| 摘要 |
<p>The support frame is to hold the top cover, switch elements, clamps and lamps for mast head lighting. The support frame is made as a 'U' shaped frame with clamps at the leg ends for attachment to the mast. The clamps (2, 3) are made to fit at least two different size dia. mast. This is achieved by forming the clamps into step shapes, with the step walls (2a, 3a) having varying radii of curvature corresponding to different mast dias. The attachment surfaces of the steps with smaller radii are enlarged by walls extended (2C, 3c) concentric to the clamps outer walls.</p> |
