Abstract: An injection mold assembly for formation of thin walled multi-partitioned plastic containers. An array of cantileveredly mounted and spaced apart cores are extendable into a female mold assembly which includes a pair of side cavity cams and end cavity cams closeable upon the array, but spaced therefrom to form the plastic container therebetween. A plurality of side locking wedge shaped fingers are extendable into the slots spacing the cores apart. The fingers are arranged to extend into the opposite sides of the array of cores in a direction perpendicular to the longitudinal axis of the array spacing the cores apart while plastic is injected into the assembly by injectors mounted to the female mold. A pair of end pushers contact the two outermost cores in the array limiting outward movement of the cores during the injection step. The end pushers likewise extend in a direction perpendicular to the longitudinal axis of the array.

Abstract: A plastic injection mold having means therein for holding an insert to be secured in the formed product. A pair of complimentary sized mold sections are movable together, one mold section having a pin fixedly mounted thereto and extending toward a second pin slidably mounted in the second mold section and aligned with the first pin. In the preferred embodiment, a helical spring contacting the slidable pin urges the pin outwardly to initially hold an insert. As the mold closes, the pins are contacted together with the spring being yieldable to allow retraction of one pin and the transfer of the insert mounted thereon onto the second pin. In an alternate embodiment, the retractable pin is fixedly mounted to a movable plate having a spring loaded leg depending therefrom with the leg being contactable by the mold sections as the mold is closed for the retraction of the slidable pin and the transfer of the insert.

Abstract: An injection mold assembly for formation of thin walled multi-partitioned plastic containers. An Array of cantileveredly mounted and spaced apart cores are extendable into a female mold assembly which includes a pair of side cavity cams and end cavity cams closeable upon the array, but spaced therefrom to form the plastic container therebetween. A plurality of side locking wedge shaped fingers are extendable into the slots spacing the cores apart. The fingers are arranged to extend into the opposite sides of the array of cores in a direction perpendicular to the longitudinal axis of the array spacing the cores apart while plastic is injected into the assembly by injectors mounted to the female mold. A pair of end pushers contact the two outermost cores in the array limiting outward movement of the cores during the injection step. The end pushers likewise extend in a direction perpendicular to the longitudinal axis of the array.

Abstract: A mold assembly is described for molding smooth-bottomed battery cases in which the necessary compression locking of the free ends of the elongated cantilever mounted cores is achieved by providing transverse locking pins which are carried within, and actuated to extend from, the interior of the cores themselves. Since no locking pins extend from the cavity, the interior surface of the base wall of the battery case is formed relatively smooth and flat.