| 摘要 |
<p>The overhead door structure comprises flat oblong horizontal panels hinging together at their edges, also slides or rollers on opposite sides and at intervals. These work in rails at the sides of the doorway, extending vertically and joined by curved sections to top ones running horizontally and rearward. A second guide rail (17) is mounted close and parallel to the first (16) and in front of it, and extends vertically above the curved section (19) for a set distance (21). The guide roller (12) at the door bottom edge works in the second rail, and the other rollers (13, 14, 14A) in the first one.</p> |
