| 摘要 |
An access cover assembly (10, figure 1), for example a manhole cover, has a cover member (11) and an outer frame (12), the cover member having an inner frame (18, figure 2) adapted to be filled with, for example, screed or concrete. The cover member is pivotally mounted to the outer frame by means of a two-link double pivot system (figure 10), one end of each link pivotally mounted to a fixed point on the cover member, the other end of each link to a fixed point on the cover member, the links being spaced from each other. Resilient means (13, 14), preferably gas springs, may be provided to assist in raising the cover member. |
