Abstract: An improved method and device are provided for forming and/or maintaining a percutaneous access pathway. The device generally comprises an access pathway. The provided assembly substantially reduces the possibility of injury while accessing and/or re-accessing a body space.

Abstract: The present invention is directed at a thermally sensitive retention mechanism for orthopedic cutting instruments. More specifically, the present invention incorporates structural engagement features into a rotational orthopedic cutting instrument that transfers torque from a driver to a cutting component and which upon heating result in disengagement of the cutting component from the driver portion.

Abstract: The present invention discloses a tapping shank which mainly consists of axial, radial and deflection comprehensive floating mechanisms and a high-sensitivity rolling clutch safety mechanism. The present invention has an actual safety guarantee in tapping an M1 thread, solves the problems of axial pressure and tension of a main shaft on a screw tap, and eccentric and deflection errors between the screw tap and a bottom hole, ensures the precision of a hole diameter and a longest service life of the screw tap, and is also a high-precision hole machining floating reamer shank.

Abstract: An apparatus for indicating a drilling thrust of a hand-operated drill includes a thrust-indicator assembly for attaching between a drill motor and a drill chuck of the hand-operated drill to indicate the drilling thrust. A method of indicating a drilling thrust asserted on a hand-operated drill includes: attaching a thrust-indicator assembly between a drill motor and a drill chuck of a hand-operated drill; and indicating, with the thrust-indicator assembly, a drilling thrust asserted on the drill chuck.

Abstract: A compact, highly-reusable, locking device includes a carrier, roller elements, a body, and a band spring. The carrier includes a plurality of apertures for receiving each a corresponding roller element. The body includes a plurality of detents separated by ridges. The number of detents is different than the number of roller elements. The body is at least partially received in the carrier such that the detents are in radial alignment with the apertures. The band spring is disposed about the roller elements. The roller elements travel across the detents and ridges to cause elastic deformation of the band spring when the body is rotated about a central axis.

Abstract: A portable power drill comprises a housing, a drilling implement carrying drive spindle, and two individually powered and controlled motors for rotating and axially feeding the drive spindle. The drive spindle is rotative and axially displaceable relative to the housing and connected to the drive and feed motors via angle gears including two bevel gears supported on the drive spindle. The feed via an axially locked but rotative nut piece and an external thread on the drive spindle, whereas the drive motor is drivingly connected to the drive spindle via longitudinal keyways on the drive spindle and mating splines in one of the bevel gears. The drive motor and the feed motor are electric motors controlled and monitored by a programmable control unit.

Abstract: This machine includes a casing (2), a tool-holder spindle (4), a motor (6), a drive mechanism (12) having positive feed which mechanically connects the motor to the spindle and which includes a first drive member (32) for rotating the spindle, a second drive member (34) for driving the spindle in translation and which is screwed onto the spindle (4) in order to advance or return the spindle, and a clutch (36) having a return configuration which disengages the second member and the motor and an advance configuration which engages them. The clutch includes a rotary engagement member (44), a first key (48) which is movable between a position for connecting the rotary member to the motor and a position for disengaging the rotary member, and a second key (50) which is movable between a position for connecting the rotary member to the casing and a position for disengaging the rotary member.

Abstract: A tool chuck may include a chuck body defining a longitudinal axis. A sleeve may be mounted on the chuck body for movement between a first axial position and a second axial position. A clutch part provided on the sleeve. The clutch part may engage with a cooperating clutch part when the sleeve is in the second axial position. The clutch part may have a working surface that faces in a direction perpendicular to the longitudinal axis.

Abstract: A method of engaging a fastener may include attaching a guide assembly to a structure. The guide assembly may include a first arm, a second arm, and a head assembly mounted to an end of the first arm. The method may further include threadably engaging a tool sleeve to the head assembly, coupling a tool to the tool sleeve, and adjusting and clamping the angular orientation of the second arm relative to the first arm using a swivel mechanism. The method may additionally include engaging the tool to a fastener, rotating the tool sleeve relative to the head assembly, and applying a down force to the fastener in response to rotating the tool sleeve to move the tool axially relative to the head assembly.

