Patent ID: 7913889
Filing Date: 2011-03-29
Classification: B25C

Abstract:
1. A fastener driving apparatus comprising: a pneumatic motor with an output shaft configured to drive a fastener; a nose configured to eject a fastener, the nose including a door having a closed position to guide a fastener driven by the output shaft and an open position permitting a jammed fastener to be removed from the nose; a piston/cylinder assembly including a variable volume pneumatic pressure chamber with a port, a piston linked to the door so as to move the door into the closed position under the force of pressure in the chamber, and a spring biasing the piston against the force of pressure in the chamber; a coupling configured to receive elevated pneumatic pressure; and a pneumatic line communicating the coupling with the port to pressurize the chamber when the coupling receives elevated pneumatic pressure and to vent the chamber when the coupling does not receive elevated pneumatic pressure.