JP2004159854A - Metal golf club head and golf club - Google Patents

Abstract

A metal golf club head capable of easily positioning a head part while adjusting the position of the center of gravity of the head by making the specific gravity of the head part attached to the head main body part smaller than the specific gravity of the head main body part, and the head Provide a golf club equipped.
A golf club includes a golf club head, a shaft, and a grip. The golf club head is made of a hollow metal and is formed of a head main body 2 having an opening 8 and a material having a specific gravity smaller than that of the head main body 2 attached to the head main body 2 so as to close the opening 8. A crown part 3a. Then, positioning ribs for the crown part 3a are provided on the surface of the crown part 3a that constitutes a part of the inner surface of the head main body 2.
[Selection] Figure 2

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal golf club head and a golf club, and more particularly, to a metal golf club head in which a head part constituting a part of the head and a head main body are joined, and a golf club including the head.
[0002]
[Prior art]
In general, in a wood type golf club head, the head mass is uniquely determined from the club length, balance, shaft mass, and grip mass. On the other hand, it is desired to increase the size of the wood type golf club head in order to increase the moment of inertia of the head. If the moment of inertia of the head increases, even if a golf ball is hit at a position deviated from the sweet spot at the time of hitting, rotational motion around the center of gravity of the head can be reduced, so even a general amateur golfer can fly. This is because the distance reduction can be suppressed and the directionality of the hit ball can be stabilized.
[0003]
As described above, the head mass is almost determined by other factors such as the club length, so in order to produce a large wood type golf club head, a metal having a low specific gravity and high strength should be used as a head material. Becomes effective. Therefore, in recent years, in wood type golf clubs, it has become mainstream to use a metal having a low specific gravity and high strength, such as titanium or a titanium alloy, as a head material.
[0004]
However, in order to increase the size of the wood-type golf club head in order to increase the moment of inertia of the head as much as possible, if the thin-wall design is made to the limit, the molten metal flow in casting becomes worse in the lost wax manufacturing method, resulting in a casting defect. As a result, a number of drawbacks such as a decrease in yield and a difficulty in securing a mass for controlling the center of gravity of the head have come to be seen.
[0005]
Therefore, in order to increase the moment of inertia of the head and provide a golf club head with excellent directionality, for example, Japanese Patent No. 2949691 is characterized in that the material forming the crown portion is formed from a material having the smallest specific gravity. A golf club head is disclosed.
[0006]
On the other hand, in order to improve the hitting sound of the golf club head and to increase the rigidity of the head at the time of hitting, a rib is provided on the inner surface of the crown part or the sole part. For example, in Japanese Patent Application Laid-Open No. 2002-126136, a metal golf club head having a hollow portion, which protrudes from the inner surface of the crown portion or the inner surface of the sole portion facing the hollow portion, and has a face portion, A golf club head characterized in that a plurality of linear protrusions extending in a substantially orthogonal direction is formed.
[0007]
[Patent Document 1]
Japanese Patent No. 2949691 [0008]
[Patent Document 2]
Japanese Patent Laid-Open No. 2002-126136
[Problems to be solved by the invention]
However, in the invention described in Japanese Patent No. 2949691, it is described that the crown part is bonded to the main body part, but there is no description about the positioning method of the crown part. For this reason, there is a problem in that the positioning at the time of joining the crown part to the head main body cannot be easily performed, and the workability at the time of manufacturing the head is lowered. In addition, when variations occur in the outer peripheral shape of the crown part or the opening shape of the head main body, there may be a problem that the crown part cannot be attached to the head main body.
[0010]
Japanese Patent Laid-Open No. 2002-126136 also does not describe a crown part positioning method at all. In the invention described in the publication, linear protrusions are provided to improve the hitting sound. However, the publication does not describe that the crown part is a separate part from the head body part in the first place. In addition, the above-described linear protrusion is provided only for improving the hitting sound, and the linear protrusion cannot be used for positioning the crown part.
