Patent ID: 9717967
Date: 2017-08-01
CPC Classifications: A63B,G06F,G09B

Claim:
1. A tennis racket fitting method for selecting a suitable tennis racket for a particular user, the method comprising: a first step of preparing a plurality of test tennis rackets, at least one type of racket property that influences swing for hitting a ball being defined for each of the plurality of test tennis rackets, and setting index values by quantifying the at least one type of racket property for each of the plurality of test tennis rackets; a second step of making the particular user swing a reference tennis racket at least one time in order to hit a tennis ball, and obtaining a measured value by measuring transition in selected one or more of the position, the velocity, the acceleration, and the angular velocity of the reference tennis racket in at least a portion of an interval from when the swing starts until when the swing ends, the reference tennis racket being not included in the plurality of test tennis rackets; a third step of calculating at least one evaluation indicator to be an evaluation of the swing of the reference tennis racket based on the measured value, the at least one evaluation indicator being different from the at least one type of racket property but being subjected to a magnitude of the at least one type of racket property; and a fourth step of referring to the calculated at least one evaluation indicator of the reference tennis racket in the third step and the index values of the plurality of test tennis rackets set in the first step, and selecting one of the plurality of test tennis rackets for said particular user based on a predetermined correlation between the at least one type of racket property and the at least one evaluation indicator, without having the particular user swing any of the plurality of test tennis rackets before the selection, wherein the selection in the fourth step is resulted from an evaluation that the at least one evaluation indicator of the selected one of the plurality of test tennis rackets would be improved compared to the at least one evaluation indicator of the reference tennis racket calculated in the third step, and the selected one of the plurality of test tennis rackets is for the particular user to be test swung after being selected.