| 摘要 |
Upper support portions 4 are respectively provided at respective upper end sections of a pair of support columns 1, 1 ' such that the position of the upper support portions can be adjusted in an up-down direction. Lower support portions 5 are respectively provided at respective lower end sections of a pair of support columns 1, 1 ' such that the position of the lower support portions can be adjusted in an up-down direction. A pair of wires 13, 13 is provided to extend between the lower support portion 5 and the upper support portion 4 of the support column 1 . Another pair of wires 13, 13 is provided to extend between the lower support portion 5 and the upper support portion 4 of the support column 1'.
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