Tire inflation indicator

Claim 1

AN INFLATION INDICATOR FOR TUBELESS PNEUMATIC TIRES COMPRISING, IN COMBINATION, A SUBSTANTIALLY CONSTANT VOLUME HERMETICALLY SEALED PRESSURE CHAMBER HAVING AN ELECTRICALLY CONDUCTIVE DIAPHRAGM MOVABLE BETWEEN INNER AND OUTER POSITIONS, AN ELECTRICALLY CONDUCTIVE ELONGATED BODY MEMBER, SAID PRESSURE CHAMBER BEING FIXED AT ONE END OF SAID BODY MEMBER WITH SAID DIAPHRAGM IN ELECTRICAL CONTACT WITH A PORTION OF SAID BODY MEMBER WHEN SAID DIAPHRAGM IS IN ITS OUTER POSITION, MEANS ELECTRICALLY INSULATING SAID PRESSURE CHAMBER FROM SAID BODY MEMBER WHEN SAID DIAPHRAGM IS IN ITS INNER POSITION, MEANS FOR ELECTRICALLY AND MECHANICALLY CONNECTING THE OTHER END OF SAID BODY MEMBER TO THE INTERIOR METAL SLEEVE PORTION OF A TIRE VALVE SO THAT SAID ONE END OF SAID BODY MEMBER PROJECTS OUTWARDLY OF THE INNER END OF THE TIRE VALVE, AND MEANS FOR ELECTRICALLY CONNECTING SAID DIAPHRAGM TO THE METAL RIM OF THE TIRE WHEEL, SAID PRESSURE CHAMBER BEING INTERNALLY PRESSURIZED WITH GAS TO A DEGREE CORRESPONDING TO NORMAL INFLATION FOR A GIVEN TIRE, WHEREBY SAID DIAPHRAGM WILL MOVE FROM ITS OUTER TO ITS INNER POSITION WHEN SURROUNDING AIR PRESSURE IS BROUGHT UP TO THE SAME VALUE AS THAT WITHIN SAID CHAMBER, REGARDLESS OF THE SURROUNDING AIR TEMPERATURE.