Golf club head with stepped crown
US-8992338-B2 · Mar 31, 2015 · US
US2016166891A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016166891-A1 |
| Application number | US-201514874745-A |
| Country | US |
| Kind code | A1 |
| Filing date | Oct 5, 2015 |
| Priority date | Dec 10, 2014 |
| Publication date | Jun 16, 2016 |
| Grant date | — |
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A golf club head of the present invention includes a crown portion, a face portion, and a hosel portion. The crown portion includes a turbulence-promoting portion that extends from a heel side to a toe side and a back side.
Opening claim text (preview).
What is claimed is: 1 . A golf club head comprising a crown portion, a face portion, and a hosel portion, wherein said crown portion includes a turbulence-promoting portion that extends from a heel side to a toe side and a back side. 2 . The golf club head according to claim 1 , wherein a region of said crown portion on a side of said face portion with respect to said turbulence-promoting portion is smoother than said turbulence-promoting portion. 3 . The golf club head according to claim 1 , wherein said crown portion includes at least one other turbulence-promoting portion on the back side with respect to said turbulence-promoting portion. 4 . The golf club head according to claim 1 , wherein said turbulence-promoting portion extends in one of a line shape or a band shape. 5 . The golf club head according to claim 1 , wherein an arithmetic mean roughness Ra of said turbulence-promoting portion is 2 μm (inclusive) to 30 μm (inclusive). 6 . The golf club head according to claim 1 , wherein a concave portion is formed in an outer surface of said hosel portion on the toe side. 7 . The golf club head according to claim 1 , wherein an angle between a toe-heel direction and a virtual line that connects a heel end and a sole end of said turbulence-promoting portion is 5 degrees (inclusive) to 50 degrees (inclusive). 8 . The golf club head according to claim 1 , wherein a region of said crown portion on the back side with respect to said turbulence-promoting portion is smoother than said turbulence-promoting portion. 9 . The golf club head according to claim 1 , wherein said turbulence-promoting portion extends from a base portion of said hosel portion to a toe-side circumferential edge of said crown portion. 10 . The golf club head according to claim 1 , wherein said turbulence-promoting portion passes the back side of a top of said crown portion.
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