Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1977-11-21
1979-07-17
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
137 43, G01C 504, G01C 922
Patent
active
041610695
ABSTRACT:
An elongated flexible level assembly usable as a transit or the like includes a pair of float assemblies each having a flow passage thereinto adjacent the lower end, a pair of valve seats within the chamber of the housing in spaced relationship above the flow passage thereinto and valve members reciprocable in the chamber to seal the flow passage through the valve seats. Indicator means is provided on the housing intermediate the two valve seats, and the housing is transparent at least about the indicator means so as to permit viewing of the water level therein. A flexible conduit interconnects the flow passages of the two float assemblies and liquid is introduced into the assembly in a volume sufficient to fill the conduit and the two float asemblies to the level of the indicator means.
Loss of the liquid from the assembly is avoided by providing float means below the upper valve member to move this valve member into sealing engagement with its valve seat in the event that the water level rises to a point approaching the upper valve seat. In addition, valve actuating means within the housing is responsive to substantial tilting of a float assembly to move the valve members into sealing engagement with the valve seats.
REFERENCES:
patent: 397294 (1889-02-01), Karr
patent: 909529 (1909-01-01), Blair
patent: 2769452 (1956-11-01), Gill
patent: 2971264 (1961-02-01), Cowan
patent: 3842513 (1974-10-01), Clark
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