Plastic article or earthenware shaping or treating: apparatus – Preform reshaping or resizing means: or vulcanizing means... – Rod or tubular preform
Patent
1979-03-14
1983-09-13
Derrington, James H.
Plastic article or earthenware shaping or treating: apparatus
Preform reshaping or resizing means: or vulcanizing means...
Rod or tubular preform
425DIG218, B29C 112
Patent
active
044039387
ABSTRACT:
To ensure that a socket formed on a pipe-end in plastically deformable condition is in no part thinner than the pipe material out of which it is made, the pipe-end is first enlarged in diameter and encased within a contour die formed as envelope for the external shape required of the socket. The enlarged pipe-end is then longitudinally compressed to thicken it and internally formed so as to smooth the internal surface of the pipe-end and impose on it the internal shape and dimensions required of the socket. The required socket shape preferably includes a circumferential groove to house a resilient sealing ring.
REFERENCES:
patent: 3728059 (1973-04-01), Putter
patent: 3852016 (1974-12-01), Delauzun
patent: 3861847 (1975-01-01), Barnett
patent: 4065243 (1977-12-01), Acda
patent: 4107249 (1978-08-01), Murai
patent: 4157372 (1979-06-01), Kyomen
patent: 4170448 (1979-10-01), French
Cohen Solomon E.
Muller Hans
Seach Barry G.
Derrington James H.
James Hardie & Coy. Pty. Limited
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