Automatisk skydedør med mindst en fløj

摘要

The door with at least one wing (1) is coupled to an endless belt (17) and a motor. There is an auxiliary drive used for abnormal operation, such as when there is a drop in the supply voltage, to open the door automatically. The doors are held by legs (15) onto trolleys (3) which are coupled to top or bottom sides (17',17'') of the belt. There is an idle trolley with a magnetic coupling between this and a working trolley. The auxiliary drive is a gas spring or elastomeric energy storage unit tensioned by the free trolley. For abnormal operation, the coupling is opened automatically and the stored energy opens one door wing.