Communications: electrical – Selective – Having indication or alarm
Patent
1977-04-21
1978-06-20
Yusko, Donald J.
Communications: electrical
Selective
Having indication or alarm
340251, 315217, B60Q 138, B60Q 146
Patent
active
040964701
ABSTRACT:
A system for alternately flashing two groups of signal lamps, as commonly employed for emergency and police vehicles, school buses, or the like, is provided with a lamp failure indicating circuit comprising two separate relay coils connected, respectively, as parts of current load lines to the lamp groups so that each coil normally will act through a contactor to energize a pilot circuit, thus causing a pilot lamp to be lighted so frequently when all the signal lamps are functional that the pilot lamp appears to be steadily illuminated; yet a relay coil will not so act, and the pilot lamp then will flash intermittantly to indicate a lamp outage, when a signal lamp on the load line of either coil does not function. In one embodiment, each relay coil has a contactor of its own in a separate branch of the pilot lamp circuit; in another, the two relay coils act alternately to displace a common contactor in the pilot lamp circuit.
REFERENCES:
patent: 3469232 (1969-09-01), Prickett
patent: 3493927 (1970-02-01), Effenberger
patent: 3508237 (1970-04-01), Kimmelman
patent: 3576444 (1971-04-01), Roberts
patent: 3668678 (1972-06-01), Porter
patent: 3925757 (1975-12-01), Kimmelman
patent: 3956733 (1976-05-01), Sakurai
patent: 3965456 (1976-06-01), Schwellenbach
Dunne Gerard F.
Ideal Corporation
Johnston Albert C.
Yusko Donald J.
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