KR102629705B1 - Iron-type golf club head - Google Patents

Abstract

(Problem) The object of the present invention is to provide an iron-type golf club head capable of sufficiently enhancing the feel of impact.
(Solution) The iron-type golf club head 10 according to one aspect of the present invention includes a face portion 1 and a sole portion 2 extending rearward from the lower edge of the face portion 1. A club head (10) is provided with a rib (8) connected to the sole portion (2) and disposed on the back of the face portion (1), and the rib (8) extends from the sole portion (2) to the face portion (1). A first circle with a radius of 10 mm centered on a projection point obtained by projecting the centroid of the back surface 1b or the centroid of the front surface 1a of the face portion 1 onto the back surface 1b, and the golf club head 10. Up to an elliptical area surrounded by a second circle with a radius of 10 mm centered on the projection point where the center of gravity is projected onto the back surface 1b, and two parallel line segments circumscribed by the first and second circles. It is extended.

Description

Iron type golf club head {IRON-TYPE GOLF CLUB HEAD}

The present invention relates to an iron-type golf club head.

A quality required for an iron-type golf club head is good feel. In order to improve the feel, it is desired to control the vibration of the face portion. From this perspective, in golf club heads where the coefficient of restitution is increased by reducing the thickness of the face portion, ribs are sometimes arranged on the back side of the face portion (see specification in U.S. Patent Application Publication No. 2017/028270).

US Patent Application Publication No. 2017/028270 Specification

Patent Document 1 describes forming a pair of ribs parallel to each other on the back side of the face portion. Patent Document 1 describes that a pair of ribs is formed to extend in the vertical direction from the lower part of the face part to the upper part at a position away from the face part.

However, as a result of careful study by the present inventors, it was found that it is difficult to sufficiently increase the feeling of impact depending on the ribs described in this publication.

The present invention has been made based on these circumstances, and the object of the present invention is to provide an iron-type golf club head capable of sufficiently enhancing the feeling of impact.

An iron-type golf club head according to one aspect of the present invention made to solve the above problem is an iron-type golf club head having a face portion and a sole extending rearward from the lower edge of the face portion, and is connected to the sole portion, Also, it has a rib disposed on the back of the face portion, and the rib has a radius of 10 mm centered on a projection point obtained by projecting the centroid of the back of the face portion from the sole portion or the centroid of the front surface of the face portion onto the back surface. Surrounded by a circle, a second circle with a radius of 10 mm centered on a projection point where the center of gravity of the golf club head is projected onto the back surface, and two parallel line segments circumscribed by the first circle and the second circle. It extends into an oval-shaped area.

The iron-type golf club head preferably has a lateral moment of inertia of 4000 g·cm2 or more.

It is good if the area of the front surface of the face part is 36.7 cm2 or more.

The upper end of the rib may be located within the oval-shaped area.

The upper end of the rib may be located on an imaginary straight line passing through the center of the first circle and the center of the second circle, or may be located above the imaginary straight line.

The minimum distance between the center of the first circle and the rib may be less than or equal to the minimum distance between the center of the second circle and the rib.

The rib may be inclined from the toe side toward the heel side from the sole portion toward the oval-shaped area.

The rib may be connected to the sole portion at a position on the toe side.

The height of the rib within the oval-shaped region is preferably 5 mm or more.

The sole portion may have a groove extending in the toe/heel direction, and the rib may be connected to the bottom and side surfaces of the groove.

