Classifying – separating – and assorting solids – Sifting – Combined type
Patent
1981-02-19
1982-09-28
Hill, Ralph J.
Classifying, separating, and assorting solids
Sifting
Combined type
209244, 209267, 209315, 209365C, 209366, 209397, B07B 128, B07B 900
Patent
active
043517196
ABSTRACT:
A vibratory screen apparatus is employed to continuously separate particles of random sizes, such as wood chips, into groups large, medium and small sized particles. A vibratory frame has a horizontal platform driven in vibratory movement to convey particles on the platform to one end of the platform. Upper and lower inclined screens are mounted upon the platform, particles are fed to the upper end of the upper screen which will pass medium and small sized particles passing through the lower screen to the platform. Gravitational movement of particles down the inclined upper screen is delayed by the vibratory movement of the screen; abutment surfaces on the upper surface of the upper screen imparting intermittent upward movement to particles on that surface which resists, but does not overcome gravitationally induced flow of the particles.
REFERENCES:
patent: 297382 (1884-04-01), Golding
patent: 2020013 (1935-11-01), Bailey
patent: 2297486 (1942-09-01), Linke et al.
patent: 2901111 (1959-08-01), Eppenberger
patent: 3087618 (1963-04-01), Musschoot et al.
Hill Ralph J.
Morbark Industries, Inc.
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