KR20050025227A - Iron type golf club head - Google Patents

Abstract

An iron golf club head is provided to improve contact between a head body and an FRP body disposed in a recess. The iron golf club head includes a head main body and an FRP body(16). The head main body includes a face portion(21), a first face along the face portion, second faces, and a recess(20) behind the head portion. The second faces continue from a rear face of the face portion to the first face. The recess is defined by the first face and the second faces. The hollow FRP body is disposed in the recess, overlaps the first face and the second faces, and closes an opening portion of the recess. At least a part of crossing corner portions between the first face and the second faces has a curved face.

Description

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

The present invention relates to a head of a golf club for hitting a golf ball, and more particularly to an iron type golf club head. Specifically, the present invention relates to an iron golf club head having a head body having a recess (cavity) recessed from the rear face and a FRP member provided in the recess.

Iron-type golf club heads have conventionally been composed of only metal materials such as stainless steel and cast iron, but in recent years, it has been commercially available to dispose of FRP (fiber-reinforced synthetic resin) materials on the rear side of the head body.

For example, Japanese Patent Laid-Open No. 62-97570 discloses an iron club in which a CFRP (carbon fiber-reinforced synthetic resin) layer is attached to the rear surface side of a hitting surface to increase hitting feel.

Japanese Unexamined Patent Application Publication No. 63-19169 discloses that the CFRP layer is attached to the back surface side of the spherical surface, and the CFRP layer is covered with a synthetic resin backup member. FIG. 5 of Japanese Patent Laid-Open No. 63-19169 discloses an iron club head in which the inlet portion of the cavity is also closed by a backup member, and the FRP member has a hollow structure.

Fig. 4 is Fig. 5 of this Japanese Patent Laid-Open No. 63-19169. The head main body 1 of this iron club head has a recessed part 4 in the back side of the hitting surface part 2, and the vertical rising part 8 stands up from the rear edge of the sole surface part 3, and is installed.

The fiber reinforcement member 5 is attached to the inner surface of the recessed part 4 in close contact. The fiber reinforcing member 5 is a hollow housing structure. Further, the publication does not describe how to arrange and form the fiber reinforcing member 5 of the hollow housing structure in the recess 4. The backing member 6 is formed by filling the concave portion 4 with the constituent resin material so as to cover and cover the fiber reinforcing member 5 and performing a curing process (left upper column to lower left column of the fifth page of the publication). ).

[Patent Document 1]

Japanese Patent Laid-Open No. 62-97570

[Patent Document 2]

Japanese Patent Laid-Open No. 63-19169

In the head main body of JP-A-63-19169 shown in Fig. 4, the corner portion of the recess 4 is an acute angle. In such a corner part, a space | gap easily arises between the head main body 1 and the fiber reinforcement member 5. If such a void exists, irregular vibration may occur at the time of hitting the golf ball, resulting in a bad feel.

An object of this invention is to provide the iron type golf club head excellent in the adhesiveness of the FRP member arrange | positioned in a recessed part, and a head main body.

The iron type golf club head of the present invention is a iron type golf club head having a head body provided with a recessed portion behind the face portion, and an FRP member provided in the recessed portion, wherein the recessed portion has an inner surface along the face portion; It has a peripheral wall surface which is vertically lowered from the rear surface of the head body and connected to the inner surface, and the FRP member is hollow in shape, and overlaps the inner surface and the peripheral wall surface of the recess and at the same time closes the inlet portion of the recess. And all or most of the intersecting corner portions of the inner surface and the peripheral wall surface are curved surfaces.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings. 1 is a front view of an iron golf club head according to an embodiment, and FIGS. 2 and 3 (a) to 3 (c) are cross-sectional views taken along lines II-II and III-III of FIG.

The head body 10 of this iron type golf club head has a face portion 11 for hitting a ball, and also has a sole portion 12 to be connected to the lower edge of the face portion 11. The weight material 13 is fixedly attached to this sole part 12. A shaft (not shown) is attached to the hosel portion 14 of the head body 10.

The head body 10 is made of metal such as stainless steel. The face portion 11 may be made of titanium, a titanium alloy, or the like, and other portions may be made of stainless steel or the like.

