Compression pressure fuel injector

Claim 1

A FUEL INJECTOR COMPRISING A HOUSING HAVING A BORE THEREIN WITH ONE SIDE OF SAID BORE BEING OPEN FOR ADMITTING GAS THEREIN, A PISTON MOVABLY DISPOSED IN SAID BORE AND HAVING ONE END SEATING ON THE OPENING IN SAID ONE SIDE FOR CONTROLLING GAS FLOW THERETHROUGH, THE OTHER END OF SAID PISTON INCLUDING A CIRCULAR HELIX SURFACE AND DEFINING A PRESSURE CHAMBER IN SAID BORE, SAID PISTON HAVING A FUEL PASSAGEWAY EXTENDING FROM SAID PRESSURE CHAMBER TO SAID OPENING, CHECK VALVE MEANS IN SAID PASSAGEWAY FOR CONTROLLING FUEL FLOW THERETHROUGH, SAID HOUSING HAVING A FUEL INLET PORT AND A FUEL OUTLET PORT BOTH IN FUEL-FLOW COMMUNICATION WITH SAID PRESSURE CHAMBER, A JACKET ROTATABLY MOUNTED IN SAID BORE AND FLUID TIGHTLY DISPOSED ON SAID HELIX SURFACE AND HAVING A PORT IN FUEL-FLOW COMMUNICATION WITH SAID PRESSURE CHAMBER AND IN THE PATH OF MOVEMENT OF SAID HELIX SURFACE FOR ALTERING THE FLOW OF FUEL WITH RESPECT TO SAID CHAMBER ACCORDING TO THE ROTATIVE POSITION OF SAID JACKET, AND POSITIVE ENGAGING MEANS FOR ROTATING SAID JACKET.