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US 2015/0031467 A1Published application
Golf club
AssigneeDunlop Sports Co. 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 We 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)
Claims6
A golf club comprising:
- a head, a shaft, and a grip, wherein:
- a club length is 43 inches or greater and 48 inches or less;
- a ratio (Wh/Wc) between a head weight Wh and a club weight We is equal to or greater than 0.70;
- an inertia moment Ix about a 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);
- and
- a frequency of vibration of the club is 240 (cpm) or greater and 280 (cpm) or less,
- wherein the inertia moment Ix (kg·cm2) is calculated by Equation (1), and the static moment Mt (kg·cm) is calculated by Equation (2):
- Ix=Wc×(Lc+60)2+Ic (1)
- Mt=Wc×(Lc−35.6) (2)
- if the club weight is defined as Wc (kg), an axial direction distance from a grip end to a center of gravity of the club is defined as Lc (cm), and a club inertia moment about the center of gravity of the club is defined as Ic (kg·cm2).
8 more elements
A golf club comprising:
- a head, a shaft, and a grip, wherein;
- a club length is 43 inches or greater and 48 inches or less;
- a ratio (Wh/Wc) between a head weight Wh and a club weight We is equal to or greater than 0.70;
- an inertia moment Ix about a swing axis is 6.90×103 (kg·cm2) or greater and 7.50×103 (kg·cm2) or less;
- and
- a static moment Mt (kg·cm) of the club is equal to or greater than 16.3 (kg·cm),
- wherein the inertia moment Ix (kg·cm2) is calculated by Equation (1), and the static moment Mt (kg·cm) is calculated by Equation (2):
- Ix=Wc×(Lc+60)2+Ic (1)
- Mt=Wc×(Lc−35.6) (2)
- if the club weight is defined as We (kg), an axial direction distance from a grip end to a center of gravity of the club is defined as Lc (cm), and a club inertia moment about the center of gravity of the club is defined as Ic (kg·cm2).
7 more elements
Dependencies are inferred from the claim text.