In addition, in the present invention, “front” means the striking side, and “back” means the opposite side. “Front surface of face portion” refers to the area on the toe side of the front surface of the golf club head rather than the boundary line on the toe side of the heel portion (see the area within the thick border in FIG. 5). “The back of the face” means the flat surface facing the front of the face (see the area surrounded by the thick solid line and thick broken line in FIG. 6). Additionally, “flat surface” includes a shape having irregularities whose height or depth is 0.5 mm or less. “A projection point where the center of gravity of the golf club head is projected onto the back” means a projection point where the center of gravity of the golf club head is projected in the normal direction of the front surface of the face with respect to the back of the face. “Transverse moment of inertia” refers to the moment of inertia around the vertical axis passing through the center of gravity of the golf club head when the iron-type golf club head is installed on a horizontal surface so that the loft angle and lie angle are preset. “The ribs are connected to the sole and toe sides” means that the ribs are connected to the sole and toe sides with the center of the toe-heel direction on the back of the face as a reference. In addition, “toe-heel direction” means a horizontal direction perpendicular to the front-back direction when the iron-type golf club head is installed on a horizontal surface so that the loft angle and lie angle are preset.

The iron-type golf club head according to one aspect of the present invention can improve the feeling of hitting by selectively forming ribs on the back of the vibrating portion of the face portion.

1 is a schematic front view (front view) showing an iron-type golf club head according to an embodiment of the present invention.
Figure 2 is a schematic rear view of the iron-type golf club head of Figure 1.
FIG. 3 is a partial enlarged view showing the arrangement of ribs of the iron-type golf club head of FIG. 2.
FIG. 4 is a cross-sectional view taken along line IV-IV of the iron-type golf club head of FIG. 2.
Figure 5 is a schematic diagram for explaining the front surface of the face portion of the iron-type golf club head of Figure 1.
FIG. 6 is a schematic diagram for explaining the back of the face portion of the iron-type golf club head of FIG. 1.
FIG. 7 is a schematic rear view showing an iron-type golf club head according to an embodiment different from the iron-type golf club head of FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with appropriate reference to the drawings.

[First Embodiment]

<Iron type golf club head>

The iron-type golf club head 10 (hereinafter, simply referred to as “golf club head 10”) of FIGS. 1 to 4 has a face portion 1 and a face portion extending rearward from the lower edge of the face portion 1. It is provided with a brush part (2). In addition, the golf club head 10 includes a top portion 3 extending rearward from the upper edge of the face portion 1, and a toe portion 4 extending rearward from the toe side (tip side) of the face portion 1. ), a heel portion 5 formed on the heel side (opposite to the tip side) of the face portion 1, and a hosel portion 6 formed continuously to the heel portion 5. Additionally, the golf club head 10 has a rear wall portion 7 that extends from the rear end of the sole portion 2 and protrudes upward away from the rear surface 1b of the face portion 1. The golf club head 10 is connected to the sole portion 2 and has a rib 8 disposed on the back surface 1b of the face portion 1. The golf club head 10 is used as an iron-type golf club (X) with the shaft 9 connected to the hosel portion 6. The golf club head 10 is mainly made of metal or alloy such as iron and stainless steel.

The golf club head 10 is preferably designed with the intention of increasing the directionality of the batted ball. More specifically, the golf club head 10 reduces the thickness of the face portion 1 (distance between the front surface 1a and the back surface 1b of the face portion 1) while reducing the thickness of the front surface 1a of the face portion 1. It is designed to increase the lateral moment of inertia by increasing the area (i.e., increasing the length in the toe and heel directions). Due to the thickness of the face portion of such a golf club head becoming thinner, the rigidity of the face portion decreases and the feel at impact deteriorates. In contrast, the golf club head 10 improves the feel by disposing ribs 8 on the back surface 1b of the face portion 1.

The lower limit of the lateral moment of inertia of the golf club head 10 is preferably 4000 g·cm2, and more preferably 4100 g·cm2. The golf club head 10 can sufficiently increase the directionality of a batted ball by having a lateral moment of inertia greater than the lower limit. In addition, even if the golf club head 10 has such a large moment of inertia, an increase in the overall weight of the golf club head 10 is suppressed by controlling the arrangement of the ribs 8, as will be described later, and the lateral moment of inertia is reduced. It is possible to achieve both augmentation and improvement in feel. Additionally, the golf club head 10 is capable of both increasing the lateral moment of inertia and improving feel, and there is no particular limitation on the upper limit of the lateral moment of inertia. However, due to the configuration of the golf club, realistically, the upper limit of the lateral moment of inertia can be set to, for example, 4600 g·cm2.

