Emergency ventilation system for elevator cab

Details Emergency ventilation system for elevator cab Emergency ventilation system for elevator cab

1992-10-02

1994-10-11

Joyce, Harold

Ventilation

Elevator

187393, 187414, 454343, F24F 7007

Patent

active

053542339

ABSTRACT:
An emergency ventilation system for elevator cabs includes a low voltage power source defined by the secondary winding of a stepdown transformer having its primary winding connected across a primary power source. An emergency power circuit has a single pole, double throw relay located in a normal power position when the primary power source is "on" wherein it connects the low voltage power source to the ventilating fans. The single pole, double throw relay has an emergency position wherein it is positioned to connect the emergency battery source to the ventilating fans so as to operate them independently of the primary power source for providing uninterrupted ventilation to the elevator cab.

REFERENCES:
patent: 1767988 (1930-06-01), Knapp
patent: 4032828 (1977-06-01), Strobl et al.
patent: 4241871 (1980-12-01), Newell, III et al.
patent: 4751398 (1988-06-01), Ertz, III
patent: 4875553 (1989-10-01), Smith et al.
patent: 4905579 (1990-03-01), Dame
patent: 4977818 (1990-12-01), Taylor et al.
patent: 5123875 (1992-06-01), Eubank et al.

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