Two-piece solid golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsHisashi Yamagishi, Jun Shindo
Life of this patent
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Abstract
In a two-piece solid golf ball comprising a solid core and a cover having a number of dimples, the solid core has such a distribution of hardness on a JIS-C hardness scale that a surface hardness is 70-85 degrees and a center hardness is lower than the surface hardness by 8-20 degrees, and the hardness within 5 mm inside the core surface is up to 8 degrees lower than the surface hardness. The cover has a hardness of 75-90 degrees on a JIS-C hardness scale which is higher than the surface hardness of the core by 1-15 degrees and a gage of 1.5-1.95 mm. The number of dimples is 360-450. Since the hardness distribution of the core and cover, the gage of the cover, and the number of dimples are optimized, the ball is improved in flight distance, controllability and hitting feel.
Claims4
A two-piece solid golf ball comprising a solid core and a cover enclosing the core and having a number of dimples in its surface, wherein
- said solid core has such a distribution of hardness as measured by a JIS-C scale hardness meter that a surface hardness is up to 85 degrees, a center hardness is lower than the surface hardness by not less than 8 to less than 20 degrees, and a hardness within 5 mm inside the core surface is up to 8 degrees lower than the surface hardness,
- said cover has a hardness which is higher than the surface hardness of the core by 1 to 15 degrees and a gage of 1.5 to 1.95 mm, and
- the number of dimples is 360 to 450.
Dependencies are inferred from the claim text.