Method of making socketed pipe-fittings of synthetic plastics ma

Details Method of making socketed pipe-fittings of synthetic plastics ma Method of making socketed pipe-fittings of synthetic plastics ma

1982-06-18

1984-01-31

Hoag, Willard E.

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

29235, 29451, 2642711, 264318, 264336, 264339, 264342R, 264348, 4253241, 425383, 425397, 425404, 425412, 425436R, B29C 114, B29C 2700, B29D 2302, B29F 100

Patent

active

044288999

ABSTRACT:
Method and apparatus of making socketed pipe-fittings of synthetic plastics material by injection moulding. Prior to starting the injection moulding process a sealing ring is held in somewhat pinched condition with reduced outer diameter at the level of means to be formed on the socket for receiving the sealing ring. During the injection moulding process the sealing ring is held in this condition and is isolated from the moulding cavity. After sufficient, but incomplete cooling of the socket formed, the sealing ring receiving means are partially and temporarily deformed, and the sealing ring is released to enable it to spring into the partially deformed ring receiving means. Thereafter the ring receiving means reassume their original form, thereby firmly gripping the sealing ring.

REFERENCES:
patent: 3081102 (1963-03-01), Murray et al.
patent: 3520047 (1970-07-01), Muhlner et al.
patent: 3776682 (1973-12-01), Parmann
patent: 3807027 (1974-04-01), Heisler
patent: 3836622 (1974-09-01), Sporre
patent: 3887674 (1975-06-01), Oostenbrink
patent: 3887992 (1975-06-01), Parmann
patent: 3960472 (1976-06-01), O'Connor et al.
patent: 4170448 (1979-10-01), French

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