Abstract: An air-powered driving tool for returning the working piston to its driving position by way of an auxiliary piston and valve arrangement. After the fastener is driven, the auxiliary piston is operated to engage the working piston to move it to its driving position after which the auxiliary piston is moved to an inoperative position. A valve is operated to direct high-pressure air to the auxiliary piston to move it to a working piston engaging position and then the air is released to allow it to return to its inoperative position. Thus, there is no force opposing the working piston when the driving tool is operated to drive a fastener into a workpiece.

Abstract: A pneumatic driving system for causing a nail or the like to run out of the barrel of a nailing tool to where its point may be seen by the user for lining up with a hole on the work and subsequently driving the nail into the workpiece.

Abstract: The present invention relates to a novel outlet air muffler for air-powered transportable driving tools such as nailers. The muffler includes an outlet air duct formed in a housing endpiece and the top lid of the nailer. The outlet air duct is made up of two like chamber systems whose chambers are joined together by wall hollows. The chambers are furthermore interconnected through holes leading from the outlet side of the main control valve.

Abstract: The invention relates to a cushioning device for a piston of a pneumatically operable driving tool which includes a cylinder, wherein a drive piston connected to a driver blade is axially movable; including further a bumper at the lower end of the cylinder and an annular chamber connected to a fluid power reservoir; this chamber is located underneath the piston and is surrounding the driver blade. The annular chamber, created by the piston and a wall, generally parallel to the face of the piston, will be reduced in volume to a certain extent when the wall impacts on the bumper to reduce the noise generated during the driving action.

Abstract: A mechanism for collecting debris generated during the driving of a fastening means from a strip of such fastening means. The mechanism consists of a container disposed adjacent the opening of the outlet of the driving tool and air means for directing debris from the outlet of the driving tool into the container.