Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1990-08-14
1991-10-22
Deboer, Todd E.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
187119, 318807, B66B 130
Patent
active
050587102
ABSTRACT:
A simplified elevator power system using an AC-DC converter, both to convert AC to DC during normal operation and to convert stored DC power to AC during power failures. A power source monitoring relay monitors AC power coming from a utility, and upon power failure, switches a battery from a charging mode to a power source mode wherein DC power is supplied, not only to an inverter for driving a motor, but also to a converter hooked up to run as an inverter during such power failure in order to provide stepped-up AC voltage to elevator control devices. In this way, the prior art addition of an extra inverter is avoided.
REFERENCES:
patent: 4503938 (1985-03-01), Nomura
patent: 4516665 (1985-05-01), Watanabe
patent: 4548299 (1985-10-01), Nomura
patent: 4554999 (1985-11-01), Kamaike
patent: 4666020 (1987-05-01), Watanabe
patent: 4779709 (1988-10-01), Mitsui et al.
Deboer Todd E.
Duncanson Jr. W. E.
Maguire, Jr. Francis J.
Otis Elevator Company
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