The head body 10 has a recess 20 recessed from the rear face. The inner face 21 of the recess 20 is formed in a plane parallel to the front face of the face portion 11, and the face portion 11 has a plate shape with a substantially uniform thickness. The peripheral wall surface of the concave portion 20 is vertically lowered from the rear surface of the head body 10 to be connected to the inner surface 21. The peripheral wall surface 22 on the soul side and the peripheral wall surface 23 on the upper edge side. And the peripheral wall surface 24 on the toe side and the peripheral wall surface 25 on the heel side.

These intersecting corner portions of the peripheral wall surfaces 22 to 25 and the inner surface 21 are all curved surfaces that are smoothly concave, except for the vicinity of the die sheet portion 12a of the sole portion 12. The radius of curvature of the curved surface is preferably 1.5 to 80 mm, in particular 2 to 60 mm, in order to prevent a gap between the head main body 10 and the FRP member 16 at this intersection corner.

The inlet side (rear surface side of the head main body 10) of the recessed part 20 has become concave shape so that opening area may become small gradually, so that it is closer to the rear surface of the head main body 10. As shown in FIG. As shown in Fig. 2, the thickness of the corner portion at the inlet side of the concave portion 20 gradually decreases toward the center side of the inlet, and the longitudinal cross-sectional shape of the corner portion is an acute angle as shown in FIG.

The high specific gravity resin layer 15 is stuck to this inner surface 21. It is preferable that this high specific gravity resin layer 15 is comprised using resin materials, such as epoxy, nylon, polyester, urethane, ABS, and thermoplastic elastomer which mix | blended high specific gravity metal powders, such as tungsten or a tungsten alloy, with specific gravity 10 or more. . As for the specific gravity of this high specific gravity resin layer 15, about 10-17, especially about 10-14 are suitable, and about 0.4-1.2 mm is suitable for thickness. Although the high specific gravity resin layer 15 is preferably provided in substantially the whole of the inner side surface 21, it should be included in the vicinity of the center of the inner side surface 21 to cover 50% or more, especially 60% or more of the inner surface area. If it is installed. In addition, in this embodiment, the high specific gravity resin layer 15 is provided so that the periphery may also be slightly caught in the peripheral wall surfaces 22 to 25.

By providing this high specific gravity resin layer 15, vibration of a sash is absorbed and weight adjustment of an iron type golf club head becomes easy.

In the sole part 12, in order to provide the screw hole 13a which mounts the weight material 13, the vicinity of the center of the toe-heel direction of the head main body 10 becomes thick, and the die sheet part 12a is formed, have. The screw hole 13a penetrates the said die sheet part 12a in the up-down direction, and is provided. However, the weight material 13 may be fixedly attached to the head main body 10 by welding or the like rather than twisting.

The FRP member 16 is provided so that the inner surface of the recessed part 20 may be followed. The FRP member 16 has a hollow housing shape that covers the high specific gravity resin layer 15, covers the peripheral wall surfaces 22 to 25, and also closes the inlet portion of the recess 20. In the rear face of the head main body 10, this FRP member 16 becomes the same surface type as the said head main body rear face.

The FRP member 16 is blow molded in the recess 20. In order to perform this blow molding, first, a sheet-like body of the high specific gravity resin layer 15 is inserted into the recessed portion 20 of the head body 10 before attaching the weight material 13 to the inner surface 21. Forge. Although one sheet body may be sufficient, what laminated | stacked multiple sheets of thin film type is suitable. The lamination | stacking of this thin film-type thing in multiple sheets is flexible, it is easy to deform | transform, and it is easy to follow the inner surface of the recessed part 20.

Subsequently, the body of the FRP member 16 is inserted into the recess 20. The body of the FRP member 16 has a hollow housing shape slightly smaller than that of the concave portion 20, and is disposed so as to overlap the body of the high specific gravity resin layer 15 and the peripheral wall surface 22. In this FRP body, a bag such as nylon is arranged.

The body of the FRP member 16 is made of an uncured fiber reinforced synthetic resin. Although carbon fiber is suitable as this fiber, it is not limited to this. In addition, it is preferable to arrange woven fabrics, such as carbon fiber cross, in the outermost layer about the part which comprises the rear surface of the FRP member 16 so that a mesh shape may appear on the rear surface of the FRP member 16. FIG.

