US3695437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil filter with improved anti-drainback valve
Assignee: Hastings Manufacturing Co
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Filing: 1971-01-11
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Granted: 1972-10-03
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Expires: 1991-01-11
Abstract
Abstract A combined cartridge seating and oil drainback preventing member is interposed between a filter cartridge and the end plate of a cartridge casing. The member is of elastomeric material and includes a thick inner annular edge portion in engagement with the end plate between oil inlet and oil outlet openings, and a thin outer annular body portion which overlies the inlet openings but is deflectable by pressure of incoming oil The thick inner annular edge portion of the member is formed with a wide flat annular seat for a tubular adapter on the cartridge which is frictionally received in the seat so that the member may be supported on the adapter as a unit prior to and during assembly of the cartridge in the casing. The member is shaped so that upon its installation in the filter, its outer body portion is resiliently biased toward the end plate.
Inventors
- 👤 Robert J Shaltis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:52
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/08; B01D27/10; B01D27/103; B01D27/106
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
In a disposable oil filter, the combination of a cup-shaped casing having an end plate provided with a central oil outlet opening and with a set of oil inlet openings arranged in a circle around said outlet opening, a filter cartridge disposed in said casing and resiliently biased toward said end plate, a tubular adapter provided centrally on said cartridge adjacent the end plate, and a combined cartridge seating and oil drainback preventing gasket-like member interposed between the end plate and said adapter and separable therefrom, said member being formed integrally from elastomeric material and comprising a ring having a relatively thick inner annular edge portion engaging said end plate between said oil inlet and outlet openings and also having a relatively thin outer annular body portion which overlies said inlet openings but is deflectable from said end plate by pressure of incoming oil, the inner annular edge portion of said gasket-lIke member being provided with an annular seat frictionally receiving said adapter therein whereby said member may be supported on the adapter as a unit prior to and during assembly of said cartridge in said casing(.), said adapter being provided with an outturned annular lip, and said annular seat in said gasket-like member being flat and provided with an annular undercut having said lip disposed therein, whereby to positively assist in supporting said member on said adapter as aforesaid.
Claim 2
Dependent Claim
230 words
In a disposable oil filter, the combination of a cup-shaped casing having an end plate provided with a central oil outlet opening and with a set of oil inlet openings arranged in a circle around said outlet opening, a filter cartridge disposed in said casing and resiliently biased toward said end plate, a tubular adapter provided centrally on said cartridge adjacent the end plate, and a combined cartridge seating and oil drainback preventing gasket-like member interposed between the end plate and said adapter and separable therefrom, said member being formed integrally from elastomeric material and comprising a ring having a relatively thick inner annular edge portion engaging said end plate between said oil inlet and outlet openings and also having a relatively thin outer annular body portion which overlies said inlet openings but is deflectable from said end plate by pressure of incoming oil, the inner annular edge portion of said gasket-lIke member being provided with an annular seat frictionally receiving said adapter therein whereby said member may be supported on the adapter as a unit prior to and during assembly of said cartridge in said casing(.), said adapter being provided with an outturned annular lip, and said annular seat in said gasket-like member being flat and provided with an annular undercut having said lip disposed therein, whereby to positively assist in supporting said member on said adapter as aforesaid.
Claim 3
Dependent Claim
48 words
The device as defined in claim 1 wherein said gasket-like member also includes a reduced annular neck portion connecting said outer body portion to said inner edge portion, said neck portion affording fulcrum means for movement of said outer body portion toward and away from said end plate.
Claim 4
Dependent Claim
86 words
The device as defined in claim 1 wherein said outer annular body portion of said gasket-like member has a shallow frusto-conical form with its major end oriented toward said end plate and its minor end surrounding said seat, the angular magnitude of said frustoconical form being greater when said member is relaxed prior to its installation in the filter than it is after the member is installed, whereby said outer annular body portion of the installed member is pre-stressed and resiliently biased toward said end plate.
Claim 5
Dependent Claim
66 words
The device as defined in claim 1 wherein said inner annular edge portion of said gasket-like member includes an inner cylindrical surface portion, a curved bottom portion joining said inner cylindrical surface portion at one extreme, and an upwardly and outwardly diverging outer surface portion extending from the bottom extreme of said curved bottom portion to a juncture with said relatively thin outer annular body portion.
Claim 6
Dependent Claim
41 words
The device as defined in claim 4 wherein said end plate is provided with an inwardly, and axially extending boss surrounding said central oil outlet opening, and wherein said inner cylindrical surface portion of said gasket-like member loosely surrounds said boss.
Claim 7
Dependent Claim
48 words
The device as defined in claim 4 wherein the said curved bottom portion and said upwardly and outwardly divergent outer surface portion form at their juncture an edge which provides a relatively narrow annular area of contact between said thick inner annular edge portion and said end plate.
Claim 8
Dependent Claim
59 words
The device as defined in claim 6 wherein said tubular adapter has a base portion which rests on said annular seat, said base portion being of a diameter such that while it rests on said annular seat the base portion overlies said relatively narrow annular area of contact between said thick inner annular edge portion and said end plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |