Material breaking cartridge

Claim 1

IN COMBINATION; A CYCLINDRICAL CARTRIDGE BODY HAVING ARRANGED SUCCESSIVELY LONGITUDINALLY THEREOF IN THE ORDER NAMED A CYLINDRICAL RELEASE CHAMBER IN WHICH A MATERIAL BREAKING CHARGE OF COMPRESSED GAS IS TO BE DEVELOPED AND FROM WHICH THE CHARGE IS TO BE RELEASED, LATERAL GAS CHARGE RELEASE PORT, AND A CYLINDRICAL CONTROL CHAMBER; MEANS PROVIDING AN ANNULAR VALVE SEAT AT THE END OF SAID RELEASE CHAMBER ADJACENT SAID RELEASE PORTS, A CYLINDRICAL DISCHARGE VALVE SLIDABLE IN SAID CONTROL CHAMBER AN OVERLYING SAID RELEASE PORTS, MEANS BIASING ONE END OF SAID DISCHARGE VALVE INTO SEALING ENGAGEMENT WITH SAID VALVE SEAT, SAID DISCHARGE VALVE HAVING A PASSAGEWAY THERETHROUGH TO PERMIT THE FLOW OF GAS FROM SAID RELEASE CHAMBER TO SAID CONTROL CHAMBER AT A RATE THAT WILL EQUALIZE THE GAS PRESSURE IN SAID CONTROL AND RELEASE CHAMBERS WHILE SAID SEALING ENGAGEMENT IS MAINTAINED WITH SAID VALVE SEAT, MEANS FOR LOWERING THE GAS PRESSURE IN SAID CONTROL CHAMBER TO A VALVE SUBSTANTIALLY BELOW THAT OF THE GAS IN SAID RELEASE CHAMBER THEREBY PERMITTING THE GAS PRESSURE IN SAID RELEASE CHAMBER TO MOVE SAID DISCHARGE VALVE AWAY FROM SAID VALVE SEAT AND TO UNCOVER SAID LATERAL GAS CHARGE RELEASE PORTS AND THE COMPRESSED GAS TO BE DISCHARGED THERETHROUGH, SAID DISCHARGE VALVE HAVING AT LEAST ONE BLEED DOWN PORT PLACING SAID CONTROL CHAMBER IN COMMUNICATION WITH ONE OF SAID RELEASE PORTS, AND A BLEED DOWN VALVE SLIDABLY CARRIED BY SAID DISCHARGE VALVE, SAID BLEED DOWN VALVE HAVING SURFACE ON ONE PART ACTED ON BY THE EQUALIZED GAS PRESSURE AND IN CLOSED POSITION ANOTHER PART CLOSING OFF SAID BLEED DOWN PORT IN RESPONSE TO SAID EQUALIZED GAS PRESSURE, SAID BLEED DOWN VALVE HAVING ANOTHER SURFACE ON SAID ONE PART AGAINST WHICH GAS PRESSURE DERIVED FROM SAID EQUALIZED GAS PRESSURE REACTS TO URGE SAID BLEED DOWN VALVE IN A DIRECTION TO MOVE SAID OTHER PART TO OPEN SAID BLEED DOWN PORT, SAID BLEED DOWN VALVE HOLDING SAID OTHER PART IN POSITION CLOSING OFF SAID BLEED DOWN PORT UNTIL SAID DISCHARGE VALVE IS MOVED AS AFORESAID WHEREUPON SAID DERIVED GAS PRESSURE MOVES SAID BLEED DOWN VALVE TO OPEN POSITION AND SAID CONTROL CHAMBER IS VENTED TO THE ATMOSPHERE THROUGH SAID BLEED DOWN PORT.