Method and apparatus for the continuous manufacture of a compound pipe with a pipe socket
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United States of America Patent
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Jun 14, 1994
Grant Date -
N/A
app pub date -
Mar 9, 1993
filing date -
Mar 31, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
For the continuous manufacture of a compound pipe with a pipe socket including a smooth internal tube and an external tube provided with transverse grooves and welded together with the latter, an external tube and an internal tube are extruded, the latter into the external tube. While the normal compound pipe is manufactured, gas is blown at a slight overpressure into the space beteen the external tube and the internal tube. When the pipe socket is produced, this space is vented so that a full-surface bearing of the internal tube against the external tube is achieved, to which end the internal tube is acted upon from its inside by gas under pressure.
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