초록 ▼

A manhole assembly is attached on a fill pipe for an underground storage tank for gasoline, diesel fuel or other types of toxic chemicals. The manhole assembly comprises a bucket-like body attached on an upper end of the fill pipe and a removable cover mounted on an upper end of the body to selectiv

A manhole assembly is attached on a fill pipe for an underground storage tank for gasoline, diesel fuel or other types of toxic chemicals. The manhole assembly comprises a bucket-like body attached on an upper end of the fill pipe and a removable cover mounted on an upper end of the body to selectively expose the fill pipe. At least one annular dam is formed on an upper surface of the body and is adapted to nest within an annular groove formed on an underside of the cover. The dam functions as a barrier to prevent the ingress of water into the body during rainstorms and the like. A combined sealing and cushioning assembly attaches a bottom wall of the body to the fill pipe and a drain connection is provided for selectively communicating an internal chamber of the body with the fill pipe.

대표청구항 ▼

A manhole assembly adapted for connection to a fill pipe for an underground storage tank comprising a unitary and impervious hollow body defining a chamber therein and terminating at an annular upper surface extending at least generally horizontally from an interior edge to an exterior edge thereof,

A manhole assembly adapted for connection to a fill pipe for an underground storage tank comprising a unitary and impervious hollow body defining a chamber therein and terminating at an annular upper surface extending at least generally horizontally from an interior edge to an exterior edge thereof, an annular cover removably mounted in abutted relationship solely on the upper surface of said body and covering said chamber, and dam means solely defined circumferentially, continuously and entirely between the upper surface of said body and an underside of said cover for forming a barrier for preventing the ingress of liquid radially inwardly over said surface and into said chamber, said dam means disposed between the interior and exterior edges of said surface and vertically thereabove and comprising at least one annular barrier flange formed in upstanding relationship on said upper surface and an annular groove formed on the underside of said cover and having said barrier flange disposed in nested relationship therein.