| 摘要 |
<p>The door has a set of transversely running, vertically adjustable door sections (2a, 2b) which are foldably connected with each other and include rollers guided in roller rails. A drive axle (9) is connected with a drive and hauling ropes (10) for raising and lowering the door. A crank arm (14) is provided at the drive axle, and a helical spring is provided at the ropes for longitudinal adjustment of the ropes during inclination of the door sections in a bending area of the roller rails.</p> |
