Abstract: An apparatus for controlling depth machining in a space and with the use of jigs, includes a body having two sliding parts biased by a spring and suitable for a drilling tool, with some clearance. One part is provided with couplings for assembling on a machine-tool, and the other is provided with a presser and a drill guide. Another spring which is suitable for keeping the tool centered is included and a relative stroke between the two sliding parts is longer than the drilling stroke of the tool.

Abstract: A puncher comprising two drills held on chucks attached on shafts combined with gears provided in two front seats and a rear seat able to be changed in their position so as to change the distance between the two drills, the front seats and the rear seat being connected with a main seat which is possible to be moved up and down by means of a vertical threaded rod and a support rod so as to lower down the two drills to punch holes in one of many distances adjustable in papers placed on a bottom base and pinched immovable in a pincher on the base.

Abstract: A power tool with a two-part housing has a drive motor with a pinion gear on the motor shaft. A plastic cylindrical ring gear is fixed to the motor in coaxial surrounding relationship with the pinion gear and has attachment lugs which fit between the two parts of the tool housing and are fixedly secured to each. A plastic gear carrier frame is insert molded on a splined end of a metal output shaft and is receivable within the ring gear and has radial slots for respectively receiving pins which respectively rotatably mount three planet gears in meshing engagement with the pinion gear and the ring gear. The carrier frame has a hollow stub shaft portion which receives the pinion gear therethrough, the stub shaft portion having an elastomeric O-ring seated in a circumferential groove therein for press-fitting a ball bearing thereon, the ball bearing being in turn press-fitted in a seat in the ring gear to support the planet gear assembly.

Abstract: A quill feed and spindle drive assembly has a bore formed along a longitudinal axis of a housing. A nut, rotatably mounted to the housing, carries a threaded quill which reciprocates along the axis through the housing. An elongate rotatable spindle passes through the bore and carries a tool at an outer end. The threaded quill is preferably a hollow screw, within which the spindle is mounted, and the quill and spindle are coextensive and linearly moved in unison along the axis. The quill provides both radial and axial thrust support, and forms a longitudinal guideway for the tool.

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 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: A tool driver comprising a shaft, a shank, a flange, a clamp and a retainer. The shaft has a longitudinal axis and opposed ends. The shank is joined to one end of the shaft. The flange is joined to the other end of the shaft and has an outwardly facing flange surface extending from the shaft transversely of the axis. The clamp has a clamping surface facing the flange surface. The clamp is movable axially relative to the flange to vary the separation of the surfaces. The retainer is operatively connected to the clamp and is movable relative to the clamp between a first position and a second position. The retainer, in the first position, precludes relative movement of the clamp and the flange.

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

Abstract: A surgical device including a handpiece adapted to receive a surgical tool, a motor driven drive shaft for rotating the tool about an axis, a static seal element sealed to the motor assembly, and a dynamic seal element sealed to the drive shaft, the seal elements having mating sealing portions defining a face seal in a surface transverse to the axis of rotation of the drive shaft.

Abstract: The rivet shaver driver element of the present invention includes an internally threaded hollow cylindrical body. At one end of the hollow cylindrical body is located a drive slot. Along the length of the driver element are spindle locking slots. Wrench flats are formed on the sides of the drive element. The placement of the drive slot spindle locking slots and wrench flats as such that the driver element is dynamically symmetrical.

Abstract: A device for drilling an undercut in a borehole in a receiving material comprises an axially extending guide sleeve with an eccentric bore and an eccentric bushing located in the eccentric bore and being rotatable therein relative to the sleeve. A tension spring is located between the sleeve and the bushing. During rotation of the bushing, relative to the sleeve, the torsion spring is stressed. A drive shaft with a cutter head at one end extends through the bushing and is brought into an eccentric position relative to the sleeve and at the same time commences an undercut in the borehole. A lock is provided with a set of teeth on the sleeve preventing rotation of the sleeve with the bushing. When the maximum eccentricity of the drive shaft is established, the lock can be released and the sleeve rotated along with the bushing by an eccentric transmission. During such rotation, a complete circumferentially extending undercut can be formed in the borehole.

