Fuel pump drive

Claim 1

IN A FUEL PUMP DRIVE FOR AN INTERNAL COMBUSTION ENGINE HAVING AN ENGINE FRAME AND A ROTATING SHAFT MOUNTED IN SAID FRAME AND A FUEL PUMP EMOVABLY MOUNTED ON SAID FRAME, AN AXIAL PASSAGE IN SAID FRAME EXTENDING FROM AN EXTERIOR SURFACE THEREOF TO A POSITION ADJACENT SAID ROTATING SHAFT SAID FUEL PUMP MOUNTED AT THE EXTERIOR OPENING OF SAID PASSAGE AND HAVING A RECIPROCATING DRIVE SHAFT ALIGNED WITH AND EXTENDING INTO SAID PASSAGE AND BEING VARIABLY POSITIONED BY THE FUEL PUMP FROM A MAXIMUM STROKE POSITION TO A MINIMUM STROKE POSITION IN ACCORDANCE WITH FUEL DEMAND, THE IMPROVEMENT COMPRISING A CAM ADAPTED TO BE MOUNTED ON THE ENGINE ROTATING SHAFT, A PUSH ROD ADAPTED TO BE RECIPROCABLY MOUNTED WITHIN THE LOWER PORTION OF SAID PASSAGE AND OPERATIVELY ENGAGING SAID CAM AND EXTENDING BETWEEN SAID CAM AND THE END OF THE FUEL PUMP RECIPROCATING DRIVE SHAFT TO VARIABLY RECIPROCATE SAME IN RESPONSE TO THE OPERATION OF SAID CAM ACCORDING TO THE COMBINED EFFECT THEREON OF SAID FUEL PUMP AND CAM, A SPRING SUPPORTED BY THE WALLS OF SAID PASSAGE AND ACTING ON SAID PUSH ROD TO CONSTANTLY URGE SOME SOLIDLY AGAINST SAID CAM, SAID PUSH ROD AND RECIPROCATING DRIVE SHAFT BEING SEPARABLY ENGAGEABLE TO PERMIT THE OPERATION OF THE FUEL PUMP AT A STROKE LESS THAN THE LIFT OF SAID CAM WHEN THE RECIPROCATING DRIVE SHAFT IS POSITIONED OTHER THAN AT MAXIMUM STROKE POSITION, A COUPLING SECURED ON THE END OF SAID PUSH ROD OPPOSITE SAID CAM AND HAVING AN AXIALLY DISPOSED CYLINDER THEREIN, SAID CYLINDER BEING ADAPTED TO RECIPROCALLY RECEIVE THE INNER END OF SAID RECIPROCATING DRIVE SHAFT FOR GUIDING SAME, AND A NON-METALLIC ELEMENT DISPOSED BETWEEN THE SEPARABLY ENGAGEABLE ENDS OF SAID PUSH ROD AND RECIPROCATING DRIVE SHAFT WHEREBY SAID FUEL PUMP IS PROVIDED WITH A FUEL PUMP DRIVE PRACTICIALLY FREE FROM OPERATIONAL NOISES.