Shaft structure of foldable umbrella

Abstract

The present invention relates to an umbrella and includes a cover, a shaft of multi-sectional tubes, a notch, a runner, main ribs, and stretchers. A fixed sleeve is disposed outside an engaging complex that is disposed on the top portion of a sectional tube of the shaft having the smallest diameter, thereby enabling the engaging complex to slide up or down inside the fixed sleeve. The notch connects with an upper end of the fixed sleeve and the runner is disposed outside the fixed sleeve thereby enabling the runner to slide up or down outside the fixed sleeve. The fixed sleeve of this invention forms an elongated and strengthened part of the shaft to firmly support the umbrella when opened and stores multiple or all sectional tubes of the shaft when fully collapsed.

1 . A multi-sectional shaft structure of an umbrella comprises a cover, a shaft formed of multi-sectional tubes, a notch, a runner, a plurality of main ribs and stretchers, wherein the notch pivotally connects with main ribs to support the cover, and the runner pivotally connects with stretchers to support said main ribs; a fixed sleeve is disposed outside an engaging complex that is disposed on the top portion of a sectional tube of the shaft having the smallest diameter enabling the engaging complex to slide up or down inside the fixed sleeve; the notch further connects with an upper end of the fixed sleeve and the runner is disposed outside the fixed sleeve enabling the runner to slide up or down outside the fixed sleeve to open or collapse the umbrella.  
     
     
         2 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein an opening or a spring-loaded stop is disposed on the fixed sleeve to secure and support the runner enabling the shaft to firmly support the umbrella when in opened position.  
     
     
         3 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein the fixed sleeve and the notch are integrally formed.  
     
     
         4 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein the fixed sleeve and the notch are separately formed before assembly.  
     
     
         5 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein the fixed sleeve and the engaging complex can be in the form of a cylinder, a rectangular solid, an ellipsoid, or a polyhedron.  
     
     
         6 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein an opening and a groove are disposed on the engaging complex, with a spring and a button disposed in the opening thereof; a locking hole corresponding to the button and a locking flake corresponding to the groove are disposed on the fixed sleeve enabling the locking flake to lock the groove of the engaging complex and the button spring out to secure at the locking hole of the fixed sleeve when extending the shaft, thereby the engaging complex firmly connects with the fixed sleeve.  
     
     
         7 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein the fixed sleeve and the engaging complex can be applied to various automatic umbrellas.  
     
     
         8 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein an engaging complex disposed with a connection section, corresponding to a fixed sleeve formed above and a cylinder formed beneath; an opening formed on the engaging complex having a spring and a button secured therein; a locking hole corresponding to the button and a cylinder section being engaged with the cylinder thereby inserting into a lower portion of the fixed sleeve.  
     
     
         9 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein the fixed sleeve and the engaging complex can be applied to various automatic umbrellas.  
     
     
         10 . The multi-sectional shaft structure of an umbrella as described in  claim 1 , wherein a protruding rim can be formed on a perimeter of the cylinder section to avoid being hurt by the sharp edge when pulling the shaft.