Polyurethane ball for games and sports

Abstract

A polyurethane ball for games and sports includes a core portion made of relatively heavy and low-cost materials and in the shape of a regular spherical body, and an outer portion made of a polyurethane material and having a predetermined thickness to enclose the entire core portion. The ball is manufactured by way of centering a pre-molded core portion in a mold and filling the mold with the polyurethane material to produce an integral ball. The materials for the core portion include rubber or foamed rubber, plastics or foamed plastics, or recycled wood materials. A heavy-weight filler, such as powdered calcium carbonate, may be blended into the materials for the core portion, so as to effectively control an overall weight of the polyurethane ball.

What is claimed is:  
     
         1 . A polyurethane ball for games and sports, comprising 
 a core portion and an outer portion;    said core portion being a regular spherical body separately molded from relatively heavy and low-cost materials; and    said outer portion being made of a polyurethane material and having a predetermined thickness to enclose said core portion therein by centering said core portion in a mold and filling said mold with said polyurethane material to produce an integral unit of said core portion and said outer portion.    
     
     
         2 . The polyurethane ball for games and sports as claimed in  claim 1 , wherein said core portion is made of rubber or foamed rubber material.  
     
     
         3 . The polyurethane ball for games and sports as claimed in  claim 1 , wherein said core portion is made of plastics or foamed plastic material.  
     
     
         4 . The polyurethane ball for games and sports as claimed in  claim 1 , wherein said core portion is made of recycled wood materials.  
     
     
         5 . The polyurethane ball for games and sports as claimed in  claim 1 , wherein said core portion includes a heavy-weight filler added and blended into materials for forming said core portion.  
     
     
         6 . The polyurethane ball for games and sports as claimed in  claim 5 , wherein said heavy-weight filler is powdered calcium carbonate.  
     
     
         7 . The polyurethane ball for games and sports as claimed in  claim 1 , wherein said outer portion has a thickness within the range from 5 mm to 20 mm or more.