JP3464165B2 - Wood-type golf club head and golf club using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood type golf club head capable of stabilizing directionality and a golf club using the same.

[0002]

2. Description of the Related Art In recent years, the volume of wood-type golf club heads has tended to increase with the improvement of manufacturing technology. In particular, the use of high-strength, low-specific-gravity materials such as titanium, titanium alloys, and aluminum alloys. , A driver or the like can manufacture a golf club head having a head volume of 300 cc or more. With such an increase in the size of the head, the length of the shaft tends to increase. However, in such a golf club, as shown in FIG. 5, the center of gravity distance L, which is the shortest distance from the center line CL of the shaft a to the center of gravity G of the head b, tends to increase as the head volume increases.

When the distance L of the center of gravity of the head b increases, the "return" of the head b tends to deteriorate when hitting a ball, and this tendency is particularly remarkable in combination with a long shaft. Become. Here, in a golf club with a poor head return, as shown in FIG.
In many cases, the face surface c, which is the surface for hitting the ball, cannot fully return to the state at the time of addressing (normally, the state where the face surface c is at a right angle to the target flight line). It is easy to hit B. Therefore, in the case of a right-handed golfer, the directionality is not stable because the hit ball is launched to the right of the target flight line, and the ball B is likely to be subjected to slice rotation to bend the ball B to the right. There is a problem called leprosy.

Conventionally, in order to solve such a problem, as shown in FIG. 7, the face angle α of the face surface c is preliminarily set on the hook side (+ side in the drawing) of the vertical plane N passing through the shaft center line CL. ) And setting the face angle α to be large, a method has been adopted in which the opening of the face surface c is reduced even if the face surface c is not sufficiently returned. The face angle α is the lie angle adjusted to the specified value,
The shaft a is fixed in a vertical plane with respect to the ground, and the toe i and heel j of the face surface c when the sole surface is attached to the ground
The angle of the direction.

[0005]

However, in the head b having the large face angle α as described above, as is apparent from the state of FIG. 7 in which the shaft a is positioned on the vertical plane N, the face surface c is Because it will face to the left,
There is also an adverse effect that it is difficult to adjust the head b in the target direction and it is difficult to hold.

The present invention has been made in view of the above problems, and in a wood type golf club head having a head volume of 300 cc or more, from the center line of the shaft mounting portion of the head to the center of gravity of the head. Based on the fact that the center-of-gravity distance, which is the shortest distance, is set to 31 mm or less, a wood type golf club head capable of improving the return of the head, preventing slicing, and stabilizing the directionality of a hit ball, and a golf club using the same. It is intended to be provided.

As prior art, JP-A-6-9895
No. 4 publication is proposed. This suggests that the center of gravity of the metal head is set on the shaft side, but this is to suppress the "hook phenomenon due to the head cover movement", and the problem is completely different from the present invention. ,
Further, there is no specific suggestion about the center of gravity distance and the head volume.

[0008]

Means for Solving the Problems] According to one aspect of the present invention, gauze and the head body, the shaft is inserted
A wood type golf club head having a shaft mounting portion formed of a shaft having a shaft mounting hole , the head volume being 300 cc or more, and the shaft center of the shaft.
It is characterized in that the center-of-gravity distance L, which is the shortest distance from the center line of the shaft mounting portion coinciding with the line to the center of gravity of the head, is 25 to 31 mm .

The head body has a crown portion which is connected to an upper edge of a face portion for hitting a ball and serves as an upper surface of the head, a sole portion which is connected to a lower edge of the face portion and serves as a lower surface of the head, and the crown portion and the sole portion. And includes a side portion extending from the toe of the face portion through the back face to the heel of the face portion,
It is also preferable to gradually increase the thickness of the crown portion, the sole portion, or the side portion from the toe side toward the heel side.

