Manhole assembly with water barrier
OwnerMichael J. Maddeninventor
Life of this patent
Estimating the term…
Abstract
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.
Claims17
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.
A manhole assembly adapted for connection to a fill pipe for an underground storage tank comprising
- a member having an at least generally cylindrical sidewall and a bottom wall defining a chamber in said member,
- an annular cover removably mounted on said member,
- means defining an opening through said bottom wall for receiving a fill pipe assembly therethrough, and
- combined sealing and cushioning means secured to said bottom wall for attaching said member to said fill pipe assembly to seal said chamber and for permitting universal movement of said fill pipe assembly relative to said member, said combined sealing and cushioning means comprising a pair of clamping plates, a pair of elastomeric seals, and fastening means for compressing said clamping plates together, a first one of said elastomeric seals being disposed axially between said clamping plates and a second one of said elastomeric seals being disposed axially between one of said clamping plates and the bottom wall of said member and flange means formed on each said clamping plate for extruding a respective said elastomeric seal radially inwardly in response to tightening of said fastening means.
A manhole assembly adapted for connection to a fill pipe for an underground storage tank comprising
- a unitary and impervious hollow body comprising a body member having a cylindrical sidewall and a bottom wall defining a chamber therein,
- an annular rim secured to an upper end of said sidewall and terminating at an annular upper surface in part defined on an annular mounting flange extending radially outwardly from said body,
- an annular cover removably mounted in overlying relationship on said annular upper surface,
- a plurality of upstanding and circumferentially spaced lugs formed on a radially outer edge of said mounting flange to define an opening between each circumferentially adjacent pair of said lugs, a bottom of each said opening being defined by said upper surface, and
- dam means solely defined circumferentially, continuously and entirely between said upper surface 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 comprising at least one annular barrier flange formed in upstanding relationship on said upper surface and at least one annular groove formed on the underside of said cover and having said barrier flange disposed in nested relationship therein, said groove defining an annular centering flange on said cover disposed in a circumferential centering space defined between said lugs and said barrier flange.
Dependencies are inferred from the claim text.