| 摘要 |
PROBLEM TO BE SOLVED: To ensure the fire protection performance of a door which has its surface material formed of a plurality of plates. SOLUTION: In connection of the plates together, a fitting groove A is formed by folding at a distal end of a rise portion 800 of one of folded pieces 80, while a fitting projection B is formed by folding at a distal end of a rise portion 900 of the other folded piece 90. By fitting the fitting projection B into the fitting groove A in a depth direction, the fitting groove A and the fitting projection B are kept in a fitting state while both the rise portions 800, 900 are abutted on each other, and then the fitting state between the fitting groove A and the fitting projection B is fixed by a fixing means. Preferably the fixing means is obtained by folding a folding engaging piece B' which is formed by cutting away the folded piece 90 with the fitting projection B, and engaging the folding engaging piece B' with a rise portion 800A obtained by cutting away a distal end of the folded piece 80 with the fitting groove portion A. COPYRIGHT: (C)2008,JPO&INPIT
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