Pneumatically operable switch unit for monitoring tire pressure

Details Pneumatically operable switch unit for monitoring tire pressure Pneumatically operable switch unit for monitoring tire pressure

1982-03-02

1984-03-06

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Pneumatic tire inflation responsive

200 6125, H01H 3500

Patent

active

044356250

ABSTRACT:
An insulating cup-shaped body (29) that is screwed into the rim (11) of a vehicle wheel prevents conduction of heat (generated by the brakes, for example) from heating the metallic body (16) that forms a reference pressure chamber closed off by a membrane (17) from the inflated interior of a vehicle tire. The membrane (17) is set slightly within the rim of the cup for protection during tire changes. The chamber and switch housing (16) and a spool (27) for the coil of a resonant circuit form a preassembled unit that is snapped into the insulating cup and cemented into place. The relatively large coil diameter adds to the economy of the device, permitting the use of a small capacitor. The temperature of the gas sealed in the reference pressure chamber (18) by closure of the filling bore with a steel ball (25) follows the temperature of the interior of the tire and reliably opens the resonant circuit if the tire pressure falls below a prescribed limit. The condition of the resonant circuit is sensed by a fixed miniature oscillator mounted on the axle.

REFERENCES:
patent: 3602884 (1971-08-01), Brumbelow
patent: 3787806 (1974-01-01), Church
patent: 3961309 (1976-06-01), Eddy
patent: 3985984 (1976-10-01), Cappa
patent: 4148008 (1979-04-01), Lusk et al.
patent: 4180795 (1979-12-01), Matsuda et al.
patent: 4292484 (1981-09-01), Pruss
patent: 4350854 (1982-09-01), Matsuda et al.

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