| 主权项 |
1. A water inflow impervious manhole cover assembly comprising:
a molded non-metallic frame comprising an annular peripheral frame wall having an upper end defining an access opening therethrough and a lower face upon which the frame sits, the upper end of the peripheral frame wall defining a cover-receiving seat therein; the seat including a radially inwardly extending lip circumscribing said access opening and having a seating surface with an annular sealing channel formed therein, the sealing channel receiving a gasket therein; an imperforate manhole cover received within the seat of the frame member and having a bottom planar surface which abuts the seating surface of the lip and covers the annular sealing channel; and a fastening mechanism releasably interconnecting the manhole cover to the frame, the fastening mechanism including a number of cams rotatable relative to the frame between a locked position wherein the cams are matingly received within cam cavities formed in the peripheral frame wall such as to fasten the manhole cover to the frame, and an unlocked position wherein the cams are disengaged from the frame such as to permit removal of the manhole cover from the frame to expose said access opening; and wherein an annular watertight seal is formed, between the bottom planar surface of the manhole cover and the seating surface of the frame having said gasket retained within the annular sealing channel, when the cams of the fastening mechanism are disposed in the locked position. |