Abstract: A pneumatic power tool having a rotary driven output spindle defining an axis, an air motor having an output shaft axially aligned with the output spindle, transmission means connecting the output shaft and the spindle, and control means for operating the air motor. Incorporated in the transmission means is a two speed gear system to provide a first drive having a lower torque output and a second gear reduced having a higher torque output and a lower rotary speed output relative to the first drive. The two speed gear system also includes a spindle assembly which is axially translatable, biasing means for biasing the spindle assembly to the first drive position, and a collar rotatable about the axis and including a follower cooperative between the spindle assembly and the collar to effect axial movement of the spindle assembly between the first and second drive positions.

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: An apparatus for assisting a podiatrist in the performance of various para-medical operations on patients. The apparatus consists of a unit movble on the ground as if a dental unit used by dentists. The work unit includes a pneumatic network, connected to an external air compressor, and to which is connected three tools. Two of these tools include drilling heads, pressurized water outlets and pressurized air outlets, while the third tool includes a pressurized water outlet and pressurized air outlet. Operation of each tool, and of each outlet and drill of a given tool, is made independently of each other, and controlled by a number of knobs, buttons and dials.

Abstract: The invention relates to a tool-spindle arrangement comprising a main spindle rotatably supported in a spindle housing and an electrical drive motor drivingly connected to the main spindle. The main spindle is constructed hollow to receive operating elements of the spindle arrangement. It is suggested that the motor shaft of the electrical drive motor itself is constructed as a main spindle.The main spindle is part of the drive motor. It is preferably constructed in two parts, namely, a spindle section and a motor-shaft section which, when connecting the drive motor to the machine, are coupled with one another. The motor-shaft section is also constructed hollow to receive operating elements, for example clamping members for chucking of the tool, air-blast pipes, cooling-medium pipes, etc.

Abstract: The present invention relates to a drill head having removable spindles. The spindles include a shaft adapted for receiving and rotating a drill. The shaft is also removably rotatable with the drilling unit. A mechanism for providing a coolant to the workpiece is coupled with the spindle.

Abstract: A portable gas operated rotary tool is provided for milling a surface on the end of a cylindrical workpiece. The tool has a motor powered by a pressurized gas, such as compressed air. The motor directly drives a rotary milling head which is axially aligned with the axis of rotation of the motor. The motor has a stator chamber which houses a rotor having radial slots. Vanes are journaled within said slots for radial movement within the slot and define progressively expanding cavities. The milling head has a central bore for mounting on an arbor of the motor. The milling head includes blades for milling a frustoconical surface on the workpiece and a non-locking pilot tube to align the tool with the longitudinal axis of the workpiece. A novel air motor design is also disclosed that provides very high rotary speeds using standard air system pressure, very high horsepower, a low polar moment of inertia and a low torque.

Abstract: A portable gas operated rotary tool is provided for milling a surface on the end of a cylindrical workpiece. The tool has a motor powered by a pressurized gas, such as compressed air. The motor directly drives a rotary milling head which is axially aligned with the axis of rotation of the motor. The motor has a stator chamber which houses a rotor having radial slots. Vanes are journaled within said slots for radial movement within the slot and define progressively expanding cavities. The milling head has a central bore for mounting on an arbor of the motor. The milling head includes blades for milling a frustonconical surface on the workpiece and means to align the tool with the longitudinal axis of the workpiece.

Abstract: A high speed drilling system is disclosed for high speed drilling of very small holes in workpieces such as printed circuit boards. The X-Y positioning system includes air bearings to provide lift between the stationary guide beams, the crossbeam and the top table, and further includes a vacuum preloading apparatus for providing a preloading force between the table and the guide beam. The preload force dampens Z axis oscillations which can result in drill bit breakage. The top table is a lightweight honeycomb structure, whose effective rigidity is virtually that of the guide beam due to the vacuum preloading. The system includes pairs of spindles, one a conventional spindle for drilling holes larger than about 0.125 inches, and the other a high speed spindle for drilling holes in the range of about 0.003 to 0.125 inches. The high speed spindle includes a stationary spindle body carrying the stator of the rotary drive motor.

Abstract: A drilling machine operable to drill holes in desired patterns and diameters in circuit boards and similar items and the machine is provided with a base upon which a planar support is movable parallel to the base respectively in directions transverse to each other by power mechanism, an elongated support mounted above the planar support in parallelism therewith and at least one turret-like head is rotatable about the axis of and is supported by the elongated support.

Abstract: Tapping apparatus comprising: a body (5) suitable for being mounted on a moving element (4) of a press; a system of multiplying gears (14) having their axes parallel to the direction (F) of motion of said element, and placed on said body; a motion transforming device having a large pitch screw (26) and nut (27) for transforming the linear stroke of said element into a rotary motion which is applied to a first gear wheel of the system; and a tapping head (18) which is rotated by the last gear wheel (17) of the system and which is driven in translation by the body, said head comprising a fixed casing (32), a spindle (36) which pivots in said casing and is rotated by the last gear wheel (17) and a tool-carrying clamp (51) which is rotated by the spindle and which is capable of longitudinal displacement against pneumatic return means (F.sub.d) of adjustable force.Applicable to machine tools.

Abstract: In an automatic fastening machine comprising a frame, drilling assembly carried by the frame for drilling a fastener receiving hole in a workpiece and an arrangement carried by the frame for installing a fastener in the hole drilled in the workpiece, the drilling assembly comprising a drill spindle having an axis of rotation and a drilling tool at one end thereof and rotatably mounted in a ram movable on the machine frame toward and away from the workpiece, the improvement of a brushless synchronous a.c. servomotor including an output shaft having an axis of rotation and an arrangement for connecting the motor directly to the drill spindle with the axis of rotation of the motor shaft coincident with the axis of rotation of the drill spindle. There is also provided a fan on the frame and positioned to direct cooling air onto the motor.

Abstract: A device for simultaneously tapping threads and performing the usual operations of a punch press is described in which the tapping device is attached to the upper and lower plates of a punch press. As the punch plates are brought toward and away from each other, gear trains and helically grooved lead screws change the up and down motion into rotating motion. The gear trains also change the speed of the rotating motion which is used to drive a thread tapping tool through the metal being formed in the punch press. If there is too much force opposing the tapping operation, an electrical contact in the device is opened and the punch press stopped before the tap or tapping device can be damaged.

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: Drilling apparatus is adapted for use with a computer controlled plotter to selectively use the plotter as an automatically positionable hole drilling device. A drill motor of the drilling apparatus is carried and manipulated by a carrier mechanism of the plotter in a manner similar to that in which a conventional plotter instrument is manipulated. A coupling apparatus is attached to the carrier mechanism for the purpose of selectively mechanically connecting to and establishing a pneumatic seal for supplying pressurized gas to operate the drill motor. An alignment apparatus is connected between the carrier mechanism and the drilling apparatus to position an axis through the drill bit of the drill motor orthogonal to the plotter table. An actuator apparatus moves the drill motor toward the plotter table to drill holes in the material positioned on the plotter table.

Abstract: Disclosed is a structure for installing a multispindle attachment on a drilling machine or the like. An upper gear coupling member is secured at the lower end of a quill housing a main rotary spindle for a drilling machine, etc. A clamp member is rotatably provided on the gear coupling member. A lower gear coupling member for engaging with the upper gear coupling member is secured on the upper surface of the multispindle attachment installed at the lower end of the quill. Both of these gear coupling members are tightened and secured by means of the clamp member while both of the upper and lower gear coupling members are engaged with each other.

Abstract: A high-speed driving adapter for boring, milling and similar machine tools has a gear housing fixedly connected to a spindle housing of the machine tool. The gear housing rotatably supports a drive shaft having a taper shank disposed in a conical receiving bore in the machine tool spindle. A bearing sleeve is secured to the drive shaft and a tool-receiving spindle is rotatably supported therein and has a conical receiving bore coaxial with the drive shaft for the taper shank of a tool. A sun-and-planet gear arrangement is provided between the drive shaft and tool-receiving spindle. A collet carrier having a center ejecting pin and a collet is axially movable in a coaxial bore in the tool-receiving spindle, the collet having claws which engage an annular groove at an end of the tool taper shank. Several cup springs are arranged concentrically with respect to the collet carrier and urge the collet carrier away from the receiving bore.

