B - Operations – Transporting – 25 – C
B25C 1/04 (2006.01) B25C 1/00 (2006.01)
FASTENER DRIVING TOOL Abstract of the Disclosure A tool for driving fasteners includes a casing defining a nose portion and a handle portion within which is a reservoir for pressurized fluid. A driver is mounted in the nose portion that is reciprocated by a piston attached thereto and an assembly for returning the piston to a static position after a driving stroke is also included. The return assembly includes a chamber in fluid communication through an inlet with pressurized air and with an outlet that is in communication with a location beneath the return piston. A diaphragm is mounted within the chamber and is biased by a shoe and spring into sealing engagement with the inlet and the outlet. Another metered inlet is also included in the chamber that is in fluid communication with the source of pressurized fluid and controls the sealing action of the diaphragm. The chamber for the return assembly is also in fluid communication with a second chamber within which is mounted a differential area piston. The piston includes a feed pawl for feeding fasteners to the driver from a magazine. The magazine is defined by two identical portions that are reversed upon assembly. Fasteners for the tool are fed from the magazine to the driver on a tape and each fastener is held by at least one tab. To prevent the fasteners from dislodging from the tape, the tool includes a shoe biased into engagement with the fastener and the tab.
Geist Bernard W.
Novak Raymond F.
Smart & Biggar
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