Classifying – separating – and assorting solids – Sifting – Conveying
Patent
1977-02-14
1978-11-21
Halper, Robert
Classifying, separating, and assorting solids
Sifting
Conveying
209379, 209333, B07B 128
Patent
active
041265432
ABSTRACT:
A method and apparatus for use in separating oversize from on size particles in a mass of particulate materials passed rapidly through a screening device includes a sloping screen mesh having sizing openings dimensioned to be larger than the desired maximum on size particles intended to pass through the mesh. The screen mesh is supported at a relatively steep slope angle and the cosine of the angle of the slope multiplied times the mesh opening size is set up to be substantially equal to the desired maximum on size particles to be passed through the screen mesh. A particle rebound shield is spaced closely above the upper surface of the screen mesh for reflecting and directing particles that bounce off the screen mesh back towards the openings therein. The material flow rapidly over the mesh because of the steep slope angle and the rebound shield insures that on size particles are directed toward the openings in the mesh a sufficient number of times during their travel through the apparatus to pass through the mesh.
REFERENCES:
patent: 440301 (1890-11-01), Boorman et al.
patent: 1202374 (1916-10-01), Fraser
patent: 2853191 (1958-08-01), Mogensen
patent: 3121679 (1964-02-01), Newburg
patent: 3688902 (1972-09-01), Hubach
Taggart, Arthur; Handbook of Mineral Dressing, 1945, Section 7.
American Colloid Company
Halper Robert
Hokanson Jon E.
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