Blow molding apparatus
AssigneePhillips Petroleum Company
InventorDonald L. Peters
Life of this patent
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Abstract
An apparatus for blow molding hollow articles from a heated parison of plastic with the apparatus including a blow mold having mold halves which are relatively movable and receive the parison therebetween. A mandrel is provided which is comprised of two halves each of which is carried by a respective mold half with the mandrel being movable between an extended position and a retracted position. A free end of each of the mandrel halves is adapted to engage a portion of the parison to hold same between the two mandrel halves thereby providing rigidity and support for puncturing of the parison by a blow needle which is reciprocably carried by one of the mandrel halves and is movable between an extended position and a retracted position.
Claims4
A blow molding apparatus comprising:
- (a) first and second mold portions forming a cavity, each said portion having a mating surface adapted to engage a mating surface of the other portion;
- (b) a mandrel with first and second halves each slidably mounted on a respective mold portion adjacent a respective mating surface and movable with a respective mold portion, said first and second halves have portions thereof which are operable to selectively engage a portion of a parison therebetween;
- (c) first means operably associated with said mandrel for effecting sliding movement of said first and second halves from an extended position wherein said mandrel portions are inside said cavity to a retracted position;
- (d) a blow needle slidably carried by one of the first and second halves;
- and
- (e) second means operably associated with said blow needle for effecting movement of said blow needle between an extended position and a retracted position independent of movement of the mandrel half carrying same wherein in said extended position the needle penetrates the parison and is operable to supply pressurized fluid to the interior of the parison to expand the parison.
Dependencies are inferred from the claim text.