| 摘要 |
<p>A cover (1 ) for closing the service opening (2) of a pit casing (3), the cover (1 ) including an opening (4) with a hatch (5) and a first member (6) coupled to the cover (1 ) that is accessible though the opening (4) in the cover (1 ) when the hatch (5) is not in a closed position, wherein when the cover (1 ) is in a closed position to close the service opening (2) the first member (6) is in cooperative proximity with a second member (7) coupled to the pit casing (3) that at most protrudes only a portion of the span of the service opening (2), and when the cover (1 ) is in the closed position and the hatch (5) on the cover (1 ) is opened from its closed position the first and second members (6), (7) may be coupled together to resist the cover (1 ) from being moved to open the service opening (2).</p> |
