Abstract: An appliance which, through motor-driven operation, is movable toward a closing edge, in particular, for use with window regulators and sliding roofs of automotive vehicles. For this purpose, the number of revolutions of the motor is permanently detected, with the number of revolutions of the motor being measured in successive measuring intervals. The number of revolutions is to be a measure of the force acting on the pane. Respectively the last four measured values are detected in a sliding register and are subjected to evaluation. For this purpose, first a start-up value is detected. The start-up value respectively is the third last measured value n.sub.i-3 if the difference D between the current measured value and the third last measured value does not exceed a predetermined differential threshold D.sub.max. For, in that case, the start-up value remains unchanged. Subsequently, the difference A is formed between the start-up value and the current value n.sub.i.

Abstract: A drive mechanism for windshield wiper systems on motor vehicles comprises a d.c. motor to be driven in at least two different speeds of operation. The motor includes a collector, a first and a second carbon brush substantially resting against the collector diametrically opposite each other, and a third carbon brush which rests against the collector between the first and the second carbon brush. The third carbon brush is set off at a particular angle relative to the second carbon brush. When the d.c. motor is operated in the first speed of operation the first and the second carbon brush is connected to the voltage source and when the d.c. motor is operated in the second speed of operation the first and the third carbon brush is connected to a voltage source.

Abstract: A fuel pump, comprises an electric motor mounted in a tubular housing which is formed with a tapered portion at the take-in side, and an impeller which is mounted adjacent the tapered portion of the housing on the armature shaft of the motor for rotation therewith. A disc-shaped wall concentrical of the armature shaft separates the impeller from the motor space and is formed, at its circumference, with a channel-shaped annular duct open toward the periphery of the impeller. The radially extending impeller blades are thereby enclosed between the tapered portion of the housing and the disc-shaped wall, and the fuel is guided radially into the annular duct.