Injection-molded planter having undercuts and process for manufacturing

A planter for holding a plant, comprising:

• a container having an open upper end with a first diameter;
• the container having side walls extending downward from the upper end and tapering inward to a lower end;
• a base at the lower end of the container that has a second diameter smaller than the first diameter of the upper end;
• a circumferential ring surrounding the lower end of the container, the circumferential ring having an upper edge that extends outward from the container;
• wherein the upper edge of the circumferential ring extends outward from the container by a distance such that removal of the container and ring from a mold as a single unit would be inhibited;
• wherein the container and the circumferential ring are molded as separate components from a thermoplastic material;
• wherein the circumferential ring fits around the lower end of the container and is held in place by a mechanical interlock between the container and the ring;
• wherein the lower end of the container adjacent the base comprises a circumferential wall;
• wherein the circumferential wall at the lower end of the container comprises a generally frustoconical, angled lower wall portion that slants upward and outward from the base;
• wherein the circumferential wall at the lower end of the container further comprises an upper wall portion extending substantially vertically upward from the upper end of the angled lower wall portion;
• wherein an inner surface of the ring comprises a generally frustoconical, angled lower wall portion that slants upward and outward from the lower end of the ring;
• and
• wherein the inner surface of the ring further comprises an upper wall portion extending substantially vertically upward from the upper end of the angled lower wall portion of the ring;
• wherein the mechanical interlock between the container and the ring comprises a male interlock projection on one of the outer surface of the container and the inner surface of the ring and a cooperating female interlock recess on the other of the outer surface of the container and the inner surface of the ring;
• whereby when said ring is positioned on the outside bottom portion of the container, the male interlock projection engages the cooperating female interlock recess to retain the ring on the lower end of the container;
• wherein one of the male interlock projection and the female interlock recess is formed on the circumferential wall at the lower end of the container approximately at the intersection between the angled lower wall portion and the upper wall portion extending substantially vertically upward from the upper end of angled lower wall portion;
• and wherein the other of the male interlock projection and the female interlock recess is formed on the inner surface of the ring approximately at the intersection between the angled lower ring inner wall portion and the upper ring wall portion that extends substantially vertically upward from the upper end of angled lower ring inner wall portion.