Inside the body of this FRP member, a bag made of nylon or the like is arranged. In the bag and the body of the FRP member, a permeation opening is provided at a position overlapped with the screw hole 13a.

After inserting the body of the FRP member 16 into the recessed part 20, the iron type golf club head 10 is mounted to a blow molding die, and a gas such as air is introduced into the FRP member through the screw hole 13a. The bag is inflated by feeding into the bag in the body. As a result, the body of the high specific gravity resin layer 15 is pressed against the inner surface 21, while the body of the FRP member 16 is the body of the high specific gravity resin layer 15, the peripheral wall surfaces 22 to 25, and the mold. It adheres to the inner surface. Subsequently, the mold is heated to cure each element. Thereafter, demolding is performed. After demolding, the bag member is drawn out through the screw hole 13a, and the weight member 13 is twisted into the screw hole 13a.

By this blow molding, the iron type golf club head which the high specific gravity resin layer 15 and the FRP member 16 closely contacted the intersection corner of the inner surface 21 and the peripheral wall surfaces 22-25 is manufactured. In addition, in this embodiment, since the inlet side of the recessed part 20 is retracted, the FRP member 16 adheres also to the inner surface of the inlet edge part of the recessed part. The portion of the FRP member 16 exposed to the rear face of the head body 10 and the rear face of the head body 10 are smoothly continuous in the same plane shape.

5 is a configuration diagram of a golf club head according to the embodiment in which the ribs 30 are provided on the inner surface 21, (a) is a front view, (b), and (c) is a BB line and CC of (a). Line cross section.

In this embodiment, three sets of ribs 30 extending in the vertical direction are provided. Each rib extends from the peripheral wall surface 23 on the upper edge side to the peripheral wall surface 22 on the soul side. By providing this rib 30, the feel of a golf club head can be improved.

In addition, in the inner surface 21, the high specific gravity resin layer 15 and the FRP member 16 exist between the ribs 30 and 30. The rib 30 is not covered with any of the high specific gravity resin layer 15 and the FRP member 16. The other structure of the iron type golf club head of FIG. 5 is the same as that of the said embodiment, and the same code | symbol has shown the same part.

6 is a cross-sectional view of the iron type golf club head according to the embodiment in which the high specific gravity resin layer 15 is provided in the lower portion and the rear portion of the concave portion 20.

This high specific gravity resin layer 15 is arrange | positioned from the rear part of the surrounding wall surface 23 of the soul side to the lower part of the rear surface of the FRP member 16. As shown in FIG. The high specific gravity resin layer is not provided in the inner surface 21.

This FRP member 16 consists of two layers, an outer layer 16a and an inner layer 16b. The high specific gravity resin layer 15 is arranged in a state sandwiched between the outer layer 16a and the inner layer 16b and is embedded in the FRP member 16.

The other structure of this iron type golf club head is the same as that of embodiment of FIGS. 1-4, and the same code | symbol has shown the same part.

According to the iron type golf club head, since the center of gravity is deep and low, the ball is stabilized and the ball is easy to lift.

The above embodiment is an example of the present invention, and the present invention may also adopt a form other than illustrated. For example, in the present invention, the weight material 13 may be omitted. Moreover, you may adhere | attach elastic bodies, such as a vibration absorption rubber | gum, resin, an elastomer, and an impact absorber on the inner surface of the FRP member 16. FIG.

Also in the form of FIG. 5 with a rib, the high specific gravity resin layer 15 may be provided in the lower part and the rear part of the recessed part 20. FIG.

<Example>

(1st and 2nd Example)

In the golf club head shown in Figs. 1 to 4, the radius of curvature of the intersection corner of the upper peripheral wall surface 23 and the inner surface 21 is set to 2 mm, and the sole side peripheral wall surface 22 and the inner surface ( The radius of curvature of the intersection corners of 21) was 50 mm or 70 mm. The FRP member 16 was formed by stacking three layers of two layers of UD prepreg using carbon fibers having an elastic modulus of 24 t / mm 2 and one layer of cross prepreg using the carbon fiber.

As a result, the feel of the golf club head was good.

