Base for a mold assembly

Details Base for a mold assembly Base for a mold assembly

1996-09-10

1998-06-09

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Lens mold

249 79, 425526, B29C 4948

Patent

active

057629811

ABSTRACT:
A base assembly for use as a part of a mold assembly for making containers comprises an adaptor, a base insert (or base plug), and a wear ring. The base insert is made from aluminum and has a lower surface positioned on a flat upper supporting surface of the adaptor. The base insert has an upper surface with a ledge surrounding a recessed contoured pattern in the base insert Which pattern corresponds to a base of the container to be formed. The base insert has an annular side wall portion. The wear ring has an inner annular surface surrounding and engaging the annular side wall portion of the base insert to protect the annular side wall portion. The wear ring comprises a hardened wear resistant steel ring adapted to reinforce the base insert during formation of the container. The base insert and wear ring are secured to the adaptor by threaded fasteners that pass through threaded apertures in the adaptor, the base insert and the wear ring. By using an aluminum base insert the mass or weight of the base assembly is reduced and the heat transfer characteristics of the base assembly are improved reducing container forming cycle time. Further, the wear ring can be hardened by heat treatment which increases the strength of the wear ring above that of steel base inserts eliminating the need for stellite welding to reinforce the base insert.

REFERENCES:
patent: Re30215 (1980-02-01), Kuenzig et al.
patent: 3733384 (1973-05-01), Gerlovich et al.
patent: 3843286 (1974-10-01), Horberg, Jr. et al.
patent: 3907475 (1975-09-01), Bowers
patent: 4032278 (1977-06-01), Kuenzig et al.
patent: 5255889 (1993-10-01), Collette et al.
patent: 5383777 (1995-01-01), Pace

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