Elevator system

Details Elevator system Elevator system

1976-12-06

1979-05-22

Schaefer, Robert K.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

B66B 502

Patent

active

041554272

ABSTRACT:
An elevator system including an elevator car, a drive motor for the elevator car, a power supply for the drive motor which includes a three-phase source of alternating potential, and a monitor for the three-phase source. The monitor discriminates between a malfunction of the three-phase source which should initiate shutdown of the elevator system, and a momentary disturbance which should be ignored.

REFERENCES:
patent: 3410368 (1968-11-01), Inuzuka
patent: 3961688 (1976-06-01), Maynard

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