Pressure reduction-absorbing bottle
The present invention is a pressure reduction-absorbing bottle having a cylindrical shape with a bottom made of a synthetic resin material in which a bottom wall portion of a bottom portion of the bottle includes a grounding portion, a rising circumferential wall portion, a movable wall portion, and a central wall portion, the movable wall portion includes a curved portion having a curved surface shape protruding downward, the curved portion is connected to an outer end portion of the central wall portion in a bottle radial direction, and a lowest portion of the curved portion positioned at a lowest position thereof is located at a portion of the curved portion further outward in the bottle radial direction than a central position of the curved portion in the bottle radial direction.
1. A pressure reduction-absorbing bottle having a cylindrical shape with a bottom and formed of a synthetic resin material, the bottle comprising:
a bottom wall portion in a bottom portion of the bottle including:
a grounding portion positioned at an outer circumferential edge of the bottom wall portion;
a rising circumferential wall portion connected to the grounding portion from an inner side of the bottle in a bottle radial direction and extending upward;
an annular movable wall portion extending from an upper end portion of the rising circumferential wall portion toward the inner side of the bottle in the bottle radial direction; and
a central wall portion connected to an inner end portion of the movable wall portion in the bottle radial direction, wherein
the movable wall portion is arranged to be configured to be freely rotationally moved about a connection portion between the movable wall portion and the rising circumferential wall portion in a vertical direction together with the central wall portion and the movable wall portion includes a curved portion having a curved surface shape protruding downward,
the curved portion is connected to an outer end portion of the central wall portion in the bottle radial direction, and
a lowest portion of the curved portion positioned at a lowest position thereof is disposed at a portion of the curved portion positioned further outward in the bottle radial direction than a central position of the curved portion positioned at a center between outer and inner ends of the curved portion in the bottle radial direction.
2. The pressure reduction-absorbing bottle according to claim 1 ,
wherein the central wall portion extends upward from the inner end portion of the movable wall portion in the bottle radial direction.
3. The pressure reduction-absorbing bottle according to claim 2 , wherein an outer end portion of the movable wall portion in the bottle radial direction is an inclined portion gradually extending upward as it goes from the upper end portion of the rising circumferential wall portion toward the inner side of the bottle in the bottle radial direction.
4. The pressure reduction-absorbing bottle according to claim 1 , wherein an outer end portion of the movable wall portion in the bottle radial direction is an inclined portion gradually extending upward as it goes from the upper end portion of the rising circumferential wall portion toward the inner side of the bottle in the bottle radial direction.
5. The pressure reduction-absorbing bottle according to claim 4 , wherein, in a vertical cross-sectional view in a bottle axial direction, a curvature radius of a connection portion between the inclined portion and the upper end portion of the rising circumferential wall portion is greater than a curvature radius of a connection portion of the movable wall portion between the inclined portion and the curved portion connected to the inclined portion from an inner side of the inclined portion in the bottle radial direction.
6. The pressure reduction-absorbing bottle according to claim 4 , wherein, in a vertical cross-sectional view in a bottle axial direction, a length of the curved portion of the movable wall portion connected to the inclined portion from an inner side of the inclined portion in the bottle radial direction and connected to the central wall portion from an outer side of the central wall portion in the bottle radial direction is greater than a length of the inclined portion.
7. The pressure reduction-absorbing bottle according to claim 5 , wherein, in the vertical cross-sectional view in the bottle axial direction, a length of the curved portion of the movable wall portion connected to the inclined portion from an inner side of the inclined portion in the bottle radial direction and connected to the central wall portion from an outer side of the central wall portion in the bottle radial direction is greater than a length of the inclined portion.