Patent US2847805A successfully refreshed from Google Patents.
US4028017A
Expired / Lapsed
US
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Manure pump having agitator piston
Assignee: KOBISKE IND Inc
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Filing: 1976-03-26
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Granted: 1977-06-07
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Expires: 1996-03-26
Abstract
Abstract A hopper having a bottom opening into an open topped chamber portion of a housing which defines a discharge passageway leading from the chamber to a discharge end portion. A piston is mounted for reciprocatory movements in the chamber portion and passageway. The piston having a pumping surface normal to the direction of its movement and facing the discharge end portion of the passageway. The piston has an opposite surface which slopes angularly upwardly toward the pumping surface. A check valve is disposed in the passageway at the discharge end portion of the passageway.
Inventors
- 👤 Gerald F. Kobiske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:43
CPC Classifications
F; F04; F04B; F04B15/00; F04B15/02; F04B15/023; A; A01; A01C; A01C3/00; A01C3/02; F04B53/00; F04B53/10; F04B53/14; Y; Y10; Y10S; Y10S417/00; Y10S417/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
A manure pump comprising: a. a supply hopper having an open bottom; b. a generally horizontally extending housing having one end supporting said hopper and defining an open topped chamber in register with the open bottom of said hopper and a generally horizontal discharge passageway leading from said chamber and having a discharge end portion; c. a piston reciprocably movable in said chamber and passageway and having a generally flat pumping surface facing said discharge end portion of the passageway said pumping surface being disposed in a plane normal to the direction of movement of the piston, and an opposite material mixing surface angularly displaced from said plane and sloping upwardly toward said pumping surface; d. guide means guiding said piston for reciprocatory pumping and return movements in said chamber and said passageway; e. means for imparting said reciprocatory movements to said piston; f. and check valve means in said housing normally closing said discharge end of the passageway.
Claim 2
Dependent Claim
159 words
A manure pump comprising: a. a supply hopper having an open bottom; b. a generally horizontally extending housing having one end supporting said hopper and defining an open topped chamber in register with the open bottom of said hopper and a generally horizontal discharge passageway leading from said chamber and having a discharge end portion; c. a piston reciprocably movable in said chamber and passageway and having a generally flat pumping surface facing said discharge end portion of the passageway said pumping surface being disposed in a plane normal to the direction of movement of the piston, and an opposite material mixing surface angularly displaced from said plane and sloping upwardly toward said pumping surface; d. guide means guiding said piston for reciprocatory pumping and return movements in said chamber and said passageway; e. means for imparting said reciprocatory movements to said piston; f. and check valve means in said housing normally closing said discharge end of the passageway.
Claim 3
Dependent Claim
55 words
The manure pump defined in claim 1 in which said check valve means comprises, a pair of cooperating valve plates, shaft means pivotally mounting said valve plates in said housing for swinging movements between valve open and valve closed positions in said passageway, and yielding means urging said valve plates toward said closed positions thereof.
Claim 4
Dependent Claim
90 words
The manure pump defined in claim 2 in which said shaft means comprises a pair of pivot shafts journaled in said housing at opposite sides of said passageway, said shafts each being secured to a different valve plate and each having an end extending through said housing, said yielding means comprising a pair of springs, each operatively connected to a different one of said shaft ends, said valve plates being moved to their valve open positions against bias of said springs responsive to piston imparted pressure of material against plates.
Claim 5
Dependent Claim
100 words
The manure pump defined in claim 1 in which said passageway is cross sectionally rectangular, said guide means comprising a pair of guide rails each mounted on an opposite side of said chamber and passageway and extending longitudinally of the direction of travel of the piston, said piston conforming in outline generally to the cross sectional shape of said passageway and having opposite flat sides defining channels for slidably receiving said guide rails, each guide rail including a pair of aligned rail sections one section of each pair being secured to said housing within said chamber for easy removal therefrom.
Claim 6
Dependent Claim
30 words
The manure pump defined in claim 4 in which said piston has an upper edge portion providing a flange projecting in the direction of said pumping movement of the piston.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |