| 摘要 |
Two ends of a link (6) are mounted, so as to be able to move in the axial direction, onto two shafts (3a, 3b), which cross through a reference point of a base (2), and one end of the link is pressed toward the reference point by gas pressure of an interior space (32) of a gas actuator (30). The one end of the link is allowed to move such that a gap (A-B) between the reference point and the one-end position of the one end of the link in a state where the volume, found by extrapolating the change in volume of the interior space relative to the one-end position of the link, is 0 becomes at least the distance (D-E) between the two ends of the link, and the other end of the link is joined by a joining part (31) to a lift section (15) able to move in the vertical direction with respect to the base. |
