Golf club shaft and golf club

Abstract

A golf club shaft includes an outer shaft and an inner shaft disposed in a hollow portion of the outer shaft. A void portion is formed between the outer shaft and the inner shaft. The golf club shaft has a double structure including the outer shaft and the inner shaft. This allows both of the shafts to integrally operate and also allows one of the shafts to primarily operate.

1 . A golf club shaft comprising:
 an outer shaft having a hollow portion; and   an inner shaft disposed in the hollow portion of the outer shaft,   wherein a void portion is formed between the outer shaft and the inner shaft.   
     
     
         2 . The golf club shaft according to  claim 1 , wherein the void portion has a width of approximately 1 mm to approximately 6 mm at a distal end of the golf club shaft. 
     
     
         3 . The golf club shaft according to any one of  claims 1 , wherein a proximal end portion of the outer shaft is connected to a proximal end portion of the inner shaft through a connecting member. 
     
     
         4 . The golf club shaft according to any one of  claims 1 , wherein a vibration absorbing member is disposed in the void portion at a position between a distal end portion of the outer shaft and a distal end portion of the inner shaft. 
     
     
         5 . The golf club shaft according to any one of  claims 1 , wherein the outer shaft has a length equal to a length of the inner shaft. 
     
     
         6 . The golf club shaft according to any one of  claims 1 , wherein the void portion between the outer shaft and the inner shaft has a width larger at the distal end of the golf club shaft than a proximal end thereof. 
     
     
         7 . The golf club shaft according to any one of  claims 1 , wherein the void portion between the outer shaft and the inner shaft has a width smaller at the distal end of the golf club shaft than a proximal end thereof. 
     
     
         8 . The golf club shaft according to any one of  claims 1 , wherein the outer shaft is formed of a fiber-reinforced resin. 
     
     
         9 . A golf club comprising the golf club shaft according to any one of  claims 1 .