JP6556462B2 - Golf club head - Google Patents

Description

  The present invention relates generally to golf club heads, and more particularly to wood type golf club heads having a wavy sole feature.

  Current drivers and fairway wood golf club heads are generally formed of steel or titanium alloys. For example, a large driver head having a volume exceeding 300 cc is usually made of a titanium alloy such as Ti-6Al-4V. However, unless changed, large heads can have a relatively high center of gravity (COG), which can adversely affect launch angle, spin and flight trajectory of the golf ball. Large heads that have not been modified also tend to have a center of gravity that is too far away from the face, which can also adversely affect launch angle, spin and flight trajectory. Thus, many club heads have, for example, slots or weight pads cast into the head to lower the club head's center of gravity and bring it closer to the front of the club head (ie, near the ball striking face).

  Some golf clubs currently on the market include a sole feature located proximal to the face that is intended to improve golf ball launch conditions and lower the center of gravity of the club head (eg, Patent Document 1). These sole features are often slots or grooves with parallel side walls as shown in FIGS. In this example, the body of the club head 10 may include a ball striking face 12, a sole 14, and a slot 16. The slot 16 has a side wall 18 having a height 19 and an upper wall 20 having a width 21. Since the slot 16 adds flexibility to the face 12, the slot 16 can also improve the coefficient of restitution (COR), and as a result, the ball launch characteristics can be improved.

JP 2014-045871 A

  Attempts to improve performance using this configuration may add weight directly to the club head sole 14, or indirectly increase the slot height 19, slot width 21, and / or Increasing the thickness of the wall 20 was included. However, increasing the slot height 19 generally increases the COG of the club head. In addition, it becomes difficult to remove the club head from the mold during the manufacturing process. On the other hand, increasing the width 21 may increase the possibility of undesirable grass interaction (eg, catching) with the club head being played. Increasing the thickness of the top wall 20 or the sole 14 can cause manufacturing defects such as cast pinholes and / or non-uniform wall surfaces. Thus, this configuration can improve COR, but at the expense of control over COG position, it improves COR and adds difficulty and expense to the manufacturing process.

  These slot structures are generally selected for ease of manufacture, but do not result in optimized ball launch conditions. In addition, as described above, attempts to cast thicker walls or deeper slots can cause, for example, casting defects and other manufacturing issues, so the configuration of these slot structures. Is limited. As a result of these constraints, the conventional slot configuration is limited to the extent that the COR can be improved and the COG can be moved.

  Accordingly, there is a need for a golf club head structure that provides improved golf ball launch conditions without causing manufacturing difficulties such as cast pinholes, wavy surfaces and unstable wall thickness. There is also a need for a golf club head structure that provides greater control over COG and COR. The golf club head should also be easily castable using conventional casting techniques. Embodiments of the present invention address these needs and more.

BRIEF SUMMARY An embodiment of the present invention relates to a wood type golf club, and more particularly to a golf club according to the present disclosure comprising a club head having a ball striking face, a crown and a sole. The sole may include a slot for adding additional weight to the club head of the golf club. A slot according to the present disclosure may include a wave feature having one or more wave shapes formed in a slot region of the sole.

  In some examples, a golf club head may include a body that defines an internal cavity and includes a ball striking face and a sole. In some embodiments, a corrugated slot can be located on the sole and can comprise a first sidewall, a second sidewall, and at least one corrugation. The first sidewall may extend substantially in a first generally upward direction and may be located proximal to the ball striking face, and the second sidewall extends substantially in a second generally upward direction. As a result, it can be located on the opposite side of the hitting ball face as seen from the first side wall. In some embodiments, the first and second sidewalls may be arranged at an acute angle relative to each other. In some embodiments, the corrugation can be positioned between the first and second sidewalls and can comprise a trough that does not protrude below the sole.

  Here, the first generally upward direction is a direction away from the ground (a direction away from the sole) when the golf club head is placed on the ground so that the sole contacts the ground. A vertical direction and a direction inclined with respect to the ground. As the first generally upward direction, a direction away from the sole and gradually away from the hitting face (a direction inclined rearward with respect to the sole) may be employed.

  The second generally upward direction is a direction away from the ground (a direction away from the sole) when the golf club head is placed on the ground so that the sole is in contact with the ground. A vertical direction and a direction inclined with respect to the ground. As the second generally upward direction, a direction away from the sole and gradually approaching the ball striking face (a direction inclined toward the front side (ball striking face side) with respect to the sole) may be employed.

