Abstract: Disclosed is an integrated tapping and drill attachment which includes a predetermined tapping configuration or mode which provides the desired flexibility for tapping, and also a predetermined drilling configuration or mode which provides the desired concentric and axial guidance as well as the desired rigidity for drilling operations.

Abstract: A tool accessory used to apply different volumes of a cutting fluid to the tap under CNC control by causing the machine to undergo different pump cycles in which the rotational speed of the tool is increased above the tapping rotated and then quickly returned to the tapping rotation. The tool includes a tapping head, a reservoir filled with cutting fluid, a centrifugal force-reactive pump and at least two discharge nozzles. The pump includes a plurality of biased piston springs that are forced outward and store centripetal force when the tool is rotated at speeds above normal tapping speed. When the rotational speed of the tool is reduced, the piston springs overcome the centrifugal forces and force cutting fluid through the discharge nozzles. The volume of cutting fluid discharged is controlled by adjusting the viscosity of the cutting fluid, the tool's maximum speed, by using different size discharge nozzles, and by using different pump cycles.

Abstract: A tapping unit (1) includes a protection device (12) for permitting an axial retraction movement of a master screw (4) towards the interior of a casing (2) from a reference position into a first proximal backward position with a first defined penetration stroke during which a first elastic return device (13) constantly returns the master screw (4) to its reference position. The protection device (12) furthermore permits an additional axial retraction movement of the master screw (4) towards the interior of the casing (2) from the proximal backward position into a second proximal backward position with a defined penetration stroke during which the master screw (4) is no longer returned towards the exterior of the casing (2).

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: A rotary drive adapted to perform a speed of rotation switching of a tool holding device, comprising an output drive shaft bearing the tool holding device, said output drive shaft being able to be moved into first and second axial positions by means of a setting drive. The output drive shaft is coupled in the first axial position with a power driven first drive gear wheel and in the second axial position with a concentric tubular shaft, which is adapted to be driven by a power driven second drive gear wheel by way of a worm drive.

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 transmission is disclosed for rotating the work supporting chuck assembly of a power driven threading machine at low and high speeds. The transmission includes a sun gear, a ring gear coaxial with the sun gear and axially shiftable between first and second positions relative to the sun gear and to a fixed clutch component, and a plurality of planet gears between the sun gear and ring gear. The sun gear is motor driven to provide the transmission input, and the planet gears are connected to and drive an output sprocket wheel drivingly connected to the chuck assembly. The first position of the ring gear provides clutched interengagement thereof with the sun gear for rotation therewith, whereby the planet gears rotate therewith to rotate the output sprocket wheel at a first speed equal to the speed of rotation of the sun gear.

Abstract: A two-speed gear box for handheld electric drills and the like has the movable parts associated with gear changing on or associated with a lay shaft. Gear changing is preferably effected by moving a pair of dogs, slidably mounted in holes through a lay shaft gear, to drivingly engage in either of two dog clutch members on the lay shaft. A thin flexible arm, preferably including a ring around the lay shaft, mounted in cantilever fashion from a movable base effects movement of the dogs. Should the dogs not be in proper register with a respective dog clutch member when changing speed, then the arm flexes and urges the dogs into driving engagement when proper register occurs. A family of two-speed drills having different specialized functions, e.g. a drill, a hammer drill, a screwdriver/drill, a screwdriver, etc., can be produced with the maximum parts in common enabling greater manufacturing flexibility and lower cost of manufacturing the family.

Abstract: In a multipurpose machining unit with pneumatic spindle feed, driving is performed, starting from a motor unit (12), directly or via a flexible shaft (9). An interchangeable gear set (4) makes it possible to select the number of revolutions of the tool in accordance with its purpose. In this connection, for simultaneous use, an arbitrary number of gears (5, 6) is provided. The gears (5, 6) of the gear set (4) can be plugged together in coaxial series. The driven side of the motor unit (11) can be plugged together with the machining unit directly or by way of at least one gear (5, 6) or by way of a connecting coupling (8) for a flexible shaft (9) into a rotational connection. With the use of such a machining unit, individual spindles can likewise be operated economically.

Abstract: The present invention provides apparatus which can be incorporated into a powered instrument that rotates a tool at varying rotational speeds and torques. The invention includes at least two drive plates, each of which rotates at a different speed and which exerts a different magnitude of torque. A movable member within the instrument selectively engages one of the two drive plates to couple that drive plate to the output shaft of the instrument. The apparatus can include a torque limiter which couples the input shaft to the output shaft only when the resistance to rotation offered by a drive plate is less than a predetermined value.

Abstract: A tapping attachment for a machine having at least one rotating workpiece spindle and associated coaxial tool drive shaft. The tapping attachment couples a tapping tool to the drive shaft in a manner selectively controlling the tool to rotate with respect to a workpiece attached at one of two predetermined velocities in the same direction as the spindle. The attachment is selectively adapted so that one of the two velocities is above and the other below that of the spindle.

Abstract: A portable positive feed drilling device in which there is a spindle carrying a cutting tool with means for rotating the spindle and the cutting tool in order to perform a cutting operation on the work, and in which there is a normal speed spindle feed means and a rapid advance spindle feed means, either of which may be caused to feed said spindle toward said work.

Abstract: There is disclosed a spindle unit for machine tools in which the spindle is rotated by a change speed mechanism comprising a drive sleeve splined and slidable axially in the spindle and a gear shift sleeve slidable with the drive sleeve and having a bull gear adapted in one position to engage a driving gear driven by a motor and in another axial position to cause a clutch element to engage a companion clutch element connected to a pulley also driven by the motor. There are pneumatic means for moving the sleeve to cause the bull gear to disengage said drive gear to free the spindle for independent hand rotation when setting up or adjusting the mechanism. The spindle driving means includes gear shift means to cause the drive sleeve and spindle to selectively rotate at high speed, low speed or be in neutral.