KR100596956B1 - Golf club head - Google Patents

Abstract

It is a golf club head that enables low center of gravity without deteriorating aesthetic appearance and degrading strength, thereby enabling an increased distance. The golf club head has a hollow structure, has an opening in the crown portion, and is attached to a plate member made of a material having a specific strength of 294 N / mm ² or more. For example, this head has a volume of 350 cc or more, a center retraction amount GR from the shaft axis of 15 mm or more, and a center obtained from the maximum height FH of the face face and the center height GH on the face face. The position ratio GH / FH is 0.61 or less.

Golf club head, center position ratio, launch angle, distance, center retraction

Description

Golf club head {Golf club head}

1 is a front view showing a golf club head according to an embodiment of the present invention.

2 is a side view illustrating a golf club head according to an embodiment of the present invention.

3 is a cross-sectional view seen from the arrow X-X of FIG.

4 is a front view of a head periphery of a golf club for explaining the definition of club length in the present invention.

5 is a front view of a grip periphery of a golf club for explaining the definition of club length in the present invention.

6 is a side view illustrating an example of a central retraction amount measuring apparatus.

FIG. 7 is a side view illustrating a central retraction measurement by the measuring device of FIG. 6. FIG.

8 is a perspective view showing a center measuring unit of the head;

Fig. 9 shows a method for measuring the center of the head, and a side view of the head placed on the center meter.

10A and 10B show a method for measuring the center of the head, and FIG. 10A is a side view of the head in a position to be in equilibrium with respect to the center meter. 10B is a side view of the head in an unbalanced position with respect to the centimeter;

11 shows a method of checking the horizontality of a support of a centimeter, a side view of a state in which a level is placed on the centimeter.

* Description of the symbols for the main parts of the drawings *

1: Face part 1a: Face surface

2 crown portion 3 sole portion

4: hosel portion 5, 6: plate member

G: center

TECHNICAL FIELD The present invention relates to a golf club head having a hollow structure, and more particularly, to a golf club head designed to reduce the spin of the ball and increase the launch angle by lowering the center, thereby increasing the distance.

Background Art Conventionally, metal golf club heads having a hollow structure have been used for golf clubs such as utility clubs, fairway woods, and first wood. In such a golf club head, since the metal material is used not only in a face part and a soul part but also a crown part, the center height was high. In particular, when titanium material is used for the deep face No. 1 wood having a volume of 300 to 400 cc, the maximum weight of the head is limited even if the limit thickness design is designed to ensure the minimum strength required. It was difficult to adjust the center position so that it was difficult to realize the low center of gravity.

In contrast, Japanese Patent Application Laid-Open No. 5-317465 proposes a golf club head in which a metal material is not disposed in the crown portion. However, this golf club head had poor appearance and insufficient strength because the golf club head had only a hole in the crown portion or a plate made of a lightweight resin or the like in the crown portion.

An object of the present invention is to enable a low center of gravity, even at a so-called deep face, without impairing aesthetics and degrading strength, thereby increasing the flying distance by reducing the spin of the ball and increasing the launch angle. It is in providing a golf club head made possible.

The golf club head of the present invention for achieving the above object is characterized in that the opening is provided in the crown portion, the plate member made of a material having a specific strength of 294 N / mm ² or more in the opening.

Here, the specific strength means that the tensile strength (N / mm ² ) is excluded from the specific gravity, and the larger the specific strength, the lighter the weight and higher the strength. Therefore, by replacing the metal material of the crown portion with the plate member, the golf club head can be reduced in center of gravity even at a so-called deep face, without damaging the aesthetics and lowering the strength. By realizing such a low center of gravity, it is possible to reduce the spin of the ball and to increase the launch angle and to increase the flying distance to the maximum.

In order to sufficiently achieve the low center of gravity of the golf club head, it is preferable that the ratio of the surface area of the plate member occupying the upper part than the half position of the maximum height of the crown portion is 20% or more.

ADVANTAGE OF THE INVENTION According to this invention, in the golf club head which has a hollow structure, it becomes possible to implement the novel golf club head provided with the weight distribution which does not exist conventionally.

That is, in the golf club head of the present invention, in the golf club head having a hollow structure, the volume is 350 cc or more, the central retraction amount GR from the shaft axis is 15 mm or more, and the maximum height FH and the face of the face surface. The center position ratio GH / FH determined from the center height GH on the surface is 0.61 or less.

