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and on the clamping bolts on the other for the radial adjustment of the clamping bolts (26) between a release position withdrawn in the fitting pin (18) and a clamping position shifted radially outwards.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: A connection system for connecting an interchangeable tool head to the spindle of a numerically controlled machine includes radially displaceable wedge members which when actuated radially to an outer clamping position provide for a clamping connection between the spindle and the tool head. When actuated to an inner release position the system allows for withdrawal of the tool head from the spindle. The wedge members are displaced by a central actuating rod connected to the wedge members via cam means such that the wedge members are positively driven by the cam means in both radial directions of movement.

Abstract: The present invention relates to a multi-functional drill and lock assembly comprising a drill cylinder, a drill pillar and a drill head. A convex tenon at the front end of the drill pillar is adapted to pierce through and sleeve with a guiding groove formed in the lock cylinder. By adjusting the position of the tenon within the guiding groove, a drill head secured to the front end of the drill pillar can be shifted so as to extend beyond or retract within the lock cylinder. The front end of the drill cylinder is formed with a screw locking hole to enable the tool to perform a dual-function. The drill head is removably secured to the drill pillar by a steel shot extending from the lock cylinder, through the drill pillar and into a shot groove formed as part of the drill head.

Abstract: An exchangeable-size tool system uses a tool holder which can reside in a drive motor chuck. Each of the various sizes or type of tool has the same shank size for mounting within the holder. A given tool size is popped into the holder. It is removed by manually pressing a small locking pin on the side of the holder and then pulling out the shank. The important features of the system are the ease of manufacturing and the precision of the holding of the tool.

Abstract: A drilling and chipping tool (1) has a holder (3) detachably connectable on a neck (2) on the tool (1) and the holder (3) includes a cap (4) arranged to fit over the neck (2). The tool (1) has a long direction and the cap (4) has teeth (5, 5a) on an interior surface detachably engageable with teeth (2a) on an exterior surface of the neck (2). A part (5a) of the interior teeth (5, 5a) on the cap (4) is offsettable relative to the remaining teeth (5) on the cap (4) and is engageable into at least one recess (2b) in the region of the teeth (2a) on the neck, whereby a tolerance free connection is established between the holder (3) and the neck (2) of the tool (1). The holder (3) can be attached and detached from the neck (2) without the use of any other tools.

Abstract: A shank (10) for retaining a tool or touch probe in the socket (S) of a machine tool spindle comprises 6 areas of surface which, in use, bear against the wall of the socket (S). The areas of surface are provided by three balls (34) resiliently supported for movement radial to a shank axis (A) on small flange section (26) (FIG. 2 ) at one end of the shank (10), and three further balls (36) embedded in the other end of the shank (10). As the shank is drawn into the socket (S) the small flange sections (26) deform allowing the balls (34) to move radially inward until the surface of balls (36) engage the wall of the socket (S). A pull-up stud (38), supported on a frusto-conical block (40) is connected to the shank by a plunger (42) and compression spring (46). Retraction of the shank into the socket by pull-up stud (38) against the resilience of the small flange sections (26), causes the plunger ( 42) to compress spring (46) until the block (40) bears firmly against the wall of the socket (S).

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: A hand held power tool has a rotatable spindle, a tool holder arranged on the spindle, a tool inserted in the tool holder, locking members fixing the tool holder with the spindle and engaging both in the tool holder and the spindle, a rotatable ring holding the locking members in its locking position and provided with depressions for receiving the locking members not locking position, and a gripping sleeve connected with the ring and operating simultaneously as an actuating member for unlocking the tool inserted in the tool holder.

Abstract: A mechanism for clamping a cutting tool holder in a socket formed in an end face of a clamping unit in a cutting machine. An axially movable drawbar has a multiple number of flat surfaces obliquely angled to the drawbar axis for exerting cam forces on individual wedge elements that are slidably guided for outward movement into wedge lock engagements with an inturned flange on the tool holder. The wedge elements exert axial forces on the tool holder internal flange for simultaneously achieving a relatively tight fit of the tool holder in the associated socket and a seating of the tool holder against an end face of the clamping unit. The mechanism can be used in rotary or non-rotary machines.

