Patent ID: 6722232
Filing Date: 2004-04-20
Classification: B25B

Abstract:
A manually-powered drive device comprising:a pistol-shaped, hollow housing comprising a barrel portion and a hand grip portion separated by an intermediate frame portion, the barrel portion and the hand grip portion extending substantially perpendicularly from one another; and a drive train substantially disposed within the pistol-shaped housing, the drive train configured to transmit motion and driving force and comprising: a transmission assembly comprising a transmission shaft extending laterally in the intermediate frame portion and comprising first and second circumferential recesses, the transmission shaft configured to laterally slide between alternate positions; a transmission selector spring comprising a protrusion for one end portion thereof, the protrusion configured to flex and removably slidably couple within the first circumferential recess or the second circumferential recess as the transmission shaft laterally slides between alternate positions, thereby selecting the desired rotational direction for manipulating fasteners; and a trigger assembly comprising: a geared trigger comprising a spatulate lower portion, an intermediate portion, and an angled upper portion, the spatulate lower portion configured to be gripped by an operators hand, the intermediate portion comprising a first aperture there through, and the angled upper portion comprising an arcuate transverse slot there through and an arcuate gear rack, the geared trigger configured to initiate the motion and driving force during its drive and return strokes; a torsion trigger spring comprising a first trigger spring end portion configured for coupling with the geared trigger and a second trigger spring end portion configured for coupling with an internal portion of the pistol-shaped housing, the torsion trigger spring configured to bias the geared trigger in a disengaged position after each drive stroke; a trigger stop shaft extending through the arcuate transverse slot, the trigger stop shaft configured to limit the displacement of the geared trigger between the drive and return strokes; and a trigger shaft extending through the first aperture, the trigger shaft configured to allow the geared trigger to pivot thereon between the drive and return strokes.