| 摘要 |
A wind-proof umbrella has secondary ribs pivotally connected with second linking ribs and having a flexibility the same as that of flexible ribs that are mounted between second joints on the second linking ribs and third joints on the outer supporting ribs. The secondary ribs are overlapped on top of the flexible ribs and able to pivot with respect to the flexible ribs so as to prevent a flip-over of the umbrella.
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