Ball surface structure

Abstract

A ball surface structure includes multiple primary bosses each having multiple secondary bosses formed on an outer periphery of the primary boss and arranged in an annular format. Each primary boss has a conical recess defined in the outer periphery of the primary boss so as to increase surface friction with the ground surface.

1 . A ball surface structure comprising: 
 multiple primary bosses each having a conical recess defined in an outer periphery of the primary boss so as to increase surface friction with a ground surface.    
   
   
       2 . The ball surface structure as claimed in  claim 1 , wherein secondary bosses are formed on the outer surface of each of the primary bosses.  
   
   
       3 . The ball surface structure as claimed in  claim 2 , wherein the secondary bosses are annularly formed on the outer periphery of each of the primary bosses.  
   
   
       4 . A ball surface structure comprising: 
 multiple primary bosses each having multiple secondary bosses formed on an outer periphery of the primary boss and arranged in an annular format.    
   
   
       5 . The ball surface structure as claimed in  claim 4 , wherein each primary boss has a conical recess defined in the outer periphery of the primary boss.  
   
   
       6 . The ball surface structure as claimed in  claim 5 , wherein each of the secondary bosses is integrally formed with one another so as to form an annular ring on the outer periphery of the primary bosses.