Golf Clubs

Abstract

To provide a golf club that can suppress deterioration in durability of a face comprising at least three layers and is used for ground golf or park golf.SOLUTION: A golf club 100 includes a head 101 for hitting a golf ball. The head 101 is provided with a face 103 in a head body 102 to which a shaft 130 is connected. The face 103 is configured by being laminated with a first layer 104, a second layer 110 and a third layer 115. The first layer 104 includes an annular cover part 106 for covering each of the outer peripheral parts of the second layer 110 and the third layer 115. The second layer 110 is formed with exposing parts 111a, 111b, 111c cut out to expose part of the first layer 104 to the third layer 115. The third layer 115 is formed with adhesion parts 117a, 117b, 117c and fitting parts 118a, 118b, 118c at a surface on an opposite side to a tapping surface 115a for hitting the golf ball.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a golf club for use in ground golf or park golf. [Background technology]

[0002] Conventionally, various golf clubs for ground golf or park golf have been proposed. For example, the following Patent Document 1 discloses a golf club with a two-layer face in which a first resin layer is made of a resin material having a higher elastic modulus than a second resin layer. In this case, the following Patent Document 1 also describes that the face is made of a three-layer structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-178182 A

[0004] However, in the golf club described in Patent Document 1, when the face has a three-layer structure, the durability of the three-layer face, which is frequently subjected to impacts from hitting, decreases. In this case, the face made of three layers has a problem that the thinner the second layer disposed between the first and third layers, the more difficult it becomes to ensure and maintain the bonding strength of the second layer to the first layer and the bonding strength of the third layer to the second layer, and the durability is likely to decrease.

[0005] The present invention has been made to address the above-mentioned problems, and its object is to provide a golf club for use in ground golf or park golf that can suppress deterioration in the durability of a face consisting of at least three layers. Summary of the Invention

[0006] In order to achieve the above object, the present invention is characterized in that a golf club for use in ground golf or park golf is provided with a rod-shaped shaft attached to a head for hitting a ball, the head comprising a head body to which the shaft is attached, and a face which serves as the portion for hitting a ball and which is formed by laminating at least three layers, in the order of a first layer, a second layer, and a third layer, on the head body, the first layer being: It is formed into a flat plate and one side is Attached to the head body and a mounting portion on the other side of which the second layer is mounted, and a wall-like wall rising from the outer edge of the mounting portion and formed in a continuous or discontinuous ring shape along the outer edge, so that the inner wall portion suppresses positional deviation between the second layer and the third layer while the outer wall portion is exposed to the outside. Cover parts that cover the outer periphery of the second and third layers and The point is that it has the following features.

[0007] According to the features of the present invention configured in this manner, the golf club has a face which is the part that hits the ball and is made up of at least three stacked layers, a first layer, a second layer, and a third layer, and the first layer of the face has a cover portion which covers the outer periphery of the second and third layers. This effectively prevents the second and third layers from shifting out of position relative to the first layer, thereby preventing a decrease in the durability of the face.

[0008] Another feature of the present invention is that, in the golf club, the second layer is The head body has an exposed portion that exposes a part of the surface of the attachment portion of the first layer to the third layer, and the third layer is joined to the surface of the attachment portion of the first layer via the exposed portion of the second layer. The point is that.

[0009] According to the features of the present invention thus configured, By holding the second layer between the first and third layers, it is possible to effectively suppress misalignment of the second and third layers relative to the first layer, thereby suppressing a decrease in the durability of the face.

[0010] In order to achieve the above object, the present invention is characterized in that a golf club used for ground golf or park golf is provided with a rod-shaped shaft attached to a head for hitting a ball, the head comprising: a head body to which the shaft is attached; and a face which serves as the part for hitting the ball and which is formed by laminating at least three layers, in the order of a first layer, a second layer, and a third layer, on the head body; the first layer is formed in a flat plate shape, one surface of which is attached to the head body, and the other surface of which has an attachment portion to which the second layer is attached; The second layer is the first layer attached to the head body. The surface of the mounting part The third layer has an exposed portion that exposes a part of the second layer to the third layer, and the third layer is connected to the first layer through the exposed portion of the second layer. The surface of the mounting part The problem is that it is joined to

[0011] According to the features of the present invention configured in this manner, the golf club has the third layer joined to the first layer via the exposed portion formed in the second layer, so that by holding the second layer between the first and third layers, misalignment of the second and third layers relative to the first layer can be effectively suppressed, thereby suppressing a decrease in the durability of the face.

