JP2000288131A - Wood type golf club head and golf club using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wood type golf club head stabilizing the directionality. SOLUTION: The wood type golf club head 1 having a head body 2a and a shaft mounting part 2b mounted with a shaft 3, is so formed that the head volume is 300 cc or more and that the center-of-gravity distance L which is the shortest distance from the center line CL of the shaft mounting part 2b to the center-of-gravity G of the head 1 is 31 mm or less.

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 a wood-type golf club head has tended to increase with the improvement in manufacturing technology. A golf club head having a head volume of 300 cc or more can be manufactured by a driver or the like. With the increase in the size of the head, the length of the shaft also tends to increase. However, in such a golf club, as the head volume increases, 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 shown in FIG.

[0003] When the distance L of the center of gravity of the head b becomes large, the "return" of the head b tends to be poor when hitting a ball. Such a tendency is remarkable especially in combination with a long shaft. Become. Here, in a golf club having a poor head return, as shown in FIG.
In many cases, the face c, which is the surface on which the ball is hit, does not sufficiently return to the state at the time of addressing (usually, the face c is at right angles to the target flying line), and the ball is opened with the face c open. B is easy to hit. Therefore, in the case of a right-handed golfer, the directionality is not stable, for example, the hit ball is launched to the right side of the target flight line, and the ball B is easily given a slice rotation for bending the ball B to the right. There is a problem of leprosy.

Conventionally, in order to solve such a problem, as shown in FIG. 7, the face angle α of the face surface c is set in advance on the hook side (+ side in the figure) with respect to 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 does not sufficiently return. 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 heel j of the face c when the sole is attached to the ground.
The angle of the direction.

[0005]

However, in the head b having a large face angle α as described above, the face c is not as shown in FIG. 7 where the shaft a is positioned on the vertical plane N. Because it will face to the left,
There is also an adverse effect that the head b is difficult to align with the target direction and is difficult to hold.

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

The prior art is disclosed in Japanese Patent Application Laid-Open No. 6-9895.
No. 4 has been proposed. This suggests that the position of the center of gravity of the metal head is set to the shaft side, but this suppresses the "hook phenomenon due to the head fogging movement", and the subject is completely different from the present invention. ,
In addition, there is no specific suggestion about the center of gravity distance and the head volume.

[0008]

According to a first aspect of the present invention, there is provided a wood type golf club head having a head body and a shaft mounting portion to which a shaft is mounted, wherein the head volume is 300 cc or more. And the center-of-gravity distance that is the shortest distance from the center line of the shaft mounting portion to the center of gravity of the head is set to 31 mm or less.

The head body includes a crown portion connected to an upper edge of a face portion hitting a ball and forming an upper surface of the head, a sole portion connected to a lower edge of the face portion and forming a lower surface of the head, and the crown portion and the sole portion. And a side portion extending from the toe of the face portion to the heel of the face portion through the back face,
It may also be 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.

[0010] Further, a golf club is provided in which a shaft is mounted on a shaft mounting portion of such a wood type golf club head and a shortest distance from the center line of the shaft to the center of gravity of the head is 31 mm or less. Can be.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 taking a wood type golf club of a driver (# 1) as an example. FIG. 1 is a partial front view of a wood type golf club 1 of the present embodiment, and FIG. 2 is a sectional view of a head. Wood-type golf club (hereinafter sometimes simply referred to as “club”) 1 of the present embodiment 1
Includes a wood-type golf club head (hereinafter, may be simply referred to as a “head”) 2 and a shaft 3,
For example, a grip (not shown) is attached to one end of the shaft 3.

The head 2 is a head body 2a in this embodiment.
And a shaft mounting portion 2b to which the shaft 3 is mounted, and has a head volume of 300 cc or more.
As described above, the head is constituted by a large head having a volume of 300 cc or more, so that a sense of security can be obtained when the head is held, and the meet rate can be increased.

