| 摘要 |
PROBLEM TO BE SOLVED: To achieve a smooth operation of a float shaft, even when external force other than buoyance is applied to the float shaft.SOLUTION: A float shaft 17 to whose center part a float 16 is attached, is inserted into a shell 11. A tip end part of an upper shaft part 17a on an upper side of the float 16 is attached to a damper mechanism 18 disposed in a connection pipe 14 through an adjustable joint 23, and a lower shaft part 17b on a lower side is inserted into a bearing part 20 vertically movably. The damper mechanism 18 having a cylindrical cylinder 18a whose opening part faces downward, is configured so that, in a cavity maintaining airtightness, a piston part 18b can vertically slide which changing air pressure in the cavity. Connection between the upper end part 17a of the float shaft 17 and the damper mechanism 18 is achieved through the adjustable joint 23, so that, even when displacement in a radial direction, other than that in a buoyance direction or inclination in a radial direction occurs on the float shaft 17, following is possible.SELECTED DRAWING: Figure 1 |
