| 摘要 |
<p>The screwdriver comprises at the end of its rod a moving device (1); the rectangular blade is arranged close to the rod (6) and is rotated by a rotation motion of the handle (3). Said device (1) is, preferably, a helicoid pinion gear (1a, 1b) or a conic pinion gear. The mechanism is provided in a casing (7). The screw may be fixed and positioned with a resilient support (5) movable by means of a slider (10), whereupon it may easily be screwed on. Before the screw is screwed on definitely, the support (5) is removed. The rod (6) is introduced through the casing (7) and has at the outer end a four-sided opening to receive a larger blade (2"). Thus, the screwdriver may also be used as an ordinary screwdriver. </p> |
