JP2013000500A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate ball hitting sound whose specific frequency is adjusted while reducing the weight of a rib.SOLUTION: In this golf club head, the rib 200 has a cylindrical hole 210 having a diameter of r and a height of h. The hole 210 extends in a direction H along a ball hitting surface 110S, and is opened to an internal space 101 in opening parts 211, 212 located at both ends in the direction H in the internal space of the head. When a golf ball collides with a face part 110, the face part 110 vibrates by a force received from the golf ball, and the vibration is transmitted to vibrate the rib 200. The hole 210 vibrates together with the rib 200, and vibrates air in a resonance space 300. The vibrated air is resonant with a frequency represented by a function of a sound velocity c and a height h as a resonance frequency of a primary mode.

Description

  The present invention relates to a hollow golf club head provided with ribs on the inside.

  Conventionally, a rib has been provided inside a hollow golf club head. In Patent Document 1, while adjusting the rigidity by providing a rib inside the golf club head, providing a desired natural vibration mode, and improving the rigidity while achieving thinning of the golf club head, It describes that the hitting sound is increased. Patent Document 2 describes that a rib having a shape that can relieve stress concentration due to impact is provided inside a hollow golf club head.

JP 2005-143589 A Japanese Utility Model Publication No. 6-23553

When a rib is provided on the inner side of the golf club head, the moment of inertia of the cross section increases and the rigidity is reinforced, while the center of gravity of the golf club head is closer to the side where the rib is provided by the weight of the rib. Become. Therefore, if another portion is made heavy in order to adjust the center of gravity of the golf club head, it may be difficult to keep the weight of the golf club head within an allowable weight for the player to swing without difficulty. For this reason, in order to increase the degree of freedom in designing the center of gravity of the golf club head, it is desired to secure the secondary moment of section required for the design with a lighter rib. In addition, it is desired that the golf club head generate a hitting sound that a player likes when a golf ball is hit.
The present invention has been made in view of such circumstances, and one of its purposes is to generate a hitting sound in which the volume of sound of a specific frequency is adjusted while reducing the weight of the rib.

  In order to solve the above-mentioned problems, the present invention is provided with a head body in which a space is formed by a face portion, a crown portion, and a sole portion, and a golf ball collides and vibrates at the time of hitting, and an inner surface of the head body. The golf club head includes a rib, and the rib has a hole opened in the space, and the hole resonates sound at a specific frequency.

In a preferred aspect, the rib may be provided on the face portion on which a golf ball collides upon hitting.
In another preferred aspect, the hole extends in a direction along a ball striking surface on which the golf ball collides at the time of hitting the face portion, and opens into the space at one end of the direction, and the end of the face portion The part side may be bent to the side where the rib is provided, and may have a shape that is notched so as not to intersect with the region where the hole extends from the one end in the direction.
In another preferred embodiment, the hole may resonate at a frequency corresponding to the natural frequency of the head body.
In another preferred embodiment, a resistance material that provides resistance of the vibrating air may be provided inside the hole.

  According to the present invention, it is possible to generate a hitting sound in which the volume of sound of a specific frequency is adjusted while reducing the weight of the rib as compared with the case where a rib having no opening is provided inside the main body. be able to.

It is a figure which shows the external appearance of the golf club which concerns on embodiment. It is a figure which shows the head seen from the face part side. It is a figure which shows the cross section of the joined face part, crown part, and sole part. It is a figure which shows the cross section of the face part, crown part, and sole part before joining. It is a figure which expands and shows the cross section of a face part. It is a figure which shows the area | region where the sound pressure increased by the hit ball in the resonance space. It is a figure which shows the edge part seen from the crown part side. It is a figure which shows the face part seen from the internal space side. It is a figure for demonstrating the change of the pitch of the hitting sound by the presence or absence of a hole. It is a figure which shows the cross section of the face part which concerns on a modification. It is a figure which shows the crown part which concerns on a modification. It is a figure which shows the face part which concerns on a modification. It is a figure which shows the rib which concerns on a modification. It is a figure which shows the rib which concerns on a modification. It is a figure which shows the rib which concerns on a modification.

