Patent ID: 8602282
Filing Date: 2013-12-10
Classification: B25C

Abstract:
1. A driving mechanism adapted for use in a fastener driving tool, said driving mechanism comprising: (a) a hollow cylinder having a movable piston therewithin, said hollow cylinder containing a displacement volume created by a stroke of said piston; (b) a guide body that is configured to receive a fastener that is to be driven; (c) a driver member that is in mechanical communication with said piston, said driver member being sized and shaped to push said fastener from said guide body; (d) a main storage chamber that is in fluidic communication at all times with said displacement volume of the cylinder, wherein (i) said main storage chamber and said displacement volume are initially charged with a pressurized gas and remain above atmospheric pressure during all portions of an operating cycle, with no gas replenishment system on-board said tool; and (e) a lifter member that, under first predetermined conditions, moves said driver member from a driven position toward a ready position;