Level sensing unit and a level indicating device based thereon

Claim 1

A level sensing unit comprising a sealed housing with a front and back wall, a top and bottom, and two side walls containing two communicably interconnected channels oriented from bottom to top as fluid reservoirs, each of said channels opening into a compartment containing an axle mounted between the front and back walls, said axle located between the two channels at a point above the opening of said channels, a float for each channel in electrical contact with and connected by pivotal means to the axle with the center of gravity of the float below the axle, each float having an electrically conductive extension in electrical contact with the axle and directed toward a strip of electrically conductive material mounted within the housing, said channels filled with a nonconducting unreactive fluid to a height such that when the housing is rotated around an axis passing from the front to the back wall there is some degree of rotation where the extension of each of the floats is engaged in electrical contact with the electrically conductive strip and where deviations on either side of said angle results in one float being buoyantly disengaged.