| 摘要 |
A door assembly comprises two doors (1, 2) coupled to carriages (3, 4) which run on a track (6) and which are coupled to respective runs of an endless belt (12). The doors are moved towards and away from one another by driving the endless band. To this end a drive wheel (23 or 21) engaged with the endless band is driven by a prime mover (29) via a simple band and sprocket wheel drive arrangement (31/28). <IMAGE> |
