Altitude compensated charge forming device

Claim 1

A CHARGE FORMING DEVICE FOR AN INTERNAL COMBUSTION ENGINE COMPRISING AN INDUCTION PASSAGE, A THROTTLE VALVE IN SAID INDUCTION PASSAGE, A FUEL SOURCE, FUEL DISCHARGE CIRCUIT MEANS CONNECTING SAID FUEL SOURCE WITH SAID INDUCTION PASSAGE FOR DISCHARGINGK FUEL INTO SAID INDUCTION PASSAGE, METERING VALVE MEANS IN SAID FUEL DISCHARGE CIRCUIT MEANS FOR REGULATING THE RATE OF FUEL DISCHARGE INTO SAID INDUCTION PASSAGE, SAID METERING VALVE MEANS COMPRISING A METERING JET THROUGH WHICH AT LEAST A PORTION OF THE FUEL DISCHARGE PASSAGE PASSES AND A METERING ROD ADAPTED TO BE INSERTED VARYING DEPTHS INTO SAID METERING JET, SAID METERING ROD HAVING A SUBSTANTIALLY UNIFORM CROSS-SECTIONAL AREA AND SHAPE ALONG AT LEAST A PORTION OF THE LENGTH THAT IS ADAPTED TO BE INSERTED INTO SAID METERING JET WHEREBY THE CROSS-SECTIONAL FLOW AREA IS RELATIVELY INDEPENDENT OF THE DEGREE OF INSERTION OF SAID METERING ROD INTO SAID METERING JET, THE EXTERNAL SURFACE OF SAID METERING ROD HAVING A PREDETERMINED SURFACE FINISH TO OFFER A FRICTIONAL RESISTANCE TO FLOW DEPENDENT UPON THE DEPTH OF INSERTION, POWER VALVE MEANS IN SAID FUEL DISCHARGE CIRCUIT MEANS RESPONSIVE TO THE PRESSURE IN SAID INDUCTION PASSAGE POSTERIOR TO SAID THROTTLE VALVE, SAID POWER VALVE MEANS BEING ADAPTED TO OPEN AT A PREDETERMINED PRESSURE TO PROVIDE ADDITIONAL FUEL FLOW INTO SAID INDUCTION PASSAGE IN RESPONSE TO INCREASED ENGINE POWER DEMAND, AN ALTITUDE RESPONSIVE DEVICE, AND MEANS OPERATIVELY CONNECTING SAID ALTITUDE RESPONSIVE DEVICE TO SAID POWER VALVE AND TO SAID METERING ROD FOR SIMULTANEOUSLY ADJUSTING THE PRESSURE AT WHICH SAID POWER VALVE OPENS AND THE DEPTH OF INSERTION OF SAID METERING ROD INTO SAID METERING JET IN RESPONSE TO ALTITUDE VARIATIONS.