Abstract: This invention generally pertains to a self-reversing tapping apparatus system, and more particularly, embodiments of this system include an improved coolant system, a reduction of the components which reverse rotational direction, and provides a modular tapping apparatus system.

Abstract: A tool (10) including a drive shaft (36) having an axis of rotation, and a plurality of bit holders (28,30) interchangeable with one another at a position of use. The bit holders (28,30) being mounted on a turret (26) which is rotatable around an axis (k) set at an angle to the axis of rotation of the drive shaft (36). The drive shaft (36) being in drive connection with a respective bit holder (28,30) at the position of use, wherein the tool (10) includes means (20x) for engaging a clutch (46) which activates a drive train (44) to establish a drive connection between the drive shaft (36) and the turret (26) so that subsequent operation of the drive shaft (36) rotates the turret (26) to interchange the positions of the bit holders (28,30) at the position of use, and wherein after the turret (26) has been rotated the clutch (46) is disengaged to deactivate the drive train (44) to prevent any further rotation of the turret (26).

Abstract: An adjustable torque limiter that can be coupled between a high speed driver and the socket that rotates a mechanical fastener. When a preset torque level is reached, the torque limiter disengages the rotational drive force from the bit. The adjustability of the torque limitation is accomplished by varying the amount of spring force by which a thrust plate (coupled to the high speed driver) is forced against a set of steel balls residing in slots of a radial torque plate and in a set of paths formed in a concavity of an upper torque body (coupled to the driven socket engaging stud). When a certain preset torque is transmitted from the driver to the socket, the steel balls traverse outward along the separate arced ramp radial paths therein the upper torque body until the balls enter an annular race that allows the thrust plate to go into a disengaged or free wheel mode from the upper torque body.

Abstract: A tool (10) including a drive shaft (36) having an axis of rotation, and a plurality of bit holders (28,30) interchangeable with one another at a position of use. The bit holders (28,30) being mounted on a turret (26) which is rotatable around an axis (k) set at an angle to the axis of rotation of the drive shaft (36). The drive shaft (36) being in drive connection with a respective bit holder (28,30) at the position of use, wherein the tool (10) includes means (20x) for engaging a clutch (46) which activates a drive train (44) to establish a drive connection between the drive shaft (36) and the turret (26) so that subsequent operation of the drive shaft (36) rotates the turret (26) to interchange the positions of the bit holders (28,30) at the position of use, and wherein after the turret (26) has been rotated the clutch (46) is disengaged to deactivate the drive train (44) to prevent any further rotation of the turret (26).

Abstract: A power driver may include a housing, a tool chuck and a power take off mechanism. The tool chuck may have an input shaft mounted for rotation on the housing. The input shaft may support threaded chuck jaws. A chuck actuating shaft may be mounted for rotation on the input shaft. The chuck actuating shaft may be screw coupled to the threaded chuck jaws. The power take off mechanism may be connected to the tool chuck. The power take off mechanism may be adjustable into a DRILL DRIVE MODE to rotationally drive the input shaft and the chuck actuating shaft together as a unit, and a CHUCK MODE to rotationally drive the chuck actuating shaft relative to the input shaft. The power take off mechanism may be internal of the housing. The power take off mechanism in the CHUCK MODE may rotationally fix the input shaft to the housing.

Abstract: A power driver may include a housing, a tool chuck and a power take off mechanism. The tool chuck may have an input shaft mounted for rotation on the housing. The input shaft may support chuck jaws. A chuck actuating shaft may be mounted for rotation on the input shaft. The power take off mechanism may be connected to the tool chuck. The power take off mechanism may be adjustable into a DRILL DRIVE MODE to rotationally drive the input shaft and the chuck actuating shaft together as a unit, and a CHUCK MODE to use the transmission shaft to rotationally drive the chuck actuating shaft relative to the input shaft. The transmission shaft may be a gear shaft axially aligned with the input shaft, or a tertiary shaft axially offset from the input shaft.

