DOOR Russian patent published in 2003 - IPC

FIELD: construction engineering, particularly, designs of doors for industrial and residual buildings. SUBSTANCE: door contains closed metal box with frame welded from longitudinal and transverse tubular blanks with formation of windows in frame four corners, rack closed small frame located in frame after welding at least one lining panel secured in rack small frame through holes made in welded frame. It has additional at least three transverse tubular blanks with racks located in them to form pocket for locking mechanism and made with coating of racks and box with substance possessing adhesive, sealing, sound-heat insulating and fireproof properties. Holes in welded frame are made after welding for strong fastening of lining and for formation of pattern by means of fasteners. EFFECT: higher strength, fireproofness, sealing and heat-sound insulation of door. 7 cl, 2 dwg