Railway switches and signals – Cab signal or train control – Derailment
Patent
1975-04-15
1976-11-30
Blix, Trygve M.
Railway switches and signals
Cab signal or train control
Derailment
246DIG1, B61L 312
Patent
active
039944590
ABSTRACT:
In order to detect derailment of a railway vehicle each vehicle in a train is provided with an acceleration responsive device which, in response to the vehicle acceleration resulting from derailment of the vehicle transmits a short range radio signal to a receiver installed in the engine to provide a visual or audio alarm. In one practical arrangement requiring no routine maintenance each transmitter unit has a resonant circuit which is energized as a result of the stressing of a piezo-electric crystal upon vehicle derailment, avoiding the need for any separate electrical power source on the vehicle.
REFERENCES:
patent: 998513 (1911-07-01), Hill
patent: 2391228 (1945-12-01), Day
Miller Geoffrey D.
Moorey Ernest J.
Blix Trygve M.
Eisenzopf Reinhard J.
M.L. Engineering (Plymouth) Limited
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