| 摘要 |
An umbrella a fixed ring secured on top of a rod, a middle ring and a lower ring slidably engaged on the rod, a number of main staves having inner ends rotatably securing to the middle ring, a number of upper staves pivotally coupled between the fixed ring and the main staves, and a number of stave supports each having an inner end rotatably coupled to the lower ring and an outer end secured to the middle portion of the main staves. The main staves and the stave supports are made of composite materials for increasing the strength and for reducing the weight of the umbrella.
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