  In some embodiments, the corrugated slot may comprise two corrugations of substantially equal height. In some embodiments, the height of the first sidewall may be substantially equal to the height of the second sidewall. In other embodiments, the corrugated slot can comprise a first wave portion having a first height and a second wave portion having a second height, wherein the second height is It is higher than 1 height. In some examples, the first wave portion may be located proximal to the first sidewall and the second wave portion may be located proximal to the second sidewall. In other examples, the second wave portion may be located proximal to the first sidewall and the first wave portion may be located proximal to the second sidewall.

In some embodiments, the height of the first sidewall may be higher than the height of the second sidewall, and in other embodiments, the height of the second sidewall is the height of the first sidewall. It may be higher than that. In other embodiments, the height of the first sidewall is substantially equal to the height of the second sidewall. Some embodiments of the present disclosure may include a damper attached to the corrugated slot of the golf club head so that it does not protrude below the sole. The damper may include, for example, but is not limited to, tungsten, plastic, aluminum, or steel. In some embodiments, the damper may be attached by soldering, welding, gluing, clipping or riveting, for example.

  The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention when understood in conjunction with the accompanying drawings.

  The detailed description explains exemplary embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.

1 is a cross-sectional view of a prior art golf club head having a first sole groove configuration. FIG. FIG. 2 is a bottom perspective view of the prior art golf club head of FIG. 1. 1 is a cross-sectional view of a wood type golf club head according to some embodiments of the present invention. 4 is a bottom view of the wood-type golf club head of FIG. 3 according to some embodiments of the present invention. FIG. 1 is a cross-sectional view of a wood-type golf club head having various wave configuration according to some embodiments of the present invention. 1 is a cross-sectional view of a wood-type golf club head having various wave configuration according to some embodiments of the present invention. 1 is a cross-sectional view of a wood-type golf club head having various wave configuration according to some embodiments of the present invention. 1 is a cross-sectional view of a wood-type golf club head having various wave configuration according to some embodiments of the present invention. 1 is a cross-sectional view of a wood-type golf club head having various wave configuration according to some embodiments of the present invention. 1 is a cross-sectional view of a wood-type golf club head having various wave configuration according to some embodiments of the present invention. 1 is a bottom view of a wood type golf club head including a damper according to some embodiments of the present invention. FIG. FIG. 4 is a bottom view of a variation of the wood-type golf club head of FIG. 3 according to some embodiments of the present invention. It is a bottom view of the golf club head of a comparative example. It is sectional drawing of the golf club head of a comparative example. It is a bottom view of the golf club head of an Example. It is sectional drawing of the golf club head of an Example. It is a side view of the golf club head for demonstrating the evaluated parameter. It is a front view of the golf club head for demonstrating the evaluated parameter.

DETAILED DESCRIPTION Embodiments of the present invention relate generally to golf club heads, and more particularly to golf club heads having corrugations in weight slots on their soles. In some embodiments, the golf club head can add weight to the bottom front region by using weight slots. The weight slot may include, for example, a wave shape to increase the weight of the slot without increasing the thickness of the slot wall. In some embodiments, the weight slot may include more than one wave shape.

  Embodiments of the present invention may comprise a corrugated slot having continuous walls extending alternately upward and downward in a wave or zigzag shape. The wave can start at a high point on the front slot sidewall and end at a high point on the rear slot sidewall. The corrugation may allow the slot thickness to be consistent to accommodate existing manufacturing techniques. Also, this wave shape can increase the mass of the sole of the club head adjacent to the hitting face for the purpose of moving the COG position toward the hitting face.

  For simplicity and clarity of description, the present invention is described herein as a wood type golf club head. However, those skilled in the art will recognize that the invention is not so limited. The materials described below as making up the various elements of the present invention are intended to be illustrative and not limiting. Many suitable materials that will perform the same or similar functions as the materials described herein are intended to be included within the scope of the present invention. Such other materials not described herein may include, but are not limited to, materials developed after the development of the present invention.

  As noted above, a common problem with conventional golf club heads is that the use of weight slots is limited by the ability to increase slot thickness or slot depth. This may be due to conventional manufacturing techniques that limit the usable wall thickness without manufacturing defects, or limit the depth of the weight slot due to casting constraints. This limits the extent to which the COG can be moved forward without adding additional parts or materials.