[0012] Another feature of the present invention is that, in the golf club, The first layer is made of an elastomeric material, and the second layer is made of carbon fiber, glass fiber, or metal materials, either alone or in combination. The reason is that it is being done.

[0013] Another feature of the present invention is that, in the golf club, The third layer is made of a transparent or translucent material. The reason is that...

[0014] Another feature of the present invention is that, in the golf club, the first layer has an exposed portion communicating portion formed in a concave shape in communication with the exposed portion, and the third layer has The fitting portion has a convex shape, and the fitting portion is Through the exposed area The exposed portion communicating portion The problem is that the casing is fitted into the casing.

[0015] According to another feature of the present invention configured in this manner, the golf club has an exposed portion connecting portion formed by a concave recess in which the first layer is connected to the exposed portion of the second layer, and the third layer is fitted through the exposed portion, so that misalignment of the second and third layers relative to the first layer can be more effectively suppressed, thereby suppressing a decrease in the durability of the face.

[0016] Another feature of the present invention is that, in the golf club, the second layer is formed to be thinner than the first and third layers.

[0017] According to another feature of the present invention configured in this manner, the second layer of the golf club is formed to be thinner than the first and third layers, thereby effectively suppressing misalignment of the second and third layers relative to the first layer and improving the durability of the face.

[0018] Also, in these cases In the golf club, the second layer has a third layer uneven portion formed in a concave or convex shape facing the third layer. According to this, Since the second layer of the golf club has a third layer uneven portion formed in a concave or convex shape facing the third layer, the bonding strength between the second layer and the third layer can be improved and a decrease in the durability of the face can be suppressed.

[0019] Also, in these cases In the golf club, at least two exposed portions are formed. According to this, Since the golf club has at least two exposed portions, the first layer and the third layer can be more strongly bonded to each other, thereby effectively suppressing misalignment of the second and third layers relative to the first layer and suppressing a decrease in the durability of the face. [Brief description of the drawings]

[0020] [Figure 1] 1 is a front view showing an outline of the overall configuration of a golf club according to an embodiment of the present invention; [Diagram 2] 2 is a partially enlarged perspective view of the external configuration of the head of the golf club shown in FIG. 1, as viewed obliquely from below. [Diagram 3] 3 is a cross-sectional view showing the internal structure of the head as seen from 3-3 shown in FIG. [Figure 4] 4 is an exploded perspective view of the head shown in FIG. 3, in which a first layer and a second layer that constitute a face are disassembled. [Diagram 5] 5 is a plan view showing the state in which the second layer is fitted into the first layer shown in FIG. 4. FIG. [Figure 6] 2 is a perspective view showing the external configuration of a third layer constituting the face shown in FIG. 1, as viewed from the second layer side. FIG. [Figure 7] FIG. 11 is a perspective view showing the external configuration of a third layer according to a modified example of the present invention, as viewed from the second layer side. [Figure 8] FIG. 11 is a perspective view showing the external configuration of a third layer according to another modified example of the present invention, as viewed from the second layer side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] An embodiment of a golf club according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an outline of the overall configuration of a golf club 100 according to the present invention. FIG. 2 is a partially enlarged perspective view of the external configuration of a head 101 of the golf club 100 shown in FIG. 1, seen obliquely from below. FIG. 3 is a cross-sectional view showing the internal structure of the head 101, seen from 3-3 shown in FIG. 1. FIG. 4 is an exploded perspective view in which a first layer 104 and a second layer 110 constituting a face 103 in the head 101 shown in FIG. 3 are exploded. This golf club 100 is a rod-shaped tool for hitting a golf ball (not shown) in ground golf or park golf.

[0022] (Configuration of Golf Club 100) Golf club 100 is mainly composed of a head 101 and a shaft 130. Head 101 is a part of golf club 100 for hitting a resin golf ball used in ground golf or park golf, and is mainly composed of a head body 102 and a face 103.

