Universal internal core lifter apparatus

Details Universal internal core lifter apparatus Universal internal core lifter apparatus

1991-02-07

1992-08-11

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping surface including means to release or remove product...

By means releasing article from interiorly placed shaping...

249 661, 425441, 425444, 425556, 425577, 425DIG58, B29C 4544

Patent

active

051374420

ABSTRACT:
An internal core lifter in a mold is provided with both linear motion and pivotal seating in a universal coupling that slides linearly along an ejector plate. The pivotal seating allows the core blade to be used at various angles in different molds, thereby reducing the inventory of core blade needed. To resist high forces encountered during ejection and during the opening and closing of the mold, the preferred pivotal seating comprises wide arcuate dovetail surfaces on the lower end of the core blade and on a slidable support which has linear dovetail surfaces with the ejector plate. The upper end of the core blade may be configured to be part of the molding surfaces to mold an undercut in a plastic part. The upper end of the core blade is moved laterally from the undercut and then is shifted upwardly to engage and eject the part.

REFERENCES:
patent: 3293697 (1966-12-01), Balint
patent: 3387334 (1968-06-01), Belanger et al.
patent: 3454693 (1969-07-01), Crenshaw
patent: 4101256 (1978-07-01), White et al.
patent: 4854849 (1989-08-01), Sudo
patent: 4956142 (1990-09-01), Mangone, Jr.

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