(face part)

The face portion 1 has a front surface 1a (see the area within the thick border in FIG. 5) constituting the striking surface, and a back surface 1b on the opposite side of the front surface 1a (as indicated by thick solid lines and thick broken lines in FIG. 6). (see enclosed area). A plurality of score lines 11 are formed on the front surface 1a. A plurality of score lines 11 extend in the toe-heel direction at intervals in the vertical direction.

The lower limit of the area of the front surface 1a of the face portion 1 is preferably 36.7 cm 2 and more preferably 37.7 cm 2 . The golf club head 10 can have a sufficiently large lateral moment of inertia by having the area of the front surface 1a of the face portion 1 equal to or greater than the lower limit. On the other hand, when the area of the front surface 1a of the face portion 1 is greater than the above lower limit, the thickness of the face portion 1 becomes thinner and the face portion 1 tends to vibrate, which is likely to cause deterioration of the feel. In contrast, the golf club head 10 can suppress an increase in the overall weight of the golf club head 10 and improve the feel by controlling the arrangement of the ribs 8. In addition, the golf club head 10 is capable of increasing the hitting feel by increasing the area of the front surface 1a of the face portion 1, and the upper limit of the area of the front surface 1a of the face portion 1 is There is no particular limitation. However, due to the configuration of the golf club, realistically, the upper limit of the above area can be set to, for example, 40.7 cm2.

(Solbu)

The sole portion 2 extends rearward from the lower edge of the face portion 1 and is connected to the toe portion 4 at an end on the toe side and with the heel portion 5 at an end on the heel side. The sole portion 2 has a thin plate shape with the toe-heel direction as the longitudinal direction and the front-to-back direction as the width direction.

As shown in Figs. 2 to 4, the sole portion 2 has a groove 2a extending in the toe-heel direction. The sole portion 2 has a groove 2a to increase the bending property of the face portion 1.

As shown in Fig. 4, the groove 2a may be directly connected to the back surface 1b of the face portion 1. That is, the front side of the groove 2a may also serve as the back surface 1b of the face portion 1. According to this configuration, it is difficult for the sole portion 2 to interfere with the bending of the face portion 1.

(posterior wall)

The rear wall portion 7 contributes to increasing the lateral moment of inertia of the golf club head 10 by relatively increasing the weight of the golf club head 10 in a horizontal direction away from the center of gravity. The front surface of the rear wall portion 7 also serves as the rear side of the groove 2a formed in the sole portion 2. The rear wall portion 7 has a high-rigidity portion 7a on the toe side in the toe-heel direction, which has high rigidity relative to other portions. The high-rigidity portion 7a is, for example, an expanded portion with an expanded cross-sectional area perpendicular to the toe-heel direction. The golf club head 10 can easily increase the lateral moment of inertia by having the rear wall portion 7 having a high rigidity portion 7a.

(live)

As shown in FIGS. 2 to 4, the rib 8 extends upward from the sole portion 2. 2 and 3, the rib 8 has a radius centered on a projection point G1' obtained by projecting the centroid G1 of the front surface 1a of the face portion 1 onto the back surface 1b. A first circle (C1) of 10 mm and a second circle (C1) of radius 10 mm centered on a projection point (G2') where the center of gravity of the golf club head (10) is projected onto the back surface (1b) of the face portion (1). It extends into an elliptical region R1 surrounded by the circle C2 and two parallel line segments L1 and L2 circumscribed by the first circle C1 and the second circle C2. The first circle C1 is a virtual circle drawn on the back surface 1b of the face portion 1 with the projection point G1' as the center. Additionally, the second circle C2 is a virtual circle drawn on the back surface 1b of the face portion 1 with the projection point G2' as the center.