The head main body 2a is connected to an upper edge of a face portion 4 having a face surface 4a which is a surface for hitting a ball, and is connected to an upper edge of the head portion, and a lower portion of the head portion is connected to a lower edge of the face portion 4. And the sole part 6
And a side portion extending from the toe portion t to the heel portion h through the back face. Further, in this example, the shaft attachment portion 2b is formed of a shaft-like body formed at a position where the face portion 4, the crown portion 5, and the side portion 7 intersect on the heel portion h side.
In the figure, there is shown an example having a shaft mounting hole 9 into which the shaft 3 can be inserted and fixed with, for example, an adhesive.

The head volume refers to 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, water having a specific gravity of pg / cc is filled in a container 10 in which the head 2 is sufficiently stored, and the container 10 is placed on an electronic balance 11 to measure the entire weight. Thereafter, the head 2 of the club 1 suspended in the air with a suspending tool 12 such as a wire.
Is submerged in the water of the container 10 up to the upper end of the shaft mounting portion 2b. 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
As the total weight increases by the amount of water displaced,
The increased weight dW is measured by the electronic balance 11. Then, the increased weight dW is divided by the specific gravity ρ of water (dW / ρ).
Thus, the volume of the head 2 can be measured. If the head volume is too large, the weight of the head 2 increases and the head 2 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 besides this, other plastic titanium alloys, pure titanium, aluminum alloys, etc.
In addition to high-strength and low-specific-gravity materials, various other alloys and composite materials, and other various materials such as, for example, 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 5, the sole 6, or the side 7 is gradually increased from the toe t to the heel h. 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 matches the center line CL of the shaft) to the center of gravity G of the head 2 to 31 mm or less. The setting is exemplified. In the case of the conventional head, when the head volume is 300 cc or more, the center of gravity distance is a value 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, so that a sense of security or the like can be obtained when the head 2 is held.
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. Accordingly, it is possible to preferably prevent the ball from being hit with the face surface 4a opened, and it is possible to suppress slicing or the like and to help stabilize the direction of the hit ball.

Further, since the return of the head 2 is improved, for example, it is possible to hit a so-called draw rotation (a rotation in the hook direction, but with a small degree of hook) which is excellent in flight distance, thereby stabilizing the direction. This is effective in achieving an increase in flight distance while maintaining the same. Furthermore, head 2
Is improved, 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 related art, and therefore, the ease of setting 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 °.

In the club 1 of the present embodiment, the head 2
It is possible to further lengthen the shaft 3 and the like by an amount that is easy to return, which is more effective in increasing the head speed and increasing the flight distance. For example, the club 1 of this example has a total length of 45
It is possible to easily increase the length to at least inches, more preferably at least 46 inches, and even more preferably 46 to 48 inches.

The center-of-gravity distance L of the head 2 is shown in FIG.
Can be measured using a center of gravity measuring device 15 (for example, manufactured by Kamoshita Seisensho Co., Ltd.) as shown in FIG. That is, the center-of-gravity measuring device 15 has an arm 16 that can swing about a horizontal axis passing through the fulcrum P (an axis perpendicular to the paper surface).
6 has a scale 17 at one end. And the head 2
The head 2 is installed such that the center line C of the shaft mounting portion 2b is aligned 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 that is balanced. It measures with the balance 17. Assuming that the weight of the head 2 is W2, the center of gravity L = (W1 / W2) × A A: the length of the arm from the fulcrum P to the scale can be obtained from the balance of the moment.

If the distance L of the center of gravity is more than 31 mm, the effect of improving the return of the head 2 cannot be expected. Conversely, if the center-of-gravity distance L is extremely small, the head 2 becomes very easy to return. For example, the ball may be hit with the face surface 4a closed, and the hit ball may be excessively bent leftward. Head 2
Also, the moment of inertia about the center line CL of the shaft 3 becomes small, so that the movement of the head at the time of a miss shot tends to increase. From such a viewpoint, it is desirable that the center-of-gravity distance L is preferably 20 to 31 mm, more preferably 25 to 31 mm.

