Low tire pressure warning system with mechanical latching

Abstract From the Canadian patent

Abstract of the Disclosure, An air switch senses abnormally low pressure in a tire and provides a pneumatic signal to an actuator which moves a magnet from a normal position to a warning position. An electrical detection system senses that the magnet is in a warning position and provides a low pressure warning signal to the vehicle operator. The actuator contains a mechanical latch to assure that the magnet remains in a warning position even if the pneumatic signal should cease. A reset feature allows the latch to be disengaged to return the actuating mechanism to normal condition when proper tire inflation pressure has been restored.