Umbrella cover for wind-stable umbrella

Abstract

An umbrella cover for a wind-stable umbrella is provided. The umbrella cover includes a main cover provided at a central area with at least one opening and a compensating cover adapted to loosely close the at least one opening on the main cover for a wind passage to exist between the main and the compensating covers. The at least one opening is provided at an outer edge with flaps. Free ends of these flaps upward and radially outward extend, allowing the flaps to function like a one-way valve. When a wind blows into the umbrella and moves upward to pass the at least one opening of the main cover, the flaps can be flattened by the wind for the wind to pass the wind passage and move out of the umbrella, protecting the umbrella against an overstrong wind pressure. When a wet wind sideward blows against the umbrella, free ends of the flaps are blown open to block the wind passage, stopping wind and rain from invading the umbrella via the at least one opening. And, when the umbrella is collapsed, free ends of the flaps fall open to catch rainwater flowing downward along the main cover, protecting components of the umbrella from rusting due to rainwater.

What is claimed is:  
     
         1 . An umbrella cover for wind-stable umbrella, said umbrella including a shaft, an upper hub fixedly mounted to an upper end of said shaft, a lower hub upward and downward movably mounted around said shaft, a skeleton including a plurality of ribs and stretchers pivotally connected to said upper and said lower hubs, and an umbrella cover tacked to a top of said skeleton, said umbrella cover for wind-stable umbrella comprising a main cover and a compensating cover, said main cover being provided at a central area with at least one opening, such that said main cover covers a peripheral area above said skeleton when said main cover is tacked to a top of said skeleton; said compensating cover being tacked to said skeleton to loosely close said at least one central opening of said main cover, such that a wind passage exists between said main and said compensating covers; said umbrella cover being characterized in that said main cover includes a plurality of flaps connected at an end to an outer edge of said at least one central opening, such that a free end of each of said flaps upward and radially outward extends over said main cover, said flaps being normally in a loosely outward stretched state and being flattened against said main cover by wind flowing in a direction in which said free ends of said flaps extend, said flaps functioning like a one-way valve allowing wind to blow through said flaps and accordingly said wind passage in only one direction from an inner side to outer side of said umbrella but stopping wind and rain from invading said umbrella via said wind passage from outer side to inner side of said flaps.