Process for the forming of coupling pieces from a thermoplastic

Details Process for the forming of coupling pieces from a thermoplastic Process for the forming of coupling pieces from a thermoplastic

1979-12-12

1983-07-19

Derrington, James H.

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

264318, B29C 700

Patent

active

043943438

ABSTRACT:
Process and device for the forming, on the end of a pipe made of a thermoplastic, of a coupling piece possessing an undercut annular groove intended for receiving an annular seal, according to which process and device the coupling piece is initially preformed by means of a forming core which possesses an annular rib for forming the annular groove, the core then being withdrawn from the partially cooled coupling piece by virtue of an elastic deformation of the part possessing the groove, by means of the rib of the forming core, and this part being kept at the elastic deformation temperature, and according to which this part is subjected to a postforming operation, before it has completely cooled, by means of a postforming ring.

REFERENCES:
patent: 4006757 (1977-02-01), Acda et al.
patent: 4113813 (1978-09-01), Wilson
patent: 4127632 (1978-11-01), Anger

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