JP2001054594A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club head having a high degree of freedom in centroid design. SOLUTION: This golf club head consists of a metallic head body 2 having a hollow part and a hosel member 3 mounted at a hosel rest part 4 disposed in this head body 2. The hosel rest part 4 is formed a small depth existing near the heel of a crown part 2b and a recess having a bottom 5. The hosel member 3 is composed by using a low-specific gravity material having the specific gravity smaller than the specific gravity of the head body 2 and has a fitting part 3a having the bottom plate 5 disposed in the hosel rest part 4. Either of the bottom 4a of the hosel rest part 4 or the bottom plate 5 of the hosel member 3 is provided with an engaging part 10 consisting of a projecting part 7 which projects toward the other and a recessed part 9 which is disposed at the other and fits the projecting part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head capable of improving the degree of freedom in designing the center of gravity of a head by reducing the weight of a hosel portion.

[0002]

BACKGROUND OF THE INVENTION Generally, in designing a golf club head, how to set the position of the center of gravity is a very important problem. In particular, the position of the center of gravity of the head is closely related to the performance of the head, such as the amount of back spin of the hit ball, the "return" of the head at impact, and the definition of a sweet spot area. For this reason, to improve the ease of hitting, for example, by lowering the height of the center of gravity of the head to make it easier to raise the ball, or by reducing the distance of the center of gravity of the head to improve the return of the head, the head is required to be improved in various ways. It is desirable that the degree of freedom in designing the position of the center of gravity is high.

Conventionally, as shown in FIG. 7, for example, as a metal golf club head a1 having a hollow portion M, a head body b and a shaft insertion for mounting the shaft d from the heel side of the head body b and mounting the shaft d. Generally, a hosel portion c having a hole e is integrally provided. The shaft d is usually fixed to the shaft insertion hole e using an adhesive, but if the bonding area between the two is small, there is a risk of separation at the time of swing or the like, so the bonding length is about 40 mm in the axial direction. Degree is needed.

[0004] The weight of a general hosel part c is about 12 g.
Assuming that the standard total weight of the head is 180 g, it accounts for about 6.5% of the total weight of the head. Therefore, there is a problem that the position of the center of gravity of the head is higher than the intended position by the weight of the hosel portion c, or the head is shifted toward the heel side. Also, since the total weight of the head is usually determined in advance, the hosel As the weight of the portion c increases, the head volume must be reduced.

As shown in FIG. 8, a head a2 without a hosel member protruding outward from the head body b has been proposed. In this case, a cylindrical portion f for inserting a shaft penetrating vertically through the inside of the head body b is formed, and the shaft d is fixed thereto. In the head a2, although the center of gravity can be suppressed from being increased by reducing the hosel member, the position of the center of gravity is more likely to shift to the heel side than the intended position by the weight of the cylindrical portion f.

A head a3 shown in FIG. 9 includes a head body b having a cylindrical portion f having a through hole h therein, and a hosel member g inserted into the cylindrical portion f from below and holding a shaft d. (See, for example, JP-A-5-96031)
No.). The hosel member g inserted into the through hole h of the cylindrical portion f is made of fiber reinforced plastic (FRP) or wood material. In the head a3, although the hosel member g is made of a lightweight material, the center of gravity of the head also tends to be closer to the heel because the tubular portion f needs to be formed inside the head b.

The head a4 shown in FIG. 10 comprises a head body b and a hosel portion c.
Is composed of an outer cylindrical portion c1 which is integral with the head body b and is made of the same metal material, and an inner cylindrical portion c2 made of fiber reinforced plastic, and a shaft d is fixed to the inner cylindrical portion c2. I have. In the head a4, since the outer cylindrical portion c1 made of the same metal material as the head body b is formed so as to protrude, the position of the center of gravity also tends to be higher.

As described above, the conventional heads a1 to a4
In any case, since the center of gravity of the head tends to be high or the heel tends to approach, there is room for further improvement in increasing the degree of freedom in designing the center of gravity of the head. The present invention has been devised in view of the above problems, and further enhances the degree of freedom in designing the center of gravity of the head based on reducing the weight of the hosel member and improving the shape of attachment to the head body. It is an object of the present invention to provide a golf club head.

