| 摘要 |
An improved umbrella includes a durable hub including a number of spherical rotating joint knuckles captured in a hub body. The joint knuckles provide rotational movement of rib and spreader elements which support a flexible umbrella cover. The joint knuckles provide increased bearing surface area that increases ease of use and durability. The hub design enables identical hub bodies to be used for a spreader hub and a rib hub.
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