| 摘要 |
A foldable umbrella includes a post; a stationary hub secured to an upper end of the post; a canopy centrally secured to the stationary hub; a sleeve slidably mounted on the post; a plurality of radially oriented ribs secured to the canopy in equiangularly spaced relation, each rib having a radially inner end and a radially outward end; a plurality of foldable strut assemblies, each strut assembly connected between the sleeve and a respective one of the ribs, each strut assembly including a first strut having one end pivotally connected at a first pivot point to the sleeve and a second end pivotally connected to a respective one of the ribs at a second pivot point spaced radially outwardly from the radially inner end of the rib, a second strut having one end pivotally connected at a third pivot point to the stationary hub and a second end pivotally connected at a fourth pivot point to an intermediate point of the first strut, and a third strut having one end pivotally connected at a fifth pivot point to an intermediate point of the second strut and a second end pivotally connected at a sixth pivot point to the respective one of the ribs, the sixth pivot point being positioned radially inward of the second pivot point; and a U-shaped channel mounted to each rib for receiving the first strut therein when the umbrella is in an open configuration.
|
