| 摘要 |
PROBLEM TO BE SOLVED: To provide a height adjuster which stably adjusts a support at a predetermined height and positions it.SOLUTION: A height adjuster includes a tapered portion which is formed to reduce the diameter thereof from a bottom end towards a top end on an inner peripheral surface of a surrounding wall. On an inner wall, an elastic member is disposed which is extended/contracted along an axial direction of the inner wall. The inner wall includes an upper portion which is drawn upward through the surrounding wall, and a plurality of positioning holes which are formed in a radial direction of the inner wall. A positioning member is disposed in each of the positioning holes so as to be in contact with the tapered portion. A position limiting member is connected so as to accommodate the upper portion, and is provided so as to be movable vertically between a movable position where the position limiting member is movable vertically at a predetermined distance G from the top end, and a fixed position where the position limiting member is positioned in contact with the top end. |