Abstract: A power driver may include a housing, a tool chuck and a power take off mechanism. The tool chuck may have an input shaft mounted for rotation on the housing. The input shaft may support chuck jaws. A chuck actuating shaft may be mounted for rotation on the input shaft. The power take off mechanism may be connected to the tool chuck. The power take off mechanism may be adjustable into a DRILL DRIVE MODE to rotationally drive the input shaft and the chuck actuating shaft together as a unit, and a CHUCK MODE to rotationally drive the chuck actuating shaft relative to the input shaft. The power take off mechanism may be internal of the housing. The power take off mechanism in the CHUCK MODE may rotationally fix the input shaft to the housing.

Abstract: A power driver may include a housing, a tool chuck and a power take off mechanism. The tool chuck may have an input shaft mounted for rotation on the housing. The input shaft may support chuck jaws. A chuck actuating shaft may be mounted for rotation on the input shaft. The power take off mechanism may be connected to the tool chuck. The power take off mechanism may be adjustable into a DRILL/DRIVE MODE to rotationally drive the input shaft and the chuck actuating shaft together as a unit. Here, a brake may resist relative rotation between the input shaft and the chuck actuating shaft. The power take off mechanism may be adjustable into a CHUCK MODE in which a gear mounted on the input shaft may rotationally drive the chuck actuating shaft relative to the input shaft. Here, the brake may be deactivated.

Abstract: A power driver may include a housing, a tool chuck and a power take off mechanism. The tool chuck may have an input shaft mounted for rotation on the housing. The input shaft may support jaws. A chuck actuating shaft may be mounted for rotation on the input shaft. The power take off mechanism may be connected to the tool chuck. The power take off mechanism may be adjustable into a DRILL DRIVE MODE to rotationally drive the input shaft and the chuck actuating shaft together as a unit, and a CHUCK MODE to rotationally drive the chuck actuating shaft relative to the input shaft. The power take off mechanism may include a shift ring that is movable axially to achieve the various operational modes. During such axial movement, the shift ring may be rotationally locked to the housing and/or transmission components via compliant grounding mechanisms.

Abstract: A power (1) tool including a driven member (15) that is operable to grip and drive at least one working element (4), drive means (25) operable to drive the driven member, the power tool being operable in either a working mode in which the driven member is driven to enable the working element to perform work, or an adjustment mode in which the driven member is adjusted to grip or release the working element, torque control means (7) controlling the torque produced by the drive means, the torque control means being operable to render the drive means inoperable when the torque exceeds a pre-determined level, the torque control means having an adjustment setting (17) which must be selected to enable the power tool to operate in an adjustment mode whereby the adjustment setting corresponds to a relatively low level of torque.

Abstract: The present invention provides an automated-torque controlled tool for attachment to a milling machine. The tool comprises an elongated hollow housing defined by a neck section, a middle section, and a bottom section. The neck section is adapted to engage a spindle of the milling machine for rotational and axial movement therewith. A torque spring is situated within the middle section of the housing. A torque adjuster is dimensioned and configured to sit within the neck section of the housing on top the torque spring. A bit holder and driver mechanism are rotationally mounted within the bottom section of the housing. When the torque threshold is reached by the bit holder, the driver mechanism rotationally disengages from the bit holder.

Abstract: A drilling/tapping/unscrewing apparatus including a transmission shaft of a power source on which a drilling ratio gear, a tapping ratio gear and an unscrewing ratio gear are mounted for transmitting the power of the power source to a bit. The apparatus further includes an adjustment unit for controlling the switching between the drilling, tapping and unscrewing operations of the apparatus. The adjustment mechanism includes a bit shaft on which a drilling gear, a tapping gear and an unscrewing gear are fitted. The tapping gear and the unscrewing gear are respectively engaged with the tapping ratio gear and the unscrewing ratio gear. The drilling gear and the tapping gear are controlled by an adjustment button to synchronously move up and down on the bit shaft, whereby the drilling gear can be engaged with or disengaged from the drilling ratio gear.

Abstract: Method and apparatus for improving the efficiency of the rotating cutter of a tool by converting at least part of the rotational torque applied to the cutter to repeated rotational impact forces.

