Patent US3575536A successfully refreshed from Google Patents.
US3575536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump for beverage dispenser
Assignee: Jet Spray Cooler Inc
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Filing: 1969-02-07
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Granted: 1971-04-20
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Expires: 1989-02-07
Abstract
Abstract A pump assembly for beverage dispensers having a pump chamber within which an impeller is disposed free of any shaft and bushing connections. A magnet embedded in the impeller cooperates with the driving magnet outside the chamber to align the impeller and support it on its bearing for rotation.
Inventors
- 👤 William H Jacobs
- 👤 William A Azberger
- 👤 Robert L Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:50
CPC Classifications
B; B67; B67D; B67D1/00; B67D1/08; B67D1/10; F; F04; F04D; F04D13/00; F04D13/02; F04D13/021; F04D13/024; F04D13/026; F04D13/027
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
174 words
A vertically arranged pump assembly for beverage dispensers comprising: a beverage bowl, a pump cover in the bowl and cooperating with the bowl bottom to form a pump chamber, an impeller disposed in the chamber and supported on the bottom wall of the chamber, and being generally disc-shaped and bearing impeller blades, means supporting said impeller totally free of any mechanical interengaging connections to the surface of said chamber being said impeller positionable freely within said chamber within the dimensional limits defined by said chamber, said impeller having a surface free of any crevices which would entrap quantities of said beverage to be pumped, a magnet imbedded in the impeller and adapted to be magnetically coupled to a drive magnet disposed adjacent to it, said means supporting said impeller comprising a bearing operatively engaging the center of the impeller at its bottom for supporting the impeller for rotation in the chamber on said bottom wall, said bearing allowing the impeller to rotate about its center and shift freely within the chamber when at rest.
Claim 2
Dependent Claim
174 words
A vertically arranged pump assembly for beverage dispensers comprising: a beverage bowl, a pump cover in the bowl and cooperating with the bowl bottom to form a pump chamber, an impeller disposed in the chamber and supported on the bottom wall of the chamber, and being generally disc-shaped and bearing impeller blades, means supporting said impeller totally free of any mechanical interengaging connections to the surface of said chamber being said impeller positionable freely within said chamber within the dimensional limits defined by said chamber, said impeller having a surface free of any crevices which would entrap quantities of said beverage to be pumped, a magnet imbedded in the impeller and adapted to be magnetically coupled to a drive magnet disposed adjacent to it, said means supporting said impeller comprising a bearing operatively engaging the center of the impeller at its bottom for supporting the impeller for rotation in the chamber on said bottom wall, said bearing allowing the impeller to rotate about its center and shift freely within the chamber when at rest.
Claim 3
Dependent Claim
31 words
A pump assembly as described in claim 1 further characterized by: said impeller bearing comprising a ball bearing and a self lubricating seat for the ball being embedded in the impeller.
Claim 4
Dependent Claim
45 words
A pump assembly as described in claim 1 further characterized by: said bearing comprising a pin made of self lubricating material embedded in the impeller and having a supporting end extending blow the plane of the impeller bottom and resting loosely on the bottom wall.
Claim 5
Dependent Claim
33 words
A pump assembly as described in claim 2 further characterized by an annular seat secured to the bottom wall of the chamber for releasably restraining the ball in the center of the chamber.
Claim 6
Dependent Claim
32 words
A pump assembly as described in claim 3 further characterized by said blades lying in the top of the impeller body, and an inlet in the cover providing access to the chamber.
Claim 7
Dependent Claim
31 words
A pump assembly as described in claim 4 further characterized by said blades lying the top of the impeller body, and an inlet in the cover providing access to the chamber.
Claim 8
Dependent Claim
20 words
A pump assembly as defined in claim 1 further characterized by said bearing being a pin having a smooth surface.
Claim 9
Dependent Claim
44 words
A pump assembly as described in claim 7 further characterized by: said being being a pin made of self lubricating material embedded in the impeller and having a supporting end extending below the plane of the impeller bottom and resting on the bottom wall.
Claim 10
Dependent Claim
23 words
A pump assembly as described in claim 3 further characterized by said supporting end being semispherical and facing down on the bowl bottom.
References Cited (Backward Citations)
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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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |