Method for forming an annular groove in a thermoplastic pipe

Details Method for forming an annular groove in a thermoplastic pipe Method for forming an annular groove in a thermoplastic pipe

1976-03-12

1978-08-15

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 94, 264296, 264322, 4253871, 425393, 425DIG218, B29C 1702

Patent

active

041072499

ABSTRACT:
An annular groove is formed in the periphery of thermoplastic pipe near an end thereof by combining the forces of a fluid under pressure and a rigid expandable core mold. A pipe is heated, softened and placed over a core mold having an extensible portion. The extensible portion is in the retracted state initially and presents no obstacle to the placement of the pipe on the core mold. A space is provided internally of the pipe and is sealed by parts of the core mold whereby the application of a fluid pressure pushes outwardly on the inner periphery of the pipe. At the same time or subsequently the extensible portion of the core mold is extended to provide additional pressure to and to shape the latter internal periphery of the pipe.

REFERENCES:
patent: 2977633 (1961-04-01), Breitenstein
patent: 3271489 (1966-09-01), Fogelberg
patent: 3272896 (1966-09-01), Winchester
patent: 3278665 (1966-10-01), Harrison
patent: 3706519 (1972-12-01), Soethje
patent: 3773456 (1973-11-01), Salz
patent: 3823216 (1974-07-01), Petzekais
patent: 3825392 (1974-07-01), Ligon
patent: 3861847 (1975-01-01), Barnett
patent: 3940227 (1976-02-01), Strasser
patent: 3960472 (1976-06-01), O'Connor
patent: 3989439 (1976-11-01), Schmitzberger
patent: 3991150 (1976-11-01), Putter

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