Elevator control system

Details Elevator control system Elevator control system

1975-02-07

1977-03-01

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 302

Patent

active

040097668

ABSTRACT:
A pulse generator supplies to a logic unit, pulses the number of which is determined by the amount of movement of an elevator car. The logic unit effects the algorithm and comparison of the amount of movement of the car and a command amount of movement of the car to produce a speed signal which, in turn, controls the car. The pulses are also stored in a memory and an electric source energizes the memory and the pulse generator for a predetermined time after the occurrence of an emergency.

REFERENCES:
patent: 3370676 (1968-02-01), McDonald et al.
patent: 3590355 (1971-06-01), Davis et al.
patent: 3779346 (1973-12-01), Winkler
patent: 3783974 (1974-01-01), Gilbert et al.

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