Patent ID: 7946464

Claim:
An actuator housing for use on a pneumatic nailer, said actuator housing comprising: a casing, at least partially hollow, defining a cartridge insertion opening; a selectively activated actuator cartridge which can be inserted in said casing through said cartridge insertion opening, said actuator cartridge comprising: an actuator head for sealing engagement with said cartridge insertion opening of said casing, said actuator head extending at least partially outwardly of said casing, a piston assembly received at least partially within said casing, said piston assembly comprising a tubular member defining a tubular member chamber therein and a plunger at least partially movably mounted within said tubular member chamber; first means for fastening said actuator head to said tubular member of said piston assembly; and releasable second means for fastening said actuator cartridge releasably to said casing; wherein upon selective activation of said actuator cartridge, said plunger is actuated along said tubular member chamber for striking a fastener, and wherein said second means for fastening can be released to disconnect said actuator cartridge from said casing; wherein said tubular member is a cylinder, and said tubular member chamber is a cylinder chamber; and wherein said second means for fastening comprise an annular threaded section of said actuator head and an annular threaded section of said cartridge insertion opening, to allow said actuator head to be screwed into said cartridge insertion opening.