Patent ID: 9242762
Filing Date: 2016-01-26
CPC Classification: B65D

Claim Text:
1. A bottle formed of a synthetic resin material in a shape of a bottomed cylinder by blow molding, the bottle comprising: a bottom wall part of a bottom part including: a grounding part located at an outer circumferential edge of the bottom wall part, a standing peripheral wall part configured to connect to the grounding part from a radial inner side of the bottle and to extend upward, an annular movable wall part configured to protrude from an upper end of the standing peripheral wall part toward the radial inner side of the bottle, and a depression peripheral wall part configured to extend upward from an inner end of the movable wall part in a radial direction of the bottle, wherein the movable wall part is disposed to freely pivot around a connection part connected with the standing peripheral wall part so as to move the depression peripheral wall part in an upward direction, and the depression peripheral wall part is formed to have multiple stages, an annular width of the movable wall part in the radial direction of the bottle is within a range of 20% to 40% of a ground diameter in the grounding part, and the depression peripheral wall part is formed with an angular cylindrical part of a polygonal shape in which a plurality of overhang parts projecting toward the radial inner side of the bottle are formed in succession in a circumferential direction of the bottle, and thereby a shape of the angular cylindrical part when viewed from a cross section thereof is configured so that midsections located between the plurality of overhang parts adjoining each other in the circumferential direction of the bottle become corner parts and so that the plurality of overhang parts become side parts, and when viewed from a longitudinal section of the angular cylindrical part, each of the midsections and each of the plurality of overhang parts is formed as a curved surface protruding toward the radial inner side of the bottle, and a radius of curvature of each of the midsections is greater than that of each of the plurality of overhang parts.