Shaft for golf club
AssigneeAcushnet Company
InventorsDustin A. Barksdale, Donald S. Bone, Charles E. Golden, Noah de la Cruz, Steven Scott Ogg, Parker Rosquist
Life of this patent
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Abstract
A shaft for a golf club includes a tip end configured to couple to a golf club head; a butt end opposite to the tip end; and a butt end portion that extends in a butt-to-tip direction from the butt end by at least 50 mm and has an average rate of change of bending stiffness in a tip-to-butt direction, wherein a greatest rate of change of bending stiffness of the shaft in the tip-to-butt direction is at least 2.7 times the average rate of change of bending stiffness of the butt end portion.
Claims20
A shaft for a golf club, comprising:
- a tip end configured to couple to a golf club head;
- a butt end opposite to the tip end;
- and
- a butt end portion that extends in a butt-to-tip direction from the butt end by at least 50 mm and has an average rate of change of bending stiffness in a tip-to-butt direction,
- wherein a greatest rate of change of bending stiffness of the shaft in the tip-to-butt direction is at least 2.7 times the average rate of change of bending stiffness of the butt end portion.
A shaft for a golf club, comprising:
- a tip end configured to couple to a golf club head;
- a butt end opposite to the tip end;
- and
- a butt end portion that extends in the tip-to-butt direction from 800 mm from the tip end to 950 mm from the tip end and has an average rate of change of bending stiffness in the tip-to-butt direction,
- wherein a rate ratio is at least 2.7 and is defined as a ratio of:
- the rate of change of bending stiffness of the shaft in the tip-to-butt direction at any point within a portion of the shaft extending at least 10 mm along the tip-to-butt direction and being centered at a point having a maximum rate of change of bending stiffness;
- to
- the average rate of change of bending stiffness of the butt end portion.
A shaft for a golf club, comprising:
- a tip end configured to couple to a golf club head;
- a butt end opposite to the tip end;
- a tip end portion that extends in a tip-to-butt direction from the tip end by at least 50 mm;
- a butt end portion that extends in a butt-to-tip direction from the butt end by at least 50 mm and has an average rate of change of bending stiffness in a tip-to-butt direction;
- and
- a middle portion between the tip end portion and the butt end portion,
- wherein a rate of change of bending stiffness in the tip-to-butt direction at a point in the middle portion is at least 2.7 times the average rate of change of bending stiffness of the butt end portion, and
- wherein a diameter of the shaft at the tip end is less than 0.300 inches.
Dependencies are inferred from the claim text.