Appeal No. 98-1207 Page 11
Application No. 08/420,648
As shown in Figures 2-4 of Bishop, conveyor 16 lifts the
raw material upward and to the rear of the machine. At the
after end of conveyor 16, the raw material is gravity
transferred to grizzly bars 46 (a multiple tined fork
arrangement) used to provide a first very course screening of
the raw material to remove larger rock size portions. The
coarsest material 48 rolls
off the rear of grizzly 46 and is fed by gravity to conveyor
belt 50. Coarse screen 18 and fine screen 20 are located just
below grizzly 46. Collector plate 22 is located just below
fine screen 20. Screens 18 and 20 and collector plate 22 are
assembled as a unit. An eccentric weight 24 is rotatably
mounted below and connected to collector plate 22 to impart a
shaking motion to the unit comprising screens 18 and 20 and
collector plate 22. Thus, materials which are small enough to
pass through the bars of grizzly 46 fall on screen 18. The
shaking motion of eccentric weight 24 urges these materials to
flow downward, either toward the front of the machine over the
top of screen 18, or through the coarse screen 18 to finer
screen 20. The larger particles 36 flow to the forward end of
screen 18 and drop off onto the ground as shown. The finer
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Last modified: November 3, 2007