Pump with delivery adjustment

Claim 1

A FILLING PUMP COMPRISING A PUMP HOUSING, A HOLLOW CYLINDER LOCATED THEREIN, A RECIPROCATING PISTON SLIDABLY MOUNTED IN THE CYLINDER AND EXTENDING OUTWARDLY FROM THE REAR END THEREOF, A DISCHARGE NOZZLE MOUNTED AT THE FORWARD END OF THE CYLINDER AND EXTENDING FORWARDLY THEREBEYOND, SPRING MEANS BIASING THE NOZZLE FORWADLY TO A CLOSED POSITION RELATIVE TO THE CYLINDER, AN INTAKE PORT OF THE INTERIOR OF THE CYLINDER POSITIONED FORWARD OF THE PISTON WHEN SAID PISTON IS N ITS RETRACTED POSITION, AND REARWARD OF THE NOZZLE, A VALVE SEAT MOUNTED IN THE FORWARD END OF THE CYLINDER, SAID VALVE SEAT HAVING A RECESS FORMED IN ITS INNER END, THE NOZZLE BEING SLIDABLY RECEIVED WITHIN THE VALVE SEAT AND HAVIONG AN ENLARGE VALVE HEAD ENGAGEABLE WITHIN THE RECESS AND BIASED THERETO BY SAID SPRING MEANS, A LONGITUDINALLY EXTENDING BORE EXTENDING INWARDLY FROM THE FROWARD END OF SAID NOZZLE, A PLURALITY OF APERTURES LOCATED FORWARD OF THE ENLARGED VALVE HEAD AND IN COMMUNICATION WITH THE BORE SO AS TO PROVIDE A FLUID PASSAGE BETWEEN THE CYLINDER AND THE NOZZLE BORE UPON A REARWARD MOVEMENT OF THE NOZZLE AGAINST THE BIAS OF THE SPRING, AND MEANS FOR EFFECTING A PERIODIC FORWARD AND REARWARD MOVEMENT FO THE PISTON, SAID CYLINDER BEING SLIDABLY MOUNTED FOR LIMITED MOVEMENT IN RESPONSE TO MOVEMENT OF THE PISTON SO AS TO ENGAGE THE FORWARD END OF THE NOZZLE WITH A STATIONARY ITEM TO BE FILLED, WITH A CONTINUING FORWARD MOVEMENT OF THE CYLINDER CAUSING THE REARWARD MOVEMENT OF THE NOZZLE RELATIVE TO THE VALVE SEAT RESULTING IN THE OPENING OF THE APERTURES AND THE FLOWING OF FLUID THERETHROUGH.