| 摘要 |
A rib assembly for a folding umbrella which comprises a support rib, a receiving rib, an end rib and a connecting rib which are so assembled that they are adapted to form a quadrilateral in the open position of umbrella, said receiving rib being adapted to be held at substantially right angles with a center rod of the umbrella in said open position, one or more corners of said quadrilateral being made slidable and/or one or more sides of said quadrilateral being made contractile and extensible, thereby enabling the length of at least one side of the quadrilateral to be varied. Thus, there can be provided a folding umbrella capable of being easily opened with a little force and folded neatly while making an external appearance of the umbrella beautiful or nice at the open position thereof.
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