| 摘要 |
PURPOSE:To always keep a constant height from the surface of the sea for the antenna, by shifting up and down the antenna supported in the free up-down movable way by the maritime structure in accordance with the tide level. CONSTITUTION:Plural numbers of radial horizontal protruded components 5 are fixed at the upper end of steel tower 3 fixed onto maritime structure 2, and pulley 6 is attached to the lower face of each component 5. Antenna 1 is made linear and hanged down vertically on cord 7 hooked to pulley 6, and balancing weight 8 is attached to one end of cord 7. At the same time, float 10 is attached to the lower end of antenna 1 via cord 9. And float 10 is always under the sea level with a certain depth in order to secure a balance between the upward force produced by weight 8 and the buoyancy and the downward force by the empty weight. As a result, float 10 shifts up and down with the up-down movement of the sea level caused by the change of the tide level, and accordingly both weight 8 and antenna 1 shift. Thus a constant height from the sea level can always be secured for antenna 1. |