[0023] The head body 102 is a part that ensures the rigidity of the entire head 101, and is configured by forming a rigid body (for example, wood) into a block shape. In this case, the head body 102 is formed in a substantially rectangular parallelepiped shape (strictly speaking, polyhedral shape) that extends long in the horizontal direction with respect to the height direction (also called the "vertical direction"). The head body 102 has a face attachment part 102a in the shape of a flat surface that extends vertically on a part of the outer surface, and the face 103 is attached to the face attachment part 102a. In this case, the face attachment part 102a has two bottomed cylindrical attachment holes 102b and 102c, into which fitting parts 118b and 118c, which will be described later, are fitted. In addition, a sole 120 is attached to the lower surface part of the head body 102.

[0024] The face 103 is a component that strikes a golf ball by colliding with it, and is configured in a flat plate shape. More specifically, the face 103 is mainly configured by integrating a first layer 104, a second layer 110, and a third layer 115.

[0025] The first layer 104 is a part attached to the head body 102 while supporting the second layer 110 and the third layer 115, and is formed by forming an elastomer material into a plate shape. Here, the elastomer material is a rubber material or a resin material having elasticity that elastically deforms when hitting a golf ball, and more specifically, there is a thermosetting elastomer material (for example, vulcanized rubber, urethane rubber, silicone rubber, fluororubber, etc.) and a thermoplastic elastomer material (for example, styrene-based, olefin-based, PVC-based, urethane-based, or amide-based resin, etc.). In this embodiment, the first layer 104 is formed of a thermoplastic polyurethane resin having a durometer hardness value within the range of 74D±10D (temperature 23°C±2°C, humidity 50%±5%).

[0026] The first layer 104 is mainly composed of an attachment portion 105 and a cover portion 106. The attachment portion 105 is formed in a flat plate shape, one surface of which is attached to the head body 102, and the other surface of which is to which the second layer 110 is attached, and these two surfaces are each formed in a planar shape. In this embodiment, the attachment portion 105 is formed in a flat plate shape with a thickness of 3 mm. The attachment portion 105 is formed with an introduction hole 105a and two exposed portion communication portions 105b, 105c.

[0027] The introduction hole 105a is a through hole that becomes a material flow portion when the third layer 115 is injection molded, and is formed on the upper side of the longitudinal center portion (the left-right center portion in the figure) of the attachment portion 105. This introduction hole 105a communicates with the exposed portion 111a described later, and is also a portion into which the fitting portion 118a described later fits. The exposed portion communication portions 105b, 105c are through holes that communicate with the exposed portions 111b, 111c described later, respectively, and into which the fitting portions 118b, 118b fit, and are formed in the vertical center portions on both sides of the longitudinal center portion of the attachment portion 105.

[0028] The cover portion 106 is a portion that covers the outer peripheries of the second layer 110 and the third layer 115, and is formed in the shape of a wall that stands up on the outer edge of the mounting portion 105. In this embodiment, the cover portion 106 is formed in a continuous ring shape along the outer edge of the mounting portion 105. The cover portion 106 is formed to a height that is flush with the surface of the third layer 115. The first layer 104 is formed by various processing methods such as injection molding using an injection molding machine (not shown) or cutting.

[0029] The second layer 110 is a component provided between the first layer 104 and the third layer 115, and is formed in a plate shape. The second layer 110 is made of various materials depending on the requirements for the aesthetics of the face 103 or the impact performance of the face 103. For example, the second layer 110 can be made of a material such as paper, wood, resin, rubber, ceramic, carbon fiber, glass fiber, or metal, either alone or in combination. In this embodiment, the second layer 110 is made of carbon fiber reinforced plastic (CFRP) formed into a plate shape with a thickness of 0.3 mm.

[0030] 5, the second layer 110 has an outer periphery formed in a shape that fits into the cover portion 106 of the first layer 104, and three exposed portions 111a, 111b, and 111c are formed on a part of the outer periphery. The exposed portions 111a, 111b, and 111c are portions for exposing the surface of the first layer 104 to the third layer 115 and bonding the third layer 115 to the first layer 104, and are formed by cutting out a part of the second layer 110. In this embodiment, the exposed portions 111a, 111b, and 111c are formed in a state of communicating with the introduction hole 105a and the two exposed portion communicating portions 105b and 105c.

