| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lid device with a high rain water-inflow performance and an anti-slip function. <P>SOLUTION: The lid device comprises a lid member 2 including a top plate 2a exposed to a road surface and a peripheral frame 2d, a plurality of first ridge-like portions 3 having an outer edge 3a on the periphery of the top plate 2a, a second ridge-like portion 4 provided in the center area of the top plate 2a and connecting the first ridge-like portions 3 adjacent thereto, a plurality of elongated water inflow ports 10 made over the whole area of the top plate 2a and respectively serving as a through hole penetrating the top plate 2a, a plurality of first projections 11 provided to stand on the top plate 2a and a plurality of second projections 12 provided to stand in the first and second ridge-like portions 3 and 4 and on the inner surface 8 of the peripheral frame 2d. <P>COPYRIGHT: (C)2012,JPO&INPIT |
