| 摘要 |
A collapsible frame structure is provided for umbrella with self-opening mechanism. The collapsible frame structure is more durable than the prior art by using enforced light-weighted materials such as FRP to form the umbrella frame and steel bars to form the linkage beams. Each of the second pivotal-coupling device of the supporting rib is integrally formed with each of the inner linking member of the supporting rib so as to form a compound pivotal-coupling device. Therefore, the collapsible frame structure is easy in assembly process and the yield ratio is also increased.
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