Governor

Claim 1

AN ENGINE SPEED CONTROL MECHANISM FOR AN INTERNAL COMBUSTION ENGINE COMPRISING A CARBURETOR HAVING A THROTTLE, A VENTURI AND A MANIFOLD, SAID VENTURI AND MANIFOLD EACH PROVIDING A SOURCE OF VACUUM, A FLUID MOTOR CONNECTED TO SAID THROTTLE FOR CONTROLLING THE MOVEMENT OF SAID THROTTLE, AN ENGINE SPEED GOVERNOR FOR DETERMINING THE CUT-OFF SPEED FOR THE ENGINE, AN AIR BLEED PASSAGE CONNECTING SAID MOTOR TO THE ATMOSPHERE THROUGH SAID GOVERNOR TO PREVENT OPERATION OF SAID MOTOR, SAID BLEED PASSAGE BEING SUBSTANTIALLY CLOSED TO ATMOSPHERE BY THE GOVERNOR UPON THE APPROACHING OF THE CUT-OFF SPEED, A CUT-OFF VALVE ASSEMBLY INCLUDING A HOUSING, A WALL DIVIDING SAID HOUSING INTO A PAIR OF CHAMBERS, A VALVE SEAT IN ONE OF SAID CHAMBERS, A DIAPHRAGM IN THE OTHER OF SAID CHAMBERS WHICH IS SUBJECTED ON ONE SIDE THEREOF TO ATMOSPHERIC PRESSURE, A VALVE STEM CONNECTED ON ONE END TO SAID DIAPHRAGM AND EXTENDING THROUGH AN OPENING IN SAID WALL INTO SAID ONE CHAMBER, A VALVE ON THE OTHER END OF SAID STEM, WHICH COOPERATES WITH SAID VALVE SEAT TO FORM A VARIABLE ORIFICE, MEANS SEALING THE OPENING IN SAID WALL THROUGH WHICH SAID STEM EXTENDS, AND RESILIENT MEANS BIASING SAID VALVE TOWARDS SAID VALVE SEAT, A FIRST PASSAGE CONNECTED TO SAID MANIFOLD AT A POINT BELOW THE THROTTLE WHEN THE THROTTLE IS IN A CLOSED POSITION, SAID FIRST PASSAGE LEADING FROM SAID MANIFOLD TO SAID ONE CHAMBER THROUGH SAID VARIABLE ORIFICE AND TO SAID OTHER CHAMBER AT THE OTHER SIDE OF SAID DIAPHRAGM, A SECOND PASSAGE CONNECTING SAID VENTURI TO SAID ONE CHAMBER, AND A THIRD PASSAGE CONNECTING SAID AIR BLEED PASSAGE TO SAID ONE CHAMBER, SAID DIAPHRAGM BEING RESPONSIVE TO THE DIFFERENCE IN MANIFOLD VACUUM AND ATMOSPHERIC PRESSURE WHICH IS EFFECTIVE TO MOVE SAID VALVE MEMBER AWAY FROM SAID VALVE SEAT AGAINST SAID RESILIENT MEANS AT SPEEDS BELOW THE AFORESAID CUT-OFF SPEED TO CONNECT THE MANIFOLD AND VENTURI VACUUMS TO SAID AIR BLEED PASSAGE, AND WHICH IS EFFECTIVE UPON THE APPROACHING OF THE AFORESAID CUT-OFF SPEED WHEN THE FORCE OF SAID RESILIENT MEANS IS GREATER THAN SAID DIFFERENCE TO MOVE SAID VALVE MEMBER AGAINST SAID VALVE SEAT TO BLOCK THE ENTRY OF MANIFOLD VACUUM INTO SAID ONE CHAMBER TO PREVENT THE BLEEDING OF MANIFOLD VACUUM INTO SAID SECOND PASSAGE, SAID VALVE MEMBER BEING HELD AGAINST SAID VALVE SEAT BY SAID RESILIENT MEANS UNTIL THE MANIFOLD VACUUM INCREASES TO A PREDETERMINED VALUE INITIATED BY THE CLOSING MOVEMENT OF SAID THROTTLE AS CONTROLLED BY THE VENTURI VACUUM ACTING IN SAID MOTOR.