Electronic garage door opener safety device

Details Electronic garage door opener safety device Electronic garage door opener safety device

1975-08-27

1977-07-12

Schaefer, Robert K.

Electricity: motive power systems

Motor-reversing

Automatic and/or with time-delay means

318286, 318256, 318467, 318283, H02P 122

Patent

active

040357023

ABSTRACT:
The disclosure relates to a safety device for use in a garage door opening and closing system of the type which includes an impulse actuated reversible motor which opens and closes the garage door and wherein the safety device automatically actuates the motor for closing the door should the door be inadvertantly opened or accidentally remained open. The safety device includes a detector for detecting the open or closed condition of the door, a counter for keeping time responsive to the detector detecting that the door is open, and a logic circuit for providing repetitive impulses to the motor to actuate the motor for closing the door. The counter terminates keeping time and is reset by the detector when the detector detects that the door is closed. The safety device additionally includes an indicator responsive to the repetitive impulses for indicating that the logic circuits have actuated the motor for closing the door.

REFERENCES:
patent: 2756990 (1956-07-01), Reamey
patent: 3189812 (1965-06-01), Davis
patent: 3283236 (1966-11-01), Legg
patent: 3617835 (1971-11-01), Dreher et al.
patent: 3846687 (1974-11-01), Daniels et al.
Markus, Source Book of Electronic Circuits, 1968, pp. 4, 328 and 329.

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