Pneumatic switch for low tire pressure warning system

Details Pneumatic switch for low tire pressure warning system Pneumatic switch for low tire pressure warning system

1975-12-08

1976-09-21

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

200 6125, 200 83C, B60C 2302

Patent

active

039822257

ABSTRACT:
A pneumatic switch located within a tire emits a pulse of air from the tire when the tire pressure drops a preset amount below the normal operating pressure. A bellows in the switch is charged to normal operating pressure and when tire pressure drops, the bellows extends to open a valve to emit the air pulse to actuate a warning system. A valve in the bellows is opened manually to establish the pressure charge within the bellows at the level of the tire pressure when the tire is inflated. The same valve in the bellows is automatically opened during tire deflation after the air pulse is emitted to equalize the bellows charge with the lower tire pressure in order to avoid a pressure differential across the bellows sufficient to damage the bellows.

REFERENCES:
patent: 3537068 (1970-10-01), Amundsen, Jr.
patent: 3593268 (1971-07-01), Arvan

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