Patent ID: 6457385
Filing Date: 2002-10-01
Classification: B25B

Abstract:
A precision driver rotation structure comprising a handle, a bushing, a shank, a rotation plate, a knob, and multiples of planet gears, wherein,said handle being a hollow tube with a containing base formed at its top of said tube; said containing base formed an accommodation space having its inner wall provided with a meshing gear; and a bushing plugged to the lower end of said tube; said shank inserting through said handle and having formed a blade at its lower tip, at its top connected to an axial block integrated with a gear, said shank penetrating through said gear and being pivoted and restricted at gradation between said gear and said axial block with said rotation plate, multiples of axial holes being provided on said rotation plate; said knob being pivoted at the top of an opening end of said containing base of said handle, at least three planet gears being fixed in position at equal spacing on a base of said knob, said planet gears being placed into where between said gear and said meshing gear, each said planet gear with its axis penetrating through an axial hole provided in said rotation plate, a central axial hole containing a rolling ball being provided in the center of said knob to allow the upper end of said shank to penetrate through thus to form a differential gearing mechanism; and said handle when gripped and the tip of the blade pressing against the head of a screw, the upper end of said shank being raised to hold against said rolling ball in the central axial hole of said knob forming a central axis to support pivoting, said planet gears revolving and being placed into said meshing gear to rotate in the opposite direction to that of said knob, thus to drive said gear to rotate in the same direction as that of said knob for said shank to rotate in the same direction in driving the head of said screw.