| 摘要 |
This invention is concerned with shade structures, such as umbrellas, particularly large free-standing umbrellas, which have at least one hub that carries a plurality of ribs and which is separable into at least two hub components, each carrying a set of ribs. The hub components of each of the relevant hub(s) are nestable together to provide new combinations of rib geometry that are particularly useful in umbrellas having more efficient operating characteristics and/or variable geometry.
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