Patent US3822796A successfully refreshed from Google Patents.
US3822796A
Expired / Lapsed
US
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Differential auger material collector
Assignee: VAN DALE COMPANIES Inc
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Filing: 1972-11-24
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Granted: 1974-07-09
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Expires: 1992-11-24
Abstract
Abstract A surface or top silo unloader of the type having leading and trailing counter-rotating augers for gathering material to the center of the silo and delivering it to an impeller which discharges the material from the silo. The trailing auger has a diameter greater than the leading auger and operates at a slower rate of speed. The augers have outwardly projected knives for cutting the material.
Inventors
- 👤 F Buschbom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:30
CPC Classifications
A; A01; A01F; A01F25/00; A01F25/16; A01F25/20; A01F25/2009
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
99 words
A material collector means for a material handling apparatus having a discharge means for moving material comprising: first leading auger means and second trailing auger means located behind and generally parallel to the first auger means for moving material toward the discharge means, said second auger means having a diameter greater than the diameter of the first auger means, outwardly projected knives secured to the second auger means, and drive means for rotating the first and second auger means in opposite rotational directions, said drive means operable to rotate the first auger means faster than the second auger means.
Claim 2
Dependent Claim
99 words
A material collector means for a material handling apparatus having a discharge means for moving material comprising: first leading auger means and second trailing auger means located behind and generally parallel to the first auger means for moving material toward the discharge means, said second auger means having a diameter greater than the diameter of the first auger means, outwardly projected knives secured to the second auger means, and drive means for rotating the first and second auger means in opposite rotational directions, said drive means operable to rotate the first auger means faster than the second auger means.
Claim 3
Dependent Claim
16 words
The collector means of claim 1 wherein: the first auger means has a continuous spiral flight.
Claim 4
Dependent Claim
43 words
The collector means of claim 2 wherein: the second auger means has a continuous spiral flight larger in diameter than the spiral flight of the first auger means, said knives being secured to outer portions of the Flight of the second auger means.
Claim 5
Dependent Claim
28 words
The collector means of claim 1 wherein: the drive means rotates the first auger means in the rotational direction which moves the collector means in the forward direction.
Claim 6
Dependent Claim
18 words
The collector means of claim 1 wherein: the first auger means is longer than the second auger means.
Claim 7
Dependent Claim
29 words
The collector means of claim 1 wherein: said drive means operates to rotate said first and second auger means at a speed ratio of approximately 4 to 3 respectively.
Claim 8
Dependent Claim
39 words
The collector means of claim 1 including: means to rotatably support the first auger means and the second auger means about separate generally parallel axes, said axes being spaced from each other and located in a generally horizontal plane.
Claim 9
Dependent Claim
27 words
The collector means of claim 1 wherein: the trailing auger means has a diameter at least 1 inch greater than the diameter of the leading auger means.
Claim 10
Dependent Claim
23 words
The collector means of claim 1 wherein: the leading auger means is rotated at least 50 rpm faster than the trailing auger means.
Claim 11
Dependent Claim
44 words
The collector means of claim 1 wherein: the trailing auger means has a diameter at least 1 inch greater than the diameter of the leading auger means, and the leading auger means is rotated at least 50 rpm faster than the trailing auger means.
Claim 12
Dependent Claim
25 words
The collector means of claim 10 wherein: the trailing auger means has a diameter of at least 8 inches and is rotated about 200 rpm.
Claim 13
Dependent Claim
18 words
The collector means of claim 10 wherein: the knives each have a forwardly and inwardly inclined cutting edge.
Claim 14
Dependent Claim
18 words
The collector means of claim 1 wherein: the knives each have a forwardly and inwardly inclined cutting edge.
Claim 15
Dependent Claim
28 words
The collector means of claim 1 wherein: the leading auger means is rotated at least 270 rpm and the trailing auger means is rotated at least 200 rpm.
Claim 16
Dependent Claim
19 words
The collector means of claim 1 including: a plurality of outwardly projected knives secured to the first auger means.
Claim 17
Dependent Claim
27 words
The collector means of claim 15 including: means on the first auger means whereby a selected number of knives can be secured to the first auger means.
References Cited (Backward Citations)
US3143378A
Cited
US3547283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |