Breech sealing means for automatic firearms adapted to fire caseless ammunition

Claim 1

IN A FIREARM, A FIXED BARREL HAVING A FIRING CHAMBER THEREIN ADAPTED TO SEAT A CASELESS CARTRIDGE WITH A COMBUSTIBLE PRIMER IN THE REAR END THEREOF, A RECIPROCAL BOLT HAVING A RECESS IN THE FRONT FACE THEREOF FOR RECEIVING THE REAR END OF THE CARTRIDGE AND HAVING A FIRING PIN HOLE THERETHROUGH IN COMMUNICATION WITH SAID RECESS, A FLEXIBLE DIAPHRAGM HAVING AN INTEGRAL STRIKER PROJECTING FORWARDLY THEREFROM, MEANS FOR RETAINING SAID DIAPHRAGM WITHIN SAID RECESS WITH SAID STRIKER NORMALLY OUT OF CONTACT WITH THE PRIMER IN THE CARTRIDGE, RESILIENT MEANS ENCIRCLING THE REAR END OF THE CARTRIDGE IN CONTACT WITH THE INTERFACE BETWEEN SAID BOLT AND SAID BARREL, AND A FIRING PIN SLIDABLY DISPOSED IN SAID BOLT FOR FLEXING SAID DIAPHRAGM TO ADVANCE SAID STRIKER INTO FIRING CONTACT WITH THE PRIMER IN THE CARTRIDGE WHEREBY SAID DIAPHRAGM AND SAID RESILIENT MEANS RESPECTIVELY OBTURATE SAID FIRING PIN HOLE AND SAID INTERFACE BETWEEN SAID BOLT AND SAID BARREL IN RESPONSE TO THE PRESSURE GENERATED BY THE COMBUSTION GASES EVOLVED UPON THE FIRING OF THE CARTRIDGE.