Further it is possible to provide a golf club by mounting the shaft into the shaft mounting portion of such a wood type golf club head.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 by taking a wood golf club of a driver (# 1) as an example. FIG. 1 shows a partial front view of a wood type golf club 1 of the present embodiment, and FIG. 2 shows a sectional view of a head. The wood-type golf club of the present embodiment (hereinafter sometimes simply referred to as "club") 1
Includes a wood type golf club head (hereinafter, may be simply referred to as “head”) 2 and a shaft 3,
A grip (not shown) is attached to one end of the shaft 3, for example.

The head 2 is a head body 2a in this example.
And a shaft mounting portion 2b to which the shaft 3 is mounted, and the head volume is 300 cc or more.
As described above, by configuring the head with a large-sized head having a volume of 300 cc or more, it is possible to feel a sense of security when holding the head and to increase the meet rate.

The head body 2a is connected to the upper edge of the face portion 4 having a face surface 4a which is a surface for hitting a ball and forms the upper surface of the head. The crown portion 5 is connected to the lower edge of the face portion 4 and the lower surface of the head. And the sole portion 6 forming
It includes a side portion 7 connecting the crown portion 5 and the sole portion 6 and extending from the toe portion t through the back face to the heel portion h. The shaft mounting portion 2b is, in this example, a shaft-shaped body that is formed to project at a position where the face portion 4, the crown portion 5, and the side portion 7 intersect on the heel portion h side.
A shaft mounting hole 9 into which the shaft 3 is inserted and which can be fixed with, for example, an adhesive is illustrated.

The head volume is the entire volume surrounded by the outer surface of the head 2 (including the shaft mounting portion 2b), and is actually measured by the following method. First, as shown in FIG. 3, a container 10 in which the head 2 is sufficiently contained is filled with water having a specific gravity of ρg / cc, and the whole container 10 is placed on an electronic balance 11 and the whole weight is measured. After that, the head 2 of the club 1 suspended in the air by a suspender 12 such as wire.
The shaft mounting portion 2b up to the upper end is submerged in the container 10. At this time, the water surface of the container 10 rises from H1 to H2 according to the volume of the head 2. And this head 2
Since the total weight increases by the amount of water displaced by,
The increased weight dW is measured by the electronic balance 11. Then, this increased weight dW is divided by the specific gravity ρ of water (dW / ρ)
By doing so, the volume of the head 2 can be measured. If the head volume is too large, the weight of the head 2 increases and it becomes difficult to swing. Therefore, it is particularly preferable to set the head volume to about 300 to 350 cc, more preferably about 300 to 320 cc.

Such a head 2 is made of, for example, a titanium alloy (for example, 6-4 titanium, Ti-6% Al-4%).
V alloy), and other than this, titanium alloys having other compositions , pure titanium, aluminum alloys, etc.
In addition to high-strength and low-specific-gravity materials, various other alloys and composite materials, and various materials such as forming the face portion 4 and the sole portion 6 with a metal material different from other portions are used. be able to.

In this embodiment, as shown in FIGS. 1 and 2, the thickness of the crown portion 5, the sole portion 6 or the side portion 7 is gradually increased from the toe portion t side toward the heel portion h side. The head 2 reduces the center-of-gravity distance L, which is the shortest distance from the center line C of the shaft mounting portion 2b (which coincides with the center line CL of the shaft) to the center of gravity G of the head 2, to 31 mm or less. The set items are illustrated. In the conventional head, when the head volume is 300 cc or more, the center-of-gravity distance is larger than 31 mm, for example, 35 mm.
Many are set to mm or more.

As described above, the head 2 of the present embodiment has a large volume of 300 cc or more, which provides a sense of security when it is held, and at the same time, despite the large head,
By setting the center-of-gravity distance L to a small value of 31 mm or less, the return of the head 2 can be improved when hitting a ball, and the face surface 4a can easily return to the addressed state. Therefore, it is possible to preferably prevent the ball from hitting with the face surface 4a open, and it is useful for suppressing slicing and stabilizing the directionality of the hit ball.

