| 摘要 |
PROBLEM TO BE SOLVED: To simplify structure, and to facilitate linking work. SOLUTION: Potbellied holes 9a, 10a in the same shape are formed at corresponding positions of sidewalls of adjoining panels 9, 10. The potbellied holes 9a, 10a are composed of round hole portions 9b, 10b and long hole portions 9c, 10c which are continuous with these hole portions. Each round portion 9b, 10b has a size which enables insertion of the head portion 7a of a bolt 7, and each long portion 9c, 10c is shaped, so that the shaft portion 7b of the bolt 7 fits in. The head portions 7a of bolts 7 are inserted into the round portions 9b, 10b, and the shaft portions 7b of the bolts 7 are fitted in the long portions 9c, 10c to be set incapable of rotation, and nuts 8 are tightened. |