  3 and 4 illustrate an example club head 110 according to some embodiments of the present disclosure. Club head 110 may include a ball striking face 112, a sole 114, and a wavy slot 116. In some embodiments, the corrugated slot 116 may include a front sidewall 118, a rear sidewall 119, and one or more corrugations 120. The wavy slot 116 may be located on the sole 114 proximal to the ball striking face 112. The position of the corrugated slot 116 can affect the COG and COR of the club head 110, among others.

  For example, by positioning the wavy slot 116 closer to the hitting face 112, the COG can be moved forward (ie, toward the hitting face 112) and downward (ie, toward the sole 114). The position of the COG may be responsible for the spin generation characteristics of the club head 110 (eg, reducing or increasing the spin delivered to the ball). As a result, the COG can be moved forward and downward, so that improved spin characteristics can be provided to the club head.

  By using the wavy slot feature 116, compared to the more rectangular groove used in the prior art, it may be possible to add more weight to the sole 114 of the club head 110 at a given wall thickness. This is because the bottom surface of the rectangular groove is substantially flat, whereas one or more corrugated portions 120 are formed in the corrugated slot 116, so that the volume of the outer shell of the club head 110 constituting the corrugated slot 116. This is because the volume of the outer shell constituting the rectangular groove becomes larger. And since the wall thickness can be practically limited by the manufacturing process, the configuration of the corrugated slot 116 allows for a greater range of club head weight and COG position (eg, lower and further forward) than the prior art. In some embodiments, the number of corrugations 120 may be varied to control the weight of the corrugated slot 116 and thus the weight of the club head 110 and the COG.

  By using the wavy slot 116, the COR characteristic can also be improved. For example, compared to a conventional club head, the club head 110 can have improved COR over a larger surface of the ball striking face 112. The wavy slot 116 can provide a region of reduced stiffness on the ball striking face 112, and the trampoline effect can be increased because the wavy slot 116 “acts like an accordion” upon impact. In this way, a greater force can be transmitted to the ball over a larger area of the face, improving hit consistency. As a result of improving the COR over a large area of the ball striking face 112, the “sweet spot” is increased and, as a result, the performance of the club head can be improved and is necessary to generate (reproduce) the desired ball flight. User skill and accuracy can be reduced.

  The change in COR can be controlled, for example, by changing the number and size of the corrugated slots 116, such as the height of the corrugated portion 120 closest to the ball striking face. It is not limited. Each wave 120 can have a valley 121 or a low point and a peak 122. In some embodiments, the height of the first corrugation (i.e., from valley 121 to peak 122) is, for example, 2.0 mm or more to provide the desired COR enhancement and a larger sweet spot. Also good. The height of each sidewall 118, 119 can also be selected to provide the desired COR enhancement and COG position. For example, by setting the height of the wave portion (distance in the vertical direction from the valley 121 to the peak 122) to be 2.0 mm or more, the restitution coefficient at the position below the center (the ground side) of the hitting ball face 112 is Compared with the case where there is no wavy slot 116, it can be effectively increased.

  As shown in FIG. 4, the wavy slot 116 may be disposed on the front side (hitting ball 112 side) from the center of the head width 130 of the club head 110. Further, the length 132 in the toe-heel direction of the front side portion 116a that is the portion closest to the hitting face 112 in the wavy slot 116 and extends along the hitting face 112 may be 10 mm or more, or 20 mm or more. Also good. Further, the front side portion 116 a may be disposed so as to intersect the sole center line 131 of the club head 110. Further, the front side portion 116a may be arranged so that the sole center line 131 passes through the center in the toe-heel direction of the front side portion 116a.

  5A-5F show alternative wave shapes for the club head. Each unique shape may have different COG and COR characteristics and different total weight. The pattern shown can be selected to provide the club head with the desired properties for a particular user or application. FIGS. 5A-5F are only shown to illustrate examples of how dimensions and corrugation sizes can be changed, and are intended to limit the embodiments of the present disclosure. is not.

