Fail-safe acknowledging circuit

Details Fail-safe acknowledging circuit Fail-safe acknowledging circuit

1977-05-24

1979-12-04

Pitts, Harold I.

Communications: electrical

Condition responsive indicating system

With particular system function

340502, G08B 2100

Patent

active

041774590

ABSTRACT:
A fail-safe solid-state acknowledging circuit for a cab signaling system requiring an acknowledgment after the reception of a more restrictive speed command signal employing a plurality of transistor latching circuits having a predetermined order of more restrictive significance. Each of the transistor latching circuits is coupled to one input of a separate two input OR gate while a separate a.c. transistor amplifier is coupled to the other input of each of the two input OR gates. The outputs of the OR gates along with an acknowledging switch controlled voltage are coupled to the inputs of a multiple input AND gate for normally holding the AND gate in a signal passing condition and for causing the AND gate to assume a signal blocking condition when a more restrictive speed command signal is received onboard a vehicle.

REFERENCES:
patent: 2462454 (1949-02-01), Allison
patent: 3550122 (1970-12-01), Siddiqi
patent: 3582925 (1971-06-01), Porter
patent: 3582949 (1971-06-01), Forst
patent: 3609709 (1971-09-01), Sanville
patent: 3623048 (1971-11-01), Haddock
patent: 3696356 (1972-10-01), Franke
patent: 3922641 (1975-11-01), Gates
patent: 3978479 (1976-08-01), Schmitz
patent: 4011542 (1977-03-01), Baichtal
patent: 4072924 (1978-02-01), Pomerantz
patent: 4072925 (1978-02-01), Yashima

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