| 摘要 |
The invention relates to an overhead door which comprises a leaf (1) and means for controlling the opening and closing, arranged to move the lower edge (12) of the leaf in a vertical closing plane and to move the upper edge (11) of the leaf in a horizontal or oblique opening plane. The control means comprise flexible force-transmission links (2, 3, 4) arranged in a horizontal circuit and a vertical circuit, one being a master circuit and the other a slave circuit, the horizontal circuit being located in the opening plane and connected to the upper edge (11) of the leaf, and the vertical circuit being located in the closing plane and connected to the lower edge of the leaf, a motor means (5) being arranged to drive the travelling of the master circuit, and the two circuits being connected by a transversely movable slide (6), preferably located in an area above the door, wherein the two circuits comprise parallel segments, the slide having link-return elements arranged such that a provoked movement of the one or more links (3, 4) of one of the two circuits causes an asynchronous simultaneous movement of the one or more links (2) of the other circuit by automatically distributing the forces exerted by the links respectively on the upper edge and on the lower edge of the door. |
