Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1974-12-30
1976-08-03
Queisser, Richard C.
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
73419, 116114PV, G01F 2300, G01L 716
Patent
active
039722341
ABSTRACT:
A liquid level indicator as applied to an internal combustion engine, having a crankcase forming an oil reservoir therein, has conduit means extending downwardly generally into the reservoir with a lower open end of said conduit means being positioned at an elevation corresponding to a preselected minimum level of such oil within the reservoir. A cylinder chamber, connected to the other end of the conduit means, contains a manually depressable plunger-like piston which is resiliently urged in a first direction. When the piston plunger is fully depressed in a second direction (opposite to the first direction) the air within the cylinder chamber is displaced through the conduit means. Upon subsequent release of piston plunger, an associated spring urges the piston plunger in the first direction creating a reduced atmospheric pressure within the cylinder chamber. If the level of the oil in the reservoir is above the open end of the conduit means, oil will flow upwardly into the conduit means, until an equilibrium is attained when its pressure head equals the difference between ambient atmospheric pressure and the reduced atmospheric pressure. When such equilibrium is attained, the further movement, in the first direction, of said piston plunger is stopped with the result that such stopping occurs prior to the piston plunger fully returning to its original position. If the level of the oil is below the open end of the conduit means, the piston plunger, when released, will fully return to its original position. The difference between which of such positions the piston plunger returns to, when released, is employed as an indication of whether the level of oil is sufficient.
REFERENCES:
patent: 1539407 (1925-05-01), Phelps
patent: 1711507 (1929-05-01), Titterington
patent: 1758077 (1930-05-01), Fentress
patent: 2642743 (1953-06-01), Hermanny
patent: 2840035 (1958-06-01), La Porte
patent: 3062600 (1962-11-01), Zehner
patent: 3722896 (1973-03-01), Tankus
patent: 3769880 (1973-11-01), Mirjanic
patent: 3834236 (1974-09-01), Durin
Appleman John S.
Queisser Richard C.
Romanski Lon H.
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