  Some embodiments according to the present disclosure may include a club head 210, a ball striking face 212, a sole 214, and a wavy slot 216. The corrugated slot 216 can include a front side wall 218, a rear side wall 219, a first wave portion 222, and a second wave portion 223. Each wave portion 222, 223 may have a valley 221 at a low point of each wave portion and a peak 229 at a high point of each wave portion. The sidewalls 218, 219 and the corrugations 222, 223 of the corrugated slot 216 can each have a height 225, 226, 227, 228 associated with them. In some embodiments, for example, the height 225 of the front sidewall 218 may be substantially equal to the height 226 of the rear sidewall 219. Similarly, in some embodiments, the height 227 of the first wave portion 222 may be substantially equal to the height 228 of the second wave portion 223.

  In some embodiments, the corrugated slot 216 has a relatively small height, for example, compared to other configurations (eg, corrugated slots 316, 416, 516, 616, and 716) and is therefore lightweight. 222, 223 may be provided. FIG. 5B shows a club head 310 having a ball striking face 312, a sole 314, and a wavy slot 316. In this configuration, the height of the first wave portion 322 may be substantially equal to the height of the first wave portion 222, but the height of the second wave portion 323 is equal to the second wave portion. It may be higher than the height of 223. Like the wavy slot 216 in FIG. 5A, the wavy slot 316 may have a front side wall 318 whose height is substantially equal to the rear side wall 319. Such a configuration can provide, for example, similar COR performance between the club heads 210 and 310, but the COG of the club head 310 is closer to the ball striking face 112.

  In some embodiments, as shown in FIGS. 5A-5D, the front and rear sidewalls may be substantially equal in height. In other embodiments, as shown in FIGS. 5E-5F, the front and rear sidewalls may have different heights. By varying the side wall height, the weight of the wavy slot can be located near the club head hitting face or away from the club head hitting face. Embodiments of the present disclosure may include a wave slot configuration having one, two, three or more wave portions. Also, embodiments according to the present disclosure may include a corrugated slot configuration having sidewall height and corrugation height that varies according to the desired weight, COR value, and COG position for a particular application.

  In general, embodiments of the present disclosure having higher front sidewalls and front corrugations are more ball hit than club heads designed to have shorter front sidewalls and higher second or third corrugations. It may be closer to the face and have a higher COG position from the sole. If the club head has a COG closer to the hitting face, there may be a tendency to deliver less spin to the ball than a club head having a COG further away from the hitting face. Furthermore, the COG height of the club head can change the position and size of the “sweet spot”, which is the position on the ball striking face with the highest COR. These features can be adjusted, for example, to a golfer who desires greater or lesser spin.

  In some embodiments, the height of the shorter corrugation can be approximately 1.0-2.0 mm. The height of the higher wave portion may be approximately 2.0-4.0 mm. The height of the shorter wave part of the wave part closest to the hitting face cannot, for example, substantially increase the COR of the lower part of the hitting face. May have an effect. In some embodiments, design considerations such as the desired club head weight and COG position may suggest a particular corrugation size and configuration.

  In some embodiments, as shown in FIG. 6, the club head 810 may, for example, control club head strike noise to minimize unwanted turf interactions (eg, snags and digs). A damper 24 may be provided for purposes but not limited thereto. If no changes are made, depending on the configuration and materials, the club head 810 may produce an undesirable sound when the ball is hit. Further, the club head 810 may interact with the lawn on which the golf ball is placed. Undesirable lawn interactions such as catching, catching and barking can result in swing slips, mishits and even injuries. For this purpose, a damper 24 can be used to reduce the magnitude of these undesirable effects. The damper 24 may be sized so that it attaches to the wavy slot and does not protrude below the sole of the club head 810.

  In some embodiments, the damper 24 may include a particularly high density heavy material, such as tungsten, to further reduce the COG of the club head. In other embodiments, the damper 24 can include, but is not limited to, plastic, aluminum, or steel, for example. The damper 24 can be soldered, welded, glued, clipped, or riveted, for example, but not limited to, the sole 114.

  As shown in FIG. 7, in the club head 910, for example, the wavy slot 916 formed in the sole 914 may include a plurality of bent portions 916b, 916c, 916f, and 916g in plan view. Further, the wavy slot 916 further includes a front side portion 916a, a first side portion 916d, 916e, and a second side portion 916h, 916i connected via the plurality of bent portions 916b, 916c, 916f, 916g. You may go out. Specifically, the front side portion 916a is positioned on the hitting ball face 912 side in plan view and extends along the hitting ball face 912. First side portions 916d and 916e extending in a direction intersecting with the extending direction of the front side portion 916a are connected to the front side portion 916a via bent portions 916b and 916c located at both ends of the front side portion 916a. Yes. Second side portions 916h and 916i are connected to the first side portions 916d and 916e via bent portions 916f and 916g located at the end opposite to the end connected to the front side portion 916a. Yes. Each of the second side portions 916h and 916i extends in a direction different from the extending direction of the first side portions 916d and 916e.

