FIRE DOOR ASSEMBLY Russian patent published in 2007 - IPC E06B5/16 

FIELD: building, particularly devices to protect wall openings in industrial and residential building structures against free flame.

SUBSTANCE: fire door assembly comprises door leaf and door frame. Fire-resistant screen is installed over door frame and is located from the first door frame side. Fire-resistant screen is retained in upper position with fixer. The fire-resistant screen is made as a number of pivotally connected fire-resistant plates, which are retained in collapsed upper position with heat-sensitive fixer so that accordion-like structure is created. Fire-resistant plates include metal substrates and hear-reflective surfaces located from outer fire-resistant screen side. The fire-resistant plates are covered with heat-insulation layer from inner sides thereof.

EFFECT: increased fire-resistance.

4 dwg