Tire pressure alarm

Details Tire pressure alarm Tire pressure alarm

1979-11-15

1981-04-21

Caldwell, Sr., John W.

Communications: electrical

Selective

Having indication or alarm

200 6125, 731465, B60C 2304

Patent

active

042635799

ABSTRACT:
An electrical tire pressure alarm circuit includes an actuating connection to the vehicle storage battery which is keyed through a normally open disabling switch. The switch may be controlled by the vehicle ignition, by a trailer coupling, or it may be manually actuated. The transmitter is located on the vehicle wheel and responds to low tire pressure with a fixed frequency radio signal from a nominal input power less than 20 milliwatts. The transmitter oscillator is a tuned inductance/capacitance transistor oscillator circuit. An electromagnetic relay coil positioned on the vehicle frame closes an enabling switch to the transmitter only when the transmitter has been rotated by the wheel to a position proximate thereto, and only when the disabling switch has been closed. An alarm indicating system is located in the vehicle cab and is wired to the receiver and powered by the vehicle storage battery.

REFERENCES:
patent: 3178686 (1965-04-01), Mills
patent: 3215978 (1965-11-01), Brown et al.
patent: 3296590 (1967-01-01), Dalton
patent: 3588815 (1971-06-01), Koonce
patent: 4075603 (1978-02-01), Snyder et al.
patent: 4160234 (1979-07-01), Karbo et al.

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