[Embodiment]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating an appearance of a golf club 1 according to the embodiment. The golf club 1 has a head 10, a shaft 20, and a grip 30. A head 10 is attached to one end of the shaft 20, and a grip 30 is attached to the other end. The head 10 includes a face portion 110 that is a portion where a golf ball collides when a ball is hit. When the golf club 1 is shaken (swinged) by the player who grips (grips) the grip 30 and the face portion 110 collides with the golf ball, the kinetic energy of the golf club 1 centering on the head 10 is transmitted through the face portion 110. Is transmitted to the golf ball, and the golf ball flies. Next, the structure of the head 10 will be described with reference to FIGS.

  FIG. 2 is a view of the head 10 as viewed from the face portion 110 side. In FIG. 2, the head 10 is shown to be oriented when the player grips (addresses) the golf club 1. The head 10 includes the face portion 110, the crown portion 120, and the sole portion 130 described above. The face part 110 has a sole part 130 joined to the ground side at the time of addressing and a crown part 120 joined to the empty side. The crown portion 120 is provided with a hosel 201 for inserting and fixing the shaft 20.

  3 and 4 are cross-sectional views of the face portion 110, the crown portion 120, and the sole portion 130 taken along a cutting line III-III passing through the center in the horizontal direction of the face portion 110 in FIG. FIG. 3 shows a state in which the face part 110, the crown part 120, and the sole part 130 are joined to each other. These parts are joined to each other at their end faces to form a head body 100 of the head 10. The head main body 100 has a hollow space inside, and hereinafter this space is referred to as an internal space 101. That is, the head main body 100 includes a face portion 110, a crown portion 120, and a sole portion 130, and an internal space 101 is formed inside by the face portion 110, the crown portion 120, and the sole portion 130. The internal space 101 corresponds to an example of a “space” according to the present invention. FIG. 4 shows a state before the face part 110, the crown part 120, and the sole part 130 are joined to each other. Each of these parts is formed in a plate shape by a forging method using titanium as a material. When these parts are joined to each other and brought into the state shown in FIG. 3, the inner surfaces 110R, 120R, and 130R, which are the surfaces on the inner space 101 side, cannot be processed, so the state before joining shown in FIG. To process each inner surface. Specific examples of processing will be described later.

  As described above, the head 10 is a portion where the golf ball collides when hit. At this time, a force corresponding to a reaction of kinetic energy acting on the golf ball is applied to the head 10 from the golf ball. For this reason, it is calculated | required to have the intensity | strength and durability which do not break even if this force is added. This is particularly required in the face portion 110 of the head body 100, which is a portion where the golf ball collides when hitting. The object of the face 110 is to provide the above-mentioned strength and durability on the back side of the ball striking surface 110S, which is the surface that the golf ball collides with when hitting, that is, the inner surface 110R that is the inner space 101 side (inner side) surface. As one, the rib 200 is provided. Next, the structure of the face part 110 and the rib 200 will be described with reference to FIGS.

  FIG. 5 is an enlarged view showing a cross section of the face portion 110 of FIG. The rib 200 has a hole 210 inside. The hole 210 extends in the direction H along the ball striking face 110 </ b> S, and opens into the internal space 101 at openings 211 and 212 at both ends of the direction H. The hole 210 has a cylindrical shape with a diameter r and a height h. That is, the hole 210 extends from the opening 211 to the opening 212 by a length h in the direction H. A cylindrical resonance space 300 is formed inside the hole 210. The resonance space 300 is a part of the internal space 101 and is connected to the outside through the openings 211 and 212. The term “external” as used herein refers to a space in the internal space 101 excluding the resonance space 300. The resonance space 300 is filled with air present in the hole 210. This air forms a cylindrical air column by the hole 210 and resonates due to vibration generated in the hole 210 when the ball is hit. More specifically, when the golf ball collides with the face part 110, the face part 110 vibrates due to the force received from the golf ball, and this vibration is transmitted to vibrate the rib 200. At this time, the hole 210 vibrates with the rib 200 and vibrates the air column filling the resonance space 300. The air column vibrated through the hole 210 resonates with the frequency f1 shown in the equation (1) as the resonance frequency of the primary mode when the sound speed is c.