Abstract: The quick-fastening device comprises only two parts separable during the fitting and removal of the bit, the first part being fixed to the tool and the second part being fixed to a motor-drive body. The axial locking and the rotational locking are ensured respectively by screwing and the engagement of two profiled ends of matching profiles.

Abstract: A retractable tool bit assembly for a tool such as an allen key. The assembly includes one or more spring loaded nestable or telescoping tubular sections together with a catch mechanism for capturing and holding the tool in its retracted position. The catch mechanism consists of a latch mechanism located in a base section and which engages a conically shaped tool head located at the inner end of the tool. The tool head adjoins an eccentric oval type neck portion which extends to a rear lip of the tool head. The latch mechanism releases when the ovular neck portion rotates about the catch members upon actuation of a rotary tool drive motor. When released, all the telescoping sections and the tool extends fully outward to a use position.

Abstract: A motor-operated tool is provided for tool sockets revolving about an axis, in particular for drills or spanners. The tool comprises a tool head containing a drive spindle. The drive spindle comprises a driving opening for a drive shank of the tool socket and a plurality of ball elements for engaging a part of the drive shank to lock it in the driving opening. The ball elements preferably are adapted to lock the drive shank in the driving opening automatically and to be released by a suitable mechanism. The tool socket is designed as a drill chuck and is provided with key elements for actuating the mechanism.

Abstract: A retractable tool bit assembly utilized in conenction with a robotic gripper type and end-effector. The apparatus includes one or more spring loaded nestable or telescoping tubular sections together with a catch mechanism for capturing and holding the tool, such as an allen key, in its retracted position. The innermost tubular section includes a threshold cap and engages and holds the tool. The catch mechanism consists of a slider type mechanism located adjacent a relatively larger outer base sction and includes means for engaging a conically or mushroom shaped rear end portion of the tool when the telescoping sections are moved to a retracted or parked position. The catch mechanism is released upon actuation of a rotary tool drive motor coupled to a circular mount and which holds the base section. When released all the telescoping sections including the tool extends fully outward to a use position.

Abstract: Disclosed is an improved tool mount for a machining apparatus comprising essentially a tool holder cubic and an adapter to be detachably attached to the tool holder cubic. The tool holder cubic has a center guide projection, a notched cylindrical rod rotatably fitted in a semicircular hole of the center guide projection, and means for rotating the notched cylindrical rod. The adapter has a center slot to accept the center guide projection of the tool holder cubic, a semicircular recess made so as to allow the notched cylindrical rod to enter when it turns; and means for rotating the notched cylindrical rod to enter the semicircular recess, thereby allowing the adapter and the tool holder cubic to nest together. This arrangement permits easy and quick changing of different tools in a machining apparatus, and automatization of tool exchanging.

Abstract: The present invention is a tool holder which permits lateral insertion and removal of a tool means into and from the holder thereby making it unnecessary to move the machine or work piece to provide excess clearance. The tool holder includes a main body having a shallow tool cavity formed in one end thereof for receiving the tool means. A locking element having a u-shaped collar is rotatably mounted to the main body for clamping the tool means within the tool cavity. The u-shaped collar defines a tool slot having a tool slot opening which extends from the side of the locking element. When the locking element is in an unlocked position, the tool slot opening aligns radially with the open side of the tool cavity to permit lateral insertion and removal of the tool means into and from the cavity. When the locking element is rotated to the locked position, tool slot opening is moved out of alignment with the open side of the cavity thereby preventing removal of the to tool means.

Abstract: The reamer having an interchangeable cutter head and a coolant-lubricant feed (24, 25, 26, 27) supplying the cutter head from outside includes a coaxial opening (2) for receiving the cutter head, which is cylindrical. The end of the coaxial opening nearest the reamer shank (1) is provided with an outwardly opening first cone (13), the conical surface of which is provided with deepened portions (14) at three locations. The cutter-head shank (4) is cylindrical and insertable in the coaxial opening of the reamer shank until a thickening forming a second cone (12) rests against the first cone of the reamer shank. By means of a clamping bolt (8) passing through the cutter head, the second cone can be pressed into the first cone, which becomes deformed. This deformation also affects the wall of the reamer shank in the front region of the coaxial opening, whereby the cutter-head shank is likewise held. The clamping bolt can additionally be used for expanding the cutter head.

