Method for removing certain of the corrugations in a helically corrugated pipe
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United States of America Patent
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Jun 21, 1988
Issued Date -
N/A
app pub date -
Jan 28, 1987
filing date -
May 9, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Corrugations are removed from the end of a helically corrugated pipe by compressing the end of the pipe between a plurality of radially movable die segments. By choosing appropriately-shaped die segments and die-actuating cams, the end of the pipe can be expanded, or shrunk to a diameter less than that of an imaginary cylinder defined by a surface of revolution contacting the innermost surfaces of the pipe. Products manufactured in accordance with the method of the invention have an end portion with an accurately controlled diameter; a minimum of pipe length is taken up by the modification.
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