Electric vacuum cleaner

Abstract

Provided are rotary brush unit which is disposed inside suction port portion and in which two rotary shaft bodies each having brush are disposed in series and driving motor which separately rotates each of the rotary shaft bodies. With such a configuration, since it is possible to change a self-propelling direction of the suction port portion to the left and right direction in addition to the forward direction, it is possible to remarkably reduce the effort involved in an operation of changing the direction of the suction port portion.

1 . An electric vacuum cleaner comprising:
 a cleaner body portion which has an electric blower for generating a suction wind;   a suction port portion which sucks dust together with the suction wind;   a handle portion which moves the suction port portion;   a rotary brush unit which is disposed inside the suction port portion and in which two rotary shaft bodies each having a brush are disposed in series;   a rotary brush unit driving portion which separately rotates each of the rotary shaft bodies; and   a rotation speed difference generating mechanism which generates a difference in the rotation speed between the two rotary shaft bodies.   
   
   
       2 . The electric vacuum cleaner of  claim 1 ,
 wherein the suction port portion propels itself in accordance with the rotation of the rotary shaft bodies.   
   
   
       3 . The electric vacuum cleaner of  claim 1 ,
 wherein the rotary brush unit driving portion is configured as a driving motor which is disposed inside each of the rotary shaft bodies.   
   
   
       4 . The electric vacuum cleaner of  claim 1 ,
 wherein the handle portion includes a switch lever portion which is operable in the left and right direction, and controls the rotation of the two rotary shaft bodies of the rotary brush unit so that a direction of the suction port portion is changed to the operation direction of the switch lever portion.   
   
   
       5 . The electric vacuum cleaner of  claim 1 ,
 wherein the handle portion is twistable in the left and right direction, and   wherein when the handle portion is twisted in the left and right direction, the rotation of the two rotary shaft bodies of the rotary brush unit is controlled so that a direction of the suction port portion is changed to the twisting direction of the handle portion.   
   
   
       6 . The electric vacuum cleaner of  claim 1 ,
 wherein stiffness of each of the brushes in the vicinity of both ends of the rotary brush unit is set to be harder than that in the vicinity of the center thereof.   
   
   
       7 . The electric vacuum cleaner of  claim 1 ,
 wherein an outer diameter of each of the rotary shaft bodies at both ends of the rotary brush unit is set to be larger than that in the vicinity of the center,   wherein a length of each of the brushes in the vicinity of both ends of the rotary brush unit is set to be shorter than that in the vicinity of the center thereof, and   wherein an outer diameter of each of the brushes up to the end of its bristles in the vicinity of both ends of the rotary brush unit is set to be same as that in the vicinity of the center thereof   
   
   
       8 . The electric vacuum cleaner of  claim 1 ,
 wherein a length of each of the brushes in the vicinity of both ends of the rotary brush unit is set to be longer than that in the vicinity of the center thereof.   
   
   
       9 . The electric vacuum cleaner of  claim 1 ,
 wherein a density of each of the brushes in the vicinity of both ends of the rotary brush unit is set to be higher than that in the vicinity of the center thereof.   
   
   
       10 . The electric vacuum cleaner of  claim 9 ,
 wherein the brushes of the rotary shaft bodies are formed in a comb tooth shape, and a pitch of the comb tooth shape of each of the brushes in the vicinity of both ends of the rotary brush unit is set to be narrower than that in the vicinity of the center thereof.   
   
   
       11 . The electric vacuum cleaner of  claim 9 ,
 wherein the brushes of the rotary shaft bodies are formed in a stripe shape, and the number of lines of the brushes in the vicinity of both ends of the rotary brush unit is set to be larger than that in the vicinity of the center thereof.