Patent ID: 7169056
Filing Date: 2007-01-30
Classification: A63B

Abstract:
1. A golf club set comprising a plurality of golf clubs in which a golf club head is assembled on a tip portion of a golf club shaft, the plurality of golf clubs having loft angles different in each club number, wherein the plurality of golf clubs include a group of at least three golf clubs having loft angles in a range of 16 degree or more and 41 degree or less, and, when all of the golf clubs in the group are denoted by continuous natural numbers X starting at 1 in order of increasing loft angle from the smallest loft angle and a sum of a first frequency, the first frequency being measured by vibrating a tip portion of a golf club shaft constituting each of the golf clubs in a state that a rear end portion of the golf club shaft is fastened for a length of 178 mm from the rear end and a 200 g weight is loaded on the tip portion for a length of 30 mm from the tip end, and a second frequency, the second frequency being measured by vibrating the rear end portion of the golf club shaft in a state that the tip portion of the golf club shaft is fastened for a length of 178 mm from the tip end and a 200 g weight is loaded on the rear end portion for a length of 30 mm from the rear end, is denoted by Y (cpm), the sum Y of frequencies is determined in a range of the following formula (1) to the natural number X in all of the golf clubs of the group, where coefficients a and b are arbitrary constants and the coefficient a is 24 or more.