Golf ball

• US 4,720,111 A
• Filed: 07/10/1984
• Issued: 01/19/1988
• Est. Priority Date: 11/21/1983
• Status: Expired due to Term

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Yamada, Kaname
• Primary Examiner(s): Marlo, George J.
• Application Number:
  US06/629,386
• Time in Patent Office: 1,288 Days
• Field of Search: 273/232, 273/233, 273/234, 273/235 R, 273/235 A, 273/235 B, 40/327
• US Class Current: 473/382
• 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 37/0018 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 37/0026 Balata
• 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 37/0089 Coefficient of drag
• CPC Class Codes: A63B 37/009 Coefficient of lift
• CPC Class Codes: A63B 37/0096 Spin rate

Abstract

A golf ball which can achieve an extra distance at the low-speed range of its trajectory from the peak point to the ground to give an increased overall flight distance, said golf ball having a plurality of dimples formed in an exactly or substantially identical arrangement pattern in each of eight equal portions of a spherical surface divided by phantom lines, said arrangement pattern being provided on the spherical surface of the golf ball for forming 416 or 504 dimples without adjacent dimples overlapping each other, said golf ball being in the range of 500 to 1000 in a value defined by the equal ##EQU1## wherein D: the diameter (mm) of dimples,

N: the total number of dimples,

R: the diameter (mm) of golf ball,

Ek: The diameter (mm) of dimple at a a point k microns away from the dimple edge downward, i.e. in the direction of depth of dimple (apparent diameter of dimple when the dimpled land portion is cut in parallel with the plane containing the dimple edge at its opening), and

n: the depth of dimple (in microns)

For a ball having 416 dimples, the preferred dimple diameter is 3.2-3.6 mm and a depth of dimple such that the total dimple volume is 222-476 mm³.

Claims

1. A golf ball having a spherical surface containing therein eight triangular areas divided by phantom lines and extended over the spherical surface, each of the triangular areas comprising three sides of equal spherical length,

the golf ball being provided on the spherical surface to form 52 dimples in each of the triangular areas without adjacent dimples overlapping each other and to form totally 416 dimples,

said 52 dimples being so arranged that a first spherically shaped triangle formed inside and along the triangular area defined by the phantom lines comprises three sides of equal spherical length and includes 9 dimples formed on each of the side lines to provide totally 24 dimples, a second spherically shaped triangle formed inside and along the first triangle comprises three sides of equal spherical length and includes 7 dimples formed on each of the side lines to provide totally 18 dimples, and a third spherically shaped triangle formed inside and along the second triangle includes 4 dimples formed on each of the side lines to provide totally 9 dimples and further includes 1 dimple inside thereof,

said golf ball having a diameter of the dimples being 3.2 to 3.6 l mm and of a dimple depth such that the total volume of the dimples is in the range of 222 to 476 mm³.

2. The golf ball as defined in claim 1 wherein the ball having 41.2 mm diameter is in the range of 238 to 476 mm³ in the total volume of the dimples.

3. The golf ball as defined in claim 1 wherein the ball having 42.7 mm diameter is in the range of 238 to 476 mm³ in the total volume of the dimples.