Appeal No. 2002-0174 Page 2
Application No. 09/190,373
1. A pressure roller in combination with a heating
element for a welding apparatus for running longitudinally
along an area of overlapment between an underlying first
thermoplastic sheet having an upper surface and being
supported by a deck of a roof structure, said first
thermoplastic sheet being secured to said deck by a line of
fastening means adjacent to and parallel with an edge
thereof, and an overlapping second thermoplastic sheet
having a lower surface which is disposed over said line of
fastening means and in an overlapping registry with a
portion of said first thermoplastic sheet, said pressure
roller being made of stainless steel and being integral with
a stainless steel axle designed to be connected to a driving
means at one end thereof and comprising at the other end of
said axle: a distal end, a proximal end and a center portion
which defines a groove between the distal proximal ends,
said groove carrying an elastomeric cushion designed to ride
over said line of fastening means said elastomeric cushion
selected from the group consisting of;
natural rubber;
acrylate-butadiene rubber;
cis-polybutadiene;
chlorobutyl rubber;
chorinated polyethylene elastomers;
polyalkylene oxide polymers;
ethylene vinyl acetate;
hexafluoropropylene-vinylidene fluoride-
tetrafluoroethylene terpolymers;
butyl rubbers;
polyisobutene;
synthetic polyisoprene rubber;
styrene-butadiene rubbers;
tetrafluoroethylene propylene copolymers; and
thermoplastic-copolyesters,
said elastomeric cushion having a durometer from 41 to
80 Shore A;
said heating element positioned between the upper
surface of said first thermoplastic sheet and the lower
surface of said second thermoplastic sheet and above
said line of fastening means having a blower therein
and a nozzle having an outlet therein with three
portions, two of which are large openings to allow
delivery of the major portion of heated air produced by
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Last modified: November 3, 2007