Two-piece bottom plate for making crown bottom glassware on the

Details Two-piece bottom plate for making crown bottom glassware on the Two-piece bottom plate for making crown bottom glassware on the

1977-12-20

1981-08-11

Fisher, Richard V.

Glass manufacturing

Processes

Forming product or preform from molten glass

65242, 264531, 425522, C03B 9197, C03B 9335

Patent

active

042832152

ABSTRACT:
A mold assembly and method for automatically making crown bottom blown glassware wherein a charge of molten glass is shaped into a hollow preform in a parison mold by means of a plunger. The hollow preform or parison is removed from the parison mold and placed in a finishing mold having a bottom forming assembly comprised of an annular member slidably contained in the bottom end of the finish mold and a domed central member slidably mounted in the annular member such that it can be reciprocated from a normally retracted position level with or slightly below the top surface of the annular member to a position above that surface. The hollow preform is allowed to sag into partial contact with the surfaces of both the retracted domed member and the annular member at which time the central member is advanced upwardly in the annular member so its domed position is above the top surface of the annular member, and then both plate members are advanced upwardly into full contact with the preform while the preform is blown into its finished shape.

REFERENCES:
patent: 1972717 (1934-09-01), Schutz
patent: 3130030 (1964-04-01), Watson et al.
patent: 3184298 (1965-05-01), Van Zonneveld
patent: 3792988 (1974-02-01), Nowak et al.

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