Auxiliary rolling device of a skateboard

Abstract

An auxiliary rolling device of a skateboard comprises: a base at the bottom side of the skateboard; a brace, being mounted onto the base; a recession, being disposed on the brace; a shaft rack, being protruded from each of the sides of the recession, and a penetrating hole, being disposed each on the shaft rack, and a shaft passes through the penetrating holes such that the shaft is fixed into a position and both of its ends protrudes out of the shaft rack, and a wheel is mounted onto each end of the shaft. A roller wheel is sheathed into the middle section of the shaft, and the external diameter of the roller wheel is smaller than that of the wheel.

What is claimed is:  
     
         1 . An auxiliary rolling device of a skateboard, comprising: 
 a base, being disposed at the bottom side of the skateboard;    a brace, being mounted onto the base;    a recession, being disposed on the brace;    a shaft rack, being protruded from each side of the recession, and a penetrating hole, being disposed each on the shaft rack;    a shaft passes through the penetrating holes such that the shaft is fixed into a position and both ends protrude out of the shaft rack, and a wheel is mounted onto each end of the shaft; and    a roller is sheathed into the middle section of the shaft, and the external diameter of the roller is smaller than that of the wheel.    
     
     
         2 . The auxiliary rolling device of a skateboard as claimed in  claim 1 , wherein said roller being disposed at the brace for the wheel of the skateboard.