Sphygmometer apparatus

Claim 1

A SYSTOLIC PRESSURE MEASURING SYSTEM COMPRISING IN COMBINATION A PNEUMATIC SYSTEM FOR PROVIDING AN INDICATION OF A PERSON''S SYSTOLIC PRESSURE AND A COIN OPERATED ELECTRICAL CONTROL SYSTEM FOR INITIATING OPERATION OF SAID PNEUMATIC SYSTEM AND TERMINATING A CYCLE OF OPERATION OF SAID PNEUMATIC SYSTEM WHEN SYSTOLIC PRESSURE HAS BEEN INDICATED, SAID PNEUMATIC SYSTEM COMPRISING AN INFLATABLE CUFF FOR RECEIVING A PERSON''S ARM AND APPLYING PRESSURE THERETO FOR STOPPING CIRCULATION OF BLOOD THEREIN, A TRANSDUCER ASSOCIATED WITH SAID CUFF FOR PRESSURE CONTACT WITH THE PERSON''S ARM, AN AIR COMPRESSOR, A MANOMETER, AN ELECTRICALLY OPERABLE VALVE BETWEEN SAID COMPRESSOR AND SAID MANOMETER OPERABLE TO ISOLATE SAID MANOMETER FROM SAID COMPRESSOR, AND A BLEEDER VALVE ADAPTED TO REDUCE PRESSURE IN SAID PNEUMATIC SYSTEM AT A CONTROLLED RATE, SAID COIN OPERATED CONTROL SYSTEM COMPRISING AN AMPLIFIER COUPLED TO SAID TRANSDUCER FOR PRODUCING AN ELECTRICAL WAVE AS A FUNCTION OF THE PERSON''S SYSTOLIC BLOOD PRESSURE, SWITCH MEANS COUPLED TO SAID AMPLIFIER AND SAID VALVE AND RESPONSIVE TO SAID WAVE FOR OPERATING SAID VALVE TO ISOLATE SAID MANOMETER WHEN PRESSURE EQUAL TO THE PERSON''S SYSTOLIC PRESSURE OCCURS, COIN OPERATED SWITCH MEANS IN SAID CONTROL SYSTEM FOR INITIATING OPERATION OF SAID PNEUMATIC SYSTEM AND SWITCH MEANS COUPLED TO SAID PNEUMATIC SYSTEM AND SAID AMPLIFIER AND RESPONSIVE TO A PREDETERMINED PRESSURE IN SAID PNEUMATIC SYSTEM FOR INITIATING OPERATION OF SAID AMPLIFIER.