| 摘要 |
PROBLEM TO BE SOLVED: To expand a body size to an upper side in response to requirement to secure a large room space inside a body. SOLUTION: This structure is provided with an inner box part 13a, an bottomless outer box part 13b of which the substantial whole is slide-engaged with an outside of tide inner box 13a while surrounding an upper face and a side face of the box 13a, and which is provided to be movable vertically with respect to the inner box 13a, moving means 22 provided respectively corresponding to respective angled parts 25 where fellow side faces in respective side faces of the outer box part 13b cross, and for moving the respective angled parts 25 vertically, interlocking mechanisms interlocked with the respective moving means 22 to move the whole of the outer box part 13b vertically in a substantially horizontal condition, and a driving source for imparting driving force to operate the moving means 22 via the interlocking mechanisms. When the outer box part 13b is moved upward, an inner space comprising the outer box part 13b is expanded in an upper side of the inner box part 13a.
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