Door with a device for improving the opening behaviour of the door, in particular of a sectional overhead door

摘要

The door has a door blade with top and bottom segments, in which each segment has two ends facing opening and closing directions of the blade, respectively. The bottom segment with three rollers shifts its middle roller (16) in the opening direction between its ends, where the middle roller is not adjacent to the end facing the closing direction. The shifted roller is placed in a curved rail section when the blade is opened widely. The curved section is connected to horizontal and vertical sections of the rail. The rollers of each segment slide together in the opening direction of the door.