Vehicle tire pressure monitor

Details Vehicle tire pressure monitor Vehicle tire pressure monitor

1978-09-11

1979-06-26

Waring, Alvin H.

Communications: electrical

Selective

Having indication or alarm

200 6125, B60C 2304

Patent

active

041594657

ABSTRACT:
A tire pressure monitor wherein a drop in the air pressure within the tire of a vehicle wheel is utilized to complete an electrical circuit including a signal lamp. The pressure in the tire fluidly communicates with a bellows mounted on the wheel and having a fixed end and a free end such that the tire pressure provides an expansive force on the free end of the bellows. A compressed helical spring bears against the free end of the bellows to provide a compressive force on the free end of the bellows so that the bellows is compressed when the tire pressure drops. The free end of the bellows is mechanically linked to a flexible strip which is supported, but not clamped, at two positions disposed about the linkage to the bellows so that the strip is flexed by a compression of the bellows. An extension of the strip is pivoted against a slip ring via the flexing to complete the electrical circuit.

REFERENCES:
patent: 3117195 (1964-01-01), Woodfill et al.
patent: 3508193 (1970-04-01), Giovannelli et al.
patent: 3760350 (1973-09-01), Johnson

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