Method for molding an article expanded at the center portion and

Details Method for molding an article expanded at the center portion and Method for molding an article expanded at the center portion and

1977-02-18

1978-07-18

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249177, 249183, 264318, 264334, 425440, 425DIG58, B29C 112

Patent

active

041016262

ABSTRACT:
An article expanded at the center portion and having the maximum diameter at said portion, for example a ball-shaped flexible tube joint, is produced by using a mold consisting of a main mold having the same inner surface as the outer shape of said article, a cover mold provided with an elastic core having the same outer shape as the inner shape of the above described article and provided with a hollow cavity in the inside of the core, and a bottom mold provided with a projection, which detachably fits in the hollow cavity in the core, the main mold being put between the cover mold and the bottom mold, and a cavity having the same shape as the article to be molded being formed by the cover mold, the elastic core, the main mold and the bottom mold, and by pouring a liquid elastomer into the thus formed cavity and hardening said liquid elastomer.

REFERENCES:
patent: 2779676 (1957-01-01), Brownstein
patent: 3157934 (1964-11-01), Williams
patent: 3158906 (1964-12-01), Boyer
patent: 3720746 (1973-03-01), Schwenk

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