JP3720628B2 - Golf club head - Google Patents

Description

【００３５】
テストの結果、実施例１〜３のものは、試打テスト後も中空部に固定されており、良好な耐久性を備えていることが確認できた。また比較例１では、ウエイト体接合用のボルトが折れ、ウエイト体がヘッドの中空部に対して外れていた。また比較例２では、重量調整材がトウ側に移動して位置ずれしていた。
【００３６】
【発明の効果】
上述したように、請求項１記載の発明では、必要な量だけ重量調整材をヘッド内部に配することでヘッド重量が目標重量に精度良く管理される。また、ヘッド内部の中空部を複数の中空室に仕切る隔壁を設け、その中空室に重量調整材を配することにより、前記隔壁は流動状態の重量調整材を流れ止めし所定の位置で滞留させることができる。従って、重量調整材の固定位置を調整することができ、ひいては、ヘッドの重心位置の調整が容易に行える。
【００３７】
またヘッドの内部の中空部を、トウ側の隔壁よりもトウ側に位置するトウ側中空室と、ヒール側の隔壁よりもヒール側に位置するヒール側中空室と、これらの間に位置する１以上の中の中空室とを含んで形成し、そのトウ側中空室又はヒール側中空室の何れか一方に重量調整材を配することにより、重心位置を効果的に移行でき、ヘッドのヒール寄り、トウ寄り又は中央寄りなどさらに容易に設定することができる。又前記比（Ｈｇ／Ｈ）を０．０５〜０．４とすることにより、ヘッド１の重心位置を低重心化するのに役立ち、ボールを上げやすくしうるヘッドを提供できる。
【００３８】
また請求項２記載のように、ヘッドの内部に対する重量調整材の重心位置を限定することにより、より効果的にヘッドの重心位置を設定しうる。
【図面の簡単な説明】
【図１】 本発明の実施形態を示すヘッドの基準状態の平面図である。
【図２】 そのＡ−Ａ断面図である。
【図３】 図１のＡ−Ａ位置に相当する場合を単に例示する断面図である。
【図４】 （Ａ）、（Ｂ）は、他の例を単に示す斜視図である。
【図５】 図１のＡ−Ａ位置に相当する比較例のヘッドの断面図である。
【図６】 （Ａ）〜（Ｃ）は、従来のヘッドの断面図である。
【符号の説明】
１ ゴルフクラブヘッド
２ フェース面
３ クラウン部
４ ソール部
５ サイド部
６ シャフト取付部
７ 重量調整材
９ 隔壁
９Ａ トウ側の隔壁
９Ｂ ヒール側の隔壁
１０ 注入孔
１１ 閉塞具
Ｏ 中空部
Ｏａ トウ側中空室
Ｏｂ ヒール側中空室
Ｏｃ 中の中空室[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a golf club head that can easily adjust the position of the center of gravity while adjusting the weight.
[0002]
[Prior art]
Golf club heads (hereinafter sometimes simply referred to as “heads”) require high-precision weight management in terms of product quality. In such a head, each part is usually formed by casting, forging, or the like, and after joining them, finishing such as polishing is performed. Further, since the head is composed of a three-dimensional free-form surface, it is difficult to mechanize the polishing work, and it is necessary to rely on manual polishing manual work. For this reason, it is difficult to manufacture the final head weight so that it falls within the tolerance of the target weight.
[0003]
For this reason, for example, as shown in JP-A-8-257174, in a head having a hollow portion therein, the head is first manufactured lighter than the target weight, and then, as shown in FIG. A weight adjusting material b that is in a fluidized state by heating and is cured by cooling is injected into the head a, and the weight adjusting material b is cured and fixed inside the head a by cooling the head a. . Thereby, the weight of the head a can be adjusted accurately. Further, when the head a is tilted and the weight adjusting material b in a fluid state is flowed to a predetermined position and cooled, as shown in FIGS. 6B and 6C, the head a is closer to the toe t side or the heel side h. The weight adjusting material b can be disposed, and the center of gravity of the head a can be adjusted in addition to the weight adjustment.
