Patent US3767047A successfully refreshed from Google Patents.
US3767047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for screening seed and the like materials
Assignee: Damas J Nielsens Maskinfabrik AS
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Filing: 1971-10-12
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Granted: 1973-10-23
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Expires: 1991-10-12
Abstract
Abstract Seed screening apparatus having two vertically arranged screening drums suspended from vertical shafts which are supported by means of a main shaft, said main shaft being provided with driving means for rotating the main shaft and accordingly apply a planetary motion to the drum shafts during which planetary movement the drums rotate about their shafts, means being provided for creating a pressure outside the drums which is lower than the pressure prevailing inside the drums.
Inventors
- 👤 S Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:23
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/18; B07B1/22; B07B1/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
329 words
Apparatus for screening seed particles and the like, comprising a stationary outer housing, a vertical central shaft rotatably supported in said housing, at least two vertical planetary shafts supported by said central shaft, screening drums rotatably supported within said housing on each of said planetary shafts coaxially with said respective planetary shafts, each of said drums comprising at least an innermost and an outermost coaxially arranged screen, driving means rotating said drums about said central shaft and simultaneously rotating said screening drums on said planetary shafts, a hopper provided with a number of outlets corresponding to the number of screening drums, each said outlet communicating with the interior of the innermost screen of each drum through the open ends thereof, an inlet tube for material to be screened being positioned at the top of said housing and communicating with the interior of said hopper, an air by-pass opening which opens into the outer atmosphere and into the interior of said hopper surrounding said inlet tube, a first collecting channel supported by said housing below said drums and communicating via duct means mounted on said central shaft with the interior of the innermost screens of said drums, vane means projecting into said first collecting channel being secured to said duct means communicating with said first collecting channel, a second collecting channel supported by said housing below said drums and communicating via other duct means mounted on said central shaft with the spacings between the screens of said drums, other vane means projecting into said second collecting channel being secured to said duct means mounted on said central shaft communicating with said second collecting channel, a third collecting channel supported by said housing and communicating with the exterior of said drums, still other vane means proJecting into said third collecting channel being distributed along the full circumference of a plate secured to said central shaft and supporting said duct means said other vane means being curved and closely adjacent each other.
Claim 2
Dependent Claim
329 words
Apparatus for screening seed particles and the like, comprising a stationary outer housing, a vertical central shaft rotatably supported in said housing, at least two vertical planetary shafts supported by said central shaft, screening drums rotatably supported within said housing on each of said planetary shafts coaxially with said respective planetary shafts, each of said drums comprising at least an innermost and an outermost coaxially arranged screen, driving means rotating said drums about said central shaft and simultaneously rotating said screening drums on said planetary shafts, a hopper provided with a number of outlets corresponding to the number of screening drums, each said outlet communicating with the interior of the innermost screen of each drum through the open ends thereof, an inlet tube for material to be screened being positioned at the top of said housing and communicating with the interior of said hopper, an air by-pass opening which opens into the outer atmosphere and into the interior of said hopper surrounding said inlet tube, a first collecting channel supported by said housing below said drums and communicating via duct means mounted on said central shaft with the interior of the innermost screens of said drums, vane means projecting into said first collecting channel being secured to said duct means communicating with said first collecting channel, a second collecting channel supported by said housing below said drums and communicating via other duct means mounted on said central shaft with the spacings between the screens of said drums, other vane means projecting into said second collecting channel being secured to said duct means mounted on said central shaft communicating with said second collecting channel, a third collecting channel supported by said housing and communicating with the exterior of said drums, still other vane means proJecting into said third collecting channel being distributed along the full circumference of a plate secured to said central shaft and supporting said duct means said other vane means being curved and closely adjacent each other.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |