Vital lowest speed command selector

Details Vital lowest speed command selector Vital lowest speed command selector

1981-06-12

1983-08-30

Swann, III, Glen R.

Communications: electrical

Selective

Having indication or alarm

246182C, 340 62, B61L 300

Patent

active

044019700

ABSTRACT:
A separate relay is connected across the output of each speed command filter decoder in the train carried apparatus, except that decoder associated with the highest authorized speed. Each relay has special make-and-break contacts which cannot be simultaneously closed in normal operation. When the relay is energized by an output from the associated decoder, the normally open contacts close to apply that speed command to the corresponding input of the speed governor. The associated normally closed contacts open at the same time to remove operating energy from all higher speed decoders to inhibit simultaneous response from any cause. This action assures that the train is controlled by the lowest active speed command if more than one filter decoder inadvertently responds to produce simultaneous speed command outputs.

REFERENCES:
patent: 1678683 (1928-07-01), Snavely
patent: 1690234 (1928-11-01), Lucas
patent: 1852409 (1932-04-01), Hailes
patent: 2811634 (1957-10-01), Hufnagel
patent: 3500388 (1970-03-01), Marsh et al.

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