[0004]
[Problems to be solved by the invention]
The above-described method has an advantage that the head weight can be accurately managed. However, as shown in FIGS. 6B and 6C, when the center of gravity position of the head a is to be changed, for example, near the toe t side or the heel. When it is desired to set the position closer to the h side, the weight adjusting material b is always tilted to a predetermined position and kept in that state in order to cause the weight adjusting material b in a fluid state to flow to a predetermined position inside the head. There has been a problem that the manufacturing process becomes complicated due to cooling and curing. Further, for example, when it is desired to arrange the weight adjusting material b only on the toe t side and only on the sole s side, it is difficult to position the weight adjusting material b, and there is a restriction on the arrangement position thereof.
[0005]
The present invention has been made devised in view of the above problems, only setting a partition wall for dividing the hollow portion of the interior of the head into a plurality of hollow chambers, with one of the hollow chambers, without the fluid state by heating In addition, based on the arrangement of the weight adjusting material fixed to the hollow chamber so as to be immovable by curing at room temperature, the weight adjusting material in a flow state is stopped by the partition wall and the weight adjusting material is placed at a predetermined position. It is an object of the present invention to provide a golf club head capable of easily adjusting the center of gravity of the head as well as adjusting the weight of the head.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention is a golf club head having a hollow portion therein, and is provided with a partition wall that divides the hollow portion into a plurality of hollow chambers, and flows into at least one hollow chamber by heating. It is characterized in that a weight adjusting material that is fixed and immovably fixed to the hollow chamber by being cured at room temperature is provided.
[0007]
The partition wall includes a toe side partition wall that rises from the inner surface of the sole portion and extends from the face surface side to the back face side and a heel side partition wall that extends toward the heel side. The hollow portion includes a toe side hollow chamber located on the toe side with respect to the toe side partition wall, a heel side hollow chamber located on the heel side with respect to the heel side partition wall, and one or more positioned therebetween. And a hollow chamber inside .
[0008]
Furthermore, the invention of claim 1 is provided with an injection hole for injecting the weight adjusting material into one of the toe side hollow chamber and the heel side hollow chamber, and an obturator for closing the injection hole. It is a golf club head characterized by that.
[0009]
Moreover, the invention according to claim 1 is a cross-section parallel to the vertical plane passing through the center of gravity of the head in a reference state in which the face surface is inclined at a loft angle with respect to the vertical plane and the sole portion is placed on a horizontal plane
The hollow portion in which the weight adjusting material is arranged has a center-of-gravity height Hg that is a height from the lowest position of the hollow portion to the center of gravity of the weight adjusting material, and a height from the lowest position to the highest position of the hollow portion. The ratio (Hg / H) to the maximum height H of the hollow portion is 0.05 to 0.4 .
[0010]
According to a second aspect of the present invention, in the cross-section parallel to the vertical plane passing through the center of gravity of the head in a reference state in which the face surface is inclined at a loft angle with respect to the vertical plane and the sole portion is mounted on a horizontal plane, A hollow portion length W which is a horizontal length between a toe end of the hollow chamber and a heel end of the heel side hollow chamber, and a horizontal length from an intermediate position of the hollow portion length W to the center of gravity of the weight adjusting material The ratio (L / W) to the eccentric length L is 0.1 or more .
[0011]
According to a third aspect of the present invention, in the golf club according to any one of the first to third aspects, the weight adjusting member has a specific gravity of 0.8 to 5.0 and a total weight of 1 to 40 g. Head.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a golf club head (hereinafter sometimes simply referred to as “head”) 1 according to the present embodiment, in which a face surface 2 is inclined at a loft angle with respect to a vertical surface and forms a lower surface of the head 1. FIG. 2 is a plan view of a reference state in which the unit 4 (shown in FIG. 2) is placed on a horizontal plane, and FIG.
