SHAFT FOR GOLF CLUB AND MANUFACTURING METHOD THEREOF, SHAFT SET FOR GOLF CLUB AND MANUFACTURING METHOD THEREOF, GOLF CLUB AND MANUFACTURING METHOD THEREOF AND GOLF CLUB SET AND MANUFACTURING METHOD THEREOF

摘要

PPROBLEM TO BE SOLVED: To swing golf clubs having different numbers in the same set in similar timing, and eliminate a sense of incongruity from hitting feeling. PSOLUTION: This shaft of a golf club includes: a tip area 5 of the head side; a rear end area 7 of the grip side; and an intermediate area. The tip area 5 decreases in flexural rigidity value as it goes toward the tip, the flexural rigidity of the intermediate area 6 increases as it goes from the tip area 5 to the rear end area 7, and the rear area 7 decreases in flexural rigidity as it goes toward the rear end part. In the golf club set or shaft set including the above shaft, the ratio of the flexural rigidity value in a predetermined position of the tip area 5 to the average value of flexural rigidity values in a predetermined range of the intermediate area 6 of the shaft is equal between the respective numbers, and the ratio of the flexural rigidity value in a predetermined position of the rear end area 7 to the average value of flexural rigidity values in a predetermined range of the intermediate area 6 is equal between the respective numbers. PCOPYRIGHT: (C)2008,JPO&INPIT