Molding apparatus for articles having internal undercuts

Details Molding apparatus for articles having internal undercuts Molding apparatus for articles having internal undercuts

1993-07-21

1995-10-10

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

425577, 425443, 425444, 425DIG58, 249 60, 249 64, 249178, B29C 4544

Patent

active

054565936

ABSTRACT:
An injection molding apparatus is disclosed for forming articles with internal undercuts by the use of lifter heads with transversely extending protrusions. The lifter heads are received in recesses in the mold projections which form the interior of the molded article. The transverse protrusions of the lifter heads extend into the voids surrounding the projections to form the undercuts. The lifter heads are extended outwardly from the projections to remove the article from the mold. Ejector pins move the molded article outwardly from the lifter heads. The lifter head protrusions have inward ramping surfaces which facilitate the removal of the molded article. A lifter head may include two, angularly offset protrusions which form two undercuts near the corner between intersecting internal walls of the molded article. The protrusions have beveled release surfaces which allow the molded article to shift transversely off the lifter heads.

REFERENCES:
patent: 3060509 (1962-10-01), McCubbins, Jr.
patent: 3197825 (1965-08-01), Hammond
patent: 3341897 (1967-09-01), Susuki et al.
patent: 3381068 (1968-04-01), Leiper et al.
patent: 3642417 (1972-02-01), Von Holdt
patent: 3649728 (1972-03-01), Honsho et al.
patent: 3669598 (1972-06-01), Tucker
patent: 3687591 (1972-08-01), Perego
patent: 3798299 (1974-03-01), Gumm et al.
patent: 3816047 (1974-06-01), Mohler
patent: 4101256 (1978-07-01), White et al.
patent: 4104606 (1992-04-01), Donoghue
patent: 4278417 (1981-07-01), Wilds et al.
patent: 4342549 (1982-08-01), Lemelson
patent: 4353522 (1982-10-01), Anger
patent: 4383670 (1983-05-01), Olschewski et al.
patent: 4452420 (1984-06-01), Lundquist
patent: 4576568 (1986-03-01), Grannen, III
patent: 4729863 (1988-03-01), Muller et al.
patent: 4820149 (1989-04-01), Hatakeyama et al.
patent: 4832307 (1989-05-01), Watanabe et al.
patent: 4861257 (1989-08-01), Siotani
patent: 4872637 (1989-10-01), Vankens
patent: 4986942 (1991-01-01), Irgens
patent: 4997356 (1991-03-01), Katagiri
patent: 4998874 (1991-03-01), Stocchiero
patent: 5137442 (1992-08-01), Starkey
patent: 5281127 (1994-01-01), Ramsey
patent: 5368467 (1994-11-01), Kleyn
D & L Progressive Components, UniLifter brochure (date unknown).
PCS Company, E-Z Lifter brochure (date unknown).

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