Fluid handling – With casing – support – protector or static constructional... – Static constructional installations
Reexamination Certificate
1999-04-28
2001-10-23
Rivell, John (Department: 3753)
Fluid handling
With casing, support, protector or static constructional...
Static constructional installations
C137S565170
Reexamination Certificate
active
06305410
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a sewage ejector basin for receiving and distributing sewage via a pump housed in the basin. Additionally, the invention provides a sewage ejector assembly including the basin, a top cover for the basin, and the pump housed in the basin for pumping sewage received in the basin through an outlet in the assembly.
BACKGROUND OF THE INVENTION
Generally, sewage may be distributed from a sewage source to a desired location by gravity flow or by pumping. For example, for residential sewage, all sources of sewage in the residence may be located higher than the public sewer or septic tank connection, and the sewage may be transported to the connection solely by gravity flow. However, if a sewage source is located at a lower elevation than the sewer line connection, it becomes necessary to pump sewage to the connection. One example is a bathroom installation in a basement where the sewer line connection is located higher than the toilet.
Sewage ejector assemblies may be installed to distribute sewage from a source to the desired sewer line connection. These assemblies typically include a container having an inlet, where sewage is received from the sewage source, and a pump for pumping received sewage to an outlet of the container, the outlet for connection to a sewer line leading to the public sewer or septic tank. For example, Liberty Pumps (Bergen, N.Y. USA) markets pre-assembled sewage ejectors under the trade name “370-Series” that comprise a polyethylene basin with an inlet nub (referred to in the industry as a “hub”) adapted to be connected to a sewage source, a cover for the top of the basin, a pump mounted in the basin, and an outlet pipe extending from the pump to outside the cover. Such basins are rotationally molded in a two-part mold having a part-line parallel to the basin bottom that dissects the body inlet nub. The various components also may be sold individually for custom assembly at a job site. The basin may be installed immediately beneath the foundation, for example, such that the top of the basin is flush with the foundation slab, or located underground beyond the foundation and backfilled with soil. In either case, the inlet to the ejector system is in connection with the sewage source, and the outlet is in connection with a line running to the public sewer, a septic tank or alternate sewage treatment device.
SUMMARY OF THE INVENTION
This invention provides an improved fluid ejector assembly and basin therefor.
According to certain embodiments of the invention, there is provided a basin for receiving sewage and housing a pump therein, comprising: a basin body comprising a generally cylindrical wall including an inner wall surface and an outer wall surface, and a closed bottom at a bottom portion of the cylindrical wall, the cylindrical wall terminating at a top portion of the basin body to define an open top; and an annular collar projecting from the outer wall surface at a bottom portion thereof, wherein the basin body and annular collar are integrally molded from a resin. The annular collar inhibits flotation of the basin, for example, where the basin is installed in a hole subject to rising groundwater. This annular collar may project from the outer wall surface adjacent the closed bottom.
According to other embodiments, this invention relates to a basin for a sewage ejector system that comprises the basin body having diametrically opposed recesses formed in the outer wall surface near a top portion thereof. The recesses facilitate handling of the basin during transport and installation.
The invention also relates to a sewage ejector assembly comprising the basin for receiving sewage comprising a basin body, the basin body comprising a generally cylindrical wall including an inner wall surface and an outer wall surface, integral annular ribs projecting from the outer wall surface, and an integral closed bottom at a bottom portion of the cylindrical wall, where the cylindrical wall terminates at a top portion of the basin body to define an open top, a top portion of the generally cylindrical wall including a flat annular region. The assembly also comprises a top cover for covering the open top of the basin, an outer lower edge surface of the top cover being sealingly engageable with the flat annular region of the basin, the basin body further comprising a raised annular edge circumferentially surrounding the flat annular region and outer edges of the top cover when engaged with the basin body. The raised annular edge and the basin body may be integrally molded from a resin. The raised annular edge may have an outer surface with a diameter corresponding to a diameter of the outer wall surface at the top portion of the basin body, and an inner surface with a diameter greater than an outer diameter of the top cover. This raised annular edge has a height sufficient to inhibit mortar or concrete applied about the basin during installation from interfering with the seal between the basin and top cover. Preferably, the raised annular edge has a height at least one-half the thickness of the top cover.
According to other embodiments, the inlet opening of the basin may be formed in a nub projecting from the outer wall surface of the basin body, the inlet for connection to a sewage source line. An outlet opening may be formed in the top cover, through which a pipe extends, one end of pipe connected to pump in the basin interior and the other end adapted for connection to a conduit running to the sewer line.
REFERENCES:
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patent: 4245664 (1981-01-01), Johnson
patent: 4344543 (1982-08-01), Hoffman
patent: 4709723 (1987-12-01), Sidaway et al.
patent: 4822213 (1989-04-01), Grace et al.
patent: 5441632 (1995-08-01), Charon
patent: 5553794 (1996-09-01), Oliver et al.
patent: 5562254 (1996-10-01), Sleasman et al.
patent: 6059208 (2000-05-01), Struthers
Cook Charles E.
Waldron Randall D.
Harter Secrest & Emery LLP
Liberty Pumps
Rivell John
Salai Esq. Stephen B.
Shaw Esq. Brian B.
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