Dual parison stacked clamp blow molding apparatus
AssigneeWilmington Machinery, Inc.
InventorsJohn W. Mills, John F. Allred, Jr.
Life of this patent
Estimating the term…
Abstract
A blow molding apparatus including a clamp for clamping two molds in back-to-back relationship, the clamp having first and second movable, inner platens supporting interior sections of two molds; first and second movable outer platens supporting exterior mold sections facing the interior sections; a positioner to move the inner and outer platens between opened and closed positions; an extrusion means to extrude parisons between mold sections, injectors to inject air into the interior of the parisons; and a platen retainer to resiliently position the inner platens between the outer platens to equalize pressure in the two molds.
Claims14
A clamp for clamping two molds in back-to-back alignment in a blow molding apparatus comprising:
- (a) first and second movable, inner platens having outwardly facing, mold section supporting surfaces;
- (b) first and second movable outer platens having mold section supporting surfaces facing the mold section supporting surfaces of said first and second inner platens;
- (c) a platen positioner for moving said inner platens outwardly while moving said outer platens inwardly;
- and
- (d) a platen retainer for resiliently positioning said first and second movable inner platens.
A clamp for clamping two mold sections in back-to-back alignment in a blow mold comprising:
- (a) a support frame including first and second spaced bolsters, and a platen support extending between said bolsters;
- (b) first and second movable, inner platens positioned on said platen support;
- (c) a first movable outer platen positioned on said platen support between said first bolster and said first inner platen;
- (d) a second movable outer platen positioned on said platen support between said second bolster and said second inner platen;
- and
- (e) a platen positioner including a first segment for moving said outer platens and a second segment for moving said inner platens, said segments being connected, whereby movement of said first segment to move said outer platens inwardly causes movement of said second segment to move said inner platens outwardly.
A blow molding apparatus for simultaneously blow molding hollow bodies in two molds held in fixed, back-to-back configuration comprising:
- (a) first and second movable, inner platens having outwardly facing, mold section supporting surfaces;
- (b) first and second movable outer platens having mold section supporting surfaces facing the mold section supporting surfaces of said first and second inner platens;
- (c) a platen positioner to move said platen between open and closed positions including a first segment for moving said outer platens and a second segment for moving said inner platens, said segments being connected, whereby movement of said first segment to move said outer platens inwardly causes movement of said second segment to move said inner platens outwardly;
- and
- (d) an extruder to simultaneously extrude a first parison between said first inner platen and said first outer platen and a second parison between said second inner platen and said second outer platen when said platens are in an open position;
- and
- (e) injectors adapted to inject a gas into the interiors of said first and second parisons when said platens are in a closed position.
A continuous rotary extrusion blow molding apparatus for simultaneously blow molding hollow bodies in two molds held in back-to-back configuration comprising:
- (a) a plurality of mold clamps, each clamp having first and second movable, inner platens with outwardly facing, mold section supporting surfaces;
- first and second movable outer platens with mold section supporting surfaces facing the mold section supporting surfaces of said first and second inner platens;
- and a platen positioner to move said platens between open and closed positions, said platen positioner including a first segment for moving said outer platens and a second segment for moving said inner platens, said segments being connected, whereby movement of said first segment to move said outer platens inwardly causes movement of said second segment to move said inner platens outwardly;
- (b) an extruder to simultaneously extrude a first parison between said first inner platen and said first outer platen and a second parison between said second inner platen and said second outer platen when said platens are in an open position;
- (c) a rotatable wheel radially supporting said clamps and having means for sequentially moving said clamps past said parisons to position a first parison between said first inner platen and said first outer platen, and a second parison between said second inner platen and said second outer platen when said platens are in an open position;
- and
- (d) injectors adapted to inject a gas into the interiors of said first and second parisons when said platens are in a closed position.
Dependencies are inferred from the claim text.