Method for forming inline triple wall coupling connector
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United States of America Patent
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Jun 15, 2021
Grant Date -
Nov 9, 2017
app pub date -
Nov 27, 2015
filing date -
Nov 28, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A pipe coupling for triple wall corrugated plastic pipe includes a triple wall corrugated bellmouth connector that is of a unitary construction with one end of the corrugated plastic pipe. This bellmouth connector is of higher strength and in cooperation with the two wall corrugated spigot provides a high strength coupling. This coupling includes the bellmouth connector and spigot that are made inline with the corrugated pipe. A method for the manufacture of the pipe includes controlling of an air pressure on the outside of a formed two wall corrugated pipe as an exterior third wall is secured thereto.
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