Measuring and testing – Tire – tread or roadway – Tire inflation testing installation
Patent
1994-07-11
1996-07-02
Chilcot, Richard
Measuring and testing
Tire, tread or roadway
Tire inflation testing installation
731468, 73723, 737291, 340442, 340445, B60C 2304, G01L 706
Patent
active
055311091
ABSTRACT:
A device for monitoring tire air pressure in each one of the wheels of a vehicle at any time, and providing the driver of the vehicle with a warning signal in case the pressure in any one of the vehicle's tires deviates from a normal predetermined value. The device includes a tire pressure gauge mounted onto the rotating tire, connected to a pair of air capacitors formed by four metallic annular strips, these capacitors being used as a timing capacitor in an oscillator producing two discrete frequencies depending on the ON-OFF position of the tire pressure gauge. Eventually a voltage comparator produces a square train pulse whenever its input falls below a certain level determined by a trimmer and the amplitude of the square train pulse is increased by a monostable multivibrator, the output of which drives an indicating LED to warn the vehicle's driver of the faulty air pressure in one of his tires.
REFERENCES:
patent: 3356803 (1967-12-01), Redmond, Jr.
patent: 3881170 (1975-04-01), Hosaka et al.
patent: 4072926 (1978-02-01), Shimahara et al.
patent: 4452202 (1984-06-01), Meyer
patent: 4476725 (1984-10-01), Chorel et al.
Chilcot Richard
Felber Joseph L.
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