System and method for maintaining plural driven components at re

Details System and method for maintaining plural driven components at re System and method for maintaining plural driven components at re

1994-08-08

1996-02-20

Oberleitner, Robert J.

Railway rolling stock

Trucks

Overhead crane

B61D 100

Patent

active

054920671

ABSTRACT:
The disclosure involves a machine, e.g., a portal crane, having two components such as bridge support legs or rail-riding trucks. Each component is driven by a separate motor and each is moving at a speed, perhaps a different speed. A method for maintaining the speeds of the two components substantially equal to one another includes the steps of providing a differential signal representing a difference between the speeds of the two components and generating an equalizing signal reducing the speed of the higher-speed component. Preferably, a second equalizing signal is also generated to increase the speed of the lower-speed component. A new drive system is also disclosed. The method and system are particularly useful for maintaining the "squareness" of a double-leg portal crane.

REFERENCES:
patent: 3703016 (1972-11-01), Schramm

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