Patent ID: 8840073

Claim:
A leg structure that supports in an upright posture a container having a tubing port in a bottom portion thereof, comprising: a fixed leg fixed or removably mounted to the container; a movable leg capable of moving relative to the fixed leg so as to approach and be separated in a horizontal direction from the fixed leg while supporting the container; and a connecting section for connecting the container and the fixed leg to each other, such that the container is maintained in the upright posture relative to the fixed leg, a hinge member disposed at a higher position than the tubing port; a movable portion that extends in a circumferential direction around the container and is rotatable about a vertical axis at the hinge member, wherein the movable leg is fixed to the movable portion, wherein as the movable portion rotates, an interval between the movable leg and the fixed leg changes, and wherein in a state in which the container is supported by the leg structure, the container is fixed in the upright posture, and the fixed leg and the movable leg are arranged around the tubing port.