このように、穴２１０は、共鳴空間３００を満たしている気柱を振動させることで、周波数ｆ１の倍数で音を共鳴させる。以下では、この音を「共鳴音」という。気温が一定の状況であれば、式（１）で示されるとおり、共振周波数、すなわち共鳴音の音高は、穴２１０の高さｈに比例する。本実施形態においては、ｈは５０ｍｍである。例えば音速が３４５ｍ／ｓｅｃとなる状況であれば、周波数ｆ１は約３４５０Ｈｚとなる。

As described above, the hole 210 causes the air column filling the resonance space 300 to vibrate, thereby resonating the sound with a multiple of the frequency f1. Hereinafter, this sound is referred to as “resonance sound”. If the temperature is constant, the resonance frequency, that is, the pitch of the resonance, is proportional to the height h of the hole 210 as shown in the equation (1). In the present embodiment, h is 50 mm. For example, in a situation where the sound speed is 345 m / sec, the frequency f1 is about 3450 Hz.

  FIG. 6 is a diagram showing a region where the sound pressure of a specific frequency is high, measured when the golf ball collides with the center portion C1 of the hitting surface 110S of the face portion 110w provided with the rib 200w having the hole 210w. It is. The hole 210w forms a resonance space 300w. FIG. 6A shows a region D1 in which a high sound pressure having a frequency of 3680 Hz in the resonance space 300w is painted in a lattice shape, and FIG. 6B shows a frequency of 7670 Hz in the resonance space 300w. A portion where the sound pressure is high is indicated by a region D2 filled in a lattice shape. As shown in these figures, when the golf ball collides with the face portion 110w, the air filling the resonance space 300w in the hole 210w resonates with the frequency of the primary mode around 3680Hz, and 7670Hz that is twice that. The state of resonance with the frequency of the secondary mode in the vicinity was measured. In this way, the generation of the overtone component adds depth to the hitting sound felt by the player.

  Returning to FIG. Since the rib 200 is provided in the face part 110, for example, the center part C1 and the hole 210 are closer to each other than when provided in the crown part 120 or the sole part 130. For this reason, compared with these cases, the force applied from the golf ball is efficiently used as the force for vibrating the air in the hole 210. Further, as shown in FIG. 6, not only the sound of the frequency of the primary mode but also the sound of the frequency of the secondary mode that is a harmonic thereof is generated, so that the sound can be deepened.

  The face part 110 is formed by a forging method as described above. At that time, the face portion 110 is formed in a shape provided with a rib 200 having no hole 210. The rib 200 has a rod-like shape, and is provided on the face portion 110 with its length direction directed to the vertical direction at the time of addressing. This length direction is the same as the direction H. The hole 210 is formed by cutting the rib 200 after the face portion 110 and the rib 200 are formed. Further, as shown in FIG. 5, the face portion 110 has a shape in which an end portion side is bent to a side where the rib 200 is provided. In FIG. 5, a portion of the face portion 110 on the bent end side is shown as an edge portion 111. The edge 111 has a shape that makes it easy to cut the rib 200.

