Method for manufacturing a sealing body for a pipe joint

Details Method for manufacturing a sealing body for a pipe joint Method for manufacturing a sealing body for a pipe joint

1986-01-14

1988-05-10

Silbaugh, Jan 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, 264334, 425556, B29C 4544, B28B 710

Patent

active

047434228

ABSTRACT:
A method of manufacture of a sealing body for a pipe joint comprising a retaining ring of thermoplastic material, which is to be fastened on the end portion of a pipe part, and a sealing ring of thermoplastic material, preferably thermoplastic rubber, bonded to the retaining ring. The retaining ring is first moulded by injection moulding and then the sealing ring is moulded by injection molding in a second mould cavity which is partly bonded by a portion of the retaining ring. The first mould cavity is bounded by two mould cavity surfaces movable relative to one another. When the first mould cavity is opened, the retaining ring remains on one mould cavity surface and is subsequently placed back against the other mould cavity surface. During injection moulding of the sealing ring the mould cavity may be sealed at the transitions from the surface portion of the retaining ring to the adjoining mould cavity surfaces by an annular lip and an annular ridge respectively. A sealing ring and a following retaining ring may be moulded practically simultaneously in first and second mould cavities spaced apart in one and the same mould.

REFERENCES:
patent: 2955371 (1960-10-01), Brunner
patent: 3475530 (1969-10-01), Cooper
patent: 4348348 (1982-09-01), Bennett
patent: 4410479 (1983-10-01), Cyriax
patent: 4468367 (1984-09-01), Beune et al.
patent: 4507258 (1985-03-01), Aoki

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