  From a different point of view, the planar shape of the wavy slot 916 may have a shape bent along the outer periphery of the club head 910. The end portions 916j and 916k of the wavy slot 916 may be located rearward of the center portion of the club head 910 in the front-rear direction of the club head 910 (the left-right direction in FIG. 7).

  In addition, although two wave portions are formed in the wave slot in the club head described above, the number of the wave portions may be three or more. For example, the number of wave portions may be three, four, or five or more.

Example 1
For the club head of the example and the club head of the comparative example, the center of gravity position and the coefficient of restitution were examined by simulation.

<Sample>
As a comparative club head, a club head configured as shown in FIGS. 8 and 9 was considered. In addition, as the club head of the example, a club head having a configuration as shown in FIGS. As can be seen from FIGS. 8 to 11, the basic shape of the club head of the comparative example and the club head of the example are the same, but the wavy slot 16 (see FIGS. On the other hand, in the club head of the comparative example, the region 11 corresponding to the location where the wave-like slot of the club head of the above embodiment is formed is a substantially flat sole surface. Further, since the center of gravity is almost aligned between the comparative example and the example, the weight 512 is disposed in the region 11 in the club head of the comparative example, as can be seen from FIG.

  Regarding the club head of the comparative example and the club head of the example, the configuration of the portions other than the region where the wavy slot 16 is formed or the region where the weight 512 is arranged is basically the same.

<Calculation method>
Using the simulation software (Creo / Mechanica: PTC Inc.), the center of gravity (COG) position, the sweet spot (SS) position, and the center point (first measurement point) of the club heads of the comparative example and the example ) And the coefficient of restitution at the second measurement point, which is a position descending from the center of the hit ball face to the ground side and having a distance of 12 mm from the ground.

  As shown in FIG. 12, for the position of the center of gravity 13, the height a from the ground 518 to the center of gravity 13 and the distance c from the sweet spot (SS14) to the center of gravity 13 were used as evaluation parameters. For the sweet spot (SS14), the height b from the ground 518 to SS14 was used as an evaluation parameter.

  Further, as shown in FIG. 13, the center point (first measurement point 15) of the hit ball face is assumed to be a quadrangle that touches the outer periphery of the hit ball face in the plane including the hit ball face, and is set as the center point of the square. Further, the second measurement point 17 is a position where the distance from the ground 518 is 12 mm on a line segment passing through the first measurement point 15 and perpendicular to the ground 518 in the plane including the hitting ball face. The second measurement point 17 was determined on the assumption that the golfer actually hits the ball.

<Result>
In the example club head, the height a of the center of gravity 13 from the ground 518 was 15.7 mm, the distance c from SS14 to the center of gravity 13 was 23.7 mm, and the height b from the ground 518 to SS14 was 26.3 mm. . Further, the coefficient of restitution (COR) at the first measurement point 15 of the club head of the example was 0.798.

  In the club head of the comparative example, the height a of the center of gravity 13 from the ground 518 is 15.5 mm, the distance c from the SS 14 to the center of gravity 13 is 23.4 mm, and the height b from the ground 518 to SS 14 is 26.8 mm. there were. Further, the coefficient of restitution (COR) at the first measurement point 15 of the club head of the comparative example was 0.799. Thus, the above-described height a, height b, distance c, and coefficient of restitution at the first measurement point 15 are substantially the same in the example and the comparative example. In particular, the restitution coefficient at the first measurement point 15 is as small as 0.001 between the example and the comparative example.

  On the other hand, the restitution coefficient at the second measurement point 17 in the example was 0.780, and the restitution coefficient at the second measurement point 17 in the comparative example was 0.770. Regarding the coefficient of restitution at the second measurement point 17, the difference between the example and the comparative example is 0.010. That is, at the second measurement point 17, the difference between the example of the coefficient of restitution and the comparative example is 10 times the difference at the first measurement point 15.

