JP-7855953-B2 - Golf club head

Inventors

• 島原 佑樹

Assignees

• 住友ゴム工業株式会社

Dates

Publication Date

20260511

Application Date

20220707

Claims (4)

1. It comprises a striking face having multiple scorelines, a sole surface, a leading edge forming the front edge of the sole surface, a trailing edge forming the rear edge of the sole surface, and a scoreline center position determined based on the scorelines. The sole surface has a ridge extending from the toe side to the heel side and an additional surface that is flat or concave. In the region where the additional surface exists, the ridge line is interrupted. The aforementioned ridge is composed of a heel ridge located on the heel side of the added surface and a toe ridge located on the toe side of the added surface. An iron-type golf club head in which, in a plan view, the line segment connecting the toe-side endpoint of the heel ridge and the heel-side endpoint of the toe ridge intersects the added surface .
2. The golf club head according to claim 1, wherein the additional surface is the concave surface.
3. The additional surface includes a toe portion located to the toe side of the scoreline center position and a heel portion located to the heel side of the scoreline center position. The golf club head according to claim 1 or 2, wherein the toe-heel length of the heel portion is greater than the toe-heel length of the toe portion.
4. When the height of the lowest point of the leading edge from the ground plane in the reference state of the head is defined as the leading edge height, The golf club head according to claim 1 or 2, wherein the reduction in the leading edge height due to the added surface is 0.5 mm or more and 2.0 mm or less.

Description

This invention relates to a golf club head. An iron-type golf club head with a distinctive sole shape has been proposed. The golf club head disclosed in Japanese Patent Publication No. 2015-186514 has a face with scorelines and a sole with recesses. These recesses are formed only on the toe side of the scoreline's longitudinal center. Alternatively, the length of these recesses on the toe side is longer than the length on the heel side of the longitudinal center. This head makes it difficult for the face to rotate in the closing direction. Japanese Patent Publication No. 2015-186514 Figure 1 is a front view of a golf club head according to the first embodiment.Figure 2 is a bottom view of the golf club head shown in Figure 1.Figure 3 is a cross-sectional view along the line A-A in Figure 2.Figure 4 is a cross-sectional view along the line B-B in Figure 2.Figure 5(a) is an enlarged view of the area within the rectangle in Figure 4, and Figure 5(b) is a partial enlarged view of the cross section along the line C-C in Figure 2.Figure 6 is a front view of the golf club head according to the second embodiment.Figure 7 is a bottom view of the golf club head shown in Figure 6.Figure 8 is a cross-sectional view along the line A-A in Figure 7.Figure 9 is a cross-sectional view along the line B-B in Figure 7.Figure 10(a) is a magnified section of Figure 2, and Figure 10(b) is a magnified section of Figure 7.Figure 11 is a bottom view of the golf club head according to the third embodiment.Figure 12 is a conceptual diagram illustrating the reference state. The embodiments will be described in detail below, with reference to drawings as appropriate. In this application, the following terms are defined: [Standard state] The standard state is when the scorelines and the ground plane HP are parallel, and the club head is placed on the ground plane HP. In this standard state, the central axis Z (shaft axis) of the shaft hole in the club head is located within the inclined reference plane SP, which is inclined at 6 degrees relative to the vertical plane VP (see Figure 12). The vertical plane VP is a plane perpendicular to the ground plane HP. The inclined reference plane SP is a plane that makes an angle of 6 degrees with the vertical plane VP and is inclined at 6 degrees toward the face side (forward side) relative to the vertical plane VP. In this standard state, the scorelines are parallel to the ground plane HP and also parallel to the inclined reference plane SP. This standard state corresponds to the position of the club head when addressing the ball with a 6-degree hand-forward position. [Toe-heel direction] In the head in the aforementioned reference state, the direction of the intersection line between the inclined reference plane SP and the ground plane HP is the toe-heel direction. This toe-heel direction is parallel to the scorelines. [Face-to-back direction] The direction perpendicular to the toe-heel direction and parallel to the ground plane HP is the face-back direction. The face-back direction is also the front-back direction. The face side is also called the front side. The back side is also called the rear side. [vertical direction] The direction that is perpendicular to the toe-heel direction and perpendicular to the face-back direction is the up-down direction. [Reference position of the toe] The toe reference point is located 18 mm from the point closest to the toe on the club head towards the heel (see Figure 1). In a typical iron-type golf club head, the toe-side end of the scoreline coincides with the toe reference point. The toe reference point is the position in the toe-heel direction. [Heel reference position] Each scoreline has a heel-side end. The position of the furthest heel-side end is the heel reference point. In a typical iron-type golf club head, the heel-side end of the longest scoreline coincides with the heel reference point. The heel reference point is the position in the toe-heel direction. [Center position of the scoreline] The scoreline center position is the point that bisects the distance between the toe reference point and the heel reference point. In a typical iron-type golf club head, the center of the longest scoreline coincides with the scoreline center position. The scoreline center position is the position in the toe-heel direction. [Leading Edge] In the cross-section of the club head along the face-to-back direction, the point located furthest forward is determined. This point is determined at each position in the toe-to-heel direction. The set of these points is the leading edge. The leading edge is the front edge of the sole surface. [Trailing edge] The trailing edge is the trailing edge of the sole surface. When the radius of curvature of the sole surface is measured sequentially toward the rear in a cross-section of the head along the face-to-back direction, the point where the radius of curvature first becomes 5 mm or less is determined. The set of these points is de