| 摘要 |
A telescopic centerpost of a multiple-fold umbrella includes an upper retainer having an upper catch protruding leftwardly for supporting a left portion of a slider of umbrella canopy and spokes and a slider straightener having a protrusion protruding rightwardly for retaining a right portion of the slider for keeping the slider stably vertically, and at least a reinforced catch having two balls respectively engageable with two sets of double holes respectively formed in an inner tube and an outer tube for firmly coupling the inner and outer tubes.
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