Suction brush for vacuum cleaner

Abstract

A suction brush for a vacuum cleaner has a bottom plate rotatably disposed under a cover to contact with a cleaning surface. Even when the rear end of the suction brush separates apart from the cleaning surface during the cleaning operation, the bottom plate maintains the close contact with the cleaning surface by rotating downward, thus enhancing the cleaning efficiency.

1 . A suction brush for a vacuum cleaner, comprising: 
 a cover, and    a bottom plate rotatably connected to the cover, the bottom plate having a suction port through which dust is drawn in from a surface being cleaned, the dust being drawn in by a suction force generated by a vacuum source disposed in a body of the vacuum cleaner.    
     
     
         2 . The suction brush of  claim 1 , further comprising an elastic member disposed between the bottom plate and the cover so as to elastically bias an end of the bottom plate in a predetermined direction.  
     
     
         3 . The suction brush of  claim 2 , further comprising a bottom plate stopper disposed on at least one of the bottom plate and the cover to limit a rotation of the bottom plate.  
     
     
         4 . The suction brush of  claim 3 , further comprising a bottom plate fixing unit disposed between the cover and the bottom plate to selectively fix the bottom plate to the cover.  
     
     
         5 . The suction brush of  claim 4 , wherein the bottom plate fixing unit comprises: 
 a foot switch rotatably disposed in the cover and having an operation knob extending through an opening of the cover and a first locking part; and    a brush plate rotatably disposed in the cover to rotate in association with the foot switch and having a second locking part to lock and unlock the brush plate with the first locking part in a complementary manner.    
     
     
         6 . The suction brush of  claim 5 , further comprising a brush disposed at the brush plate that protrudes between the cover and the bottom plate according to the rotation of the brush plate.  
     
     
         7 . The suction brush of  claim 4 , further comprising foot switch support ribs formed on the cover at a certain interval and having an axis hole connectable with a foot switch rotary axis of the foot switch, 
 wherein at least one of the foot switch rotary axis and the brush plate support ribs is provided with a slope so that the foot switch rotary axis is pressed and inserted into the axis hole.    
     
     
         8 . The suction brush of  claim 4 , further comprising brush plate support ribs formed at the cover at a certain interval and having an axis hole connectable with a brush plate rotary axis of the brush plate, 
 wherein at least one of the brush plate rotary axis and the brush plate support ribs is provided with a slope so that the brush plate rotary axis is pressed and inserted into the axis hole.    
     
     
         9 . The suction brush of  claim 1 , further comprising: 
 a bottom plate rotary axis formed on at least one of the bottom plate and the cover, and    bottom plate support ribs having an axis hole connectable with the bottom plate rotary axis, and the bottom plate support ribs formed on at least one of the cover and the bottom plate corresponding to the bottom plate rotary axis,    wherein at least one of the bottom plate rotary axis and the bottom plate support ribs is provided with a slope so that the bottom plate rotary axis is pressed and inserted into the axis hole.    
     
     
         10 . The suction brush of  claim 1 , further comprising: 
 a wheel and a wheel shaft;    a wheel receiving part formed at a rear of the cover for receiving the wheel and having a shaft hole through which the wheel shaft is inserted;    a locking projection formed on the wheel shaft; and    a locking recess formed at the shaft hole corresponding to the locking projection so that the wheel shaft is inserted into and locked with the shaft hole.    
     
     
         11 . A suction brush for a vacuum cleaner comprising: 
 a cover,    a bottom plate rotatably connected to the cover, the bottom plate having a suction port through which dust is drawn in from a surface being cleaned, the dust being drawn in by a suction force generated by a vacuum source disposed in a body of the vacuum cleaner,    a foot switch rotatably disposed in the cover and having an operation knob extending through an opening of the cover and a first locking part;    a brush plate rotatably disposed in the cover to rotate in association with the foot switch and having a second locking part to lock and unlock the brush plate with the first locking part in a complementary manner, and    a brush disposed at the brush plate protruding between the cover and the bottom plate according to the rotation of the brush plate.