DOOR LEAF Russian patent published in 1996 - IPC

FIELD: civil engineering. SUBSTANCE: door lief has horizontal channels of internal and external layers attached along perimeter through coupling damps. Cavity between the layers is filled with spoil and void-generator packed with polyethylene. Coupling damp is made of tube sections with channel sections attached on its two sides. All members of the door leaf are bolted. A tray is installed on lower channels. EFFECT: improved protection against impacts, ionization radiation, and high temperatures. 3 dwg