Upright type vacuum cleaner

Abstract

An upright type vacuum cleaner includes a weight counterbalancing section located at a connective portion for connecting a body of the vacuum cleaner with a brush assembly in a manner that the body and the brush assembly are rotated on each other, for counterbalancing a partial weight of the body when the body is inclined. The weight counterbalancing means includes a pair of shafts formed on both sides of the body; a pair of shaft positioning portions formed on the brush assembly corresponding to the pair of shafts of the body; holders connected to the respective shaft positioning portions for rotatably supporting the shafts positioned on the shaft positioning portions; and torsion springs each of which having one end fixed at each shaft, and the other end fixed at the brush assembly, for elastically supporting the body in a perpendicular relation with respect to the brush assembly. Further, a pair of moving rollers are formed on both rear sides of the brush assembly for smooth movement of the vacuum cleaner. Accordingly, when a user tilts the body of the vacuum cleaner to perform the cleaning operation, a partial weight of the body is supported by the torsion springs, so the user handles less weight, and is less tired even after a long period of cleaning.

What is claimed is:  
     
         1 . An upright type vacuum cleaner comprising: 
 weight counterbalancing means disposed at a connective portion for connecting a body of the vacuum cleaner with a brush assembly in a manner that the body and the brush assembly are rotated on each other, the weight counterbalancing means for counterbalancing a partial weight of the body when the body is inclined; and    a pair of moving rollers formed on both rear sides of the brush assembly.    
     
     
         2 . The upright type vacuum cleaner as claimed in    claim 1   , wherein the weight counterbalancing means comprises: 
 a pair of shafts formed on both sides of the body;    a pair of shaft positioning portions formed on the brush assembly corresponding to the pair of shafts of the body;    holders connected to the respective shaft positioning portions for rotatably supporting the shafts positioned on the shaft positioning portions; and    torsion springs each of which having one end fixed at each shaft, and the other end fixed at the brush assembly, for elastically supporting the body in a perpendicular relation with respect to the brush assembly.    
     
     
         3 . The upright type vacuum cleaner as claimed in    claim 2   , wherein the torsion springs are metal coil springs which are wound in a cylindrical fashion.  
     
     
         4 . The upright type vacuum cleaner as claimed in    claim 2   , wherein the shafts are hollow shafts, and spring holders are disposed in the shafts, while one end of each torsion spring is fixedly fit in a spring fixing groove formed in each of the spring holders.  
     
     
         5 . The upright type vacuum cleaner as claimed in    claim 4   , wherein the other end of each torsion spring is attached between each shaft positioning portion of the brush holder and each holder coupled to the shaft positioning portion.