Patent 7021511 was granted and assigned to Illinois Tool Works on April, 2006 by the United States Patent and Trademark Office.
A fastener driving tool comprises a tool body, a muzzle extending forwardly from the tool body and being displaceable into a ready-to-fire position, a magazine for holding fasteners coupled to the muzzle, and a follower within the magazine that biases the fasteners. The follower has a blocking surface that blocks the muzzle during fastener-empty condition and prevents the muzzle from displacing into ready-to-fire position.