FIG. 7 is a view showing the edge portion 111 viewed from the crown portion 120 side. The edge 111 has a shape that is notched so as not to intersect with a region J in which the hole 210 is extended from the opening 211 in the direction H shown in FIG. The opening 211 corresponds to an example of “one end” according to the present invention. In FIG. 7, the cutout portion is indicated by a cutout portion 112. As shown in FIG. 7, when the rib 200 is viewed from the crown portion 120 side, the hole 210 can be seen through the cutout portion 112 without being obstructed by the edge portion 111.
FIG. 8 is a diagram showing the face portion 110 as viewed from the internal space 101 side. As shown in FIG. 8, the notch 112 is provided at a position where a region where the hole 210 extends from the opening 211 in the direction H extends. With the above configuration, when cutting the rib 200, the cutting drill can be applied to the rib 200 along the direction H without being interrupted by the edge 111 by passing through the notch 112. For this reason, it is possible to easily cut the rib 200.

  Since the rib 200 has the cylindrical hole 210, the rib has the same dimension in the direction H and does not have the hole 210 (hereinafter referred to as a holeless rib) and has the same mass. The cross-sectional secondary moment is larger than that of the none rib. In other words, the rib 200 has a smaller mass than a holeless rib having the same cross-sectional second moment. Further, the golf club head vibrates at a natural frequency when a ball is hit. If the natural frequency is f2, the head mass is m, and the stiffness term representing the stiffness of the head is K, f2 is expressed by the following equation (2).

ヘッドの固有振動数を特定の振動数（例えば得たい固有振動数）とする場合、式（２）に表されるように、リブ２００を設けたヘッド１０では、リブ２００と質量が同じ穴なしリブを設けたヘッドに比べて剛性項Ｋが大きくなるので、質量ｍを減らすことができる。また、この減らした質量の分の部材をヘッド１０に配置することで、穴なしリブが設けられたヘッドと同じ質量でも、重心の位置を異ならせることができる。つまり、ヘッド１０では、いわゆる重量配分の設計の自由度を向上させることができる。

When the natural frequency of the head is set to a specific frequency (for example, the natural frequency to be obtained), the head 10 provided with the rib 200 does not have a hole having the same mass as the rib 200, as represented by the equation (2). Since the rigidity term K is larger than that of a head provided with ribs, the mass m can be reduced. Further, by disposing the member corresponding to the reduced mass in the head 10, the position of the center of gravity can be made different even with the same mass as the head provided with the holeless rib. That is, the head 10 can improve the degree of freedom in designing so-called weight distribution.

Further, when the mass of the rib to be provided is the same, the head provided with the rib having the hole is expressed by the formula (2) as compared with the head provided with the rib without hole having the same dimension in the direction H as the rib. As shown, the natural frequency increases.
FIG. 9 is a diagram for explaining a change in pitch of a hitting sound depending on the presence or absence of a hole. FIG. 9A shows a face portion 110x provided with a rib 200x not having a hole, and FIG. 9B shows a face portion provided with a rib 200y having a hole 210y. 110y is shown. The face portions 110x and 110y are formed to have the same mass. The rib 200x has a height of 5 mm from the inner surface 110Rx on the inner space 101 side of the face portion 110x. When the sound generated when the golf ball collides with the central portion Cx of the hitting surface 110Sx of the face portion 110x was measured with a microphone installed at a position 50 mm away from the face portion 110x, the peak of the lowest frequency was around 6800 Hz. Measured in

  In contrast, the face portion 110y is provided with a face portion 110y provided with a rib 200y having a height of 8 mm from the inner surface 110Ry on the inner space 101 side of the face portion 110y and having a hole 210y having a diameter of 6 mm. The golf ball was made to collide with the central portion Cy of the hitting surface 110Sy and the same measurement was performed. As a result, the frequency of the primary mode was about 7000 Hz. That is, in the face portion 110y provided with the rib 200y, the pitch of the hitting sound can be increased by 200 Hz compared to the face portion 110x provided with the rib 200x.

  As described above, the rib 200 can be reduced in weight as compared with a holeless rib formed to have the same cross-sectional second moment, and compared to a holeless rib formed to have the same mass. And the moment of inertia of the cross section can be increased. In addition, since the head 10 is provided with the rib 200, the weight of the head can be reduced or the degree of freedom in designing the weight distribution can be improved as compared with the head provided with the rib without holes. Further, the head 10 can generate a hitting sound in which a sound having a specific frequency is adjusted as compared with a hitting sound generated by a head provided with a holeless rib.

