| 摘要 |
PURPOSE:To obtain a required tension with a comparatively light weight by using a turning arm having a short arm part connected to a stay and a long arm part connected to the weight. CONSTITUTION:The turning arm 16 is fitted to an anchor plate 22 and the stay 3 is connected to the tip of the short arm part 19. A block 25 is fitted to a suporter 8 at the side of the plate 22, one end of a wire rope 26 wound on the block is connected to the tip of the long arm part 18 of the arm 16 and the other end is connected to the weight 7. An angle between the short arm part 19 of the arm 16 and the long arm part 18 is set so that the long arm part 18 is horizontal when the short arm part 19 and the stay 3 forms a right angle. Then, a large moment is produced to the turning arm 16 even with the comparatively light weight so as to give a sure tension to the stay of a large-sized antenna. |
