Blood pressure cuff inflator

Claim 1

IN BLOOD PRESSURE TAKING APPARATUS INCLUDING AN ARMLET, A PASSAGE CONNECTED TO THE ARMLET TO WHICH A PRESSURIZED SOURCE OF GAS MAY BE CONNECTED, AND MEANS FOR CONTROLLABLY SUPPLYING GAS FROM SAID SOURCE THROUGH SAID PASSAGE TO THE ARMLET AND DRAINING THE SAME FROM THE ARMLET THE IMPROVEMENT COMPRISING, IN COMBINATION, VALVE MEANS, CONTROLLED BY A PILOT PRESSURE APPLIED THERETO AND INCLUDING A REGULATING-VALVE PORTION INTERPOSED IN SAID PASSAGE, FOR RENDERING THE PRESSURE WITHIN THE ARMLET A BIDIRECTIONALLY VARIABLE FUNCTION OF SUCH PILOT PRESSURE; A PILOT PRESSURE CHAMBER, OF CAPACITY SMALL RELATIVE TO THE OPERATIVE CAPACITY OF THE ARMLET, MEANS APPLYING THE PILOT PRESSURE WITHIN SAID PILOT CHAMBER TO SAID VALVE MEANS; MANUAL CONTROL APPARATUS CONNECTED WITH THE PILOT CHAMBER, INCLUDING A COMPRESSIBLE DEVICE FOR DEVELOPING PILOT PRESSURE WITHIN THE PILOT CHAMBER, A BLEED VALVE CLOSEABLE AND OPENABLE AT WILL TO CONSERVE OR TO DISCHARGE THE PILOT CHAMBER PRESSURE AND A CHECK VALVE RESPONSIVE TO THE DIFFERENTIAL GAS PRESSURE BETWEEN SAID PASSAGE AND SAID PILOT CHAMBER FOR VENTING GAS FROM SAID PASSAGE AT A PREDETERMINED DIFFERENTIAL GAS PRESSURE.