[0031] The exposed portion 111a is formed to extend in the longitudinal direction while being connected to the introduction hole 105a of the second layer 110. The exposed portions 111b and 111c are formed in a semi-elliptical shape toward the outside of the second layer 110 while being connected to the exposed portion communication portions 105b and 105c. In other words, the exposed portions 111a, 111b, and 111c are formed to expand from the inside of the second layer 110 toward the outside.

[0032] The third layer 115 is a component that constitutes the striking surface 115a that is exposed on the head body 102 and strikes the golf ball, and is configured by forming various elastomer materials similar to those of the first layer 104 into a plate shape. In this embodiment, the third layer 115 is configured by forming a thermosetting polyurethane resin having a durometer hardness value of 95A±10A (temperature 23°C±2°C, humidity 50%±5%) into a plate-like body with a thickness of 3.7 mm.

[0033] Moreover, the third layer 115 is made of a translucent resin material, and is configured so that the presence of the second layer 110 and the first layer 104 can be visually confirmed from the outside. In Fig. 1, the state in which the second layer 110 is thinly visible through the third layer 115 is expressed by showing the second layer 110 with light hatching. Also, it goes without saying that the third layer 115 may be made of a transparent material or an opaque material.

[0034] The third layer 115 is mainly composed of a main body 116, contact parts 117a, 117b, 117c, and fitting parts 118a, 118b, 118c. The main body 116 is formed in a flat plate shape, with one surface covering the second layer 110 and the other surface forming a hitting surface 115a for hitting a golf ball, and these two surfaces are each formed in a flat shape. On the surface of the main body 116 facing the second layer 110, as shown in FIG. 6, the contact parts 117a, 117b, 117c and fitting parts 118a, 118b, 118c are formed.

[0035] The contact portions 117a, 117b, and 117c are portions that are bonded to the first layer 104 via the exposed portions 111a, 111b, and 111c, and are formed in a shape that protrudes convexly from the main body portion 116 and fits into the exposed portions 111a, 111b, and 111c, respectively. In this case, the contact portion 117a is bonded to the first layer 104 via the exposed portion 111a. The contact portion 117b is bonded to the first layer 104 via the exposed portion 111b. The contact portion 117c is bonded to the first layer 104 via the exposed portion 111c.

[0036] The fitting parts 118a, 118b, and 118c are parts that fit into the introduction hole 105a and the exposed part communication parts 105b and 105c, respectively, and are formed in a columnar shape that protrudes convexly from the main body part 116 and fits into the introduction hole 105a and the exposed part communication parts 105b and 105c, respectively. In this case, the fitting part 118a is formed in a cylindrical shape that fits into the introduction hole 105a. Moreover, the fitting part 118b is formed in a cylindrical shape with a length that fits into the exposed part communication part 105b and the mounting hole 102b formed in the head main body 102. Moreover, the fitting part 118c is formed in a cylindrical shape with a length that fits into the exposed part communication part 105c and the mounting hole 102c formed in the head main body 102. The third layer 115 is formed by various processing methods such as injection molding using an injection molding machine (not shown) or cutting.

[0037] The sole 120 is a part for protecting the underside of the head body 102, and is made of brass or aluminum formed into a curved shape along the bottom surface of the head body 102. In this case, the sole 120 is formed to a size that covers not only the bottom surface of the head body 102 but also the bottom surface of the face 103. This sole 120 is attached to the bottom surface of the head body 102 with a screw. The sole 120 can also be formed in a shape that covers only the bottom surface of the head body 102 and does not cover the bottom surface of the face 103. The sole 120 can also be omitted.

[0038] The shaft 130 is a component that supports the head 101 so that it can swing, and is made of wood or carbon material formed into a rod shape. The head body 102 is attached to one end (lower side in the figure) of the shaft 130, and the grip 131 is attached to the other end (upper side in the figure). In this case, the shaft 130 is attached to the head body 102 in a position in which the face 103 is in an upright position and extends upward while inclining downward with respect to the vertical direction. More specifically, the shaft 130 is attached to the head body 102 in a position in which the face 103 is inclined in a direction extending horizontally with respect to the vertical direction (to the right in FIG. 1).

