Derail signal switch

Details Derail signal switch Derail signal switch

1977-11-01

1979-01-09

Kunin, Stephen G.

Railway switches and signals

Cab signal or train control

Derailment

200 6108, 246246, B61L 304

Patent

active

041335066

ABSTRACT:
A system for sensing derailment of a remotely controlled engine including a switch integrated with a dead man control circuit for the engine to automatically stop the engine upon activation of the switch. The switch further includes a deformable copper pipe having a brass rod within the pipe but electrically insulated therefrom. The copper pipe with the brass rod, each having a terminal electrically connected to the circuit, is placed between rails in a rail yard. When the engine derails the wheels of the engine or some other part of the train press the copper pipe in communication with the brass rod thereby activating the switch and shutting down the engine.

REFERENCES:
patent: 2007800 (1935-07-01), Graf
patent: 2391228 (1945-12-01), Day
patent: 2831965 (1958-04-01), Walker, Sr.
patent: 3021423 (1962-02-01), Gilbert
patent: 3822369 (1974-07-01), Kunczynski
patent: 3936621 (1976-02-01), Palin et al.

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