Abstract: A hand-held electric tool comprising an elongated housing having a first longitudinal axis and provided with a motor-driven chuck projecting from the forward end thereof, an elongated grip having a second longitudinal axis and connected at its forward end to the rearward end of the housing. An electric motor is positioned within the housing for rotatably driving a suitable bit held in the chuck to perform fastening or drilling operation. The grip is connected to the housing in such a way as to be selectively switched between two positions, that is, a straight position where the first and second longitudinal axes are in alignment and an angled position where the first axis crosses the second axis. In the preferred embodiment, the grip and the housing are pivotally interconnected at a pivot axis to permit the grip to swing about the pivot axis between the straight and angled positions.

Abstract: A thread cutting tool having an electric motor which is accommodated in a housing and, by means of at least one worm gearing, drives a holder ring which is rotatably mounted in a head ring. The electric motor has a speed of greater than 25,000 rpm. The worm-gear toothing of the holder ring has a modulus of less than approximately 1.6 mm. Due to the high speed, the electric motor can be very small, so that the thread cutting tool can be easily handled, and can have a low weight. Due to the low modulus, the high speed of the electric motor can be reduced to the operating speed of the holder ring without it being necessary that the worm gear have a large diameter.

Abstract: An angle-drive head of a dental handpiece with the housing thereof removable. A speed-increasing pinion is provided for meshing with a drive pinion of the angle-drive. A shaft connected to the pinion extends axially in the head and has a speed-increasing pinion for developing a greater speed. A speed-increasing device removably coupled to the head has a third speed-increasing pinion and a fourth pinion is coupled thereto. A tool-receiving jaw is provided in the device for coupling to the fourth speed-increasing pinion for being rotationally driven therefrom.

Abstract: The improved power tool includes a housing having a motor located in the housing and a rotatable tool drive shaft projecting from the housing. A torque reaction bar is attached to the housing and is engageable with a stationary object to prevent rotation of the housing relative to a threaded fastener or the like being operated upon. A tool handle rotatably encircles the housing permitting the positioning of the handle in any desired position relative to the housing and, due to the swivel or pivoting relationship, preventing the imposition of torque on the handle.

Abstract: A keyless chuck gripping device for opening or closing jaws of a chuck of a rotary tool without using a chuck key includes a first portion having a surface extending at least partially around an outer surface of a chuck locking drum. The first portion is attached to a forward housing portion of the rotary tool or the outer surface of the chuck locking drum. A second portion connected to the first portion is urged into frictional or lock engagement with the unattached portion of the rotary tool where manual actuation alters rotational speed of the chuck locking drum relative to the speed of the rotary tool shaft. The second portion maintains the chuck locking drum in a stationary position while the shaft is driven by the motor, enabling the chuck locking drum to turn the chuck jaws in forward or reverse direction.

Abstract: A servo system for the rotary spindle of a machine tool in which the spindle is driven by a drive motor through a gear train having shiftable gears for changing the rate of rotation of the spindle. The transducer for the servo system is mounted directly on the motor drive shaft in order to avoid all backlash between the resolver and the drive motor. However, the transducer is arranged to regulate the angular orientation of the spindle and must therefore be maintained in synchronism with the spindle. This is accomplished by arranging the shiftable gears so that when they are moving into engagement with a new gear, engagement with the previously engaged gear is maintained until initial engagement with the new gear is achieved. Further shifting movement into full engagement with the new gear operates to release the previously engaged gear. Thus, during the initial engagement with the new gear, the shiftable gear is momentarily in engagement with both gears.

Abstract: An apparatus for converting a power chain saw into a boring tool is disclosed and consists of an adapter housing which is detachably mounted onto the free end of the saw's chain guide. The housing includes a rotatable shaft mounted therein and extending therethrough with a sprocket fixedly mounted onto the shaft within the housing. A chuck is mounted on the shaft for securing a boring tool thereon. The sprocket is driven by a chain which is in communication with the motor of the chain saw.

