Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
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.
Duncanson Jr. W. E.
Lackey D. R.
Schaefer Robert K.
Westinghouse Electric Corporation
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