Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1979-04-27
1982-06-08
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340 58, 200 6122, 116 34R, 731462, H04Q 700, G08B 108, B60C 2300
Patent
active
043342159
ABSTRACT:
For use with trucks, aircraft and other motor vehicles, circuit apparatus signals, from within a pneumatic tire to a display near the operator, an abnormal tire pressure or temperature. A monitoring transmitter within the tire utilizes a negative coefficient thermistor maintained in thermal contact with the tire to sense an abnormal high temperature, and a bellows-type pressure sensor, internally pressurized to approximately the normal tire pressure, to sense abnormal high or low pressures. If one of these abnormal conditions is sensed, power is supplied from a long-lifetime battery to an FM transmitter modulated by a different selected frequency for each tire, selected by a potentiometer marked for each frequency. These circuit elements are on a circuit board secured to the inside of the tire by an overlaying elastic adhesive material which absorbs shock and thermally insulates the thermistor from the air within the tire. A receiver near the operator detects any transmitted signals and determines the modulating frequency by tone decoders. The abnormal indication is presented to the operator by a display marked with a plan view of the vehicle having an LED marking each tire.
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Brainerd Michael G.
Frazier John D.
Grandfield Wilmur G.
Caldwell Sr. John W.
Crosland Donnie L.
Gross Jerome A.
Tire-Tronics, Inc.
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