| 摘要 |
PURPOSE: A pulley type polygonal telescoping mast is provided to prevent the free rotation of respective steps of a telescoping mast by forming a flexible mast, to easily manufacture a telescoping mast, and to lengthen the life span of a telescoping mast by simplifying the flexible motion of the mast. CONSTITUTION: A base tube(t1) and polygonal flexible tubes(t2,t3,t4,t5) are formed in the pile-up fashion. According to the polygonal tubes, the free rotation of the flexible tubes is avoided even without a separate device. The tubes are connected via pulleys(13,14) attached onto the tubes and an interlock wire rope(15). The tube(tn) is lifted up as much as the rising distance of the tube(tn-1).
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