Abstract: A feed unit for drilling and/or tapping comprising a housing, a quill in the housing movable between retracted and extended positions, the quill rotationally supporting a spindle for carrying a rotary tool, a screw for moving the quill between said positions, a ball spline shaft in the housing coaxial with the spindle, a ball spline nut having recirculating steel balls rolling in raceways on the ball spline shaft, the spindle radially supporting the ball spline shaft within the quill with zero clearance through the ball spline nut, rotation of the ball spline shaft being imparted to the spindle through the ball spline nut.

Abstract: A positive feed drilling machine with a lubricant emitter. The drilling machine can have a pneumatic logic system that can automatically initiate retraction of a cutter spindle and cutting tool after a desired cutting stroke distance. Initiation of the retraction sequence can automatically shut off delivery of lubricant to the cutter tool.

Abstract: Disclosed is a core drilling machine, comprising a stand part for fixing the core drilling machine to a component, and comprising, on the stand part, a guide along which a core drilling unit is carried in a movable manner, the stand part having a stand housing, on an outside face of which the guide is carried, and the core drilling unit having an elongate machine housing, which is carried so as to be movable along the guide by means of a slide, and comprising a cable, which, together with a protective sleeve, is routed from the stand part to the core drilling unit, the cable being routed from the stand housing to the core drilling unit via a flexible protective sleeve and being carried on the core drilling unit by means of a swivelling rotary joint.

Abstract: There is provided a transmission device comprising a rigid casing configured to be mounted perpendicularly on a pair of parallel rotatable driving and driven shafts. Annular driving and driven gears are provided in the casing. The annular driving gear is adapted for rotating simultaneously with the driving shaft, and is also adapted for forwarding rotational motion of the inner section to a transmission device. The annular driven gear is adapted for engaging and rotating simultaneously with the driving shaft and sliding over the same, and for forwarding to the inner section rotational motion received from the transmission device. The transmission device is rotatively connected to the annular driving and driven gears for transmitting rotational movement of the driving shaft to the driven shaft. There is also provided a portable boring-welding apparatus using this transmission device and a method for rotating a driven shaft using a parallel driving shaft.

Abstract: The present invention relates to methods and systems for automatically feeding a feeding housing (206) of a drilling device (200). The drilling device (200) includes a drill stand (202), a drilling machine (204) and a feeding housing (206). Further, the drilling machine (204), which is suspended by the feeding housing (206), includes a drill with a drilling motor for performing a drilling operation through a drilling object. The feeding unit (208) includes an electric feeding motor for feeding the feeding housing (206) along the stand (202). Further, the feeding unit (208) also includes a controller for manually influencing the feeding motor's direction of rotation, speed and feeding force.

Abstract: A rolling bearing includes at least a first ring with an undulating rolling surface and a second ring, the rings being coaxial and given a relative rotational and reciprocating axial movement, and at least one row of rolling bodies mounted in rolling contact between the respective rolling surfaces on the rings. The rolling bearing further includes at least a third ring with an undulating rolling surface that collaborates with either the first row of rolling bodies or with a second row of rolling bodies, the second row of rolling bodies being inserted between the rolling surface of the third ring and a rolling surface of a fourth ring. At least one of the third or fourth rings is mounted to rotate as one with the first or second ring respectively, and the rings which rotate as one are mounted such that they can move axially one relative to the other.

Abstract: In this process for drilling a bore (61), a drilling tool (11) is driven simultaneously in rotation about an axis (A) and in translation along the axis (A) in accordance with an advance movement. The advance movement is combined with an oscillating movement of the drilling tool (11) along the axis (A) of an amplitude sufficient to break up the swarf formed, while at the same time keeping the drilling tool (11) in the bore (61) which is in the process of being drilled. In certain exemplary embodiments, the application may be relevant to the aircraft construction industry.

Abstract: The present invention relates to methods and systems for automatically feeding a feeding housing (206) of a drilling device (200). The drilling device (200) includes a drill stand (202), a drilling machine (204) and a feeding housing (206). Further, the drilling machine (204), which is suspended by the feeding housing (206), includes a drill with a drilling motor for performing a drilling operation through a drilling object. The feeding unit (208) includes an electric feeding motor for feeding the feeding housing (206) along the stand (202). Further, the feeding unit (208) also includes a controller for manually influencing the feeding motor's direction of rotation, speed and feeding force.

