Iron golf-club head and an iron golf club including the same
View Patent ↗A configuration of an iron golf-club head is defined as follows in order to offer ease of addressing a ball with face open. In a projected figure of the head focused on a projection plane including a sweet spot and normal to a perpendicular from a center of gravity of the head to a face thereof, a maximum transversal is defined by a straight line cutting across a face contour over the greatest length as passing through an intersection of a leading edge and a straight line drawn from a heel-side end point of a face line in a predetermined direction of the projected figure, and forms an angle of 39° to 50° (inclusive) relative to a horizontal line. The face contour has a radius of curvature of 10 mm to 22 mm (inclusive) in the vicinity of a toe-side intersection of the face contour and the maximum transversal.
1. An iron golf-club head having (1) a loft angle of 45° or more, (2) a leading edge and (3) a face bounded by a face contour and having at least one face line inclined at an angle of 2° or less relative to a horizontal direction as determined in a reference position, where the head is placed on a horizontal plane at a predetermined lie angle and the predetermined loft angle, wherein
in a projection of the face on a projection plane that includes the sweet spot on the face and is normal to a line that (1) extends through the center of gravity of the head and (2) is normal to the face,
a maximum transversal, defined as the longest straight line cutting across the face contour and extending through (1) an intersection of the leading edge and a straight line drawn from a heel-side end point of the at least one face line in a predetermined direction along the projection plane and (2) an upper toe-side of the face contour, forms an angle in a range of 39° to 50° with an intersection defined by the projection plane and the horizontal plane, and wherein
the face contour has a radius of curvature in the range of 10 mm to 22 mm in the vicinity of a toe-side intersection of the face contour and the maximum transversal.
2. An iron golf-club head according to claim 1 , wherein the leading edge has a radius of curvature in the range of 110 mm to 140 mm, in the projection plane.
3. An iron golf club comprising an iron golf-club head and a shaft attached to the club head, wherein the iron golf-club head has (1) a loft angle of 45° or more, (2) a leading edge and (3) a face bounded by a face contour and having at least one face line inclined at an angle of 2° or less relative to a horizontal direction as determined in a reference position, where the head is placed on a horizontal plane at a predetermined lie angle and the predetermined loft angle, and wherein:
in a projection of the face on a projection plane that includes the sweet spot on the face and is normal to a line that (1) extends through the center of gravity of the head and (2) is normal to the face,
a maximum transversal, defined as the longest straight line cutting across the face contour and extending through (1) an intersection of the leading edge and a straight line drawn from a heel-side end point of the at least one face line in a predetermined direction along the projection plane and (2) an upper toe-side of the face contour, forms an angle in a range of 39° to 50° with an intersection defined by the projection plane and the horizontal plane, and wherein
the face contour has a radius of curvature in the range of 10 mm to 22 mm in the vicinity of a toe-side intersection of the face contour and the maximum transversal.
4. An iron golf club according to claim 3 , wherein the leading edge has a radius of curvature in the range of 110 mm to 140 mm, in the projection plane.