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US 10,293,217 B2Granted
Multi-piece solid golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsKatsunori Sato, Hideo Watanabe
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AssigneeBridgestone Sports Co., Ltd.
InventorsKatsunori Sato, Hideo Watanabe
Estimating the term…
A multi-piece solid golf ball having a two-layer core with an inner core layer and an outer core layer and having a cover of one or more layer with numerous dimples on the surface is characterized in that the hardest cover layer has a specific material hardness and the ball has a specific value obtained by subtracting the surface hardness of the overall core from the surface hardness of the hardest cover layer, a specific deflection, and a specific value obtained by subtracting the initial velocity of the inner core layer from the initial velocity of the sphere consisting of the inner core layer encased by the outer core layer. This golf ball enables relatively low head speed golfers to achieve a good distance on full shots with drivers and iron clubs and also provides a soft, comfortable feel at impact.
A multi-piece solid golf ball comprising a two-layer core consisting of an inner core layer and an outer core layer, and a cover of one or more layer having a surface with numerous dimples formed thereon, wherein the cover layer with the greatest hardness of all the cover layers has a material hardness on the Shore D hardness scale of at least 56, the Shore D hardness value obtained by subtracting the surface hardness of the overall core from the surface hardness of the hardest cover layer is at least 2, the ball has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of at least 2.7 mm, and the value obtained by subtracting the initial velocity of the inner core layer from the initial velocity of the sphere consisting of the inner core layer encased by the outer core layer is at least 1 m/s, and
A multi-piece solid golf ball comprising a two-layer core consisting of an inner core layer and an outer core layer, and a cover of one or more layer having a surface with numerous dimples formed thereon, wherein the cover layer with the greatest hardness of all the cover layers has a material hardness on the Shore D hardness scale of at least 56, the Shore D hardness value obtained by subtracting the surface hardness of the overall core from the surface hardness of the hardest cover layer is at least 2, the ball has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of at least 2.7 mm, and the value obtained by subtracting the initial velocity of the inner core layer from the initial velocity of the sphere consisting of the inner core layer encased by the outer core layer is at least 1 m/s, and wherein the overall core has a hardness profile which, letting Cc be the JIS-C hardness at a center of the core, Cc+5 be the JIS-C hardness at a position 5 mm from the core center, Cs−5 be the JIS-C hardness at a position 5 mm inside the core surface, and Cs be the JIS-C hardness at the core surface, satisfies conditions (1) to (3) below:
A multi-piece solid golf ball comprising a two-layer core consisting of an inner core layer and an outer core layer, and a cover of one or more layer having a surface with numerous dimples formed thereon, wherein the cover layer with the greatest hardness of all the cover layers has a material hardness on the Shore D hardness scale of at least 56, the Shore D hardness value obtained by subtracting the surface hardness of the overall core from the surface hardness of the hardest cover layer is at least 2, the ball has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) of at least 2.7 mm, and the value obtained by subtracting the initial velocity of the inner core layer from the initial velocity of the sphere consisting of the inner core layer encased by the outer core layer is at least 1 m/s, and wherein the dimples are of non-spherical shape and the ball surface has a land thereon which is surrounded by a plurality of the non-spherical dimples, the land having a shape that includes at least one vertex, being contiguous at substantially a point with each of at least two neighboring lands and having a surface area in the range of from 0.05 to 16.00 mm2.
Dependencies are inferred from the claim text.