Molding apparatus including a flexible mold for making articles

Details Molding apparatus including a flexible mold for making articles Molding apparatus including a flexible mold for making articles

1975-01-20

1977-06-07

Shore, Ronald J.

Metal founding

Means to shape a forming surface

Including means for separating forming surface from shaping...

164 7, 164187, 164245, 164253, 425437, 164401, B22C 1700, B22C 700

Patent

active

040277232

ABSTRACT:
Apparatus for molding, for example, a seamless brake drum female mold having a plurality of radially inwardly extending grooves and ridges. The apparatus includes a generally hollow one-piece distensible and flexible hollow male mold having an annular side wall having a plurality of radially extending projections and undercuts and includes an outer core box positioned around the flexible mold and defining an annular cavity with it. The apparatus further comprises a packing mandrel for supporting the hollow flexible mold while mold material is packed around it and a vacuum mandrel to be inserted within the flexible mold to cause the collapse of the flexible mold so that the molded article can be lifted off the flexible mold despite the radially extending projections.

REFERENCES:
patent: 925249 (1909-06-01), Taylor et al.
patent: 1021349 (1912-03-01), Bryant
patent: 2491146 (1949-12-01), Zohn
patent: 2903762 (1959-09-01), Candron
patent: 3257690 (1966-06-01), Scott
patent: 3642975 (1972-02-01), Duggins et al.
patent: 3822106 (1974-07-01), Bonet Sirera
patent: 3830279 (1974-08-01), Arbenz et al.

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