Piston powder actuated tool

Claim 1

A POWER ACTUATED TOOL COMPRISING, (A) CONNECTED BREECH AND BARRAL ASSEMBLIES; (B) SAID BARREL ASSEMBLY INCLUDING A HOUSING AND AN ELONGAED TUBULAR BARREL DISPOSED WITHIN THE HOUSING; (C) SAID BARREL HAVING MUZZLE AND BREECH ENDS AND WALLS DEFINING A PASSAGE EXTENDING FROM THE MUZZLE TO THE BREECH END; (D) SAID BARREL PASSAGE INCLUDING: (I) A MUZZLE PORTION ADJACENT THE MUZZLE END; (II) A FASTENER RECEIVING PORTION OF A DIAMETER LARGER THAN THE MUZZLE PORTION IN AXIAL ALIGNMENT WITH THE MUZZLE PORTION AND REARWARD OF THE MUZZLE PORTION; AND, (III) A PISTON PORTION OF A DIAMETER LARGER THAN THE FASTENER PORTION AND BETWEEN THE FASTENER PORTION AND THE BREECH END OF THE GUN; (E) SAID PASSAGE INCLUDING A FASTENER ARRESTING SHOULDER BETWEEN THE MUZZLE PORTION AND THE FASTENER PORTION AND A PISTON STOP SURFACE BETWEEN THE FASTENER PORTION AND THE PISTON PORTION; (F) A PISTON ASSEMBLY TELESCOPED INTO THE PISTION PORTION AND INCLUDING AND ELONGATED RECIPROCAL PISTON AND SURROUNDING SLEEVE; (G) SAID PISTON INCLUDING A REARWARD ENLARGED HEAD RECIPROCALLY DISPOSED IN THE SLEEVE AND A FORWARDLY EXTENDING RAM OF A SIZE ADAPTED TO TELESCOPE CLOSELY INTO THE MUZZLE PORTION OF THE BARREL PASSAGE; (H) SAID SLEEVE BEING POSITIONED IN THE PISTON PORTION OF THE BARREL PASSAGE AND INCLUDING LONGITUDINALLY DISPOSED SLOTS NEAR ITS FOREWARD END DEFINING GAS PORTS; (I) CARTRIDGE IGNITION MEANS CARRIED BY THE BREECH ASSEMBLY, SAID PISTON ASSEMBLY INCLUDING A BREECH MEMBER SECURED TO THE SLEEVE AND INTEPOSED BETWEEN THE BARREL AND THE BREECH ASSEMBLY; AND, (J) SAID BREECH MEMBER INCLUDING A CARTRIDGE RECEIVING CHAMBER IN FLUID COMMUNICATION WITH THE BARREL PASSAGE.