Ball positioning structure

Abstract

A ball positioning structure on which a ball is placed comprises a lower body; an upper body placed on the lower body; a slide device provided in between the lower body and the upper body such that the lower body and the upper body are mutually rotatable; and a plurality of supports each having a top end and a bottom end, the bottom end being disposed on the surface of the upper body to define a receiving space for placing a ball.

What is claimed is:  
     
         1 . A ball positioning structure, comprising: 
 a lower body having a through-hole in the center thereof;    an upper body placed on said lower body having a bore at the center thereof which is in alignment and joined with said through-hole;    a slide device provided in between said lower body and said upper body such that said lower body and said upper body are mutually rotatable; and    a plurality of supports each having a top end and a bottom end, said bottom end being disposed on the surface of the upper body to define a receiving space for placing a ball.    
     
     
         2 . A ball positioning structure as claimed in  claim 1 , further comprising a plurality of links each having two ends arranged at the top end of two adjacent supports.  
     
     
         3 . A ball positioning structure as claimed in  claim 1 , wherein the slide device includes a roller and a shaft fixed into the center of the roller.