Patent ID: 6497242
Filing Date: 2002-12-24
Classification: A45B

Abstract:
A multiple-fold umbrella rib assembly comprising:a top rib having a cross section of U shape and pivotally secured to an upper notch formed on an upper portion of a central shaft; a stretcher rib having a cross section of U shape and pivotally secured to a runner slidably held on the central shaft, and said stretcher rib pivotally secured to said top rib; a middle rib pivotally secured to said stretcher rib, and pivotally secured to said top rib by an auxiliary rib; and a tail rib pivotally secured to said middle rib; the improvement which comprises: a. said top rib and said stretcher rib being made of aluminum alloy; b. said middle rib made of carbon-fiber-reinforced plastics and having an upper convex portion longitudinally formed on an upper portion of said middle rib, two reinforcing ribs longitudinally formed on opposite bottom edge portions of a bottom portion of said middle rib, and a bottom concave portion longitudinally recessed in said bottom portion of said middle rib between said two reinforcing ribs when opening the umbrella; and c. said tail rib made of carbon-fiber-reinforced plastics and having a cross section of circular shape.