| 摘要 |
<p>The telescopic pole comprises a set of similar tubular elements (50, 52, 54, ..., 56) having decreasing cross-sections and lengths, closed at the bottom and each provided with a pair of turning, idle rollers (62, 64) journaled at their tops on opposite walls. Each tubular element is contained within the next bigger one, in such a way that successive tubular elements are alternately arranged with axes orthogonal to each other, and the entire set of tubular elements is contained within a tubular frame (22). Each tubular element has a flexible ribbon (66) attached at its ends to the tops of opposite walls not journaling the rollers, and each ribbon passes over the rollers of the next inward tubular element and under the closed end of the further tubular element. Lifting means (36-48) are provided for lifting the most external of said tubular elements with respect to the tubular frame.</p> |
