Roller foot and an electrical apparatus thereof

Abstract

A roller foot, which can be mounted on the bottom of an electrical apparatus, includes a housing, a wheel axle and a wheel. The housing has a top frame, a left frame and a right frame. A right axle hole and a left axle hole are mounted on the inner surface of the right frame and the left frame respectively. The wheel axle is pivotally configured in the left axle hole and the right axle hole. The vertical size of each of the left axle hole and the right axle hole is larger than the wheel axle such that the wheel axle can be moved relative to the center of the left axle hole and the right axle hole. The wheel has a wheel axle hole. The wheel axle is configured in the wheel axle hole.

1 . A roller foot mounted on an electrical apparatus, the roller foot comprising: 
 a housing mounted on the bottom of the electrical apparatus, the housing comprising: 
 a left axle hole mounted on the inner surface of the left side wall of the housing; and  
 a right axle hole mounted on the inner surface of the right side wall of the housing;  
   a wheel axle pivotally configured in the left axle hole and the right axle hole wherein the vertical size of each of the left axle hole and the right axle hole is larger than the wheel axle such that the wheel axle is moved relative to the center of the left axle and the right axle; and    a wheel having a wheel axle hole wherein the wheel axle is configured in the wheel axle hole whereby the wheel is stopped by the top side wall of the housing because of the weight of the electrical apparatus when the electrical apparatus is stationary, and the wheel departs from the top side wall and rolls because a side of the electrical apparatus is lifted when the apparatus is moved.    
   
   
       2 . The roller foot of  claim 1 , wherein the left axle hole and the right axle hole are elliptic and the major axis of each of the left axle hole and the right axle hole is along a vertical direction.  
   
   
       3 . The roller foot of  claim 1 , wherein the left axle hole and the right axle hole are rectangular.  
   
   
       4 . The roller foot of  claim 1 , wherein the left axle hole and the right axle hole are rhomboidal.  
   
   
       5 . The roller foot of  claim 1 , wherein the left axle hole and the right axle hole are triangular.  
   
   
       6 . The roller foot of  claim 1 , wherein the left axle hole and the right axle hole are circular.  
   
   
       7 . The roller foot of  claim 1 , wherein the shape of the left axle hole and the shape of the right axle hole are the same.  
   
   
       8 . The roller foot of  claim 1 , wherein the size of the left axle hole and the size of the right axle hole are the same.  
   
   
       9 . An electrical apparatus comprising: 
 a base; and    at least one roller foot mounted on the bottom of the base, the roller foot comprising: 
 a housing mounted on the bottom of the base, the housing comprising: 
 a top frame positioned on the top of the housing;  
 a left frame positioned on the left of the top frame and extending downward wherein the left frame has a left axle hole on the inner surface of the left frame; and  
 a right frame positioned on the right of the top frame and extending downward wherein the right frame has a right axle hole on the inner surface of the right frame;  
 
 a wheel axle pivotally configured in the left axle hole and the right axle hole wherein the vertical size of each of the left axle hole and the right axle hole is larger than the wheel axle such that the wheel axle is moved relative to the center of the left axle hole and the right axle hole; and  
 a wheel having a wheel axle hole wherein the wheel axle is configured in the wheel axle hole whereby the wheel is stopped by the top frame because of the weight of the electrical apparatus when the electrical apparatus is stationary, and the wheel departs from the top frame and rolls because a side of the apparatus is lifted when the electrical apparatus is moved.  
   
   
   
       10 . The electrical apparatus of  claim 9 , wherein the left axle hole and the right axle hole are elliptic and the major axis of each of the left axle hole and the right axle hole are along a vertical direction.  
   
   
       11 . The electrical apparatus of  claim 9 , wherein the left axle hole and the right axle hole are rectangular.  
   
   
       12 . The electrical apparatus of  claim 9 , wherein the left axle hole and the right axle hole are rhomboidal.  
   
   
       13 . The electrical apparatus of  claim 9 , wherein the left axle hole and the right axle hole are triangular.  
   
   
       14 . The electrical apparatus of  claim 9 , wherein the left axle hole and the right axle hole are circular.  
   
   
       15 . The electrical apparatus of  claim 9 , wherein the shape of the left axle hole and the shape of the right axle hole are the same.  
   
   
       16 . The electrical apparatus of  claim 9 , wherein the size of the left axle hole and the size of the right axle hole are the same.  
   
   
       17 . The electrical apparatus of  claim 9 , further comprising at least one slip resistance mounted on the bottom of the base for preventing the electrical apparatus from slipping.  
   
   
       18 . The electrical apparatus of  claim 17 , wherein the slip resistance has a surface with a high static friction coefficient.  
   
   
       19 . The electrical apparatus of  claim 9 , further comprising at least one pad mounted on the bottom of the base to prevent the electrical apparatus from damage.  
   
   
       20 . The electrical apparatus of  claim 19 , wherein the pad has a surface with a low friction coefficient.