| 摘要 |
A golf club device, more specifically a putter ( 1 ), comprising a head ( 2 ) and a shaft ( 3 ) attached to the head ( 2 ), the free end of the shaft ( 3 ) possibly being provided with a grip, wherein the moment of mass inertia of the head ( 2 ) constitutes less than seventy-nine percent of the total moment of inertia of the putter ( 1 ) when the putter ( 1 ) is rotated about an axis of rotation ( 4 ), which is perpendicular to the longitudinal axis ( 7 ) of the shaft ( 3 ) and about one hundred and twenty centimetres from the longitudinal axis ( 5 ) of the head ( 2 ), and/or wherein the mass of the shaft, including a possible displaceable weight ( 11 ), divided by the length of the shaft is at least one hundred and seventy grams per metre of shaft in a shaft which is up to one metre long, and at least one hundred and ninety grams per metre of shaft in a shaft which is longer than one metre.
|
