Method and apparatus for shaping a normally rigid plastic pipe

Details Method and apparatus for shaping a normally rigid plastic pipe Method and apparatus for shaping a normally rigid plastic pipe

1975-01-31

1976-10-19

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Rod or tubular preform

264296, 264213, 425403, 425DIG218, B29C 112

Patent

active

039868109

ABSTRACT:
A normally rigid plastic pipe is shaped by softening a selected zone of the pipe, inserting into the softened zone a resiliently deformable mandrel and pressing axially on opposite sides of the mandrel. This expands the mandrel radially into frictional engagement with the softened pipe zone. Contemporaneously the mandrel is shortened axially, thereby correspondingly expanding radially and shortening axially the softened portion of the pipe while proportionately thickening its side walls.

REFERENCES:
patent: 3432887 (1969-03-01), Poux et al.
patent: 3823216 (1974-07-01), Petzetakis

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