[0013]
In the figure, a head 1 according to this embodiment includes a face 2 that hits a ball and is given a predetermined loft angle, and a crown 3 that is connected to the upper edge of the face 2 and forms the upper surface of the head 1. A sole portion 4 that continues to the lower edge of the face surface 2 and forms the lower surface of the head 1, a side portion 5 (shown in FIG. 2) that extends between the crown portion 3 and the sole portion 4, and a shaft (not shown). The wood type thing comprised from the shaft attachment part 6 with which it mounts | wears is illustrated, and it is comprised with various materials, such as titanium, stainless steel, and aluminum alloy which are generally used conventionally.
[0014]
The head 1 of this embodiment has a hollow portion O therein, that have provided a partition wall 9 which partitions the hollow portion O into a plurality of hollow chambers. Partition wall 9, rather如shown in FIG. 2, from the inner surface 4a of the source Lumpur 4 rise and the face surface 2 back face to the toe side extending the toe t side toward the partition wall 9A and the heel-side extending heel h side nearer And a partition wall 9B .
[0015]
Due to the partition walls 9A and 9B, the hollow portion O of the present embodiment has a toe side hollow chamber Oa positioned on the toe t side with respect to the toe side partition wall 9A and a heel h side with respect to the heel side partition wall 9B. In this example, the heel side hollow chamber Ob positioned between the two and the hollow chamber Oc in one is partitioned into three.
[0016]
As shown in FIG. 2, an example is shown in which a weight adjusting material 7 is arranged in the toe side hollow chamber Oa in order to increase the moment of inertia of the head 1. For example, a thermoplastic material, which is fixed to the hollow chamber Oa so as to be immovable by being cured at room temperature, can be preferably used as the weight adjusting material 7. Here, “heating” means heating to a temperature higher than room temperature, for example, 50 ° C. or higher, more preferably 70 ° C. or higher.
[0017]
Such weight adjustment member 7, also weight that a flow state is heated in this example, in the present embodiment from the injection hole 10 is injected by the weight fraction required in, for example, the weight adjustment toe side hollow chamber Oa Since the adjusting material 7 is in a fluid state, it tends to flow toward the center of the head. However, the toe side partition wall 9A prevents the weight adjusting material 7 from flowing and stays on the toe t side of the toe side partition wall 9A. Can do. Thereafter, the weight adjusting material 7 is cured by natural or forced cooling to room temperature, and is fixed to the toe side hollow chamber Oa so as not to move. The weight adjusting material 7 may be in a fluid state inside the head 1 by heating the head 1 after filling the hollow chamber as powder or pellets.
[0018]
As a result, the weight of the head 1 can be accurately controlled to the target weight, and the position of the weight adjusting member 7 can be freely and easily set by partitioning the hollow portion by setting the shape or position of the partition wall 9 in various ways. Can be adjusted. Thus, “partitioning the hollow portion” by the partition means partitioning so that the weight adjusting material 7 can be positioned.
[0019]
Therefore, when adjusting the center of gravity position G of the head 1, for example, the conventional complicated operation of tilting the head 1 and maintaining the state until the weight adjusting material 7 actively flows and solidifies inside the head is required. This can greatly improve productivity. Further, in the head 1 of this embodiment, for example, as shown in FIG. 2, the weight adjusting material 7 can be disposed only on the toe t side and only on the sole portion 4 side. Furthermore, such a partition wall 9 is also effective in preventing the positional deviation after the weight adjusting material 7 is cured.
[0020]
The weight adjusting material 7 has a characteristic that the glass transition temperature (Tg) is 0 ° C. or lower, preferably −20 ° C. or lower, and the melting point is 50 ° C. or higher, as disclosed in, for example, JP-A-8-257174. What has is preferable. In particular, the pour point is 50 to 300 ° C, preferably 70 to 250 ° C. Further, it is preferable that the viscosity is 1000 cp or less at a temperature of 80 ° C. or higher and 2000 cp or higher at 70 ° C. or lower. Further, it is particularly preferable that the weight adjusting material 7 is chemically stable, hardly causes a chemical change, and does not change in quality even after repeated heating and cooling.
[0021]
The material of the weight adjusting material 7 satisfying such characteristics is not particularly limited, and examples thereof include compounds such as polyisobutene and polyisobutylene, ethers such as polyvinyl ether, and acrylic adhesives. It is done. More specifically, for example, “Tetrax” (polyisobutylene) or “Evertac” (polybutene) manufactured by Nippon Petrochemical Co., Ltd. is easy to handle and suitable.
