Patent ID: 7048029

Claim:
A sectional door having a) a door frame; b) a door panel comprising a plurality of sections coupled to one another in articulated manner; c) a weight equalization device coupled to said door panel; d) an electrical door drive coupled to said door panel for opening and closing movements of the door panel wherein said door drive comprises at least one impeller; e) a plurality of running rails, f) a plurality of guide rails coupled to said frame, g) a spring-loaded tensioning device coupled to at least one of said two power take off shafts, said spring-loaded tensioning device having at least one pressure roller supported on a surface of said plurality of guide rails, wherein said spring loaded tensioning device presses said at least one impeller against a surface of said guide rail; h) a tensioning spring, wherein said tensioning device comprises two pivot arms mounted to rotate about said power take-off shaft, and which is connected by means of said tension spring, wherein said pressure roller is arranged on said pivot arms, in each instance; wherein said plurality of sections include an uppermost section, which in the closed position of the door panel, is guided on said plurality of running rails as a header section, wherein said plurality of running rails extend essentially horizontally up to said door frame, and have a vertical end segment on a frame side, and wherein any other sections of said door panel that follow below said header section are guided in said plurality of guide rails that have a vertical segment along said door frame, a horizontal segment parallel to said running rail that holds said header section, as well as an arc that joins two of said segments, wherein said door drive is attached to at least one of said sections connected below said header section, and has at least one power take-off shaft mounted on said at least one section, with said impeller at the end of said power take-off shaft, and wherein said driven impeller moves said door panel along said guide rails.