Golf club set

摘要

A golf club set comprises golf clubs with different club lengths, each golf club comprising a hollow golf club head, the golf club head with a face portion having a clubface for hitting a ball, the face portion comprising a central thicker portion, a toe-side thinner portion with a thickness smaller than that of the central thicker portion, and a heel-side thinner portion with a thickness smaller than that of the central thicker portion, wherein in a front view of the club head under a standard state, the toe-side thinner portion is provided so that a centroid thereof is placed upward than a center of the clubface, the heel-side thinner portion is provided so that a centroid thereof is placed downward than the center of the clubface.

主权项

1. A golf club set comprising a plurality of golf clubs each with different club length, each golf club comprising a clubshaft and a hollow golf club head attached to an one end of the clubshaft,
the golf club head having a face portion whose front face defines a clubface for hitting a ball, the face portion comprising (a) a central thicker portion provided in a center region thereof, (b) a toe-side thinner portion provided in a toe side of the face portion and having a thickness smaller than that of the central thicker portion, and (c) a heel-side thinner portion provided in a heel side of the face portion and having a thickness smaller than that of the central thicker portion, wherein boundaries of said toe-side thinner portion and said heel-side thinner portion are entirely defined by an outer contour edge of the face portion and portions of the face portion with a thicker wall thickness, wherein said central thicker portion (a) comprises a main portion provided in the center region of the face portion so as to include the center of gravity SG of the clubface and a lower rib extending downwardly from the toe-side of the main portion to a lower edge of an inner surface of the face portion, wherein said heel-side thinner portion (c) includes a part extending toward the lower rib through and below the center of gravity SG of the clubface when viewed from its front, and wherein, in a front view of the club head under a standard state that the golf club head is placed on a horizontal plane so that the center line of the clubshaft inclines at its lie angle within a vertical plane and the clubface inclines at its loft angle with respect to the vertical plane, the toe-side thinner portion (b) is provided so that a centroid thereof is placed upward than a center of the clubface, the heel-side thinner portion is provided so that a centroid thereof is placed downward than the center of the clubface, and as for an angle θA of a first straight line passing through the center of the clubface and the centroid of the toe-side thinner portion with respect to the horizontal plane, and an angle θB of a second straight line passing through the center of the clubface and the centroid of the heel-side thinner portion with respect to the horizontal plane, the longer the club length is, the larger the angles of θA and θB are.