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US 5,507,985 AGranted
Method of making a foamed core golf club having a core density gradient
AssigneeDunlop Slazenger Corporation
InventorLauro C. Cadorniga
Life of this patent
Estimating the term…
Abstract
A wood type metal golf club head having a hollow metal head and the cavity within filled with a thermoplastic material produced from a thermoplastic polymer, filler and chemical blowing agent in a manner so that the material in the cavity has a dense outer skin adjacent the surfaces of the cavity and a cellular central area and the finished product reduces the undesirable metallic sound made during hitting.
Claims7
A process for manufacturing a metal wood golf club head comprising the steps of:
- a. providing a metal wood golf club head having a cavity within a metal body;
- b. cooling the metal wood golf club head;
- c. forming a mixture of a thermoplastic polymer, a chemical blowing agent and a filler material;
- d. injecting in one second or less between 5 and 30 grams of the mixture into the cavity of the cooled metal wood golf club head, the mixture being at a sufficient temperature to activate the blowing agent such that a blown cellular structure is formed;
- and
- e. holding the mixture in the cooled golf club head for a time sufficient to form a central to peripheral ascending gradient density composition in the golf club head.
3 more elements
Dependencies are inferred from the claim text.