The golf club head 10 is intended to increase the feel of the shot while suppressing an increase in the overall weight of the golf club head 10. Therefore, it is preferable that the ribs 8 are selectively formed at positions suitable for enhancing the feel. From this viewpoint, the ribs 8 are selectively formed on portions of the face portion 1 that are prone to vibration. In more detail, when the face portion 1 is bent around the shaft 9 and the heel portion 5 continuous from the shaft 9, the centroid of the front surface 1a of the face portion 1 ( G1) may be the part that is most susceptible to vibration among the face portion 1. Additionally, upon impact of a batted ball, the contact area of the front surface 1a of the face portion 1 with the batted ball is usually circular with a radius of about 10 mm. Therefore, the first circle C1 corresponds to the area most likely to vibrate upon impact of a batted ball. In addition, the golf club head 10 tends to have relatively low rigidity near the projection point G2' from the viewpoint of increasing the lateral moment of inertia. For this reason, the second circle C2 corresponds to an area where the face portion 1 is prone to vibration. From these details, the oval-shaped region R1 consisting of the first circle C1, the second circle C2, and the region sandwiched between these two circles C1 and C2 is the golf club head 10. ), it corresponds to an area prone to vibration of the face portion 1. Therefore, since the rib 8 extends from the sole portion 2 into the oval-shaped region R1, vibration of the face portion 1 can be efficiently suppressed by the rib 8, and the golf club head (10) It is possible to increase the feeling of impact while suppressing the increase in overall weight. Additionally, the golf club head 10 may be provided with ribs other than the ribs 8. However, it is preferable that the golf club head 10 has only one rib 8 from the viewpoint of suppressing an increase in the overall weight of the golf club head 10.

The rib 8 is directly connected to the back surface 1b of the face portion 1 without any other member intervening. The ribs 8 are plate-shaped in the thickness direction in the toe-heel direction. The thickness of the ribs 8 may be uniform. It is desirable that the upper end of the rib 8 does not reach the top part 3. That is, it is desirable that a gap is formed between the upper end of the rib 8 and the top part 3. The golf club head 10 can reduce the size of the ribs 8 by shortening the length of the ribs 8 in the vertical direction, thereby suppressing an increase in the overall weight of the golf club head 10.

As long as the rib 8 extends into the elliptical region R1, it may exceed the elliptical region R1 and extend upwards from the elliptical region R1. That is, in the present invention, “the rib extends within the elliptical region” includes the configuration in which the rib extends to a position exceeding the elliptical region. However, the upper end of the rib 8 is preferably located within the oval-shaped region R1. In the golf club head 10, the rib 8 fixed to the sole portion 2 extends into the oval-shaped region R1, thereby suppressing vibration in the oval-shaped region R1 and improving the feeling of hitting. there is. Therefore, by positioning the upper end of the rib 8 within the oval-shaped region R1, the rib 8 is miniaturized within the range where the effect of improving the feel is obtained, and the weight of the entire golf club head 10 is reduced. The increase can be suppressed.

The upper end of the rib 8 may be positioned below an imaginary straight line V passing through the center of the first circle C1 and the center of the second circle C2. However, as shown in FIG. 3, the upper end of the rib 8 is located on an imaginary straight line (V) passing through the center of the first circle (C1) and the center of the second circle (C2) or an imaginary straight line (V) It is preferable to be located more upwardly. According to this configuration, vibration of the face portion 1 at the time of impact of a batted ball can be more easily suppressed, and the feeling of hitting is easily improved.

In addition, when the upper end of the rib 8 is located on the virtual straight line V or is located above the virtual straight line V, the rib 8 is located between the center of the first circle C1 and the second circle C2. ) is preferably extended on a line segment connecting the centers.

