Broken rail/bond detectors

Details Broken rail/bond detectors Broken rail/bond detectors

1981-04-08

1983-06-21

Swann, III, Glen R.

Railway switches and signals

Block-signal systems

Automatic

246 28F, 340 47, B61L 2100, G08B 2100

Patent

active

043890334

ABSTRACT:
A track circuit receiver is driven by the signal across an impedance bond and operates a relay to disconnect the signal so causing the relay to cycle. In series with the receiver input is a signal from the center tap of the impedance bond, which is normally at earth potential and does not affect the relay cycling. In the event of a rail break a significant output is obtained from the center tap, which either cancels or replaces the original receiver input signal but on a permanent basis uncontrolled by the relay. The relay therefore ceases to cycle in either event and thus provides a break indication.

REFERENCES:
patent: 1667577 (1928-04-01), Wallace
patent: 1868490 (1932-07-01), Baughman
patent: 2098833 (1937-11-01), Peter
patent: 2357236 (1944-08-01), Thompson
patent: 2393136 (1946-01-01), Bettison
patent: 4117463 (1978-09-01), Norton

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