Pressure differential switch with range balance adjustment

Claim 1

A PRESSURE DIFFERENTIAL CONTROL SNAP SWITCH WITH A CASING, AN ELONGATED ACTUATING ARM, HAVING UPPER END LOWER SIDES, A THRUST BUTTON PORTION ON THE ARM EXTENDING BELOW SAID ARM, AN OPERATING PIN IN SAID SWITCH ENGAGED WITH SAID ACTUATING ARM DURING DEPRESSION AND RETRACTION OF SAID PIN DURING OPERATION OF SAID SWITCH, SAID CONTROL INCLUDING A HOUSING HAVING TOP AND BOTTOM WALLS, SAID SHOUSING BEING SECURED TO SAID CASING OF SAID SWITCH, SAID SNAP SWITCH BEING CONFINED IN SAID SWITCH CASING, SAID ACTUATING ARM BEING IN CONSTANT ENGAGEMENT WITH SAID PIN, A MOUNTING PLATE FOR SAID ARM WITH A CENTRAL OPENING, SAID PLATE HAVING AN UPSTANDING LUG, SAID ARM BEING PIVOTED TO SAID LUG, A PAIR OF PRESSURE CHAMBRS IN SAID HOUSING, ONE CHAMBER BEING BELOW THE TOP WALL AND RESPONSIVE TO STATIC PRESSURE AND THE OTHER CHAMBER BEING ABOVE THE BOTTOM WALL AND BEING RESPONSIVE TO VARIABLE PRESSURE, A PLATE DIAPHRAGM IN SAID HOUSING, A FLEXIBLE MEMBRANE SEAL CONNECTED TO SAID PLATE DISPHRAGM AND SECURED BETWEEN SAID TOP AND BOTTOM WALLS OF SAID HOUSING, SAID FLEXIBLE MEMBRANE SEAL AND SAID PLATE DIAPHRAGM FORMING A DIVIDING WALL BETWEEN SAID CHAMBERS, AN OPENING IN THE TOP WALL OF SAID HOUSING NEXT TO SAID PRESSURE CHAMBER IN REGISTRY WITH THE SAID CENTRAL OPENING IN THE MOUNTING PLATE, A SECOND FLEXIBLE MEMBRANE SEAL SECURED BETWEEN SAID MOUNTING PLATE OVER THE EXTERIOR OF THE TOP WALL OF SAID HOUSING, WHEREBY SAID DIFFERENTIAL CONTROL CHAMBERS ARE ISOLATED FROM AMBIENT ATMOSPHERIC PRESSURE ARROUND THE SWICTH OPERATING PIN, SAID THRUST BUTTON PORTION EXTENDING BELOW SAID ARM BEING IN CONTACT WITH THE SAID SECOND MEMBRANE SEAL, A SECOND THRUST BUTTON CARRIED BY SAID PLATE DIAPHRAGM IN OPPOSED ALIGNMENT WITH SAID ARM THRUST BUTTON IN CONTACT WITH EACH OPPOSITE SIDE OF SAID MEMBRANE SEAL, A RANGE SPRING MEANS ENGAGED WITH SAID SWITCH ACTUATING ARM, AND AN OPPOSITELY ACTING SPRING WITH RESPECT TO SAID RANGE SPRING ENGAGED WITH SAID PLATE DIAPHRAGM IN SAID VARIABLE PRESSURE CHAMBER FOR MAINTAINING EACH OF SAID RESPECTIVELY OPPOSED THRUST BUTTONS WITH OPPOSED MOVEMENT-FORCE IN CONSTANT CONTACT WITH SAID SECOND MEMBRANE SEAL.