| 摘要 |
PURPOSE:To enable sharp varying of a cut-off level, by a method wherein a float is attached to the forward end of a lever through a coupling material extending vertically upward, and a means for regulating the height of the float from the forward end of the lever is provided. CONSTITUTION:A coupling rod 20 is attached to the forward end of a shaft 3a through a height regulating metal 19, and a float 21 is attached to the coupling rod. The height regulating metal 19 has two nipping pieces 19a, the coupling rod 20 is held at an arbitrary level between the nip formed by the nipping pieces 19a to tighten and secure the metal by means of a bolt 22. A securing position is varied by means of the height regulating metal 19 of the coupling rod 20, and this enables the height of the float 21 from the forward end of the shaft 3a to be freely and continuously varied. |
