FIRE DOOR Russian patent published in 2008 - IPC E06B5/16 

FIELD: construction and fire-fighting, particularly transparent fire doors for railroad cars adapted to prevent fire and combustion product spread from service compartment into passenger compartment.

SUBSTANCE: fire door comprises door leaf with members arranged therein and door case enclosing the door leaf. Door leaf frame and door leaf are made of profiles having cross-sections composed of different chambers connected with each other. The chambers have closed outlines and are arranged in cascade order. Outer chambers having mating surfaces are connected with each other through central chamber generators. Each central chamber generator has through slot row including slots extending along corresponding profile length and distributed along profile length so that corresponding partitions are created. Corresponding embedded members for threadedly door leaf member fastening are installed in central chambers of door leaf frame profile. Orifices for corresponding threaded connection passage are made as through slots of adjacent chamber generators.

EFFECT: elimination of non-authorized removable door structure member stripping during fire door operation and prevention of air-tightness failure in area of door leaf connection with door case as fire door is exposed to fire.

16 cl, 10 dwg