Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1979-12-12
1984-07-03
Derrington, James H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264318, 264296, B29C 700
Patent
active
044578865
ABSTRACT:
The invention relates to a process for the production of coupling pieces which possess an undercut annular groove optionally provided with a sealing ring, in which process a sleeve, having an internal diameter which increases in steps towards the open end, is initially preformed, the terminal part of the sleeve is postformed in order to form the annular groove, after having optionally introduced a sealing ring into the preformed sleeve, and, during preforming, only the terminal part of the preformed sleeve is kept at the deformation temperature and the remainder of the preformed sleeve is cooled, the terminal part of the preformed sleeve being cooled after postforming.
The device according to the invention comprises a forming mandrel, the front part of which possesses a cooling chamber and the rear part of which possesses heating means, a postforming ring, which can move radially and axially and is equipped with a cooling chamber, and optionally a moulding sheath, a closing ring, which is equipped with heating means, and a member for introducing the sealing ring, which member can move radially and axially.
REFERENCES:
patent: 4006757 (1977-02-01), Acda et al.
patent: 4113813 (1978-09-01), Wilson
patent: 4127632 (1978-11-01), Anger
Acda Petrus M.
Karreman Jacob
Derrington James H.
Polva-Nederland B.V.
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