Air switch for low tire pressure indication

Signals and indicators – Vehicle – Tire inflation or deflation

Patent

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Details

731462, B60C 2304

Patent

active

042089824

ABSTRACT:
An air switch responsive to low tire pressure for emitting a pulse of air when a critical low tire pressure is achieved comprises a housing having a chamber ported to the internal tire pressure and a bellows within the chamber filled to a reference pressure. A passageway connecting the chamber to an outlet port is closed by a spring biased poppet valve. A pin on the moving end of the bellows is arranged to extend through the passageway to abut the poppet valve so that when low tire pressure causes bellows expansion, the pin will unseat the poppet valve to allow air pressure to escape from the tire through the outlet port. A second valve surrounding the stem on the bellows engages the chamber end of the passageway to close the same whenever the tire pressure reaches a second critical low pressure to stop the airflow through the outlet port.

REFERENCES:
patent: 1582523 (1926-04-01), Larson et al.
patent: 2438413 (1948-03-01), Renner
patent: 2510785 (1950-06-01), Potts et al.
patent: 2798449 (1957-07-01), Catlin
patent: 3230968 (1966-01-01), Struby
patent: 3537068 (1970-10-01), Amundsen, Jr.

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