Window cleaning device

Abstract

The present invention relates to a window cleaning device including a first cleaner and a second cleaner which are respectively attached on both sides of a window by magnetism. The device includes a first magnetic module included in the first cleaner; a second magnetic module included in the second cleaner; and a wheel part which is provided to at least one among the first and the second cleaner and moves the window cleaning device, wherein the wheel part includes a wheel having a plurality of holes at an external diameter part; a wheel cover made of an elastic material which surrounds the external diameter part of the wheel and generates frictional force by coming in contact with the window; and a wheel bearing which is connected to the wheel and delivers turning force, and a part of the wheel cover is inserted into the holes formed at the external diameter part of the wheel.

1 . A window cleaning device including a first cleaner and a second cleaner which are respectively attached on both sides of a window by magnetism, the window cleaning device comprising:
 a first magnetic module included in the first cleaner;   a second magnetic module included in the second cleaner; and   a wheel part which is provided to at least one among the first and the second cleaner and moves the window cleaning device,   wherein the wheel part includes:   a wheel having a plurality of holes at an external diameter part;   a wheel cover made of an elastic material which surrounds the external diameter part of the wheel and generates frictional force by coming in contact with the window; and   a wheel bearing which is connected to the wheel and delivers turning force, and a part of the wheel cover is inserted into the holes formed at the external diameter part of the wheel.   
     
     
         2 . The window cleaning device of  claim 1 , wherein the external diameter part comprises a plurality of supporting spokes for forming the holes between an outer face and an inner face. 
     
     
         3 . The window cleaning device of  claim 2 , wherein the wheel comprises two outer faces spaced apart from each other to form a groove therebetween. 
     
     
         4 . The window cleaning device of  claim 2 , wherein the external diameter part of the wheel has the inner face extending out of the outer face. 
     
     
         5 . The window cleaning device of  claim 2 , wherein a portion of the wheel bearing is inserted into the inner face of the external diameter part, such that the wheel bearing makes contact with the inner face. 
     
     
         6 . The window cleaning device of  claim 1 , wherein the first cleaner, which is attached on an inner side of the window, comprises at least two wheel parts. 
     
     
         7 . The window cleaning device of  claim 6 , wherein the first cleaner comprises a driver for rotating the wheel part, and
 the second cleaner attached on an outer side of the window moves through magnetic force along the first cleaner.   
     
     
         8 . The window cleaning device of  claim 1 , wherein the wheel cover comprises silicone. 
     
     
         9 . The window cleaning device of  claim 1 , wherein the wheel comprises aluminum. 
     
     
         10 . The window cleaning device of  claim 1 , wherein the wheel is formed through two structures by a double injection molding. 
     
     
         11 . The window cleaning device of  claim 1 , wherein the wheel bearing comprises polyoxymethilene (POM) resin.