Golf ball

• US 4,848,766 A
• Filed: 03/07/1986
• Issued: 07/18/1989
• Est. Priority Date: 09/30/1985
• Status: Expired due to Term

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Yamada, Kaname, Oka, Kengo
• Primary Examiner(s): MARLO, GEORGE J
• Application Number:
  US06/837,258
• Time in Patent Office: 1,229 Days
• Field of Search: 273/232
• US Class Current: 473/384
• CPC Class Codes: A63B 37/0004 Surface depressions or protrusions
• CPC Class Codes: A63B 37/0006 Arrangement or layout of dimples
• 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 37/0026 Balata
• CPC Class Codes: A63B 37/0031 Hardness
• CPC Class Codes: A63B 37/0052 Liquid cores
• CPC Class Codes: A63B 37/0053 Thread wound
• CPC Class Codes: A63B 37/0062 Hardness
• CPC Class Codes: A63B 37/0064 Diameter
• CPC Class Codes: A63B 37/0068 Initial velocity
• CPC Class Codes: A63B 37/0074 Two piece balls, i.e. cover and core
• CPC Class Codes: A63B 37/0084 Initial velocity
• CPC Class Codes: A63B 37/0096 Spin rate

Abstract

An improved golf ball which includes a golf ball main body, and large dimples having a large diameter A and small dimples having a small diameter B which are formed in a large number on the peripheral surface of the golf ball main body. The large and small dimples are provided in the ratio of the diameters A/B within the range of 1.25 to 1.50.

Claims

1. A golf ball containing improved aerodynamic characteristics and enhanced flying performance which comprises a golf ball main, dimples having a large diameter A and dimples having a small diameter B, being disposed in numbers of 336, 380, or 416 or slight variances therefrom, on the peripheral surface of said golf ball main body, said large and small dimples having a diameter ratio A/B within the range of 1.25 to 1.50, said large diameter dimples and said small diameter dimples being provided in approximately the same number on the surface of said golf ball main body, said large and small diameter dimples being arranged uniformly on the peripheral surface of said golf ball main body in such a manner that all of said large diameter dimples are located adjacent to at least one of said small diameter dimples, and all of said small diameter dimples are located adjacent to at least one of said large diameter dimples, and wherein an average interval C between the dimples adjacent to each other is within the range of 0 to 0.5 mm.

2. A golf ball as claimed in claim 1, having a total dimples volume represented by a formula, ##EQU2## where V_T =total dimples volume,

V_A =total large dimples volume,

V_B =total small dimples volume,

N_A =total number of the large dimples,

N_B =total number of the small dimples,

A_k =diameter of the large dimple at a point descended in a direction of depth of k microns from the dimple edge (mm),

B_k =diameter of the small dimple at a point descended in a direction of depth of k microns from the dimple edge (mm),

n=depth of dimple (microns), said total dimples volume being set in the range of 250 to 400 mm³.

3. The golf ball as claimed in claim 2, wherein the total number of the dimples is 336, with the number of each of the large dimples and the small dimples being about 168, the large diameter A of the large dimples being in the range of 4.3 to 4.9 mm, with the small diameter B of the small dimples being in the range of 3.0 to 3.6 mm.

4. The golf ball as claimed in claim 2, wherein the total number of the dimples is 380, with the number of each of the large dimples and the small dimples being about 190, the large diameter A of the large dimples being in the range of 3.8 to 4.4 mm, with the small diameter B of the small dimples being in the range of 2.6 to 3.2 mm.

5. The golf ball as claimed in claim 2, wherein the total number of the dimples is 416, with the number of each of the large dimples and the small dimples being about 208 pieces, the large diameter A of the large dimples being in the range of 3.7 to 4.3 mm, with the small diameter B of the small dimples being in the range of 2.5 to 3.1 mm.