Multi-elmac Company

Kenneth F Umpleby

Maurice R Brackney

William C Apple

A control system for a power driven operator for garage doors and the like comprising an operator control circuit having a DC voltage source operating as the power supply for an electronic flip-flop device responsive to successively applied input signals to alternatively establish circuits of opposite direction through a reversible electric motor; i.e. one actuation causes the motor to run in one direction and the next actuation causes it to run in the opposite direction. The operator is subject to actuation by both a hard wired push button or an auxiliary device such as a radio receiver which is responsive to signals from a remote transmitter. The operator control circuit includes a feature which electronically prevents the simultaneous energization of the reversible electric motor in both directions. A further feature is a provision for de-energizing the operator motor control circuit relays after a period during which no actuation occurs, or after an interruption of the line voltage, the interruption being caused by a thermal switch or by external means. Still another feature is a provision to energize external devices such as garage lights for a period following actuation of the motor control.

Operator motor control

A digital radio control system comprising a transmitter for producing a repeating series of width modulated pulses, and a receiver responsive only to a series of predetermined pulse characters to actuate a load device such as a garage door operator. Both the transmitter and the receiver circuits comprise simple counter circuits and switches to define the pulse codes. The receiver counter is clocked by the transmitted pulse series and actuates the output circuit only if it reaches the final counter stage at least once.

Digital encoder for door operator

Control system including radio receiver circuit for a power-driven operator for garage doors and the like comprising an operator control circuit having a regulated DC voltage source operating as a power supply for an electronic flip-flop device responsive to successively applied input signals to establish circuits of opposite direction through a reversible electric motor; i.e., one actuation causes the motor to run in one direction and the next actuation causes it to run in the opposite direction. The operator is subject to actuation by both a hard-wired push-button and a radio receiver which is responsive to signals from a remote transmitter. The power supply for the flip-flop is also the power supply for the receiver; however, the receiver is packaged separately from the operator and power supply and is readily disconnected for independent maintenance and repair.

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Ann Arbor, MI, United States of America

Kenneth F Umpleby