[0022]
Note that if the specific gravity of the weight adjusting material 7 is too small, a large amount of use is required for adjusting the weight of the head and the adhesion to the hollow chamber may be deteriorated, and conversely, the specific gravity is too large. And delicate weight adjustment tends to be difficult. From such a viewpoint, the specific gravity of the weight adjusting material 7 is desirably set to, for example, about 0.8 to 5.0, and more preferably about 1.0 to 3.0. The weight adjusting agent 7 can appropriately adjust the specific gravity by including a metal powder having a large specific gravity, such as tungsten powder.
[0023]
The toe side hollow chamber Oa and the heel side hollow chamber Ob are each provided with an injection hole 10 for injecting the weight adjusting material 7 and an obturator 11 for closing the injection hole 10 . Each injection hole 10 is formed, for example, in the side portion 5 of the head 1 as a small hole communicating the outside with each of the hollow chambers Oa, Ob, and the weight adjusting material 7 is passed through the injection hole 10 to each of the hollow chambers Oa. Or it is thrown into Ob. In addition, the injection hole 10 can be sealed with the obturator 11 before or after curing after the weight adjusting material 7 is introduced. The obturator 11 is fixed to the head 1 by an appropriate fixing means such as an adhesive, brazing, welding, or the like that is screwed into the injection hole 10 or fixed by caulking. Various things can be adopted.
[0024]
Moreover, although not shown in figure, the weight adjustment material 7 can also be distribute | arranged only to the heel side hollow chamber Ob. In this case, since the position of the center of gravity of the head 1 is relatively closer to the heel h side, the moment of inertia around the shaft center line of the head 1 is reduced, which is preferable in terms of improving the so-called “return” of the head.
[0025]
Further, when the weight adjusting material 7 is arranged in the toe side hollow chamber Oa or the heel side hollow chamber Ob as described above, the toe side hollow has a cross section parallel to a vertical plane passing through the head center-of-gravity point G in the reference state. The hollow portion length W which is the horizontal length between the toe end t1 of the chamber Oa and the heel end h1 of the heel side hollow chamber Ob, and the center of gravity of the weight adjusting member 7 from the intermediate line P of the hollow portion length W The ratio (L / W) to the eccentric length L, which is the horizontal length up to g, is 0.1 or more, more preferably 0.15 or more, and still more preferably about 0.2 to 0.45. Is desirable. As a result, the center of gravity G of the head 1 is effectively transferred to the toe t side or the heel h side. When the center of gravity g of the weight adjusting material 7 does not appear in the section, the horizontal distance between the intermediate line P and the projected center of gravity g ′ passing through the center of gravity g and intersecting the section with a straight line intersecting the section is offset. Used as the core length L.
[0026]
Further, the hollow chamber in which the weight adjusting material 7 is arranged, in this example, the toe side hollow chamber Oa, has a center of gravity height Hg which is a height from the lowest position of the hollow chamber to the center of gravity g of the weight adjusting material 7. The ratio (Hg / H) of the toe side hollow chamber Oa to the maximum height H of the hollow portion, which is the height from the lowest position to the highest position, is set to 0.05 to 0.4. Accordingly, it is possible to provide the head 1 that helps to lower the center of gravity of the head 1 and can easily raise the ball.
[0028]
Figure 3 is a sectional view in FIG. 1 at the same position, are merely illustrative of the shape. The head 1 of this example includes a cylindrical partition wall portion 13 having a cylindrical shape in which the partition wall 9 rises from the inner surface 4 a of the sole portion 4 at a small height, and a disk-shaped partition wall portion 14 that closes the upper end of the cylindrical partition wall portion 13. What has been configured is illustrated. As a result, the hollow portion O of the head 1 is illustrated as being partitioned by the inner surface 4a of the sole portion 4, the sole-side hollow portion Od surrounded by the partition wall 9, and the remaining main hollow portion Oe. The sole portion 4 is provided with an injection hole 10 through which the weight adjusting material 7 can be put into the sole-side hollow portion Od, and an obturator 11 for closing the injection hole 10. Such a head 1 is preferable in that the lowering of the center of gravity of the head 1 is more effectively promoted.
