US 4,544,866 AGranted

Remote window operating system

AssigneeAmerock Corporation

InventorsRichard R. Clemmons, Darrel E. Zimmer, Stephen H. Sanders, III

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Abstract

A window operating system includes a motor control circuit for controlling the operation of direct current permanent magnet motors mounted on window operators associated with each window. Each of the motors on each of the windows is connected to the control circuit only by a pair of wires which both power the motor and provide information to the control circuit as to the status of motor operation. The status of motor operation is determined by monitoring the back electromagnetic force expressed by the motors. To help differentiate back electromagnetic force from supply voltage supplied to the motors, the motors are supplied with full rectified alternating current power, rather than simple direct current, so that the presence or absence of zero voltage between half waves of the voltage expressed across the motors can be monitored to determine the absence or presence of back electromotive force during those time periods. A reversible connector is used to connect the motor to the control circuit so that the polarity of motor operation can be reversed by reversal of the connector relative to its mating receptacle.

Claims7

Dependent claims

A remote window operating system comprising

a direct current motor connected to operate the window, the motor opening and closing the window depending on the polarity of the voltage applied to the motor;
a diverse condition sensing device associated with the window to electrically sense a desired condition, the sensing device connected to the motor by two conductors;
a control circuit module for operating the motor by applying voltage of a selected polarity to the motor depending on user input and on the output of the sensing device;
a cable of four conductors connecting the motor to the control circuit module, two conductors each for the motor and the sensing device;
a four conductor connector receptacle on the control circuit module;
and
a four conductor connector attached to the cable to connect the cable to the control circuit module by connection to the connector receptacle, the conductors on the receptacle and the connector arranged to be reversibly symmetrical so that the connector can be inserted in the receptacle in either of two reversed configurations, each configuration corresponding one direction of rotation of the motor for a given polarity of voltage so that the polarity of voltage causing window opening and closing can be selected by selection of one of the configurations of the connector.

4 more elements

Dependencies are inferred from the claim text.