Railway switches and signals – Cab signal or train control – Magnetic rail
Patent
1981-11-09
1985-06-25
Groody, James J.
Railway switches and signals
Cab signal or train control
Magnetic rail
246 63R, 246167R, 104299, 343458, 367128, B61L 300, B61L 108, G01S 302
Patent
active
045249318
ABSTRACT:
A device for indicating a certain proximity between movable units emitting to the units a synchronizing signal with a very high transmission speed. A transmitter device is situated at least on certain of the units. The transmitter device is activated by the synchronizing pulse to emit an information signal in the form of a wave propagation movement in the medium in which the units are located. The wave propagation movement has in comparison with the synchronizing signal a considerably lower transmission speed. In at least certain others of the units the information signal is received by and related to the difference in time between the synchronizing signal and the received information signal to a predetermined time value corresponding to a certain proximity between the units. Thereafter the difference in time is evaluated in relation to the predetermined time value.
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patent: 4313183 (1982-01-01), Saylors
Groody James J.
Ingeniorsfirma N.D.C. Netzler & Dahlgren Co Aktiebolag
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