COMPOSITE DOOR-FRAME, SIDE AND UPPER FRAMEWORKS Russian patent published in 2003 - IPC

FIELD: construction industry, design of doors. SUBSTANCE: set of door-frame has two compressed side frameworks and compressed upper framework produced from composite material. Side frameworks and upper framework are fabricated with formation of first and second longitudinal adjoining open trough sections possessing side walls placed at some distance one from another and common central wall. Edge of wall lies in same plane as edges of side frameworks and upper framework. Section are closed on butts. Bottoms of second sections protrude beyond bottoms of first sections and pass in parallel to them so that connection of upper framework with side frameworks bottoms of first sections limit door-frame. Bottoms of first sections of side frameworks are tailored for installation of door fittings. Bottoms of second sections protrude inwards of door aperture. First and second sections are positioned with formation of thrust shoulder. Side framework made of composite material by compression with formation of first and second longitudinal trough sections having side walls placed at some distance one from another and common central wall. Upper framework of door-frame is made of composite material by compression with formation of first and second longitudinal parallel adjoining open trough sections possessing side walls placed at some distance one from another and common central wall. Edge of wall lies in same plane with edges of mentioned side walls. Sections are closed on butts. Bottom of second section protrudes beyond bottom of first section and passes in parallel to it. First and second section s form thrust shoulder. EFFECT: raised strength and service life of door-frames. 28 cl, 24 dwg