| 摘要 |
<p>The device for the covering of an elongated hole penetrated by a rod has a cover cap (10) movable by the rod and formed by two circular, rotatably mounted discs (18,20) which at least partially overlap in plan view. The cover discs each have an elongated hole (22,24) penetrated by the rod and movable at an angle to the elongated hole (8) along which the rod is movable. During adjustment of the rod in the elongated hole (8) one of the longitudinal sides of the elongated holes in the cover discs is acted upon by the rod to exert a turning moment on the cover discs so that they are twisted in opposite directions.</p> |
