Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1985-01-18
1986-04-15
Rowland, James L.
Communications: electrical
Condition responsive indicating system
Specific condition
73290R, 340 59, G08B 2100
Patent
active
045830851
ABSTRACT:
An oil level sensor assembly adapted for installation in an automobile engine crankcase at the level corresponding to "low oil". The sensor assembly utilizes the principle that air is expandable whereas oil is not. Accordingly, when it is desired to sense the oil level, a predetermined amount of fluid is trapped within a chamber sealed by a diaphragm. If the oil level is adequate, then the sensor will be below the oil level and the trapped fluid will be oil. However, if the oil level is low, the trapped fluid will be air. After the fluid is trapped, a spring operating on the diaphragm attempts to expand the chamber. If the admitted fluid is air, the chamber can be expanded and a switch contact will be made, to provide an indication of low oil level. On the other hand, if the chamber is filled with oil, the chamber will not expand and the switch contact will not be made.
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Bell Edward L.
Davis David L.
Myer Daniel
Rowland James L.
Smith Robert E.
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