Abstract: A chuck for chucking predominantly chip-removing tools, such as milling cutters, drills, countersinks or the like which have a cylindrical shaft and a recessed drive surface on the shaft with stop shoulders in axial direction. A stop member inserted in a duct of the front portion of the chuck engages the stop surface, so that the chucking force acting on the tool shaft extends in axial direction and the chucking force is transmitted between the tool shaft and the front portion of the chuck by the locking member.

Abstract: A coupling for a detachable, torsionally and axially rigid fixing of parts, in particular of tool components, at corresponding carrier members, such as a tool base receiver or basic holder. At the carrier member a receiver for a conical or cylindrical centering extension of the part is provided. A chuck member can be actuated by a set screw from the exterior of the part so as to force the two members against each other through a support ring surface pairing. In order to provide an easy handling, a favorable application of force between the parts and compatibility with already existing coupling systems having a centrally disposed drawbar, the chuck member includes three clamp-like chuck claws positioned a circumferential distance with respect to each other which are disposed or arranged each in an axial plane of the coupling. The chuck claws are supported by an anchor portion at a shoulder in the receiver and are movable into an undercut interior recess with a radially outwardly projecting clamping portion.

Abstract: A coupling system for selectively locking a tool to a toolholder, in which the locking mechanism carried by the toolholder has a cross-sectionally compact structure and provides release assist when the tool is being removed from the toolholder. The body of the toolholder has an axial drawbar bore in which a drawbar selectively slides. The forward end of the drawbar bore in combination with the forward end of the drawbar form a tool profile cavity which is contoured to seatably receive a tool profile of the tool. The drawbar is hollow and is provided with a pair of apertures. The locking mechanism within the drawbar comprises a pair of locking fingers which are pivotally mounted on a common pivot pin connected with the body. Each locking finger may rotate so as to be retracted within the drawbar or erupt out of the apertures in the drawbar. Rotation of the locking fingers is effected by interaction between the apertures and the locking fingers as the drawbar is axially moved in the drawbar bore.

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: A rotary tool is provided with a shank and a collar-like section, and further includes a plurality of screw-threaded holes drilled in a vertical end face of the collar-like section, in parallel relationships with the axis of the collar-like section. A plurality of balancing weights are removably screwed in the holes as required to balance the tool.

Abstract: A tool driving unit for moving a tool in axial direction thereof and for rotating the tool about its axis. The tool driving unit comprises a spindle supported in the housing frame, a tool chuck mounted on the one end portion of the spindle for holding the tool, a first motor including a first hollow rotor and for rotating the spindle, a second motor including a second hollow rotor and for moving the spindle in the axial direction, means for transmitting a rotation of the first hollow rotor to the spindle, and means for converting a rotation of the second hollow rotor into axial movement of the spindle. The first rotor is rotated to rotate the spindle which corotatably engages the first rotor through the transmitting means. The second rotor is rotated, and the spindle is smoothly moved axially forwardly or rearwardly by the converting means which converts rotary motion of the second rotor to axial motion of the spindle.

Abstract: A balanceable tool holder for machine tools includes a main body with a holding cylinder. In addition, a flange encircles the main body. A plurality of screw holes extend longitudinally in the main body in which adjusting screws are moveable inwardly and outwardly for adjusting the balance of the tool holder.

Abstract: A spindle and Z-axis unit comprises a spindle housing and a hollow rotor shaft rotatable and axially movable with respect to the spindle housing. The rotor shaft carries a collet at its lower end for chucking a machine tool such as a drill bit. The tool is changed in the collet by pneumatic actuation of a diaphragm which actuates a push rod within the rotor shaft to move the collect axially against a spring bias to clamp and unclamp the tool. The shaft is moved in the Z-direction along with a thrust bearing assembly by a screw nut which actuates a road to move the rotor shaft in the Z-direction to drill a workpiece after a pressure foot has first been moved to clamp the workpiece with respect to the spindle. Thus, the moving weight or mass previously attributable to parts such as a spindle saddle and spindle housing can be eliminated without impairing the reliability and chucking force of the collet mechanism.

