HOLLOW GOLF CLUB HEAD AND METHOD OF MANUFACTURING THE SAME
First Claim
1. A hollow golf club head including a metal plate portion provided with a thin portion and a thick portion, whereina medium thick portion having an intermediate thickness between a thickness of the thin portion and a thickness of the thick portion is formed at a boundary portion between the thin portion and the thick portion, andthe thin portion and the medium thick portion are formed by the steps ofpressing the metal plate portion to form a recess in one surface of the metal plate portion and a projection on the other surface thereof,performing chemical milling of the recess and a portion surrounding the recess, andremoving the projection by grinding.
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Accused Products
Abstract
This invention provides a hollow golf club head including a metal plate portion provided with thin and thick portions. A medium thick portion having an intermediate thickness between the thicknesses of the thin and thick portions is formed at the boundary portion between the thin and thick portions. The thin and medium thick portions are formed by the steps of pressing the metal plate portion to form a recess in one surface of the metal plate portion and a projection on its other surface, performing chemical milling of the recess and a portion surrounding it, and removing the projection by grinding.
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Citations
9 Claims
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1. A hollow golf club head including a metal plate portion provided with a thin portion and a thick portion, wherein
a medium thick portion having an intermediate thickness between a thickness of the thin portion and a thickness of the thick portion is formed at a boundary portion between the thin portion and the thick portion, and the thin portion and the medium thick portion are formed by the steps of pressing the metal plate portion to form a recess in one surface of the metal plate portion and a projection on the other surface thereof, performing chemical milling of the recess and a portion surrounding the recess, and removing the projection by grinding.
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5. A method of manufacturing a hollow golf club head, wherein
the golf club head includes a thin portion, a thick portion, and a medium thick portion which has an intermediate thickness between a thickness of the thin portion and a thickness of the thick portion, and is formed at a boundary portion between the thin portion and the thick portion, and the manufacturing method comprises in a portion where the thin portion and the medium thick portion are formed, pressing a metal plate portion which forms the golf club head to form a recess in one surface of the metal plate portion and a projection on the other surface thereof, performing chemical milling of the recess and a portion surrounding the recess, and removing the projection by grinding.
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6. A hollow golf club head including a metal plate portion provided with a thin portion and a thick portion, wherein
the thin portion is formed by the steps of forming a recess in a head inner surface of the metal plate portion and a projection on a head outer surface thereof, and removing the projection by grinding, and a low-reflection coating is applied onto the outer surface of the metal plate portion.
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9. A method of manufacturing a hollow golf club head, wherein
the golf club head includes a thin portion, a thick portion, and a medium thick portion, and the manufacturing method comprises in a portion where the thin portion is formed, forming a recess in a head inner surface of a metal plate portion which forms the golf club head and a projection on a head outer surface thereof, and removing the projection by grinding, and applying a low-reflection coating onto the outer surface of the metal plate portion.
Specification