Molding apparatus with collapsible core

Details Molding apparatus with collapsible core Molding apparatus with collapsible core

B - Operations, Transporting

29

C

18/922

B29C 33/48 (2006.01) B29C 45/00 (2006.01) B29C 45/36 (2006.01) B29C 45/44 (2006.01)

Patent

CA 1330479

Abstract of the Disclosure A collapsible core and molding apparatus and method for molding a plastic article having an undercut and a non- undercut portion. The collapsible core includes a center core pin and a core sleeve about the core pin and with the core pin having a small plurality of alternating, uniform, narrow, non- collapsing segments secured to the center pin and the same plurality of uniform, alternating, wider, arcuate, collapsing segments secured to the core sleeve, the wide collapsible seg- ments adapted to move between the non-collapsed segments to form the expanded position for a molding operation where the wide segments are separated by the narrower segments, and a collapsed position where the collapsible segments collapse radially in- ward on the axial withdrawal of the center pin to form a generally cylindrical, cross section, arcuate area and to permit the ejection of a small molded plastic article from the mold.

614842

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