Abstract: In a hand-guided percussion drilling machine an arresting coupling non-rotatably coupling a drilling spindle relative to a machine housing is arranged on an intermediate shaft rotatably connected with the drilling spindle and extending parallel to and at a radial distance from the drilling spindle and at a radial distance from the motor shaft, wherein the arresting coupling openings during a torque transmission from a drive motor to a tool holder in one direction and closes during a torque transmission from the tool holder in an opposite direction.

Abstract: A hammer is provided which enables the orientation of a tool or bit mounted within a spindle of the hammer to be rotated to the required orientation. The hammer comprises a housing part having an aperture therein in which a spindle that is mounted so that the spindle extends out of the housing through the aperture. The spindle is capable of being rotated about its axis to any of a plurality of orientations, so as to alter the orientation of a tool or bit mounted therein. A locking ring is located around the spindle which locking ring can be moved axially along the spindle into and out of engagement with the housing part, so that when the locking ring engages the housing, it prevents the spindle from rotating with respect to the housing. A grip ring is located around the spindle and can be rotated about the axis of the spindle from a first position in which it prevents disengagement of the locking ring from the housing.

Abstract: Driving engagement is obtained between an arbor held in a machine tool and a collet holder that supports a drill bit by locking balls that are secured in engagement with drive surfaces by a locking ring. A nose cone is adjustably attached to the front of the locking ring and when the nose cone bottoms out on the workpiece, continued movement of the drill bit assembly relative to the nose cone assembly causes the locking ring to allow the locking balls to disengage the collet holder after ½″ additional travel. Inner and outer springs reposition the clutch mechanism in its initial position for subsequent drilling operations.

Abstract: A hammer is provided which enables the orientation of a tool or bit mounted within a spindle of the hammer to be rotated to the required orientation. The hammer comprises a housing part having an aperture therein in which a spindle that is mounted so that the spindle extends out of the housing through the aperture. The spindle is capable of being rotated about its axis to any of a plurality of orientations, so as to alter the orientation of a tool or bit mounted therein. A locking ring is located around the spindle which locking ring can be moved axially along the spindle into and out of engagement with the housing part, so that when the locking ring engages the housing, it prevents the spindle from rotating with respect to the housing. A grip ring is located around the spindle and can be rotated about the axis of the spindle from a first position in which it prevents disengagement of the locking ring from the housing.

Abstract: Driving engagement is obtained between an arbor held in a machine tool and a collet holder that supports a drill bit by locking balls that are secured in engagement with drive surfaces by a locking ring. A nose cone is adjustably attached to the front of the locking ring and when the nose cone bottoms out on the workpiece, continued movement of the drill bit assembly relative to the nose cone assembly causes the locking ring to allow the locking balls to disengage the collet holder after ½″ additional travel. Inner and outer springs reposition the clutch mechanism in its initial position for subsequent drilling operations.

Abstract: This pneumatic machine tool includes a driving shaft (14) driven in rotation by pneumatic drive means (12), a driven tool-carrier shaft (16), a gear mechanism (18) disposed between the driving shaft and the driven shaft to drive the latter, a set of sensors (22) for measuring operating parameters of the machine tool, and a central control unit (20) in which are stored algorithms for controlling machining as a function of data received from the sensors, the gear mechanism including means (24, 26, 28, 30) for changing the gear ratio. The gear mechanism includes primary and secondary sets (24, 26) of toothed wheels with different demultiplication ratios, each adapted to rotate freely relative to the driving shaft (14). The speed changing means include a positive clutch (28) constrained to rotate with the driving shaft (14) and axially mobile relative thereto between two end positions in which the positive clutch (28) is engaged with respective sets of toothed wheels (24, 26).

Abstract: A thread-cutting apparatus with reversal of the direction of rotation with a sun-and-planet gear with an axially displaceable reversing device for reversing the direction of rotation of a drill, held in the grip of a spindle, which can be pulled out preferably against a length equalization spring after a given drilling head depth has been reached, especially reversing chucks with pressure equalization pipelines, which discharge into an equalization chamber, sealed by a movable wall from the outside air, wherein the reversing device is actuated by an external driving element, which can be actuated by a reversing signal generated by an actuator.