[Modification]
The above-described embodiment is merely an example of implementation of the present invention, and various applications and modifications are possible as follows, and can be combined as necessary.

(Modification 1)
In the embodiment described above, the rib 200 has the hole 210 that opens into the internal space 101 through the two openings 211 and 212. However, the hole that the rib has opens into the internal space 101 through one opening. It may be a thing and it may open to the internal space 101 by three or more openings. In short, the hole which a rib has should just be a thing which a part opens to the internal space 101. FIG.
FIG. 10 is a view showing a cross section of the face portion according to this modification. FIG. 10A shows a rib 200a having a hole 210a that opens into the internal space 101 at one opening 211a. The hole 210a is a cylindrical hole, and the length in the direction H of the cylinder, that is, the depth from the opening 211a is ha. In this case, when the face portion 110a provided with the rib 200a vibrates by the hit ball, the air present in the hole 210a resonates with the frequency f1a expressed by the equation (3) as the resonance frequency of the primary mode.

例えば、ｈａを２０ｍｍとしてフェース部１１０ａを形成した場合、音速が３４５ｍ／ｓｅｃとなる状況であれば、周波数ｆ１ａは約４３１０Ｈｚとなる。このように、リブが有している穴が片側が開口している（開口部が１つである）場合、両側が開口している（開口部が２つである）場合に比べて、方向Ｈの長さがより短い穴で、その穴内の空気を同じ一次モードの共振周波数で共鳴させることができる。言い換えれば、穴の方向Ｈの長さが同じであれば、両側が開口している穴を有するリブよりも、片側が開口している穴を有するリブの方が、音高が高い音を出すことができる。

For example, when the face portion 110a is formed with ha of 20 mm, the frequency f1a is about 4310 Hz in a situation where the sound speed is 345 m / sec. In this way, the direction of the holes of the ribs when one side is open (one opening) is larger than when both sides are open (two openings). A hole with a shorter length of H allows the air in the hole to resonate at the same primary mode resonance frequency. In other words, if the length in the direction H of the hole is the same, the rib having the hole opened on one side emits a higher sound than the rib having the hole opened on both sides. be able to.

  FIG. 10B shows a rib 200b having a hole 210b that opens into the internal space 101 at three openings 211b, 212b, and 213b. In this case, when the face portion 110b provided with the rib 200b vibrates by the hit ball, the air present in the hole 210b vibrates with the opening 213b as a belly or a node, and a resonance sound is generated. In the hole 210b, if the third opening is provided on the opening 211b side or the opening 212b side instead of the opening 213b, the pitch of the resonance can be changed.

(Modification 2)
In the embodiment described above, the rib 200 is provided on the face portion 110 of the head main body 100. However, the location where the rib having a hole is provided is not limited to the face portion. It may be. Further, the number of ribs to be provided is not limited to one and may be plural. In short, the rib only needs to have a hole for resonating sound at a specific frequency.
FIG. 11 is a diagram showing a crown portion 120c according to this modification. Two ribs 200c each having a hole 210c are provided on the inner surface 210Rc on the inner space 101 side of the crown portion 120c. When the face portion 110 is vibrated by the hit ball, the vibration is transmitted to the ribs 200c via the portion where the face portion 110 and the crown portion 120c are joined and the crown portion 120c. The rib 200c vibrates and the air in the hole 210c vibrates and resonates. In short, when the golf ball collides with the face portion 110 at the time of hitting the ball, the entire head main body 100 vibrates, so the rib 200 may be provided anywhere on the inner surface of the head main body 100.
In the case of the rib 200c according to this modification, the sound generated in the hole 210c is emitted in the direction in which the player's head is located through the crown portion 120c. As a result, in the rib 200c, a larger resonance sound can be transmitted to the player if the magnitude of the resonance sound is the same as that of the rib provided on the face part 110 or the sole part 130.

