Signals and indicators – Vehicle – Tire inflation or deflation
Patent
1978-01-13
1979-05-22
Swisher, S. Clement
Signals and indicators
Vehicle
Tire inflation or deflation
116DIG8, B60C 2304
Patent
active
041553250
ABSTRACT:
A warning indicator disclosed is secured to a pneumatic tire valve to sense tire pressure and emit an audible signal when the tire pressure goes below a predetermined value. A connector of the indicator is initially threaded onto the tire valve and a cap thereof is subsequently threaded onto the connector. The connector includes a valve opener that opens the tire valve so that pressurized tire air flows to a pressure sensing valve which prevents air flow to the cap when normal tire pressures are sensed. A valve element of the pressure sensing valve moves into and out of engagement with a valve seat and is engaged by the first end of a valve actuator that also has a second end projecting toward the cap. The cap includes a housing with a spring that biases an actuating member into engagement with the second end of the actuator so as to move the valve element out of engagement with the valve seat when low tire air pressure is present. The second end of the actuator has a rounded shape engaged by the actuating member with substantially point contact so as to generate a minimum of frictional force tending to rotate the actuator and move the valve element as the cap is screwed onto the connector. Air flow to the cap blows up an elastomeric cover thereof which ultimately ruptures to provide an audible bang indicating low tire pressure. Subsequently, a ball of a closure valve in the cap seats against a round valve seat to prevent continued air flow from the tire to the atmosphere through the indicator.
REFERENCES:
patent: 1236411 (1917-08-01), Downs
patent: 1671852 (1928-05-01), Caldwell
patent: 4024829 (1977-05-01), Su
Corr Denis E.
Swisher S. Clement
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