Door operator pre-warning system

Details Door operator pre-warning system Door operator pre-warning system

1987-08-03

1989-04-11

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

49 30, 49507, 34030915, 340527, 340540, G08B 2100

Patent

active

048210242

ABSTRACT:
An advance warning system for an automatic electric door operator in which a command signal originating from a remotely located hand held radio transmitter or a wall switch located within the garage is received and processed by a signal receiver and transmitted to a signal delay unit. Upon receipt of the command signal, the delay unit activates a warning light and warning horn to alert persons in the vicinity of the door or operator mechanism that the operator is about to be activated. After a predetermined delay period, the delay unit also generates an operating signal which activates the operator.

REFERENCES:
patent: 3247615 (1966-04-01), Kalog
patent: 3783556 (1974-01-01), Cook
patent: 3874117 (1975-04-01), Boehm
patent: 4167833 (1979-09-01), Farina et al.
patent: 4186521 (1980-02-01), Hunter
patent: 4197675 (1980-04-01), Kelly
patent: 4266221 (1981-05-01), Hawkins
patent: 4426639 (1984-01-01), Jessup

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