Evaluation method of golf club and golf club
AssigneeThe Yokohama Rubber Co., Ltd.
InventorsTakayuki Shiraishi, Masayoshi Kogawa, Yoh Nishizawa, Masaki Akie
Life of this patent
Estimating the term…
Abstract
Disclosed is an evaluation method of a golf club, where a rear end portion of a club shaft is vibrated in a state where a tip portion of the club shaft is fastened to measure a frequency per unit time, and a golf club using the club shaft is evaluated based on the frequency.
Claims6
A method for evaluating performance characteristics of a golf club having a club shaft and a club head, comprising the steps of:
- fixing a rear end portion of the club shaft;
- vibrating a tip portion of the club shaft while the rear end portion of the club shaft is fixed;
- measuring frequency per unit time of the vibrating shaft to obtain a first frequency;
- fixing the tip portion of the club shaft;
- vibrating the rear end portion of the club shaft while the tip portion is fixed;
- measuring frequency per unit time of the vibrating shaft to obtain a second frequency;
- applying the club head to the club shaft;
- and
- rating the golf club based on a calculated value of the first and second measured frequencies.
A method for evaluating performance characteristics of a golf club having a club shaft and a club head, comprising the steps of:
- fixing a tip portion of the club shaft;
- vibrating a rear end portion of the club shaft while the tip portion of the club shaft is fixed;
- measuring frequency per unit time of the vibrating shaft;
- applying the club head to the club shaft;
- and
- rating the golf club based on the measured frequency.
A method for evaluating performance characteristics of a golf club having a club shaft and a club head, comprising the steps of:
- fixing a rear end portion of the club shaft;
- vibrating a tip portion of the club shaft while the rear end portion of the club shaft is fixed;
- measuring frequency per unit time of the vibrating shaft to obtain a first frequency;
- fixing the tip portion of the club shaft;
- vibrating the rear end portion of the club shaft while the tip portion is fixed;
- measuring frequency per unit time of the vibrating shaft to obtain a second frequency;
- applying the club head to the club shaft;
- and
- rating the golf club based on a sum of the first and second measured frequencies.
A method for evaluating performance characteristics of a golf club having a club shaft and a club head, comprising the steps of:
- fixing a rear end portion of the club shaft;
- vibrating a tip portion of the club shaft while the rear end portion of the club shaft is fixed;
- measuring frequency per unit time of the vibrating shaft to obtain a first frequency;
- fixing the tip portion of the club shaft;
- vibrating the rear end portion of the club shaft while the tip portion is fixed;
- measuring frequency per unit time of the vibrating shaft to obtain a second frequency;
- applying the club head to the club shaft;
- and
- rating the golf club based on a ratio of the first and second measured frequencies.
Dependencies are inferred from the claim text.