AIR-TIGHT DOOR ASSEMBLY Russian patent published in 2006 - IPC E06B5/10 

FIELD: building units, particularly doors to be installed in shelters and other defensive structures.

SUBSTANCE: air-tight door assembly comprises frame, door leaf with sealing member fastened to the door leaf, hinges and locking device. Door leaf comprises inner and outer webs rigidly connected with each other by means of bridges, as well as movable web arranged between inner and outer ones and attached to pressure frame through bridges. Pressure frame is installed on inner web and cooperates with sealing means located on inner web so that sealing member abuts rim extending along inner web perimeter. Door assembly also comprises locking means having at least two rows of vacuum springing chambers arranged between extreme and movable webs and formed in outer web wall. The springing chambers are brought into contact with movable web.

EFFECT: increased reliability of door sealing and possibility to perform remote control of door opening and closing, as well as to control air-tightness of space between door frame and door leaf.

5 cl, 2 dwg