Brake-fluid level detector

Electricity: circuit makers and breakers – Float – Float and pressure

Patent

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Details

73313, 340623, H01H 3518

Patent

active

042700337

ABSTRACT:
A fluid-level detector comprises a container, here a brake-fluid reservoir for an automotive vehicle, adapted to hold a supply of a fluid and containing a float connected via a link arm to a permanent magnet for displacement of the magnet vertically through a predetermined magnet position on vertical displacement of the float through a predetermined float position corresponding to a fluid level at which a signal is to be given. A pair of contacts outside the container can be engaged by a switch element which is displaceable toggle-fashion by the magnet between a closed position engaging and forming a closed circuit with the contacts and an open position out of engagement with at least one of the contacts. A pair of abutments on the container defines a pair of stable end positions for the switch element which respectively correspond to the open and closed positions thereof and establishes an unstable metastable position between the stable positions which corresponds generally to the predetermined magnet position. Thus as the magnet passes through the predetermined magnet position the switch element moves between the open and closed positions.

REFERENCES:
patent: 3051805 (1962-08-01), Binford
patent: 3934103 (1976-01-01), Walstra

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