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Drive-circuit-for-power-operation-of-a-movable-part-of-a-vehicle-coachwork

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Drive circuit for power operation of a movable part of a vehicle coachwork

Details

Inventors: Mitterer, Erik;
Assignee: Webasto-Werk W. Baier GmbH & Co. (DT)
Primary Examiner: Schaefer; Robert K.
Assistant Examiner: Indyk; Eugene S.
Attorney, Agent or Firm: Craig & Antonelli

A control device for a motor-driven closure panel, for instance an automobile sunroof panel whose closed position is an intermediate position between an open, retracted position and another open, pivoted position, the circuitry for the reversible motor including an impulse relay operating a control switch in one of the two motor connections, the relay coil being connected in parallel to the motor and between the control switch and the pole reversing switch, a position-responsive switch cutting off the relay circuit whenever the panel moves out of its closed position and energizing the impulse relay whenever the panel reaches the closed position. An improved switch arrangement prevents the panel from being stuck in a position in which the reversible motor becomes inoperative.

DETAILED DESCRIPTION The problem which the invention seeks to overcome is to so improve the operating mechanism according to the said Patent that the above-described situation cannot occur, enabling the control winding of the impulse relay to receive a pulse even when the second switch is open.
According to the invention, the second switch has an additional contact which with the second switch when open connects the appropriate terminal of the control winding with the lead connecting the motor and the first switch.
If the above-described case now occurs, whereby the second switch is opened by overtravelling the closed position on operating the pole reversal switch, the control winding of the impulse relay can now receive a pulse via the electric motor winding which closes the first switch and supplies power to the electric motor.
This function is ensured due to the fact that the motor winding has a much lower resistance than the control winding of the impulse relay.
The remaining function of the operating mechanism according to U.
S.
Pat.
No.
1,345,197 is not affected by the proposal according to the present invention.

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