Abstract A plastic container such as a bottle for pressurized fluent materials having a specially designed lower body portion which minimizes areas of high stress concentration generated as a result of the pressure of the contents, yet is configured such that the container is self supporting on a horizontal surface without an auxiliary part. The shape of the lower body portion is that of a modified hemisphere wherein a segmented hemispherical surface tangentially blends into an intermediate portion, the center of which defines a seating ring for the container, the radius of curvature of the intermediate portion being such that the diameter of the seating ring is between 25 to 80 percent of the diameter of the container body immediately adjacent the lower body portion. A convex central base portion is tangential to the other end of the intermediate portion. The container is preferably formed from a high tensile strength polymer, the major component of which is polymerized from a monomer having one or more nitrile groups in its molecular structure.
A thermoplastic container for pressurized fluent materials comprising: a. a generally cylindrical sidewall portion having an opening at its upper end; b. a bottom portion at the other end of said sidewall portion having a modified hemispherical shape, said bottom portion comprising a lower sidewall portion in the form of a hemispherical segment of constant radius, a convex central base portion and a curved intermediate portion interconnecting said convex base portion with said lower sidewall portion, the radius of curvature of said intermediate portion being such that it is tangential at one end with the convex base and tangential at the other end with the hemispherical segment, said radius of curvature of the intermediate portion being 25 to 70 percent of the radius of curvature of said hemispherical segment, a section of the surface of said intermediate portion centered between said tangential points defining a seating ring for supporting said bottle on a horizontal surface, the diameter of said ring being between 25 to 80 percent of the diameter of the generally cylindrical sidewall portion immediately adjacent the bottom portion.
Claim 2
Dependent Claim
180 words
A thermoplastic container for pressurized fluent materials comprising: a. a generally cylindrical sidewall portion having an opening at its upper end; b. a bottom portion at the other end of said sidewall portion having a modified hemispherical shape, said bottom portion comprising a lower sidewall portion in the form of a hemispherical segment of constant radius, a convex central base portion and a curved intermediate portion interconnecting said convex base portion with said lower sidewall portion, the radius of curvature of said intermediate portion being such that it is tangential at one end with the convex base and tangential at the other end with the hemispherical segment, said radius of curvature of the intermediate portion being 25 to 70 percent of the radius of curvature of said hemispherical segment, a section of the surface of said intermediate portion centered between said tangential points defining a seating ring for supporting said bottle on a horizontal surface, the diameter of said ring being between 25 to 80 percent of the diameter of the generally cylindrical sidewall portion immediately adjacent the bottom portion.
Claim 3
Dependent Claim
39 words
The container of claim 1 wherein the thermoplastic is a polymer, the major component of which is formed from a monomer having at least one nitrile group in its molecular structure plus at least one other monomer copolymerized therewith.
Claim 4
Dependent Claim
23 words
The container of claim 2 wherein the amount of the major component in the polymer is between 51 to 98 percent by weight.
Claim 5
Dependent Claim
15 words
The container of claim 3 wherein the major component in the polymer is polymerized methacrylonitrile.
Claim 6
Dependent Claim
45 words
The bottle of claim 1 wherein the radii of curvature of a. the hemispherical segment is between 1/4 to 2 1/2 inches, b. the convex central base portion is between 1/2 to 20 inches and c. the intermediate portion is between 1/16 to 1.75 inches.