When the first circle (C1) and the second circle (C2) intersect each other, the ribs (8) are preferably extended to an area included in both the first circle (C1) and the second circle (C2). . According to this configuration, vibration of the face portion 1 at the time of impact of a batted ball can be more easily suppressed, and the feeling of hitting is easily improved.

It is preferable that the minimum distance between the center of the first circle C1 and the ribs 8 is less than or equal to the minimum distance between the center of the second circle C2 and the ribs 8. Since the ribs 8 are formed close to the first circle C1, which is the most susceptible part of the face 1 to vibrate, vibration of the face 1 during impact of a batted ball is made easier. It can be suppressed. In addition, if the minimum distance between the center of the first circle (C1) and the ribs (8) is less than or equal to the minimum distance between the center of the second circle (C2) and the ribs (8), the center of the first circle (C1) and the ribs (8) ), the minimum distance may be 0. That is, the rib 8 may be disposed at the center of the first circle C1.

The ribs 8 are preferably inclined from the toe side toward the oval-shaped region R1 from the sole portion 2 toward the heel side. As described above, the golf club head 10 has a high rigidity portion 7a formed on the toe side of the rear wall portion 7. Therefore, when the rib 8 is inclined from the toe side to the heel side toward the oval-shaped region R1 from the sole portion 2, the rib 8 is connected to the high rigidity portion 7a, or at least to the high rigidity portion 7a. ) is connected to a location close to . According to this configuration, the rib 8 can be connected to a portion of the golf club head 10 that is difficult to vibrate (that is, the rib 8 is connected to a portion of the golf club head 10 that is difficult to vibrate) (can be extended to a portion), it is easy to increase the feel of the golf club head 10.

The rib 8 extends in a straight line from its lower end to its upper end. According to this configuration, by reducing the length of the ribs 8, it is easy to effectively increase the feeling of impact while suppressing an increase in the weight of the golf club head 10.

The rib 8 is preferably connected to the sole portion 2 at a position on the toe side. Additionally, it is more preferable that the ribs 8 are connected to the high rigidity portion 7a. According to this configuration, the rib 8 can be connected to a portion of the golf club head 10 that is difficult to vibrate, so it is easy to improve the hitting feel of the golf club head 10.

As shown in Fig. 4, the rib 8 is connected to the groove 2a of the sole portion 2. The ribs 8 are preferably connected to the bottom and sides of the groove 2a. In other words, it is preferable that the lower end of the rib 8 is inserted into the groove 2a. In FIG. 4, the rib 8 is formed on the front side of the groove 2a (i.e., the back surface 1b of the face portion 1), the bottom surface of the groove 2a (i.e., the upper surface of the sole portion 2), and the front side of the groove 2a. , It is connected to the rear side of the groove 2a (that is, the front surface of the rear wall portion 7). The golf club head 10 can easily suppress vibration of the ribs 8 by connecting the ribs 8 to the bottom and side surfaces of the grooves 2a. As a result, it is easy to easily and reliably enhance the feeling of impact.

It is preferable that the height of the ribs 8 (length in the direction perpendicular to the back surface 1b of the face portion 1) in the elliptical region R1 is 5 mm or more. That is, the minimum height of the ribs 8 within the elliptical region R1 is preferably 5 mm. If the height does not satisfy the lower limit, the ribs 8 tend to vibrate upon impact of a batted ball, and there is a risk that the feel of the golf club head 10 cannot be sufficiently improved. Additionally, the upper limit of the height of the rib 8 in the elliptical region R1 is not particularly limited, but is preferably 10 mm and more preferably 7 mm from the viewpoint of suppressing the weight of the rib 8 from increasing. do.

The maximum height (maximum length in the vertical direction with respect to the back surface 1b of the face portion 1) of the ribs 8 in the area connected to the groove 2a is preferably 8 mm or more. If the maximum height does not satisfy the lower limit, the ribs 8 tend to vibrate upon impact of a batted ball, and there is a risk that the feel of the golf club head 10 cannot be sufficiently improved. Additionally, the upper limit of the maximum height of the rib 8 in the area connected to the groove 2a is not particularly limited, but is preferably 12 mm from the viewpoint of suppressing the weight of the rib 8 from increasing, and 10 mm. It is more desirable.