Abstract: The present invention relates to a machine tool for machining of workpieces, having a workpiece support for mounting the workpiece, a tool holder, which can be moved at least along one axis, for holding a tool for machining the workpiece, and workpiece holding units for fixing the workpiece during the machining, the workpiece holding units being arranged outside the workpiece support surface of the workpiece support, which is covered by the workpiece in the mounted state, and each having a holding element for fixing the workpiece. In order that also workpieces of greater diameter can be machined, the machine tool otherwise being of the same dimensions, it is provided according to the invention that the holding elements can each be moved, substantially parallel to the workpiece support surface, in the direction of the workpiece, in particular in the direction of a central workpiece axis, which runs perpendicular to the workpiece support surface, for the purpose of centering and fixing the workpiece.

Abstract: A device includes a tubular element, and a cutter spring-biased relative to the tubular element. In an unloaded configuration the cutter is displaced relative to the tubular element by a displacement distance, and when the cutter is in a loaded configuration the displacement distance is reduced. A first structure is longitudinally fixed relative to the cutter and rotationally engaged relative to the tubular element. A length of the first structure extends proximally in the unloaded configuration. A second structure is longitudinally displaceable relative to the first structure. In the loaded configuration, a driver engages and rotates both the first and second structures, and thus the tubular element and cutter together. Once the cutter breaks through the bone, the cutter spring-biased into the unloaded configuration, resulting in disengagement of the first structure from the driver to prevent rotation of either the tubular element or the cutter.

Abstract: A portable drill guide and method are disclosed for use primarily with hand held power drills having a pistol-type hand grip. The drill guide includes a mounting assembly and an operational guide assembly, the mounting assembly having a tool support bracket with a clamping band and resilient gripping limbs. The operational guide assembly includes a support arm bracket having the tool support bracket connected therewith and a support arm extending therefrom at an angle normal to the mounting assembly, a pair of interface guide posts with retainers, and an interface tensioning mechanism including a slotted two level shaft. An interface, a sufficient length of durable webbing or strap for example, is engagable around a workpiece and the guide posts beneath the retainers, and is operably associable with the tensioning mechanism.

Abstract: A drilling machine comprises a stand on which a carriage is guided and can be moved by a drive supported on the stand and engagable with the carriage for generating feed motion of the carriage along the guide. A drilling unit on the carriage includes a motor-driven spindle. An axially-fixed intermediate shaft on the stand engages the carriage and translates rotary motion of the intermediate shaft into linear motion of the carriage along the guide. The drive is engagable with the intermediate shaft for moving the carriage along the guide with a stepper motor. A lever is engagable with an axially-displaceable plunger for shifting the plunger between first and second positions corresponding to an engaged position and a disengaged position, in which the plunger allows for manual rotation of the intermediate shaft when rotating the lever.

Abstract: In this process for drilling a bore (61), a drilling tool (11) is driven simultaneously in rotation about an axis (A) and in translation along the axis (A) in accordance with an advance movement. The advance movement is combined with an oscillating movement of the drilling tool (11) along the axis (A) of an amplitude sufficient to break up the swarf formed, while at the same time keeping the drilling tool (11) in the bore (61) which is in the process of being drilled. In certain exemplary embodiments, the application may be relevant to the aircraft construction industry.

Abstract: Cutting apparatus having a ram axis gear tube (32) equipped with internal threads engageable with external threads (48) of a main shaft (42). A tool can be fixed to the main shaft (42). The external threads (48) of the main shaft (42) are formed on external splines (44). A main shaft rotation gear (46) has internal splines (41) mating with the external splines (44) of the main shaft (42). Rotation of the ram axis gear tube 32 thus causes the main shaft (42) to move axially via the internal and external threads. Rotation of the main shaft rotation gear (46) causes rotation of the main shaft (42). The tool fixed to the main shaft (42) can thus undergo axial and rotational movements. A motor (74) can be coupled to main shaft (42) and a motor shaft (63) extended through the ram axis gear tube (32) and the main shaft (42). The motor shaft (63) can drive a linear gear (68) of a cross slide assembly (24) and thus radially move a tool fixed to the cross slide assembly (24).

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 machine tool comprises a mounting member for attachment to a workpiece. The mounting member includes a bearing portion that has an external surface of circular cross section and is formed with an aperture in its external surface. A utility device has an internal peripheral surface that defines a cylindrical cavity for receiving the bearing portion of the mounting member in a manner that allows the utility device to move axially and rotationally relative to the mounting member. A clamp is actuable when the utility device is fitted to the bearing portion of the mounting member for releasably retaining the utility device against axial and rotational movement relative to the bearing portion. A spring-loaded detent member projects into the cylindrical cavity from the peripheral surface and is receivable in the aperture of the bearing portion for retaining the operating assembly against axial and rotational movement relative to the bearing portion in the event that the clamp is not actuated.

