GOLF CLUB SHAFT FITTING METHOD
First Claim
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1. A fitting method of a shaft of a golf club for selecting a shaft matching a golfer based on a swing of the golfer, the method comprising the steps of:
- obtaining measurement values from a sensor attached to a grip of a golf club and capable of measuring angular velocities about three axes when a golf ball is hit by the golf club;
determining address, top, and impact of a swing from the measurement values; and
selecting a shaft that matches a golfer through a usage of the following swing characteristic amounts of (a) to (d) obtained from the measurement values;
(a) Amount of change of grip angular velocity in a direction of a wrist cock around the top;
(b) An average value of grip angular velocity in the direction of a wrist cock, from the top to a point during a downswing where a grip angular velocity in the direction of a wrist cock becomes a maximum;
(c) An average value of grip angular velocity in the direction of a wrist cock, from a point during a downswing where a grip angular velocity in the direction of a wrist cock becomes a maximum to the impact;
(d) An average value of grip angular velocity in the direction of a wrist cock, from the top to the impact.
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Abstract
A fitting method of a shaft of a golf club for selecting a shaft matching a golfer based on a swing of the golfer. The method includes the steps of obtaining measurement values from a sensor attached to a grip of a golf club; determining address, top, and impact of a swing from the measurement values; and selecting a shaft that matches a golfer through a usage of the swing characteristic amounts and values.
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Citations
20 Claims
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1. A fitting method of a shaft of a golf club for selecting a shaft matching a golfer based on a swing of the golfer, the method comprising the steps of:
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obtaining measurement values from a sensor attached to a grip of a golf club and capable of measuring angular velocities about three axes when a golf ball is hit by the golf club; determining address, top, and impact of a swing from the measurement values; and selecting a shaft that matches a golfer through a usage of the following swing characteristic amounts of (a) to (d) obtained from the measurement values; (a) Amount of change of grip angular velocity in a direction of a wrist cock around the top; (b) An average value of grip angular velocity in the direction of a wrist cock, from the top to a point during a downswing where a grip angular velocity in the direction of a wrist cock becomes a maximum; (c) An average value of grip angular velocity in the direction of a wrist cock, from a point during a downswing where a grip angular velocity in the direction of a wrist cock becomes a maximum to the impact; (d) An average value of grip angular velocity in the direction of a wrist cock, from the top to the impact. - View Dependent Claims (2, 3, 4, 5)
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6. A fitting method of a shaft of a golf club for selecting a shaft matching a golfer based on a swing of the golfer, the method comprising the steps of:
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obtaining measurement values from a sensor attached to a grip of a golf club and capable of measuring angular velocities about three axes when a golf ball is hit by the golf club; determining address, top, and impact of a swing from the measurement values; and selecting a shaft that matches a golfer through a usage of at least two of the following swing characteristic amounts of (a) to (c) obtained from the measurement values, wherein the above described (a) to (c) are respectively selected so as to correspond to bending stiffnesses of the shaft at three positions of 36 inches, 26 inches, and 6 inches each from a tip end of the shaft, based on a relationship between bending stiffnesses of the shaft and each of the swing characteristic amounts of (a) to (c) created in advance with test-hitting, in each of the positions, each of the swing characteristic amounts is divided into multiple ranges, and bending-stiffness ranges of the shaft are configured so as to correspond to the respective ranges, from the measurement values, the bending-stiffness ranges of the shaft are acquired at positions corresponding to the swing characteristic amounts at at least two positions among three positions of 36 inches, 26 inches, and 6 inches from the tip end of the shaft, and from multiple shafts whose bending stiffnesses are measured in advance at the three positions, a shaft matching a golfer is selected based on the acquired bending-stiffness ranges of the shaft at least two positions; (a) Amount of change of grip angular velocity in a direction of a wrist cock around the top; (b) An average value of grip angular velocity in the direction of a wrist cock, from the top to a point during a downswing where a grip angular velocity in the direction of a wrist cock becomes a maximum; (c) An average value of grip angular velocity in the direction of a wrist cock, from the top to the impact. - View Dependent Claims (7, 8, 9, 10)
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11. A fitting method of a shaft of a golf club for selecting a shaft matching a golfer based on a swing of the golfer, the method comprising the steps of:
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obtaining measurement values from a sensor attached to a grip of a golf club and capable of measuring angular velocities about three axes when a golf ball is hit by the golf club, and measuring a face angle and an approach angle of a head of the golf club immediately before impact; determining timing of top and impact of a swing from the measurement values; and selecting a shaft that matches a golfer, through a usage of at least two swing characteristic amounts of the following (a) to (d) obtained from the measurement values, and the measured face angle and approach angle, wherein a shaft suited for a golfer is preliminarily selected based on the measured face angle and approach angle and on a relation C created using a pre-created correlation R between a hit-ball result and face angle and approach angle immediately before impact, and then a shaft is selected with a usage of the swing characteristic amounts; (a) Amount of change of grip angular velocity in a direction of a wrist cock around the top; (b) An average value of grip angular velocity in the direction of a wrist cock, from the top to a point during a downswing where a grip angular velocity in the direction of a wrist cock becomes a maximum; (c) An average value of grip angular velocity in the direction of a wrist cock, from a point during a downswing where a grip angular velocity in the direction of a wrist cock becomes a maximum to the impact; (d) An average value of grip angular velocity in the direction of a wrist cock, from the top to the impact. - View Dependent Claims (12, 13, 14)
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15. An extraction method of an impact time in a swing for extracting an impact time in a swing based on measurement values from a sensor attached to a grip of a golf club and capable of measuring angular velocities about three axes when a golf ball is hit by the golf club, the method comprising the steps of:
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judging whether or not an angular velocity ω
z about a shaft axis, which is the z axis, in a predetermined time duration in measured data is over range;configuring a first provisional impact time when a judgment of over range is obtained in the step of judging, and configuring a second provisional impact time when a judgment of over range has not been obtained; acquiring three candidates for impact time from respective time-series waveforms of an angular velocity ω
x about an x axis, an angular velocity ω
y about a y axis, and an angular velocity ω
z about a z axis using the configured first or second provisional impact time as a reference; anddetermining impact time in accordance with a predetermined determination criterion from the three candidates for impact time. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification