Golf club head
First Claim
1. A golf club head comprising a face which includes a bulge formed at the center of a backside thereof and having a thickness of 2.0 or more times the thickness of the thinnest part, and a plurality of ribs extended from the bulge toward a circumference of the face,wherein six or more ribs we provided as the plural ribs and an angle θ
- (°
) formed between extension directions of a respective pair of adjoining ribs is less than 90°
,wherein the maximum thickness of the bulge is not more than 3.5 times the thickness of the thinnest part, andwherein the bulge is disposed at a place including a sweet spot and has an area percentage of 2 to 5% based on the overall area of the face backside.
1 Assignment
0 Petitions
Accused Products
Abstract
A golf club head includes a face including a bulge formed at the center of a backside thereof and having a thickness of 2.0 or more times the thickness of the thinnest part, and a plurality of ribs extended from the bulge toward a circumference of the face. Six or more ribs are provided as the plural ribs and an angle θ(°) formed between extension directions of a respective pair of adjoining ribs is less than 90°. The maximum thickness of the bulge is not more than 3.5 times the thickness of the thinnest part.
122 Citations
13 Claims
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1. A golf club head comprising a face which includes a bulge formed at the center of a backside thereof and having a thickness of 2.0 or more times the thickness of the thinnest part, and a plurality of ribs extended from the bulge toward a circumference of the face,
wherein six or more ribs we provided as the plural ribs and an angle θ - (°
) formed between extension directions of a respective pair of adjoining ribs is less than 90°
,wherein the maximum thickness of the bulge is not more than 3.5 times the thickness of the thinnest part, and wherein the bulge is disposed at a place including a sweet spot and has an area percentage of 2 to 5% based on the overall area of the face backside. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A golf club head, comprising a face which includes a bulge formed at the center of a backside thereof and having a thickness of 2.0 or more times the thickness of the thinnest part, and a plurality of a ribs extended from the bulge toward a circumference of the face,
wherein six or more ribs are provided as the plural ribs and an angle θ - (°
) formed between extension directions of a respective pair of adjoining ribs is less than 90°
,wherein the maximum thickness of the bulge is not more than 3.5 times the thickness of the thinnest part, wherein the bulge is disposed at a place including a sweet spot and has an area percentage of 2 to 5% based on the overall area of the face backside, and wherein a width of a rib is in the range of 3 to 14 mm whereas a height of a rib is in the range of 0.3 to 1.5 mm. - View Dependent Claims (8)
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9. A golf club head, comprising a face which includes a bulge formed at the center of a backside thereof and having a thickness of 2.0 or more times the thickness of the thinnest part, and a plurality of ribs extended from the bulge toward a circumference of the face,
wherein six or more ribs are provided as the plural ribs and an angle θ - (°
) formed between extension directions of a respective air of adjoining ribs is less than 90°
,wherein the maximum thickness of the bulge is not more than 3.5 times the thickness of the thinnest part, wherein the bulge is disposed at a place including a sweet spot and has an area percentage of 2 to 5% based on the overall area of the face backside, and wherein a value given by dividing a rib height by a rib width [(rib height)/(rib width)] is 0.05 or more and 0.20 or less.
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10. A golf club head, comprising a face which includes a bulge formed at the center of a backside thereof and having a thickness of 2.0 or more times the thickness of the thinnest part, and a plurality of ribs extended from the bulge toward a circumference of the face,
wherein six or more ribs are provided as the plural ribs and an angle θ - (°
) formed between extension directions of a respective pair of adjoining ribs is less than 90°
,wherein the maximum thickness of the bulge is not more than 3.5 times the thickness of the thinnest part, wherein the bulge is disposed at a place including a sweet spot and has an area percentage of 2 to 5% based on the overall area of the face backside, and wherein boundary lines dividing each of the ribs from non-rib portions exist on widthwise either side of each rib, and each intersection of the boundary lines of adjoining ribs is rounded to impart a roundness of a curvature radius R=1 to 15 mm.
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11. A golf club head, comprising a face which includes a bulge formed at the center of a backside thereof and having a thickness of 2.0 or more times the thickness of the thinnest part, and a plurality of ribs extended from the bulge toward a circumference of the face,
wherein six or more ribs are provided as the plural ribs and an angle θ - (°
) formed between extension directions of a respective pair of adjoining ribs is less than 90°
,wherein the maximum thickness of the bulge is not more than 3.5 times the thickness of the thinnest part, wherein the bulge is disposed at a place including a sweet spot and has an area percentage of 2 to 5% based on the overall area of the face backside, and wherein boundary lines dividing each of the ribs from non-rib portions exist on widthwise either side of each rib, and each intersection of the boundary lines of adjoining ribs is rounded to impart a roundness of a curvature radius R, and wherein a value of a ratio (θ
/R) between the curvature radius R(mm) and an angle θ
(°
) between the adjoining ribs is defined to range from 3 to 50.
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12. A golf club head, comprising a face which includes bulge formed at the center of a backside thereof and having a thickness of 2.0 or more times the thickness of the thinnest part, and a plurality of ribs extended from the bulge toward a circumference of the face,
wherein six or more ribs are provided as the plural ribs and an angle θ - (°
) formed between extension directions of a respective pair of adjoining ribs is less than 90°
,wherein the maximum thickness of the bulge is not more than 3.5 times the thickness of the thinnest part, wherein the bulge is disposed at a place including a sweet spot and has an area percentage of 2 to 5% based on the overall area of the face backside, and wherein boundary lines dividing each of the ribs from non-rib portions exist on widthwise either side of each rib, and each intersection of the boundary lines of adjoining ribs is rounded to impart a roundness of a curvature radius R, and wherein relationships R(1)≧
R2≧
. . .≧
R(m) and R(1)≧
R(m) are satisfied, provided that plural angles θ
, each of angles θ
being defined by respective pair of adjoining ribs, are represented by θ
(1), θ
(2), . . . , θ
(m) in the descending order of the values thereof, that an inter-rib curvature radius R with respect to the angle θ
(1) is represented by R(1), that an inter-rib curvature radius R with respect to the angle θ
(2) is represented by R(2), . . . , and that an inter-rib curvature radius R with respect to the angle θ
(m) is represented by R(m).
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13. A golf club head comprising a face which includes a bulge formed at the center of a backside thereof a plurality of ribs extended from the bulge toward a circumference of the face, and non-rib portions each being arranged between adjacent ribs and each having a thickness smaller than that of the bulge and that of a rib, wherein six or more ribs are provided as the plural ribs and an angle θ
- (°
) formed between extension directions of a respective pair of adjoining ribs is less than 90°
; andwherein boundary lines dividing each of the ribs from non-rib portions exist on widthwise either side of each rib, and each intersection of the boundary lines of adjoining ribs is rounded to impart a roundness of a curvature radius R=1 to 15 mm.
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Specification