(Third, fourth embodiment)

Golf club heads having the same configuration were produced except that the high specific gravity resin layer 15 was omitted in the first and second embodiments. These golf club heads also had a good feel.

(Example 5)

A golf club head having the same configuration as that of the first embodiment was produced except that the ribs 30 were provided as shown in FIG. In addition, the width of the rib in the toe-heel direction is 2 mm, and the height from the inner surface 21 is 2 mm.

This golf club head had a very good feel.

(Example 6)

A golf club head having the same configuration as that of the first embodiment was produced except that the high specific gravity resin layer was disposed on the rear side of the soul side as shown in FIG. In addition, the high specific gravity resin layer along an inner surface is abbreviate | omitted. The golf club head had a good feel and a stable flying distance.

In the iron type golf club head of this invention, since the intersection corner of an inner side surface and the peripheral wall surface is made into the curved surface, a space | gap is produced between this FRP member and a head main body in this intersection corner.

The FRP member is preferably formed so that a plurality of UD prepregs containing length fibers such as carbon fibers and glass fibers, or a plurality of prepregs of crosses of the fibers are laminated and in close contact with the head body.

In particular, by forming the FRP member by blow molding in the recess, the gap between the recess and the peripheral wall surface is almost completely eliminated. In this case, the opening area is gradually reduced as the inlet portion of the concave portion approaches the inlet portion of the head body, thereby eliminating the gap between the inlet edge portion of the concave portion and the FRP member.

In this invention, you may provide a high specific gravity resin layer in the inner surface of a recessed part, the lower part in a recessed part, and a rear part. By providing this high specific gravity resin layer, the vibration absorption characteristic of a chassis is improved. Also, the center of gravity can be deepened to stabilize the shot. Moreover, the weight adjustment of an iron type golf club head can also be performed with a high specific gravity resin layer.

1 is a front view of an iron golf club head according to an embodiment.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1; FIG.

3 (a) to 3 (c) are cross-sectional views taken along the line III-III of FIG.

4 is a sectional view of a conventional iron type golf club head.

5 is a configuration diagram showing another embodiment.

6 is a cross-sectional view showing yet another embodiment.

<Explanation of symbols for the main parts of the drawings>

10: Iron Golf Club Head

11: face part

12: soul part

13: weight material

13a: screw hole

14: hosel part

15: high specific gravity resin layer

16: FRP member

20: recess

21: inside

22 to 25: surrounding wall

30: rib

Claims (11)

In the iron type golf club head which has a head main body provided with a recessed part behind a face part, and the FRP member provided in the said recessed part, The concave portion has an inner surface along the face portion and a peripheral wall surface which is vertically lowered from the rear surface of the head body and connected to the inner surface, The FRP member is hollow in shape and overlaps the inner surface and the peripheral wall surface of the recess and at the same time closes the inlet portion of the recess, An iron-type golf club head, characterized in that all or most of the intersecting corners of the inner surface and the peripheral wall surface are curved surfaces. The iron type golf club head according to claim 1, wherein a radius of curvature of the curved surface is 1.5 to 80 mm. The iron type golf club head according to claim 1 or 2, wherein 80% or more of the entire length of the concave portion circumferential direction of the intersection corner is the curved surface. 4. The iron type golf club head according to any one of claims 1 to 3, wherein the FRP member is blow molded in the recess. The iron type golf club head according to claim 4, wherein the inlet portion of the concave portion has a shape in which the opening area is gradually reduced as it approaches the inlet portion of the head body. The iron type golf club head according to any one of claims 1 to 5, wherein a high specific gravity resin layer having a specific gravity higher than that of the head main body is provided on the inner surface of the recess. The iron type golf club head according to any one of claims 1 to 5, wherein a high specific gravity resin layer is provided at a lower portion and a rear portion in the recess. The iron type golf club head according to claim 6 or 7, wherein the high specific gravity resin layer is disposed between the head body and the FRP member. The iron type golf club head according to claim 6 or 7, wherein the high specific gravity resin layer is embedded in the FRP member. The iron golf club head according to any one of claims 6 to 9, wherein the high specific gravity resin layer is made of a resin containing a high specific gravity metal powder. The iron type golf club head according to any one of claims 1 to 10, wherein a weight member is fixedly attached to the sole portion of the head body.