Static Leonard system

Details Static Leonard system Static Leonard system

1977-09-08

1979-08-28

Smith, Jr., David

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

318331, 318459, 361 33, B66B 502

Patent

active

041658019

ABSTRACT:
The disclosed Leonard type elevator system comprises a reversible converter for controllably driving a DC motor, and an AC voltage detector and a DC voltage detector connected to the AC and DC sides of the converter respectively for detecting the voltages developed on the respective sides of the converter. When a difference in detected voltage between the two detectors exceeds a predetermined magnitude due to a decrease in the AC source voltage, a comparator produces an output serving to disconnect the DC motor from the converter. Also the comparator may produce such an output when the converter receives regenerative power from the DC motor.

REFERENCES:
patent: 2709772 (1955-05-01), Fisher et al.
patent: 3727103 (1973-04-01), Finch et al.
patent: 3778694 (1973-12-01), Hubby et al.
patent: 3800202 (1974-03-01), Oswald
patent: 3961688 (1976-06-01), Maynard
patent: 4027202 (1977-05-01), Tyler et al.
patent: 4047234 (1977-09-01), Oyler

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