Abstract: The drill includes the usual tool spindle driven by reversible motor, and conventional chucking jaws which rotate with the spindle. The jaws are surrounded by an actuator which is drivingly connected to the jaws, and normally rotates with the jaws when the drill is in use. A manually operable control member on the housing is movable between two operating positions in each of which it holds the actuator against rotation, and consequently causes the spindle to move the jaws to bit-locking or bit-releasing positions, depending upon the direction or rotation of the spindle. Whenever the control member is moved from one to the other of its positions it switches the direction of rotation of the motor.

Abstract: A chuck brake is secured to a hand-held reversibly rotatable drill of the variable speed type having a chuck. The chuck brake permits selective tightening or loosening of the chuck by operation of the drill. Brake shoes surround and are adapted to engage at least a portion of the peripheral surface of a housing of the chuck, being secured to the front of a drill on opposite sides of the chuck. The brake shoes are manually engageable by pinching action of the user for movement between a first position permitting free rotation of the chuck housing and a second position providing friction between the brake shoes and a first area of the chuck housing. In the second position, rotation of the chuck housing in one direction is impeded, as for tightening. The brake shoes are shiftable also toward the drill to a third position in which increased friction with the chuck housing is provided to impede rotation of the chuck housing in an opposite direction, as for loosening of the chuck.

Abstract: A speed control device for portable power tools having particular applicability to electric drills. The speed control device is adapted to automatically adjust the speed of the motor in accordance with changes in the diameter of the tool bit used. The device includes a sensor that senses the opening and closing of the jaws of the chuck. The sensor is mechanically coupled to a potentiometer circuit whose output signal is varied in accordance with movement of the sensor. The output signal of the potentiometer circuit controls the firing angle of a thyristor 34, which in turn controls the current supplied to the motor. In addition, the preferred embodiment includes a speed select switch which is connected to the potentiometer circuit to set the appropriate speed range for the motor, given the particular type of work material.

Abstract: A screw fastened clamping neck attachment for an electrical hand operated drill. The electrical motor of the drill is of the neckless type and has a short rotary shaft extending from the housing. The screw fastened clamping attachment is in the form of two semi-cylindrical bushings adapted to be clamped together at their base portion to form a neck, these bushings, in clamped condition, encasing an extension shaft therebetween which is to be connected to the short shaft of the electrical motor. Preferably the extension shaft has a connecting sleeve end threaded internally with the short shaft threaded externally to provide a threaded connection. Bearings are provided for the extension shaft of the attachment within the semi-cylindrical bushings. Fastening arms extend rearwardly from the bushings to support the attachment on the housing and to resist torsion.

Abstract: A breast drill including a casing of elongate hollow form containing gearing for transmitting drive to a drill chuck, and a grip handle connected to the casing and capable of angular adjustment around the casing so that it can be located at a required position in relation to the position of a crank handle which can be turned to transmit drive to the chuck.

Abstract: In a preferred embodiment, a drill gas turbine motor in which the housing structure directs pressurized gas both radially inwardly and axially along the longitudinal axis of the elongated housing, against vanes arranged along a circumscribing surface of the revolvable (rotatable) rotor mounted within rotor space within the housing to effect rotation of the rotor, and a drivable shaft extending from an opening at one end of the housing, and a dampening-spring mechanism at an opposite end of the housing and rotor arranged to dampen pressure and movement of the rotor in a direction away from the end of the drivable shaft thereby reducing wear on bearings supporting the rotar at opposite ends thereof, together with brake mechanism for manually exerting braking pressure against the rotor, and key mechanism for locking the rotor in a non-revolvable state during change of chuck on the drivable shaft, and the drivable shaft having formed in a distal end thereof a female receptacle receivable of a male end of a chuck.

Abstract: The present invention relates to an improvement in a mechanism wherein a flywheel which is idly mounted on a spindle of a machining center is easily and speedily connected with or detached from the spindle by a clutch which is fitted on the spindle adjacent to the flywheel for promoting the cutting efficiency by providing spindle inertia of two kinds; one kind for heavy cutting and another for light cutting respectively.

