Abstract: A power-operated hand-held power tool, in particular a power tool comprising an oscillation drive for driving a tool in an oscillating manner, comprising at least one sensor for detecting vibrations and comprising a controller which is coupled to the at least one sensor to control at least one operating parameter of the power tool according to an output signal of the at least one sensor, the power tool being configured to receive different tools, and the controller being configured to evaluate the output signal of the at least one sensor and preferably to compare the output signal with stored characteristic values for the vibrations of different tools so as to control at least one operating parameter of the power tool according to said comparison, is specified.

Abstract: A direct-current motor is disclosed, preferably in the form of an EC motor, which has a matching arrangement in order to vary its rotation-speed/torque characteristic, having a permanently effective control circuit for controlling the motor, which control circuit is programmed such that the rotation-speed/torque characteristic is permanently varied with respect to rated operation or operation with the matching arrangement.

Abstract: An oscillating tool comprises a housing that accommodates a motor which for driving a tool is coupled with a drive shaft via an oscillation drive, for driving it about its longitudinal axis rotatingly oscillatingly. For reducing vibrations, there is provided an inertial mass that is movably held on the housing via at least one spring element.

Abstract: A method and a charging device serve for charging rechargeable lithium accumulators. A charging current is injected into the accumulator, and the voltage is monitored on the accumulator during the injection process. Additionally, the variation in time of at least one state variable characteristic of the accumulator is monitored and injection of the charging current into the accumulator is continued until the variation in time of the state variable exceeds a predefined limit value.

Abstract: A power-operated hand-held power tool, in particular a power tool comprising an oscillation drive for driving a tool in an oscillating manner, comprising at least one sensor for detecting vibrations and comprising a controller which is coupled to the at least one sensor to control at least one operating parameter of the The power tool according to an output signal of the at least one sensor, the The power tool being configured to receive different tools, and the controller being configured to evaluate the output signal of the at least one sensor and preferably to compare it with stored characteristic values for the vibrations of different tools so as to control at least one operating parameter of the The power tool according to said comparison, is specified.

Abstract: A direct-current motor is disclosed, preferably in the form of an EC motor, which has a matching arrangement in order to vary its rotation-speed/torque characteristic, having a permanently effective control circuit for controlling the motor, which control circuit is programmed such that the rotation-speed/torque characteristic is permanently varied with respect to rated operation or operation with the matching arrangement.

Abstract: An oscillating tool comprises a housing that accommodates a motor which for driving a tool is coupled with a drive shaft via an oscillation drive, for driving it about its longitudinal axis rotatingly oscillatingly. For reducing vibrations, there is provided an inertial mass that is movably held on the housing via at least one spring element.

Abstract: The invention discloses an accumulator/device combination and an accumulator. In the case of the combination, the unit is connected to the accumulator via at least one current supply line. A device operating switch is arranged in the device. A monitoring unit is arranged in the accumulator. The monitoring unit comprises electronic circuit for detecting an alarm condition in the accumulator. The electronic circuit are interactively connected with the operating switch.

Abstract: A method and a charging device serve for charging rechargeable lithium accumulators. A charging current is injected into the accumulator, and the voltage is monitored on the accumulator during the injection process. Additionally, the variation in time of at least one state variable characteristic of the accumulator is monitored and injection of the charging current into the accumulator is continued until the variation in time of the state variable exceeds a predefined limit value.

Abstract: The invention provides a position finding system and a method for locating the position of a tool, in particular a hand-held screwdriver, wherein free-field position finding is performed for determining the absolute position of the tool and wherein relative position finding is performed for determining the relative position of the tool by tracking the movement of the tool relative to a known reference position, and combining the results with the result of the free-field position finding process for determining the position of the tool.

Abstract: A hand-held power tool, in particular an electric tool is disclosed, comprising a housing in which a motor is received for driving a tool, further comprising a damping system for actively influencing the vibration behavior, wherein the damping system comprises at least one damping element and a sensor that emits an electric sensor signal when deformation occurs, which signal is supplied to an electric circuit that generates therefrom a control signal which is supplied to an actor at a given phase angle relative to the sensor signal.

Abstract: A retarded electric motor designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as series motor or as asynchronous motor. If configured as a series motor, the valve (S1, S2, S3) allows to bypass the armature and to operate the motor as an externally excited direct current generator when switching into braking operation. If configured as an asynchronous motor, a switch is utilized to disconnect at least two field windings from mains. A valve is utilized to excite the motor externally from mains with a pulsating direct current during braking.

Abstract: A retarded electric motor is disclosed which may be designed as a series motor or an asynchronous motor having a squirrel cage rotor. A valve means is provided for switching between motor operation and braking operation. During motor operation the motor is operated in a known configuration as series motor or as asynchronous motor. If configured as a series motor, the valve means (S1, S2, S3) allows to bypass the armature (12) and to operate the motor (10) as an externally excited direct current generator when switching into braking operation. If configured as an asynchronous motor, a switch is utilized to disconnect at least two field windings from mains. A valve means is utilized to excite the motor externally from mains with a pulsating direct current during braking.

Abstract: A series-wound motor is disclosed which is particularly suitable as a universal motor for an electric power tool. The motor comprises a stator with at least two field poles, each having two pole horns. At least one of the pole horns of each pole comprises first and second protrusions extending circumferentially from an axial edge of the pole horn. Sparking is reduced thereby. Also a retarded motor is disclosed, wherein each pole comprises a pole horn having a run-on edge, and further comprises a pole horn having a run-off edge. The pole horns having run-off edges are shortened in circumferential direction compared to the pole horns having run-on edges or comprise at least one cutout section extending in circumferential direction. The motor can be switched between a motor operation and a brake operation, without the need for providing commutating windings or additional coils to avoid excessive sparking.

Abstract: The invention relates to a housing for electronic units having printed circuit boards and heat sinks attached to said printed circuit boards. The housing comprises side walls formed by a first and a second u-shaped-section each having a central portion and a first and a second side cheek extending perpendicularly to the central portion. The u-shaped-sections extend into each other with clearance along longitudinal edges of the side cheeks. The central portions of the u-shaped-sections are connected to opposite end faces of the heat sinks. This results in an inexpensive construction with stability in dimensions. The heat transmission between the heat sinks and the housing is good.

Abstract: A machine for automatically distributing piston rings and spacers into the grooves of a piston is disclosed. The machine comprises magazine tubes onto which stacks of the spacers and rails are threaded. The machine further comprises a widened bore in which the piston is seated as rails or spacers are automatically released from the tubes and threaded into the piston grooves.