| 摘要 |
A foldable umbrella includes a post (12), a stationary hub (14) secured to a n upper end of the post (12), a canopy (16) centrally secured to the stationary hub (14), a sleeve (18) slidably mounted on the po st (12), a plurality of radially oriented ribs (22) secured to the canopy (16) in equiangularly spaced relation, each rib (22) having a radiall y inner end (24) and a radially outward end (26), a plurality of foldable strut assemblies (28), each strut assembly (28) connected between t he sleeve (18) and a respective one the ribs (22), each strut assembly (28) including a first strut (30) having one end pivotally connecte d to a respective one of the ribs (22) at a second pivot point (34) spaced radially outwardly from the radially inner end of the rib, a second strut (36) having one end pivotally connected at a third pivot point (38) to the stationary hub (14) and a second end pivotally connected a t a fourth pivot point (4O) to an intermediate point of the first strut (30), and a third strut (42) having one end pivotally connected at a fifth pivot point (44) to an intermediate point of the second strut (36) and a second end pivotally connected at a sixth pivot point (46) to the respective one of the ribs (22), the sixth pivot point (46) being positioned radially inward of the second pivot point (34), and a U-shaped channel (48) mounted to each rib (22) for receiving the first strut (30) therein when the umbrella is in the open configuration.
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