Cleaner

Abstract

A vacuum cleaner having a blade, which rotates, is disclosed. The vacuum cleaner includes a body, a blade attached to a lower end of the body, and a rotating unit attached to the body so as to rotate the blade.

1 . A vacuum cleaner comprising:
 a body of the cleaner;   a blade attached in the vicinity of an inlet at a lower end of the body; and   a rotating unit to rotate the blade.   
   
   
       2 . The cleaner of  claim 1 , wherein the rotating unit rotates the blade toward a surface to be cleaned when a friction force of the surface to be cleaned is smaller than a first friction force between the blade and a carpet, and rotates the blade in a body direction when the friction force of the surface to be cleaned is larger than the first friction force. 
   
   
       3 . The cleaner of  claim 2 , wherein the first friction force is determined as the mean value to friction force values of low-ranking 20% among a plurality of friction force values between a plurality of carpets and the blade. 
   
   
       4 . The cleaner of  claim 1 , further comprising an accommodating space formed in the body, so that the blade is at least partially received therein when the rotating unit rotates the blade in the body direction. 
   
   
       5 . The cleaner of  claim 4 , further comprising a prominence formed in the accommodating space so as to restrict a rotation of the blade when the rotating unit rotates the blade toward the surface to be cleaned. 
   
   
       6 . The cleaner of  claim 1 , wherein the rotating unit comprises:
 a rotating axis formed on the blade;   a coupling hole formed in the body, so that the rotating axis of the blade is inserted therein; and   an elastic member having one end connected to the blade and the other end connected to the body.   
   
   
       7 . The cleaner of  claim 6 , wherein the elastic member has an elastic force less than a first friction force between the blade and a carpet and more than a second friction force between the blade and a floor. 
   
   
       8 . The cleaner of  claim 7 , wherein the second friction force is determined as the mean value to friction force values of high-ranking 20% among a plurality of friction force values between a plurality of floors and the blade. 
   
   
       9 . The cleaner of  claim 6 , wherein the elastic member comprises an elastic force less than a first friction force between the blade and a carpet. 
   
   
       10 . The cleaner of  claim 9 , wherein the elastic member comprises a spiral spring. 
   
   
       11 . The cleaner of  claim 10 , wherein the blade comprises a groove formed thereon, so that the one end of the spiral spring is inserted in the groove. 
   
   
       12 . The cleaner of  claim 1 , wherein the rotating unit comprises:
 a rotating axis rotatably coupled on the body;   a frame formed, so that the blade is attached thereto and having an end fixed on the rotating axis; and   an elastic member having one end connected to the frame and the other end connected to the body.   
   
   
       13 . The cleaner of  claim 12 , wherein the elastic member comprises a spring. 
   
   
       14 . A vacuum cleaner comprising:
 a body of the cleaner; and   a blade attached in the vicinity of an inlet at a lower end of the body, so that an angle of the blade to a surface to be cleaned is adjusted according a magnitude of a friction force between the blade and the surface to be cleaned.   
   
   
       15 . The cleaner of  claim 14 , wherein the blade is rotated in a direction perpendicular to the surface to be cleaned when the friction force of the surface to be cleaned is smaller than a first friction force between the blade and a carpet, and the blade is rotated in a body direction when the friction force of the surface to be cleaned is larger than the first friction force. 
   
   
       16 . The cleaner of  claim 14 , further comprising an accommodating space formed in the body, so that the blade is, at least partially, received therein when the blade is rotated in a body direction. 
   
   
       17 . The cleaner of  claim 16 , further comprising a prominence formed in the accommodating space so as to restrict a rotation of the blade when the blade is rotated in a direction perpendicular to the surface to be cleaned. 
   
   
       18 . The cleaner of  claim 14 , wherein the cleaner is a robot vacuum cleaner.