Abstract: A tool holder including a drive unit having a peripheral flange about the outer end thereof, and interchangeable chuck units with similarly configured flanges for selective engagement against and releasably mounting to the drive unit flange by screw fasteners. Each chuck unit includes a self-contained fluid pressure system comprising a recess inward through the outer end thereof defined by a flexible peripheral wall with a sealed cavity therebehind. The cavity is filled with a fluid which, upon being pressurized, produces a corresponding inward flexing of the recess wall for the gripping of a tool bit.

Abstract: Adapter structure for and method of securing a draw bar actuated tool to a spindle having an actuating draw bar extending therethrough. The structure includes coupling members for securing the adapter structure to the actuating draw bar and to the tool draw bar and structure permitting relative rotation between the tool and spindle with the actuating draw bar and tool draw bar securely engaged. In one embodiment, the adapter structure is entirely separate from the tool while in another embodiment, the adapter structure includes a modified tool and tool draw bar.The method of the invention includes the steps of securing a tool including a tool draw bar therein to an actuating draw bar extending through a spindle, rotating the tool and tool draw bar with respect to the actuating draw bar to align securing means on the spindle and tool without relative axial movement between the draw bars and subsequently securing the tool to the spindle.

Abstract: An improved manual instrument for use in performing surgical procedures with the tool portion of the instrument being readily detachable from the handle portion. This instrument has a coupling between the handle portion and the tool portion that permits a full transfer of all forces, including axial, transverse and rotational, from the handle portion to the tool portion during use of the instrument. The primary portions of the coupling are mating (complementary) conical nondeformable surfaces on one end of the tool member and one end of the handle member. In the preferred form, the two mating surfaces are also provided with flat portions that prevent relative rotation of the components. Further, these mating flat portions permit a selected orientation between external portions of the handle member and the work portion of the tools member.

Abstract: The device includes a chuck designed to be secured to a working tool and which has a front cavity for receiving an end of a drilling rod and a gripping device for fastening the end of the rod in this cavity. The gripping device is actuated by pneumatic or hydraulic pistons, sliding in a cylindrical chamber closed at the rear by a plug. In order to avoid rapid wear of this plug, a spring is arranged between the said plug and the adjacent face of the piston, the spring being strong enough to keep the piston away from the plug.

Abstract: An actuating arrangement for a tool clamping device (1) has a clamping bar (3) which is axially displaceable in a clamping direction in a machine tool spindle (2) under the effect of a spring arrangement (11), and a wedge transmission assembly (9) which is operable between the spindle and the clamping bar, with freely movable balls which bear respectively against three cone surfaces of which the first is provided on a clamping sleeve (10) which is axially displaceable in the clamping direction on the clamping bar under the force of the spring arrangement (11), the second is provided on a clamping ring (12) connected to the clamping bar (3) and the third is provided on a support ring (13) which is arrangd stationarily with respect to the spindle. Provided on the support ring is a fourth cone surface (18) which is inclined relative to the axis of the clamping bar in opposite relationship to the third cone surface.

Abstract: Disclosed is a very small sized rotating and cutting tool comprising a rotating and cutting part such as drill bit and a shank which is a separate solid body having a through aperture permitting insertion of the rotating and cutting part into the through aperture and removal of the rotating and cutting part from the through aperture when it has been worn or broken. With this arrangement the worn or broken rotating and cutting part can be easily removed from the shank simply by pushing the rotating and cutting part out of the through aperture of the shank, and the shank can be reused. Also, advantageously the lathing of a relatively large cylinder into a "large-and-small cylindrical object" as is carried out in making a conventional miniature drill, is not required. For these reasons miniature rotating-and-cutting tools can be manufactured and marketed at reduced price.

