Windproof umbrella having multiple canopies in a partial covering relation therebetween

Abstract

A windproof umbrella comprising a lower canopy including a central opening, an intermediate canopy in a partial covering relation to the lower canopy and including a central opening, and an upper canopy in a partial covering relation to the intermediate canopy. Two sets of gaps are temporarily formed between lower and intermediate canopies and between intermediate and upper canopies during high winds because wind caught beneath the canopies will apply pressure upward to force both the intermediate canopy to lift away from the lower canopy for wind escape and the upper canopy to lift away from the intermediate canopy for wind escape respectively.

What is claimed is:  
     
         1 . A windproof umbrella comprising: 
 a lower canopy including a central opening, an upper peripheral edge, and a lower peripheral edge;    an intermediate canopy in a partial covering relation to the lower canopy and including a central opening, an upper peripheral edge, and a lower peripheral edge;    an upper canopy in a partial covering relation to the intermediate canopy and including a lower peripheral edge;    a shank;    a first ring slidable along the shank;    a plurality of ribs;    a plurality of spreaders secured between the first ring and predetermined positions of the ribs;    a hub at a top of the shank;    wherein two sets of a plurality of gaps are temporarily formed between the lower and the intermediate canopies and between the intermediate and the upper canopies during high winds as wind caught beneath the canopies will apply pressure upward to force both the intermediate canopy to lift away from the lower canopy a predetermined distance to provide paths through one set of the gaps for the wind to escape the umbrella and the upper canopy to lift away from the intermediate canopy a predetermined distance to provide paths through the other set of the gaps for the wind to escape the umbrella respectively.    
     
     
         2 . The windproof umbrella of  claim 1 , further comprising: 
 a lower fastening means for securing each lower corner of the lower canopy along its lower peripheral edge to a free end of the rib;    an intermediate fastening means for securing each lower corner of the intermediate canopy along its lower peripheral edge and also each upper portion of the lower canopy  10  along the upper peripheral edge  13  to an about central portion of the rib; and    an upper fastening means for securing each corner of the upper canopy along its lower peripheral edge to an upper portion of the intermediate canopy adjacent either side of the rib.    
     
     
         3 . The windproof umbrella of  claim 1 , further comprising: 
 a second ring between the ring and the hub; and    a plurality of strips, each of strip interconnecting between the second ring and each sector of upper corners of the upper peripheral edge of the lower canopy;    wherein an opening is formed in each sector of the upper peripheral edge of the lower canopy so that a plurality of openings are in fluid communication with a plurality of gaps formed between the lower canopy and the intermediate canopy during high winds.    
     
     
         4 . The windproof umbrella of  claim 3 , further comprising: 
 a lower fastening means for securing each lower corner of the lower canopy along its lower peripheral edge to a free end of the rib;    an intermediate fastening means for securing each lower corner of the intermediate canopy along its lower peripheral edge and also each upper portion of the lower canopy along the upper peripheral edge to an about central portion of the rib; and    an upper fastening means for securing each corner of the upper canopy along its lower peripheral edge to an upper portion of the intermediate canopy adjacent either side of the rib.    
     
     
         5 . The windproof umbrella of  claim 3 , wherein an orientation of each strip is about ±30 degrees with respect to a horizontal direction.  
     
     
         6 . The windproof umbrella of  claim 3 , wherein the strips are inelastic.