| 摘要 |
A windproof umbrella comprises a canopy including an upper canopy, a lower canopy not equal to upper canopy in size, and a vent hole provided in the center portion of the lower canopy; and a multiple frame including a shank, stationary hubs fixed on the shank, rings slidable along the shank, ribs for supporting canopy, and spreaders. Air beneath the lower canopy exits through a gap formed between upper and lower canopies when frame is stretched. Also, rings moves synchronously along the shank such that the stretching and folding of upper and lower canopies can be smooth and synchronous.
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