Stack mold with insulated runner
AssigneeHusky Injection Molding Systems Ltd.
InventorsRobert D. Schad, Vitaly Akselrud, John DiSimone
Life of this patent
Estimating the term…
Abstract
A stack mold apparatus for forming plastic articles is described. The apparatus includes an insulated runner system for delivering molten plastic material to the mold spaces for forming the parts. The apparatus further includes a mechanism for ejecting the solidified material of the runner when it becomes necessary to change the plastic material being used. In a first embodiment, the ejector mechanism has a pair of movable plates that form part of the central mold portion of the stack mold. In a second embodiment, the ejector mechanism has a movable plate, forming half of the central mold portion, having sucker pins and ejector bars incorporated therein.
Claims15
An injection molding apparatus for forming plastic articles, said apparatus comprising:
- a first mold portion, a second mold portion and a third mold portion intermediate said first and second mold portions;
- said first, second and third mold portions being relatively movable along a first axis between mold open and mold closed positions;
- said first mold portion having a first mold plate;
- said second mold portion having a second mold plate;
- said third mold portion having third and fourth mold plates;
- said first and third mold plates defining at least one mold space and said second and fourth mold plates defining at least one other mold space;
- means for supplying molten plastic material to said mold spaces;
- said plastic material supplying means including an insulated mold runner system which allows molten plastic material within said runner system to remain molten between molding cycles;
- and
- means for ejecting said runner system in a direction substantially parallel to said first axis.
An injection molding apparatus for forming plastic articles, said apparatus comprising:
- a first mold portion, a second mold portion and a third mold portion intermediate said first and second mold portions;
- said first, second and third mold portions being relatively movable along a first axis between mold open and mold closed positions;
- said first mold portion having a first mold plate;
- said second mold portion having a second mold plate;
- said third mold portion having third and fourth mold plates;
- said first and third mold plates defining at least one mold space and said second and fourth mold plates defining at least one other mold space;
- means for supplying molten plastic material to said mold spaces;
- said plastic material supplying means including a runner system;
- means for ejecting said runner system in a direction substantially parallel to said first axis;
- said third mold portion further having at least one central plate and two spaced apart ejector plates movable relative to said at least one central plate;
- and
- said ejecting means comprising piston-cylinder means for moving said ejector plates relative to said at least one central plate so as to eject said runner system.
An injection molding apparatus for forming plastic articles, said apparatus comprising:
- a first mold portion, a second mold portion and a third mold portion intermediate said first and second mold portion;
- said first, second and third mold portions being relatively movable along a first axis between mold open and mold closed positions;
- said first mold portion having a first mold plate;
- said second mold portion having a second mold plate;
- said third mold portion having third and fourth mold plates;
- said first and third plates defining at least one mold space and said second and fourth mold plates defining at least one other mold space;
- means for supplying molten plastic material to said mold spaces;
- said plastic material supplying means including a runner system;
- means for ejecting said runner system in a direction substantially parallel to said first axis;
- said third mold portion including first and second central plates movable relative to each other;
- said runner system comprising passageways cut into said plates;
- means for latching said two central plates together during molding of said plastic articles;
- and
- means for latching said first central plate to one of said first and second plates so as to move said first central plate relative to said second central plate.
Dependencies are inferred from the claim text.