In the golf club head of the present invention, the golf club head having a hollow structure has a volume of 300 cc or more and less than 350 cc, a central retraction amount GR from the shaft axis is 18 mm or more, and the maximum height FH of the face surface. The center position ratio GH / FH obtained from the center height GH on the face face is 0.55 or less.

Furthermore, the golf club head of the present invention is a golf club head having a hollow structure in which the volume is 150 cc or more and less than 200 cc, the center retraction amount GR from the shaft axis is 12 mm or more, and the maximum height FH of the face surface. The center position ratio GH / FH obtained from the center height GH on the face face is 0.50 or less.

Furthermore, in the golf club head of the present invention, the golf club head having a hollow structure has a volume of 100 cc or more and less than 150 cc, a central retraction amount GR from the shaft axis is 8 mm or more, and the maximum height FH of the face surface. ) And the center position ratio GH / PH obtained from the center height GH on the face surface is 0.50 or less.

The golf club head described above can be realized by providing an opening in the crown portion and attaching a plate member made of a material having a specific strength of 294 N / mm ² or more to the opening. However, the golf club head which achieved the said weight distribution by another means is also contained in this invention.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is described in detail, referring an accompanying drawing.

1-3 illustrate a golf club head according to an embodiment of the invention. As shown in FIG. 1 and FIG. 2, the golf club head of this embodiment has a hollow structure formed by connecting the crown portion 2 and the sole portion 3 to the face portion 1. Moreover, this golf club head is equipped with the shaft mounting hosel part 4 in the heel side. As a constituent material of the golf club head, metal materials such as titanium and aluminum can be used.

In the golf club head, an opening portion 2a is provided in the crown portion 2, and a plate member 5 is attached to the opening portion 2a. This plate member 5 is molded from a material having a specific strength of 294 N / mm ² or more. The upper limit of the specific strength is not particularly limited functionally, and a higher specific strength can be selected as long as a material having a higher specific strength exists. Examples of the material constituting the plate member 5 include fiber-reinforced plastics formed by impregnating reinforcing fibers such as carbon fibers, glass fibers, and aramid fibers with matrix resins such as epoxy resins, unsaturated polyester resins, and vinyl ester resins. It is preferable to make carbon fiber a reinforcing fiber. In addition, the material constituting the plate member 5 preferably has a specific gravity of 0.5 to 2.0.

By replacing the metal material of the crown portion 2 with the plate member 5 made of a material having a high specific strength, it is possible to lower the center G of the golf club head by relatively reducing the weight distribution of the upper head. Moreover, since the plate member 5 exists in the crown part 2 and the opening part 2a is not exposed, it does not damage aesthetics, and since the plate member 5 has a high specific strength, the head strength is increased. There is no deterioration. Therefore, even a golf club head having a large volume (a face whose upper and lower width is 46 mm or more, for example) with a large volume can achieve low center of gravity. By lowering the center of the golf club head, it is possible to reduce the spin of the ball and increase the launch angle, thereby increasing the flying distance to the maximum.

In the said golf club head, as shown in FIG. 2, the ratio of the surface area of the plate member 5 which occupies upper part than 1/2 position of the maximum height MH of the crown part 2 may be 20% or more. Thus, by setting the surface area ratio of the plate member 5 to 20% or more, the low center of gravity of a golf club head can be achieved sufficiently. The upper limit of the surface area ratio is not particularly limited functionally, but considering the structure of the golf club head, the upper limit is preferably 90%.

The plate member 5 can adhere to the opening 2a of the crown portion 2. For example, as shown in FIG. 3, a step is formed in the peripheral edge of the opening part 2a of the crown part 2, while the peripheral edge of the plate member 5 is processed to match this step, and this is an opening part. It adheres to (2a). If necessary, the plate member 6 made of the same material may be bonded to the plate member 5 from the inside of the head. Thereby, the plate member 5 can be firmly mounted with respect to the crown part 2. Of course, the mounting method of the plate member 5 is not limited to the above adhesion, but may be another method. In addition, although the presence of the plate member 5 is clear in a figure, when it coats, there is no influence on aesthetics at all.

According to this invention, it becomes possible to comprise the following golf club heads.

