| 主权项 |
1. A frame for a cover for one of a catch basin and a manhole, the one of a catch basin and the manhole having an inlet, the inlet having an inlet passageway having a first cross-sectional shape, the first cross-sectional shape having an axis of symmetry, the frame comprising:
a hollow body defining a frame passageway therethrough, the hollow body having a second cross-sectional shape, the second cross-sectional shape having a first side and a second side opposite to the first side and the sides are straight and of unequal length, when the frame is installed onto the one of the catch basin and the manhole, the inlet passageway is in communication with the frame passageway, the hollow body has a lower end extending partially within at least one of the inlet passageway and a head portion reducing a surface area of the inlet passageway, as seen from a top, the second cross-sectional shape is inscribed within the first cross-sectional shape, a distance of the first side of the second cross-sectional shape to the axis of symmetry of the first cross-sectional shape is different from distance of the second side of the second cross-sectional shape to the axis of symmetry of the first cross-sectional shape, and wherein the second cross-sectional shape is a truncated circle. |
