PURPOSE:To enable a natural lighting body to be easily assembled by providing the upper surface of a bottom plate to support the lower end of a muntin with an upper cross rail positioning section for placing the lower end of an upper cross rail, and a lower cross rail positioning section for placing the lower end of a lower cross rail. CONSTITUTION:Douser support rails 9 are slantingly connected to muntins 6, and a douser 10 is coupled along the internal sides of an upper cross rail 7 mounted on the side of a building, a lower cross rail 8 mounted on the side of an eaves and a support rail 9, thereby constituting a natural lighting body. Then, a natural lighting body assembly jig 39 is prepared. Thereafter, the right and left muntins 6 are placed in parallel to each other on the bottom plate 40 of the jig 39 in such a way as superposed on the internal surfaces of side walls 41, and an inner frame body 20 is inserted so that the support rails 9 are superposed on the inner surfaces of the muntins 6. Then, when the cross rail 7 is placed on an upper cross rail positioning section 44, and the cross rail 8 on a lower cross rail positioning section 50 respectively, the support rails 9 can be automatically coupled slantingly to the muntins 6, independent of the length of the natural lighting body 3, with a distance from the lower end of the muntins 6 to the cross rails 7 and 8 always kept constant. As a result, the natural lighting body 3 can be easily assembled.
展开▼
