Diesel fuel injector

Claim 1

IN A FUEL INJECTOR FOR AN INTERNAL COMBUSTION ENGINE WHICH ENGINE IS OF THE CLASS HAVING A CYLINDER AND RECIPROCATING ENGINE PISTON THEREIN, THE COMBINATION COMPRISING MEANS DEFINING A FUEL CHAMBER AT THE HEAD OF SAID CYLINDER WHICH CHAMBER IS COMMUNICATED WITH SAID CYLINDER THROUGH A NARROW INJECTION PASSAGE, A MOVABLE INJECTOR PISTON DISPOSED AT THE HEAD OF SAID CYLINDER WHICH INJECTOR PISTON HAS A FIRST END EXPOSED TO THE HEAD PRESSURE OF SAID CYLINDER AND WHICH HAS A SMALLER SURFACE OPPOSITE SAID FIRST END WHICH SURFACE BEARS ON SAID FUEL CHAMBER TO RAISE THE PRESSURE THEREIN TO A VALUE HIGHER THAN SAID HEAD PRESSURE, A VALVE ELEMENT MOVABLE TO CLOSE SAID INJECTION PASSAGE FROM SAID FUEL CHAMBER, SAID VALVE ELEMENT BEING EXPOSED TO THE PRESSURE WITHIN SAID CHAMBER ACTING IN A DIRECTION TO MOVE SAID ELEMENT TO OPEN SAID PASSAGE, A FIRST RESILIENT MEANS BEARING AGAINST SAID VALVE ELEMENT IN A DIRECTION TO CLOSE SAID PASSAGE WHEREBY INJECTION OF FUEL INTO SAID CYLINDER DOES NOT OCCUR UNTIL THE PRESSURE THEREIN REACHES A VALUE CAPABLE OF OVERCOMING THE FORCE OF SAID RESILIENT MEANS ON SAID VALVE ELEMENT, A SECOND RESILIENT MEANS BEARING AGAINST SAID VALVE ELEMENT ONLY AFTER A DEGREE OF TRAVEL THEREOF, AND MEANS FORMING A VENT PASSAGE COMMUNICATING WITH SAID FUEL