| 摘要 |
<p>The unit has safety bolts (3) arranged displaceably relative to each other and an interlocking bolt interacting with a grasper (4). The safety bolts and an extension of the grasper constructed as a piston rod are arranged in a lower housing part (1) vertically displaceable in relation to each other. A piston for the piston rod of the grasper is located in an upper housing part (2) placed on the lower housing part. The safety bolts move inward and outward relative to each other by another piston rod (3a) guided in the safety bolts.</p> |
