Pressure responsive indicator device

Claim 1

AN INDICATOR DEVICE HAVING A GRADUATED FACE DIAL COMPRISING A PRESSURE CHAMBER, A FLEXIBLE DIAPHRAGM IN SAID CHAMBER, PASSAGE MEANS FOR TRANSMITTING FLUID PRESSURE AGAINST ONE SIDE OF SAID DIAPHRAGM FOR MOVEMENT THEREOF, BELL CRANK MEANS OPERATIVELY CONNECTED TO SAID DIAPHRAGM FOR MOVEMENT THEREBY, AND A ROTATABLE POINTER OPERATIVELY CONNECTED TO SAID BELL CRANK MEANS FOR INDICATING A PREDETERMINED VALUE ON SAID DIAL FACE CORRESPONDING TO THE AMOUNT OF ROTATIONAL MOVEMENT OF SAID POINTER, WHEREIN SAID PRESSURE CHAMBER IS FORMED OF TWO CIRCULAR MEMBERS OF DIFFERENT DIAMETER, AND SAID DIAPHRAGM IS CIRCULAR AND HAS ITS PERIPHERAL EDGE DISPOSED BETWEEN SAID TWO MEMBERS, AND EACH OF SAID MEMBERS HAS A RECESS FORMED ON OPPOSITE SIDES OF SAID DIAPHRAGM, AND SAID DIAPHRAGM HAS A PLURALITY OF ANNULAR COPLANAR CONVOLUTIONS THEREIN, AND PROJECTION MEANS ON SAID DIAPHRAGM EXTEND THROUGH AN OPENING IN ONE OF SAID CHAMBER MEMBERS FOR ACTUATION OF SAID BELL CRANK MEANS, WHEREIN SAID PROJECTION MEANS HAS A BAR EXTENDING INTO SAID PASSAGE MEANS, SAID PASSAGE MEANS HAS A VALVE OPENING THROUGH WHICH SAID BAR EXTENDS, A VALVE ABUTS AGAINST SAID BAR, AND BIASING MEANS ARE DISPOSED TO URGE SAID VALVE TOWARD A SEATED POSITION OVER SAID VALVE OPENING.