ROLLING AWAY PROTECTIVE FIRE-PROOF DOOR Russian patent published in 1996 - IPC

FIELD: civil engineering. SUBSTANCE: rolling away protective proof door has a leaf made of metal tubes laid one on top of the other with a gap partially or completely filled with metal rods and welded through metal plate or metal angle section installed in the gap with its edge and flush with leaf surface. Metal tube cavities except the upper are pressed with clay packed inside polyethylene. Door leaf is hinged through upper tube to a hinged tube of smaller diameter attached with bolts to cantilever extensions from walls of pre-tambour and having slots in its upper part. Roller bearings are installed in these slots onto axle attached tube upper surface. Rubber seal is laid along contour of door leaf. The seal is fire resistant. Vertical slots are originated in four points of door leaf to install hold-down devices. The devices include stop of angle section, nut with handles and T-shaped threaded rod installed with its shelf into vertical slot of the tube of door leaf, and subsequently turned through 90 . EFFECT: improved protection. 8 dwg