Method and device for forming an internal annular groove in a pl

Details Method and device for forming an internal annular groove in a pl Method and device for forming an internal annular groove in a pl

1981-03-27

1983-07-26

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

264296, 425DIG218, B29C 1707

Patent

active

043953794

ABSTRACT:
A socket of a thermoplastic pipe is provided with an internal groove by subjecting the tube to an upsetting action and simultaneously inflating the tube by an inner pressure. Subsequently a moulding ring is expanded and the tube is shrunk onto the expanded ring by cooling. Before shrinkage the inner diameter of the bottom of the groove is at least equal and preferably greater than the outer diameter of the moulding ring in expanded form.

REFERENCES:
patent: 2365637 (1944-12-01), Helwig
patent: 3425093 (1969-02-01), Ansette
patent: 3484900 (1969-12-01), Sands
patent: 3823216 (1974-07-01), Petzetokis
patent: 3899565 (1975-08-01), de Putter
patent: 3989439 (1976-11-01), Schmitzberger
patent: 4105087 (1979-04-01), de Putter
patent: 4107249 (1978-08-01), Muroi
patent: 4170448 (1979-10-01), French

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