| 摘要 |
<p>PURPOSE: To reduce vibration wave brought when hitting a ball and increase the repulsive force brought when hitting a ball, by separately arranging the upper shaft part, the recessed part, and the lower shaft part from the upper end to the lower end in the hollow shaft made of a reinforced carbon fiber composite material. CONSTITUTION: An upper shaft part 3, a recessed part 4, and a lower shaft part 5 are arranged from the upper end to the lower end of the shaft made of a reinforced carbon fiber composite material. The outer diameter of the upper shaft 3 is contracted from the upper side to the lower side to form a gentle taper and a grip 31 is arranged at the upper end of the upper shaft 3. A first swelled part 32 largely expanded at the outer diameter is formed near the lower end of the upper shaft 3. And further, the outer diameter of the lower shaft part 5 is contracted from the upper side to the lower side to form a gentle taper, and a club head 51 is fixed to the lower end. And a second swelled part 52 largely expanded at the outer diameter is formed near the upper end and the recessed part 4 is formed oppositely between the first swelled part 32 and the second swelled part 52 by a dent 41 gradually contracted at the outer diameter.</p> |