Further, since the return of the head 2 is improved, it is possible to hit a so-called draw rotation (a rotation in the hook direction, but a degree of the hook is small) which is excellent in the flight distance, thereby stabilizing the directionality. It is effective in achieving an increase in flight distance while maintaining it. Furthermore, head 2
By improving the return of the club, it is not necessary to previously set the face angle α of the face surface 4a to a large angle on the hook side as in the conventional case, and therefore, the ease of holding the club 1 can be significantly improved. become. From this perspective,
The face angle α is preferably set to +2 to + 6 °, more preferably +2 to + 4 °.

Further, in the club 1 of this embodiment, the head 2
It is possible to further lengthen the shaft 3 and the like because it is easy to return, and it is more effective to increase the head speed and the flight distance. For example, the club 1 of this example has a total length of 45
It is possible to easily realize lengthening of inches or more, more preferably 46 inches or more, and further preferably 46 to 48 inches.

The center-of-gravity distance L of such a head 2 is shown in FIG.
It can be measured using a center-of-gravity measuring device (for example, manufactured by Kamoshita Seikosho Co., Ltd.) 15 as shown in FIG. That is, the center-of-gravity measuring device 15 has an arm 16 which is swingable around a horizontal axis (an axis perpendicular to the paper surface) passing through the fulcrum P.
A scale 17 is provided at one end of 6. And the head 2
The head 2 is installed so that the center line C of the shaft mounting portion 2b of the above-mentioned shaft 12 coincides with the fulcrum P, and the head 2 is rotated around the center line C so that the arm 16 becomes horizontal and the maximum load W1 is balanced. Measure with the balance 17. When the weight of the head 2 is W2, the center of gravity distance L = (W1 / W2) × A A can be obtained from the balance of moments by the length of the arm from the fulcrum P to the scale.

If the center-of-gravity distance L is 31 mm or more, the effect of improving the return of the head 2 cannot be expected. On the other hand, if the center-of-gravity distance L is extremely small, the head 2 is very likely to return, and for example, it may be possible to hit the ball with the face surface 4a closed, and the hit ball may bend excessively to the left or the like. Head 2
Since the moment of inertia around the center line CL of the shaft 3 also becomes small, the movement of the head during a miss shot tends to increase. From this viewpoint, the center-of-gravity distance L is 25
~ 31mm.

Further, in this embodiment, the crown portion 5,
The thickness of each of the sole portion 6 and the side portion 7 is illustrated as gradually increasing from the toe portion t side toward the heel portion h side. For example, in the crown portion 5, the ratio (tc2 / tc1) of the minimum thickness tc1 on the toe portion t side and the maximum thickness tc2 on the heel side is set to, for example, 1.1 to 2.0. It is exemplified that the change is performed smoothly. Similarly, in the sole portion 6, the ratio of the minimum thickness ts1 on the toe portion t side to the maximum thickness ts2 on the heel portion h side (ts
2 / ts1) is set to, for example, 1.1 to 2.0, and an example is one in which changes in these thicknesses are performed smoothly. Further, in the side portion 7 as well, the ratio of the minimum thickness ti1 on the toe portion t side to the maximum thickness ti2 on the heel portion h side (t
i2 / ti1) is set to 1.1 to 2.0,
An example is one in which these changes in thickness are performed smoothly.

The present invention is not limited to such an embodiment, and is, for example, at least one of the crown portion 5, the sole portion 6, and the side portion 7, for example, the sole portion 6
It is also possible to increase only the thickness of the toe from the toe portion t side to the heel portion h side, and further, the thickness thereof increases smoothly as in this example, and also in a stepwise manner such as a step shape. But good. Even if the thickness of each part is made uniform, for example, due to a balance weight member including a synthetic resin material or a fluid disposed inside the head 2, or an improved welding position that tends to be heavy, It is also possible to adjust the position of the center of gravity G of the head 2.

Although one embodiment of the present invention has been described above, such a head 1 can be manufactured by various molding methods such as a lost wax method, casting, and forging.

