a clutch means, and in a third embodiment the rotation of the chuck collar is controlled relative to the jaws by means of vanes which are inserted into a grooved cylinder attached to the chuck collar.

Abstract: This invention is characterized by that the high-frequency motor is adapted to provide the tapered surface engagements in both engaging parts between a draw bar set in a rotary shaft of the motor and a slit hook engaged with the draw bar, and between this hook and a holder for the hook, and to reverse mutually the inclined directions of these tapered surfaces so as to obtain a large clamp force.

Abstract: Disclosed is an improved core drill and a method of detachably coupling the same to a power driving unit to expedite the removal of a core therefrom. This is achieved by equipping the rear end of the drill stem with a fixedly attached externally threaded bushing. A coupling sleeve has internal threads at either end matable respectively with the bushing threads and the threaded drive shank of a power driving unit. This sleeve and the core drill are readily detached as a unit from the power drive thereby permitting the rapid removal of the core from the rear end of the drill rather than past the cutting ring at its front end.

Abstract: A holder for a cutting tool has a main spindle formed with a bore to receive the cutting tool, a casing mounted on the main spindle, and an oil receiver stand secured to the casing. The main spindle, casing and receiver stand are each formed with an oil passage communicating with one another to feed cutting fluid to the cutting tool. The holder is characterized in that an intersifier for increasing the feed pressure of the cutting fluid is provided in an annular chamber provided around the main spindle in the oil passage to the cutting tool.