Golf ball

• US 6,066,055 A
• Filed: 06/22/1999
• Issued: 05/23/2000
• Est. Priority Date: 07/22/1998
• Status: Expired due to Term

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Nishino, Takumi
• Primary Examiner(s): Young, Lee
• Assistant Examiner(s): KIM, PAUL D
• Application Number:
  US09/337,732
• Time in Patent Office: 336 Days
• Field of Search: 473/378-384
• US Class Current: 473/384
• CPC Class Codes: A63B 37/0004 Surface depressions or protrusions
• CPC Class Codes: A63B 37/00065 located around the pole or the equator
• CPC Class Codes: A63B 37/0012 Dimple profile, i.e. cross-sectional view
• CPC Class Codes: A63B 37/0015 with sub-dimples formed within main dimples
• CPC Class Codes: A63B 37/0017 Specified total dimple volume
• CPC Class Codes: A63B 37/0019 Specified dimple depth
• CPC Class Codes: A63B 37/002 Specified dimple diameter

Abstract

A golf ball formed with half metal molds having stable flying ability without dispersion, regardless of hitting point on surface of the ball.

A parting line is latitude 0°, two pole portions are latitude 90°, an area of which latitude is 0° to 17° is a parting line vicinity, an area of which latitude is more than 17° and less than 62° is a shoulder portion, an area of which latitude is 62° to 90 ° is a pole vicinity. And, when X represents total volume of dimples which belong to the parting line vicinity, Y represents total volume of dimples which belong to the pole vicinity, and Z represents total volume of dimples which belong to the shoulder portion, X/Z is set to be 0.58 to 0.72, Y/Z is set to be 0.22 to 0.30, and Y/X is set to be 0.35 to 0.48.

Claims

1. A golf ball formed by half metal molds comprising an arrangement in which:

a parting line is latitude 0° and

both poles are latitude 90°

;

a range of which latitude is 0°

to 17°

is a parting line vicinity, a range of which latitude is more than 17° and

less than 62°

is a shoulder portion, and a range of which latitude is 62°

to 90 °

is a pole vicinity; and

when X represents total volume of dimples which belong to the parting line vicinity, Y represents total volume of dimples which belong to the pole vicinity, and Z represents total volume of dimples which belong to the shoulder portion, a ratio of is set to be 0.58 to 0.72, and a ratio of is set to be 0.22 to 0.30.

2. The golf ball as set forth in claim 1, wherein a ratio of Y/X is set to be 0.35 to 0.48.

3. A golf ball formed by half metal molds comprising an arrangement in which:

a parting line is latitude 0° and

both poles are latitude 90°

;

a range of which latitude is 0°

to 17°

is a parting line vicinity, a range of which latitude is more than 17° and

less than 62°

is a shoulder portion, and a range of which latitude is 62°

to 90 °

is a pole vicinity;

plural kinds of dimples having different diameter are disposed on the shoulder portion, and at least one kind of dimples among the plural kinds of dimples disposed on the shoulder portion are disposed on the parting line vicinity and the pole vicinity; and

depths of the dimples which belong to the parting line vicinity and the pole vicinity are respectively arranged to be deeper than that of the dimples of same diameter which belong to the shoulder portion by 0.003 mm to 0.06 mm.

4. A golf ball formed by half metal molds comprising an arrangement in which:

a parting line is latitude 0° and

both poles are latitude 90°

;

a range of which latitude is 0°

to 17°

is a parting line vicinity, a range of which latitude is more than 17° and

less than 62°

is a shoulder portion, and a range of which latitude is 62°

to 90 °

is a pole vicinity; and

dimples having same diameter are disposed on the whole surface of the golf ball, and depths of the dimples which belong to the parting line vicinity and the pole vicinity are respectively arranged to be deeper than that of the dimples which belong to the shoulder portion by 0.003 mm to 0.06 mm.