Pressure switch with high and low limits

Claim 1

A PRESSURE SWITCH FOR OPERATING A CIRCUIT RESPONSIVE TO BOTH A PREDETERMINED LOW PRESSURE LIMIT AND A PREDETERMINED HIGH PRESSURE LIMIT, WHICH COMPRISES IN COMBINATION, A SWITCH HOUSING, AN EXPANSIBLE AND CONTRACTABLE BELLOWS MEMBER WITH A FLUID PRESSURE INLET MEANS THERETO AND A MOVABLE EXTERIOR PORTION, A PIVOTED SWITCH ARM MOUNTED IN SAID HOUSING, SAID SWITCH ARM HAVING A FIRST EXTENDED ARM PORTION SHAPED AND POSITIONED TO CONTACT WITH THE MOVABLE EXTERIOR PORTION OF SAID BELLOWS MEMBER AND A SECOND EXTENDED ARM PORTION WITH A BIFURCATED ELECTRICAL CONDUCTOR MEMBER, THE LATTER HAVING FLEXIBLE SPRING-LIKE SPACED APART END CONTACT ELEMENT THAT ARE POSITIONED TO SPRING AGAINST ELECTRICAL CONTACT MEANS IN TRUN FIXEDLY POSITIONED IN SAID HOUSING, A PAIR OF PRONGLIKE CIRCUIT BREAKING MEMBERS ATTACHED TO SAID SECOND EXTENDED ARM PORTION OF SAID SWITCH ARM AND POSITIONED TO BE ADJACENT SAID FLEXIBLE CONTACT ELEMENTS OF SAID ELECTRICAL CONDUCTOR MEMBER, SAID CIRCUIT BREAKING MEMBERS HAVING THEIR FREE END PORTIONS A SHORT SPACED DISTANCE FROM THE RESPECTIVE FLEXIBLE CONTACT ELEMENTS WHEN THE LATTER ARE IN A CENTRAL POSITION WITH RESPECT TO SAID ELECTRICAL CONTACT MEANS WHEREBY ONE PRONG-LIKE MEMBER IS EFFECTIVE TO ENGAGE AND MOVE ITS CLOSELY ADJACENT FLEXIBLE CONTACT ELEMENT WITH RESPECT TO SAID ELECTRICAL CONTACT MEAN RESPONSIVE TO A GIVEN PESSURE INCREASE WITH AN INCREMENT OF EXPANSION OF SAID BELLOWS MEMBER AND AN ACCOMPANYING MOVEMENT OF THE SWITCH ARM, AND THE OTHER PRONG-LIKE CIRCUIT BREAKING MEMBER IS EFFECTIVE TO ENGAGE AND MOVE ITS CLOSELY ADJACENT FLEXIBLE CONTACT ELEMENT WITH RESPECT TO SAID ELECTRICAL CONTACT MEANS RESPONSIVE TO A GIVEN INCREMENT OF CONTRACTION OF SAID BELLOWS MEMBER AND THE RESULTING OPPOSITE MOVEMENT OF SAID SWITCH ARM.