[0029]
FIGS. 4A and 4B merely illustrate other forms .
In FIG. 3A, the partition wall 9 is exemplified by one that rises from the inner surface of the sole portion 4 and curves in a substantially U shape along the side portion. Thereby, the hollow part O is illustrated as being partitioned into the center-side hollow chamber Og and the peripheral hollow chamber Of of the head. Such a partition wall 9 can prevent the weight adjusting material 7 from flowing to the center side of the head 1 and can easily distribute a larger weight around the head 1, thereby increasing the moment of inertia. . Further, in FIG. 5B, the partition wall 9 is exemplified as one that rises from the inner surface of the sole portion 4 and has a substantially U shape on the back face B side. As a result, the hollow portion O is partitioned into the back face hollow chamber Oh and the remaining main hollow chamber Oi, and the weight adjusting material 7 is disposed in the back face side hollow chamber Oh so that the weight adjusting material 7 is 1 can be prevented from flowing to the center of the head 1, and more weight can be easily arranged around the back face of the head 1, which helps to increase the depth of the center of gravity.
[0030]
Although the embodiment of the present invention has been described in detail above, the present invention can be preferably applied to a golf club head having a volume of a hollow portion formed inside the head of, for example, about 10 to 300 cc, for example, an iron type having a hollow portion. It can be applied to a golf club head.
[0031]
Further, the partition wall 9 is exemplified as rising from the inner surface 4a of the sole portion 4 to the inner surface 3a of the crown portion 3, but the upper end of the partition wall 9 is formed depending on the amount of use of the weight adjusting material 7. It is also possible to configure the crown portion 3 so as to be separated from the inner surface 3a. Further, it goes without saying that the partition wall 9 can be variously modified such as a wall-like shape formed on the side portion 5 and a box shape hanging from the crown portion 3 in addition to the one rising from the inner surface of the sole portion 4.
[0032]
【Example】
The golf club heads shown in FIGS . 1 and 2 were prototyped ( Examples 1 and 2 ) and their performance was evaluated. Example 1 is shown in FIG. 2 using a weight adjusting material of 20 g, Example 2 has a partition wall shown in FIG. 2, and 20 g of weight adjusting material is arranged only on the heel side, Reference Example 1 is The partition wall shown in FIG. 3 was provided, and a 20 g weight adjusting material was disposed on the sole side. In Example 1 and Example 2, when the head center of gravity position was compared, a difference of about 2.8 mm was observed in the horizontal direction and the length direction of the face. Further, in the reference example 1 , the center of gravity of the head of about 1.2 mm was lowered as compared with the example 1.
[0033]
For comparison, the weight member X shown in FIG. 5 is screwed to the sole part (Comparative Example 1), and as shown in FIG. The test piece (Comparative Example 2) was also prototyped and a test hit test was conducted. In the trial hit test, a shaft is attached to each club head and attached to the swing robot. After hitting 1000 golf balls at the center of the face surface of each club at a head speed of 50 m / s, the head is disassembled and the inside is disassembled. I checked the condition. In each head, the face surface was made of aluminum and the others were made of titanium alloy, and the total volume of the hollow portion was 280 cc. Further, “Tetrax T3” (polyisobutylene) (specific gravity 1.0) manufactured by Nippon Petrochemical Co., Ltd. was used as the weight adjusting material. Metal powder is not blended. Table 1 shows the test results.
[0034]
[Table 1]

[0035]
As a result of the test, it was confirmed that Examples 1 to 3 were fixed to the hollow part even after the trial hit test and had good durability. In Comparative Example 1, the weight body joining bolt was broken, and the weight body was detached from the hollow portion of the head. In Comparative Example 2, the weight adjusting material moved to the toe side and was displaced.