[0011]
The present invention has been made to solve the above-described problems. An object of the present invention is to provide a metal golf club head capable of easily positioning a head part while adjusting the gravity center position of the head by making the specific gravity of the head part attached to the head main body part smaller than the specific gravity of the head main body part. An object of the present invention is to provide a golf club having the head.
[0012]
[Means for Solving the Problems]
The golf club head according to the present invention is a hollow metal golf club head, which is attached to the head body so as to close the opening, and has a specific gravity smaller than that of the head body. A head part formed of a material. Then, positioning ribs (convex parts) of the head part are provided on the surface of the head part that constitutes a part of the inner surface of the head main body.
[0013]
Thus, the center of gravity of the head can be adjusted by forming the head part with a material having a specific gravity smaller than that of the head main body. Further, by providing positioning ribs on the head parts, the head parts can be positioned easily.
[0014]
The head main body preferably has a receiving part for receiving head parts. At this time, the end surface of the positioning rib is located on the inner side of the head part from the outer periphery of the head part, and the length from the outer periphery of the head part to the end surface of the positioning rib is directed inward of the opening. It is preferable that the length is not more than the protruding length of the receiving portion.
[0015]
In addition, the length from the outer periphery of the head part to the end face of the positioning rib is made smaller than the protruding length of the receiving part in the direction toward the inside of the opening, and the head is between the head part and the head main body. A gap surrounding the part may be provided.
[0016]
The length from the outer periphery of the head part to the end face of the positioning rib is preferably 2 mm or more and 8 mm or less. More preferably, it is 3.5 mm or more and 6.5 mm or less.
[0017]
A golf club according to the present invention includes the above-described metal golf club head. Therefore, the golf club is provided with a high-performance head in which the position of the center of gravity is adjusted and the head parts are well accommodated.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a golf club head and a golf club according to an embodiment of the present invention will be described. The present invention is useful for wood type golf club heads and wood type golf clubs, but is also applicable to iron type golf club heads and iron type golf clubs.
[0019]
In the following description, a case where the present invention is applied to a wood type golf club head and a wood type golf club will be described.
[0020]
The golf club in the present embodiment includes a golf club head, a shaft, and a grip. The golf club head is a hollow metal golf club head, and has a head main body portion and a head part. Known shafts and grips are used.
[0021]
The head body portion in the golf club head of the present embodiment has a crown portion, a sole portion, a side portion, and a face portion. For example, the crown portion has an opening. The head part is attached to the head main body so as to close the opening.
[0022]
The head body is made of, for example, pure titanium, titanium alloy, duralumin, stainless steel or the like. As a method for forming the head main body, a method in which parts formed by pressing a metal plate are integrally formed by welding or a method in which the parts are integrally formed by lost wax precision casting can be used.
[0023]
The face portion is made of a high-strength material such as titanium alloy, duralumin, or stainless steel, and can be formed, for example, by joining a face member that is a separate member from the head main body portion to the head main body portion.
[0024]
When joining the face member to the head main body, for example, a face opening is provided in the head main body, and the face member is welded to the head main body so as to close the face opening. At this time, a face opening part may be provided in a part of the face part, or a face opening part covering the entire face part may be provided. Examples of the method for forming the face portion or the face member include a forming method by pressing a metal plate and a forming method by forging a round bar.
[0025]
The head part is formed of a material having a specific gravity smaller than that of the head main body. For example, a material having a small specific gravity such as magnesium or a magnesium alloy can be used. Thereby, the center-of-gravity position of the head can be adjusted.
[0026]
As head parts, crown parts that close the crown opening provided in the crown part, crown / side parts that close the crown / side opening provided from the crown part to the side part, and provided from the sole part to the side part Examples include sole / side parts that close the sole / side opening. Further, the crown part may be provided on any of the center part of the crown part, the face part side, the toe part side, the heel part side, and the back part side.
[0027]
When the crown parts are attached to the head body, the center of gravity of the head can be lowered, and when the crown and side parts are attached to the head body, the center of gravity of the head is lowered and the heel part side is lowered. The center of gravity can also be shifted to the side of the toe and the toe, and when the sole and side parts are attached to the head body, the position of the center of gravity is also located on the heel and toe while slightly raising the center of gravity of the head. Can be shifted. Thus, the center of gravity position can be shifted not only in one direction but also in a plurality of directions, and as a result, the center of gravity position can be shifted to an arbitrary position in the three-dimensional space.
[0028]
The head main body is provided with a receiving portion for receiving head parts such as crown parts. The receiving portion can be formed, for example, by bending an end portion located around the opening of the head main body to the inside of the head main body and providing a step portion around the opening.
[0029]
And the peripheral part of a head part is mounted on this receiving part, and the receiving part of a head main-body part and the peripheral part of a head part are joined using an adhesive agent etc. At this time, positioning ribs (convex parts) of the head part are provided on the surface of the head part that constitutes a part of the inner surface of the head main body. Thereby, the positioning of the head parts can be performed easily and with high accuracy.
[0030]
Further, by arranging the receiving portion on the inner side of the head main body, the upper surface of the head part and the outer surface of the head main body located around the head part can be substantially flush with each other. Therefore, it is possible to avoid an impact from being applied to the peripheral part of the head part, and to prevent the head part from falling off the head main body part.
[0031]
In addition, the end face of the positioning rib (typically the end face in the longitudinal direction) is arranged on the inner side of the head part from the outer periphery of the head part, and the length from the outer periphery of the head part to the end face of the positioning rib is set. It is preferable that the length is equal to or shorter than the protruding length of the receiving portion in the direction toward the inside of the opening of the head main body. Thereby, the peripheral part of the head part can be placed on the receiving part while contacting the inner peripheral surface of the receiving part with the end face of the positioning rib.
[0032]
Further, the length from the outer periphery of the head part to the end face of the positioning rib is made, for example, about 1 mm to 2 mm shorter than the protruding length of the receiving part in the direction toward the inside of the opening, In between, a gap surrounding the head part may be positively provided.
[0033]
The width of the gap is secured to be about 1 mm to 2 mm or less, for example, so that variations in the outer shape of the head parts can be absorbed. As a result, even if there is some variation in the outer shape of the head part, the head part can be reliably stored in the recess of the head main body located around the opening.
[0034]
The length from the outer periphery of the head part to the end face of the positioning rib is preferably 2 mm or more and 8 mm or less. More preferably, it is 3.5 mm or more and 6.5 mm or less. By securing such a length, it is possible to secure a bonding area between the head part and the receiving portion, and a desired bonding strength can be obtained.
[0035]
The number of positioning ribs may be singular but is preferably plural. In the case where a plurality of positioning ribs are provided, the positioning ribs may be arranged apart from each other, or may be crossed. For example, two or three positioning ribs may be provided in parallel, or positioning ribs may be provided so as to intersect in a cross shape.
[0036]
Further, the form of the positioning rib can be arbitrarily selected and may be linear or curved. Further, the positioning rib may be formed integrally with the head part by casting or the like, but may be provided by attaching another member to the head part.
[0037]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0038]
(Example 1)
FIG. 1 shows a wood type golf club head 1 in Embodiment 1 of the present invention. The wood type golf club in the present embodiment includes the golf club head 1 shown in FIG. 1, a shaft and a grip. Since well-known shafts and grips can be used, their illustration and description are omitted.
[0039]
As shown in FIG. 1, the golf club head 1 in the present embodiment includes a head main body 2 and a crown part 3a as a head part. The head main body 2 is made of a titanium alloy and includes a crown portion 3, a face portion 4, a side portion 5, and a sole portion 6. The crown part 3a is made of magnesium.
[0040]
2A and 2B are perspective views of the crown part 3a and the head main body 2 in the golf club head 1 shown in FIG. As shown in FIG. 2A, the crown part 3a constitutes a part of the crown portion 3 and has an outer surface constituted by a curved surface having a predetermined curvature.
[0041]
As shown in FIG. 2B, the head main body 2 has an opening 8 at the center of the crown 3 and a receiving portion 9 around the opening 8. The receiving portion 9 is formed in a concave shape such that the end portion of the head main body portion 2 positioned around the opening 8 is recessed about 1 mm toward the inner side of the head main body portion 2.
[0042]
FIG. 3 shows a cross-sectional view of the golf club head 1 in the first embodiment. As shown in FIG. 3, the peripheral part of the crown part 3a is adhered on the receiving part 9, and the opening part 8 is closed with the crown part 3a.
[0043]
As shown in FIG. 4, three positioning ribs 11 are provided on the back surface of the crown part 3a. The crown part 3a can be molded by casting, and positioning ribs 11 are also formed during the molding. In the example of FIG. 4, two positioning ribs 11 extend substantially in parallel in the horizontal direction, and one positioning rib 11 extends in the vertical direction so as to intersect with these at right angles.
[0044]
Further, each positioning rib 11 is formed so that the end surface 12 of each positioning rib 11 is positioned about 5 mm inside the outer periphery of the crown part 3a. Using the end face 12 of the positioning rib 11, the crown part 3a can be positioned. Further, the peripheral portion of the crown part 3a can be placed on the receiving portion 9 as shown in FIG. 3 while the end surface 12 of the positioning rib 11 is in contact with or close to the inner peripheral surface of the receiving portion 9. In this state, the receiving part 9 and the crown part 3a can be bonded.
[0045]
At this time, the length L2 from the outer periphery of the crown part 3a to the end face 12 of the positioning rib 11 is set to be equal to or shorter than the protruding length L1 of the receiving portion 9 in the direction toward the inside of the opening 8. Specifically, the length L2 is about 5 mm while the length L1 is about 6 mm. Thereby, the gap | interval part 7 can be formed in the circumference | surroundings of the crown part 3a as shown in FIG. 1 and FIG.
[0046]
In the example of FIG. 3, the face portion 4 is formed by providing the face portion 4 with the opening 10 and attaching the face part 13 so as to close the opening 10. The opening 10 in the face part may be provided in the center part of the face part as shown in FIG. 12, or the opening part 10 may be provided over almost the entire area of the face part as shown in FIG. In the case of FIG. 13, the crown 3 and the face part 13 may be welded in a state where a notch is provided in the crown 3, a flange is provided at the end of the face part 13, and the flange is accommodated in the notch.
[0047]
(Example 2)
Next, Embodiment 2 of the present invention and its modification will be described with reference to FIGS. In the second embodiment, the shape and position of the opening 8 provided in the head main body 2 will be described.
[0048]
As shown in FIG. 5, the opening 8 may be provided at the center of the crown 3, or the opening 8 may be provided on the toe side of the crown 3 as shown in FIG. The opening 8 may be provided on the heel side of the crown 3, or the opening 8 may be provided on the back side of the crown 3 as shown in FIG. 8.
[0049]
In the case of FIG. 5, the center of gravity of the golf club head 1 can be lowered most effectively, and in the case of FIG. 6, the position of the center of gravity moves toward the heel portion while reducing the center of gravity of the golf club head 1. In the case of FIG. 7, the position of the center of gravity can be shifted to the toe side while reducing the center of gravity of the golf club head 1, and in the case of FIG. The center of gravity position can be shifted to the face part 4 side while achieving the center of gravity.
[0050]
(Example 3)
Next, Embodiment 3 of the present invention and its modification will be described with reference to FIGS. In the above-described second embodiment, the opening 8 is provided only in the crown 3, but the opening 8 may be provided from a part of the golf club head 1 to a part adjacent to the part.
