Pivot-load powder actuated tool with firing chamber insert

摘要

This powder actuated tool is designed to fire high power loads, such as 32 caliber blanks, to drive a member into a concrete surface. The tool has a housing and a reciprocating barrel mounted on the housing. The firing mechanism is contained in a breech block which is reciprocable in the housing. The cartridge chamber is disposed in the breech end of the barrel in a member which is freely slidably removable from the barrel in a breechward direction. The member is provided with empty external gas sealing grooves which prevent substantial breechward movement of the cartridge chamber member when the tool is fired. There is no mechanical lock between the breech block and the breech end of the barrel. Reciprocal movement of the barrel is controlled by guide lugs on the muzzle end of the housing and mating guide slots formed in the exterior of the barrel. The lugs and mating slots allow longitudinal and pivotal movement of the barrel assembly between breech closed and breech open positions and also allow rotational movement of the barrel when in its breech closed position. The rotational movement is required before the tool can be cocked for firing. The slots also allow the barrel assembly to be completely removed from the housing without the use of any special tools.