Golf club
AssigneeSumitomo Rubber Industries, Ltd.
InventorTakashi Nakamura
Life of this patent
Estimating the term…
Abstract
A club includes a head, a shaft, and a grip. A club length L1 is 43 inches or greater and 48 inches or less. A ratio (Wh/Wc) between a head weight Wh and a club weight Wc is equal to or greater than 0.70. An inertia moment Ix about swing axis is 6.90×103 (kg·cm2) or greater and 7.50×103 (kg·cm2) or less. A static moment Mt (kg·cm) of the club is equal to or greater than 16.3 (kg·cm). The frequency of vibration of club is 240 (cpm) or greater and 280 (cpm) or less. The inertia moment Ix (kg·cm2) is calculated by Equation (1): Ix=Wc×(Lc+60)2+Ic (1).
Claims20
A golf club comprising:
- a head having a head weight defined as Wh (kg);
- a shaft comprising a grip end, a tip end opposite of the grip end, and a shaft axis extending in an axial direction;
- a grip;
- a club weight defined as Wc (kg);
- an axial direction distance between the grip end of the shaft and a center of gravity of the golf club defined as Lc (cm);
- a club inertia moment about the center of gravity of the golf club Ic (kg·cm2);
- an inertia moment about a swing axis Ix (kg·cm2) calculated by formula (1):
- Ix=Wc×(Lc+60)2+Ic (1);
- and
- a static moment defined as Mt (kg·cm) and calculated by the following formula (2):
- Mt=Wc×(Lc−35.6) (2),
- wherein:
- Mt is greater than or equal to 16.7 kg cm;
- and
- a ratio Ix/Mt is equal to or less than 442 cm.
A golf club comprising:
- a head having a head weight defined as Wh (kg);
- a shaft comprising a grip end, a tip end opposite of the grip end, and a shaft axis extending in an axial direction;
- a grip;
- a club weight defined as Wc (kg);
- a club length greater than or equal to 43 in and less than or equal to 48 in;
- an axial direction distance between the grip end of the shaft and a center of gravity of the golf club defined as Lc (cm);
- a club inertia moment about the center of gravity of the golf club Ic (kg·cm2);
- an inertia moment about a swing axis Ix (kg·cm2) calculated by formula (1):
- Ix=Wc×(Lc+60)2+Ic (1), and
- a static moment defined as Mt (kg·cm) and calculated by the following formula (2):
- Mt=Wc×(Lc−35.6) (2),
- wherein:
- Mt is greater than or equal to 16.7 kg·cm;
- and
- a ratio Ix/Mt is equal to or less than 442 cm.
A golf club comprising:
- a head having a head weight defined as Wh (kg) and a volume greater than or equal to 420 cc;
- a shaft comprising a grip end, a tip end opposite of the grip end, and a shaft axis extending in an axial direction;
- a grip;
- a club weight defined as Wc (kg);
- an axial direction distance between the grip end of the shaft and a center of gravity of the golf club defined as Lc (cm);
- a club inertia moment about the center of gravity of the golf club Ic (kg·cm2);
- an inertia moment about a swing axis Ix (kg·cm2) calculated by formula (1):
- Ix=Wc×(Lc+60)2+Ic (1);
- and
- a static moment defined as Mt (kg·cm) and calculated by the following formula (2):
- Mt=Wc×(Lc−35.6) (2),
- wherein:
- Mt is greater than or equal to 16.7 kg·cm;
- and
- a ratio Ix/Mt is equal to or less than 442 cm.
Dependencies are inferred from the claim text.