Vehicle tire pressure indicating and signalling device

Claim 1

In a device for indicating the air pressure in a tire on a movable vehicle, of the type including a pressure-responsive transducer rotatable with the tire and subjected to the tire internal pressure, operable to convert pressure variations into electrical value variations, a pressure indicating means on the vehicle body, and transmission means operable to transmit the electrical value variations to the indicating means, the improvement comprising, in combination, a first cylindrical body defining an air chamber having an open end, arranged to be threaded coaxially on the tire valve stem, and having a port therein communicating with said air chamber and the valve stem interior; a tire inflating valve extending through a wall of said first body and communicating with said first air chamber and the valve stem interior; a second cylindrical body secured in coaxial sealing relation to said first body and having wall means closing said air chamber; a transducer, operable to convert pressure variations into electrical value variations, mounted within said second body and having a pressure-responsive portion included in said wall means and subjected to the pressure in said air chamber; a signal transmitting unit; means electrically connecting said unit to said transducer; said transmitting means transmitting signals from said signal transmitting unit to said indicating means; and a sealing enclosure completely covering the exposed surfaces of said second cylindrical body and its juncture with said first cylindrical body, and sealingly engaged with said first cylindrical body.