Multi-piece solid golf ball

Details Multi-piece solid golf ball Multi-piece solid golf ball

1999-09-03

2001-04-10

Graham, Mark S. (Department: 3711)

Games using tangible projectile

Golf

Ball

C473S376000

Reexamination Certificate

active

06213896

ABSTRACT:

This invention relates to a multi-piece solid golf ball comprising at least three layers, a solid core, an intermediate layer, and a cover.
BACKGROUND OF THE INVENTION
Many two-piece solid golf balls are known in the art. As compared with wound golf balls, solid golf balls have the advantage of an increased total flight distance on both driver and iron shots, because of a so-called straight line trajectory and a low spin receptivity due to their structure, which allows for a long run. On the other hand, the two-piece solid golf balls are more difficult to control than the wound golf balls in that they do not stop short on the green because of low spin receptivity on iron shots.
Like flight distance, a soft feel when hit is essential for golf balls. The absence of a soft feel represents a substantial loss of commodity value of the golf ball. As compared with two-piece solid golf balls, wound golf balls have the structural characteristics ensuring a soft and pleasant feel.
On two-piece solid golf balls consisting of a core and a cover, attempts have been made to soften the ball structure in order to accomplish a soft feel upon impact. A soft core is often used to obtain such soft-feel two-piece solid golf balls, but making the core softer lowers the resilience of the golf ball, compromises flight performance, and also markedly reduces durability. As a result, not only do these balls lack the excellent flight performance and durability characteristic of ordinary two-piece solid golf balls, but they are often in fact unfit for actual use.
Various three-piece solid golf balls having a three-layer construction in which an intermediate layer is situated between a solid core and a cover have been proposed to resolve these problems as disclosed, for example, in JP-A 7-24084, 6-23069, 4-244174, 9-10358, and 9-313643.
Golf balls having the cover and the intermediate layer made soft according to these proposals have a soft feel, but a shorter flight distance on full shots with a driver. To insure distance, the cover and the intermediate layer must be formed hard at the sacrifice of the feel upon approach shots and putting. Additionally, the spin performance on iron shots is also exacerbated. None of the prior art proposals succeeded in providing a solid golf ball capable of fully meeting the demand. A further improvement is thus desired.
SUMMARY OF THE INVENTION
Therefore, an object of the invention is to provide a multi-piece solid golf ball comprising at least three layers, a solid core, an intermediate layer, and a cover, which has a very soft pleasant feel upon approach shots and putting, ease of control upon iron shots, and improved flight performance upon full shots with a driver.
The invention provides a multi-piece solid golf ball comprising a solid core, an intermediate layer of at least one layer around the core, and a cover of at least one layer around the intermediate layer. (1) When the solid core has a deflection A (mm) under an applied load of 100 kg and a spherical body consisting of the core and the intermediate layer has a deflection B (mm) under an applied load of 100 kg, the value of B/A is from 1.0 to 1.5. (2) The solid core is preferably formed mainly of a rubber base and has a specific gravity of 1.1 to 1.5 and a deflection A of at least 2.5 mm under an applied load of 100 kg. (3) The intermediate layer preferably has a thickness of 0.2 to 5.0 mm and a specific gravity of at least 0.8. (4) The cover is preferably formed of a cover stock composed mainly of a thermoplastic resin and has a thickness of 1.0 to 5.0 mm and a specific gravity of at least 0.9. (5) The specific gravity of the intermediate layer is desirably lower than the specific gravity of the solid core. When all these features are fulfilled, the ball is given a very soft pleasant feel upon approach shots and putting and a high spin receptivity and hence, ease of control upon iron shots, without detracting from the flight distance characteristic of ordinary solid golf balls. Additionally, the ball is improved in durability against consecutive strikes.


REFERENCES:
patent: 5553852 (1996-09-01), Higuchi et al.
patent: 5556098 (1996-09-01), Higuchi et al.
patent: 5730664 (1998-03-01), Asakura et al.
patent: 5957784 (1999-09-01), Asakura et al.
patent: 5976034 (1999-11-01), Kato et al.

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