Bottle
The bottle is provided with a base portion installed on the outer circumference brim of the bottom, a central recess installed inside the base portion and recessed toward the inside of the bottle, an annular wall portion installed between the base portion and the central recess and inclined so as to elevate gradually from the base portion to the central recess, and a plurality of ribs installed side by side at the annular wall portion in the circumferential direction of the bottom and protruding toward the inside of the bottle. The ribs are provided with a rising wall portion rising toward the inside of the bottle and an inclined wall portion inclined from the upper brim of the rising wall portion toward the lower brim of the rising wall portion of an adjacent rib. The rising wall portion is inclined more steeply than the inclined wall portion.
1. A bottle comprising:
a base portion located on an outer circumference brim of a bottom of the bottle, the base portion touching the ground when the bottle is set upright;
a central recess located inside the base portion and recessed toward an inside of the bottle;
an annular wall portion located between the base portion and the central recess and inclined so as to elevate gradually from the base portion to the central recess; and
a plurality of ribs located side by side at the annular wall portion in the circumferential direction of the bottom of the bottle and protruding toward the inside of the bottle, wherein
the plurality of ribs are each provided with
a rising wall portion that has an upper brim and a lower brim thereof provided between the base portion and the central recess such that the upper brim and the lower brim are rising from the base portion to the central recess, the rising wall portion rising from the lower brim to the upper brim, and
an inclined wall portion that connects between the upper brim of the rising wall portion of a first rib of the plurality of ribs and the lower brim of the rising wall portion of a second adjacent rib of the plurality of ribs and is inclined from the upper brim of the rising wall portion of the first rib toward the lower brim of the rising wall portion of the second adjacent rib,
when the bottom of the bottle is viewed from a cross section along the circumferential direction, an angle θ1 made by an outer surface of the rising wall portion and an outer surface of the base portion in the circumferential direction is set to be in a range of 45 to 90 degrees, and
an angle θ2 made by an outer surface of the inclined wall portion and an outer surface of the base portion in the circumferential direction is set to be in a range of 5 to 45 degrees.
2. The bottle according to claim 1 , wherein the angle θ1 is in a range of 60 degrees to 75 degrees, and the angle θ2 is in a range of 15 degrees to 30 degrees.
3. The bottle according to claim 1 , wherein
the rising wall portion is formed in a triangular shape and the inclined wall portion is formed in a fan shape.
4. The bottle according to claim 1 , wherein
the angle θ1 is larger than the angle θ2.
5. The bottle according to claim 1 , wherein
an area of the rising wall portion is larger than an area of the inclined wall portion.
6. The bottle according to claim 1 , wherein
the rising wall portion is formed in a triangular shape so as to be tapered as the rising wall portion comes closer to the base portion.