Communications: electrical – Selective – Having indication or alarm
Patent
1978-12-29
1981-07-07
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
340612, 340620, 338 13, 338 28, 116109, 73293, 73304R, 200 612, B60Q 100, G08B 2100
Patent
active
042777739
ABSTRACT:
An apparatus for cooperation with an existing opening within a cooling radiator of a vehicle for determining the liquid level in the radiator. The radiator, which may be an automobile or truck radiator, is connected to an electrical power source of the vehicle through the vehicle chassis. An insulator is established relative to the vehicle radiator in a substantially fixed relation. A sensor is mounted to the insulator for extending into the liquid in the radiator when a sufficient quantity of liquid is contained therein. The sensor has a plurality of curved surfaces for increasing the surface area of the sensor. An indicator interconnects the sensor with the electrical power source of the vehicle for indicating the level of liquid contained in the radiator by conductivity through the liquid in contact with the sensor. The increased surface area of the sensor enables the indicator means to be a conventional incandescent lamp connected in series with the sensor and the electrical power source of the vehicle. Also included is a first and a second sensor mounted at a first and a second vertical height within the vehicle radiator. The indicator may include a first and a second indicator connected in series with the first and second sensors respectively for indicating a cool liquid level and a hot liquid level within the radiator respectively.
REFERENCES:
patent: 3179920 (1965-04-01), McGinty
patent: 3312936 (1967-04-01), Huntzinger
patent: 3461447 (1969-08-01), Marouly
patent: 3534352 (1970-10-01), Gallagher
patent: 3805230 (1974-04-01), Sakusegawa et al.
patent: 3964567 (1976-06-01), McGinty
patent: 4065760 (1977-12-01), Feldon
Caldwell Sr. John W.
Crosland Donnie L.
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