| 摘要 |
PURPOSE: An air speed sensing apparatus for hanging placard device is provided to rapidly sense the strong wind at the front or the behind of the banner post board. CONSTITUTION: The main body(4) is installed on the top of the pillar of the banner post board. The leaf spring(5) is installed as the state where the central part of the main body is set. According to the intensity of the wind, the leaf spring has the elastic force which is curve-cut in the front or the behind of the banner post board. The leaf spring contact assistant(6) is installed as the state which is built in the main body. The top end portion of the leaf spring contacts with the leaf spring contact assistant when the leaf spring is curve-cut in the front or the behind due to the strong wind. |
