Method of molding a member having undercut portions

Details Method of molding a member having undercut portions Method of molding a member having undercut portions

1985-09-05

1987-09-22

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249178, 425441, 425DIG58, B29C 3344, B29C 4544

Patent

active

046954210

ABSTRACT:
This specification discloses a method of molding an article having undercut portions by the use of a plurality of divided cores or core sections combined together to form a unitary mold and having therein through-holes every other of which is different in shape, each of the through-holes having an angle of inclination with respect to a predetermined axis. The method includes the steps of disposing the divided cores on a reference plate to form a divided mold and inserting moving pins into the through-holes, pouring a material between a fixed mold and the divided mold and molding a molded article, and moving the pins inserted in the through-holes of the divided cores constituting the divided mold in the direction of the predetermined axis, whereby of the divided cores, one group of cores having the through-holes of the same shape is first separated from the molded article, and then the other group of cores is separated from the molded article. The specification also discloses an apparatus for carrying out such method.

REFERENCES:
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patent: 2948031 (1960-08-01), Webb
patent: 3373460 (1968-03-01), Ladney, Jr.
patent: 3431967 (1969-03-01), Hipp, Jr.
patent: 3655323 (1972-04-01), Hall
patent: 4005101 (1977-01-01), Ruch
patent: 4019711 (1977-04-01), Altenhof et al.
patent: 4115505 (1978-09-01), Metabi
patent: 4130264 (1978-12-01), Schroer
patent: 4362291 (1982-12-01), Fuke et al.
patent: 4533123 (1985-08-01), Von Holdt
patent: 4541795 (1985-09-01), Cole

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