PORTABLE DRILLING MACHINE

A portable drilling machine comprising, a first driving means being movable along a first longitudinal axis, said first driving means being configured to be connected in a solidary manner to a drill bit along the first longitudinal axis, a second driving means arranged in a second longitudinal axis, wherein the first longitudinal axis and the second longitudinal axis are parallel to each other, a worm gear connected in a solidary manner to the second driving means along the second longitudinal axis, an adapter mechanically connected to the worm gear, said adapter comprising a sleeve mechanically connected to the first driving means, wherein the adapter is configured to transfer a movement of the worm gear in a first longitudinally movement along the second longitudinal axis and to transfer said first longitudinally movement along the second longitudinal axis in a second longitudinally movement along the first longitudinal axis moving the first driving means.