Collapsible mold core

Details Collapsible mold core Collapsible mold core

1980-04-18

1981-09-01

Flint, Jr., J. Howard

Static molds

Container-type molding device

And an inner removable core to form recess or opening

249 58, 249178, 249184, 425DIG218, 425DIG58, 425438, 425597, B29C 700

Patent

active

042867665

ABSTRACT:
A collapsible mold core comprises an inner core member defining opposed first and second ends. The inner core member tapers transversely to a reduced diameter from the first to the second end. A plurality of outer core members are attached to the lateral exterior of the inner core member in longitudinally slidable relation to it between first and second sliding positions. The outer core members define first and second ends corresponding in position to the first and second ends of the inner core member, with the outer core members tapering inwardly in transverse dimension from their second to their first ends to provide an opposite taper to that of the inner core member. The mold core is of lesser transverse diameter in the second sliding position than in the first sliding position. This permits the molding of an object such as a straight-walled bucket having an inwardly-projecting lip about the mold core while it occupies the first sliding position. Thereafter, removal of the object from the core can be accompanied with the transfer of the mold core to the second sliding position, permitting the removal of the bucket from the core.

REFERENCES:
patent: 2948031 (1960-08-01), Webb
patent: 3248756 (1966-05-01), Mills et al.
patent: 3339242 (1967-09-01), Lamb
patent: 3373460 (1968-03-01), Ladney
patent: 3677684 (1972-07-01), Platz
patent: 3865529 (1975-02-01), Guzzo
patent: 4019711 (1977-04-01), Altenhof et al.
patent: 4107249 (1978-08-01), Murai et al.
patent: 4125246 (1978-11-01), von Holdt

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