Articulative extension pipe of vacuum cleaner

Abstract

An articulative extension pipe for a vacuum cleaner has a first extension pipe having a joint, a second extension pipe having a joint receiving part in which a joint of the first extension pipe is inserted, a sealing cover enclosing the first and the second extension pipes, and a locking button disposed between the sealing cover and the first extension pipe, and having at least one coupling protrusion on the outer circumference. One of the sealing cover, and the first and the second extension pipes has at least one coupling recess in which the coupling protrusion of the locking button is selectively inserted so that the first extension pipe can rotate with respect to the second extension pipe. The sealing cover further includes a wheel, which rolls in contact with the surface being cleaned, and a cotton flannel is disposed on the outer circumference of the wheel.

1 . An articulative extension pipe for a vacuum cleaner, comprising: 
 a first extension pipe having a joint;    a second extension pipe having a joint receiving part in which the joint of the first extension pipe is inserted;    a sealing cover enclosing the first and the second extension pipes; and    a locking button disposed between the sealing cover and the first extension pipe, and having at least one coupling protrusion on the outer circumference, wherein    one of the sealing cover, and the first and the second extension pipes has at least one coupling recess in which the at least one coupling protrusion of the locking button is selectively inserted so that the first extension pipe can rotate with respect to the second extension pipe.    
   
   
       2 . The articulative extension pipe of  claim 1 , further comprising an elastic member disposed between the locking button and the first extension pipe, to elastically bias the locking button to a direction away from the first extension pipe.  
   
   
       3 . The articulative extension pipe of  claim 2 , wherein the sealing cover comprises a button hole through which a part of the locking button can protrude.  
   
   
       4 . The articulative extension pipe of  claim 3 , wherein the coupling recess comprises a plurality of spaces defined among a plurality of protrusions of the sealing cover and the first extension pipe.  
   
   
       5 . The articulative extension pipe of  claim 4 , wherein the coupling recess comprises: 
 a first coupling recess formed on the circumference of a button hole of the sealing cover; and    a second and a third coupling recesses formed on a position corresponding to the first coupling recess on a joint of the first extension pipe.    
   
   
       6 . The articulative extension pipe of  claim 5 , wherein the third coupling recess comprises a plurality of linear protrusions.  
   
   
       7 . The articulative extension pipe of  claim 1 , wherein the sealing cover further comprises a wheel which rolls in contact with the surface being cleaned.  
   
   
       8 . The articulative extension pipe of  claim 7 , wherein a cotton flannel is disposed on the outer circumference of the wheel.  
   
   
       9 . An articulative extension pipe for a vacuum cleaner, comprising: 
 a first extension pipe having a joint part;    a second extension pipe having a joint receiving part, said joint receiving part receiving said joint part so that said first and second pipe extensions are in fluid communication with one another and said first extension pipe can rotate with respect to said second extension pipe;    a sealing cover enclosing said first and the second extension pipes; and    a locking button disposed between said sealing cover and said first extension pipe for selectively allowing said first extension pipe to rotate with respect to said second extension pipe.    
   
   
       10 . The articulative extension pipe of  claim 9 , wherein said locking button has at least one coupling protrusion on an outer circumference and said sealing cover has at least one coupling recess in which said at least one coupling protrusion of the locking button is selectively inserted so that said first extension pipe is locked in position with respect to the second extension pipe.  
   
   
       11 . The articulative extension pipe of  claim 10 , further comprising a spring disposed between said locking button and said first extension pipe to bias said locking button to a direction away from said first extension pipe so that said spring biases said at least one coupling protrusion in said at least one coupling recess.  
   
   
       12 . The articulative extension pipe of  claim 10 , wherein said first extension pipe further comprises at least one coupling recess receiving said at least one coupling protrusion of the locking button.  
   
   
       13 . The articulative extension pipe of  claim 9 , further comprising a wheel that rolls in contact with a surface being cleaned, said wheel being disposed at said sealing cover.