| 摘要 |
PROBLEM TO BE SOLVED: To provide a sealing device of high reliability capable of preventing the generation of negative pressure and improving the sealing performance. SOLUTION: A dust lip 8b comprises a bottomed recessed part 8b1 opened to a space 10 side, a recognizing part 8b2 mounted on a part equivalent to a bottom part of the bottomed recessed part 8b1 at an atmospheric side O to recognize the bottom part from the atmospheric air side O, and a cut part 8b3 cut from the atmospheric air side O in the recognizing part 8b2, the cut part 8b3 is opened and closed in accordance with the pressure difference between the inside of the space 10 and the atmospheric air side O, and communicating the space 10 and the atmospheric side O in an opened state. |
