| 摘要 |
An extensible positioning device of the shank of an umbrella includes an outer tube, an inner tube, an adjusting cylinder and a fixing cylinder. The inner tube may telescope in the outer tube. The outer tube has holes spaced apart horizontally in a lower portion for compressing members of positioning arms of the fixing cylinder to move in and out. The adjusting cylinder has female threads formed in a lower end, and the fixing cylinder has male threads engaging the female threads after the adjusting cylinder and the fixing cylinder fit around the outer tube. When the adjusting cylinder is screwed tightly around the fixing cylinder, the compressing members of the fixing cylinder moves gradually in the holes of the outer tube and further compress the inner tube tightly to keep the inner tube at an adjusted position relative to the outer tube.
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