Pressure monitoring apparatus

Claim 1

IN A VEHICLE INCLUDING A WHEEL ROTATABLY MOUNTED THEREON IN SUPPORTING RELATIONSHIP THERETO, A PNEUMATIC TIRE MOUNED ON THE WHEEL AND AFFORDING A PRESSURE CONFINING CHAMBER THEREIN, AND A VALVE STEM EXTENDED FROM THE TIRE AND PROVIDING A PNEUMATIC PASSAGEWAY THERETHROUGH, THE APPARATUS COMPRISING PRESSURE DETECTING MEANS INCLUDING A TUBULAR WALL MEM BER OF ELECTRICAL CONDUCTING MATERIAL AND AFFORDING AN AXIAL PASSAGEWAY THERETHROUGH; MEANS MOUNTING THE DETECTOR AT ONE END ON THE VALVE STEM IN PNEUMATIC COMMUNICATION THEREWITH; VALVE MEANS MOUNTED AT THE OPPOSITE END OF SAID DETECTOR IN FLOW-CONTACT RELATIONSHIP TO SAID PASSAGEWAY; A FIRST ELECTRICAL CONTACT; A PRESSURE RESPONSIVE BELLOWS MOUNTED IN THE TUBULAR WALL MEMBER IN PNEUMATIC COMMUNICATION WITH SAID PASSAGEWAY AND SUPPORTING SAID FIRST CONTACT, SAID BELLOWS BEING ELECTRICALLY CONDUCTIVE AND SECURED TO SAID WALL MEMBER IN CONDUCTING RELATION; A SECOND ELECTRICAL CONTACT; DIELECTRIC MEANS MOUNTING SAID SECOND CONTACT ADJACENT TO SAID FIRST CONTACT; THE SECOND CONTACT BEING ADJUSTABLY MOUNTED WITHIN SAID DIELECTRIC FOR ADJUSTABLE POSITIONING IN RELATION TO THE BELLOWS, THE BELLOWS BEING ADAPTED TO MOVE THE FIRST CONTACT TO AND FROM ENGAGEMENT WITH THE SECOND CONTACT INCIDENT TO PRESSURE CHANGES WITHIN SAID TIRE; A SOURCE OF ELECTRICAL ENERGY; REGISTERING MEANS ENERGIZABLE BY SAID ELECTRICAL SOURCE; AND CIRCUIT MEANS CONNECTING SAID ELECTRICAL SOURCE AND SAID REGISTERING MEANS IN CONTROLLED RELATIONSHIP WITH SAID CONTACTS.