초록 ▼

A manhole cover includes a cover panel formed from a first material, which may be a generally lightweight material, and an insert formed within a cutout in the first material. The insert may be formed from a higher strength material and may include one or more openings for receiving conventional cov

A manhole cover includes a cover panel formed from a first material, which may be a generally lightweight material, and an insert formed within a cutout in the first material. The insert may be formed from a higher strength material and may include one or more openings for receiving conventional cover removal tools. In one embodiment, the manhole cover includes a cover panel having a peripheral edge and defining a diameter, and further defining an opening or cutout that is spaced from the peripheral edge. The insert is disposed in the opening. The insert may include an upper surface and a lower surface opposite the upper surface, the insert defining first and second openings in the upper surface, with the first opening shaped to receive a first removal tool and the second opening shaped to receive a second removal tool.

대표청구항 ▼

1. A manhole cover comprising: a cover panel formed from a first material, said cover panel having a peripheral edge and defining a diameter, said cover panel defining an opening spaced from said peripheral edge; andan insert disposed in said opening, said insert formed from a second material differ

1. A manhole cover comprising: a cover panel formed from a first material, said cover panel having a peripheral edge and defining a diameter, said cover panel defining an opening spaced from said peripheral edge; andan insert disposed in said opening, said insert formed from a second material different from said first material, said insert including an upper surface and a lower surface opposite said upper surface, said insert defining first and second openings in said upper surface, said first opening shaped to receive a first removal tool and said second opening shaped to receive a second removal tool, wherein said first opening is key-hole shaped to receive a key-style cover removal tool, and said second opening is shaped to receive a j-hook style cover removal tool, wherein said second opening includes a depth that gradually decreases approaching an edge of said second opening, wherein said insert defines a drainage hole in said lower surface said drainage hole generally aligned with said first opening. 2. The manhole cover of claim 1 wherein said first and second openings are aligned along said diameter. 3. The manhole cover of claim 1 wherein said first material is a reinforced polymer composite. 4. The manhole cover of claim 3 wherein said first material is a polymer reinforced with glass fibers. 5. The manhole cover of claim 4 wherein said second material is formed from stainless steel. 6. A manhole cover assembly comprising: a manhole frame defining an access opening;an injection molded composite cover sized to cover said access opening to prevent contaminants from entering said access opening, said cover molded to define an insert opening; anda steel insert disposed in said insert opening, said insert including an upper surface and a lower surface opposite said upper surface, said upper surface defining a keyhole shaped opening for receiving a keyhole style cover removal tool, said upper surface defining a j-hook opening for receiving a j-hook style cover removal tool, wherein said j-hook opening includes a first side and a second side, said j-hook opening having a gradually increasing depth extending away from said first side, wherein said cover includes a peripheral edge, and said first side is farther from said peripheral edge than said second side, wherein said keyhole shaped opening and said j-hook opening are aligned along a diameter of said cover, wherein said keyhole shaped opening is closer to said peripheral edge than said j-hook opening, wherein a drainage hole is defined in said lower surface of said insert to allow contents to pass through said insert, wherein said drainage hole is positioned underneath said keyhole shaped opening. 7. A manhole cover comprising: a cover panel having a peripheral edge, an upper surface, a lower surface and a depth defined between said upper and lower surfaces, said cover panel defining a cutout extending into said upper surface and through a substantial portion of said depth of said cover panel, said cutout spaced from said peripheral edge; andan insert disposed in said cutout such that said insert is exposed on said upper surface of said cover panel, said insert formed from a different material than said cover panel, said insert including an upper wall and a lower wall, said upper wall defining a keyhole opening and a j-hook opening, said keyhole opening having a keyhole shape to receive a keyhole style cover removal tool, said insert defining a depth between said upper and lower walls, said lower wall being curved underneath said j-hook opening to gradually decrease said depth of said insert for receiving a j-hook style cover removal tool, wherein a drainage hole is defined in said lower surface of said insert to allow contents to pass through said insert, said drainage hole positioned underneath said keyhole shaped opening. 8. The manhole cover of claim 7 wherein said upper wall of said insert includes a lower surface spaced from said lower wall of said insert and facing said lower wall of said insert, said lower surface of said upper wall and said curved portion of said lower wall being aligned with each other to receive a j-hook style cover removal tool therebetween. 9. The manhole cover of claim 8 wherein said keyhole opening and said j-hook opening are aligned along a diameter of said cover panel, said keyhole opening positioned closer to said peripheral edge than said j-hook opening. 10. The manhole cover of claim 9 wherein said cover panel is formed from a reinforced polymer composite material and said insert is formed from a stainless steel material.