As the first golf club head, the volume is 350 cc or more, the central retraction amount GR from the shaft axis S is 15 mm or more, and the maximum height FH of the face face 1a and the face face 1a are determined. A golf club head having a center position ratio GH / FH obtained from the center height GH is 0.61 or less, more preferably 0.55 or less. In this case, the upper limit of the volume of the golf club head is not particularly limited functionally, but in order to obtain the strength required for the ball, the upper limit thereof is preferably 600 cc, preferably 500 cc, more preferably 400 cc.

The second golf club head has a volume of 300 cc or more and less than 350 cc, a central retraction amount GR from the shaft axis S is 18 mm or more, and the maximum height FH of the face face 1a and the face face 1a. A golf club head having a center position ratio (GH / FH) obtained from the center height GH on the bed is 0.55 or less, more preferably 0.50 or less.

As the third golf club head, the volume is 150 cc or more and less than 200 cc, the center retraction amount GR from the shaft axis S is 12 mm or more, and the maximum height FH of the face face 1a and the face face 1a. A golf club head is provided whose center position ratio (GH / FH) obtained from the center height (GH) of the phase is 0.50 or less.

As the fourth golf club head, the volume is 100 cc or more and less than 150 cc, the center retraction amount GR from the shaft axis S is 8 mm or more, and the maximum height FH of the face face 1a and the face face 1a. A golf club head is provided whose center position ratio (GH / FH) obtained from the center height (GH) of the phase is 0.50 or less.

Here, the center retraction amount GR means that the head is provided on the reference plane B at the lie angle, and the face surface 1a is directed toward the non-spherical direction, and the center G of the head and the shaft axis ( It is the distance from the plane perpendicular to the reference plane B, including S).

Here, the installation according to the lie angle is a state in which the gap formed between the round of the sole surface of the head and the mounting surface formed of the plane is substantially the same on the toe side and the heel side. If the round of the soul surface is unclear, the score line and the installation surface are set in parallel. When the round of the soul surface is unclear and the score line is not straight, and the parallel with the installation surface cannot be discriminated, it is set as the lie angle (degrees) = (00-club length (inches)). For example, with a club length of 44 inches, the lie angle is 100-44 = 56 degrees.

Club length is measured by the measurement method established by the Japan Golf Goods Association. As a measuring instrument, Club Major II manufactured by Camoshita Co., Ltd. can be mentioned. In other words, Figures 4 and 5, the starting point the heel end portion (P ₁₎ to the grip end to the end point (P ₂₎ when in, the distance (C) between these P _1, P ₂ clubs Length.

As described above, the center retraction amount GR is measured by the seesaw type gauge 10 that is slidable in the direction of the arrow U around the point 11. The balance gauge 10 has a shaft pin 12 having a gap-free fitting with respect to the hosel hole of the head, and is balanced so that the arm 13 is horizontal when the head or the weight body is not mounted. Here, as shown in FIG. 7, the head 31 of the mass W is inserted in the shaft pin 12 extended in a perpendicular direction, the head 31 is rotated, and the above-mentioned center retraction amount GR is mentioned. It is fixed in the state measured along the arm long side direction. That is, the center retraction amount GR coincides with the distance L between the plane P orthogonal to the arm long side direction through the point and the center G of the head 31. Since the loft angle and the lie angle exist in the head 31 at the side surface of this ceiling system 10, the face surface 1a is in a state which is seen a little.

Then, using the weight 14 of the mass W ', the length L' from the center G 'of the weight 14 to the point is selected so that the arm 13 is horizontally balanced. . As a result, the center retraction amount GR can be obtained from GR = L = (W ′ × L ′) / W based on a balanced equation W × L = W × L '. Although the above description is a measuring principle of the center retraction amount GR from the shaft axis, the measuring device includes a center measuring device manufactured by Camoshita Co., Ltd.

On the other hand, as shown in FIG. 3, the maximum height FH of a face surface is provided with the head on the reference surface B at the lie angle, and the face surface 1a is in the non-spherical direction, It is the height from the reference surface B to the highest position of the face surface 1a. In addition, the center height GH on the face surface means the face surface 1a which consists of the point g where the waterline which fell from the center G toward the face surface 1a, and the face surface 1a cross | intersect. When the center position of a phase is calculated | required, it is the height from the reference plane B to the point g in the installation state similar to the above.

