System for monitoring air pressure in a spare tire

Details System for monitoring air pressure in a spare tire System for monitoring air pressure in a spare tire

1994-08-08

1996-05-07

Chilcot, Richard

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

731465, 731468, 200 6122, 200 6125, 340442, B60C 2302

Patent

active

055135242

ABSTRACT:
Air pressure in a spare tire of a land vehicle is monitored and a driver is signalled if that air pressure drops below a pre-set level. However, the signal only occurs when the driver applies the brakes of the vehicle. A first switch electrically connects an alarm to power and closes when air pressure in the spare tire drops below the preset level. A second switch connects the first switch to power when the vehicle brakes are applied so that both the air pressure controlled switch and the brake lights must be operated in order for power to be applied to the alarm.

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patent: 4814745 (1989-03-01), Wang
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patent: 5025244 (1991-06-01), Huang

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