Abstract: A hand-guided drilling machine or percussion drilling machine has a machine housing, a drilling spindle, a drive motor for rotatably driving the drilling spindle, a tool holderformed as a drilling chuck and screwed with the drilling spindle through a thread, the drilling spindle during exchanging a tool or exchanging the tool holder receiving a releasing or tightening moment, an arresting device non-rotatably coupling the drilling spindle relative to the machine housing, an intermediate shaft non-rotatably connected with the drilling spindle, a component connected with the machine housing, the arresting device being arranged between one element selected from the group consisting of the drilling spindle and the intermediate shaft and another element selected from the group consisting of the machine housing and the component, the arresting device automatically opening during a torque transmission from the drive motor to the tool and automatically closing during the torque transmission from the tool holder in an

Abstract: A clutch device has a shaft rod, a hollow torsion sleeve, a trip device, an outer toothed gear, an inner toothed gear, and a first belt pulley. The outer toothed gear is disposed on the trip device. The hollow torsion sleeve has a plurality of grooves. The trip device has a center hole to receive the hollow torsion sleeve, and a plurality of radiated thread holes. The inner toothed gear is disposed on the first belt pulley. The outer toothed gear engages with the inner toothed gear. Each radiated thread hole receives a ball, a spring, and a stud. Each groove receives the respective ball. The shaft rod is inserted through the hollow torsion sleeve, the first belt pulley, and a second belt pulley.

Abstract: A rotatable torque adjusting device which is incorporated in a rotation tool for adjusting output torque of the rotation tool is disclosed. The rotation tool has a front end surface on which a support cylinder is provided to rotatably support an output shaft which provides the output torque. Cavities are provided on the front end surface and surround the support cylinder to each receive a spherical member which applies a force to a rotating disk inside the rotation tool to adjust the output torque. The torque adjusting device includes a cam ring rotatably fit over the support cylinder, having a plurality of circumferentially-extending arc-shaped camming projections, each defining a cam. A follower ring non-rotatably fit over the support cylinder, having camming projections, each defining a follower engageable with the respective cam of the cam ring which converts a relative rotation therebetween into an axial movement of the cam ring.

Abstract: A thread cutter, particularly a reversing chuck with a spindle which can be pulled out, has pressure equalizing pipelines which discharge into an equalizing chamber which is sealed from the outside air by a movable wall.

Abstract: A drive collet assembly for an internal thread producing tap. The collet includes a collar that is attached to the stem of the tap using set screws. The collar is received into a recess of the body portion of a drive collet and retained therein using a spring clip. A smaller diameter aperture extends into the body portion above the recess, the aperture receiving a portion of the stem of the tap, the portion has a pair of opposed flats thereon. At least two laterally extending threaded apertures intersect the smaller diameter aperture and each receive a rigid button, a flexible element and a set screw. The set screw can be adjusted to provide a desired breakaway torque which will protect the tap from breakage should an over-torque condition occur. The flexible element will allow the rigid buttons to be forced outwardly so that the drive collet assembly spins freely about the jammed tap, rather than twisting it off.

Abstract: A self-reversing tapping attachment comprises a forward drive member and a reverse drive member drivingly engageable with a tap spindle drive member, as well as gear members drivingly engageable with the forward drive member and the reverse drive member, and includes shock absorbers cushioning impact between the driver members and the gear members. An exchangeable chuck holding a tap is detachably mountable on the tap spindle driver, permitting use of taps of different weight and material.

Abstract: A torque adjustment control mechanism connected between the motor housing base and chuck of a hand drill and controlled to adjust its output torque, including a connecting barrel connected to the motor housing base, a coupling member mounted within the connecting barrel and coupled to the motor housing base, a holder base fixedly secured to the connecting barrel, and adjustment cap threaded onto the front neck of the holder base to hold an index ring on the inside, and a plurality of holding down spring devices mounted in respective longitudinal through holes on the holder base and stopped between the coupling member and the index ring, wherein the output torque of the hand drill is adjusted by changing the holding down pressure of the holding down spring devices by turning the adjustment cap forwards or backwards relative to the holder base.

