| 摘要 |
<p>A cover for a road system device provided with a frame comprises: a blocking member and a base body defining a covering surface for the road system device, extending in a cover plane, and having a housing for receiving the blocking member wherein the housing and the blocking member are adapted for blocking the cover relative to the frame or to a neighboring cover, and the housing is adapted to maintain the blocking member relative to the base body autonomously and to oppose a movement of the blocking member in a direction extending perpendicular to the cover plane and tending to move the blocking member away from the covering surface, said road system device being applicable to access manholes for underground installations.</p> |
