US 2021/0268346 A1Published application

Golf club head

AssigneeSumitomo Rubber Industries, Ltd.

InventorsTakashi NAKAMURA, Satoru HANAMITSU, Shimpei OYAMA, Yuki NAGANO, Naoyoshi UEDA, Masahiko UEDA

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Abstract

In a head, a center vertical cross section passing through a face center satisfies the following (a) and (b): (a) when a boundary point between an inner surface of a crown portion and an inner surface of a face portion is defined as a CF inner surface boundary point, a curvature radius of a head inner surface at the CF inner surface boundary point is 6.0 mm or greater and 10.0 mm or less, and the head thickness at the CF inner surface boundary point is 2.0 mm or greater; and (b) when a spot located 10 mm apart from the CF inner surface boundary point toward the crown side is defined as a spot C10, the head thickness reduces gradually from the CF inner surface boundary point to the spot C10, and the head thickness at the spot C10 is 1.0 mm or less.

Claims14

Dependent claims

A golf club head with a hollow structure, comprising:

a face portion including a hitting face;
a crown portion;
and
a sole portion, wherein
the hitting face includes a face center,
a center vertical cross section that passes through the face center and extends in a face-back direction satisfies the following conditions (a) and (b):
(a) when a boundary point between an inner surface of the crown portion and an inner surface of the face portion is defined as a CF inner surface boundary point, a radius of curvature of a head inner surface at the CF inner surface boundary point is greater than or equal to 6.0 mm and less than or equal to 10.0 mm, and a head thickness at the CF inner surface boundary point is greater than or equal to 2.0 mm;
and
(b) when a spot that is located 10 mm apart from the CF inner surface boundary point toward a crown side is defined as a spot C10, the head thickness reduces gradually from the CF inner surface boundary point to the spot C10, and the head thickness at the spot C10 is less than or equal to 1.0 mm.

6 more elements

A golf club head with a hollow structure, comprising:

a face portion including a hitting face;
a crown portion;
and
a sole portion, wherein
the hitting face includes a face center,
a center vertical cross section that passes through the face center and extends in a face-back direction satisfies the following conditions (c) and (d):
(c) when a boundary point between an inner surface of the sole portion and an inner surface of the face portion is defined as an SF inner surface boundary point, a radius of curvature of a head inner surface at the SF inner surface boundary point is greater than or equal to 4.0 mm and less than or equal to 8.0 mm, and a head thickness at the SF inner surface boundary point is greater than or equal to 2.0 mm;
and
(d) when a spot that is located 15 mm apart from the SF inner surface boundary point toward a sole side is defined as a spot S15, the head thickness reduces gradually from the SF inner surface boundary point to the spot S15, and the head thickness at the spot S15 is less than or equal to 1.0 mm.

6 more elements

Dependencies are inferred from the claim text.