Patent US3578880A successfully refreshed from Google Patents.
US3578880A
Expired / Lapsed
US
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Diaphragm operated priming device for centrifugal impeller pump
Assignee: Colt Industries Operating Corp
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Filing: 1969-07-24
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Granted: 1971-05-18
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Expires: 1989-07-24
Abstract
Abstract A shaft driven centrifugal impeller pump has a priming arrangement associated with its collector section and drive shaft. A continuously operated diaphragm-type positive displacement pump is operatively connected to a cam mounted on the drive shaft to cause air to flow out of the collector section, into a chamber of the positive displacement pump, out of the chamber and through a conduit connected to the impeller pump''s discharge line. A spring loaded shutoff valve prevents a flow from the collector section to the discharge line until the fluid pressure in the collector section forces the valve open. A passage interconnects the chamber of the displacement pump and the collector section to pressure balance the diaphragm.
Inventors
- 👤 John E Cygnor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:18
CPC Classifications
F; F04; F04D; F04D9/00; F04D9/04; F04D9/043
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
In a pump, the combination comprising: an impeller pump having an inlet and a discharge cavity; a positive displacement pump having a chamber, a flow inlet port and a flow outlet port, the inlet port and outlet port communicating with the chamber, the positive displacement pump serving to prime the impeller pump; an inlet conduit means interconnecting the cavity and the inlet port; an outlet conduit means interconnecting the cAvity and the outlet port; a pair of check valves respectively controlling the inlet and outlet conduit means for preventing return flows therein; a movable member mounted within the chamber of the positive displacement pump dividing the chamber into two smaller chambers, one of the smaller chambers communicating with the inlet and outlet ports; a passageway means interconnecting the discharge cavity and the other of said smaller chambers to pressure balance the movable member; and a drive mechanism operatively connected to the movable member for imparting reciprocating movement thereto.
Claim 2
Dependent Claim
158 words
In a pump, the combination comprising: an impeller pump having an inlet and a discharge cavity; a positive displacement pump having a chamber, a flow inlet port and a flow outlet port, the inlet port and outlet port communicating with the chamber, the positive displacement pump serving to prime the impeller pump; an inlet conduit means interconnecting the cavity and the inlet port; an outlet conduit means interconnecting the cAvity and the outlet port; a pair of check valves respectively controlling the inlet and outlet conduit means for preventing return flows therein; a movable member mounted within the chamber of the positive displacement pump dividing the chamber into two smaller chambers, one of the smaller chambers communicating with the inlet and outlet ports; a passageway means interconnecting the discharge cavity and the other of said smaller chambers to pressure balance the movable member; and a drive mechanism operatively connected to the movable member for imparting reciprocating movement thereto.
Claim 3
Dependent Claim
40 words
The combination of claim 1, wherein there is further provided: a discharge shutoff valve mounted in the cavity intermediate the inlet and outlet conduits for blocking a flow from the impeller pump until a sufficient discharge pressure is exerted thereupon.
Claim 4
Dependent Claim
47 words
The combination of claim 1, wherein the drive mechanism comprises: a rotatable shaft drivingly connected to the impeller pump; a cam integral with the shaft; an element interconnecting the cam and the movable member such that rotation of the shaft produces reciprocating movement of the movable member.
Claim 5
Dependent Claim
25 words
The combination of claim 1, wherein the movable member comprises: a diaphragm sealingly mounted to the walls of the chamber of the positive displacement pump.
Claim 6
Dependent Claim
26 words
The combination of claim 1 wherein the drive mechanism comprises: means to continuously impart reciprocating movement to the movable member during operation of the impeller pump.
References Cited (Backward Citations)
FR428121A
Cited
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Cited
US2292896A
Cited
US2472802A
Cited
US2666393A
Cited
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Cited
GB804265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |