| 摘要 |
A device for movable parts for closing openings in motor vehicles, having a reversible DC drive motor, a polarity reversing actuation switch located in the motor circuit for supplying a DC voltage to the motor circuit with a poling corresponding to the desired direction of rotation of the motor, a relay with a switch contact located in the motor circuit in series with the polarity reversing actuation switch, as well as a position detection stage, connected to the relay control circuit, for actuating the relay in a reference position of the movable part for the purpose of deactivating the drive motor by opening the switch contact. The relay is a DC relay which opens or closes the switch contact when a first or second voltage level is applied to its control circuit. An electronic relay actuation stage with storage behaviour is connected to the relay control circuit. The relay actuation stage is kept in the set state as a function of the position of the movable part when the polarity reversing actuation switch is closed until the movable part has left the reference position (Fig. 1).
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