Mobile chair base
FIG. 1 is a perspective view of a mobile chair base showing my new design; 
     FIG. 2 is a side elevational view; 
     FIG. 3 is an elevational view showing the side opposite that shown in FIG. 2; 
     FIG. 4 is a bottom plan view; and 
     FIG. 5 is a top plan view thereof.