Abstract: An electrical hand tool device (2) comprises a control electronics (8) and a transmitter and receiver (10) which is responsive in a wireless and contact-free fashion, and with a storage medium (12) in which an authorization code is stored, wherein an operation locking state and an operation release state can be differentiated, and with an external transmitter and receiver means (16) which is accommodated in a separate portable device (4), wherein communication with the transmitter and receiver means (10) of the electrical hand tool device can be produced in a defined fashion through actuation of the external transmitter and receiver means (16) to change the operation state, and communication is provided only to change the operation state and optionally to change the authorization code.

Abstract: A tensioning nut to secure a disk-shaped tool (6) is threadable onto the threaded spindle (5) of an electric tool, particularly an electric hand tool with run-out brake such as a right-angle grinder. The nut includes a nut body (1) provided with a corresponding thread, with a coaxially-positioned pressure ring (3) that may be tensioned with the disk-shaped tool (6). An axial bearing (9) is positioned between the ring (3) and the nut body (1). The nut further includes a blocking disk (8) within the nut body (1) for preventing rotation of the pressure ring. At least one blocking body (16, 18) is positioned between the blocking disk and the surrounding wall (14, 19) of the nut body (1). This blocking mechanism forms a uni-directional coupling, whereby a disengagement exists between the nut body (1) in its tensioning direction and the blocking disk (8), and locking occurs between both of them in the opposing direction of the nut body (1) relative to the blocking disk (8).

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: A mains braking device for a line-powered power tool includes a circuit arrangement with a two-pole switch which switches between the motor mode and the braking mode. The inventive braking device further includes an electronic power circuit breaker or triac which is connected in series to the commutator motor of the power tool and with control electronics allocated to the triac. For the safe recognition and initiation of the mains braking mode, the control electronics is provided with devices for differentiating between the motor mode and the mains braking mode. The mains braking device is especially useful for power tools such as right angle grinders, hand-held buzz saws and the like which are provided with dangerous tools.

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.