Umbrella with offset gore

Abstract

An umbrella includes a shaft and a runner is movably mounted to the shaft. A frame unit is connected to the runner and a top of the shaft. The frame unit extends laterally from the shaft. A first cap and a second cap are connected to the distal end of the frame unit. A rib unit is connected to the frame unit so as to be connected to a gore whose center is located offset from the axis of the shaft. A positioning portion is connected to the top of the shaft or the top of the runner. A positioning rib unit is pivotably connected to the positioning portion. The positioning portion firmly supports the positioning rib unit and the gore when the umbrella is opened.

What is claimed is: 
     
         1 . An umbrella comprising:
 a shaft and a runner movably mounted to the shaft;   a frame unit connected to the runner and a top of the shaft, the frame unit having a first link and a second link, the first and second links pivotably connected to each other at two respective mediate portions thereof, the frame unit extending laterally from the shaft, a distal end of the first link connected to a first cap, a distal end of the second link connected to a second cap;   a rib unit connected to the first and second caps, a gore connected to the rib unit and located offset from an axis of the shaft, and   a positioning portion connected to the top of the shaft or a top of the runner, a positioning rib unit pivotably connected to the positioning portion, the positioning rib unit pivotably connected to the frame unit, when the umbrella is opened, the positioning rib unit is stable and the gore is stably opened by the positioning portion.   
     
     
         2 . The umbrella as claimed in  claim 1 , wherein the positioning portion is connected to the top of the shaft, the positioning rib unit has a positioning stretcher which is pivotably connected between the runner and the positioning rib unit. 
     
     
         3 . The umbrella as claimed in  claim 1 , wherein the positioning portion is connected to the top of the runner and has a pivotal hole which is located close to an inside of a center of the umbrella, the positioning rib unit has a main rib, the main rib has a second rib pivotably connected to an outer end thereof, the main rib has a positioning hole which is located at an inner end thereof and the first link is pivotably connected to the positioning hole, the main rib and the first link both are pivotably connected to the pivotal hole of the positioning portion. 
     
     
         4 . The umbrella as claimed in  claim 1 , wherein the positioning portion is connected to the top of the runner and has a pivotal hole which is located close to an outside of a center of the umbrella, the positioning rib unit has a main rib, the main rib has a second rib pivotably connected to an outer end thereof, the main rib has a positioning hole which is located at an inner end thereof and the first link is pivotably connected to the positioning hole, the main rib and the first link both are pivotably connected to the pivotal hole of the positioning portion. 
     
     
         5 . The umbrella as claimed in  claim 3 , wherein a first pulling unit is connected between an inner end of the second rib and the first link. 
     
     
         6 . The umbrella as claimed in  claim 4 , wherein a first pulling unit is connected between an inner end of the second rib and the first link. 
     
     
         7 . The umbrella as claimed in  claim 3 , wherein a second pulling unit is connected between the inner end of the main rib and the second link. 
     
     
         8 . The umbrella as claimed in  claim 4 , wherein a second pulling unit is connected between the inner end of the main rib and the second link. 
     
     
         9 . The umbrella as claimed in  claim 5 , wherein the first pulling unit is a V-shaped wire or a pair of straight wires. 
     
     
         10 . The umbrella as claimed in  claim 7 , wherein the second pulling unit is a U-shaped wire or a pair of straight rods. 
     
     
         11 . The umbrella as claimed in  claim 3 , wherein the inner end of the main rib is a V-shaped end. 
     
     
         12 . The umbrella as claimed in  claim 4 , wherein the inner end of the main rib is a V-shaped end. 
     
     
         13 . The umbrella as claimed in  claim 3 , wherein the inner end of the main rib is a flat end. 
     
     
         14 . The umbrella as claimed in  claim 4 , wherein the inner end of the main rib is a flat end. 
     
     
         15 . The umbrella as claimed in  claim 1 , wherein the positioning rib unit has a main rib which is pivotably connected to an inside or outside of the positioning portion. 
     
     
         16 . The umbrella as claimed in  claim 2 , wherein the positioning rib unit has a main rib which is pivotably connected to an inside or outside of the positioning portion. 
     
     
         17 . The umbrella as claimed in  claim 1 , wherein umbrella is a stick umbrella, a two-stage umbrella or a multiple-stage umbrella. 
     
     
         18 . The umbrella as claimed in  claim 1 , wherein umbrella is a manual umbrella, an auto-opening umbrella, an auto-folding umbrella, or an auto-opening/auto-folding umbrella. 
     
     
         19 . The umbrella as claimed in  claim 1 , wherein each of the top of the shaft and the top of the runner has one positioning portion.