Golf putter shaft

Abstract

In a putter shaft having a tip end and a butt end, a curvature of the putter shaft is represented by a curvature curve of the putter shaft which increases monotonously from the tip end to the butt end. The curvature curve is defined as a curve showing variation of the curvature in a longitudinal axis direction of the putter shaft in a state where a load acts on the tip end to deform the putter shaft with the putter shaft being fixed at the butt end.

What is claimed is:  
     
         1 . A putter shaft having a tip end and a butt end, wherein a curvature of said putter shaft which is represented by a curvature curve of said putter shaft increases monotonously from said tip end to said butt end; wherein said curvature curve is defined as a curve showing variation of said curvature in a longitudinal axis direction of said putter shaft in a state where a load acts on said tip end to deform said putter shaft with said putter shaft being fixed at said butt end.  
     
     
         2 . The putter shaft according to  claim 1 , wherein said putter shaft is horizontally oriented and fixed at said butt end to form a cantilever before said load acts on said tip end.  
     
     
         3 . The putter shaft according to  claim 1 , wherein said putter shaft comprises a carbon shaft, wherein at least one ply of triaxial woven fabric is wrapped around said putter shaft.  
     
     
         4 . A putter shaft having a tip end and a butt end, wherein a flexural rigidity of said putter shaft which is represented by a flexural rigidity distribution curve of said putter shaft decreases monotonously from said tip end to said butt end, wherein said flexural rigidity distribution curve is defined as a curve showing variation of said flexural rigidity in a longitudinal axis direction of said putter shaft.  
     
     
         5 . The putter shaft according to  claim 4 , wherein said putter shaft comprises a carbon shaft, wherein at least one ply of triaxial woven fabric is wrapped around said putter shaft.  
     
     
         6 . A golf putter comprising said putter shaft according to  claim 1 .  
     
     
         7 . A golf putter comprising said putter shaft according to  claim 4.