[0039] The grip 131 is a part that is held by a user playing golf and is made of a rubber material formed into a cylindrical shape. The grip 131 is inserted onto the other end of the shaft 130.

[0040] (Manufacturing 100 golf clubs) Here, a brief description will be given of the manufacturing process of the golf club 100. First, in the first step, an operator manufactures the first layer 104. Specifically, the operator uses an injection molding machine (not shown) to mold the first layer 104 by injection molding. That is, the first layer 104 can be molded by a known method.

[0041] Next, in the second step, the worker manufactures the second layer 110. Specifically, the worker can mold the CFRP second layer 110 by stacking carbon fiber prepreg material in a mold, impregnating it with a resin material, and curing it. That is, the second layer 110 can be molded by a known method.

[0042] Next, in the third step, the worker molds the third layer 115 to manufacture the face 103. Specifically, the worker places the first layer 104 in a mold (not shown) for molding the face 103, and places the second layer 110 in a fitted state within the first layer 104 (see FIG. 5). Then, the worker uses an injection molding machine (not shown) to inject a resin material into the mold in which the first layer 104 and the second layer 110 are placed, thereby injection molding the third layer 115. That is, the face 103 is molded such that the third layer 115 is integrally formed with the first layer 104 and the second layer 110 by insert molding in which the first layer 104 and the second layer 110 are placed in the mold.

[0043] In this case, the resin material supplied from the injection molding machine flows into the area surrounded by the cover portion 106 in the first layer 104 through the introduction hole 105a of the first layer 104 and fills the area. In this case, the mold in which the first layer 104 and the second layer 110 are set has recesses for molding the fitting portions 118b, 118c in a state in communication with the exposed portion communication portions 105b, 105c. Therefore, the resin material flowing into the mold flows into the exposed portions 111a, 111b, 111c, and the resin material flowing into the exposed portions 111b, 111c flows into the recesses through the exposed portion communication portions 105b, 105c.

[0044] As a result, the third layer 115 is molded in the mold with the contact portions 117a, 117b, 117c and the fitting portions 118a, 118b, 118c formed in addition to the main body portion 116. In this case, as the resin material solidifies, the third layer 115 is bonded to the first layer 104 at its portion in contact with the first layer 104 (the outer periphery of the main body portion 116, the contact portions 117a, 117b, 117c, and the fitting portions 118a, 118b, 118c), and bonded to the second layer 110 at its portion in contact with the second layer 110 (the main body portion 116, the outer periphery of the contact portions 117a, 117b, 117c, and the outer periphery of the fitting portions 118a, 118b, 118c).

[0045] That is, face 103 is formed integrally by bonding third layer 115 to first layer 104 and second layer 110. Note that face 103 can also be produced by molding third layer 115 separately and then fitting and adhering it to first layer 104, without insert molding third layer 115.

[0046] Next, in the third step, the worker prepares the head body 102. Specifically, the worker shapes the head body 102 by cutting wood.

[0047] Next, in the fourth step, the worker attaches the face 103 to the head body 102. Specifically, the worker applies adhesive to the back surface of the face 103 (the surface opposite to the third layer 115) and attaches it to the head body 102. In this case, two fitting portions 118b, 118b protruding from the back surface of the face 103 fit into mounting holes 102b, 102c formed in the face mounting portion 102a of the head body 102, respectively.

[0048] Next, in a fifth step, the worker prepares the sole 120 and attaches it to the head body 102. Specifically, the worker attaches the sole 120, which has been separately manufactured using a processing method such as pressing or casting, to the underside of the head body 102 using screws (not shown).

[0049] Next, in the sixth step, the worker prepares the shaft 130 and attaches it to the head body 102. Specifically, the worker inserts the shaft 130, which is separately manufactured by cutting and painting wood, into the upper surface of the head body 102 and attaches it. Next, the worker inserts the grip 131, which is manufactured in a separate process, into the upper end of the shaft 130 and attaches it. It should be noted that the grip 131 may of course be attached in advance to the shaft 130 before it is inserted into the head body 102. Thereafter, the worker completes the golf club 100 through an inspection process for testing the appearance and feel in use.

