| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a controller which has an open/close indicator which indicates an open or a closed state of a passage while surely interlocking with the opening and closing of the passage, and is visibly confirmed from any direction in an easy manner. SOLUTION: An operation shaft guide groove 69 whose upper end is opened is formed inside a casing 61. An open/close indicator 77 is arranged on an upper end of an operation shaft 21, which is located inside the operation shaft guide groove 69 under a closed state where the operation shaft 21 is arranged on a lower position. A transparent lens 81 in convex shape is projected upward from a top face of the casing 61, for closing the upper end opening of the operation shaft guide groove 69. Under an open state where the operation shaft 21 is moved upward, the open/close indicator 77 is projected upward from the top face of the casing 61, and visibly confirmed through the transparent lens 81.</p> |
