Bridgestone Corporation

Bridgestone Tire Company Limited

Ryota Kajita

Hidekimi Inoue

Tasuku Saito

Tsutomu Matsunaga

Sakae Inoue

Masayuki Ohtake

Hirato Shimazaki

Hiroshi Esaki

Golf clubs and of the wood type have a relation between the axis of the shaft and the hitting spot on the head face thereof such that, under the assumption that the relation between the axis of the shaft and the head face both thereof in a plane squarely facing a golfer using the golf clubs is negative when the hitting spot is before the axis in the direction of ball's flight and positive when the hitting spot is after the axis in that direction, the distance y between the axis and hitting spot is greater than -3 mm and this is attributable to bending of the neck of the head, the shaft being straight.

Golf club

A golf club set comprises first and second groups of golf clubs, the first group of clubs being of the wood type and the second group of clubs being of the ion type, each of the clubs in the set comprising a shaft connected to a head at one end of said shaft, each, of the shafts having an axis X passing through the center of the shaft, each of the heads having a sole, a hitting face for hitting a golf ball and a hitting spot which is the point of contact between the striking face and the ball when the sole of the club is squarely set on the playing surface, the hitting face being inclined to define a loft angle, each of the clubs having a distance y which is the distance between the axis X and a vertical axis X' passing through the hitting spot, the axes X and X' lying in a plane perpendicular to the hitting face, the wood type clubs and the iron type clubs each being designated by a number which is a single digit, the greater the loft angle of the club the higher the digit by which the club is designated, and the difference in the distance y between the highest number club in the set of the wood type and the lowest number club in the set of the ion type being less than 10 mm.

Golf club set

A continuous golf club set comprising plural clubs set in the order of club number from a longer driving distance is disclosed. In this set, the club length and the sole width are decreased and the loft and lie are increased in the order of club number. The club length is decreased by 15-30 mm and the sole width decreased by 0-15 mm for each club. The loft is increased by 3.degree.-5.degree. and the lie by 0.degree.-2.degree. in club number order. The set comprises both irons and woods. At least one club of the set has its center of gravity located along a line perpendicular to the club striking face thereof at an inward distance of at least 15 mm therefrom. At least one club of the set has its center of gravity located along a line perpendicular to the club striking face thereof at an inward distance therefrom of between 10 mm and less than 15 mm. At least one club of the set has its gravity located along a line perpendicular to the club striking face thereof at an inward distance of less than 10 mm therefrom.

Set of gold clubs

A golf ball having a large carry having a core, a rubber thread layer and a cover layer, in which the rubber thread is composed of a rubber composition consisting essentially of 100 parts by weight of natural rubber and/or cis-1,4-polyisoprene and 2-20 parts by weight of carbon black.

Growing community of inventors

Matsudo, Japan

Ryota Kajita