Abstract: A self-reversing tapping attachment comprises a housing including a tap holding spindle member, a forward drive member and a reverse drive member the latter two members being interchangeable with one another; at least one internal removable fastener with external access, and a base member detachably mountable on the housing, unfastening of the at least one internal fastener and the base member permitting removal of the drive members and the tap holding spindle member from the housing. A method for disassembly includes the steps of unfastening the base member, gaining access to the internal fasteners, unfastening them, and pulling out the tap spindle member.

Abstract: A multispindle thread cutter apparatus is proposed, which has a drive shaft (3) to be driven by motor and which has a plurality of work spindles (4). Interposed between the drive shaft (4) and the work spindles (4) is a distributor and reversing gear (33), by way of which the work spindles (4) are driven to rotate by the drive shaft (3). Each work spindle (4) is assigned its own single reversing coupling (34), which has its own single switchover device (35), so that the directions of rotation of the work spindles (4) can be reversed while the drive shaft (3) continues to rotate uninterruptedly in the same direction.

Abstract: A tapper mechanism having (i) a rotatable tapper body with a clutch, (ii) a driven shaft having a portion rotatably held coaxially in the tapper body for limited axial motion therein, (iii) an engageable claw connected from the driven shaft for selective engagement with the driven shaft for selectively transmitting torque from the tapper body to the driven shaft upon the axial movement of the driven shaft within the tapper body the transmission of torque from the tapper body to the driven shaft is interrupted by the disengagement of the clutch and the driven shaft is axially moved into a neutral state, (iv) a tap connected from an end of the driven shaft that is remote from the tapper body, (v) an engaging slider disposed between the driven shaft and the engageable claw, the engageable claw and the driven shaft being adapted to rotate together and are axially displaceable relative to each other within the tapper body during such rotation, and (vi) a clutch spring urging the engageable claw away from the clutc

Abstract: Disclosed is a torque-adjustment controller for use with a tool to safely adjust and control the torque the tool works on a workpiece. The torque-adjustment controller mainly consists of a housing, an output shaft, an input shaft, a stepped ring, a lugged movable member contacting the stepped ring, a torque spring disposed between the output and the input shafts. The output shaft has recesses to engage with steel balls contained on the input shaft so that force exerted on the input shaft by a tool may be transmitted to the output shaft via the engagement of the steel balls with the recesses of the output shaft. The stepped ring has multiple sets of steps providing different head drops and will cause the lugged movable member contacting it to shift axially when the stepped ring is rotated. The axially shifted movable member will further compress the torque spring to generate stronger torque or release the torque spring for the same to generate weaker torque.

Abstract: A tapping attachment for use in connection with radial tapping comprises a tap spindle member rotatable in a tapping direction, a driven part engageable with a driving part from a power source in a different direction from the tapping direction, a forward drive member engageable with the tap spindle member to drive the tap spindle member in the tapping direction, a reverse drive member engageable with the tap spindle to drive it in a direction opposite to the tapping direction, means for transmitting drive to the forward drive member and the reverse drive member and engageable with the driven part for receiving drive and with the tap spindle member.

Abstract: A stabilizing support attaches a tapping head to a drive having a spindle rotatable within a quill. The support includes a substantially cylindrically symmetric hollow tubular housing axially divided into two sections. A first section has a first bore sized to slip over and lock to a quill of the rotating drive, and a second section having a second bore sized to receive the tapping head therein in a close sliding fit. The housing is releasably locked to the drive quill, and a nonrotating portion of the tapping head is fixed to the housing to prevent its rotational movement relative to the housing.

Abstract: A torque adjustment device is disclosed which enhances durability and in which it is easy to set a maximum torque and to perform fine adjustment while normally keeping constant a rotational force of a torque adjustment sleeve. A cylindrical clutch adjustment handle is rotatably mounted at an opening portion of a housing. A clutch case is received within the clutch adjustment handle. A plurality of slant surfaces which are different in height in the axial direction are formed in an inner circumferential portion of the clutch adjustment handle. A clutch plate is supported to the slant surfaces. Also, the clutch plate is displaceably mounted along an outer peripheral portion of the clutch case. Steel balls which are held by a clutch surface of an inwardly toothed gear are received in holes of the clutch case. A spring is interposed between an abutment plate in abutment with the steel balls and the clutch plate. A plurality of recesses are formed in a flanged portion of the clutch adjustment handle.

