Classifying – separating – and assorting solids – Sifting – Combined type
Patent
1991-06-18
1993-09-28
Hajec, Donald T.
Classifying, separating, and assorting solids
Sifting
Combined type
198524, 198573, 198577, 209238, 209241, 209247, 209288, 209307, 209364, 209390, 209393, 209400, 209406, 209420, 241 74, 241 79003, B07B 1500, B07B 122, B07B 146, B07B 158
Patent
active
052480429
ABSTRACT:
A mobile screening apparatus includes a horizontal rotary drum preferably fed by underflow from a prescreening device that is reversible endless belt of screening grizzly bars. The belt reverses for expelling oversize material caught between bars. Force needed to turn the drum is monitored, as a way of controlling drum feeding by the prescreening device, for preventing protracted over-filling of the drum. The screening drum includes an outer peripheral cage of longitudinal bars, at least some of which preferably are movably mounted. A set of wires is circumferentially wrapped about the bar cage, with sufficient flexibility to permit the wires to locally elastically flex away from the bars sufficient to pass slightly oversize material and facilitate cleaning of debris lodged in spaces among the bars and wires. Brushes help dislodge lodged debris. Slanted baffles within the cage propel the processing stream of land-clearing material such as mixed dirt, stones and roots that is being screened, towards an outlet end of the drum. Underflow from the screen is conveyed by a slewable conveyor into cone-shaped piles, possibly after fertilizer or other additives are metered into the product. The apparatus can be tended by a single operator, who may use a front-end loader or similar device for dumping raw material onto the prescreening grizzly bars. Preferably, an on-board internal combustion engine powers hydraulic motors which operate the apparatus elements. Engine exhaust can be piped into the drum for heating the material being screened.
REFERENCES:
patent: 65716 (1867-06-01), Alexander
patent: 447162 (1891-02-01), Prescott et al.
patent: 530086 (1894-12-01), Butler et al.
patent: 1081969 (1913-12-01), Ladd et al.
patent: 1321773 (1919-11-01), Ross
patent: 1370620 (1921-03-01), Willson
patent: 1420685 (1922-06-01), Burch
patent: 1458299 (1923-06-01), Jacquelin
patent: 1786131 (1930-12-01), Schulze
patent: 2516963 (1950-08-01), Derbenwick et al.
patent: 2620064 (1952-12-01), Thys
patent: 2904847 (1959-09-01), Burns
patent: 2983379 (1961-05-01), Cram
patent: 3942625 (1976-03-01), Snead
patent: 4236999 (1980-12-01), Burgess et al.
patent: 4278543 (1981-07-01), Maniquis
patent: 4440635 (1984-04-01), Reiniger
patent: 4587745 (1986-05-01), Tanner
patent: 4635860 (1987-01-01), Kruyer
patent: 4687105 (1987-08-01), Edholm et al.
patent: 4896835 (1990-01-01), Fahrenholz
patent: 4933073 (1990-06-01), Jonkers et al.
Finnish Patent Application No. 891565, no date.
Chevalier Vernon F.
Hajec Donald T.
Rissanen Ossi
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