| 摘要 |
PROBLEM TO BE SOLVED: To reinforce a lower plate without hindering detachment and attachment of the lower plate. SOLUTION: When a lower plate supporting frame 19 having a lower plate 16 is mounted to a supporting frame mounting portion 120, pressing members 121 to 126 press three positions of the upper side and the lower side of the periphery of the lower plate 16 from the reverse side. Therefore, even if struck or pushed from the surface side, the lower plate 16 does not easily get warped or broken since the lower plate 16 is reinforced with the periphery pressed by the pressing members 121 to 126. Since the lower plate 16 is attached to or detached from the lower plate supporting frame 19 with the lower plate supporting frame 19 removed from the supporting frame mounting portion 120 of the front door 12, the pressing members 121 to 126 provided in the front door 12 do not interfere with the attachment and detachment.
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