| 摘要 |
<p>The frame (10) has front curved tube sections (13, 14) aligned at an acute angle to each other when viewed in a motion direction. Front roller units are arranged at ends of the tube sections. A fastening region (18) is extended towards the roller units for connection with a grating cage. The roller units are arranged laterally near to the tube sections. A receiving element (21, 22) is provided at the tube sections and the roller units are rotatably supported at the receiving element. The tube sections are connected with each other by cross bar elements (19, 23).</p> |