[0009]

According to a first aspect of the present invention, there is provided a head body made of a metal having a hollow portion and having a hosel receiving portion, and a head body attached to the hosel receiving portion. A hosel member having a rising and a shaft insertion hole, wherein the head body has the hosel receiving portion formed as a recess having a small depth and a bottom portion located near the heel of the crown portion; The member has a fitting portion using a low specific gravity material having a specific gravity smaller than that of the head main body and having a bottom plate disposed on the hosel receiving portion, and the other is provided on one of the bottom portion of the hosel receiving portion or the bottom plate of the hosel member. And an engaging portion comprising a concave portion provided on the other side and fitted with the convex portion.

According to a second aspect of the present invention, the head body is formed without protruding from a hosel connecting surface in which an outer surface of the crown portion is smoothly extended toward the hosel receiving portion. The golf club head according to claim 1, wherein

According to a third aspect of the present invention, in the hosel receiving portion, a depth of the bottom portion from a hosel connecting surface in which an outer surface of the crown portion is smoothly extended toward the hosel receiving portion is 15 mm or less. 3. The golf club head according to claim 1, wherein the golf club head is interrupted and terminated in the hollow portion.

According to a fourth aspect of the present invention, the engaging portion includes at least two of the convex portions and the concave portions, and the concave amount of the concave portion is 1.5 to 10 mm. A golf club head according to any one of claims 1 to 3.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the engaging portion has the convex portion and the concave portion formed in a columnar shape, a prismatic shape, a cross shape, or an annular shape. Golf club head.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a golf club head (hereinafter, may be simply referred to as “head”) 1 of the present embodiment.
2, FIG. 2 is a plan view thereof, FIG. 3 (A) is a sectional view taken along the line AA of FIG. 2, and FIG. 3 (B) is a partially enlarged view thereof. In the drawing, a head 1 is made of a metal having a hollow portion M and a head body 2 provided with a hosel receiving portion 4.
And a hosel member 3 that rises from the head main body 2 by being attached to the hosel receiving portion 4.

The head body 2 includes a face portion 2a for hitting a ball, a crown portion 2b connected to an upper edge of the face portion 2a and forming an upper surface of the head, and a face portion 2a.
and a side extending from the toe T of the face portion 2 to the heel H of the face portion 2a through the back face from the toe T of the face portion 2 which connects the lower portion to the sole portion 2c and forms the head bottom surface. Part 2d,
In this example, a wood type is illustrated. Such a head main body 2 is preferably made of a metal material such as titanium, a titanium alloy, stainless steel, or an aluminum alloy, and is obtained by casting, forging or pressing such a material.
It can be constructed by welding the above parts. Although not shown, a balance adjusting member, a foamed resin, or the like can be disposed in the hollow portion M as necessary.

In the head body 2, the hosel is formed as a substantially circular concave portion in this embodiment having a small depth and a bottom portion 4a and located near the heel H of the crown portion 2b. A receiving part 4 is formed.
The hosel receiving portion 4 has a small depth and is formed as a depth that does not reach the sole portion 2c. More specifically, as shown in FIG. 3, for example, the depth D1 of the bottom portion 4a from the hosel connecting surface P in which the outer surface of the crown portion 2b is smoothly extended toward the hosel receiving portion 4 is 15 mm or less. , More preferably 10 mm or less, still more preferably 5 to 10 mm
It is desirable that As a result, the hosel receiving portion 4 of the present example is exemplified as one in which the hollow portion M is interrupted and terminated in the hollow portion M without reaching the sole portion 2d.
For this reason, extreme weight distribution to the heel side can be suppressed.

The head body 2 is formed without protruding outward from the hosel connecting surface P. In this case, the metal material portion forming the head main body 2 can be prevented from being located at a high place of the head 1,
This is particularly useful for preventing the position of the center of gravity of the head 1 from shifting to a higher place.

Next, the hosel member 3 is made of a material having a lower specific gravity than the head body 2. The low specific gravity material is preferably a nonmetallic material, such as plastic, fiber reinforced plastic (FRP), or wood. Further, as the fiber reinforced plastic, for example, one or more of carbon fiber, boron fiber, glass fiber and the like may be blended to form a combination reinforced plastic. Such fiber reinforced plastics have a lower specific gravity (eg, about 1.
It is particularly preferable in that it can have the strength required for the hosel portion as well as the strength of the hosel portion.

