Door unit used for insulator has first safety device allowing door to be opened when flange of container is sealingly and firmly connected with insulator frame

摘要

Door unit has a first safety device (140) that allows the door to be opened when a flange of a container is sealingly and firmly connected with the insulator frame; and a second safety device that allows the container flange to be removed from the insulator frame only if the door is sealingly and firmly connected with the insulator frame. The first safety device has a locking unit and a locking mechanism containing a hook (117) interacting with a locking pin (116) and connected to a lever (114) and a tappet (112) inserted into the passage of a bayonet closure of the container flange and acting on the lever. Preferred Features: The lever rotates about an axis (115). The tappet and a support element pre-tensioned by a spring (120) are arranged in the region of opposing ends of the lever.