Abstract: A multi-spindle drill head for use with a machine drive, comprises a main assembly, comprising a first housing member having at least one main spindle which is rotatably supported therein and which is adapted to be connected to the machine drive. A main gear is affixed to the main spindle for rotation therewith and it drives one or more secondary gears on secondary spindles. Each secondary spindle contains a drive pinion which becomes oriented in meshing engagement with a connecting gear which is rotatably mounted on a second housing part which is adapted to be fastened to the first housing part. The connecting gear is rotatably mounted in a position to drive a pinion of a drill spindle. The main spindle itself may contain a lower portion with a drive pinion which may be engaged with a connecting gear to drive the pinion of the drill spindle.

Abstract: A process and apparatus for drilling holes in hard materials in surgical procedures, comprising driving a drilling tool with a movement of alternating rotation with an amplitude of less than one revolution. The tool can be driven from a motor having unidirectional continuous rotatable movement through a convertor which transforms this movement into the alternating rotation. The drilling tool can covered by a member which feeds the waste cutting materials rearwardly into an enclosed chamber. The apparatus can also be provided with a member that covers the drill during an insertion thereof through cut tissue prior to the drilling operation.

Abstract: A rock drilling machine, e.g. for drilling with a diamond core bit, has a first power rotated chuck for gripping the drill string. The first chuck can be swung offset the drilling axis into a position to grip an input shaft of a reduction gearing coupled to a second chuck. The first chuck and its motor can thus rotate also the second chuck which is used for example for drilling down a borehole lining pipe. The two chucks are mounted on a common slide that is power feedable back and forth along a feed beam or mast.

Abstract: A tapping machine is herein disclosed. The tapping machine includes a base. A frame is connected to the base. A movable drive assembly is movably connected to the frame. A cutter is connected drivingly to the movable drive assembly. The base is adapted to engage a gate valve, or the like. In operation the drive assembly moves along the frame to bring the cutter through the gate valve into selective engagement with a pipe which is to be tapped.

Abstract: An electric drill is disclosed having a tool housing, and a power shaft within the housing journaled for rotation. The tool can perform several different functions together or alternatively and includes a jaw closing function, a drilling function, a hammering function, an extracting function and the like. The application is also concerned with an automatic means for going from one function to another either automatically by the rotation of a shaft or in response to the extent to which a trigger on the tool is depressed inwardly toward the tool housing.

Abstract: An electric motor driven drill and a battery therefor are mounted within a toolholder for a machine tool. The battery is coupled to the motor through a centrifugal switch which closes when the toolholder is rotated about its axis above a predetermined speed and opens when the rotary speed of the toolholder falls below the predetermined speed. The toolholder is mounted in the spindle of a machine tool and the drill turns on when the spindle is rotated and turns off when the spindle stops, the rotary speed of the spindle being added to the rotary speed of the drill in one direction of spindle rotation and subtracted from the rotary speed of the drill in the opposite direction of spindle rotation.

Abstract: Tapper comprising a rotatable tapper main body, a positive rotation transmitting element and a reverse rotation transmitting element disposed in the main body, a holder member disposed in a lower portion of the main body, a driven shaft for holding a tap supported by the holder member and rotatable in positive and reverse directions, and a clutch ring for switching the direction of rotation mounted on the driven shaft. The axial displacement of the driven shaft brings the clutch ring into engagement with the positive rotation transmitting element or the reverse rotation transmitting element selectively to rotate the driven shaft in positive or reverse direction. Each of the clutch and the reverse rotation transmitting element is axially movably supported by a spring for absorbing an axial impact load to be exerted on the driven shaft when the direction of rotation is switched.

Abstract: This invention relates to a machine tool which utilizes individual tool modules of a uniform size which can be attached to and operated by a spindle wherein a tool module is provided having the capability of boring holes which are larger than the module itself yet the module assumes a uniform size with other like modules for storage.

Abstract: An electric hand tool is disclosed which uses nickel-cadmium type cells to energize a small motor driving the tool. The speed of the motor is reduced by means of an epicyclic gear, requiring no increase in the diameter of the hand tool.