US4057225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw feeder for granular material
Assignee: Esm Inc
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Filing: 1976-07-14
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Granted: 1977-11-08
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Expires: 1996-07-14
Abstract
Abstract A screw feeder comprising a pair of augers of different diameters, coaxially and co-extensively arranged, which are driven by separate motors, one of which drives a mixing drum and auger of larger diameter, and the other drives the auger of smaller diameter. By rotating the outer auger at the slower speed of the drum and the inner auger at a higher speed, the particles or granular material fed to the augers will be thoroughly and uniformly mixed as well as propelled outwardly of the feed bin by screw feed action.
Inventors
- 👤 Roy E. Ferree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:39
CPC Classifications
B; B01; B01F; B01F35/00; B01F35/71; B01F35/717; B01F35/71775; B01F35/7173; B01F35/71731
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A screw feeding apparatus for particulate matter, comprising a feed chamber in which is mounted a pair of concentric augers which are substantially co-extensive in length, variable speed drive means for driving the inner auger of smaller diameter, a rotating housing rigidly connected, at one end, to the outer auger of greater diameter and surrounding a portion of the inner auger, a drum rigidly connected at the other end of said rotating housing, and a separate driving means for driving said drum about its axis.
Claim 2
Dependent Claim
85 words
A screw feeding apparatus for particulate matter, comprising a feed chamber in which is mounted a pair of concentric augers which are substantially co-extensive in length, variable speed drive means for driving the inner auger of smaller diameter, a rotating housing rigidly connected, at one end, to the outer auger of greater diameter and surrounding a portion of the inner auger, a drum rigidly connected at the other end of said rotating housing, and a separate driving means for driving said drum about its axis.
Claim 3
Dependent Claim
50 words
The screw feeding apparatus recited in claim 1 together with a stationary housing surrounding said rotating housing and which sealed at least one end thereto, and wherein said last named driving means is driven by a variable speed motor through a chain drive for reducing the speed of said drum.
Claim 4
Dependent Claim
41 words
Apparatus as recited in claim 1 wherein said outer auger is of rectangular cross-section and wherein said means for attaching said outer auger to one end of said rotating drum includes a stud bridging about one turn of said outer auger.
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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |