Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – Including means to prepare parison
Patent
1977-12-06
1978-07-11
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
Including means to prepare parison
425535, 425DIG218, B29D 2303
Patent
active
041003071
ABSTRACT:
A resin pipe joint is formed having a groove on the internal surface thereof adapted for receiving a seal. The mold for forming the pipe joint includes an external split mold and an internal mold core and sleeve with parts slidable relative to one another so that the elements form a space therebetween for injecting resin therein. Subsequently, while the injected resin is still in an unhardened state, the movable parts are moved to a second position relative to one another thereby providing an annular opening surrounding the resin body formed during the resin injecting step. A pressurized fluid is jetted through a passageway towards the internal periphery of the resin body to cause said resin body to bulge into the annular space thereby creating the internal groove or exteranl bulge in the resin body.
REFERENCES:
patent: 688924 (1901-12-01), Blair et al.
patent: 2469130 (1949-05-01), Rodman, Jr.
patent: 3809517 (1974-05-01), Schneider
patent: 3982871 (1976-09-01), Moddel
Lazarus Richard B.
Sekisui Kagaku Kogyo Kabushiki Kaisha
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