(Modification 3)
In the above-described embodiment, the vibration of the air generated in the hole 210 has been described as being used for generating a resonance sound. However, the vibration of the air generated in the internal space 101 may be canceled out. In this case, the rib 200 provided on the face part 110 can reduce the sound generated in the head 10. Further, the sound generated from the head 10 may be made inconspicuous by masking the sound generated by the vibration of the air in the internal space 101 with the resonance sound generated in the hole 210.

(Modification 4)
In the embodiment described above, the ribs 200 of the face part 110 formed by the forging method are cut to form the holes 210. However, the present invention is not limited to this, and the face part 110 may be formed by a casting method, or there is no rib. A face portion may be formed, and a rib having a hole may be welded to the face portion.
FIG. 12 is a diagram showing a face portion 110d according to this modification. The inner surface 110Rd on the inner space 101 side of the face portion 110d has a hole 210d, and a rib 200d having the hole 210d is welded by the hole 210d. Further, the edge portion 111d of the face portion 110d does not have a shape that is partly cut out like the cutout portion 112 in the face portion 110. In the face portion 110d, the rib 200d is cut to form the hole 210d and then welded to the inner surface 110Rd. Therefore, the edge portion 111d is designed without considering the space for passing the drill in the rib cutting process. be able to. In this case, the rib 200d may be formed of a titanium alloy that is less susceptible to vibration damping than titanium, which is the material of the face portion 110. Thereby, the reverberation effect of the resonance can be improved as compared with the case where titanium is used as the material of the rib 200d.

(Modification 5)
In the embodiment described above, since the hole 210 is formed by cutting the rib 200 with a drill, the hole 210 has a shape that is linearly connected from the opening 211 (or 212) to the inside. For example, it may be a cylindrical hole, and may be a hole having a shape in which a space branched in the middle of the height direction of the cylinder opens into the internal space 101.
FIG. 13 is a view showing a rib 200e according to this modification. In FIG. 13, the rib 200e seen from the internal space 101 side is shown. The rib 200e has a cylindrical hole 210e having one opening 211e. In the hole 210e, both ends in the height direction of the cylinder are not opened in the internal space 101, and a space formed by branching in the middle of the cylindrical curved surface is connected to the opening 211e opened in the internal space 101. .

(Modification 6)
In the above-described embodiment, the face portion 110 is provided with the rod-shaped rib 200 in the vertical direction at the time of addressing. However, the rib 200 may be provided in the horizontal direction. May be provided with ribs of different shapes. In the above-described embodiment, the rib 200 has one hole 210 by one hole 210, but the number and shape of the holes that one rib has are not limited to this.
FIG. 14 is a view showing a rib according to this modification. In FIG. 14, the ribs viewed from the internal space 101 side are shown, and all of the ribs have an “X” shape. FIG. 14A shows ribs 200f each having four holes 210f opened on one side in four bar-shaped portions having an "X" shape. FIG. 14B shows a rib 200g having a hole 210g in which the holes 210f of FIG. In short, the rib provided on the inner side of the head main body 100 is provided in a shape corresponding to each purpose such as improving the durability of the face portion (which may be a crown portion or a sole portion) or widening the sweet spot. That's fine. Further, any number of holes may be formed in any shape as long as they resonate at a desired resonance frequency. As a result, the hitting sound, which is the sound generated from the head at the time of hitting, is set as a sound to which a resonance sound having a desired pitch (frequency) is added, and by adding the sound of the primary mode and its overtone, the depth of the sound is obtained, Or the sound of the pitch (frequency) to be reduced can be made inconspicuous.