As shown in Fig. 4, the height of the rib 8 may gradually increase from its upper end toward the side connected to the groove 2a (the side where the height is maximum). According to this configuration, the weight of the ribs 8 can be reduced while suppressing the vibration of the ribs 8 upon impact of a batted ball, thereby suppressing an increase in the weight of the golf club head 10.

<Advantage>

The golf club head 10 can improve the feeling of hitting by selectively forming ribs 8 on the back surface 1b of the face portion 1 that is prone to vibration.

[Second Embodiment]

<Golf Club Head>

The golf club head 20 of FIG. 7 has a face portion 1 and a sole portion 2 extending rearward from the lower edge of the face portion 1. The golf club head 20 is connected to the sole portion 2 and has a rib 18 disposed on the back surface 1b of the face portion 1.

The golf club head 20 can have the same structure as the golf club head 10 in FIG. 1 except that the ribs 18 are arranged differently. Therefore, only the arrangement of the ribs 18 will be described below.

(live)

The rib 18 has a first circle C11 with a radius of 10 mm centered on the centroid G11 of the back surface 1b of the face portion 1 and the center of gravity of the golf club head 20 in the face portion 1. ), a second circle C2 with a radius of 10 mm centered on the projection point G2' projected on the back surface 1b, and parallel circles circumscribed to the first circle C11 and the second circle C2. It extends to an oval-shaped region R11 surrounded by two line segments L11 and L12. The first circle (C11) is a virtual circle drawn on the back surface (1b) of the face portion (1) with the centroid (G11) as the center, and the second circle (C2) is a virtual circle with the projection point (G2') as the center. It is a virtual circle drawn on the back (1b) of part (1). That is, the first circle C1 of the golf club head 10 in FIG. 1 has a projection point G1' obtained by projecting the centroid G1 of the front surface 1a of the face portion 1 onto the back surface 1b. Compared to the center, the first circle C11 of the golf club head 20 is centered on the centroid G11 of the back surface 1b of the face portion 1.

In the golf club head 20, ribs 18 are selectively formed on portions of the face portion 1 that are prone to vibration. In more detail, in the golf club head 20, a sole portion 2, a top portion 3, a toe portion 4, and a heel portion 5 are formed on the peripheral edge of the back surface 1b of the face portion 1. is formed in a frame shape. In other words, the face portion 1 is fixed by the sole portion 2, the top portion 3, the toe portion 4, and the heel portion 5 at the peripheral edge portion on the back side. Therefore, the centroid G11 of the back surface 1b of the face portion 1 may be the part of the face portion 1 that is most susceptible to vibration. Accordingly, the oval-shaped region R11 consisting of the first circle C11, the second circle C2, and the region sandwiched between these two circles C11 and C2 is in the golf club head 20. It corresponds to an area of the face portion 1 that is prone to vibration. Therefore, since the rib 18 extends from the sole portion 2 to the elliptical region R11, the vibration of the face portion 1 can be efficiently suppressed by the rib 18, thereby improving the golf club head ( 20) It is possible to increase feel while suppressing the increase in overall weight.

Except that the center of the first circle C11 is different from that of the golf club head 10 in FIG. 1, the specific configuration of the rib 18 can be the same as that of the rib 8 in FIG. 1. For example, the position of the upper end of the rib 18 with respect to the oval-shaped region R11, the inclination direction of the rib 18, the connection position between the rib 18 and the sole portion 2, the height of the rib 18, etc. can be done similarly to the rib 8 of FIG. 1.

<Advantage>

The golf club head 20, like the golf club head 10 of FIG. 1, can improve the feeling of hitting by selectively forming ribs 18 on the back surface 1b of the prone portion of the face portion 1. .

