Mold and molding process

Details Mold and molding process Mold and molding process

2004-09-24

2009-08-18

Daniels, Matthew J. (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

C264S036170, C264S635000, C425S468000, C425S469000

Reexamination Certificate

active

07575706

ABSTRACT:
A method and apparatus for forming a member, such as a column. The invention comprises inner and outer molds that are spaced apart forming a cavity for receiving a viscous material for making the member. A core is inserted within the inner area of inner mold when the viscous material is initially disposed within the mold. Once the material attains a gelled state, an extraction member is inserted within the inner area. A vacuum is applied to the inner area that causes the flexible inner mold to separate from the material and conform to the extraction member allowing for removal.

REFERENCES:
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patent: 925009 (1909-06-01), Millam
patent: 3104441 (1963-09-01), Smith
patent: 3290728 (1966-12-01), Pratt
patent: 3550897 (1970-12-01), Herro
patent: 3768769 (1973-10-01), Sachs
patent: 3891022 (1975-06-01), Cola
patent: 3896206 (1975-07-01), Beaver et al.
patent: 3980269 (1976-09-01), Maurino et al.
patent: 4169174 (1979-09-01), Bixby

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