Portable thermoplastic welding machine
AssigneeG.R. Systems, Inc.
InventorsPhilip A. Taylor, A. Neil Johnson
Life of this patent
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Abstract
This invention relates to portable machines for welding together individual thermoplastic sheets in situ. The machine heats different and opposing thermoplastic sheets using independently controlled electric, radiant heat sources and then compresses the sheets beneath an endless compression belt to complete the weld thus forming a unitary membrane.
Claims4
In an improved portable thermoplastic sheet welding machine in which opposing thermoplastic sheets, an upper strip and lower sheets, are welding together to make a unitary membrane, the machine having heat source means to heat the opposing thermoplastic sheets and compression means to compress the heated portions into a weld, an improved heat source means wherein the improvement comprises:
- (a) a first, radiant, electric heat source directed at the thermoplastic surface of an upper strip of thermoplastic sheet and substantially dedicated to that material;
- (b) a second, radiant, electric heat source directed at the opposing sheets and substantially dedicated to that material;
- and
- (c) electric control means for independently controlling the temperatures of the first and second radiant heat sources to permit them to operate at different temperatures.
Dependencies are inferred from the claim text.