[0036]
【The invention's effect】
As described above, in the invention according to the first aspect, the head weight is accurately managed to the target weight by arranging the weight adjusting material in the head in a necessary amount. Further, a partition wall for partitioning the hollow portion inside the head multiple hollow chambers provided by placing a weight adjusting material to check in the their, the partition wall at a predetermined position Shi stop flowing the weight adjusting material in a fluid state Can stay. Therefore, it is possible to adjust the fixed position of the weight adjusting material, thus, can be easily performed adjustment of the center of gravity of the head.
[0037]
Further, the hollow portion inside the head is located between the toe side hollow chamber located on the toe side with respect to the toe side partition, the heel side hollow chamber located on the heel side with respect to the heel side partition, and 1 therebetween. The center of gravity position can be shifted effectively by arranging the weight adjusting material in either the toe side hollow chamber or the heel side hollow chamber, so that the position of the center of gravity is closer to the head heel. It can be set more easily, such as near the toe or near the center . Further, by setting the ratio (Hg / H) to 0.05 to 0.4, it is possible to provide a head that helps to lower the center of gravity of the head 1 and can easily raise the ball.
[0038]
Further, as described in claim 2, the center of gravity position of the head can be set more effectively by limiting the position of the center of gravity of the weight adjusting material with respect to the inside of the head.
[Brief description of the drawings]
FIG. 1 is a plan view of a reference state of a head showing an embodiment of the invention.
FIG. 2 is a cross-sectional view taken along the line AA.
FIG. 3 is a cross-sectional view merely illustrating a case corresponding to the position AA in FIG. 1;
FIGS. 4A and 4B are perspective views simply showing another example. FIGS.
FIG. 5 is a cross-sectional view of a comparative head corresponding to the position AA in FIG. 1;
6A to 6C are cross-sectional views of a conventional head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Golf club head 2 Face surface 3 Crown part 4 Sole part 5 Side part 6 Shaft attachment part 7 Weight adjusting material 9 Partition 9A Toe side partition 9B Heel side partition 10 Injection hole 11 Closure O Hollow part Oa Toe side hollow chamber Ob Hollow chamber in the heel side hollow chamber Oc

Claims (3)

A golf club head having a hollow portion therein, provided with a partition that partitions the hollow portion into a plurality of hollow chambers,
The partition wall includes a toe side partition wall that rises from the inner surface of the sole portion and extends from the face surface side to the back face side toward the toe side, and a heel side partition wall that extends toward the heel side.
The hollow portion includes a toe side hollow chamber positioned on the toe side relative to the toe side partition wall, a heel side hollow chamber positioned on the heel side relative to the heel side partition wall, and one or more positioned therebetween. And a hollow chamber inside,
The toe side hollow chamber and the heel side hollow chamber include an injection hole for injecting a weight adjusting material and an obturator for closing the injection hole,
On one of the toe side hollow chamber or heel side hollow chamber, with a no flow condition and room temperature for distributing the immovably anchored by weight adjusting material in the hollow chamber by curing by heating,
In a cross section parallel to the vertical plane passing through the center of gravity of the head in a reference state in which the face surface is inclined at a loft angle with respect to the vertical plane and the sole portion is placed on a horizontal plane,
The hollow portion where the weight adjusting material is arranged has a center-of-gravity height Hg which is a height from the lowest position of the hollow portion to the center of gravity of the weight adjusting material, and a height from the lowest position to the highest position of the hollow portion. A golf club head characterized in that the ratio (Hg / H) to the maximum height H of the hollow portion is 0.05 to 0.4 . In a cross section parallel to the vertical plane passing through the center of gravity of the head in a reference state in which the face surface is inclined at a loft angle with respect to the vertical plane and the sole portion is placed on a horizontal plane,
A hollow portion length W which is a horizontal length between a toe end of the toe side hollow chamber and a heel end of the heel side hollow chamber;
The ratio (L / W) to an eccentric length L, which is a horizontal length from an intermediate position of the hollow portion length W to the center of gravity of the weight adjusting material, is 0.1 or more. 1. A golf club head according to 1. The golf club head according to claim 1, wherein the weight adjusting member has a specific gravity of 0.8 to 5.0 and a total weight of 1 to 40 g .

Images