Golf club head and golf club
View Patent ↗An intersection point between a shaft axis Z 1 and a sole surface 18 is defined as S 1 . A point S 2 , a point S 3 , and a point S 4 are set on the sole surface 18 . An intersection point between a straight line passing through a center of gravity of the head and being perpendicular to the horizontal plane and the sole surface 18 is defined as G 1 . A point R 1 , a point R 2 , a point R 3 , and a point R 4 are set on the sole surface 18 . A section A 1 and a section A 2 are set based on the points. An angle between the shaft axis Z 1 and a ground plane is defined as θ. The angle θ exists so that at least a point belonging to the section A 1 and at least a point belonging to the section A 2 are brought into contact with the ground plane.
1. A golf club head composed of carbon fiber-reinforced plastic, titanium, a titanium alloy, stainless steel, maraging steel, an aluminum alloy, a magnesium alloy, or a tungsten-nickel alloy, said club head having a volume ranging from 100 cc to 470 cc and comprising a sole surface, wherein a face-back direction is defined as an X direction and a toe-heel direction is defined as a Y direction, said golf club head comprising a section A 1 and a section A 2 ,
wherein section A 1 is defined as a quadrangle region having the intersection point S 1 , the point S 2 , the point S 3 , and the point S 4 as apexes, provided that an intersection point between a shaft axis and the sole surface is defined as S 1 , a point on the sole surface separated by 5 mm on an X directional face side from the intersection point S 1 is defined as S 2 , a point on the sole surface separated by 5 mm on a Y directional heel side from the point S 2 is defined as S 3 , and a point on the sole surface separated by 5 mm on the Y directional heel side from the intersection point S 1 is defined as S 4 ,
wherein section A 2 is defined as a quadrangle region having the point R 1 , the point R 2 , the point R 3 , and the point R 4 as apexes, provided that, in the head in a standard condition where the head is placed on a horizontal plane, an intersection point between a straight line passing through a center of gravity of the head and being perpendicular to the horizontal plane and the sole surface is defined as G 1 , a point on the sole surface having the same X directional position as that of the intersection point G 1 and the same Y directional position as that of the intersection point S 1 is defined as R 1 , a point on the sole surface separated by 5 mm on an X directional back side from the point R 1 is defined as R 2 , a point on the sole surface separated by 5 mm on the Y directional heel side from the point R 2 is defined as R 3 , and a point on the sole surface separated by 5 mm on the Y directional heel side from the point R 1 is defined as R 4 , and
wherein a recess exists in a position on the X directional back side from the section A 2 in the sole surface, the shortest distance D 1 between said recess and the section A 2 being equal to or less than 10 mm,
said golf club head being configured so that, when it is combined with a golf club shaft into a golf club and said club is being employed to address a golf ball during play, an angle between the shaft axis and a ground plane is defined as θ, and the angle θ exists so that at least a point belonging to the section A 1 and at least a point belonging to the section A 2 are brought into contact with the ground plane, thereby stabilizing the posture of the head at address.
2. The golf club head according to claim 1 , wherein the angle θ exists so that at least a line belonging to the section A 1 and at least a line belonging to the section A 2 are brought into contact with the ground plane.
3. The golf club head according to claim 1 , further comprising a weight port provided in the recess, wherein a weight body can be attached to the weight port.
4. The golf club head according to claim 1 , wherein the recess exists in the section A 2 .
5. The golf club head according to claim 1 , wherein no protrusion part exists in the section A 1 , and no protrusion part exist in the section A 2 .
6. A golf club comprising the head according to claim 1 , a shaft, and a grip.
7. The golf club according to claim 6 , wherein the golf club has a length of greater than 43.5 inches and 47 inches or less, and the angle θ is 50 degrees or greater and 60 degrees or less.
8. The golf club according to claim 6 , wherein the golf club has a length of greater than 43.0 inches and 43.5 inches or less, and the angle θ is 50 degrees or greater and 60 degrees or less.
9. The golf club according to claim 6 , wherein the golf club has a length of greater than 42.5 inches and 43.0 inches or less, and the angle θ is 51 degrees or greater and 61 degrees or less.
10. The golf club according to claim 6 , wherein the golf club has a length of greater than 42.0 inches and 42.5 inches or less, and the angle θ is 52 degrees or greater and 62 degrees or less.
11. The golf club according to claim 6 , wherein the golf club has a length of greater than 41.5 inches and 42.0 inches or less, and the angle θ is 53 degrees or greater and 63 degrees or less.
12. The golf club according to claim 6 , wherein the golf club has a length of greater than 41.0 inches and 41.5 inches or less, and the angle θ is 54 degrees or greater and 63 degrees or less.
13. The golf club according to claim 6 , wherein the golf club has a length of greater than 40.5 inches and 41.0 inches or less, and the angle θ is 55 degrees or greater and 63 degrees or less.
14. The golf club according to claim 6 , wherein the golf club has a length of 40.0 inches or greater and 40.5 inches or less, and the angle θ is 56 degrees or greater and 63 degrees or less.
15. A golf club head according to claim 1 , having a recess provided (a1) in at least one section selected from the sections A 3 , A 4 , A 5 , A 6 , and A 7 , (a2) in at least one section selected from the sections A 3 , A 4 , A 5 , and A 6 , (a3) in at least one section selected from the sections A 3 , A 4 , and A 5 , (a4) in the section A 3 and/or the section A 4 , (a5) in the section A 5 , or (a6) in the section A 6 , or having recesses provided (a7) in at least two sections selected from the sections A 3 , A 4 , A 5 , A 6 , and A 7 , (a8) in at least two sections selected from the sections A 3 , A 4 , A 5 , and A 6 , (a9) in at least two sections selected from the sections A 3 , A 4 , and A 5 , (a10) in at least three sections selected from the sections A 3 , A 4 , A 5 , A 6 , and A 7 , or (a11) in at least three sections selected from the sections A 3 , A 4 , A 5 , and A 6 , wherein
a point S 5 is a point included in an intersection line between the sole surface and the standard central plane and having the same X direction position as that of the point S 3 , a Y directional distance between the point S 3 and the point S 5 is defined as d 1 (mm) and a point S 6 is a point on the sole surface separated by d 1 (mm) on a Y directional toe side from the point S 5 , a point S 7 is a point included in the intersection line between the sole surface and the standard central plane and having the same X directional position as that of the intersection point S 1 , a point R 5 is a point included in the intersection line between the sole surface and the standard central plane and having the same X direction position as that of the point R 3 , and a point R 6 is a point on the sole surface separated by d 1 (mm) on the Y directional toe side from the point R 5 , and
said section A 3 is a quadrangle region having the intersection point S 1 , the point S 2 , the point S 5 , and the point S 7 as apexes, said section A 4 is a quadrangle region having the point R 1 , the point R 2 , the point R 5 , and the intersection point G 1 as apexes, said section A 5 is a quadrangle region having the intersection point S 1 , the point S 4 , the point R 4 , and the point R 1 as apexes, said section A 6 is a quadrangle region having the intersection point S 1 , the point R 1 , the intersection point G 1 , and the point S 7 as apexes, and said section A 7 is a quadrangle region having the point S 5 , the point R 5 , the point R 6 , and the point S 6 as apexes.
16. A golf club head according to claim 1 , having a protrusion provided (a1) in at least one section selected from the sections A 3 , A 4 , A 5 , A 6 , and A 7 , (a2) in at least one section selected from the sections A 3 , A 4 , A 5 , and A 6 , (a3) in at least one section selected from the sections A 3 , A 4 , and A 5 , (a4) in the section A 3 and/or the section A 4 , (a5) in the section A 5 , or (a6) in the section A 6 , or having recesses provided (a7) in at least two sections selected from the sections A 3 , A 4 , A 5 , A 6 , and A 7 , (a8) in at least two sections selected from the sections A 3 , A 4 , A 5 , and A 6 , (a9) in at least two sections selected from the sections A 3 , A 4 , and A 5 , (a10) in at least three sections selected from the sections A 3 , A 4 , A 5 , A 6 , and A 7 , or (a11) in at least three sections selected from the sections A 3 , A 4 , A 5 , and A 6 ,
wherein a point R 5 is a point included in the intersection line between the sole surface and the standard central plane and having the same X direction position as that of the point R 3 , a Y directional distance between the point S 3 and the point S 5 is defined as d 1 (mm) and a point R 6 is a point on the sole surface separated by d 1 (mm) on the Y directional toe side from the point R 5 , a point S 5 is a point included in an intersection line between the sole surface and the standard central plane and having the same X direction position as that of the point S 3 , a point S 6 is a point on the sole surface separated by d 1 (mm) on a Y directional toe side from the point S 5 , and a point S 7 is a point included in the intersection line between the sole surface and the standard central plane and having the same X directional position as that of the intersection point S 1 , and said section A 3 is a quadrangle region having the intersection point S 1 , the point S 2 , the point S 5 , and the point S 7 as apexes, said section A 4 is a quadrangle region having the point R 1 , the point R 2 , the point R 5 , and the intersection point G 1 as apexes, said section A 5 is a quadrangle region having the intersection point S 1 , the point S 4 , the point R 4 , and the point R 1 as apexes, said section A 6 is a quadrangle region having the intersection point S 1 , the point R 1 , the intersection point G 1 , and the point S 7 as apexes, and said section A 7 is a quadrangle region having the point S 5 , the point R 5 , the point R 6 , and the point S 6 as apexes.