[0050] (Operation of Golf Club 100) Next, the operation of the golf club 100 configured as above will be described. A player playing ground golf (or park golf) holds the grip 131 and swings the head 101 to hit a golf ball with the face 103. In this case, the golf club 100 has the second layer 110 and the third layer 115 covered at their outer peripheries by the cover portion 106 of the first layer 104, and the second layer 110 is held between the first layer 104 and the third layer 115, so that it is possible to suppress displacement and peeling due to the impact of hitting a golf ball.

[0051] As can be understood from the above operation description, according to the above embodiment, the golf club 100 has a face 103 which is the part that hits a golf ball, and is made up of three laminated layers, namely, a first layer 104, a second layer 110 and a third layer 115. The first layer 104 of the face 103 has a cover portion 106 which covers the outer periphery of the second layer 110 and the third layer 115, so that it is possible to effectively suppress misalignment of the second layer 110 and the third layer 115 relative to the first layer 104 and suppress a decrease in the durability of the face 103.

[0052] Furthermore, since the third layer 115 of the golf club 100 is joined to the first layer 104 via exposed portions 111a, 111b, and 111c formed on the second layer 110, by sandwiching and holding the second layer 110 between the first layer 104 and the third layer 115, it is possible to effectively suppress misalignment of the second layer 110 and the third layer 115 relative to the first layer 104, thereby suppressing a decrease in the durability of the face 103.

[0053] Furthermore, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the scope of the present invention. In the drawings used to explain each modification, the same reference numerals are used to designate the same parts as those in the above-described embodiment.

[0054] For example, in the above embodiment, the face 103 is configured such that the first layer 104 has a durometer hardness of 74D and the third layer 115 has a durometer hardness of 95A. That is, the face 103 is configured such that the first layer 104 is made of a material harder (less prone to elastic deformation) than the third layer 115. In this case, by configuring the first layer 104 of the face 103 with a material harder than the third layer 115, deformation and displacement of the third layer 115 and the second layer 110 can be effectively suppressed. However, the hardness values ​​of the first layer 104 and the third layer 115 are not limited to those in the above embodiment and may be freely set according to the use of the golf club 100.

[0055] In the above embodiment, the face 103 is formed to have an overall thickness of 7 mm, with the first layer 104 having a thickness of 3 mm, the second layer 110 having a thickness of 0.3 mm, and the third layer 115 having a thickness of 3.7 mm. However, the thicknesses of the first layer 104, the second layer 110, and the third layer 115 of the face 103 may be freely set.

[0056] In the above embodiment, the face 103 is formed such that the thickness of the second layer 110 is thinner than the thicknesses of the first layer 104 and the third layer 115. In this case, in the golf club 100 according to the present invention, the cover portion 106 and / or the third layer 115 formed on the first layer 104 penetrates the second layer 110 and is joined to the first layer 104, so that the thin second layer 110 can be held while suppressing deformation or damage. However, the thickness of the second layer 110 can be freely set, and it is natural that the second layer 110 may be formed to be the same thickness as the first layer 104 and the third layer 115 or thicker than the first layer 104 and the third layer 115.

[0057] In the above embodiment, the second layer 110 is formed in a shape that fits into the inner wall of the cover portion 106 of the first layer 104 (see FIG. 5). However, the second layer 110 only needs to be disposed between the first layer 104 and the third layer 115. Therefore, the second layer 110 may be configured such that a recess is provided in the mounting portion 105 of the first layer 104 and a part or all of the second layer 110 fits into this recess, or a recess is provided in the main body portion 116 of the third layer 115 and a part or all of the second layer 110 fits into this recess, or further, the second layer 110 may be provided in a state that does not fit into either the first layer 104 or the third layer 115.

