Abstract: A pneumatic fastener driving tool includes a return system for efficiently and rapidly returning a drive piston to the static position and effecting a fastener feeding operation. A housing defines a pressure fluid reservoir connected by a pneumatic control system to a first side of a drive piston to move a driver blade through a drive track in a drive stroke. A pressure fluid actuated fastener feed assembly advances fasteners along a feed path to the drive track. Following a drive stroke, the return system connects the reservoir to the second side of the drive piston for moving the drive piston and driver blade in a return stroke. The return system also connects the reservoir to the fastener feeding assembly for feeding of a fastener. The return system includes two separate return valves operable at different flow capacities and fluid pressures for drive piston return and for fastener feeding.

Abstract: An electric fastener driving tool includes a body of a clam-shell construction formed of two body parts that define a head and handle portions. An open bottom magazine assembly is attached to the tool for supplying fasteners to be driven. The tool also includes a removable nose piece defining a portion of a drive track for a driving blade mounted in the tool. The nosepiece includes different workpiece engaging surfaces on opposite ends such that the tool may be used to drive fasteners into different types of workpieces. The tool further includes a double cone spring for returning the driver to its at rest position.