| 摘要 |
<p>The handle (7) of the drill (1) carries a circular spirit level (9) which makes it possible to ensure that the position of the working axis of the drill is correct. As this spirit level (9) can function satisfactorily only when it is held upwards, the handle (7) is mounted rotatably on its axis and can be locked with the aid of a lock screw (11) which permits modification of the position of the level (9) as a function of the position in which the drill has to work, that is to say having its axis either horizontal, vertical or inclined in an intermediate position. <IMAGE></p> |
