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US 4,427,360 AGranted
Apparatus for blow molding plastic articles from a parison
AssigneeKrupp Corpoplast Maschinenbau GmbH
InventorsPeter Albrecht, Wolfgang Reymann, Klaus Vogel
Life of this patent
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Abstract
In the art of blow molding thermoplastic articles a pair of blow mold halves is closed around a parison. A blowing medium is applied so that the parison is thus blown to a container configuration. In this blowing step very high closing forces are necessary to maintain the mold halves in closed position. The invention provides for a plurality of biased pistons which are actuated by a pressure medium to support the mold halves on a stationary frame.
Claims12
Apparatus for blow molding plastic containers from blowable parisons comprising:
- a stationary frame;
- a pair of mold halves (14, 16) forming a mold cavity, at least one of said mold halves being movable for placing the mold halves in a closed position and an open position, a parison being insertable in the mold cavity and subjected to a blowing medium when the mold halves are in the closed position, and a finished container being removable and a new parison being insertable when the mold halves are in the open position;
- a cylinder plate (52) on which said movable mold half (16) is mounted;
- a mold carrying member (42) coupled to said cylinder plate so as to permit movement of said cylinder plate with respect to said mold carrying member, said mold carrying member being movably mounted on said frame for moving the mold half between the open and closed positions;
- at least one piston (46-48) carried by said mold carrying member, said piston being in abutment with said frame and extending into a cylinder in said cylinder plate opposite said movable mold half;
- and
- means for applying a pressurizing medium to said cylinder between said cylinder plate and piston to apply a force to the mold halves resisting separation of the mold halves.
4 more elements
Dependencies are inferred from the claim text.