Abstract: A threading apparatus has a rotatable and axially movable driving part, a driven part which is axially displaceable relative to the driving part and adapted for driving a threading tool, a switchable form-locking coupling device including a switching member connected with the driven part and provided with coupling members and at least one coupling part driven by the driving part and having coupling elements. The driven part with the switching member and the at least one coupling part are axially relatively displaceable so that the at least one coupling part with the coupling elements is positionable with the coupling members in form-locking coupling engagement with the driven part or in a not driven intermediate position. The switching member is connected with the driven part in an axially not-displaceable manner and coupled form-lockingly in a circumferential direction and drives the driven part.

Abstract: In self-reversing tapping attachments improved ball drive means are connectable to source of rotational drive and drive transmitting means are engagable, with the drive means including at least one driving ball member and with the drive transmitting means defining at least one slot for the ball member, which slot includes a ramp section inclined so that upon engagement between the drive means and the ball member the latter travels upwardly thereby cushioning impact between the drive means and the drive transmitting means. A radially extending member on a tap holder member has a radius of curvature less than the radius of curvature of contact members of the drive transmitting means to cushion impact.

Abstract: A tapping attachment for driving a tapping spindle constructed to be adapted for both direct drive and reverse drive of the spindle. The drive of the spindle is by way of a resiliently mounted dog ring having rigid radially extending drive dogs, extending radially outwardly and inwardly from a drive ring. The driving dogs are rigid, having slanting sides to accommodate clutching engagement and disengagement. Clutching engagement and disengagement occur as a result of relative axial movement as between the attachment and the drive spindle. The drive spindle has a central bore in which is provided an insert member having an axial bore which is connected to a flexible tube within the bore of the spindle, which accommodates relative axial movement, the flexible tube communicating with a similar bore in a tap itself. These bores provide a channel for continuously supplying coolant to the machine and to the spindle itself.

Abstract: A self-reversing tapping attachment employing dog drive includes driver means with at least one drive element for driving engagement with at least one dogging element on drive transmitting means, the dogging element and drive element being such that engagement between them is over an area greater than a point and further includes a drive spindle member for carrying a tap having at least one drive component for engagement with a dogging element on the drive transmitting means, the driver elements and dogging elements providing minimum interference between forward and reverse drive.

Abstract: Certain tapping and jig grinding attachments to drill presses on Bridgeport Mills, for example, require a stop-bar to operate properly. The stop-bar described quickly and easily attaches to the lower inside of the mill ram, and functions to hold the stop arm of a tapping attachment like a Tapmatic.RTM. without interfering with spindle travel or requiring repositioning as the result of worktable position changes.

Abstract: An internal thread forming apparatus includes a housing body fixed on a machine tool, a driving spindle connected to the rotatable main shaft of the machine tool and rotatable at the same speed as that of the main shaft, a movable body movable vertically within the housing body, a rotary lever actuatable to move the movable body downward, and a first return spring biasing the rotary lever to return to a static position. A positive-revolution driving body and a reverse-revolution driving body are carried on and are movable synchronously with the movable body, and rotate in opposite directions. A speed reduction gearing interconnects the driving spindle and the face gears so as to rotate the face gears at a speed less than that of the driving spindle. An output spindle is mounted slidably within the movable body. A tap is fastened to the output spindle. A driving block is carried on the output spindle.

Abstract: A hand tool can remove burrs from an aperture in a workpiece. The tool has a hollow handle and a shaft rotatably mounted in the handle to reciprocate axially therein. The tool has a thruster for urging the shaft to extend axially. A rider is mounted in the handle for engaging and rotating the shaft as it extends axially from the handle. This rider can allow axial retraction of the shaft into the handle without rotation. A deburring bit (e.g. a countersink bit) is mounted at an outer end of the shaft. Thus the bit turns when the shaft extends as the handle withdraws from the workpiece.