Bar screen having a reciprocating action
AssigneeWeyerhaeuser Company
InventorGevan R. Marrs
Life of this patent
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Abstract
A bar screen (10) for sizing wood chips which includes a plurality of parallel bars (12--12) supported at their respective ends (14, 16) in such a manner and driven in such a manner that each bar moves both longitudinally and vertically. Two alternating sets of bars (12--12) are included, one set being 180.degree. removed in position relative to the other set. The speed and movement of the bars (12--12) is such that the wood chips are tipped up to a vertical orientation and supplied with such a momentum that the chips break contact with the bars and encounter a slot between adjacent bars in their thickness dimension.
Claims9
A bar screen adapted to separate wood chips in accordance with preselected dimensional criteria, comprising:
- a plurality of elongated bars, defining slots therebetween, wherein each of the bars includes a cutout portion at each end thereof and a cam element positioned in each cutout portion and wherein the width of the slots is determined by the preselected dimensional criteria;
- means supporting said bars for movement thereof both longitudinally and vertically, including a camshaft which extends through the cam elements in each of the bars;
- means for driving said supporting means at such a speed and in such a manner that the horizontal and vertical movement of the bars imparts sufficient momentum to the chips that substantially all the chips tend to a vertical orientation and encounter a slot between two adjacent bars in their thickness dimension, said driving means including a motor for rotating the camshafts, wherein rotation of the camshafts results in movement, both horizontal and vertical, of the bars, the bars being furthermore so supported that the respective ends of each bar move in unison during movement thereof.
Dependencies are inferred from the claim text.