Fuel injection pumps having distributing pistons

Claim 1

A FUEL INJECTION PUMP WHICH COMPRISES, IN COMBINATION, A CYLINDER, A CYLINDRICAL PISTON SLIDABLY MOVABLE IN SAID CYLINDER AND HAVING THEREIN BOTH A RECIPROCATING MOVEMENT IN THE DIRECTION OF ITS AXIS AND A MOVEMENT OF ROTATION ABOUT SAID AXIS, THE END FACE OF SAID PISTON LIMITING, TOGETHER WITH SAID CYLINDER, A WORKING CHAMBER OF VARIABLE VOLUME THE DISPLACEMENTS OF SAID PISTON IN SAID CYLINDER THAT REDUCE THE VOLUME OF SAID WORKING CHAMBER BEING CALLED DELIVERY STROKES, AND THE DISPLACEMENTS OF SAID PISTON THAT INCREASE SAID VOLUME BEING CALLED OUTWARD STROKES, SAID CYLINDER BEING PROVIDED WITH PASSAGES ADAPTED CONDUIT, SAID PISTON BEING PROVIDED WITH AN INLET TO COOPERATE WITH SAID INLET CONDUIT TO PLACE IT IN COMMUNICATION WITH SAID WORKING CHAMBER DURING THE OUTWARD STROKES OF SAID PISTON AND TOCUT OFF SAID COMMUNICCATION, AT LEAST MOSTLY, BY THE EFFECT OT THE ROTATION OF SAID PISTON, BEFORE THE BEGINNING OF EVERY DELIVERY STROKE OF SAID PISTON AND DURING THE TIME WHEN SAID PISTON IS IN ITS OUTER DEAD CENTER POSITION FOR WHICH THE VOLUME OF SAID WORKING CHAMBER IS MAXIMUM, SAID CYLINDER BEING PROVIDED WITH A PLURALITY OF DELIVERY CONDUITS OPENING INTO THE CYLINDRICAL WALL OF SAID CYLINDER AT POINTS DISTRIBUTED AT REGULAR INTERVALS ALONG ITS PERIPHERY, SAID PISTON BEING PROVIDED IN ITS CYLINDRICAL WALL WITH A LONGITUDINAL GROOVE EXTENDING FROM SAID PISTON END FACE TO A DISTANCE THEREFROM SO THAT THE DELIVERY CONDUIT LOCATED OPPOSITE SAID GROOVE REMAINS IN COMMUNICATION WITH SAID WORKING CHAMBER DURING THE WHOLE OF A DELIVERY STROKE OF SAID PISTON, THE OUTER DEAD CENTER POSITION OF SAID PISTON, BEING POSITIONED SO THAT, WHEN SAID PISTON IS IN THIS POSTION, THE OPENINGS OF ALL OF SAID DELIVERY CONDUITS EACH HAVE A PORTION THEREOF IN COMMUNICATION WITH SAID WORKING CHAMBER, THE HEIGHT, MEASURED IN THE AXIAL DIRECTION, OVER WHICH SAID OPENINGS THEN COMMUNICATE WITH SAID WORKING CHAMBER BEING SUFFICIENTLY SMALL TO PREVENT ANY FUEL DELIVERY FROM TAKING PLACE DURING THE INITIAL PORTION OF THE DELIVERY STROKE OF SAID PISTON FOR WHICH SAID PISTON IS TRAVELLING TO CLOSE SAID OPENING AFTER THE CLOSING OF SAID INLET CONDUIT WITH THE EXCEPTION OF THAT IN COMMUNICATION WITH SAID GROOVE AND SPRING LOADED CHECK VALVES MOUNTED IN SAID DELIVERY CONDUITS, RESPECTIVELY.