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US 4,052,137 AGranted
Core molding machine
AssigneeKohler General Corporation
InventorJurgen R. Pietzner
Life of this patent
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AssigneeKohler General Corporation
InventorJurgen R. Pietzner
Estimating the term…
Each mold in a battery of molds consists of a female die which has a cylindrical mold cavity which is open on both ends. A coaxial end probe or plug is slidable into and out of one end of the cavity and has a duct therein through which plastic material is injected into the cavity. A coaxial center probe or plug is slidable into and out of the other end of the cavity and has a duct therein through which steam is injected into the cavity to heat the plastic therein. A coaxial crush probe or plug with a bore through which the center probe is slidable is itself slidable toward and away from the end of the cavity adjacent the center probe and closes that end of the cavity. A small vent gap is held open between the female die and the crush probe while the plastic beads are being injected into the cavity to allow air to escape from the cavity. The vent gap is closed after the cavity has been filled with plastic beads. After the steam has been applied to the center probe and the exterior of the female die to heat the plastic beads in the cavity, cool water is applied thereto to cool the molded article, which is substantially ejected from the cavity by the end probe.
Core molding apparatus comprising a female die having a mold cavity therein which has two open portions positioned opposite each other, an end probe movably mounted adjacent to one open portion and movable into and out of said cavity through said open portion, the portion of said end probe which enters said cavity comprising a core end boundary surface, said end probe having a duct therein which communicates into said cavity when said end probe is within said cavity, means operable to move said end probe into and out of said cavity, means operable to feed plastic material into said duct when said end probe is within said cavity to fill said cavity with plastic material, a center probe movably mounted adjacent to the other open portion of said cavity and movable into and out of said cavity through said other open portion far enough to abut against the innermost end of said end probe, the portion of said center probe which enters said cavity comprising a core boundary surface, the end of said center probe comprising a plug coacting with the open end of said duct in said end probe to thereby close said open end, and means operable to move said center probe into and out of said other open portion of said cavity.
Core molding apparatus comprising a plurality of coaxially related mold components, means operable to cause relative movement of said components on said axis, said components comprising a female die having a core cavity and core boundary wall about said cavity, a center probe telescopically receivable in said cavity and having a core boundary wall coaxial with the core boundary wall of the female die, movable opposite end probes with end faces forming core boundary walls, one of said end probes having internal duct means connectable to means operable to feed plastic material to said cavity through said duct, the end of said center probe comprising a plug coacting with the open end of said duct in said one end probe to thereby close said open end, the other end probe comprising gate means to vent said cavity during the feeding of plastic material to the cavity through said internal duct.
Dependencies are inferred from the claim text.