Golf club head
AssigneeDaiwa Seiko, Inc.
InventorsHarunobu Kusumoto, Takeshi Kasai, Atsushi Iijima, Hitoshi Tamura
Life of this patent
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Abstract
A weight piece (14) containing 15 wt. % or greater of iron and tungsten, and having a specific gravity of 9 or larger, larger than a material of a head body (10) made of steel or pure iron, is joined to the head body (10) by welding.
Claims11
A sports tool comprising a tungsten alloy part which is formed by casting process, contains 15 to 70 wt. % of tungsten, 15 to 17 wt. % of iron, and 9 to 65 wt. % of nickel, and has a specific gravity of 9 or larger.
A method of manufacturing a sports tool comprising a step of casting a tungsten alloy product which contains at least 15 to 70 wt. % of tungsten, 15 to 17 wt. % of iron, and 9 to 65 wt. % of nickel, and has a specific gravity of 9 or larger.
A golf club head comprising:
- a head body;
- and
- a weight piece containing 15 wt. % or greater of iron and tungsten, and having a specific gravity of 9 or greater, larger than a material of the head body made of steel or pure iron, the weight being joined to the head body by welding.
Dependencies are inferred from the claim text.