| 摘要 |
The side uprights (3) extend over the complete lifting height of the door panel (6) covering the closure and opening position and are joined to one another on the head side and pref. also on the foot side by cross beams (4,5) to form a door frame (2). The lift drive (7) is arranged in the area of the upper cross beam and has a tractive screw spindle (11) running along the side uprights for suspension of the door panel. The lift drive is of the spindle (8) type, to the screw spindle of which the door panel engages via non-rotatable, supported nuts (12). Alternatively, the lift drive can be of the chain type which has a drive shaft (9) located inside the hollow cross beam with chain wheels arranged in the area of the side uprights. |
