Plastic article or earthenware shaping or treating: apparatus – Sets of shaping couples comprising an endless surface for... – Corrugating means for running length work
Reexamination Certificate
2007-05-08
2007-05-08
Gupta, Yogendra N. (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Sets of shaping couples comprising an endless surface for...
Corrugating means for running length work
C425S325000, C425S326100, C425S380000, C425S387100, C425S396000, C425S133100
Reexamination Certificate
active
11257996
ABSTRACT:
A device for manufacturing a double-walled thermoplastic pipe with a connecting sleeve has a molding tunnel with a succession of molds for forming a corrugated molding wall and a connecting sleeve, respectively. An extrusion device extrudes a first flexible tube into said molding tunnel and a second flexible tube into said first flexible tube. A first gas channel is arranged for generating a pressure between said first and second flexible tubes. A compressed-gas control device is connected to said first gas channel for generating a pressure p1or a pressure p2in said space between said first and second flexible tubes by compressed air emerging from said first gas channel. A second compressed-gas control device is connected to a second gas channel for guiding compressed gas onto an inner side of said second flexible tube. Said first pressure controller is connected to said first gas channel via a compressed-gas line that is connected to an additional compressed-gas reservoir for gas exchange therewith.
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Lupke Manfred Arno Alfred
Lupke Stefan A.
Cahn & Samuels LLP
Ewald Maria Veronica
Gupta Yogendra N.
Lupke Manfred A.A.
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