Games using tangible projectile – Golf – Club or club support
Reexamination Certificate
1999-11-17
2001-02-06
Passaniti, Sebastiano (Department: 3711)
Games using tangible projectile
Golf
Club or club support
C473S349000
Reexamination Certificate
active
06183378
ABSTRACT:
BACKGROUND OF THE INVENTION
Ceramics and cermets have been attractive materials for golf clubs because of their hardness, wear resistance and light weight. However, the limited ductility and resistance to fracture of ceramics and cermets as well as limited joining methods for attachment to other components of golf club heads have severely limited their use.
Ceramic inserts have been attached to the face of golf clubs by the use of various non-metallic adhesives. Entire golf club heads have been fabricated from ceramics and cermets. However, these have not proved satisfactory because of early failures of the ceramic and cermet components. The dominant modes of failure have been cracking and spalling.
BRIEF SUMMARY OF THE INVENTION
Applicant has found that ceramics and cermets may be successfully joined to metals to produce composite golf club heads by the use of brazing alloys. If the metal being used is not a reactive metal such as titanium or zirconium, it is necessary to have a reactive material in the brazing alloy so the proper wetting of the created alloy on the ceramics and oxides will occur. Where the metal used is titanium or zirconium, the brazing alloy will absorb enough titanium or zirconium to create extremely free flowing and wetting behavior. By thus joining the ceramic or cermet components to metal portions of the golf club head, compressive stresses are created rather than tensile stresses which virtually eliminates failure of the ceramic and cermet from cracking and spalling. The compressive loading created by the base metal and braze alloy shrinkage upon cooling creates a condition most favorable for impact loading for a golf club face.
It is therefore an object of this invention to provide a method of joining ceramic or cermet components to metal golf club heads wherein the ceramic and cermet components are resistant to failure by cracking or other stress induced causes.
It is also an object of this invention to produce a golf club head comprising a compressively loaded ceramic component.
This, together with other objects of the invention, will become apparent from the following detailed description of the invention and the accompanying drawings.
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Carbite, Inc.
John L. Gray, Esq.
Kegler, Brown Hill & Ritter, L.P.A.
Passaniti Sebastiano
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