Abstract: An electrical hand tool is proposed, whose handle, with is rotatably maintained on the motor housing, and has a maintenance opening. By means of this, the structural length of the hand tool is reduced, servicing is simplified and the production costs are lowered.

Abstract: The invention relates to a control system for a commutator motor which is operated by phase-fired control. Allocation of a first and second control device in a single operating state without transition makes it possible to obtain constant jolting rotation of said motor by continuously varied cutting of the half-waves into first and second area sections (8,7) of an alternative current voltage. The inventive type of control system can be used advantageously in electric screwing or drilling tools.

Abstract: An electrical hand tool is proposed, whose handle (10), with is rotatably maintained on the motor housing (4), has a maintenance opening (18). By means of this, the structural length of the hand tool is reduced, servicing is simplified and the production costs are lowered.

Abstract: The invention relates to a motor-driven hand tool for machining of workpieces, in particular planar workpieces, having a guide surface which can be placed on the workpiece to be treated, and a face milling cutter for processing which projects past the guide surface, and which has an axis of rotation extending perpendicularly to the guide surface.

Abstract: A motor-driven hand tool, such as an eccentric grinder, angular grinder or sander, with a removable grip; for easier handling of the tool. The tool is improved by providing the grip with a securing element, which is disposed in a manipulation region of the grip and is movable relative to the grip, in particular being rotatable, so as to manually mount or release the grip.

Abstract: The invention concerns a drill hammer having an air cushion percussion mechanism with which an energizing bushing (24) is disposed concentric to the drill tool axis (10) and forms a cavity (26) containing the air cushion in which a percussion piston (28) can move back and forth, and with a wobble drive device (34) for moving the energizing bushing (24) back and forth in the direction of the drill tool axis (10), the rotation element (36) of which driving the nutating disk (42) being disposed for rotational drive parallel to the drill tool axis (10) at a separation therefrom. In order to increase the smoothness of running of the drill hammer, a weight (50) is disposed under restrictive guidance for linear back and forth motion parallel to the drill tool axis (10) in response to the action of the nutating disk (42), at that side of the nutating disk (42) lying diametrically across from the energizing bushing (24).

Abstract: A charger for a rechargeable battery pack of a power tool includes a housing and a printed circuit board on which electrical components are mounted. The printed circuit board being mounted in the housing. The housing includes vent openings disposed below the printed circuit board and vent openings disposed above the printed circuit board.

Abstract: The present invention relates to an interchangeable battery for a battery-operated electric tool with a contact arrangement which, in order to charge the battery cell or cells by means of a charger having open counter-contacts, has at least a first freely accessible contact area per contact by means of which the battery can be connected to the counter-contact of the charger, the interchangeable battery is constructed according to the invention in such a way that it can also be charged by means of a charger with a screened contact region in that either the contacts of the battery are contact pins or blades which can be inserted into a contact region screened as far as a closely restricted aperture of a charger with screened counter-contacts or the contacts of the battery have a region screened by a wall which has such a wall thickness that the contacts with the entire wall can be inserted into the screened contact region.

Abstract: A universal motor which operates an electric tool is controlled by a phase-gating controller for determining variable rotational speeds. The phase-gating controller can be switched over to wave-packet-controlled phase-gating control mode in order to be able to switch over between a continuous speed-torque characteristic and pulsating operation.

Abstract: A drill chuck includes clamping jaws guided in openings inclined toward each other in a chuck body and displaced via a manually rotatable clamping sleeve and a blocking sleeve, which is axially displaceable and partially rotated in relation to the chuck body. The blocking sleeve can be connected with the clamping sleeve by being displaced into its axial end position. A spring operating in the circumferential direction between the chuck body and the blocking sleeve, which prestresses the blocking sleeve in relation to the chuck body in a direction corresponding to the closing direction of the clamping sleeve is provided.

Abstract: An apparatus is provided for attachment of a saw blade to the plunger of a jigsaw. The apparatus includes a clamping body and a clamping member which includes a lever which has an eccentric surface which bears against the saw blade. A tension spring utilizes the mechanical advantage of the lever to provide increased holding force on the saw blade.

Abstract: An apparatus includes a clamping body which includes a lever which bears against a saw blade inserted into the clamping body. A tension spring is connected to the lever and to the clamping body and the tension spring bears against a pin which is slideably mounted in the clamping body. The pin bears against the saw blade and moves the saw blade out of engagement with form-lock projections in the clamping body when the lever is moved to an unlocked position.

Abstract: A switching arrangement for controlling the rpm constancy between idling and full power of universal motors in electric tools has a phase-shift control (IC) which, for setting the set value, is connected at an output via an adjusting resistor with a tap of a voltage divider, and whose trigger output controls an electronic power switch disposed in the electrical circuit of the motor. In order to obtain an optimal readjustment of the load in the entire provided rpm range by means of such a switching arrangement, it is provided that between the tap of the voltage divider and the one output of the phase-control circuit (IC) at least one further adjusting resistor is provided, with which a preferably electronic circuit device is switched in parallel, which is controlled from a point in the voltage divider.

Abstract: In a quick-action clamping device for axially securing a disk-shaped tool, particularly a grinding wheel on a flange of a driven spindle that has a clamping part provided with a thread that can be screwed to the thread of the spindle. The disk-shaped tool is held clamped between contact surfaces of the flange and the clamping part whose spacing from one another can be changed. It is proposed to avoid complete release of the tension nut during spindle stop operation in that the tool is pressed against the flange by means of at least one additional holding surface via a spring force, and that this additional holding surface is connected to the spindle in a manner secured against relative rotation.

Abstract: A chuck has a chuck body and a clamping sleeve as well as tool clamping jaws which are held in oblique guides and which, by rotation of the chuck body, can be displaced relative to the clamping sleeve. It furthermore has a tightening device which has a compression spring, which acts in the direction of rotation, an intermediate ring acted on thereby which is rotatable with respect to the chuck body and the clamping sleeve, an unlockable locking member on the intermediate ring, and an outside, rotatable gripping sleeve having an inner stop for the intermediate ring.

Abstract: A gearwheel has a coaxial trough which is closed by a first lid to form an inner storage chamber for grease and is also closed by a second lid to form an outer storage chamber. The circumferential surfaces of the first and second lids sealingly adjoin the outer wall of the coaxial trough and each of the lids has a narrow groove for controlled metering of the grease.

Abstract: A motor-driven machine with integrated suction duct removal of chips drawn or sucked into the machine, comprising: a drive motor; a suction removal fan including a fan wheel connected to and driven by the drive motor, the fan wheel having a plurality of blades; an air guide housing within which the blades rotate, the air guide housing having an inlet and an outlet, and defining a front wall; a suction conduit associated with the inlet of the air guide housing the suction conduit serving to conduct air and chips to the air guide housing; and a disintegrating element situated at the inlet of the air guide housing and in communication with the suction conduit, and extending between the front wall and the blades, the disintegrating element being fixed relative to the air guide housing. The blades of the fan wheel extend axially, face the front wall and define a gap with the disintegrating element.

Abstract: A vibration-cushioned handle, to be clamped in at one end, is designed for an electrical tool or the like. The handle has a coupling at one end for firm attachment to the body of the tool, and a coaxial handle sleeve. At least one cushioned spring element is located between the sleeve and the coupling. The handle provides good reduction of vibration, and sufficient sturdiness of the handle connection on the other, while being of simple construction. To this purpose, the spring element has different spring rigidities, on the one side in the radial direction relative to the axis of the handle sleeve, and on the other side in the direction of a pendulous or Cardanic excursion of the handle sleeve, around a pole lying on their axis.