Golf ball

• US 5,813,924 A
• Filed: 06/18/1997
• Issued: 09/29/1998
• Est. Priority Date: 10/14/1994
• Status: Expired due to Term

• Current Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Original Assignee: Bridgestone Sports Co Limited (Bridgestone Corporation)
• Inventors: Yamagishi, Hisashi, Watanabe, Hideo, Egashira, Yoshinori, Kasasima, Atuki
• Primary Examiner(s): Marlo, George J.
• Application Number:
  US08/878,062
• Time in Patent Office: 468 Days
• Field of Search: 473/377, 473/383, 473/384, 473/378, 473/372, 473/373, 473/374, 473/351, 473/385, 273/DIG. 22
• US Class Current: 473/377
• CPC Class Codes: A63B 37/0004 Surface depressions or protrusions
• CPC Class Codes: A63B 37/0012 Dimple profile, i.e. cross-sectional view
• CPC Class Codes: A63B 37/0016 Specified individual dimple volume
• CPC Class Codes: A63B 37/0017 Specified total dimple volume
• CPC Class Codes: A63B 37/0018 Specified number of dimples
• CPC Class Codes: A63B 37/0019 Specified dimple depth
• CPC Class Codes: A63B 37/002 Specified dimple diameter
• CPC Class Codes: A63B 37/0031 Hardness
• CPC Class Codes: A63B 37/0033 Thickness
• CPC Class Codes: A63B 37/0062 Hardness
• CPC Class Codes: A63B 37/0064 Diameter
• CPC Class Codes: A63B 37/0074 Two piece balls, i.e. cover and core
• CPC Class Codes: A63B 37/0075 Three piece balls, i.e. cover, intermediate layer and core
• CPC Class Codes: A63B 37/0076 Multi-piece balls, i.e. having two or more intermediate layers
• CPC Class Codes: A63B 37/008 Diameter
• CPC Class Codes: A63B 37/0083 Weight; Mass
• CPC Class Codes: A63B 37/0096 Spin rate

Abstract

There is provided a golf ball comprising a core and a cover having a plurality of dimples thereon wherein said core has a distortion of 2.8 to 4.0 mm under a load of 100 kg, the ratio of a core distortion under a load of 100 kg divided by a ball distortion under a load of 100 kg ranges from 1.0 to 1.3, said cover has a thickness of 1.4 to 1.9 mm, and a Shore D hardness of 53 to 60, said dimples are divided into at least three kinds of dimples which have different diameters each other, each dimple has the ratio of diameter (mm) divided by depth (mm) of 18 to 27, the value of the spatial volume of each dimple below a plane defined by an edge of the dimple divided by the volume of a cylinder wherein the bottom of said cylinder is defined by said plane and the height is determined by the maximum depth of the dimple from said plane ranges from 0.390 to 0.550, and the total number of said dimples is in the range of 390 to 450.

Claims

1. A solid golf ball comprising a solid core and a cover having a plurality of dimples thereon wherein

the core has a distortion of 2.8 to 4.0 mm under a load of 100 kg,

the ratio of a core distortion (mm) under a load of 100 kg divided by a ball distortion (mm) under a load of 100 kg ranges from 1.0 to 1.3,

the cover has a thickness of 1.4 to 1.9 mm, and a Shore D hardness of 53 to 60,

said dimples are divided into at least three kinds of dimples which have different diameters each other,

each dimple has the ratio of diameter (mm) divided by depth (mm) of 18 to 27,

the value of the spatial volume of each dimple below a plane defined by an edge of the dimple divided by the volume of a cylinder wherein the bottom of said cylinder is defined by said plane and the height is determined by the maximum depth of the dimple from said plane ranges from 0.390 to 0.550, and

the total number of said dimples is in the range of 390 to 450.

2. The golf ball of claim 1 wherein the number of the dimples having the largest diameter occupies at least 10% in the total number of all the dimples, and each dimple having the largest diameter has the ratio of diameter (mm) divided by depth (mm) of 22 to 26.