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US 2015/0087435 A1Published application
Golf club
AssigneeDunlop Sports Co. Ltd.
InventorTakashi NAKAMURA
Life of this patent
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Abstract
A club 2 includes a head 4, a shaft 6 and a grip 8. A club length L1 is equal to or greater than 43 inches and equal to or less than 48 inches. A frequency of the club is equal to or greater than 240 (cpm) and equal to or less than 290 (cpm). A club inertia moment Ix is equal to or greater than 6.90×103 (kg·cm2) and equal to or less than 7.50×103 (kg·cm2). A ratio Iss/Ix is equal to or greater than 0.085 and equal to or less than 0.115. The inertia moment Ix is a club inertia moment about a swing axis Zx. The moment Iss is a shaft inertia moment about the swing axis Zx.
Claims6
A golf club comprising:
- a head, a shaft, and a grip, wherein:
- a club length is equal to or greater than 43 inches and equal to or less than 48 inches;
- a frequency of the club is equal to or greater than 240 (cpm) and equal to or less than 290 (cpm);
- if a shaft inertia moment about a swing axis is defined as Iss (kg·cm2) and a club inertia moment about the swing axis is defined as Ix (kg·cm2), the club inertia moment Ix is equal to or greater than 6.90×103 (kg·cm2) and equal to or less than 7.50×103 (kg·cm2), and a ratio Iss/Ix is equal to or greater than 0.085 and equal to or less than 0.115;
- and
- the inertia moment Ix is calculated by Equation (1), and the inertia moment Iss is calculated by Equation (2):
- Ix=Wc×(Lc+60)2+Ic (1)
- Iss=Ws×(Ls+60)2+Is (2)
- if a 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), a club inertia moment about the center of gravity of the club is defined as Ic (kg·cm2), a shaft weight is defined as Ws (kg), an axial direction distance from the grip end to a center of gravity of the shaft is defined as Ls (cm), and a shaft inertia moment about the center of gravity of the shaft is defined as Is (kg·cm2).
6 more elements
Dependencies are inferred from the claim text.