Golf club shaft formed of tubular bodies different in flexibility

Abstract

A golf club shaft is formed of an upper tubular body and a lower tubular body, which are different in flexibility from each other and are coaxially coupled by a connection rod in conjunction with a washer.

What is claimed is:  
     
         1 . A golf club shaft comprising: 
 an upper tubular body of a tapered construction;    a washer in contact with a top of said upper tubular body, said washer having an outer diameter equal to an outer diameter of said tip of said upper tubular body;    a lower tubular body of a tapered construction and having a large and outer diameter equal to said outer diameter of said washer, said lower tubular body being smaller in length than said upper tubular body and being different in flexibility from said upper tubular body, said lower tubular body further being coaxially coupled with said upper tubular body such that said large end of said lower tubular body is in contact with said washer; and    a connection rod coupling said upper tubular body and said lower tubular body such that said connection rod is put through a center of said washer, and that two ends of said connection rod are respectively inserted into said upper tubular body and said lower tubular body.    
     
     
         2 . The golf club shaft as defined in  claim 1 , wherein said upper tubular body is made of a carbon fiber material and is reinforced by filaments of a metal; wherein said lower tubular body is made of the carbon fiber material and is greater in flexibility than said upper tubular body.  
     
     
         3 . The golf club shaft as defined in  claim 1 , wherein said upper tubular body is made of a carbon fiber material; wherein said lower tubular body is made of the carbon fiber material and is reinforced by filaments of a metal, said lower tubular body being smaller in flexibility than said upper tubular body.  
     
     
         4 . The golf club shaft as defined in  claim 1 , wherein said washer is made of aluminium.  
     
     
         5 . The golf club shaft as defined in  claim 1 , wherein said connection rod is made of a resilient steel.  
     
     
         6 . The golf club shaft as defined in  claim 1 , wherein said connection rod is provided in periphery with a knurled portion and is fastened at both ends thereof with said upper tubular body and said lower tubular body by an adhesive.  
     
     
         7 . The golf club shaft as defined in  claim 1 , wherein said connection rod is provided with a trench extending along the direction of a longitudinal axis of said connection rod.