As shown in FIG. 4, the hosel member 3 has a fitting portion 3a having a bottom plate 5 disposed on a hosel receiving portion 4 provided on the head body 2 and a hose 3 when the hosel member 3 is attached to the head body 2. And a rising portion 3b rising from the head main body 2. The rising portion 3b
When the crown part 2 is attached to the hosel receiving part 4,
The shape and the like of the hem portion are finished so as to smoothly connect with b. The rising portion 3b is formed with a shaft insertion hole 6 in which the shaft S is mounted.
, The tip of the shaft S is inserted and fixed with, for example, an adhesive. The fitting portion includes the rising portion 3b.
And formed in a substantially columnar shape with a small height that fits into the hosel receiving portion.

The head 1 according to the present embodiment is integrally formed by fitting a fitting portion 3a of the hosel member 3 to a hosel receiving portion 4 of the head body 2 with a fitting adhesive or the like. In such a head 1, since the hosel member 3 is made of a material having a low specific gravity and the hosel receiving portion 4 is formed as a concave portion having a small depth, the weight of the hosel portion can be significantly reduced, and the conventional head 1 It can be effectively prevented that the position of the center of gravity is set high as described above and that the heel H is shifted toward the heel. Therefore, by appropriately allocating the weight of the head 1, the position of the center of gravity can be arbitrarily set, and the degree of freedom in design can be further improved. In addition, since the weight of the hosel member 3 is reduced, the weight of the hosel member 3 can be transferred to the head main body 2, so that the center of gravity can be freely designed and the head volume can be increased.

The head 1 of the present embodiment is provided on one of the bottom 4a of the hosel receiving portion 4 or the bottom plate 5 of the hosel member 3 and protrudes toward the other, and is provided on the other. There is provided an engaging portion 10 comprising a concave portion 9 into which the convex portion 7 is fitted. In the present example, the concave portion 9 is formed in the bottom portion 4a of the hosel receiving portion 4 and the convex portion 7 is provided in the bottom plate 5 of the fitting portion 3a of the hosel member 3. For this reason, the head body 2 and the hosel member 3 can be reliably joined to each other, so that the head 1 having sufficient joining strength can be provided, and positioning at the time of attachment can be facilitated.

It is preferable that the engaging portion 10 includes two or more convex portions 7 and concave portions 9 respectively. Thereby, the joining strength between the hosel receiving portion 4 and the hosel member 3 can be further increased. Also, as shown in FIG.
The recess amount D2 of the recess 9 from the bottom 4a is, for example, 1.5 to 10.0 mm, and more preferably 1.5 to 5.0 m.
m, more preferably 2.0 to 5.0 mm. If the dent amount D2 is less than 1.5 mm, the bonding strength tends to decrease relatively. If the dent amount D2 exceeds 10.0 mm, the center of gravity of the head 1 tends to be higher or the heel tends to be closer.

Also, the convex portion 7 forming such an engaging portion 10
In this example, the concave portion 9 is formed in the shape of three cylinders. Alternatively, the concave portion 9 may be formed in a prismatic shape. Alternatively, as shown in FIG. Further, as shown in FIG. 5B, an appropriate shape such as a cross shape or a combination thereof can be adopted. Furthermore, in addition to forming the convex portion 7 and the concave portion 9 on members opposite to those illustrated, the convex portion 7 and the concave portion 9 may be provided on both the bottom 4a of the hosel receiving portion 4 and the bottom plate 5 of the hosel member 3.

[0024]

EXAMPLES Wood-type golf club heads (examples) shown in FIGS. 1 to 3 were prototyped, and the height of the center of gravity and the distance of the center of gravity were measured. For comparison, a wood type golf club head (conventional example) having substantially the same head volume as the structure shown in FIG. 7 was also prototyped, and the height of the center of gravity and the distance of the center of gravity were measured in the same manner. In both the embodiment and the conventional example, the total weight of the head was 182
g, the head volume was unified to 340 cc. In the head of the example, a titanium alloy was used for the head body, and carbon fiber reinforced plastic was used for the hosel member.
Further, in the conventional example, the entire head is formed from the titanium alloy.

The height of the center of gravity of the head is measured as a vertical distance A from the horizontal plane to the center of gravity G as shown in FIG. 6A, and the center of gravity is measured as shown in FIGS. 6A and 6B. ,
The point of intersection at which the normal drawn perpendicular to the face from the center of gravity G intersects the face is defined as G ', and the shortest distance B between this intersection G' and the center line of the shaft was measured. Table 1 shows the test results.

[0026]

[Table 1]

As is clear from the test results, it can be confirmed that the head of the embodiment has a lower center of gravity (lower center of gravity) and a shorter center of gravity than the conventional example. Regarding such a difference, the weight reduction of the hosel portion was achieved in the embodiment, so that the reduced weight could be distributed to the sole portion (thickness was set to 3 mm). This is probably because the weight of the sole portion was limited to 2 mm because of the inability to distribute the weight.

