Gravity training ball having a buffer function

Abstract

A gravity training ball includes a ball core unit having a predetermined weight specification, a buffer unit covering the ball core unit and made of a material having a shock absorbing effect, and an outer cover unit covering the buffer unit. The ball core unit includes an inner bladder defining a receiving space, and a filler received in the receiving space. The inner bladder has an inflation valve for inflation of air into the receiving space. The buffer unit has a thickness ranging from 2 mm to 30 mm. The ball core unit further includes an inner wrapped yarn layer disposed between the inner bladder and the buffer unit. The outer cover unit includes an outer cover layer covering the buffer unit.

What is claimed is: 
     
         1 . A gravity training ball comprising:
 a ball core unit having a predetermined weight specification and including an inner bladder that defines a receiving space, and a filler received in said receiving space, said inner bladder having an inflation valve for inflation of air into said receiving space;   a buffer unit covering said ball core unit and made of a material having a shock absorbing effect, said buffer unit having a thickness ranging from 2 mm to 30 mm; and   an outer cover unit covering said buffer unit;   wherein said ball core unit further includes an inner wrapped yarn layer disposed between said inner bladder and said buffer unit, and said outer cover unit includes an outer cover layer covering said buffer unit.   
     
     
         2 . The gravity training ball as claimed in  claim 1 , wherein the thickness of said buffer unit ranges from 3 mm to 15 mm. 
     
     
         3 . The gravity training ball as claimed in  claim 1 , wherein the thickness of said buffer unit ranges from 3 mm to 12 mm. 
     
     
         4 . The gravity training ball as claimed in  claim 1 , wherein the thickness of said buffer unit ranges from 9 mm to 15 mm. 
     
     
         5 . The gravity training ball as claimed in  claim 1 , wherein the thickness of said buffer unit ranges from 9 mm to 20 mm. 
     
     
         6 . The gravity training ball as claimed in  claim 1 , wherein the thickness of said buffer unit ranges from 10 mm to 25 mm. 
     
     
         7 . The gravity training ball as claimed in  claim 1 , wherein the thickness of said buffer unit ranges from 25 mm to 30 mm. 
     
     
         8 . The gravity training ball as claimed in  claim 1 , wherein said gravity training ball has a total weight of not less than 800 grams.