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 rotary cutting tool is described which includes a motor for moving the tool vertically into a surface to be cut. The motor is connected to the tool by a clutch which is most preferably a ball clutch selectively engageable to transmit drive. The clutch further moves out of engagement should a force between two clutch members exceed a predetermined slip force. This predetermined slip force is adjustable by adjusting a spring force which is applied to maintain the clutch members in the engaged position.

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: A motor driven flaring device in which a rotatable eccentric cone an apex of which defines a fixed center of rotation is pressed, while rotating, against an end of a pipe to be flared, including a body having a motor incorporated therein and having an output shaft to be connected to a drive source, a rotational drive shaft connected to the output shaft of the motor so as to relatively move in the axial direction thereof, a feed screw shaft member connected to the rotational drive shaft and screw-engaged by the body so as to rotate and move in the axial direction thereof, and a one-direction rotation transmission mechanism between the rotational drive shaft and feed screw shaft member for transmitting the rotation of the rotational drive shaft to the feed screw shaft member only in one direction.

Abstract: A boring apparatus wherein the size in the axial direction of the shaft of the manual handle horizontally supported can be made small-sized. A clutch is composed of spherical bodies, a cylindrical body having formed therein hole portions for receiving the spherical bodies, spherical body pressing means for pressing the spherical bodies to the outside or inside of the cylindrical body, and an engagement member having recessed portions engaging with the spherical bodies which are projected to the outside or inside of the cylindrical body, and the boring apparatus is constructed by using the clutch.

Abstract: Disclosed is a turret punch press in which tap holder assemblies TA are incorporated into the press body through tool lifters. Each of the tap holder assemblies TA is composed of a tap holding mechanism, a tap feeding mechanism and a tabular workpiece clamping mechanism formed on the same axis. At the same time, transmission mechanisms DA for selectively transmitting the torque from the press body to the tap holding mechanisms are incorporated into the press body. With a punch press having this construction, tapping can be performed on the same axis as punching.

Abstract: The invention relates to a torque-limiting clutch for use in combination with a positive feed drill that has a reversible motor and reversible driving means. A preferred use of the clutch is in combination with a drill that has a reversible motor rapid advance system. The clutch provides direct drive in a forward mode and is torque-limiting in a reverse mode so as to protect the gears from breaking due to excessive torque while the gears are turning in reverse during the rapid advance mode. In the reverse mode, the torque-limiting clutch protects the drill bit as it bears on the workpiece and prevents unscrewing of the drilling and mounting components. In a preferred embodiment the clutch is mounted on a shaft and is comprised of two clutch jaws that drive through lugs mounted on the jaws. The lugs provide direct drive in a forward rotation, but are shaped so as to allow the jaws to disengage when the torque is excessive in a reverse rotation.

Abstract: A boring apparatus has a rotary member rotated by a motor, a transmission shaft transmitting its rotation to an electric drill by means of a rotation transmission mechanism for reciprocally moving the electric drill on the frame of the apparatus. The transmission shaft is selectively connected directly to the rotary member and connected operatively thereto through a coupling which is rotated reversely to the rotary member through a reduction mechanism and is designed to be disengaged from the transmission shaft when the shaft is directly connected to the rotary member and to be engaged with the shaft when the shaft is not directly connected to the roatary member. The apparatus has a selecting member which directly connects the shaft to the rotary member and disengages the coupling from the sahft.

Abstract: A drilling machine operable by a single operator to tap into a pipeline includes an elongated boring bar to which a number of different tools such as drills and hole saws may be removably attached. The boring bar is positioned within a body tube allowing rotation of the boring bar relative to the body tube. The body tube is positioned within an internally threaded feed tube such that as the feed tube is rotated, the boring bar is advanced. Manual or automatic driving equipment is secured to the boring bar to rotate the tool. A clutch mechanically couples the rotation of the driving equipment to the feed tube to move the tool into the pipeline at a controlled rate. The clutch includes a feed nut threadably secured to the feed tube. Adjacent the feed nut is a clutch member slideably secured to the feed tube. A biasing member such as a wave spring is position between the feed nut and the clutch member.

Abstract: A positive feed drill having a spindle drive gear train and a spindle feed gear train, coupled to the drive gear train by side teeth on respective drive and feed coupling gears mounted on a common shaft, is provided with a spring between the feed coupling gear and a housing to bias the feed coupling gear against the drive coupling gear to feed the spindle forward as it drills. A positive stop prevents the spindle from feeding beyond a predetermined point, thus causing the feed coupling gear to be driven by the spindle. A slope on the faces of the side teeth engaging the drive and coupling gears in order to allow the feed coupling gear to ratchet over the drive coupling gear when the spindle feed reaches the positive stop.