[0028]

As described above, according to the first aspect of the present invention, the hosel member is made of a material having a low specific gravity, and the hosel receiving portion is formed as a concave portion having a small depth.
The weight of the hosel can be significantly reduced, and the position of the center of gravity can be set high, unlike the conventional head, and the heel can be effectively prevented from being shifted toward the heel. Therefore, for example, by arranging the weight reduced by the hosel member on the sole portion of the head or the like, the center of gravity can be easily reduced, and the degree of freedom in designing the center of gravity of the head can be further improved. Further, since the weight of the hosel member is reduced, the weight can be transferred to the head main body, and the head volume can be increased.

The head comprises a convex portion provided on one of the bottom portion of the hosel receiving portion or the bottom plate of the hosel member and protruding toward the other, and a concave portion provided on the other side for fitting the convex portion. With the engagement part, the head body and hosel member can be securely joined even with a hosel receiving part with a small depth, and a head with sufficient joint strength is provided. Matching can also be facilitated.

According to the second aspect of the present invention, the head body is formed without protruding outward from a hosel connecting surface in which the outer surface of the crown portion smoothly extends toward the hosel receiving portion. Thereby, it is possible to prevent the metal material portion forming the head main body from being located at a high place of the head. Therefore, it is particularly useful to prevent the position of the center of gravity of the head from increasing.

According to the third aspect of the present invention, the hosel receiving portion is interrupted and terminated in the hollow portion by setting the depth of the bottom portion from the hosel connecting surface to 15 mm or less. The extreme shift of the center of gravity to the side can be suppressed.

Further, in the invention according to claims 4 and 5,
The connection between the head body and the hosel member is made stronger, and the durability and the like can be further improved.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating an example of a golf club head according to an embodiment.

FIG. 2 is a plan view thereof.

3A is a sectional view taken along line AA of FIG. 2, and FIG. 3B is a partially enlarged view thereof.

FIG. 4 is a perspective view illustrating an embodiment of a hosel member.

FIGS. 5A and 5B are perspective views showing another embodiment of a hosel member.

FIG. 6A is a side view of the head illustrating the height of the center of gravity of the head, and FIG. 6B is a front view illustrating the distance of the center of gravity of the head.

FIG. 7 is a cross-sectional view illustrating a conventional head.

FIG. 8 is a cross-sectional view illustrating a conventional head.

FIG. 9 is a cross-sectional view illustrating a conventional head.

FIG. 10 is a cross-sectional view illustrating a conventional head.

[Explanation of symbols]

 Reference Signs List 1 head 2 head main body 3 hosel member 3a fitting portion 3b rising portion 4 hosel receiving portion 4a bottom of hosel receiving portion 5 bottom plate 6 shaft insertion hole 7 convex portion 9 concave portion 10 engaging portion

Claims (5)

[Claims] 1. A head body made of a metal having a hollow portion and having a hosel receiving portion, and a hosel member rising from the head body and being provided with a shaft insertion hole by being attached to the hosel receiving portion, The head body has the hosel receiving portion formed as a concave portion having a small depth and a bottom portion located near the heel of the crown portion, and the hosel member is made of a low specific gravity material having a lower specific gravity than the head body. And a fitting portion having a bottom plate disposed on the hosel receiving portion, a convex portion protruding toward the other at one of the bottom portion of the hosel receiving portion or the bottom plate of the hosel member, and the convex portion provided at the other side. A golf club head comprising an engaging portion comprising a concave portion for fitting the portion. 2. The head body according to claim 1, wherein the head body is formed without protruding from a hosel connecting surface in which an outer surface of the crown portion smoothly extends toward the hosel receiving portion. Golf club head. 3. The hosel receiving portion has an inner surface in which the crown portion has a depth of 15 mm or less from a hosel connecting surface in which an outer surface of the crown portion is smoothly extended toward the hosel receiving portion. The golf club head according to claim 1, wherein the golf club head is terminated at a stop. 4. The method according to claim 1, wherein each of the engaging portions includes two or more of the convex portions and the concave portions, and a concave amount of the concave portions is 1.5 to 10 mm.
The golf club head according to any one of the above. 5. The golf club head according to claim 1, wherein said engaging portion has said convex portion and concave portion formed in a columnar shape, a prismatic shape, a cross shape, or an annular shape.