The point g on the face face 1a of the head is obtained by the centimeter 41 as shown in FIG. 8. The center measuring device 41 has a support 42 for supporting a center measurement object on the upper portion, and the support 42 can know the position of the measurement object that supports the measurement object in equilibrium. That is, when the center position on the face surface 1a is calculated | required, as shown in FIG. 9, the head 31 is placed in the support part 42, and the equilibrium position which does not fall even if a hand is released is found. That is, as shown in FIG. 10A, if the point g is included in the contact portion between the face face 1a and the support part 42, the head 31 is not dropped even when the hand 31 is released from the support part 42. As shown in 10b, if the point g is not included in the contact between the face face 1a and the support part 42, the head 31 falls on the support part 42 when the hand is released. Using this, the point g is obtained.

It is preferable that the support part 42 is a form supporting a plane or three or more points. Moreover, it is preferable that the area of the support part 42 is 15 mm <^2> or less. The lower limit is not particularly limited as long as the head 31 is supported. The area of the support part 42 is shown by the area of a planar part if it is planar, and the area of the figure which connected each point if it is a form which supports more than 3 points. By setting the area of a support part to the said range, the point g can be calculated | required more correctly.

It is preferable that the plane formed by the support part 42 be horizontal or approximately horizontal. Here, approximately horizontal means that the inclination with respect to the horizontal plane is within 2 degrees, preferably 1 degree. Whether it is horizontal or approximately horizontal, for example, as shown in FIG. 11, by placing and supporting the flat plate 51 on the support part 42, by placing the level 52 on the flat plate 51 You can check it. By setting the plane inclination of the support part 42 in the said range, it becomes possible to calculate | require the point g more correctly.

The above-described center retraction amount GR is an important factor for raising the batting pitch, and the larger this is, the easier the batting pitch is to rise. The upper limit of the center retraction amount GR is not particularly limited in function, but considering the setting of the hosel position and the weight distribution of the golf club head, 70 mm when the volume is 350 cc or more and 70 mm when the volume is 300 cc or more and less than 350 cc When the volume is 150 cc or more and less than 200 cc, it is preferable to set 55 mm and 50 mm when the volume is 100 cc or more and less than 150 cc. By setting the center retraction amount GR within the above range, it is possible to obtain a sufficient launch angle.

In addition, the central position ratio (GH / FH) is an indicator of low center of gravity. The lower limit of the center position ratio (GH / FH) is not particularly limited in function, but considering the weight distribution of the golf club head, 0.35 for the volume of 350cc or more, 0.33 for the volume of 300cc or more and less than 350cc, the volume It is preferable to set it as 0.30 when it is 150 cc or more and less than 200 cc, and when it is 100 cc or more and less than 150 cc, it is 0.30. By setting the center position ratio GH / FH within the above range, it is possible to obtain a sufficient flying distance.

In particular, when the volume is set large like the first and second golf club heads, the center retraction amount GR is increased as much as possible without adding a weight body, and the center position ratio GH / FH is made as small as possible. It becomes possible.

On the other hand, in the case where the volume is set small like the third and fourth golf club heads, the center retraction amount GR is made as large as possible even if expensive metals such as tungsten are not used as the weight, and the center position ratio ( GH / FH) can be made as small as possible.

(Example)

In a titanium alloy golf club head having a hollow structure, the first to fourth embodiments and the first to fourth embodiments in which the volume, the center retraction amount (GR), and the center position ratio (GH / FH) are variously changed as shown in Table 1 Four comparative examples were produced, respectively. In the golf club heads of the first to fourth embodiments, an opening is provided in the crown portion, and the opening is provided with a plate member made of carbon fiber reinforced plastic having a specific strength of about 1415 N / mm ² . The surface area ratio of the plate member which occupies upper part than 1/2 position of the maximum height of a crown part is shown in Table 1.

The golf clubs equipped with these golf club heads are prepared, and the sweet spot of the golf club head is set to the RBI position, the head speed is set to 40 m / s, and a swing robot is used to perform a spin, the throw angle, and the flying distance are evaluated. The results are shown in Table 1 together. These evaluation results were shown as the index which makes the 1st-4th comparative example corresponding to the 1st-4th Example respectively 100. Spin means that the smaller the exponent value, the better. Spinning angle and the flying distance means that the larger the index value, the better.

