CPC A63B 53/0466 (2013.01) [A63B 53/045 (2020.08); A63B 53/0412 (2020.08); A63B 53/0433 (2020.08)] | 19 Claims |
1. A hollow body golf club head comprising:
a body having a front end;
a back end opposite the front end;
a crown;
a sole opposite the crown, the sole defining a sole surface;
wherein a ground plane is tangent to the sole surface when the golf club head is at an address position to strike a golf ball;
a heel;
a toe opposite the heel, and a hosel structure having a hosel axis extending centrally through a bore in the hosel structure;
an interval cavity;
a strikeface positioned at the front end and defining a geometric center, and a loft plane tangent to the geometric center;
wherein the geometric center further defines a coordinate system having the geometric center;
the coordinate system comprising an X axis extending through the geometric center between the heel and the toe;
a Y axis extending through the geometric center and perpendicular to the X axis, between the crown and the sole;
a Z axis extending through the geometric center and perpendicular to the X axis and to the Y axis, between the front end and the back end;
the X axis and the Z axis together define an XZ plane extending between the heel and toe and between the front end and the back end;
the Y axis and the Z axis together define a YZ plane extending between the crown and the sole and between the front end and the back end;
an indented region;
wherein the indented region is defined where the sole veers inward in a direction toward the internal cavity;
a sole transition point defined by an intersection of the sole and the strikeface;
the indented region comprises a sole curvature profile defined by an intersection of the sole surface and the YZ plane;
wherein the sole curvature profile comprises a first inflection point and a second inflection point;
wherein the sole curvature profile comprises a first concave section extending from the sole transition point to the first inflection point and is concave relative to the XZ plane;
a convex section extending from the first inflection point to the second inflection point and is convex relative to the XZ plane;
a second concave section extending from the second inflection point to the back end and is concave relative to the XZ plane;
wherein:
the first concave section comprises a radius of curvature (R3);
the convex section comprises a radius of curvature (R4);
the second concave section comprises a radius of curvature (R5);
the sole curvature profile further comprises a nadir and a nadir depth ratio;
the nadir represents a point on the sole curvature profile that is closest to the XZ plane;
the nadir is located on the convex section;
wherein the nadir depth ratio is defined as a ratio of a depth of the nadir to a depth of the golf club head; and wherein the nadir depth ratio is between 0.40 and 0.50;
a face-sole transition profile located where the strikeface transitions to the sole, the face-sole transition profile comprising a face-sole transition radius of curvature;
wherein the face-sole transition radius of curvature is less than 0.5 inches; and
wherein no portion of the sole intersected by the YZ plane includes a radius of curvature greater than 10 inches between the front end and the back end.
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