| 摘要 |
PURPOSE:To weaken simply a wind pressure of a reflecting plate by forming a gap between adjacent reflecting plates constituting a parabolic antenna so as to release the wind pressure when the wind pressure is a prescribed value or over. CONSTITUTION:A free end of the split reflecting plates 12 is energized by an energizing means 17 so as to be pressed into contact with a frame 11 respectively when the wind pressure is not strong. Thus, the parabolic antenna is in the reception state. When the wind pressure is a prescribed value or over, the reflecting plates 12 are depressed against an elastic force of a spring 14 and turns around a shaft 13. The wind pressure is released by the gap 15 produced by the turning so as to weaken the wind pressure to the reflection plates 12. When the wind pressure is weakened, the plates restore automatically to the reception state by the energizing means 17. Thus, the wind pressure exerted to the reflecting plates is weakened simply. |
