Rib assembly of umbrella

Abstract

A rib assembly of umbrella having added safety to a user and longer service life is provided. The umbrella assembly structure has grooves of the outer and inner ribs faced away from the user. In other words, the sharp edges of the inner and outer ribs are turned away from the user to prevent hand cuts. Structurally, the use of grooved inner rib over a solid rib helps to reduce the weight of the rib assembly. In addition, the umbrella assembly structure has a secure portion of the outer rib removed to maintain the structural strength of the outer rib.

1 . A rib assembly of umbrella, comprising:
 a pole;   a top notch fixed to the pole;   a middle runner slidably mounted on the pole;   a bottom runner slidably mounted on the pole;   at least one flexible member mounted on the pole;   at least one stretcher connected pivotally on one end to the top notch;   at least one outer rib connected pivotally on one end to each stretcher, each outer rib is pivotally connected on another end to the middle runner, a continuous groove is formed on each outer rib facing each stretcher; and   at least one inner rib having an insertion end and a fixing end extended therefrom, the fixing end is further extended in forming a secure portion pivotally connecting to the outer rib, the insertion end is pivotally connected to the bottom runner, a continuous groove is formed on each inner rib facing each outer rib to accommodate each outer rib therein.   
     
     
         2 . The rib assembly of umbrella of  claim 1 , wherein the continuous groove of each outer and inner rib is U-shaped. 
     
     
         3 . The rib assembly of umbrella of  claim 1 , wherein each stretcher is steel or plastics. 
     
     
         4 . The rib assembly of umbrella of  claim 1 , wherein each outer rib and each inner rib is aluminum alloys or iron alloys. 
     
     
         5 . The rib assembly of umbrella of  claim 1 , wherein each flexible member is a spring unit.