[0051]
In the example shown in FIGS. 9 and 10, the opening 8 is provided from the crown portion 3 to the side portion 5. In the example of FIG. 11, an opening 8 is provided from the sole portion 6 to the side portion 5. In any case, the position of the center of gravity of the golf club head 1 can be easily shifted to a desired position. In addition, since the positioning accuracy has been improved, even when the opening 8 extends over a plurality of surfaces, it is possible to maintain a good head shape with little shape shift.
[0052]
Although the embodiments and examples of the present invention have been described above, the embodiments and examples disclosed this time should be considered as illustrative in all points and not restrictive. . The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.
[0053]
【The invention's effect】
According to the present invention, the center of gravity of the head can be adjusted simply by joining a head part having a specific gravity smaller than that of the head body to the head body, so that the center of gravity of the head can be easily adjusted. Further, since the positioning rib is provided on the head part, the head part can be easily positioned when the head part is joined to the head main body. Therefore, it is possible to obtain a golf club head and a golf club including the head that can easily position the head parts while adjusting the position of the center of gravity of the head.
[Brief description of the drawings]
FIG. 1 is a perspective view of a golf club head in Example 1 of the present invention.
2A is a perspective view of a crown part in the golf club head of Example 1, and FIG. 2B is a perspective view of a head main body part in the golf club head of Example 1. FIG.
3 is a cross-sectional view of the golf club head of Example 1. FIG.
4 is a rear view of a crown part in the golf club head of Example 1. FIG.
FIG. 5 is a plan view of a head main body portion in a golf club head according to a second embodiment of the present invention.
6 is a plan view of a head main body portion in a golf club head according to a modified example of Embodiment 2. FIG.
7 is a plan view of a head main body portion in a golf club head of another modified example of Embodiment 2. FIG.
FIG. 8 is a plan view of a head main body portion in a golf club head of still another modified example of the second embodiment.
FIG. 9 is a perspective view of a head main body portion in a golf club head according to a third embodiment of the present invention.
10 is a perspective view of a head main body portion in a golf club head according to a modified example of Embodiment 3. FIG.
11 is a perspective view of a head main body portion in a golf club head according to another modification of Example 3. FIG.
FIG. 12 is a perspective view of the head main body showing an example of the shape of the opening in the face.
FIG. 13 is a perspective view of the head main body showing another example of the shape of the opening in the face.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Golf club head, 2 Head main-body part, 3 Crown part, 3a Crown part, 4 Face part, 5 Side part, 6 Sole part, 7 Gap part, 8, 10 Opening part, 9 Receiving part, 11 Positioning rib, 12 End face, 13 face parts.

Claims (5)

A hollow metal golf club head,
A head body (2) having an opening (8);
A head part (3a) that is attached to the head main body (2) so as to close the opening (8) and is formed of a material having a specific gravity smaller than that of the head main body (2);
A metal golf club head, wherein a positioning rib (11) of the head part (3a) is provided on a surface of the head part (3a) on a side constituting a part of an inner surface of the head main body (2). The head body part (2) has a receiving part (9) for receiving the head parts (3a),
The end face (12) of the positioning rib (11) is located on the inner side of the head part (3a) than the outer periphery of the head part (3a),
The length (L2) from the outer periphery of the head part (3a) to the end face (12) of the positioning rib (11) is the direction of the receiving portion (9) in the direction toward the inside of the opening (8). The metal golf club head according to claim 1, wherein the metal golf club head has a protrusion length (L1) or less. The length (L2) from the outer periphery of the head part (3a) to the end surface (12) of the positioning rib (11) is set to be inward of the opening (8). Smaller than the protruding length (L1),
The metal golf club head according to claim 2, wherein a gap (7) surrounding the head part (3a) is provided between the head part (3a) and the head main body (2). The length (L2) from the outer periphery of the head part (3a) to the end face (12) of the positioning rib (11) is 2 mm or more and 8 mm or less, according to any one of claims 1 to 3. Metal golf club head. A golf club comprising the metal golf club head according to any one of claims 1 to 4.

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