| 摘要 |
<p>Two parallel positioned short arms (3, 4) are connected with a bridge (5) holding a mechanism (24, 35) for lowering and lifting the spreading wedge (25) comprising a chamfered lower area (29, 30). Each of the arms (3, 4) is provided with a transversal bore (6, 7) for the accommodation of a clamping screw (10, 11) for being moved towards the flaps extending from the two sides of the gap at the sleeve to be widened. A shoulder (33, 34) at the wedge (25) prevents the element from moving too far.</p> |
