Elevator system

Details Elevator system Elevator system

1975-12-10

1977-06-21

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 128

Patent

active

040305708

ABSTRACT:
An elevator system of the traction type having a direct current drive motor for moving the elevator car in a guided vertical path. An adjustable voltage source for the direct current motor is controlled by a control signal modified by a jitter suppression signal. The jitter suppression signal is proportional to vertical oscillation of the elevator car.

REFERENCES:
patent: 3523232 (1970-08-01), Hall et al.
patent: 3749204 (1973-07-01), Caputo
patent: 3921046 (1975-11-01), Anzai et al.

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