Method for casting a bidirectional foam pig

Details Method for casting a bidirectional foam pig Method for casting a bidirectional foam pig

1997-01-21

1999-04-20

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Dividing work to form plural articles

264261, 264267, 264279, 264313, 249 83, 249155, 425127, B29C 3910, B29C 3912

Patent

active

058956190

ABSTRACT:
The present disclosure sets forth both a method and apparatus for molding a unitary pig formed of two types of material, one being a light weight foam, and the other being a harder polymeric material thereby yielding a unitary harder material in the cast pig. The finished product involves N discs having parallel end faces and a central drilled core; the unitary cast harder material defines end located discs located adjacent to said foam core and a central core therein so that the end located discs adjacent to the foam donut are unitary with the core and bonded thereto.

REFERENCES:
patent: 2369067 (1945-02-01), Mayer
patent: 3725968 (1973-04-01), Knapp et al.
patent: 3875606 (1975-04-01), Landers
patent: 3879790 (1975-04-01), Girard
patent: 4083076 (1978-04-01), Girard
patent: 4525133 (1985-06-01), Bergmann
patent: 4714576 (1987-12-01), Cotton et al.
patent: 5533224 (1996-07-01), Knapp
patent: 5625917 (1997-05-01), Hawkins

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