Method and device for switching-off a supervision system

Details Method and device for switching-off a supervision system Method and device for switching-off a supervision system

1976-12-27

1980-12-16

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

340 53, 340506, 318565, 307112, G08B 2900

Patent

active

042400600

ABSTRACT:
A method of and a device for switching-off a supervision system, e.g. a system for supervising the speed of a train. It must be possible to switch off the supervision system, but only when a predetermined pattern of operations are followed. This is achieved by using a time control activation current loop to briefly operate a contact device by means of first and second operating members in combination with a time independent activation current loop that holds the contact device closed provided the predetermined pattern of operations is followed.

REFERENCES:
patent: 2662207 (1953-12-01), Hollister
patent: 2673974 (1954-03-01), Beauchemin
patent: 3953831 (1976-04-01), Estrada

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