| 摘要 |
<p>The guide element (20) holding the tool (26) is designed as a y-shaped frame. A lever (16, 17) rotating around a vertical axle (23) is attached between each of the outer ends of the arms (21, 22) of the frame (20) and a second vertical axle (18). The first axles (23) are positioned at a smaller distance from each other than the second axles (18), resulting in a diagonal position of the levers (16, 17). While the tool (26) is laterally moved an unrestricted view on the affected area is constantly facilitated.</p> |
