초록

A collapsible mold core having plural can actuated members surrounding a conical central core member, the members surrounding the central core member having slidable pins connecting adjacent members and molding apparatus including the core.

대표청구항 ▼

In molding apparatus a collapsible mold core and an outer mold half for defining a mold cavity therebetween, and means for placing molten material for molding into the mold cavity, said collapsible core defining outer core members movable between a molding position and a collapsed position to permit

In molding apparatus a collapsible mold core and an outer mold half for defining a mold cavity therebetween, and means for placing molten material for molding into the mold cavity, said collapsible core defining outer core members movable between a molding position and a collapsed position to permit removal of the object mold, container lip forming means carried in said mold including an annular member extending axially of said core for defining an annular trough in said container lip, said container lip forming means and outer core members being movable by stripper plate means while the remainder of said core member is stationary, and further including cam means actuatable as said outer core members move longitudinally and inwardly in the motion of mold collapse to force said outer core members to move forward relative to said container lip forming means as the mold is opened. A collapsible mold core for use with an outer mold half for defining a mold cavity therebetween and means for displacing molten material into the mold cavity for molding a part, said collapsible mold core comprising, in combination, central inner core means of the general shape of a truncated cone but having a plurality of substantially flat surfaces extending along the length of said inner core means in circumferentially spaced relation, a first plurality of outer core elements, one in engagement with each of said flat surfaces for longitudinal sliding movement relative to said flat surfaces, said flat surfaces being tapered relative to the longitudinal axis of said central inner core means, and a second plurality of outer core elements positioned around said central inner core means intermediate said first outer core elements and equal in number thereto, the outer surfaces of said first and second plurality of outer core elements together defining a generally cylindrical surface when in their expanded molding position, said central inner core means having arcuate surfaces intermediate said flat surfaces and said second plurality of outer core elements being in engagement with corresponding ones of said arcuate surfaces for longitudinal sliding movement relative to said arcuate surfaces, said first and second outer core elements being slidable relative to said central inner core means in one direction to form a molding configuration and in a second direction to define a collapsed configuration, said first plurality of outer core elements being interconnected with said second plurality of outer core elements by pins extending between side elements so that said second plurality of outer core elements vertically supports said first plurality of outer core elements.