(Modification 7)
In the above-described embodiment, only air is present in the hole 210, but a resistance material such as glass wool that provides resistance to vibrating air may be provided.
FIG. 15 is a view showing a rib 200 according to this modification. Glass wool 220 is provided in the hole 210. In this case, the sound pressure generated when the air in the hole 210 vibrates at the resonance frequency changes due to the resistance of the glass wool 220, and the magnitude of the generated resonance sound changes. The resistance material is not limited to glass wool. Further, the resistance material may not be provided in the entire hole 210 as in the glass wool 220 shown in FIG. 15, or may be provided only in a part of the opening side or the like. You may provide so that it may satisfy | fill. In the rib 200, the magnitude of the resonance sound can be changed in various ways by changing the material, position, or amount of the resistance material provided in the hole 210. Instead of providing a resistance material in the hole in the rib, the rib itself may be formed to have a shape having a porous hole inside. Even in this case, the hole of the rib may be any hole that opens into the internal space 101 and resonates sound at a specific frequency.

(Modification 8)
The rib 200 may vibrate the air in the hole 210 at a frequency corresponding to the natural frequency of the head main body 100 and resonate the air. Further, the frequency of the sound with which the hole 210 resonates may be an integer multiple of the natural frequency. For example, the hole 210 has a height h calculated when the frequency f1 of the above formula (1) is the natural frequency of the head body 100, and both ends open into the internal space 101. In this case, the rib 200 is also formed so that the length in the direction H is h. Alternatively, the hole 210 has a height h calculated when the frequency f1a of the above formula (3) is set as the natural frequency of the face portion 110, and one side opens into the internal space 101. The head main body 100 vibrates more strongly at the natural frequency than the other frequencies at the time of hitting. Therefore, according to the configuration according to this modification, the force transmitted from the golf ball to the head body 100 by the hit ball can be more efficiently generated compared to the case where the natural frequency and the resonance frequency of the head body 100 are different. It can be converted to energy. The frequency of the sound that the hole 210 resonates does not have to be exactly the same as the natural frequency of the head body 100. In short, the frequency of the sound that the hole 210 resonates may be a frequency corresponding to the natural frequency so that the kinetic energy of the head main body 100 that vibrates at the natural frequency can be efficiently converted into the energy of the resonant sound. .

(Modification 9)
In the above-described embodiment, the rib 200 was provided in the golf club head, which is a head 10 used as a so-called driver. It may be fairway wood (fairway metal) or iron. In addition, the rib having a hole that forms a resonance space like the rib 200 is not limited to a golf club head, and may be any other type as long as it has a hollow main body such as a metal bat and is used by colliding with a ball. It may be provided on the tool. Even in this case, the tool provided with the rib can generate a sound having a specific frequency adjusted when the tool collides with a ball or the like.

DESCRIPTION OF SYMBOLS 1 ... Golf club, 10 ... Head, 20 ... Shaft, 30 ... Grip, 100 ... Head main body, 101 ... Internal space, 110 ... Face part, 110S ... Hitting surface, 110R ... Inner surface, 111 ... Edge part, 112 ... Cut-out part , 120 ... Crown part, 130 ... Sole part, 200 ... Rib, 210 ... Hole, 211, 212, 213 ... Opening part, 220 ... Glass wool, 300 ... Resonance space

Claims (5)

A head body in which a space is formed by a face portion, a crown portion and a sole portion, and a golf ball collides and vibrates at the time of hitting,
A rib provided on the inner surface of the head body,
The rib has a hole opening in the space,
The golf club head characterized in that the hole resonates sound at a specific frequency. The golf club head according to claim 1, wherein the rib is provided on the face portion that the golf ball collides with when the ball is hit. The hole extends in a direction along a ball striking surface on which the golf ball collides at the time of hitting in the face portion, and opens into the space at one end in the direction;
The end of the face portion is bent to the side where the rib is provided, and has a shape that is notched so as not to intersect with the region where the hole extends from the one end in the direction. The golf club head according to claim 2. The golf club head according to any one of claims 1 to 3, wherein the hole resonates at a frequency corresponding to a natural frequency of the head body. The golf club head according to any one of claims 1 to 4, wherein a resistance material that serves as a resistance of vibrating air is provided inside the hole.

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