Movable or removable closures – Condition responsive control
Patent
1978-03-27
1980-04-15
Downey, Kenneth
Movable or removable closures
Condition responsive control
340634, 49199, E05F 1520
Patent
active
041976754
ABSTRACT:
A sensing system for use in a garage or other similar enclosure having an automatic door operator for automatically opening a garage door responsive to a lack of sufficient oxygen therein including a gas detector located within the enclosure responsive to actuate a detection relay which in turn will close a normally open detection switch, the closing of the detection switch will normally cause operation of the door operator to allow oxygen to enter into the enclosure through the door opening, the detection switch being located in a door opening control circuit which includes therein a first limit switch which is open whenever the door is open in order to prevent actuation of the door operator when the door is already open, the door opening control circuit also including a delay clock and delay switch which will be normally closed to allow operation of the door operator, this system also including a time delay circuit with a second limit switch therein which is adapted to be normally open and to close only when the door is open, in this manner the second limit switch which will close when the door opens will cause actuation of the delay clock which will open the delay switch to prevent operation of the door opener for 5 minutes after the door has been opened and then closed, this system may also include a sensing lamp to be lighted whenever the gas detector is actively monitoring and also to alternatively include a detection indicator lamp which is adapted to be lighted responsive to the emitting of an electrical signal by the gas detector, the door opening control circuit in this configuration will cause opening of the door by actuation of the door operator whenever the gas detection means senses a low level of oxygen in the environment of the enclosure assuming that the door is not already in the open position.
REFERENCES:
patent: 2902276 (1959-09-01), Purdy
patent: 3631436 (1971-12-01), Taguchi
patent: 3786462 (1974-01-01), Hayden
patent: 3886535 (1975-05-01), Cirincione
Downey Kenneth
Kane John J.
Sperry Albert
Zoda Frederick A.
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