US3752609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vane pump with fluid-biased end walls
Assignee: Vickers Inc
•
Filing: 1972-02-17
•
Granted: 1973-08-14
•
Expires: 1992-02-17
Abstract
Abstract A balanced vane pump has a body supporting the drive-shaft and clamping together the pumping cartridge. The cartridge includes an ovoid cam ring and a slotted rotor carrying radially slidable vanes. Flexible cheek plates are clamped against the cam ring and pressed toward the rotor and vanes by outlet pressure applied over limited areas defined by pressure pockets surrounding the outlet ports in the cheek plates.
Inventors
- 👤 A Niemiec
- 👤 R Pettibone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:12
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0003; F04C15/0023
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
A balanced vane pump comprising a first body portion forming a base, a driveshaft journalled in the base, a pumping cartridge supported by the base, a second body portion forming a head clamping the cartridge to the base, a third body portion comprising a cup-like cover secured to the base and enclosing the cartridge and the head, means forming an inlet passage in the cover, means forming an outlet passage in the base, the cartridge comprising a cam ring having an ovoid inTerior cavity, a rotor driven by the shaft and carrying radially slidable vanes, the rotor and vanes being slightly shorter axially than the cam ring, flexible cheek plates clamped at their peripheries against the sides of the cam ring and providing diametrically opposite arcuate inlet ports and diametrically opposite arcuate outlet ports, means at the interfaces of the cheek plates with the base and the head forming two pairs of pressure pockets surrounding the outlet ports, and elastomeric seals surrounding the pressure pockets.
Claim 2
Dependent Claim
165 words
A balanced vane pump comprising a first body portion forming a base, a driveshaft journalled in the base, a pumping cartridge supported by the base, a second body portion forming a head clamping the cartridge to the base, a third body portion comprising a cup-like cover secured to the base and enclosing the cartridge and the head, means forming an inlet passage in the cover, means forming an outlet passage in the base, the cartridge comprising a cam ring having an ovoid inTerior cavity, a rotor driven by the shaft and carrying radially slidable vanes, the rotor and vanes being slightly shorter axially than the cam ring, flexible cheek plates clamped at their peripheries against the sides of the cam ring and providing diametrically opposite arcuate inlet ports and diametrically opposite arcuate outlet ports, means at the interfaces of the cheek plates with the base and the head forming two pairs of pressure pockets surrounding the outlet ports, and elastomeric seals surrounding the pressure pockets.
Claim 3
Dependent Claim
24 words
A pump as defined in claim 1 wherein the pressure pockets extend circumferentially along arcs substantially twice the arcuate length of the outlet ports.
Claim 4
Dependent Claim
27 words
A pump as defined in claim 1 wherein the cheek plates are of laminar material including a layer of bearing material supported on a resilient backing material.
Claim 5
Dependent Claim
47 words
A pump as defined in claim 1 wherein the pockets comprise recesses of uniform depth and having irregularly curved outlines, the elastomeric seals comprising normally circular O-rings and filler pieces conforming to the outlines of the recesses and holding the O-ring against the peripheries of the pockets.
References Cited (Backward Citations)
US3193190A
Cited
US2544987A
Cited
US2924182A
Cited
US3194168A
Cited
US3204565A
Cited
US3303793A
Cited
US3479962A
Cited
US3549288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |