Multi-piece solid golf ball

Patent metadata

Field	Value
Publication number	US-9636547-B2
Application number	US-201514873370-A
Country	US
Kind code	B2
Filing date	Oct 2, 2015
Priority date	Dec 17, 2014
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

In a multi-piece solid golf ball having a core, a cover and an intermediate layer therebetween, the core, an intermediate layer-encased sphere and the ball have surface hardnesses which satisfy a specific relationship, and the intermediate layer and the cover have thicknesses which satisfy a specific relationship. Also, the core has a hardness profile in which the hardnesses at the core surface, core center, a position 5 mm from the core center, and a position midway between the surface and center of the core satisfy specific relationships. This golf ball, when used by mid- and high-level amateurs, enables the golfer to maintain an adequate distance on shots with a driver and achieve a good distance on iron shots, has a good spin performance on approach shots and has a good feel on impact. In addition, the ball has an excellent scuff resistance when struck with a grooved wedge.

First claim

The invention claimed is:

1. A multi-piece solid golf ball comprising a core, a cover and an intermediate layer therebetween,
wherein the core, a sphere composed of the core and the intermediate layer which peripherally encases the core (intermediate layer-encased sphere), and the ball have respective surface hardnesses, expressed in terms of Shore D hardness, which satisfy the relationship
ball surface hardness≦surface hardness of intermediate layer-encased sphere≧core surface hardness;

the intermediate layer and the cover have respective thicknesses which satisfy the relationship
(thickness of intermediate layer−thickness of cover)≧0; and

the core has a hardness profile which, expressed in terms of JIS-C hardness, satisfies the following relationships:
22≦core surface hardness ( Cs )−core center hardness ( Cc ),

5≧[hardness at a position 5 mm from core center ( C 5)−core center hardness ( Cc )]>0, and

[core surface hardness ( Cs )−core center hardness ( Cc )]/[hardness at a position midway between core surface and core center ( Cm )−core center hardness ( Cc )]≧4.

2. The multi-piece solid golf ball of claim 1 , wherein the [hardness at a position midway between core surface and core center (Cm)−core center hardness (Cc)] value, expressed in terms of JIS-C hardness, is 6 or less.

3. The multi-piece solid golf ball of claim 1 , wherein the [core surface hardness (Cs)−core center hardness (Cc)]/[hardness at a position 5 mm from core center (C5)−core center hardness (Cc)] value, is 4 or more.

4. The multi-piece solid golf ball of claim 1 , wherein the (initial velocity of intermediate layer-encased sphere−initial velocity of core) value is −0.10 m/s or above.

5. The multi-piece solid golf ball of claim 1 , wherein the (core surface hardness−ball surface hardness) value, expressed in terms of Shore D hardness, is in the range of −10 to 2.

6. The multi-piece solid golf ball of claim 1 which satisfies the relationship 0.7 mm ≦E-B ≦1.6 mm, wherein E is the deflection of the core when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) and B is the deflection of the ball when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf).

7. The multi-piece solid golf ball of claim 1 , wherein the initial velocities of the core, the intermediate layer-encased sphere and the ball satisfy the relationships:
−0.1 m/s≦ball initial velocity−core initial velocity≦1 m/s; and

−1.3 m/s≦ball initial velocity−initial velocity of intermediate layer-encased sphere−0.1 m/s.

Assignees

• Bridgestone Sports Co Ltd

Inventors

• Watanabe Hideo
• Kimura Akira

Classifications

• A63B37/0062

  Hardness · CPC title

• A63B37/0075 Primary

  Three piece balls, i.e. cover, intermediate layer and core · CPC title

• A63B37/0081

  Human Necessities · mapped topic

• A63B37/0068

  Initial velocity · CPC title

• A63B37/0084

  Initial velocity · CPC title