Composite material bat

Abstract

A composite material bat comprising: a hitting part with a large diameter and a holding part with a smaller diameter. It forms a conical area at the shoulder of where the hitting part and the holding part connects. Wherein the improvement is characterizing in that the holding part includes an inner shell and an outer shell, said inner shell has better rigidity or stiffness then said outer shell and said outer shell has better flexibility then said inner shell.

What the invention claimed is:  
     
         1 . A composite material bat comprising: 
 a hitting part with a large diameter and a holding part with a smaller diameter; it forms a conical area at the shoulder of where the hitting part and the holding part connects; 
 wherein the improvement is characterizing in that  
 said holding part includes an inner shell and an outer shell, said inner shell has better rigidity or stiffness then said outer shell and said outer shell has better flexibility then said inner shell.  
   
     
     
         2 . The composite material bat as claimed in  claim 1 , said outer shell of said holding part made of reinforced fiber thermoplastic.  
     
     
         3 . The composite material bat as claimed in  claim 2 , said inner shell of said holding part made of reinforced fiber thermosetting material or metal.  
     
     
         4 . The composite material bat as claimed in  claim 1 , further comprising a middle cushion layer between said inner shell and said outer shell.  
     
     
         5 . The composite material bat as claimed in  claim 4 , said reinforced fiber thermosetting material made of the base material of epoxy.  
     
     
         6 . The composite material bat as claimed in  claim 1 , further comprising a middle cushion layer between said inner shell and said outer shell.