Patent ID: 6378752
Filing Date: 2002-04-30
Classification: B25C,F41A

Abstract:
A device for driving a fastener, comprising:a housing having a first bore; a piston and a piston guide disposed in the first bore, said piston having a combustion end and a ramming end; a combustion chamber disposed adjacent the combustion end of the piston; a reset stop disposed in the first bore for limiting travel of the piston within the first bore away from the combustion chamber, the reset stop being in a fixed position with respect to the housing; a head portion having a second bore coaxial with the first bore, one end of the second bore adapted to receive the ramming end of the piston, and the other end of the bore adapted to receive a fastener to be impacted by the ramming end of the piston, the head and the housing being slidably engageable along the axis of the first and second bores; and a spring disposed between and urging the head and the housing apart along the axis of the bores; the first bore extending to and connecting with a vertical bore; and an advance lever having a reset end and an advancing end, said lever disposed on a pivot orthogonal skew to the axis of the first bore, the lever having an axis essentially parallel with the longitudinal bore, the advancing end of the lever attached on an arm of the lever angled to one side of the axis of the longitudinal bore and effective to engage teeth on the side of a strip of charges disposed in the vertical bore, the reset end of the lever being disposed on the same side of the axis of the longitudinal bore and engaging the piston guide along an edge of the lever.