Rubber ball for physical training, warm-up exercise, and physiotherapy

Abstract

A rubber ball designed for physical training, warm-up exercise, and physiotherapy, having an inflatable bladder and a laminated covering covered on the periphery of the bladder, the laminated covering being formed by: adhering a plurality of rubber strips to the bladder and then treating the rubber strips with a vulcanization process, the laminated covering being thicker and harder than the bladder.

What the invention claimed is:  
     
         1 . A rubber ball comprising an inflatable bladder, and a laminated covering covered on the periphery of said bladder, said laminated covering comprised of a plurality of rubber strips adhered to said bladder and then treated with a vulcanization process, said laminated covering being harder than said bladder, the wall thickness of said laminated covering being over multiple times of wall thickness of said bladder.  
     
     
         2 . The rubber ball of  claim 1  wherein said laminated covering has a coarse outside wall.