Volume (cc) GR (mm) GH / FH % Surface area of plate member Spin Shot angle Flying distance First Comparative Example 396 14.2 0.62 - 100 100 100 First embodiment 400 16.2 0.51 30.8 94 106 112 2nd comparative example 310 16.0 0.56 - 100 100 100 Second embodiment 335 19.1 0.47 32.0 92 108 113 Third Comparative Example 170 13.0 0.53 - 100 100 100 Third embodiment 151 15.0 0.48 27.5 96 105 109 Fourth Comparative Example 135 10.0 0.55 - 100 100 100 Fourth embodiment 128 12.0 0.46 24.5 97 104 106

As can be seen from Table 1, the golf club heads of the first to fourth embodiments had fewer spins, larger launch angles, and larger flying distances than the first to fourth comparative examples.

According to the present invention, in a golf club head having a hollow structure, an opening is provided in a crown portion, and a plate member made of a material having a specific strength of 294 N / mm ² or more is attached to the opening, without damaging the appearance. In addition, it is possible to lower the center of gravity even at the deep face without lowering the strength, thereby reducing the spin of the ball and increasing the launch angle, thereby increasing the flying distance.

In addition, according to the present invention, as a novel golf club head having a weight distribution that does not exist conventionally, by providing the golf club heads of the following (1) to (4), it is possible to lower the center of gravity and thereby spin the ball. It is possible to reduce the reduction and increase the launch angle, thereby increasing the flying distance.

(1) In the golf club head having a hollow structure, the volume is 350 cc or more, the center retraction amount GR from the shaft axis is 15 mm or more, and the maximum height FH of the face face and the center height on the face face ( Golf club head whose center position ratio (GH / FH) calculated | required from GH) is 0.61 or less.

(2) In the golf club head having a hollow structure, the volume is 300 cc or more and less than 350 cc, the center retraction amount GR from the shaft axis is 18 mm or more, the maximum height FH of the face face and the center on the face face. Golf club head whose center position ratio (GH / FH) calculated | required from height GH is 0.55 or less.

(3) In the golf club head having a hollow structure, the volume is 150cc or more and less than 200cc, the center retraction amount GR from the shaft axis is 12mm or more, the maximum height FH of the face face and the center on the face face. Golf club head whose center position ratio (GH / FH) calculated | required from height GH is 0.50 or less.

(4) In the golf club head having a hollow structure, the volume is 100cc or more and less than 150cc, the center retraction amount GR from the shaft axis is 8mm or more, the maximum height FH of the face face and the center on the face face. Golf club head whose center position ratio (GH / FH) calculated | required from height GH is 0.50 or less.

As mentioned above, although preferred embodiment of this invention was described in detail, it should be understood that various changes, substitution, and substitution can be made with respect to this, unless the mind and range of this invention defined by an attached claim are deviated.

Claims (8)

A golf club head having a hollow structure, wherein an opening is provided in a crown portion, and a golf club head comprising a plate member made of a material having a specific strength of 294 N / mm ² or more in the opening. In the golf club head having a hollow structure, the volume is 350 cc or more, the center retraction amount GR from the shaft axis is 15 mm or more, and from the maximum height FH of the face face and the center height GH on the face face. A golf club head, wherein the calculated center position ratio (GH / FH) is 0.61 or less. In the golf club head having a hollow structure, the volume is 300cc or more and less than 350cc, the center retraction amount GR from the shaft axis is 18mm or more, the maximum height FH of the face face and the center height GH on the face face. The center position ratio (GH / FH) calculated | required from ()) is 0.55 or less, The golf club head characterized by the above-mentioned. In the golf club head having a hollow structure, the volume is 150cc or more and less than 200cc, the center retraction amount GR from the shaft axis is 12mm or more, the maximum height FH of the face face and the center height GH on the face face. A golf club head, wherein the center position ratio (GH / FH) obtained from In the golf club head having a hollow structure, the volume is 100cc or more and less than 150cc, the center retraction amount GR from the shaft axis is 8mm or more, the maximum height FH of the face face and the center height GH on the face face. The center position ratio (GH / FH) calculated | required from ()) is 0.50 or less, The golf club head characterized by the above-mentioned. The golf club head according to any one of claims 2 to 5, wherein an opening is provided in the crown portion, and the opening is provided with a plate member made of a material having a specific strength of 294 N / mm ² or more. The golf club head according to claim 1, wherein a ratio of the surface area of the plate member occupying an upper portion than a half position of the maximum height of the crown portion is 20% or more. 7. The golf club head according to claim 6, wherein a ratio of the surface area of the plate member occupying an upper portion than a half position of the maximum height of the crown portion is 20% or more.

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