Patent US3738581A successfully refreshed from Google Patents.
US3738581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Macerating pump with means for preventing blockages
Assignee: Oberdorfer Foundries Inc
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Filing: 1971-10-12
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Granted: 1973-06-12
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Expires: 1991-10-12
Abstract
Abstract A pump including means at the inlet for grinding maceratable solids into a pumpable slurry. One or more stripper picks or sharp projections extend radially inward adjacent the inlet side of a rotating grinder wheel having a sharp edged boss projecting outwardly to rotate in close proximity to the stationary point of the pick, thereby preventing rotational blockage by sewage masses entwining on the rotating wheel or stationary blockage to flow in advance of the wheel.
Inventors
- 👤 A Gallauresi
- 👤 W Kurgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:39
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/0084; B02C18/0092
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
138 words
A macerating pump unit having means to prevent blockages, said unit comprising in combination: a. power driven pump means having an inlet and outlet; b. macerating means within said inlet including a rotary cutting wheel disposed transversely to the direction of flow through said inlet, and having peripheral edge portions cooperable with adjacent stationary portions of said inlet to macerate solids passing therebetween; c. at least one projecting boss on the face of said wheel toward said inlet and located intermediate of the peripheral edge and center thereof, said boss terminating at a point substantially spaced from said edge; and d. at least one stationary element extending from an inner wall of said inlet to terminate in a sharp point in close proximity to the closest point passed by said boss as the latter rotates with said wheel.
Claim 2
Dependent Claim
138 words
A macerating pump unit having means to prevent blockages, said unit comprising in combination: a. power driven pump means having an inlet and outlet; b. macerating means within said inlet including a rotary cutting wheel disposed transversely to the direction of flow through said inlet, and having peripheral edge portions cooperable with adjacent stationary portions of said inlet to macerate solids passing therebetween; c. at least one projecting boss on the face of said wheel toward said inlet and located intermediate of the peripheral edge and center thereof, said boss terminating at a point substantially spaced from said edge; and d. at least one stationary element extending from an inner wall of said inlet to terminate in a sharp point in close proximity to the closest point passed by said boss as the latter rotates with said wheel.
Claim 3
Dependent Claim
15 words
The invention according to claim 1 wherein said pump comprises a non-positive displacement type pump.
Claim 4
Dependent Claim
14 words
The invention according to claim 2 wherein said pump comprises a rubber impeller pump.
Claim 5
Dependent Claim
21 words
The invention according to claim 1 wherein said inlet is circular in cross section and said stationary element extends radially thereinto.
Claim 6
Dependent Claim
14 words
The invention according to claim 1 wherein the position of said point is adjustable.
Claim 7
Dependent Claim
40 words
The invention according to claim 5 wherein said stationary element comprises a stripper pick engaged in a threaded opening in said inlet wall, and the position of said point is adjustable by advancing or retracting said pick through said opening.
Claim 8
Dependent Claim
30 words
The invention according to claim 6 wherein said point is positioned less than one-quarter inch from the closest point passed by said boss as the latter rotates with said wheel.
Claim 9
Dependent Claim
23 words
The invention according to claim 7 wherein said point is spaced both axially and radially from said closest point passed by said boss.
Claim 10
Dependent Claim
113 words
In A pump having inlet and outlet passages leading to and from a pumping chamber, macerating means positioned in said inlet passage comprising: a. a rotatable cutting wheel disposed transversely to the direction of flow through the inlet passage; b. a solid plate disposed across said inlet passage between said wheel and pumping chamber, and having an opening through which all flow from must pass in entering the pumping chamber, said opening being significantly smaller than the inlet passage; and c. a stationary member extending substantially radially into the inlet passage and terminating in a sharp point closely adjacent a cutting member extending from said wheel on the opposite side from said plate.
Claim 11
Dependent Claim
113 words
In A pump having inlet and outlet passages leading to and from a pumping chamber, macerating means positioned in said inlet passage comprising: a. a rotatable cutting wheel disposed transversely to the direction of flow through the inlet passage; b. a solid plate disposed across said inlet passage between said wheel and pumping chamber, and having an opening through which all flow from must pass in entering the pumping chamber, said opening being significantly smaller than the inlet passage; and c. a stationary member extending substantially radially into the inlet passage and terminating in a sharp point closely adjacent a cutting member extending from said wheel on the opposite side from said plate.
Claim 12
Dependent Claim
38 words
The invention according to claim 9 and further including stationary cutting edges on the inner wall of the inlet passage cooperable with said wheel to macerate solids passing between the periphery of the wheel and said inner wall.
Claim 13
Dependent Claim
29 words
The invention according to claim 10 wherein said wheel includes cutting edges on both the front and rear surfaces, those on the rear surface being closely adjacent said plate.
Claim 14
Dependent Claim
17 words
The invention according to claim 11 wherein said wheel further includes cutting edges on the periphery thereof.
Claim 15
Dependent Claim
26 words
The invention according to claim 12 wherein said cutting member comprises a projecting boss on said front surface of said wheel, displaced from the center thereof.
Claim 16
Dependent Claim
27 words
The invention according to claim 13 wherein said boss is substantially square and passes within less than one-quarter inch of said point during rotation of said wheel.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |