Hollow golf ball

Details Hollow golf ball Hollow golf ball

1998-10-26

2001-02-06

Chapman, Jeanette (Department: 3711)

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

C273S351000

Reexamination Certificate

active

06182970

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a hollow golf ball. More particularly, the present invention relates to a hollow golf ball having good shot feel at the time of hitting, while maintaining excellent flight performance.
BACKGROUND OF THE INVENTION
Hitherto, there have been mainly produced two types of golf balls. The one is a solid golf ball, such as a two-piece golf ball or three-piece golf ball, and the other is a thread wound golf ball. The solid golf ball, when compared with the thread wound golf ball, has better durability and better flight performance because of a larger initial velocity at the time of hitting and longer flight distance. Therefore, the solid golf ball is generally approved or utilized by many golfers, particularly amateur golfers. With regard to enhancement of flight distance, the development of the golf ball has mainly focused on solid golf balls rather than thread wound golf balls.
On the other hand, the solid golf ball exhibits hard and poor shot feel at the time of hitting. It has been known that the flight distance is largely affected by the rebound characteristics of the solid golf ball. Recently, in order to improve the shot feel of the solid golf ball, it has been attempted to soften the core of the solid golf ball to reduce the hardness of the golf ball. However, there is the drawback that the rebound characteristics of the golf ball are degraded and the flight performance is reduced, because of the softening of the core.
These performances are generally governed by two factors, that is the surface hardness of the core and the deformation amount of the core. When the surface hardness is larger, the deformation amount is reduced and the rebound characteristics are enhanced, but the shot feel is poor. On the other hand, when the surface hardness is smaller, the deformation amount is decreased and the shot feel is enhanced, but the rebound characteristics are degraded. Therefore, it is very difficult to improve both flight distance and shot feel of the conventional, solid golf ball having a solid core.
SUMMARY OF THE INVENTION
A main object of the present invention is to provide a hollow golf ball having good shot feel at the time of hitting, while maintaining excellent flight performance.
According to the present invention, the object described above has been accomplished by providing a golf ball with a hollow core composed of a hollow portion and a hollow core outer layer and by adjusting the diameter of the hollow portion of the golf ball, the surface hardness of the hollow core in JIS-C hardness and the deformation amount when applying from an initial load of 10 kgf to a final load of 130 kgf on the core to a specific range. Thus a hollow golf ball is provided having good shot feel at the time of hitting, while maintaining excellent flight performance.
The above object as well as other objects and advantages of the present invention will become apparent to those skilled in the art from the following description with reference to the accompanying drawings, wherein


REFERENCES:
patent: 5150906 (1992-09-01), Molitor et al.
patent: 5480155 (1996-01-01), Molitor et al.

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