Brake-fluid level detector
US4270033A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 30, 1979 |
| Grant date | May 26, 1981 |
| Priority date | — |
| Expiry date | May 30, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H36/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.