Turbine engine fuel control

Claim 1

IN A FUEL CONTROL FOR A TURBINE TYPE POWER PLANT INCLUDING A COMPRESSOR, COMBUSTION CHAMBER AND TURBINE IN SERIAL FLOW RELATION AND FUEL SUPPLY MEANS OPERABLE TO SUPPLY FUEL TO SAID COMBUSTION CHAMBER AT FLOW RATES VARIABLE IN ACCORDANCE WITH POSITION OF A FUEL CONTROL ELEMENT, FORCE BALANCE SERVO MEANS FOR POSITIONING SAID CONTROL ELEMENT TO PROVIDE FUEL FLOW RATES VARYING DIRECTLY WITH AN APPLIED FORCE, MEANS RESPONSIVE TO COMPRESSOR DISCHARGE PRESSURE TO GENERATE A FORCE VARYING DIRECTLY THEREWITH, FORCE MULTIPLIER MEANS COUPLING SAID COMPRESSOR DISCHARGE PRESSURE DERIVED FORCE TO SAID SERVO MEANS AND INCLUDING A RATIO ADJUSTMENT MEMBER MOVABLE TO VARY THE FORCE MULTIPLICATION RATIO AFFORDED BY SAID MULTIPLIER MEANS, A CAM MEMBER HAVING A PAIR OF CAMMING SURFACES, MEANS OPERABLE TO POSITION SAID CAM MEMBER AS A FUNCTION OF ENGINE SPEED, A PAIR OF CAM FOLLOWERS EACH ADAPTED TO ENGAGE ONE OF SAID CAMMING SURFACES, FIRST LEVER MEANS CARRYING ONE OF SAID CAM FOLLOWERS ADJACENT ONE END THEREOF AND PIVOTED INTERMEDIATE ITS END TO MOVABLE PIVOT MEANS, THROTTLE LEVER MEANS CONNECTED TO SHIFT SAID MOVABLE PIVOT MEANS WITH CHANGE IN THROTTLE LEVER POSITION, SECOND LEVER MEANS CARRYING THE OTHER OF SAID CAM FOLLOWERS ADJACENT ONE END THEREOF AND PROVIDED WITH FIXED PIVOT MEANS INTERMEDIATE ITS ENDS, LINKAGE MEANS ADAPTED TO ENGAGE THE FREE ENDS OF EITHER OR BOTH SAID FIRST AND SECOND LEVER MEANS AND INCLUDING A FLOATING LEVER CONNECTED AT ONE END TO SAID MULTIPLIER RATIO ADJUSTMENT MEMBER AND HAVING SEPARABLE ENGAGEMENT WITH FIXED PIVOT MEANS INTERMEDIATE ITS ENDS, A LOADING SPRING CONNECTED TO SAID LINKAGE MEANS URGING SAID FLOATING LEVER AGAINST ITS PIVOT AND SAID LINKAGE MEANS INTO ENGAGEMENT WITH SAID FIRST LEVER MEANS FOR STEADYSTATE ENGINE SPEED CONTROL ABOUT A CONTROL POINT DETERMINED BY THROTTLE LEVER POSITION AND INTO ENGAGEMENT WITH SAID SECOND LEVER MEANS FOR FUEL LIMITING AS A FUNCTION OF ENGINE SPEED, AND FIXED STOP MEANS LIMITING MOVEMENT OF SAID MULTIPLIER RATIO ADJUSTMENT MEMBER IN THE DIRECTION PROVIDING REDUCED FORCE MULTIPLICATION RATIO AND THUS MAINTAIN A CONSTANT RATIO BETWEEN ENGINE FUEL FLOW AND COMPRESSOR DISCHARGE PRESSURE SO LONG AS SAID MULTIPLIER RATIO ADJUSTMENT MEMBER REMAINS IN ENGAGEMENT WITH SAID FIXED STOP MEANS.