[0058] In the above embodiment, the exposed portions 111a, 111b, and 111c formed in the second layer 110 are formed in a state in which the outer periphery of the second layer 110 is cut out. As a result, the third layer 115 is bonded to the inner periphery of the cover portion 106 of the first layer 104 by the adhesion portions 117a, 117b, and 117c, so that the bonding strength between the first layer 104 and the third layer 115 and the fixing strength of the second layer 110 can be improved. However, the exposed portions 111a, 111b, and 111c can also be formed in the shape of through holes inside the second layer 110. According to this, the second layer 110 is formed in a continuous manner without the outer periphery being cut out, so that the rigidity of the second layer 110 can be improved.

[0059] In the above embodiment, the exposed portions 111a, 111b, and 111c are formed so that the notch width becomes wider from the inside to the outside of the second layer 110. This increases the contact area of ​​the adhesion portions 117a, 117b, and 117c with the inner circumferential surface of the cover portion 106 while suppressing a reduction in the formed portion of the second layer 110, thereby suppressing the concentration of the pressing force on the inner circumferential surface. However, the exposed portions 111a, 111b, and 111c can also be formed so that the notch width is the same on the inside and outside of the second layer 110, or the notch width becomes narrower from the inside to the outside.

[0060] In the above embodiment, the face 103 is configured by providing the exposed portions 111a, 111b, and 111c on the second layer 110. As a result, the third layer 115 of the face 103 is bonded to the first layer 104 via the exposed portions 111a, 111b, and 111c, and therefore the second layer 110 is sandwiched and held between the first layer 104 and the third layer 115, thereby effectively suppressing positional deviation of the second layer 110 and the third layer 115 relative to the first layer 104, and suppressing deterioration in durability of the face 103.

[0061] Furthermore, in the face 103, the third layer 115 is bonded to the second layer 110 via the exposed portions 111a, 111b, and 111c formed in the second layer 110, and therefore it is possible to improve the bonding strength between the second layer 110 and the third layer 115 and suppress a decrease in the durability of the face 103. In this case, in terms of the bonding strength between the second layer 110 and the third layer 115, the exposed portions 111a, 111b, and 111c do not necessarily need to be configured as notched shapes or through holes.

[0062] That is, the exposed portions 111a, 111b, and 111c can be formed as third-layer uneven portions 112a, 112b, 112c, 113a, 113b, and 113c having a shape recessed in a concave manner from the plate surface of the second layer 110 or a shape protruding in a convex manner from the plate surface of the second layer 110, as shown in Fig. 7 and Fig. 8, respectively. With this, the third layer 115 is bonded to the second layer 110 via the third-layer uneven portions 112a, 112b, 112c, 113a, 113b, and 113c by the third-layer uneven portions 112a, 112b, 112c, 113a, 113b, and 113c formed in the second layer 110, so that the bonding strength between the second layer 110 and the third layer 115 can be improved to suppress a decrease in durability of the face 103.

[0063] In addition, the third layer uneven portions 112a, 112b, 112c, 113a, 113b, and 113c are each formed with a through hole 114a that forms a flow passage for the resin material that constitutes the third layer 115 and also forms the fitting portion 118a, and through holes 114b and 114c that form the fitting portions 118b and 118c, respectively.

[0064] Therefore, the exposed portions 111a, 111b, and 111c can be considered to be equivalent to the third layer uneven portion of the present invention. Note that the exposed portions 111a, 111b, and 111c, the concave third layer uneven portions 112a, 112b, and 112c, and the convex third layer uneven portions 113a, 113b, and 113c can be omitted from the second layer 110 when the first layer 104 is configured to include the cover portion 106.

[0065] Furthermore, in the case where the face 103 is provided with the exposed portions 111a, 111b, 111c or the third layer uneven portions 112a, 112b, 112c, 113a, 113b, 113c, the number of exposed portions is not limited to three, and it is sufficient that the face 103 has at least one, and more preferably at least two or more. In this case, when two or more exposed portions 111a, 111b, 111c or the third layer uneven portions 112a, 112b, 112c, 113a, 113b, 113c are provided, it is preferable to provide them in symmetrical positions with respect to a straight line passing through the center of gravity of the face 103.

