| 摘要 |
A closure arrangement for an opening in a building includes a number of closure elements (2, 3). At least one of the closure elements (2, 3) is vertically movable by means of operating arms (18). The operating arms (18) are powered by a driving device, which includes at least one drive motor (10). On either side of the closure arrangement, the driving device includes an upright screw (12) which is mounted in an axial bearing (15). Each screw (12) has a nut (14), and the operating arms (18) have abutment faces (17) which rest on the nuts (14). Couplings (16) couple the abutment faces (17) and the nuts (14) with a play for permitting an angular discrepancy between each abutment face (17) and the longitudinal axis of the respective screw (12) as well as transversal movements thereof. |
