Electric vacuum brush for vacuum cleaners

Abstract

An electric vacuum brush for vacuum cleaners has a vacuum head having a brush roller chamber through which suction air can flow, and a roller brush mounted to rotate in the brush roller chamber and driven by an electric motor. The vacuum head has a working width that is measured at the outside edges, crosswise to the working direction. The brush roller chamber has an opening at the bottom, delimited by parallel vacuum motor edges, which extends essentially over the working width of the brush roller chamber. The electric motor has a power consumption, measured at motor angle, of a maximum of 80 watts, and the vacuum head has a working width of more than 320 mm.

What is claimed is:  
     
         1 . An electric vacuum brush for a vacuum cleaner comprising: 
 (a) a vacuum head having a brush roller chamber through which suction air can flow;    (b) a roller brush rotatably mounted in said brush roller chamber; and    (c) an electric motor for driving said roller brush;    wherein said vacuum head has a working width measured at outside edges of said vacuum head transverse to a working direction;    wherein said brush roller chamber has a bottom with an opening defined by parallel vacuum mouth edges of said brush roller chamber and extending substantially over said working width; and    wherein said electric motor has a maximum power consumption of 80 watts measured at motor idle and said working width of said vacuum head exceeds 320 mm.    
     
     
         2 . The electric vacuum brush according to  claim 1 , wherein said electric motor is a permanent magnet motor.  
     
     
         3 . The electric vacuum brush according to  claim 1 , wherein said vacuum head has a working width of 340 mm to 460 mm.  
     
     
         4 . The electric vacuum brush according to  claim 1 , wherein the electric power consumption of said electric motor is less than 60 watts at idle.  
     
     
         5 . A method of designing an electric vacuum brush for a vacuum cleaner comprising the steps of: 
 (a) providing a vacuum head having a brush roller chamber through which suction air can flow, a roller brush rotatably mounted in the brush roller chamber, and an electric motor for driving the roller brush, said vacuum head having a working width measured at outside edges of said vacuum head transverse to a working direction, said brush roller chamber having a bottom with an opening defined by parallel vacuum mouth edges of said brush roller chamber and extending substantially over said working width;    (b) limiting power consumption of the electric motor at motor idle to a maximum of 80 watts; and    (c) fashioning the vacuum head so that the working width exceeds 320 mm.