Tire pressure warning device
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United States of America Patent
Stats
-
Apr 12, 1988
Grant Date -
N/A
app pub date -
Dec 6, 1984
filing date -
Dec 6, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tire pressure warning device is disclosed which comprises a body adapted to be threaded into the valve stem of the tire, a pressure sensing valve in the body and an elastomeric compression spring acting on the sensing valve to open it when the pressure in the tire is below a predetermined value. In one embodiment an alarm in the body is adapted to produce an audible signal in response to air flow through the sensing valve. In another embodiment the body includes a distendable diaphragm as a pressure sensor and an elastomeric compression spring for closing a switch when the air pressure is below a predetermined value. A radio transmitter in the body transmits a warning signal when the switch is closed. A monitor detects a transmitted audio or radio signal and compares it with a stored reference signal and produces an output signal only when the transmitted signal corresponds to the stored signal.
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