Abstract: A tool holder assembly includes a first member formed with a cylindrical bore and a second member including a cylindrical portion receivable in the bore of the first member. A locator screw hole extends radially through the first member. The second member is formed with a conical face having a centerline perpendicular to its longitudinal centerline. A locator screw is threaded into the locator screw hole in the first member. The locator screw includes a conical nose adapted to engage the conical face of the second member when the locator screw is turned in a first direction. The locator screw cooperates with the conical face of the second member to radially locate the second member with respect to the first member.

Abstract: An apparatus to selectively secure a drill chuck, wherein the drill bit is formed with a rear and forward hexagonal portion coaxially aligned with a circumferential groove positioned between the forward and rear sections, whereupon a hexagonal bore formed within an associated drill chuck receives the forward and rear sections. A lock pin is slidably mounted through the drill chuck orthogonally relative to an axis of the drill chuck and spaced above an axis of the drill chuck to permit engagement of the drill bit member within the drill chuck when a lock pin is in a forward position and disengagement of the groove of the drill bit in a lock pin is in a retracted second position.

Abstract: In apparatus for driving a spindle of a machine tool, the spindle being rotatably supported in a spindle housing and received in a took mounting opening adapted to be inserted with a pull stud at a front end thereof, including a took clamping drawbar provided with a collet for clamping the pull stud at a front end of the drawbar, and a device for axially moving the drawbar, there is provided a device interposed between the inner surface of the spindle and the outer periphery of the drawbar for transmitting a torque from the drawbar to the spindle. The drawbar is connected to a source of drive of the spindle.

Abstract: The actuating arrangement for a tool clamping device (1) has a clamping bar (3) which is axially displaceable in a clamping direction in a machine tool spindle (2) under the effect of a spring arrangement (11) and a firsst wedge transmission assembly (9) which is operable between the spindle and the clamping bar, with freely movable balls which bear respectively against three cone surfaces. They are disposed on a clamping sleeve (13) which is axially displaceable on the clamping bar, on a clamping ring (14) connected to the clamping bar (3), and on a support ring (15) which is arranged stationarily with respect to the spindle. The spring arrangement (11) acts by way of a pressure sleeve (12) which is axially displaceable on the clamping bar.

Abstract: The present invention concerns a mounting device with conical shank, particularly a 7/24ths cone, for cone-to-surface application for attachments, toolholders and tools, essentially constituted by a cone (1) for mounting in a spindle (2), by a front part (3) centered in the cone (1) and provided with a flange (4) for application via its rear face against the front face of the spindle (2), and by a knob (5) for assembly of the cone (1) and the front part (3) by means of an intermediate threaded element (6), on which bears an elastic unit (7) formed of Belleville washers intended to apply the cone (1) in the spindle (2) in locking position and mounted in compression between the said cone (1) and the front part (3), characterized in that it is provided with a device (8) for locking of the mutual position of the cone (1) and the front part (3), in mounting position in the spindle (2) with application of the flange (4) against the face of the said spindle (2), by gripping at least two balls (9) between the said co

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 boring bar has a longitudinal axis, with a steel head section having a cutting insert displaced from the longitudinal axis. In one embodiment, a cemented carbide section is joined directly thereto. In another embodiment, a intermediate section includes a devibrator body. The respective sections are joined by a centrally positioned drawbar threadedly inserted into the head section for maintaining a compressive force at the specifically configured connection between the axially aligned sections.

Abstract: A tool mounting apparatus for fixedly mounting a tool, an abrasive wheel and the like to a spindle of a machine such as a machine tool, by making use of a resilient means incorporated into the spindle. The resilient means is constituted to create a resilient force by compressing a sealingly enclosed high elastic fluid.

Abstract: An elongated grooving or threading tool has a cutting section, an intermediate section including a devibrator body, and a rearward cemented carbide section which are, respectively, held together in axial alignment by a drawbolt which engages the cutting section and cemented carbide section for holding the intermediate section under compression.

