Drive device for manually driving a blind comprising an epicyclic reduction gearbox

The invention relates to a drive device for manually driving a blind, roller shutter or the like equipped with a winding shaft, comprising an epicyclic reduction gearbox between a manual driving means and the winding shaft of the blind. Drive device for manually driving a blind, roller shutter or the like, comprising an epicyclic reduction gearbox consisting of the juxtaposition of two simple planetary gear trains of type I (A, B, a,/A, B, a), the sun wheels (A, A) of which are mechanically linked so as to be driven simultaneously at the same speed and the annulus gear (B) of the first planetary gear train of which, on the input side of the reduction gearbox, is fixed and the other annulus gear (B) of which can rotate. The reduction ratio is less than or equal to 3. This drive device makes it possible to obtain a low reduction ratio with a small diameter.