| 摘要 |
PROBLEM TO BE SOLVED: To mount a back supporting plate without adhering with paste. SOLUTION: The back supporting fixed structure is formed by folding and standing a folding stand plate 3 from a back standing portion 2 of a back extending area of a bottom plate 1, engaging a protruding piece 4 formed by projecting an upper part of the front surface edge of the plate 3 with an engaging hole 6 punched at a lower portion of a back plate 5 to fix the folding and standing state of the plate 3. The plate 3 operates as a supporting plate, and simultaneously prevents folding of the portion 2.
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