Measuring and testing – Liquid level or depth gauge – Float
Patent
1974-04-26
1976-02-10
Aegerter, Richard E.
Measuring and testing
Liquid level or depth gauge
Float
73316, 137558, G01F 2306
Patent
active
039370844
ABSTRACT:
A liquid level indicator for a liquid container, such as the crankcase oil reservoir of an internal combustion engine, comprises a source of fluid at a predetermined pressure and a fluid conduit system connected to the fluid source. A gage responsive to fluid pressure and a valve mechanism are coupled to the conduit system downstream of a restriction orifice in the system. The valve mechanism includes an outlet orifice for fluid in the system and a valve body that is movable axially of the orifice so as to vary its cross-sectional flow area. The valve body is coupled to a float that is mounted for limited vertical movement in the container so that when the liquid in the container is at any particular level within a predetermined range, the liquid exerts a buoyancy force on the float which is balanced by opposing forces, including the float weight and a force exerted by the pressurized fluid on the float through the valve body. The force exerted by the fluid is reflected in a corresponding fluid pressure in the conduit system between the restriction orifice and the outlet orifice. This pressure is a measure of the liquid level in the container.
REFERENCES:
patent: 1691730 (1928-11-01), Muzzy
patent: 2592569 (1952-04-01), Henderson
Aegerter Richard E.
Mack Trucks, Inc.
Schmidt Frederick R.
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