Appeal No. 97-2642 Page 8
Application No. 08/094,461
provides adjustment for raising or lowering the center of the
sole plate 16 relative to the lateral sides so that the sole
plate can be dished upwardly to conform with a crown in the
road, or can be dished downwardly to provide a valley to serve
as drain area for a parking lot. As shown in Figures 3 and 5,
the sole plate 16 of the main screed is provided with two sets
of heat exchange tubes 46, one for each half, covered with
insulating blankets 47. The tubes 46 are rectangular in
cross-section so as to rest flat against the upper face of the
sole plate. The heat exchange tubes on each half of the sole
plate 16 form a respective serpentine path having straight
parallel sections 46a extending lengthwise of the screed which
are joined by curved end sections 46b. As shown in Figure 6,
each sole plate extension screed 16a is provided with loops of
tubing 46c, 46d interconnected by a flexible hose 46e which
loops horizontally around the hinge assembly of the extension
screeds. As shown in Figure 7, one of the loops 46c, 46d is
connected by a flexible supply hose 48 to one end of the heat
exchange tubing on the adjoining half of the main screed, and
the other end is connected by a flexible return hose 49 to a
reservoir 50. As shown in Figure 7, the tractor for an
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Last modified: November 3, 2007