Plastic blow molded freestanding container

摘要

A plastic blow molded container (10) is disclosed as including a freestanding base structure (20) that is constructed with a plurality of alternating hollow legs (22) and curved ribs (34), and a hub (41) from which the legs and ribs extend radially with a construction that provides good stability against tipping as well as the capability of withstanding internal pressure. Each rib (34) has an outer upper end (36) with a circumferential width Wu and an inner lower end (38) with a circumferential width Wl that is greater than the circumferential width Wu of the upper rib end so the lower rib end is capable of resisting stress cracking. An intermediate rib portion (40) of a curved shape tapers between the ends with an included angle B in the range of about 1° to 8° and preferably about 2°. The specific construction disclosed of the legs (22), ribs (34) and hub (41, 41' and 41'') enhance the capability of the base structure in providing good stability as well as the capability of withstanding internal pressure and stress cracking.