| CPC A63B 53/10 (2013.01) [A63B 53/007 (2013.01); B32B 1/08 (2013.01); B32B 5/02 (2013.01); B32B 15/08 (2013.01); B32B 15/18 (2013.01); B32B 25/10 (2013.01); B32B 2262/103 (2013.01); B32B 2262/106 (2013.01); B32B 2307/732 (2013.01)] | 20 Claims |
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1. A golf club shaft comprising:
a first tubular portion formed from a first material and extending along at least a portion of a length of the golf club shaft;
a second tubular portion coupled to the first tubular portion and extending along the length of the golf club shaft, the second tubular portion having a wall thickness defined by a multilayer arrangement concentric with a bore axis of the golf club shaft, the multilayer arrangement including:
a first layer formed from a second material and defining an outer layer;
a second layer formed from the second material and defining an inner layer;
a third layer formed from the second material and defining an intermediate layer;
a fourth layer formed from a third material and interposed between the first layer and the third layer;
a fifth layer formed from the third material and interposed between the second layer and the third layer; and
a plurality of wires formed from a fourth material and disposed in one or more of the first layer, the second layer, the third layer, the fourth layer, and the fifth layer,
wherein the first, second, third, and fourth materials are different from one another, and
wherein a length of the plurality of wires is less than or equal to a length of the second tubular portion.
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8. A golf club shaft comprising:
a first tubular portion formed from a first material;
a second tubular portion coupled to the first tubular portion, a transverse cross section of the second tubular portion having:
a first layer formed from a second material and defining an outer layer;
a second layer formed from the second material and defining an inner layer;
a third layer formed from the second material and defining an intermediate layer;
a fourth layer formed from a third material and interposed between the first layer and the third layer;
a fifth layer formed from the third material and interposed between the second layer and the third layer; and
a reinforcing structure formed from a fourth material and disposed in or adjacent at least one of the first layer, the second layer, the third layer, the fourth layer, and the fifth layer,
wherein the first, second, third, and fourth materials are different from one another,
wherein a length of the second tubular portion is greater than a length of the first tubular portion, and
wherein the second tubular portion has a mass per unit length equal or about equal to a mass per unit length of the first tubular portion.
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15. A golf club shaft comprising:
a first tubular portion formed from a first material and having a tip end portion and a distal end portion; and
a second tubular portion coupled to the distal end portion of the first tubular portion, the second tubular portion including a butt end portion, and a transverse cross section of the second tubular portion having:
a plurality of layers arranged concentrically about a bore axis of the second tubular portion; and
a reinforcing structure disposed in or adjacent at least one layer of the plurality of layers,
wherein the reinforcing structure is formed from a material that is different from the first material,
wherein each layer of the plurality of layers is formed from a material that is different from the first material and the material of the reinforcing structure,
wherein at least two layers of the plurality of layers are different from one another in material composition, and
wherein a mass per unit length of the first tubular portion and a mass per unit length of the second tubular portion is greater than or equal to 3.10 grams per inch and less than or equal to 3.90 grams per inch.
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