| 摘要 |
PROBLEM TO BE SOLVED: To provide the structure of an inexpensive door of which frame is not required to be manufactured by welding. SOLUTION: A connection member 3 is inserted in a U-shaped section part of a vertical frame 21 in the vicinity of a corner while projecting the front end by the length of the flange of a lateral frame 22, and the vertical frame 21 is connected to the connection member 3 by screws 6 inserted from the web of the vertical frame 21 into both side walls 51, 51 of the connection member 3 and then, the connection member 3 projecting from the vertical frame 21 is inserted in the U-shaped section part of the lateral frame 22, and the lateral frame 22 is connected to the connection member 3 by the screws 6 inserted from the web of the lateral frame 22 in the extended walls 53, 53 of the connection member 3, to form a frame structure.
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