Games using tangible projectile – Golf – Club or club support
Reexamination Certificate
2000-02-28
2001-05-29
Passaniti, Sebastiano (Department: 3711)
Games using tangible projectile
Golf
Club or club support
C473S345000, C473S349000, C473S350000
Reexamination Certificate
active
06238301
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a golf club, specifically to a material of a head thereof.
(b) Description of Prior Art
In recent years, titanium or titanium alloy has come to be used for a material for a golf head, due to its light and comparatively strong property. Titanium or titanium alloy has been used as a material not only for an iron head or a putter head, but for a hollow metallic head of a wood club (so called metal wood). The light weight of titanium or titanium alloy enables the lightening of a head as well as the large-sizing thereof. A light head is easy to play with, while a large head has a larger sweet area, i.e., an area on a striking face in which a ball travels well and comparatively straight when struck thereon.
Conventional titanium alloy used for a material of a head, for example, is titanium-aluminum (Ti—Al) alloy, as described in Japanese Patent Un-Examined Publication No. 6-545. However, as titanium or titanium alloys have such a high melting point that they have been difficult to cast. For example, the melting point of titanium is about 1,700 degrees centigrade, while that of a Ti—Al alloy also is as high as between 1,500 and 1,600 degrees centigrade. Further, titanium, though it has a high stiffness, is comparatively fragile material, so that it has been liable to be damaged by the shocks developed in striking balls. Furthermore, it has been desired that a golf club head should have an improved strength and be further lightened, in order to be suited for various manners in which it is used.
SUMMARY OF THE INVENTION
Accordingly, it is a main object of the present invention to provide a golf club having an improved durability, realizing a further lightening thereof, using titanium alloy.
It is another object of the invention to provide a golf club which is easy to cast, using titanium alloy.
It is a further object of the invention to provide a golf club whose stiffness, strength and durability is further improved.
To attain the above objects, a golf club of the invention uses Ti—Be alloy for a material of a head, said Ti—Be alloy having a melting point of 1,000 degrees centigrade or below, or at least starting melting at 1,000 degrees centigrade or below. The Ti—Be alloy of such low melting point can be obtained by mixing preferably 20 mol % Be and Ti, and then fusing them. It is desirable to subject the fused mixture to a certain heat treatment and an aging treatment, thereby allowing solid solutions such as TiBe and/or TiBe
2
to be precipitated.
REFERENCES:
patent: 3989517 (1976-11-01), Tanner
patent: 5255918 (1993-10-01), Anderson
patent: 5378295 (1995-01-01), Yamashita
patent: 5465968 (1995-11-01), Aizawa
patent: 5567251 (1996-10-01), Peker
patent: 401259876A (1989-10-01), None
patent: 407024092A (1995-01-01), None
patent: 409103522A (1997-04-01), None
patent: 408243196A (1997-04-01), None
Kabushiki Kaisha Endo Seisakusho
Passaniti Sebastiano
Quarles & Brady LLP
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