| 摘要 |
A cover is constructed of a pair of semi-cylindrical parts 36L, 36R combined with each other with a hinge (shielding means). A drainage port is formed on a lower surface of the cover. The hinge is so provided that an interior of the cover is prevented from being seen from outside through the drainage port. Even though water is linearly splashed at a high pressure on the drainage port 47 from the outside of the cover, the water collides with the hinge. Thus, the water does not reach the drainage port directly. Even though the water penetrates into the cover, it is reflected on the inner surface of the hinge and thus the force of the water is reduced. Accordingly, the water does not penetrate into the cover at a high pressure. |
