Extruded pipe coupling and method and apparatus for forming

Details Extruded pipe coupling and method and apparatus for forming Extruded pipe coupling and method and apparatus for forming

1974-02-22

1976-04-06

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264150, 264318, 264322, 264331, 264345, B29C 1700, B29D 2300

Patent

active

039490459

ABSTRACT:
A plastic pipe coupling is formed by a pressing operation upon a section of extruded pipe that has been heat softened. The method of forming includes enclosure of the entire pipe section in a mold and longitudinal compression of the heat softened plastic to obtain wall thickness greater than the original extruded pipe section. The apparatus includes compressor members to shorten the heat softened extruded pipe section, a rigid external die or mold to shape the exterior, expanding mandrels made of mechanically rigid materials to accurately form the interior, and structure to accurately position the mandrels with respect to the outer mold to obtain accurate wall thickness.

REFERENCES:
patent: 3149861 (1964-09-01), Larsson
patent: 3214505 (1965-10-01), Pierkowski et al.
patent: 3264383 (1966-08-01), Niessen et al.
patent: 3432887 (1969-03-01), Poux et al.
patent: 3557278 (1971-01-01), Kuhlemann
patent: 3632732 (1972-01-01), Osterhagen et al.
patent: 3706519 (1972-12-01), Soethje
patent: 3755528 (1973-08-01), Gutlhuber

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