Filter assembly including an attachment member for a removable filter cartridge

1. A filter assembly comprising a canister housing closable by a lid and containing a removable and replaceable filter element cartridge, said lid being part of said filter element cartridge and a single unitary component therewith, such that removal of said filter element cartridge also removes said lid, and replacement of said filter element cartridge also replaces said lid, said filter assembly further comprising an attachment member coacting between said canister housing and said lid, said attachment member having a locked position in which the attachment member engages said lid to join said single unitary component to said canister housing and having an unlocked position permitting withdrawal of said single unitary component from said canister housing, said attachment member comprising an upper end engaging said lid in the locked position, and said attachment member extending axially into a hollow interior of said filter element cartridge in the locked position.

2. The filter assembly according to claim 1 wherein said attachment member biases said lid into sealing engagement with said canister housing with said filter element cartridge in said canister housing in the locked position.

3. The filter assembly according to claim 2 wherein said canister housing extends axially along an axis between first and second distally opposite ends, said first end being an open mouth receiving said filter element cartridge inserted axially therethrough and then being closed by said lid, said filter element cartridge extending axially along said axis, said hollow interior extending axially, said canister housing having a circumferential sidewall spaced radially outwardly of said filter element cartridge, said filter element cartridge having an outer sidewall surface facing said circumferential sidewall of said canister housing, and having an inner sidewall surface facing said hollow interior, wherein said lid spans said open mouth and is biased by said attachment member in said locked position into sealing engagement with said circumferential sidewall of said canister housing at said first end.

4. The filter assembly according to claim 3 wherein said lid has a central aperture axially aligned with said hollow interior of said filter element cartridge, said central aperture has a sidewall with an inner shoulder axially facing said hollow interior of said filter element cartridge, and a distally opposite outer shoulder axially facing away from said hollow interior of said filter element cartridge, and said attachment member engages said lid at said outer shoulder of said sidewall of said central aperture.

5. The filter assembly according to claim 4 wherein said attachment member has a flange having a greater diameter than said central aperture, and wherein said flange extends laterally beyond said central aperture and overlaps said outer shoulder in axially aligned relation.

6. The filter assembly according to claim 5 wherein said attachment member comprises a shank extending from said flange axially into said hollow interior and engaging said canister housing to attach said lid thereto.

7. The filter assembly according to claim 6 wherein said shank threadingly engages said canister housing at said second end of said canister housing.

8. The filter assembly according to claim 3 wherein said locked position said lid is sealed to said canister housing at a radial seal at said circumferential sidewall.

9. A removable and replaceable filter element cartridge for a filter assembly having a canister housing closable by a lid and containing said removable and replaceable filter element cartridge, said filter element cartridge being part of said lid and a single unitary component therewith, such that removal of said filter element cartridge also removes said lid, and replacement of said filter element cartridge also replaces said lid, wherein said filter assembly includes an attachment member coacting between said canister housing and said lid, said attachment member having a locked position in which the attachment member engages said lid to join said single unitary component to said canister housing and having an unlocked position permitting withdrawal of said single unitary component from said canister housing, said attachment member comprising an upper end engaging said lid in the locked position, and said attachment member extending axially into a hollow interior of said filter element cartridge in the locked position.

10. The removable and replaceable filter element cartridge according to claim 9 wherein said biases said lid into sealing engagement with said canister housing with said filter element cartridge in said canister housing in the locked position.

11. The removable and replaceable filter element cartridge according to claim 10 wherein said canister housing extends axially along an axis between first and second distally opposite ends, said first end being an open mouth receiving said filter element cartridge inserted axially therethrough and then being closed by said lid, said filter element cartridge extending axially along said axis, said hollow interior extending axially, said canister housing having a circumferential sidewall spaced radially outwardly of said filter element cartridge, said filter element cartridge having an outer sidewall surface facing said circumferential sidewall of said canister housing, and having an inner sidewall surface facing said hollow interior, wherein said lid spans said open mouth and is biased by said attachment member in said locked position into sealing engagement with said circumferential sidewall of said canister housing at said first end.

12. The removable and replaceable filter element cartridge according to claim 11 wherein said lid has a central aperture axially aligned with said hollow interior of said filter element cartridge, said central aperture has a sidewall with an inner shoulder axially facing said hollow interior of said filter element cartridge, and a distally opposite outer shoulder axially facing away from said hollow interior of said filter element cartridge, and said attachment member engages said lid at said outer shoulder of said sidewall of said central aperture.