Emergency door opening device

Details Emergency door opening device Emergency door opening device

1977-10-25

1978-12-12

Schaefer, Robert K.

Electricity: motive power systems

Automatic and/or with time-delay means

Electrical conditions in circuit other than controlled motor...

49 31, 119 21, 307 66, H02P 104

Patent

active

041298110

ABSTRACT:
A relay system maintains an emergency door opening device circuit open so that a door of a structure remains closed as long as an electrically energized ventilation system of the structure is supplied with electrical energy from a commercial power source. When the power fails, the relay system closes the emergency door opening device circuit, which includes its own power source, to operate a door opening device which opens a door to the structure to provide emergency ventilation for the structure.

REFERENCES:
patent: 3429298 (1969-02-01), Thomason
patent: 3915377 (1975-10-01), Sutton, Jr.
patent: 3973173 (1976-08-01), Smith

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