[Other embodiments]

The above embodiment does not limit the configuration of the present invention. Accordingly, the above embodiment may omit, substitute, or add components of each part of the above embodiment based on the description and technical common sense of the present specification, and they should all be construed as falling within the scope of the present invention.

For example, as long as the rib extends to the oval-shaped area, it is possible to make the minimum distance between the center of the first circle and the rib larger than the minimum distance between the center of the second circle and the rib.

The connection position of the rib to the sole can be set based on the specific configuration of the golf club head. For example, the rib may be connected to the sole portion at a position on the heel side. Additionally, the rib may be configured so as not to incline from the toe side to the heel side from the sole portion toward the oval-shaped area.

The specific configuration of the brush portion is not limited to the configuration described in the above-described embodiment. For example, the sole portion does not need to have a groove extending in the toe/heel direction. Additionally, even if the sole portion has a groove, the groove may be formed, for example, at a position away from the back surface of the face portion.

Reinforcement members or buffering members other than the ribs may be formed on the back of the face portion. However, from the viewpoint of simply demonstrating the effect of improving feel, it is preferable that no reinforcing members other than the ribs are disposed on the back of the face portion. Additionally, it is preferable that no buffering member other than the rib is disposed on the rear surface of the face portion.

(Industrial applicability)

As described above, the iron-type golf club head according to one aspect of the present invention is suitable for improving the feeling of hitting.

1 Face part
1a front view
1b back
2 Solbu
2a home
3 top part
4 Toe part
5 heels
6 Hosel part
7 Posterior wall
7a High rigidity part
8, 18 ribs
9 shaft
10, 20 iron type golf club head (golf club head)
11 score line
C1, C11 1st circle
C2 2nd circle
L1, L2, L11, L12 segments
Centroid of the front surface of the G1 face section
The city center of the back of the G11 face part
G1' Projection point that projects the centroid of the front surface of the face onto the back of the face
G2' Projection point where the center of gravity of the golf club head is projected onto the back of the face.
R1, R11 elliptical area
V An imaginary straight line passing through the center of the first circle and the center of the second circle.
X iron type golf club

Claims (10)

An iron-type golf club head having a face portion and a sole extending rearward from the lower edge of the face portion, comprising:
a rib connected to the sole portion and disposed on the back of the face portion;
The rib is formed by forming a first circle with a radius of 10 mm centered on a projection point obtained by projecting the centroid of the back of the face from the sole or the centroid of the front of the face to the back, and placing the center of gravity of the golf club head on the back. It extends into an elliptical area surrounded by a second circle with a radius of 10 mm centered on the projected projection point and two parallel line segments circumscribed by the first circle and the second circle,
An iron-type golf club head wherein the upper end of the rib is located within the oval-shaped area. According to claim 1,
An iron-type golf club head with a lateral moment of inertia of 4000g·㎠ or more. The method of claim 1 or 2,
An iron-type golf club head having a front surface area of the face portion of 36.7 cm2 or more. delete According to claim 1,
An iron-type golf club head, wherein the upper end of the rib is located on an imaginary straight line passing through the center of the first circle and the center of the second circle, or is located above the imaginary straight line. The method of claim 1 or 2,
An iron-type golf club head where the minimum distance between the center of the first circle and the rib is less than or equal to the minimum distance between the center of the second circle and the rib. The method of claim 1 or 2,
An iron-type golf club head wherein the ribs are inclined from the sole toward the oval-shaped area from the toe side to the heel side. The method of claim 1 or 2,
An iron-type golf club head wherein the rib is connected to the sole portion at a position on the toe side. The method of claim 1 or 2,
An iron-type golf club head, wherein the height of the rib within the oval-shaped area is 5 mm or more. The method of claim 1 or 2,
The sole portion has a groove extending in the toe/heel direction,
An iron-type golf club head wherein the rib is connected to the bottom and side of the groove.