Abstract: In a positive feed power drill having a spindle drive gear train and a spindle feed gear train, and having hydraulic (air) means for actuating a piston to disengage the feed gear train for automatic retraction of the spindle, provision is made for field alteration of a valve in the hydraulic system, and associated actuating mechanism, to automatically reverse the positive feed when the spindle has been driven either (1) a predetermined extent set by a nut on the spindle which engages an arm over a valve stem and pushes the valve stem to a reversing position or (2) to a predetermined stop when countersinking, at which time the spindle stops advancing, thereby causing the spindle feed gear to have a tendency to move upwardly in the spindle actuator housing.

Abstract: Dismountable machining apparatus for use at different work site locations, and having base means releasably attachable to a workpiece, and having a collar including an opening having a predetermined central axis and having attachment means, drive housing means connecting releasably with the attachment means, and defining a central opening in registration with said central opening of said portions, so that the drive housing means may be assembled and disassembled from said base member at a work site, drive sleeve means in the drive housing incorporating a central bore, drive transmission means for the drive sleeve means, and adapted to be coupled to a power source for driving the drive sleeve, an auxiliary drive connected to the drive sleeve, and driven in unison therewith, a machining bar member slidably received within the drive sleeve whereby the machining bar member may be rotatably driven by the drive sleeve, and may be axially slid therein, and being releasable, a feed housing and a feed sleeve member fo

Abstract: A positive feed drill having an elongated spindle mounted for reversible longitudinal motion in a drill housing. The spindle has an hexagonal cross-section with the apices of the hexagon being threaded. A toothed drive gear having a hexagonal aperture centrally thereof has a close sliding fit with the spindle and is mounted for rotating the spindle. A feed gear having a threaded aperture centrally thereof is in threaded engagement with the spindle apices and is selectively rotated at a different rotational speed than the drive gear to longitudinally advance and retract the spindle. A gear for driving the feed gear is pin-slot locked to a motor gear for longitudinal spindle advancement, and is pin-slot locked to the housing for rapid spindle retraction. A pneumatic circuit in cooperation with limit valves and stop members provides completely automatic drilling to an adjustable depth, a dwell, and a positive retract operation with an economy of pneumatic energy.

Abstract: Means for controlling the advance of a thread forming member include a unidirectionally driven constant speed spindle, with the spindle mounting a thread forming member. A lead screw and a nut threadedly mounted thereon have a thread in which the helix angle is sufficiently high that the nut is freely rotatable relative to the lead screw in response to axial movement of the lead screw. The lead screw or the nut is attached to the spindle. There are means for controlling rotation of the other of these two members independently of the member attached to the spindle and during unidirectional constant speed rotation of the spindle to thereby control axial movement of the spindle.

Abstract: A drilling and turning power head with an externally threaded spindle adapted to support and feed a tool. The spindle is supported in a cylindrical sleeve by means of bearings and is driven by pulleys and belts from a power axle coupled to a motor. An internally threaded feed hub is mounted on the spindle along with a releasably connected drive hub and both are rotated at different speeds by V-belts from the power axle. Axial feed of the spindle is brought about by the difference in the speed of rotation of the two hubs. Retraction of the spindle is brought about simply by disconnecting the drive hub from the spindle.

Abstract: A tap holder which is particularly adapted for use on a numerical-controlled machine is the subject matter herein. The tap holder includes an elongated shaft, which has a conventional tap collet on one end thereof. A tap holder body is rotatably and axially movably mounted on the shaft. The body is particularly adapted for connection to a tool holder of a numerically-controlled machine. A collar is mounted on the shaft. A pair of balanced springs is mounted on the shaft on opposed sides of the collar. Both springs are connected to the body to allow relative axial movement between the shaft and the body. A limited drive torque assembly drivingly connects the shaft to the body to drive the shaft at a torque which does not exceed a predetermined maximum amount.

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: A tool spindle is rotatably driven by a drive motor with the spindle being mounted axially movable in a feed and retraction stroke. The drive motor also rotates a lead screw through a drive train with the lead screw moving the spindle in the feed stroke upon engagement of nuts therewith and permitting spring retraction of the spindle in the retraction stroke when the nuts are disengaged therefrom. A clutch in the drive train transmits a normal rotational force therethrough to the lead screw during a normal tool feed stroke, but disengages and interrupts normal rotational forces therethrough upon an abnormal resistance to the normal tool feed stroke reacting reversely through the lead screw to the clutch. Such abnormal resistance to the tool feed stroke could result from a selectively preset stop or an unforeseen obstruction or a tool dulled beyond proper use.