Ovalization and crush resistant container

An ovalization and crush resistant container having a finish, a base remote from the finish, a sidewall extending from the base, and a dome extending between and connecting the finish to the sidewall, the improvement wherein said dome has an upper tier and a lower tier, said upper tier having a plurality of pairs of chordal stiffening facets disposed in an endwise adjacent array extending transversely about the periphery of said dome between said finish and said lower tier, said lower tier having a plurality of pairs of chordal stiffening facets disposed in an endwise adjacent array extending transversely about the periphery of said dome between said upper tier and said sidewall, each facet pair having an inwardly-convex chordal stiffening rib forming an inflection between an upright and a transverse facet wall portion of said dome, each facet wall portion having an outwardly convex peripheral rib with an apogee located intermediate opposite ends of said chordal stiffening rib and with portions extending therefrom in opposite directions toward opposite ends of said chordal stiffening rib, said plurality of chordal stiffening ribs on each of said upper and lower tiers being of uneven number and defining a regular transverse polygon.

An ovalization and crush resistant container having a finish, a base remote from the finish, a sidewall extending from the base, and a dome extending between and connecting the finish to the sidewall, the improvement wherein said dome has an upper tier and a lower tier, said upper tier having a plurality of pairs of chordal stiffening facets disposed in an endwise adjacent array extending transversely about the periphery of said dome between said finish and said lower tier, said lower tier having a plurality of pairs of chordal stiffening facets disposed in an endwise adjacent array extending transversely about the periphery of said dome between said upper tier and said sidewall, each facet pair having an inwardly-convex chordal stiffening rib forming an inflection between an upright and a transverse facet wall portion of said dome, each facet wall portion having an outwardly convex peripheral rib with an apogee located intermediate opposite ends of said chordal stiffening rib and with portions extending therefrom in opposite directions toward opposite ends of said chordal stiffening rib, said plurality of chordal stiffening ribs on each of said upper and lower tiers defining a regular transverse pentagon, said upper tier being arranged with respect to said lower tier such that said apogees of said upper tier are offset from said apogees of said lower tier.

An ovalization and crush resistant container having a wide mouth annular finish, a sidewall, and a dome connecting said finish to said sidewall, said dome having a narrow annular transitional wall portion located immediately below said finish and surrounding said finish, said dome having a plurality of pairs of chordal stiffening facets disposed in an endwise adjacent array extending transversely about the periphery of said dome between said finish and said sidewall, each facet pair having an inwardly-convex chordal stiffening rib forming an inflection between an upright and a transverse facet wall portion of said dome, each facet wall portion having an outwardly convex peripheral rib with an apogee located intermediate opposite ends of said chordal stiffening rib and with portions extending therefrom in opposite directions toward opposite ends of said chordal stiffening rib, said narrow annular transitional wall portion connecting said apogees of said upright facet wall portion to said finish and being radially, outwardly and downwardly inclined between adjacent portions of said outwardly convex ribs defining said upright facet walls.