Appeal No. 97-2642 Page 7
Application No. 08/094,461
Raymond discloses a method and apparatus for heating a
screed. The general layout of an asphalt paving machine with
a floating main screed equipped with adjustable screed
extenders which is towed by a tractor is shown in Figure 4.
As shown in Figures 2 and 3, the main screed unit of Raymond
has a sole plate 16 and a pair of side-by-side frame sections
10, 11 each comprising an outer generally triangular side
plate 12, an inner gusset plate 13, a deck plate 14, and a
front moldboard 15. As shown in Figures 1 and 2, the screed
unit is towed from a tractor by a pair of laterally spaced
drag arms 29 of general L-shape which are pivotally connected
to the tractor adjacent their forward ends and are pivotally
connected to the screed unit by pins 30 extending through the
side plates 12 and a pair of upstanding lever arms 31 which
are welded at their lower ends to the deck plates 14. Jack
screws 32 with universals 32a and operating handles 32b
connect the upper ends of the lever arms 31 to the drag arms
29 so that the lever arms can be pulled forwardly or pushed
rearwardly relative to the drag arms 29 to thereby adjust the
plane of the sole plate 16 relative to the ground surface to
vary the vertical attack angle of the screed. Raymond
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Last modified: November 3, 2007