Golf club
First Claim
1. A golf club comprising a club shaft and a wood-type hollow club head,the club head havinga loft angle of from 14 to 18 degrees,a head volume of not less than 250 cc, anda sweet spot at a vertical distance of from 1 to 5 mm downwards of a face center, andthe club shaft havinga tip end connected to the club head anda butt end on which a grip is disposed, and havinga variable flexural rigidity with a minimum in a range of from 5 to 10 N·
- m2, whereinthe minimum flexural rigidity occurs in a range between 10% and 30% of the length of the club shaft from the tip end of the club shaft, and whereinthe flexural rigidity progressively increases from the position of the minimum flexural rigidity toward the tip end and the butt end such that the flexural rigidity at the tip end becomes more than 20 N·
m2 and the flexural rigidity at the butt end becomes less than 60 N·
m2, and a part where the flexural rigidity is less than 10 N·
m2 extends at least 10% of the shaft length.
2 Assignments
0 Petitions
Accused Products
Abstract
A golf club comprises a club shaft and a hollow club head, wherein the club head has a loft angle of from 14 to 18 degrees, a head volume of not less than 250 cc, and a sweet spot at a vertical distance of from 1 to 5 mm downwards of a face center, and the club shaft has a variable flexural rigidity whose minimum is in a range of from 5 to 10 N·m2, and the minimum flexural rigidity occurs in a range between 0% and 40% of the length of the club shaft from the end of the club shaft.
112 Citations
6 Claims
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1. A golf club comprising a club shaft and a wood-type hollow club head,
the club head having a loft angle of from 14 to 18 degrees, a head volume of not less than 250 cc, and a sweet spot at a vertical distance of from 1 to 5 mm downwards of a face center, and the club shaft having a tip end connected to the club head and a butt end on which a grip is disposed, and having a variable flexural rigidity with a minimum in a range of from 5 to 10 N· - m2, wherein
the minimum flexural rigidity occurs in a range between 10% and 30% of the length of the club shaft from the tip end of the club shaft, and wherein the flexural rigidity progressively increases from the position of the minimum flexural rigidity toward the tip end and the butt end such that the flexural rigidity at the tip end becomes more than 20 N·
m2 and the flexural rigidity at the butt end becomes less than 60 N·
m2, and a part where the flexural rigidity is less than 10 N·
m2 extends at least 10% of the shaft length. - View Dependent Claims (2, 3, 4, 5, 6)
- m2, wherein
Specification
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- Resources
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Current AssigneeSRI Sports Limited (Sumitomo Rubber Industries Limited)
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Original AssigneeSRI Sports Limited (Sumitomo Rubber Industries Limited)
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InventorsNishio, Masayoshi
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Primary Examiner(s)BLAU, STEPHEN LUTHER
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Application NumberUS10/453,513Publication NumberTime in Patent Office1,126 DaysField of Search473345-346, 473/349, 473/314, 473316-323US Class Current473/319CPC Class CodesA63B 2209/00 Characteristics of used mat...A63B 53/0408 characterised by specific d...A63B 53/0412 VolumeA63B 53/0466 wood-type
