Patent US4342546A successfully refreshed from Google Patents.
US4342546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air pump with centrifugal filter
Assignee: Motors Liquidation Co
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Filing: 1980-06-19
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Granted: 1982-08-03
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Expires: 2000-06-19
Abstract
Abstract In an air pump adapted to supply air to an engine exhaust system, an improved seal is provided between the pump housing and its centrifugal filter element.
Inventors
- 👤 Frederick L. J. Rehfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:58
CPC Classifications
F; F04; F04C; F04C29/00; F04C29/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
179 words
An air pump comprising a housing defining a pumping chamber having an end wall, a pumping member disposed in said chamber and having a shaft extending through said wall, said wall having an opening for air flow into said chamber, a rim extending outwardly from said wall concentric with said shaft and defining an annular recess between said rim and said shaft, and a centrifugal filter element mounted on said shaft and enclosing said recess to define an inlet plenum for air flow to said opening, said filter element having a plurality of curved passages extending substantially radially from the atmosphere at their outer ends to said plenum at their inner ends whereby foreign material is separated from and centrifuged out of the air flow through said passages to said plenum upon rotation of said shaft and said filter element, and wherein said filter element reaches beyond said rim and has a cylindrical extension which overlies and is closely adjacent the outer surface of said rim to inhibit passage of foreign material between said filter element and said rim.
Claim 2
Dependent Claim
179 words
An air pump comprising a housing defining a pumping chamber having an end wall, a pumping member disposed in said chamber and having a shaft extending through said wall, said wall having an opening for air flow into said chamber, a rim extending outwardly from said wall concentric with said shaft and defining an annular recess between said rim and said shaft, and a centrifugal filter element mounted on said shaft and enclosing said recess to define an inlet plenum for air flow to said opening, said filter element having a plurality of curved passages extending substantially radially from the atmosphere at their outer ends to said plenum at their inner ends whereby foreign material is separated from and centrifuged out of the air flow through said passages to said plenum upon rotation of said shaft and said filter element, and wherein said filter element reaches beyond said rim and has a cylindrical extension which overlies and is closely adjacent the outer surface of said rim to inhibit passage of foreign material between said filter element and said rim.
Claim 3
Dependent Claim
202 words
An air pump comprising a housing defining a pumping chamber having an end wall, a pumping member disposed in said chamber and having a shaft extending through said wall, said wall having an opening for air flow into said chamber, a rim extending outwardly from said wall concentric with said shaft and defining an annular recess between said rim and said shaft, and a centrifugal filter element mounted on said shaft and enclosing said recess to define an inlet plenum for air flow to said opening, said filter element having a plurality of curved passages extending substantially radially from the atmosphere at their outer ends to said plenum at their inner ends whereby foreign material is separated from and centrifuged out of the air flow through said passages to said plenum upon rotation of said shaft and said filter element, and wherein said filter element reaches beyond said rim and has a cylindrical extension which overlies the outer surface of said rim to inhibit passage of foreign material between said filter element and said rim, said extension having an inwardly extending lip which seals against said outer surface to further inhibit passage of foreign material between said filter element and said rim.
Claim 4
Dependent Claim
202 words
An air pump comprising a housing defining a pumping chamber having an end wall, a pumping member disposed in said chamber and having a shaft extending through said wall, said wall having an opening for air flow into said chamber, a rim extending outwardly from said wall concentric with said shaft and defining an annular recess between said rim and said shaft, and a centrifugal filter element mounted on said shaft and enclosing said recess to define an inlet plenum for air flow to said opening, said filter element having a plurality of curved passages extending substantially radially from the atmosphere at their outer ends to said plenum at their inner ends whereby foreign material is separated from and centrifuged out of the air flow through said passages to said plenum upon rotation of said shaft and said filter element, and wherein said filter element reaches beyond said rim and has a cylindrical extension which overlies the outer surface of said rim to inhibit passage of foreign material between said filter element and said rim, said extension having an inwardly extending lip which seals against said outer surface to further inhibit passage of foreign material between said filter element and said rim.
References Cited (Backward Citations)
US3356292A
Cited
US3370785A
Cited
US3419208A
Cited
US3437264A
Cited
US3437265A
Cited
US3790317A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-02 | 1986-02-01 | 1986-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-02 | 1990-02-01 | 1990-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-02 | 1994-02-01 | 1994-08-03 | $7700.00 | Window Closed / Lapsed |