Multi-column lifting apparatus and synchronization control devic

Details Multi-column lifting apparatus and synchronization control devic Multi-column lifting apparatus and synchronization control devic

1974-10-09

1976-07-06

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

318 73, B66B 130

Patent

active

039677010

ABSTRACT:
A lifting apparatus of the type having a number of columns supporting a load platform each column driven by an electrical, polyphase current motor whereby sensors on each column, for example potentiometers, produce a signal indicating the height of that column. The signals are applied to a comparator which in turn provides an output to one or more electronic switches, such as a triac or thyristor having a diode connected in parallel with it for conducting current in an opposite direction, each such switch connected to a winding of a motor to control the current applied so as to reduce any difference in height among the columns.

REFERENCES:
patent: 2443657 (1948-06-01), King
patent: 2534917 (1950-12-01), King
patent: 2737619 (1956-03-01), Shank et al.
patent: 3789280 (1974-01-01), Oldfield

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