In the present embodiment, the crown portion 5,
The thickness of each of the sole portion 6 and the side portion 7 is gradually increased from the toe portion t toward the heel portion h. For example, in the crown portion 5, the ratio (tc2 / tc1) of the minimum thickness tc1 on the toe portion t side to the maximum thickness tc2 on the heel side is set to, for example, 1.1 to 2.0. The change is performed smoothly. Similarly, in the sole portion 6, the ratio (ts) between the minimum thickness ts1 on the toe portion t side and the maximum thickness ts2 on the heel portion h side.
2 / ts1) is set to, for example, 1.1 to 2.0, and an example in which the change in the thickness is smoothly performed is exemplified. Further, also in the side part 7, the ratio (t) between the minimum thickness ti1 on the toe part t side and the maximum thickness ti2 on the heel part h side is obtained.
i2 / ti1) is set to, for example, 1.1 to 2.0,
An example in which the change in the thickness is also made smoothly is exemplified.

The present invention is not limited to such an embodiment. For example, at least one or more of the crown 5, the sole 6, and the side 7 may be used.
May be increased from the toe part t side to the heel part h side. Further, the thickness may be increased smoothly as in this example, or may be increased stepwise like a step. But it is good. Further, even when the thickness of each part is made uniform, for example, a balance weight member including a synthetic resin material or a fluid disposed inside the head 2 or an improvement in a welding position where the weight tends to be large, etc. It is also possible to adjust the position of the center of gravity G of the head 2.

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

[0025]

EXAMPLE A wood-type golf club (Example) according to the present invention was prototyped with the specifications shown in Table 1 by attaching a shaft to the golf club head shown in FIGS. A prototype of a conventional wood type golf club (comparative example) was also produced according to the specifications shown in Table 1 and the performance was compared. Then, using these clubs, an easy-to-hold test and a test hit test for actually hitting the ball were performed, and the performance was compared. In the test hitting test, ten right-handed low handicap golfers (handicaps 0 to 10) having relatively stable hitting points performed test hits for each of ten clubs, and the directionality of hitting balls 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 are on the left and it is difficult to slice,
It was confirmed that a stable direction was obtained.

[0026]

[Table 1]

[0027]

As described above, according to the first aspect of the present invention, since the head volume is as large as 300 cc or more, a sense of security can be obtained when the head is held, and the center of gravity L
Is set to a small distance of 31 mm or less, it is possible to improve the return of the head when hitting the ball,
It becomes easy for the face surface to return to the addressed state. Therefore, it is possible to preferably prevent the ball from being hit with the face open, and prevent slicing to stabilize the directionality of the hit ball.

In addition, since the return of the head is improved, it is possible to hit a so-called draw-rotation hitting ball having an excellent flight distance, which is useful for achieving an increase in the flight distance while maintaining directional stability. Since it is not necessary to previously set the face angle α of the face surface to a large value on the hook side as in the related art, it is possible to reduce the face angle, for example, and simultaneously secure the ease of holding the club.

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

[Brief description of the drawings]

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

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

FIG. 3 is a conceptual diagram illustrating a method for 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 center of gravity 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]

 DESCRIPTION OF SYMBOLS 1 Wood type golf club 2 Wood type golf club head 2a Head main body 2b Shaft attachment part 3 Shaft 4 Face part 5 Crown part 6 Sole part 7 Side part L Center of gravity distance

Claims (3)

[Claims] 1. A wood-type golf club head having a head body and a shaft mounting portion to which a shaft is mounted, wherein the head volume is 300 cc or more, and a center of gravity of the head from a center line of the shaft mounting portion. Characterized in that the shortest distance to the center of gravity L is 31 mm or less. 2. The head body includes a crown portion connected to an upper edge of a face portion hitting a ball and forming an upper surface of the head, a sole portion connected to a lower edge of the face portion and forming a lower surface of the head, and the crown portion and a sole. A side portion extending from a toe of the face portion to a heel of the face portion through a back face, and a thickness of the crown portion, the sole portion or the side portion, from a toe side to a heel side. 2. The wood-type golf club head according to claim 1, wherein the head is gradually increased. 3. A wood-type golf club head according to claim 1, wherein a shaft is mounted on a shaft mounting portion, and a center-of-gravity distance L which is a shortest distance from a center line of the shaft to a center of gravity of the head is set to 31 mm or less. A golf club characterized by: