| 摘要 |
PROBLEM TO BE SOLVED: To make assembly easier by reducing the number of fixing places by fasteners. SOLUTION: An upper frame block 3 is formed by fixing a plate-shaped upper core member 2 along the bottom surface of an upper frame 1. A plate-shaped lower core member 5 is fixed along the upper surface of a lower frame 4 and a lower block 6 is formed. A plate-shaped vertical core member 8 is fixed to a portion except both upper and lower end portions of each inner surface of both the right and left vertical frames 7, an inner vertical frame 10 is adhered along the inner surface of the vertical core member 8, and right and left vertical frame blocks 9 are formed. Both the end portions of the upper block 3 and lower block 6 are fitted to a portion where the vertical core member 8 of both the upper and lower end portions of the inner surface of both the vertical frame blocks 9 is not provided, and both the vertical frame 7, upper frame 1 and lower frame 4 are fixed with a fixing tool, and the vertical core member 8, upper core member 2 and lower core member 5 are fixed with the fixing device thereby forming the main body of the door frame. The upper core member 2, lower core member 5 and vertical core member 8 are formed with a material having both the rigidity and weight smaller than those of the upper frame 1, lower frame 4, vertical frame 7 and inner vertical frame 10.
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