Communications: electrical – Systems – Call station
Patent
1974-07-03
1976-08-17
Caldwell, John W.
Communications: electrical
Systems
Call station
315 83, 3171555, 335151, 335177, 335182, 335268, G08B 2100
Patent
active
039757218
ABSTRACT:
There is provided an indicator and a pair of cooperating vehicular lamps including a first lamp and a second lamp. An arrangement for activating the indicator when only one of the lamps is operating includes at least one cylindrical coil unit having a winding comprised of two wires including a first wire and a second wire. The first wire is connected to the first lamp in such a manner that when the first lamp is operating the first wire carries the first current producing a first magnetic field. The second wire is connected to the second lamp in such a manner that when the second lamp is operating the second wire carries a second current producing a second magnetic field which opposes and at least partly cancels out the first magnetic field. An encapsulated magnetic field responsive switch unit is comprised of a magnetic field responsive switch encapsulated in a gas-tightly sealed capsule filled with a protective gas, and is positioned in the center of the coil unit and oriented to become activated when only a single one of said fields is produced and to remain unactivated when both said fields are produced. The encapsulated switch unit is connected to the indicator. When the encapsulated switch unit becomes activated, the indicator becomes activated.
REFERENCES:
patent: 1721177 (1929-07-01), Churcher
patent: 2048623 (1936-07-01), Redinger
patent: 2882367 (1959-04-01), Baker et al.
patent: 2916584 (1959-12-01), Molyneux
patent: 3134867 (1964-05-01), Winship
patent: 3629799 (1971-12-01), Birtwistle
patent: 3643248 (1972-02-01), Schott
patent: 3753224 (1973-08-01), Martin
Caldwell John W.
Hermann Stribel KG
Myer Daniel
Striker Michael J.
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