This invention relates to a kind of weathering umbrella may be opened or closed by one hand. It adopts a composite sliding block rocking poles mechanism and a trimember transition mechanism, which are compounded to form a compound mechanism through a common member. To drive these two mechanisms into relative movement by a single hand directly or through a manually operated increasing speed driving mechanism or through an electric operated retarding speed driving mechanism, this umbrella may be drived open or close. When the umbrella is in open state, it may be self-locked by the inner curved helical pair. The umbrella of said invention is not only to realize the open and close by a single hand, also possesses the merits of easy in operation, simple structure, open and close smoothly and stably, etc. |