Mold assembly for manufacturing heavy duty plastic hollow board

Details Mold assembly for manufacturing heavy duty plastic hollow board Mold assembly for manufacturing heavy duty plastic hollow board

2006-06-13

2008-11-25

Davis, Robert B (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

Forming baffle, bottleneck, or handle

C425S522000

Reexamination Certificate

active

07455512

ABSTRACT:
A heavy duty plastic hollow board and a mold assembly for manufacturing the same, wherein the plastic board is made through an integrated molding process and the exterior thereof is integrally closed to contain an inward space with a plurality of strengthening ribs; wherein the mold assembly for manufacturing said board comprises a first mold, a second mold, cavities respectively arranged on the opposite surfaces of both molds, a movable mold arranged associated to the outer surface of the second mold which is movable for a predetermined distance from the second mold; a plurality of rib-forming members of the movable mold to be received by a plurality matching through holes of the second mold. As the movable mold approaches and is combined with the second mold, the rib-forming members thread through the through holes and appear in the cavity of the second mold. Thereagainst, while the movable mold leaves the second mold, the rib-forming members completely depart from said cavity.

REFERENCES:
patent: 4715473 (1987-12-01), Tschudin-Mahrer
patent: 6060163 (2000-05-01), Naaman
patent: 6103163 (2000-08-01), Joppen et al.
patent: 6592358 (2003-07-01), Iwasaki
patent: 06134842 (1994-05-01), None
patent: 2000043541 (2000-02-01), None

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