摘要：

A blow-molded bottle of thermoplastic resin has a hollow body with a generally cylindrical side wall rotationally symmetric about a longitudinal axis of the bottle and an integral base merging with the side wall. The base is defined by an outer surface having a plurality of arcuately extending downward projections separated from each other by hemispherical segments extending from the cylindrical side wall to the longitudinal axis of the bottle. Each of the arcuately extending downward projections has a first inclined portion contiguous to the longitudinal axis, a second inclined portion situated radially outside of, and axially displaced downwardly from, the first inclined portion, a generally perpendicular ring segment having an upper edge united with the first inclined portion by a curved portion having a radius of between about 0.015 in. and 0.060 in., and a lower edge united with the second inclined portion. A radially outwardly and upwardly curved portion defining the axially lower most extent of each downward projection has an inner edge united with the second inclined portion. An inclined outer wall portion having an upper edge united with the cylindrical side wall has a lower edge united with the radially outwardly and upwardly curved portion. Slanted radial facets merge the sides of the arcuately extending downward projections with the hemispherical segments extending from the cylindrical side wall to the longitudinal axis of the bottle.

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