Abstract: A tool clamping device for machine tools comprises a draw bar that is axially displaceable inside a machine spindle and a locking element arranged in cooperation with the draw bar. The device becomes secured to a toolholder by effecting a relative movement between the draw bar and the locking element to effect a lateral displacement of the locking element into locking engagement with a shaft portion of the toolholder. Continued axial movement of the draw bar is transmitted as axial movement to the toolholder.

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: An improved plastic pipe reboring tool having an elongated shank, a generally concavo-convex cutting head, and changeable guide discs effective for cleaning residue glue and plastic from used plastic pipe and fittings so they can be used over again. The reboring tool is operational with both powered and manual chuck rotating devices and can be effectively used on different sizes of plastic pipe.

Abstract: The chuck body is centered on the power tool drive spindle by placing the smooth bore in the body over the smooth cylinder on the spindle with the recesses on the body axially moved onto the lugs (splines) on the shoulder of the spindle. The retaining screw is threaded into the end of the spindle and the screw head forces the chuck body against the shoulder. Neither the screw nor the bore/cylinder transmit torque; only the drive lugs transmit torque so the chuck can't jam on the spindle. This mount works with keyed chucks or keyless chucks as illustrated where the three inclined jaws are threadably engaged by split nut having a retainer pressed thereon. A clutch sleeve is biased rearward from the split nut and is moved towards the nut to engage interference lugs on the sleeve with lugs on the nut to restrain nut rotation to open or close the jaws. As the jaws approach full open, they push the sleeve to disengage the lugs. A spline coupler restrains sleeve rotation but can be omitted.

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 cutter adapted to be rotated about a front-to-rear extending longitudinal axis comprises a front portion having a cutting edge, and a rear portion for mounting a cutter. The rear portion has a conical outer periphery, the shortest radius of which is defined by a rearmost end of the rear portion. The rear portion includes a hook-shaped projection formed by a laterally open recess in the outer periphery.

Abstract: A tool adapted for use with a drill for installing screw anchors in concrete or masonry walls or the like having a sleeve type body, a bit holder slidably located in the body, a drill bit with a handle secured in the bit holder, a coil spring seated on a collar of the bit holder and extending around the bit, and a nut driver secured to the front end of the body. The bit holder is adapted to receive the bit handle and to also serve as a stabilizer for the bit and the coil spring. The nut driver is formed to guide the bit and to shield the front end of the bit from contact with drive members that may be secured in the nut driver.

Abstract: Quick-change methods and apparatus enable the cutting tool of a lens cutting machine to be exchanged with minimal down time of the machine. A replacement cutting tool is gauged in an off-machine gauging mechanism while the machine is able to continue an on-going lens cutting operation. A stop surface of the replacement tool is adjusted in the gauging mechanism in order to reset the cutting edge, whereby subsequent insertion of the replacement tool in the machine assures that the cutting edge will be located in a predetermined reference plane of the machine.

Abstract: A tool or workpiece holder retention mechanism which engagably retains the holder retention portion of the holder by creating a clamping force which draws the holder retention portion into a cooperatively formed area between two retaining jaws. Two abutting surfaces, one on the holder and one on the abutting surface on the retention mechanism housing, have formed thereon cooperatively engagable surfaces at least one of which is generally spirally formed, which meshedly engage to self-center the tool holder. Preferably the cooperatively engagable surfaces are in the form of mating spiral gear teeth specifically the jaws and the holder retention portion are constructed and actuated so as to be radially freely floatable to avoid interference with the self-centering function of the mating spiral surfaces.

Abstract: A muzzle brake and tool for effectively installing the brake on the muzzle end of a rifle without the necessity of engaging the services of a gunsmith. The tool for installation includes a handle assembly, a bore pilot and an insertable threading die and cutter and cutter holder by which the owner of the rifle can effectively trim the end of the barrel and then form threads on the external surface of the barrel onto which the muzzle brake can be screw threaded. The muzzle brake is a hollow cylindrical member having an internally threaded end engaged with the externally threaded end of the muzzle of the rifle together with two flat sides and four vents extending horizontally when installed on the rifle barrel with the vents being equally spaced and equally sized and communicating the hollow interior of the muzzle brake with the atmosphere to release gases thereby reducing recoil felt when the gun is fired.