| 摘要 |
A method of removing a hollow article having peripherally spaced internal enlargements from an injection mold assembly by first drawing a portion of the mold core intermediate the enlargements rearwardly such that the end of this portion is substantially clear of the enlargements and then rotating the article and the enlargement defining portion of the core with respect to each other to substantially release the article from contact with the enlargement defining core portion. The apparatus includes a special core assembly comprising a shank member having an end portion with peripherally spaced molding depressions in its outer surface for forming the enlargements, a clearance member which is slidable along the shank member to create a clearance for the internal enlargements of either the part or the molding depressions of the shank member when either of the latter is rotated with respect to the other.
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