[0025]

EXAMPLE A shaft was mounted on the golf club head shown in FIGS. 1 and 2, and a wood type golf club (Example) according to the present invention was prototyped according to the specifications shown in Table 1. A conventional wood-type golf club (comparative example) was prototyped according to the specifications in Table 1 and its performance was compared. Then, using these clubs, a performance test was conducted by comparing a performance of a ready test and an actual ball hitting test. In the trial hitting test, ten clubs were hit by 10 right-handed low handicap golfers (handicap 0 to 10) each having a relatively stable hitting point, and the directionality of the hitting ball was examined. As a result of the test, as shown in Table 1, in the club of the example, 10
I feel that up to 8 people out to the left, it's hard to slice,
It was confirmed that a stable directionality was obtained.

[0026]

[Table 1]

[0027]

As described above, according to the first aspect of the invention, the head volume is as large as 300 cc or more, so that it is possible to obtain a sense of security when holding the head and the distance L of the center of gravity.
By setting a small distance of 31 mm or less, the return of the head when hitting the ball can be improved,
It is easy for the face surface to return to the addressed state. Therefore, it is possible to preferably prevent the ball from hitting with the face surface open, and prevent slicing to stabilize the directionality of the hit ball.

Further, since the return of the head is improved, it is possible to hit a so-called draw rotation hit ball having an excellent flight distance, which is useful for increasing the flight distance while maintaining the directional stability. Since it is not necessary to previously set the face angle α of the face surface to be large on the hook side as in the conventional case, for example, the face angle can be made small and the ease of holding the club can be secured at the same time.

According to the second aspect of the invention, the thickness of the crown portion, the sole portion or the side portion of the head is gradually increased from the toe side to the heel side.
The center-of-gravity distance of the head can be effectively reduced.

[Brief description of drawings]

FIG. 1 is a partial front view of a golf club showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating the inside.

FIG. 3 is a conceptual diagram illustrating a method of measuring a head volume.

FIG. 4 is an explanatory diagram of a method of measuring a center-of-gravity distance.

FIG. 5 is a conceptual diagram illustrating a centroid distance.

FIG. 6 is a conceptual diagram illustrating opening of a face.

FIG. 7 is a plan view illustrating a face angle.

[Explanation of symbols]

1 Wood type golf club 2 Wood type golf club head 2a head body 2b Shaft mounting part 3 shafts 4 face part 5 Crown 6 sole part 7 Side part L center of gravity distance

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-9-271545 (JP, A) JP-A-11-57089 (JP, A) JP-A-9-28844 (JP, A) JP-A-8- 280853 (JP, A) JP-A-11-155982 (JP, A) JP-A-2000-140164 (JP, A) Practical example 7-7664 (JP, U) (58) Fields investigated (Int.Cl. ⁷⁾ , DB name) A63B 53/00-53/16

Claims (3)

(57) [Claims] 1. A and the head body, Shah which the shaft is inserted
A wood type golf club head having a shaft mounting portion formed of a shaft having a shaft mounting hole , the head volume being 300 cc or more, and the shaft.
The center-of- gravity distance L, which is the shortest distance from the center line of the shaft attachment portion that coincides with the center line of the shaft to the center of gravity of the head, is 25 to 3
A wood type golf club head characterized by being 1 mm . 2. The head body includes a crown portion which is connected to an upper edge of a face portion for hitting a ball and serves as an upper surface of the head, a sole portion which is connected to a lower edge of the face portion and serves as a lower surface of the head, and the crown portion and a sole. A side portion extending from the toe of the face portion to the heel of the face portion through the back face, and the thickness of the crown portion, the sole portion or the side portion is changed from the toe side to the heel side. The wood-type golf club head according to claim 1, wherein the wood-type golf club head is gradually increased toward the front. 3. A golf club, wherein a shaft is attached to a shaft mounting portion of the wood type golf club head according to claim 1 or 2.