| 摘要 |
A lawn umbrella having a shade of a rectangular configuration supported by four ribs, the free end of each rib being received in a pouch at a respective corner of the shade. The other ends of two of the ribs are pivotably connected to a collar slidable on the mast, the collar being lockable in operative position by a thumb screw. The other ends of the other ribs are pivotably connected to the top of the mast. A pair of struts are pivotably connected at one end to the second mentioned ribs and at the other end to a second slidable collar. Another pair of struts are pivotably connected at one end to the mast and at their other ends to the respective first mentioned ribs.
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