[0066] In the above embodiment, the face 103 is configured such that the first layer 104 includes the cover portion 106. However, the face 103 may be configured to be omitted when the second layer 110 is configured to have at least one exposed portion 111a, 111b, 111c. Even in this case, the third layer 115 is bonded to the second layer 110 via at least one exposed portion 111a, 111b, 111c formed in the second layer 110, and thus the bonding strength between the second layer 110 and the third layer 115 can be improved to suppress a decrease in durability of the face 103. The cover portion 106 may also be configured to cover the outer peripheries of the second layer 110 and the third layer 115 intermittently.

[0067] In the above embodiment, the third layer 115 is configured to have three fitting portions 118a, 118b, and 118b. However, the third layer 115 may be configured to omit the fitting portions 118a, 118b, and 118b. In addition, when the third layer 115 includes the fitting portions 118a, 118b, and 118b, it is sufficient to include at least one of them. In addition, the fitting portions 118b and 118b may be formed to a length that does not fit into the mounting holes 102b and 102c of the head body 102.

[0068] In the above embodiment, the face 103 is composed of three layers, the first layer 104, the second layer 110, and the third layer 115. However, the face 103 only needs to be composed of at least three layers, and may be composed of four or more layers. In this case, the first layer 104 may be composed so that the outer periphery of each layer from the fourth layer onwards is covered by the cover portion 106, or may be composed so that it is exposed without being covered. [Explanation of symbols]

[0069] 100...golf club, 101...head, 102...head body, 102a...face mounting portion, 102b, 102c...mounting holes, 103...face, 104...first layer, 105...mounting portion, 105a...introduction hole, 105b, 105c...exposed portion communication portion, 106...cover portion, 110...Second layer, 111a, 111b, 111c...Exposed part, 112a, 112b, 112c...Uneven part for third layer, 113a, 113b, 113c...Uneven part for third layer, 114a, 114b, 114c...Through hole, 115... third layer, 115a... striking surface, 116... main body portion, 117a, 117b, 117c... contact portion, 118a, 118b, 118c... fitting portion, 120…sole, 130...shaft, 131...grip.

Claims

1. A golf club used for ground golf or park golf, in which a rod-shaped shaft is provided on a head for hitting a ball, The head is a head body to which the shaft is attached; a face that is a portion that hits the ball and is formed by laminating at least three layers, in the order of a first layer, a second layer, and a third layer, on the head body; The first layer is a mounting portion formed in a flat plate shape, one surface of which is attached to the head body and the second layer is attached to the other surface of the mounting portion; a cover portion that rises like a wall from the outer edge of the mounting portion, is formed in a continuous or intermittent ring shape along the outer edge, and covers the outer periphery of each of the second layer and the third layer while the inner wall portion is exposed to the outside, so as to suppress misalignment of the second layer and the third layer.

2. 2. The golf club according to claim 1, The second layer is an exposed portion that exposes a part of a surface of the attachment portion of the first layer attached to the head body to the third layer; The third layer is a surface of the attachment portion of the first layer being joined via the exposed portion of the second layer.

3. A golf club used for ground golf or park golf, in which a rod-shaped shaft is provided on a head for hitting a ball, The head is a head body to which the shaft is attached; a face that is a portion that hits the ball and is formed by laminating at least three layers, in the order of a first layer, a second layer, and a third layer, on the head body; The first layer is a mounting portion formed in a flat plate shape, one surface of which is attached to the head body and the second layer is attached to the other surface of the mounting portion; The second layer is an exposed portion that exposes a part of a surface of the attachment portion of the first layer attached to the head body to the third layer; The third layer is a surface of the attachment portion of the first layer being joined via the exposed portion of the second layer.

4. A golf club according to any one of claims 1 to 3, the first layer being constructed from an elastomeric material; The second layer is made of a material such as carbon fiber, glass fiber, or metal, either alone or in combination.

5. A golf club as claimed in claim 4, The third layer is made of a transparent or translucent material.

6. A golf club according to claim 2 or claim 3, The first layer is an exposed portion communication portion formed in a concave shape in communication with the exposed portion, The third layer is 1. A golf club comprising: a convexly protruding fitting portion, the fitting portion fitting into the exposed portion communicating portion via the exposed portion.

7. A golf club according to any one of claims 1 to 6, The second layer is A golf club comprising: a first layer and a second layer;

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