Golf ball

• US 4,681,323 A
• Filed: 02/07/1985
• Issued: 07/21/1987
• Est. Priority Date: 02/07/1984
• Status: Expired due to Term

• Current Assignee: Bridgestone Corporation
• Original Assignee: Bridgestone Corporation
• Inventors: Ohtake, Masayuki, Ihara, Keisuke, Alaki, Yasuhide
• Primary Examiner(s): Marlo, George J.
• Application Number:
  US06/699,438
• Time in Patent Office: 894 Days
• Field of Search: 273/232, 273/220, 273/218, 273/227
• US Class Current: 473/384
• 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 37/0021 Occupation ratio, i.e. percentage surface occupied by dimples
• CPC Class Codes: A63B 37/0033 Thickness
• CPC Class Codes: A63B 37/0074 Two piece balls, i.e. cover and core
• CPC Class Codes: A63B 37/008 Diameter
• CPC Class Codes: A63B 37/0083 Weight; Mass
• CPC Class Codes: A63B 37/0087 Deflection or compression
• CPC Class Codes: Y10S 273/22 Ionomer

Abstract

A golf ball with a plurality of recessed dimples having a shape in accordance with a certain mathematical ratio on the surface thereof is disclosed. 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 the cylinder is defined by the plane and the height is determined by the maximum depth of the dimple from the plane, is within the range of 0.35 to 0.43. The dimples having such a shape represent at least 90 percent of the total number of dimples on the golf ball. The maximum diameter of the dimple can be within the range of 2 to 4 mm and the maximum depth of the dimple can be within the range of 0.1 to 0.4 mm. This configuration results in a golf ball having an increased carry.

Claims

1. A golf ball having a plurality of recessed dimples on the surface thereof, wherein said dimples have a shape wherein 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, is within the range from 0.35 to 0.43, wherein the maximum diameter of the dimple is within the range of 2-4 mm and the maximum depth of the dimple is within the range of 0.1-0.4 mm, said dimples representing at least 90 percent of the total number of dimples on said golf ball.

2. A golf ball according to claim 1 wherein the value of the spatial volume of the dimple divided by the volume of the cylinder, is within the range from 0.37 to 0.41.

3. A golf ball according to claim 1 wherein the shape of the dimple in plan is a circle.

4. A golf ball according to claim 1 wherein the total number of the dimples is within the range from 280 to 330.

5. A golf ball according to claim 1 wherein the golf ball is a two piece solid ball.

6. A golf ball having a plurality of recessed dimples which in plan view have a circular shape, wherein the value of V₀ of said dimples ranges from 0.35 to 0.43, wherein V₀ is determined by the method comprising the steps of:

drawing an imaginary spherical face 2 of the diameter of the ball above a dimple 1 as illustrated in FIGS. 5 and 6;

drawing another spherical face 3 having a smaller diameter by 0.16 mm then the ball diameter;

determining cross points 4 between the spherical face 3 and the dimple 1;

drawing a line of cross points 6 between tangential lines 5 at the cross points 4 and the imaginary spherical face 2 to define a define a dimple edge 7;

calculating a first volume V₁ of a dimple space 9 below a plane 8 defined by the dimple edge 7 by the following equation;

##STR1## calculating a volume V₂ of a cylinder 10 wherein the bottom thereof is defined by the plane 8 and the height is defined by the maximum dimple depth Dp from the plane 8 by the following equation;

##EQU3## and calculating V₀ by the following equation;

space="preserve" listing-type="equation">V.sub.0 =V.sub.1 /V.sub.2,

said dimples representing at least 90% of the total number of dimples on said golf ball.

7. The golf ball according to claim 6, wherein V₀ ranges from 0.37 to 0.41.

8. The golf ball according to claim 6, wherein the maximum diameter of the dimple ranges from 2 to 4 mm and the maximum depth of the dimple ranges from 0.1 to 0.4 mm.

9. The golf ball according to claim 6, wherein the total number of dimples ranges from 280 to 300.

10. The golf ball according to claim 6, wherein the golf ball is a two piece solid ball.