Injector chamber construction

Claim 1

A FUEL AND OXIDIZER INJECTOR FOR ROCKET ENGINES AND THE LIKE, COMPRISING A TUBULAR HOUSING HAVING AN INNER TUBULAR CASING CONCENTRICALLY SPACED FROM SAID HOUSING AND DEFINING AN ANNULAR FUEL FLOW PASSAGE BETWEEN SAID HOUSING AND SAID CASING, A PLURALITY OF NOZZLES CONNECTED TO ONE END OF SAID HOUSING AND IN COMMUNICATION WITH SAID ANNULAR FUEL FLOW PASSAGE, AN APERTURED SPIKE MEMBER MOUNTED ON SAID ONE END OF THE HOUSING AND PROJECTING INTO THE INNER CASING, SAID INNER CASING ADAPTED TO RECEIVE A COLLAPSIBLE, FOLDABLE AND READILY PUNCTURABLE SEALED OXIDIZER BAG, SAID APERTURED SPIKE IN CONFRONTING RELATION TO SAID BAG, A PISTON MEMBER RECEIVED IN THE OPPOSITE END OF SAID CASING AND BACKING SAID BAG, A FUEL INLET MOUNTED ON THE OPPOSITE END OF SAID HOUSING AND HAVING A PASSAGE THEREIN COMMUNICATING WITH THE HOUSING INTERIOR AND DIRECTING FUEL TO SAID ANNULAR FUEL FLOW PASSAGE AND AGAINST SAID PISTON MEMBER AND DRIVING ONE END OF THE BAG AGAINST THE SPIKE MEMBER TO RELEASE OXIDIZER FOR FLOW THROUGH THE APERTURE IN THE SPIKE MEMBER WHILE FUEL IS FLOWING THROUGH SAID NOZZLES, THE BAG WHEN ESSENTIALLY COMPLETELY FOLDED AND COLLAPSED BEING RECEIVED BETWEEN THE PISTON AND SPIKE MEMBER FOR SEALING THE APERTURE IN THE SPIKE MEMBER TO PREVENT OXIDIZER FLOW THERETHROUGH.