US3628898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twin ellipse pump
Assignee: Individual
•
Filing: 1970-04-20
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Granted: 1971-12-21
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Expires: 1990-04-20
Abstract
Abstract In the new and improved pump disclosed herein, a pair of counterrotating crossed arms of unequal lengths are respectively rotatably mounted in the center of a pair of semicylindrical overlapping chambers. Rollers on the outer ends of each of the arms are rollingly engaged within a resilient elliptically shaped band disposed around the walls of each chamber and resiliently coengaged with the other band at a point midway between the two chambers to separate a common fluid inlet and outlet. Each pair of the arms has one longer arm with an overall length substantially equal to the diameter of the chambers so that counterrotation of the arms will move the rollers on the longer arms around the bands to press successive portions of the bands against the adjacent cylinder walls for forming progressively advancing fluid displacement spaces around the perimeter of the cylinders to conduct fluids from the inlet to the outlet.
Inventors
- 👤 Edwin C Bragdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:43
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/126; F04C5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
269 words
A rotary pump comprising: a housing having an inlet and outlet on opposite sides thereof and having first and second semicylindrical chambers on opposite sides thereof and disposed in an overlapping relationship; first and second rotors cooperatively arranged side-by-side for rotation in said first and second chambers respectively, each of said rotors comprised of a longer arm perpendicularly intersected with a shorter arm, and a plurality of rollers respectively mounted on the outer ends of said arms, the rollers on said longer arms being positioned thereon for rotation in a circular path substantially adjacent to the walls of their respective chamber and the rollers on said first shorter arms being positioned thereon for rotation in a circular path of lesser diameter approaching tangential intersection with the circular path of lesser diameter of said rollers on said second shorter arms; first and second endless resilient bands of a substantially elliptical configuration respectively arranged around said rollers of said first and second rotors and adapted for being progressively pressed against said chamber walls as said rollers on said longer arms are successively rollingly engaged around said bands upon counter rotation of rotors in their respective chamber portions for trapping fluids between said chamber walls and said bands and progressively forcing such trapped fluids from said inlet to said outlet, said first and second bands being engaged with one another at about the tangential intersection of said circular paths of lesser diameter for blocking direct fluid communication between said inlet and said outlet; and first and second means coupled to said first and second rotors and adapted for counter rotating said rotors.
Claim 2
Dependent Claim
269 words
A rotary pump comprising: a housing having an inlet and outlet on opposite sides thereof and having first and second semicylindrical chambers on opposite sides thereof and disposed in an overlapping relationship; first and second rotors cooperatively arranged side-by-side for rotation in said first and second chambers respectively, each of said rotors comprised of a longer arm perpendicularly intersected with a shorter arm, and a plurality of rollers respectively mounted on the outer ends of said arms, the rollers on said longer arms being positioned thereon for rotation in a circular path substantially adjacent to the walls of their respective chamber and the rollers on said first shorter arms being positioned thereon for rotation in a circular path of lesser diameter approaching tangential intersection with the circular path of lesser diameter of said rollers on said second shorter arms; first and second endless resilient bands of a substantially elliptical configuration respectively arranged around said rollers of said first and second rotors and adapted for being progressively pressed against said chamber walls as said rollers on said longer arms are successively rollingly engaged around said bands upon counter rotation of rotors in their respective chamber portions for trapping fluids between said chamber walls and said bands and progressively forcing such trapped fluids from said inlet to said outlet, said first and second bands being engaged with one another at about the tangential intersection of said circular paths of lesser diameter for blocking direct fluid communication between said inlet and said outlet; and first and second means coupled to said first and second rotors and adapted for counter rotating said rotors.
Claim 3
Dependent Claim
16 words
The rotary pump of claim 1 wherein said first and second bands are formed of metal.
Claim 4
Dependent Claim
16 words
The rotary pump of claim 1 wherein said first and second bands are formed of rubber.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |