| 摘要 |
A coupling device is disclosed which comprises an elongated plate-shaped synthetic resin-made rod body, a synthetic resin-made cylindrical portion formed integrally at at least one end of the rod body, and a joint piece provided inside the cylindrical portion and which is to be coupled to a mating object; the rod body consisting of a plate member ribbed orthogonally, and along each longitudinal perimeter, thereof; each rib being recessed in an opposite direction to the projecting direction thereof and along at least a portion of the length thereof to provide a pair of outer and inner ribs which form together a double structure.
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