US 5,123,776 AGranted

Plastic fillable manhole cover with penetrating handles

AssigneeAdvanced Drainage Systems, Inc.

InventorsTimothy J. Lang, Mark Stuhlreyer, Eli Blumenau

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Abstract

A manhole cover comprises a top having a top surface and an edge portion, a depending portion having a sidewall and a bottom surface, and an interior chamber. The manhole cover is fabricated from a first material, while the interior chamber is at least partially filled with a second material. The manhole cover preferably includes recessed handles which are recessed into the top and extend downwardly through the bottom surface. Cooperative engagement means in the form of inter-fitting indentations and protuberances are provided in the top surface and the bottom surface respectively. The bottom surface includes a first surface portion which includes a peripheral edge portion and a bracing portion. The bracing portion includes a plurality of brace members each of which have a lower brace surface and a brace sidewall.

Claims11

Dependent claims

A manhole cover for use with a manhole, said manhole cover comprising

a top planar portion,
an outer sidewall having an outwardly facing exterior surface depending downwardly from the periphery of said top planar portion,
a centrally disposed depending portion located inwardly of said outer sidewall, said centrally disposed depending portion having a sidewall and a bottom surface, said bottom surface having a first section being approximately parallel to said top planar portion, said bottom surface also having a second section disposed inwardly of said depending portion sidewall, said second section sloped relative to said top planar portion and said first section, and
an interior chamber located below said top planar portion and above said centrally disposed depending portion, said manhole cover fabricated from a first material and said interior chamber at least partially filled with a second material.

1 more element

Dependencies are inferred from the claim text.