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US 6,855,072 B2Granted
Multi-piece solid golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsHisashi Yamagishi, Hiroshi Higuchi, Junji Hayashi, Akira Kawata
Life of this patent
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Abstract
A multi-piece solid golf ball comprising a solid core and a cover of two inner and outer layers surrounding the core. The outer cover layer has a surface formed with a plurality of three types of dimples such that a product of the Shore D hardness of the inner cover layer multiplied by the Shore D hardness of the outer cover layer and a proportion VR (%) of the total of the volumes of dimple spaces satisfy one of: (1) 1,500 to less than 2,000 VR: 0.8 to 1.1% (2) 2,000 to less than 2,500 VR: 0.75 to 1.05% (3) 2,500 to less than 3,000 VR: 0.7 to 1% (4) 3,000 to less than 3,500 VR: 0.65 to 0.95% (5) 3,500 to 4,000 VR: 0.6 to 0.9%.
Claims9
A multi-piece solid golf ball comprising;
- a solid core and a cover consisting of inner and outer layers surrounding the core, the outer cover layer having a surface formed with a plurality of dimples,
- said solid core having a distortion of 2.8 to 6.0 mm under load of 100 kg, and
- a product of the Shore D hardness of said inner cover layer multiplied by the Shore D hardness of said outer cover layer and a proportion VR (%) of the total of the volumes of dimple spaces each defined below a plane circumscribed by the dimple edge to the overall volume of a phantom sphere given on the assumption that the golf ball surface is free of dimples satisfying any one of the following combinations (1) to (5):
- (1) the product of Shore D hardnesses of inner and outer cover layers:
- 1,500 to less than 2,000
- VR:
- 0.82 to 1.08%
- (2) the product of Shore D hardnesses of inner and outer cover layers:
- 2,000 to less than 2,500
- VR:
- 0.77 to 1.03%
- (3) the product of Shore D hardnesses of inner and outer cover layers:
- 2,500 to less than 3,000
- VR:
- 0.72 to 0.98%
- (4) the product of Shore D hardnesses of inner and outer cover layers:
- 3,000 to less than 3,500
- VR:
- 0.67 to 0.93%
- (5) the product of Shore D hardnesses of inner and outer cover layers:
- 3,500 to 4,000
- VR:
- 0.62 to 0.88%,
- and the total number of said dimples being 370 to 450, and said dimples including at least three types of dimples which are different in at least one of a diameter, a depth, and a value VO which is the volume of one dimple space defined below a plane circumscribed by the dimple edge divided by the volume of a cylinder whose bottom is the plane and whose height is the maximum depth of the dimple from the bottom, wherein the dimples of the largest type have the diameter of 3.7 to 4.5 mm, the depth of 0.15 to 0.25 mm and the V0 value of 0.38 to 0.55, and their number is 5 to 80% of the total dimple number.
21 more elements
A multi-piece solid golf ball comprising;
- a solid core and a cover consisting of inner and outer layers surrounding the core, the outer cover layer having a surface formed with a plurality of dimples,
- said solid core having a distortion of 2.8 to 6.0 mm under load of 100 kg, and
- a product of the Shore D hardness of said inner cover layer multiplied by the Shore D hardness of said outer cover layer and a proportion VR (%) of the total of the volumes of dimple spaces each defined below a plane circumscribed by the dimple edge to the overall volume of a phantom sphere given on the assumption that the golf ball surface is free of dimples satisfying any one of the following combinations (1) to (5):
- (1) the product of Shore D hardnesses of inner and outer cover layers:
- 1,500 to less than 2,000
- VR:
- 0.82 to 1.08%
- (2) the product of Shore D hardnesses of inner and outer cover layers:
- 2,000 to less than 2,500
- VR:
- 0.77 to 1.03%
- (3) the product of Shore D hardnesses of inner and outer cover layers:
- 2,500 to less than 3,000
- VR:
- 0.72 to 0.98%
- (4) the product of Shore D hardnesses of inner and outer cover layers:
- 3,000 to less than 3,500
- VR:
- 0.67 to 0.93%
- (5) the product of Shore D hardnesses of inner and outer cover layers:
- 3,500 to 4,000
- VR:
- 0.62 to 0.88%,
- and the total number of said dimples being 370 to 450, and said dimples including at least three types of dimples which are different in at least one of a diameter, a depth, and a value V0 which is the volume of one dimple space defined below a plane circumscribed by the dimple edge divided by the volume of a cylinder whose bottom is the plane and whose height is the maximum depth of the dimple from the bottom, wherein the dimples of the smallest type have the diameter of 2.0 to 3.7 mm, the depth of 0.08 to 0.23 mm and the V0 value of 0.38 to 0.55, and their number is 1 to 40% of the total dimple number.
21 more elements
Dependencies are inferred from the claim text.