Golf club head
First Claim
1. A golf club head havinga face portion,a crown portion forming a head upper surface, anda sole portion forming a head bottom surface, and whereina thickness of the face portion is not more than 2.7 mm,a thickness of the crown portion is not more than 0.9 mm,a thickness of the sole portion is not more than 1.0 mm, andthe head, when mounted on a horizontal surface to have a set lie angle and face angle, with a vertical cross section passing through a center of the face portion and being perpendicular to the face surface and said horizontal surface, has (1) a smallest radius of curvature of an outer surface in the crown portion of not less than 500 mm, measured at the vertical cross section, and (2) a smallest radius of curvature of an outer surface in the sole portion of not less than 1000 mm, measured at the vertical cross section, and whereina frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with a vibrator method is between 600 and 1200 Hz, a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by placing the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 Hz, and a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0.
4 Assignments
0 Petitions
Accused Products
Abstract
A golf club head in which a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with an vibrator method is between 600 and 1200 (Hz), and a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by making the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 (Hz).
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Citations
17 Claims
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1. A golf club head having
a face portion, a crown portion forming a head upper surface, and a sole portion forming a head bottom surface, and wherein a thickness of the face portion is not more than 2.7 mm, a thickness of the crown portion is not more than 0.9 mm, a thickness of the sole portion is not more than 1.0 mm, and the head, when mounted on a horizontal surface to have a set lie angle and face angle, with a vertical cross section passing through a center of the face portion and being perpendicular to the face surface and said horizontal surface, has (1) a smallest radius of curvature of an outer surface in the crown portion of not less than 500 mm, measured at the vertical cross section, and (2) a smallest radius of curvature of an outer surface in the sole portion of not less than 1000 mm, measured at the vertical cross section, and wherein a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with a vibrator method is between 600 and 1200 Hz, a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by placing the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 Hz, and a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0.
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10. A golf club head having a hollow, metallic structure comprising a face portion, a crown portion forming a head upper surface, and a sole portion forming a head bottom surface, wherein
the head has a frequency F(fix) of a primary minimum value of a frequency transfer function of between 600 and 1200 Hz obtained by firmly fixing the head to a vibrator and measured in accordance with an vibrator method, and a frequency F(free) of a primary minimum value of a frequency transfer function of between 2500 and 4000 Hz obtained by placing the head in a free state and measured in accordance with an impact hammer method, and wherein the head when mounted on a horizontal surface to have a set lie angle and face angle, with a vertical cross section passing through a center of the face portion and being perpendicular to the face surface and said horizontal surface, has a ratio of a smallest radius of curvature of an outer surface in the crown portion, measured at the vertical cross section, to a smallest radius of curvature of an outer surface in the sole portion, measured at the vertical cross section, in the range of 0.4 to 0.6.
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14. A golf club head having
a face portion, a crown portion forming a head upper surface, and a sole portion forming a head bottom surface, and wherein the face portion has a thickness of not more than 2.7 mm, the crown portion has a thickness of not more than 0.9 mm, and the sole portion has a thickness of not more than 1.0 mm, and wherein a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with a vibrator method is between 600 and 1200 Hz, a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by placing the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 Hz, and a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0.
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17. A golf club head in which a frequency F (fix) indicating a primary minimum value of a frequency transfer function of a head obtained by firmly fixing the head to a vibrator and measured in accordance with an vibrator method is between 600 and 1200 Hz, a frequency F (free) indicating a primary minimum value of a frequency transfer function of the head obtained by placing the head in a free state and measured in accordance with an impact hammer method is between 2500 and 4000 Hz, and a ratio F (free)/F (fix) between said frequency F (fix) and said frequency F (free) is between 4.2 and 6.0, and wherein
the golf club head is formed substantially from a metallic alloy, and the golf club head has a crown portion having a thickness of not more than 0.9 mm.
Specification
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- Resources
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Current AssigneeSumitomo Rubber Industries Limited
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Original AssigneeSRI Sports Limited (Sumitomo Rubber Industries Limited)
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InventorsSetokawa, Hiroto, Ohnuki, Masahide, Tsunoda, Masaya, Kakiuchi, Hisashi
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Primary Examiner(s)Chiu, Raleigh W.
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Application NumberUS10/321,682Publication NumberTime in Patent Office1,434 DaysField of Search473/324, 473/345, 473/349, 473/350US Class Current473/324CPC Class CodesA63B 53/0408 characterised by specific d...A63B 53/0466 wood-typeA63B 60/42 Devices for measuring, veri...
