FIELD: construction of living and service rooms. SUBSTANCE: door consists of thin metal frame of box with post of metal angle, door frame of metal angle with metal sheet welded to it and door panel. Three strips of metal sheets and one metal angle post with hinges welded to it form walls of box metal frame. Box metal frame is introduced into door opening and welded through frame holes to metal rods connected in opening wall. Introduction of box frame into door opening contributes to its strength, guarantees impossibility of pushing of blocks from opening, ensures strong suspension of heavy door to post of metal angle, makes it possible to adjust door to box metal frame in shop but not in opening. The door proper consists of frame fabricated of metal angle with metal sheet welded to frame and door panel introduced into recess between metal sheet and frame. Strength of door is ensured by all its components: frame of metal angle, metal sheet welded to frame and door panel. To provide for tight closing, imparted to door section is trapezoidal shape. It follows from the rectangle along door width that the clearance in door line should be equal to difference between hypotenuse and large side. Door section should be of trapezium shape in which its upper side will be equal to difference between hypotenuse and large side. Door section should be of trapezium shape in which its upper side will be equal to door width and lower side will be equal to hypotenuse of door rectangle section with correction for segment rise with radius equalling the hypotenuse. EFFECT: higher efficiency. 13 dwg
