Umbrella frame

Abstract

An umbrella frame has a main shaft and multiple branches pivotally attached around the main shaft. The main shaft has an immovable upper base and a movable lower base each having multiple retaining slots. Each branch is divided into a front section, a middle section and a rear section and has a supporting rib and a pulling rib both pivotally attached under the front section. Improvement of the umbrella frame is that the upper and lower bases respectively have multiple rectangular recesses individually and pivotally engaged pin heads on the front section or the supporting rib of each branch. Thereby, the umbrella frame is be quickly assembled or disassembled.

1 . An umbrella frame composed of a main shaft, an immovable upper base and a movable lower base mounted on the main shaft, and multiple branches pivotally attached around the upper base, each branch dividing into a front section, a middle section and a rear section pivotally combined in sequence and having a supporting rib and a pulling rib both pivotally attached under the front section, wherein improvement of the umbrella frame is that:  
       the upper base has multiple rectangular recesses individually and pivotally engaged a pin head on the front section of each of the multiple branches.  
     
     
         2 . The umbrella frame as claimed in  claim 1 , wherein the lower base has multiple rectangular recesses individually and pivotally engaged a pin head on the supporting rib of each of the multiple branches.