Communications: electrical – Selective – Having indication or alarm
Patent
1979-12-04
1982-01-19
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
200 6125, 335206, B60C 2302
Patent
active
043119840
ABSTRACT:
A device for signalling the pressure in a tire fitted to a wheel of a vehicle, which device comprises a surveying member constituted by a cylinder in which there slides in sealing relationship a piston with a magnetic core in antagonism to a spring, to form a chamber in communication with the tire, the said surveying member being mounted axially on the rotating bearing of the wheel to find itself axially aligned with a sensor member fixed to a fixed part of the vehicle, the said sensor member comprising a couple of magnetic switches normally open and supported in mutual angular position and between which there is arranged a secondary magnet keeping the said switches closed, the magnetic core having a direction of magnetization opposed to the direction of magnetization of the secondary magnet, the proximity of these magnets causing the opening of the magnetic switches, an electric circuit being piloted by the opening of the switches to emit a signal.
REFERENCES:
patent: 3521230 (1970-07-01), Poole
patent: 3873787 (1975-03-01), Nozi
patent: 3978448 (1976-08-01), Vago
patent: 4209765 (1980-06-01), Mitchell
Rigazio Elio
Rossi Galileo
Salussolia Piero
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