  This is because the coefficient of restitution at the second measurement point 17 is larger than the coefficient of restitution of the comparative example because the wavy slot 16 is formed in the club head of the example. Thus, in the club head of the example, the area having a sufficient coefficient of restitution can be widened on the hitting face while the position of the center of gravity 13 is the same as in the comparative example.

(Example 2)
<Sample>
In the configuration of the club head of the first embodiment of the first embodiment, the height d of the wave portion near the hitting face of the wavy slot 16 shown in FIG. 11 is 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm. The configuration (Sample 1 to Sample 5) was changed to 5 mm. Here, as the height d of the wave portion, a height indicating a small value among the heights in the vertical direction from the valley located at the central portion of the wave portion to the peaks at both ends of the wave portion was used.

<Calculation method>
Using the same simulation software as in Example 1, the coefficient of restitution at the first measurement point 15 and the second measurement point 17 was calculated for each club head described above.

<Result>
The restitution coefficient at the first measurement point 15 is 0.799 when the height d is 1.0 mm to 2.0 mm (sample 1 to sample 3), and the height d is 2.5 mm and 3.5 mm (samples 4 and 5). ) Was 0.800. On the other hand, the coefficient of restitution at the second measurement point 17 is 0.771 when the height d is 1.0 mm (sample 1), 0.773 when the height d is 1.5 mm (sample 2), and the height d is It was 0.780 in the case of 2.0 mm (sample 3), 0.780 in the case of height d of 2.5 mm (sample 4), and 0.781 in the case of height d of 3.5 mm (sample 5).

  Thus, when the height d is 2.0 mm or more, the coefficient of restitution at the second measurement point 17 can be increased to some extent.

  Here, the height d is the height from the valley to the peak in the wave part near the hitting ball face, but the height to each of the peaks located on both sides of the valley in the wave part is different (for example, FIG. In the case of the configuration shown in FIG. 5F), the height d may be the smaller of the heights from the valley to the two peaks.

  The embodiments and examples disclosed herein are illustrative in all respects and should not be construed as being restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  11 area, 13 center of gravity, 14 sweet spot, 15 first measurement point, 17 second measurement point, 110, 210, 310, 410, 510, 610, 710, 810, 910 golf club head, 112, 212, 312, 912 Hitting ball face, 114, 214, 314, 914 sole, 16, 116, 216, 316, 416, 516, 616, 716, 916 wavy slot, 118, 218, 318 side wall, 119, 219, 319 side wall, 120, 222, 223, 322, 323 Wave, 121, 221 Valley, 116a, 916a Front side, 916b, 916c, 916f, 916g Bending part, 916d, 916e First side part, 916h, 916i Second side part, 916j, 916k end, 130 head width, 131 sole center line, 132 length, 512 weights, 518 ground.

Claims (9)

A golf club head,
A body defining an internal cavity and including a ball striking face and a sole;
A wavy slot located on the sole and comprising a first side wall, a second side wall, and at least two corrugations;
The first sidewall extends substantially in a first generally upward direction and is located proximal to the ball striking face, and the second sidewall is substantially in a second generally upward direction. Extending and located on the opposite side of the hitting face as viewed from the first side wall,
Each corrugation is positioned between the first and second sidewalls , each having a trough at a low point of each corrugation ,
The corrugated slot includes a first wave portion having a first height and a second wave portion having a second height, and the second height is higher than the first height. high,
The first height and the second height are lower than the height of the first side wall and the height of the second side wall;
The golf club head , wherein the second wave portion is located proximal to the first sidewall and the first wave portion is located proximal to the second sidewall . The golf club head of claim 1, wherein a height of the first side wall is substantially equal to a height of the second side wall. The golf club head according to claim 1, wherein a height of the first side wall is higher than a height of the second side wall. The golf club head according to claim 1, wherein a height of the second side wall is higher than a height of the first side wall. The golf club head according to claim 1, further comprising a damper attached to the wavy slot of the golf club head so as not to protrude below the sole. The golf club head of claim 5, wherein the damper comprises one or more of tungsten, plastic, aluminum, and steel. The golf club head of claim 6, wherein the damper is attached by one or more of soldering, welding, gluing, clipping and riveting. The golf club head of claim 1, wherein the corrugated slot comprises at least three corrugations. The wavy slot comprises a front side extending along the hitting face,
2. The golf club head having a head width in a direction of a sole center line intersecting the front side portion, wherein the front side portion is disposed closer to the hitting ball face than a center of the head width. Golf club head.