refinement tools operated by office esplosiv

摘要

A power-actuated fastening tool of the type for driving fasteners by a propellant charge wherein a fastener driving member has an enlarged head portion. The head portion is so designed that a portion of the gases generated by the propellant charge may bleed from the rearward side to the forward side thereof to reduce recoil and buffer the fastener driving member. In addition, a specially designed piston member is provided for driving threaded fasteners wherein the piston has a bore extending into its forward end with the innermost portion of the bore being defined by a conical wall. The tool is so designed that power adjustment is obtained by positioning the piston member into its driving position by insertion of a fastener into the muzzle end of the tool. The barrel guide slot and pawl member are so designed that upon opening of the tool, there will be planar contact between the two members.