| 摘要 |
PROBLEM TO BE SOLVED: To improve strength of a resin part with which a stone or other equipment is liable to collide. SOLUTION: A coupling device comprises a rod part 1 made of resin of elongate plate shape, cylindrical parts 2 made of resin and integrally formed with the rod part at least at one end of the rod 1, and coupling parts 3 arranged in the cylindrical parts 2 and coupled to other equipment or the like. A rib 5 is provided at a periphery as a contour of the rod 1, and a groove 7 indented in a axial direction is formed at least at a part of the rib 5 so as to constitute double structure of an outer rib 5A and an inner rib 5B. |
