| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to easily perform work from any side of disc by providing a hexagon head bolt by attaching it through a spring washer and a flat washer, inserting it though a bolt inserting hole of another box body, coupling holes in both the discs and then screwing through a hexagon nut. SOLUTION: Two box bodies 8 cover coupling holes 2 of respective side plates 1, and each box body comprises a front plate 9 parallel to the side plate 1, both side plates 10 at both the side of the front plate 9 and a bottom plate 11. An opening 12 is formed in the upper surface. A hexagon nut 6 is inserted to a hexagon bolt inserting hole 13 on the front plate 9 in either one of the box bodies 8, and both side surfaces facing the nut 6 are positioned almost parallel to both the side plates 10 of the box body 8, thereby permitting no rotation of the nut within the box body 8. A hexagonal bolt 3 attached with a spring washer 4, and a flat washer 5 is inserted to the inserting hole 13 and both adjacent holes 2 from the side where no nut is inserted, and the bolt 3 is tightened for coupling both the side plates 1. |
