Sump cover

Claim 2

A cover for a sump assembly including a riser section of generally tubular configuration comprising: a top section; a skirt section depending from the outer periphery of said top section; means defining a pair of side by side circumferentially extending inner and outer channels in said skirt section which open in opposite axial directions, said outer channel engagable over a seal mounted on an outer axial end of said riser; a compression ring engagable in said inner channel having a cross section generally conforming to said inner channel and of a larger width than the width of said inner channel to provide a press fit therein and produce radially directed sealing forces between the cover and riser section, said compression ring having radially directed inner and outer lips which overly a portion of said top section and a base portion of the outer channel.

Claim 3

A cover as claimed in claim 1, wherein said skirt section is of undulating generally S-shaped cross section which defines an inner upwardly open channel of generally U-shaped cross-section and an outer downwardly open channel of generally U-shaped cross-section.

Claim 4

A cover as claimed in claim 1 wherein said top section comprises a disk-like central portion and a downwardly diverging frusto conical annular portion between said central disk portion and said skirt section.

Claim 5

A cover as claimed in claim 3 further including air permeable, liquid impervious means in said central disk to relieve pressure and avoid formation of a vacuum in the sump chamber.

Claim 6

In a sump assembly; a riser section of generally tubular configuration having an upstanding annular rim at one end defining an opening; a cover for sealing the opening in the riser comprising a top section; a skirt section depending from the outer periphery of said top section; said skirt section being of a configuration defining at least one channel; a seal mounted over the annular rim of the riser having a portion extending exteriorly of the rim and a portion extending interiorly of the rim; and said seal having a beveled pilot portion of a cross sectional dimension less than the width of said at least one channel and a body portion of a cross sectional dimension greater than the width of said at least one channel whereby the walls defining said at least one channel exert internal and external radial pressure on said seal portions extending interiorly and exteriorly, respectively, and thereby provide a substantially uniform sealing pressure about the periphery of the cover.

Claim 7

In a sump assembly; a riser section of generally tubular configuration having an upstanding annular rim at one end defining an opening; a cover for sealing the opening in the riser comprising a top section; a skirt section depending from the outer periphery of said top section; said skirt section being of a configuration defining at least one channel; a seal mounted over the annular rim of the riser having a portion extending exteriorly of the rim and a portion extending interiorly of the rim; and said seal having a beveled pilot portion of a cross sectional dimension less than the width of said at least one channel and a body portion of a cross sectional dimension greater than the width of said at least one channel whereby the walls defining said at least one channel exert internal and external radial pressure on said seal portions extending interiorly and exteriorly, respectively, and thereby provide a substantially uniform sealing pressure about the periphery of the cover.

Claim 8

A cover as claimed in claim 5, said skirt section further including a second channel wherein said skirt section is of a configuration defining a pair of side by side circumferentially extending channels, wherein said at least one channel and said second channel open in opposite axial directions, and further including a compression ring engagable in said second channel to produce radially directed sealing forces between said cover and riser section, wherein said skirt section is of an undulating, generally S-shaped cross section wherein said at least one channel and said second channel define an inner upwardly open channel of generally U-shaped cross-section and an outer downwardly open channel of generally U-shaped cross section, respectively.

Claim 9

A cover as claimed in claim 6 wherein said compression ring has a body portion of a cross-section generally conforming to said inner channel, and is of larger width than the width of said inner channel to provide a press fit therein and having radially directed inner and outer lips to overlie a portion of the top and a base portion of said adjacent outer channel.

Claim 10

A cover as claimed in claim 5 wherein said top section comprises a disk-like central portion and a downwardly diverging frusto conical annular portion between said central disk portion and said skirt section.

Claim 11

A cover as claimed in claim 8 further including air permeable, liquid impervious means in said disk like central portion to relieve pressure and avoid formation of a vacuum in the sump chamber.