Automatic emergency power for vacuum powered braking systems

Claim 1

IN AN AUTOMOTIVE VEHICLE HAVING PNEUMATIC LOAD BEARING TIRES AND A PRESSURE FILLED SPARE TIRE, A VACUUM POWERED BRAKING SYSTEM INCLUDING AN EMERGENCY BRAKING SYSTEM OPERATIVE IN THE EVENT OF INADEQUATE VACUUM SUPPLY, WHICH VACUUM POWERED BRAKING SYSTEM COMPRISES: A SOURCE OF VACUUM; A MASTER CYLINDER; A FLUID PRESSURE MOTOR HAVING A MOVABLE WALL THEREIN WHICH IS NORMALLY ACTUATED WHEN ATMOSPHERIC PRESSURE IS COMMUNICATED TO ONE SIDE OF SAID MOVABLE WALL AND SAID VACUUM SOURCE IS COMMUNICATED TO THE OPPOSITE SIDE OF SAID MOVABLE WALL; A CONTROL VALVE OPERATIVELY CONNECTED TO SAID MASTER CYLINDER, SAID CONTROL VALVE HAVING A CONTROL PORT AND AN ATMOSPHERIC PORT; A CONDUIT CONNECTING A PRESSURE SOURCE WITHIN THE SPARE TIRE TO THE ATMOSPHERIC PORT OF SAID CONTROL VALVE; A MEANS SENSING THE AMOUNT OF VACUUM OF SAID VACUUM SOURCE; A CONTROLLABLE VALVE BLOCKING COMMUNICATION OF THE PRESSURE IN THE SPARE TIRE WITH SAID ATMOSPHERIC PORT; AND A MEANS CONTROLLED BY SAID MASTER CYLINDER AND OPERATIVELY CONNECTING SAID VACUUM SENSING MEANS TO SAID CONTROLLABLE VALVE UPON ACTUATION OF SAID MASTER CYLINDER WHEREUPON THE VACUUM SENSING MEANS CAN ACTUATE SAID CONTROLLABLE VALVE TO OPEN COMMUNICATION OF SAID SPARE TIRE PRESSURE TO THE ATMOSPHERIC PORT OF SAID CONTROL VALVE.