Patent US3756750A successfully refreshed from Google Patents.
US3756750A
Expired / Lapsed
US
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Reciprocating valveless pump
Assignee: RALPH C HAGEN (USA) CORP 50 HAMPDEN ROAD MANSFIELD MASSACHUSETTS A CORP OF MASSACHUSETTS
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Filing: 1971-07-20
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Granted: 1973-09-04
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Expires: 1991-07-20
Abstract
Abstract A valveless pump comprising a housing which is separated into first and second chambers, the second chamber being of annular extent and surrounding the first chamber. A magnetic assembly is provided in the second chamber for generating a magnetic field and for causing a water-ejecting magnetically responsive hollow piston to reciprocate axially along the first chamber in which the piston is freely disposed. The housing furthermore includes water inlet means for directing water into the first chamber and water outlet means for receiving water ejected from the first chamber by the piston. The water inlet means is submergible in water and separated from the second chamber for permitting maintaining the second chamber free from submerging in water during the water ejection by the piston.
Inventors
- 👤 W Summerfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:05
CPC Classifications
F; F04; F04F; F04F7/00; F04B; F04B17/00; F04B17/03; F04B17/04; F04B17/046
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
272 words
A valveless pump comprising a housing, said housing including magnetic means for generating a magnetic field disposed within an outer chamber of said housing, said outer chamber surrounding and being closed from an inner chamber of said housing, said housing being provided with a lower extending hollow member communicating with said inner chamber, closure means closing a lower end of said hollow member, said hollow member being provided with at least one water-inlet opening in a side wall of said hollow member for providing a flow of water to said inner chamber, a tubular outlet member extending through said inner chamber with an open end of said outlet member disposed in said hollow member above said water-inlet opening, a water-ejecting magnetically responsive hollow piston movably disposed in said hollow member for association with said magnetic means with an upper portion of said piston slideably surrounding said outlet member in a concentrical arrangement, said piston including a lower end portion facing said closure means, said piston lower end portion being provided with a water-ejecting opening of smaller size than said upper piston portion which surrounds said outlet member, and at least one opEning in a side wall of said piston communicating with each of said water-inlet opening, said outlet member open end and said water-ejecting opening, whereby said water-ejecting opening directs jets of water toward said outlet member open end as said magnetic means force said piston toward said closure means when said hollow member is disposed in water with said water-inlet opening submerged below water level where said piston side wall opening permits said hollow member to be constantly filled with water.
Claim 2
Dependent Claim
272 words
A valveless pump comprising a housing, said housing including magnetic means for generating a magnetic field disposed within an outer chamber of said housing, said outer chamber surrounding and being closed from an inner chamber of said housing, said housing being provided with a lower extending hollow member communicating with said inner chamber, closure means closing a lower end of said hollow member, said hollow member being provided with at least one water-inlet opening in a side wall of said hollow member for providing a flow of water to said inner chamber, a tubular outlet member extending through said inner chamber with an open end of said outlet member disposed in said hollow member above said water-inlet opening, a water-ejecting magnetically responsive hollow piston movably disposed in said hollow member for association with said magnetic means with an upper portion of said piston slideably surrounding said outlet member in a concentrical arrangement, said piston including a lower end portion facing said closure means, said piston lower end portion being provided with a water-ejecting opening of smaller size than said upper piston portion which surrounds said outlet member, and at least one opEning in a side wall of said piston communicating with each of said water-inlet opening, said outlet member open end and said water-ejecting opening, whereby said water-ejecting opening directs jets of water toward said outlet member open end as said magnetic means force said piston toward said closure means when said hollow member is disposed in water with said water-inlet opening submerged below water level where said piston side wall opening permits said hollow member to be constantly filled with water.
Claim 3
Dependent Claim
46 words
A valveless pump as claimed in claim 1, wherein said water-ejecting opening is generally frusto-conical in cross-section defining minor and major diametral extents, said minor diametral extent being directed toward said outlet member open end and said major diametral extent being directed toward said closure means.
Claim 4
Dependent Claim
37 words
A valveless pump as claimed in claim 1, wherein said magnetic means includes an electro-magnet and a permanent magnet in operative association with each other for coacting on said piston to provide reciprocating movement for said piston.
Claim 5
Dependent Claim
32 words
A valveless pump as claimed in claim 4, wherein a magnetically responsive metal element is disposed on said upper portion of said piston for association with said electromagnet and said permanent magnet.
Claim 6
Dependent Claim
24 words
A valveless pump as claimed in claim 12, wherein said hollow member includes securing means for detachably connecting said hollow member to said housing.
Claim 7
Dependent Claim
49 words
A valveless pump as claimed in claim 12, wherein said closure means includes a plug provided with an adjusting member for permitting movement of said plug within said hollow member to any one of a plurality of stationary closing positions for controlling amount of water ejected by said piston.
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |