JP4205817B2 - Golf club head - Google Patents

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Publication number
JP4205817B2
JP4205817B2 JP23463599A JP23463599A JP4205817B2 JP 4205817 B2 JP4205817 B2 JP 4205817B2 JP 23463599 A JP23463599 A JP 23463599A JP 23463599 A JP23463599 A JP 23463599A JP 4205817 B2 JP4205817 B2 JP 4205817B2
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Japan
Prior art keywords
face member
thickness
reinforcing plate
face
head
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JP23463599A
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JP2001058015A (en
Inventor
輝明 関
宏 寺岡
泰範 今本
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Bridgestone Sports Co Ltd
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Bridgestone Sports Co Ltd
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【０００１】
【発明の属する技術分野】
この発明は、フェース部材をヘッド本体とは別部材で形成しておき、ヘッド本体の開口縁にフェース部材の後方延出部の端部を固着し、このフェース部材を二重構造にしたゴルフクラブヘッドに関する。
【０００２】
【従来の技術】
従来、フェース部材を二重構造にしたものとして、特開平１１−１１４１０５号公報に記載のものが知られている。これは、２枚の板状部材を、間に狭い空間が形成されるように、それぞれの外周部同士を溶接し、この２枚溶接部材（フェースユニット）をヘッド本体の開口部に嵌め込んで溶接するものである。このフェースユニットの夫々の板材の板厚を、１．５〜２．０ｍｍの薄さにしても強度や耐久性が確保され、飛距離も向上させることができるとされている。また、フェースユニットの表板（インパクト側）と裏板（バックアップ側）の関係は、打球時に表板が背方に反り変形した後に原形状に復帰するときには、表板によって押されて背方へ反り変形している裏板が表板を前方へ押しながら原形状に復帰する関係なので、２枚の板（表裏板）の反発力をボールに付与して飛距離を伸ばす、とされている。
【０００３】
【発明が解決しようとする課題】
従来のフェース二重構造ヘッドでは、表裏２枚の板の外周部を溶接するが、このとき溶接に伴ってビードが生じ、このビードを切削や研磨によってヘッド本体の開口部の輪郭に合うように仕上げなくてはならない。また、このように仕上げたフェースユニットのヘッド本体開口部への固着が、開口部の口縁部に裏板（バックアップ部材）の外周縁を溶接することにより行なわれているため、口縁部の寸法とフェースユニットの外周縁の寸法とが正確に合わないと溶接できない部分が生じたりすることがあった。
【０００４】
そこで、この発明は、フェース部材のヘッド本体への固着を容易かつ確実にし、フェース二重構造で飛距離増大を図ったゴルフクラブヘッドを提供することを目的とする。
【０００５】
【課題を解決するための手段】
上述の目的を達成するため、この発明は、前方が開口した中空金属製殻体のヘッド本体の開口縁にフェース部材を固着してなるゴルフクラブヘッドであって、打球面外周縁を後方に延出させた延出部を有するフェース部材を１．０〜２．５ｍｍの厚みに鍛造しあるいは圧延して形成し、このフェース部材の打球面裏面に厚さ１．０〜２．５ｍｍに鍛造若しくは圧延して形成された補強板を重ね合わせその外周縁を固着し、ヘッド本体の開口縁にフェース部材の延出部の端部を固着し、前記フェース部材の打球面のロール半径を２５０〜３００ｍｍの範囲内とし、補強板のロール半径を打球面のロール半径より５０ｍｍ以上大きくしたものである。
【０００６】
【発明の実施の形態】
以下に、この発明の好適な実施例を図面を参照にして説明する。
【０００７】
図１はフェース部材１と補強板４とを示し、フェース部材１はボールを打つ打球面２の外周縁を後方に延出させた延出部３を有している。このフェース部材１の打球面２の裏面２Ａにほぼひとまわり小さい補強板４の外周縁を固着する。固着方法としては、補強板４の外周縁を裏面２Ａにアーク溶接すればよい（図３参照、符号１０は溶接部を示す）。この実施例では、延出部３はホーゼル７に当接する部分には形成されていない。
【０００８】
図２は、図１に示す二重構造としたフェース部材１をヘッド本体５に固着した状態、すなわち完成されたゴルフクラブヘッドの断面図である。ヘッド本体５は中空金属製殻体であり、前方が開口し、この開口縁６に延出部３の端部３Ａをアーク溶接してある。また、ヘッド本体５にはシャフト挿入用のホーゼル７が一体成形してあり、ソール８の内側にはウェート部材９を固着してある。
【０００９】
フェース部材１は、ステンレス鋼、マルエージング鋼、アルミニウム合金、チタニウム合金などの金属材料を鍛造あるいは圧延して厚さ１．０ｍｍから２．５ｍｍの範囲内に形成したものである。このフェース部材１の素材２０を図４に示す。この素材２０は鍛造若しくは圧延して成形され、図面上点線で示す箇所を折り曲げ加工して図１に示すように延出部３を形成する。また、この素材２０の打球面２となる箇所にプレス加工，鍛造加工，彫刻によって溝部となるスコアライン（図示せず）を形成しておく。また、延出部３を折り曲げ加工するときに、材料自体の塑性変形によって打球面２が所定のロールおよびバルジを有するように成形する。この打球面２のロール半径は２５０〜３５０ミリの範囲内とする。このようなロール半径をもった打球面２の裏面２Ａに固着される補強板４のロール半径は、打球面２のロール半径より５０ｍｍ以上大きくするのが好ましい。このように補強板４のロール半径を打球面２のロール半径より５０ｍｍ以上大きくすることにより、打球面２の裏面２Ａと補強板４との間に隙間（図５参照）が形成されることとなる。
【００１０】
前記補強板４は、フェース部材１と同様にステンレス鋼、マルエージング鋼、アルミニウム合金、チタニウム合金などの金属材料を鍛造成形しあるいは圧延成形した厚さ１．０〜２．５ｍｍのものを用いる。この補強板４の打球面２の裏面２Ａへの固着は、図３ではその外周縁の全周にわたって溶接部１０を形成するように溶接したが、補強板４の外周縁の中心部を対称に上下もしくは左右に溶接部１０を形成することもできる。例えば、溶接部１０を上下に２箇所とした場合、１箇所の溶接は少なくとも３０ｍｍ以上、１００ｍｍ以下とする。溶接部１０の範囲が少ないと打球面２がインパクト時に変形して補強板４に押し当たった場合、補強板４がはずれる可能性が生ずる。図３に示すように、補強板４の外周縁の全周を溶接すると、打球面２側に重量が偏りすぎたり、ヘッド全体の重量が重くなってしまう恐れもある。そのため、補強板４に複数個の孔を開け、フェース部材１側における重量の軽減を図ることもできる。
【００１１】
この発明のゴルフクラブヘッドは、ドライバーのヘッドとして好適であり、図２に示すようなドライバーヘッドに構成したとき、ヘッド本体５及びフェース部材１を形成する金属材料としては、ヘッド体積を大きくするために比重の小さい材料、即ち比重５以下の材料が好ましい。ヘッド体積としては２３０ｃｃ以上、特に２５０ｃｃ以上とし、３５０ｃｃを限度とするものである。クラブ長さは、４４インチ以上５０インチ以下とする。このときのヘッド重量は、１７５ｇ〜２０５ｇの範囲内が好ましい。また、重心深さが浅いとボールに適度なバックスピンをかけられないので、重心の深さを２５ｍｍ以上とするのが好ましい。そのためにウェート部材９を設ける。重心深さと重心高さについては、図８に示す。
【００１２】
図５は、ヘッド本体５とフェース部材１とを溶接する箇所の拡大断面であり、ヘッド本体５の開口縁６の厚みを延出部３の端部３Ａの厚みの０．５〜１．５倍とするのが好ましい。端部３Ａの厚さは１．０ｍｍ〜３．０ｍｍが好ましく、この端部３Ａは全周にわたってほぼ均一な厚さとすることが好ましい。端部３Ａの厚さが１ｍｍ未満となると、溶接によりヒケが生じたりして溶接しにくくなる。また３ｍｍを超える厚さにすると、フェース部材１の重量が重くなるので好ましくない。なお、開口縁６の厚さをヘッド本体５の開口縁以外の部分の厚さよりも厚くし、端部３Ａの厚さをフェース部材１の他の部分よりも厚くしておくことにより、溶接によるヒケによって部分的に薄くなり強度低下をおこすことを予防することができる。
【００１３】
図６に示す実施例では、ホーゼル７を別個に製造しておき、このホーゼル７にヘッド本体５及びフェース部材１を溶接するようにしてある。
【００１４】
図７のフェース部材１は、打球面２の裏側に凹所２Ｂを形成した例を示す。従って、この凹所２Ｂが形成された箇所の打球面２の厚さは１．０〜２．０ｍｍが好適であり、１．２〜１．５ｍｍが更に良い。更に、凹部２Ｂの外周部２Ｃは、フェース部２に補強材４を溶接する際、ひけが生じ易く、溶接する箇所である外周部２Ｃを厚くすることが好ましい。この外周部２Ｃは、延出部３に沿って形成されていることが好ましく、外周部２Ｃの厚みは、凹部２Ｂより０．２〜０．６ｍｍ程度厚いことが好ましく、幅は、１〜５ｍｍが良い。
【００１５】
図８には、クラブヘッドにおける重心深度と重心高さを説明する図である。Ｇは重心位置を示す。
【００１６】
ヘッド本体５を鋳造の６Ａｌ−４Ｖ−Ｔｉ合金で成形し、フェース部材１と溶接する部分の開口縁６の厚さを２．０ｍｍとし、この２．０ｍｍの厚さの範囲は後方に２．０ｍｍまでとし、それより後方のヘッド本体５の厚みはさらに薄くした。フェース部材１は厚さ２．０ｍｍのチタニウム合金の圧延材（ＳＰ７００）を、所望の形に打ち抜き、その後プレス成形により打球面２及び延出部３を成形した。打球面２にはスコアラインが刻設され、ロール半径３００ｍｍ、バルジ半径３００ｍｍに成形した。このときのフェース幅は４８ｍｍであり、そのヘッドの中心部を長径６０ｍｍ、短径４０ｍｍ、深さ０．３ｍｍの楕円凹部２Ｂを形成した。また、裏面２Ａには打球面２よりおよそ５．０ｍｍ程度小さくした補強板４をフェース部材１と同様の圧延材（ＳＰ７００）を用い、プレス加工し、ロール半径３５０ｍｍ、バルジ半径３５０ｍｍに成形した。この補強板４を打球面２の裏面２Ａに重ね合わせ、補強板４の外周縁を裏面２Ａにアルゴン雰囲気中でアーク溶接した。このときの溶接位置は、打球面２の裏面２Ａの上下とし、上部幅５０ｍｍ、下部幅８０ｍｍで溶接した。裏面２Ａと補強板４との隙間は最大でおよそ１．３ｍｍとなった。このようなヘッドを装着した本発明実施例のドライバーと、一般のドライバーとの試打の結果を比較してみた。このときの本発明実施例と比較するクラブとの詳細は表１に示すとおりである。そして試打の評価結果は表２に示すとおりである。
【００１７】
【表１】

Figure 0004205817
【００１８】
【表２】
Figure 0004205817
【００１９】
この試打評価結果に示すミート率は、ボール初速の数値をヘッドスピードの数値で割った値である。
【００２０】
【発明の効果】
以上説明したように、この発明によれば、前方が開口した中空金属製殻体のヘッド本体の開口縁にフェース部材を固着してなるゴルフクラブヘッドであって、打球面外周縁を後方に延出させた延出部を有するフェース部材を１．０〜２．５ｍｍの厚みに鍛造しあるいは圧延して形成し、このフェース部材の打球面裏面に厚さ１．０〜２．５ｍｍに鍛造若しくは圧延して形成された補強板を重ね合わせその外周縁を固着し、ヘッド本体の開口縁にフェース部材の延出部の端部を固着し、前記フェース部材の打球面のロール半径を２５０〜３００ｍｍの範囲内とし、補強板のロール半径を打球面のロール半径より５０ｍｍ以上大きくしたので、飛距離が向上するとともに、打球面を広くすることができ、スィートエリアの拡大を図ることが容易に行える。また、ヘッド本体の開口縁にフェース部材の延出部の端部を固着するので、アーク溶接などにより容易かつ確実に固着することができる。また、補強板のロール半径を打球面のロール半径より５０ｍｍ以上大きくすることにより、打球面の裏面と補強板との間に隙間が形成されることとなる。
【図面の簡単な説明】
【図１】二重のフェースを構成する部材の斜視図。
【図２】ヘッドの中央縦断面図。
【図３】打球面の裏面に補強板を溶接した状態の平面略図。
【図４】フェース部材の素材を示す斜視図。
【図５】ヘッド本体とフェース部材との溶接箇所の一部拡大断面図。
【図６】他の実施例を示す斜視図。
【図７】フェース部材の裏面に凹部を形成した例を示す斜視図。
【図８】ヘッドにおける重心深度と重心高さの説明図。
【符号の説明】
１ フェース部材
２ 打球面
２Ａ 裏面
３ 延出部
３Ａ 端部
４ 補強板
５ ヘッド本体
６ 開口縁[0001]
BACKGROUND OF THE INVENTION
According to the present invention, the face member is formed by a member different from the head body, the end of the rearward extending portion of the face member is fixed to the opening edge of the head body, and the face member has a double structure. Regarding the head.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a face member having a double structure is disclosed in JP-A-11-114105. The two plate-like members are welded to each other so that a narrow space is formed between them, and the two-piece welded members (face units) are fitted into the openings of the head body. Welding. It is said that even if the plate thickness of each plate of the face unit is 1.5 to 2.0 mm, strength and durability are ensured and the flight distance can be improved. The relationship between the face unit's front plate (impact side) and back plate (backup side) is that when the front plate returns to its original shape after being warped and deformed when hitting the ball, it is pushed back by the front plate. Since the warped and deformed back plate returns to the original shape while pushing the front plate forward, the repulsive force of the two plates (front and back plates) is applied to the ball to increase the flight distance.
[0003]
[Problems to be solved by the invention]
In the conventional face double structure head, the outer peripheral portions of the two front and back plates are welded, and at this time, a bead is generated along with the welding, and this bead is fitted to the contour of the opening of the head body by cutting or polishing. It must be finished. Further, the face unit finished in this way is fixed to the head body opening by welding the outer peripheral edge of the back plate (backup member) to the mouth edge of the opening. In some cases, a portion that cannot be welded may be formed unless the size and the size of the outer peripheral edge of the face unit exactly match each other.
[0004]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a golf club head in which the face member is easily and reliably fixed to the head body, and the flight distance is increased by a face double structure.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a golf club head in which a face member is fixed to an opening edge of a head body of a hollow metal shell having an opening at the front, and an outer peripheral edge of a ball striking surface extends backward. A face member having an extended portion is formed by forging or rolling to a thickness of 1.0 to 2.5 mm, and the face member is forged to a thickness of 1.0 to 2.5 mm on the backside of the ball striking surface. The reinforcing plate formed by rolling is superposed and the outer peripheral edge thereof is fixed, the end of the extending portion of the face member is fixed to the opening edge of the head body, and the roll radius of the hitting surface of the face member is 250 to 300 mm. The roll radius of the reinforcing plate is 50 mm or more larger than the roll radius of the ball striking surface .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0007]
FIG. 1 shows a face member 1 and a reinforcing plate 4, and the face member 1 has an extended portion 3 in which the outer peripheral edge of a ball striking surface 2 for hitting a ball extends backward. The outer peripheral edge of the reinforcing plate 4 that is slightly smaller than the back surface 2A of the hitting surface 2 of the face member 1 is fixed. As a fixing method, the outer peripheral edge of the reinforcing plate 4 may be arc-welded to the back surface 2A (see FIG. 3, reference numeral 10 indicates a welded portion). In this embodiment, the extending portion 3 is not formed in a portion that contacts the hosel 7.
[0008]
FIG. 2 is a cross-sectional view of a completed golf club head in a state where the face member 1 having a double structure shown in FIG. 1 is fixed to the head body 5. The head body 5 is a hollow metal shell, and the front is open, and the end 3 </ b> A of the extension 3 is arc welded to the opening edge 6. Further, a hosel 7 for shaft insertion is formed integrally with the head body 5, and a weight member 9 is fixed inside the sole 8.
[0009]
The face member 1 is formed by forging or rolling a metal material such as stainless steel, maraging steel, aluminum alloy, titanium alloy or the like within a thickness range of 1.0 mm to 2.5 mm. The material 20 of the face member 1 is shown in FIG. This material 20 is formed by forging or rolling, and a portion indicated by a dotted line in the drawing is bent to form an extension portion 3 as shown in FIG. In addition, a score line (not shown) serving as a groove portion is formed in a portion of the material 20 where the striking surface 2 is formed by pressing, forging, or engraving. Further, when the extending portion 3 is bent, the ball striking face 2 is shaped to have a predetermined roll and bulge by plastic deformation of the material itself. The roll radius of the hitting surface 2 is in the range of 250 to 350 mm. It is preferable that the roll radius of the reinforcing plate 4 fixed to the back surface 2A of the ball striking surface 2 having such a roll radius is larger than the roll radius of the ball striking surface 2 by 50 mm or more. Thus, by making the roll radius of the reinforcing plate 4 50 mm or more larger than the roll radius of the ball striking surface 2, a gap (see FIG. 5) is formed between the back surface 2A of the ball striking surface 2 and the reinforcing plate 4. Become.
[0010]
Similar to the face member 1, the reinforcing plate 4 is made of a metal material such as stainless steel, maraging steel, aluminum alloy, titanium alloy and the like having a thickness of 1.0 to 2.5 mm formed by forging or rolling. The reinforcing plate 4 is fixed to the rear surface 2A of the striking surface 2 in FIG. 3 by welding so as to form the welded portion 10 over the entire circumference of the outer peripheral edge, but the central portion of the outer peripheral edge of the reinforcing plate 4 is symmetrical. The welded portion 10 can also be formed vertically or horizontally. For example, when the welded portion 10 has two locations in the vertical direction, the welding at one location is at least 30 mm and at most 100 mm. If the range of the welded portion 10 is small, there is a possibility that the reinforcing plate 4 will come off when the striking surface 2 is deformed at the time of impact and is pressed against the reinforcing plate 4. As shown in FIG. 3, if the entire outer periphery of the reinforcing plate 4 is welded, the weight may be excessively biased toward the ball striking surface 2 or the entire head may become heavy. Therefore, a plurality of holes can be formed in the reinforcing plate 4 to reduce the weight on the face member 1 side.
[0011]
The golf club head of the present invention is suitable as a driver's head. When configured as a driver head as shown in FIG. 2, the metal material forming the head body 5 and the face member 1 is used to increase the head volume. A material having a small specific gravity, that is, a material having a specific gravity of 5 or less is preferable. The head volume is 230 cc or more, particularly 250 cc or more, and the limit is 350 cc. The club length is not less than 44 inches and not more than 50 inches. The head weight at this time is preferably in the range of 175 g to 205 g. Further, if the depth of the center of gravity is shallow, an appropriate backspin cannot be applied to the ball, and therefore the depth of the center of gravity is preferably 25 mm or more. For this purpose, a weight member 9 is provided. FIG. 8 shows the center of gravity depth and the center of gravity height.
[0012]
FIG. 5 is an enlarged cross-sectional view of a location where the head main body 5 and the face member 1 are welded, and the thickness of the opening edge 6 of the head main body 5 is 0.5 to 1.5 of the thickness of the end portion 3A of the extending portion 3. It is preferable to double. The thickness of the end portion 3A is preferably 1.0 mm to 3.0 mm, and the end portion 3A preferably has a substantially uniform thickness over the entire circumference. If the thickness of the end portion 3A is less than 1 mm, welding may cause sink marks, making it difficult to weld. On the other hand, if the thickness exceeds 3 mm, the weight of the face member 1 increases, which is not preferable. By making the thickness of the opening edge 6 thicker than that of the portion other than the opening edge of the head body 5 and by making the thickness of the end portion 3A thicker than other portions of the face member 1, it is possible to It is possible to prevent a reduction in strength due to partial thinning due to sink marks.
[0013]
In the embodiment shown in FIG. 6, the hosel 7 is manufactured separately, and the head body 5 and the face member 1 are welded to the hosel 7.
[0014]
The face member 1 shown in FIG. 7 shows an example in which a recess 2B is formed on the back side of the ball striking face 2. Accordingly, the thickness of the ball striking face 2 where the recess 2B is formed is preferably 1.0 to 2.0 mm, and more preferably 1.2 to 1.5 mm. Furthermore, the outer peripheral portion 2C of the concave portion 2B is likely to sink when the reinforcing material 4 is welded to the face portion 2, and it is preferable that the outer peripheral portion 2C, which is a portion to be welded, is thickened. The outer peripheral portion 2C is preferably formed along the extended portion 3, and the thickness of the outer peripheral portion 2C is preferably about 0.2 to 0.6 mm thicker than the concave portion 2B, and the width is 1 to 5 mm. Is good.
[0015]
FIG. 8 is a diagram for explaining the center of gravity depth and the center of gravity height of the club head. G indicates the position of the center of gravity.
[0016]
The head body 5 is formed of a cast 6Al-4V-Ti alloy, and the thickness of the opening edge 6 of the portion to be welded to the face member 1 is set to 2.0 mm. The thickness was set to 0 mm, and the thickness of the head body 5 at the back of the head was further reduced. For the face member 1, a rolled material (SP700) of a titanium alloy having a thickness of 2.0 mm was punched into a desired shape, and then the ball striking face 2 and the extending portion 3 were formed by press molding. A score line was engraved on the hitting surface 2 and formed into a roll radius of 300 mm and a bulge radius of 300 mm. The face width at this time was 48 mm, and an elliptical recess 2B having a major axis of 60 mm, a minor axis of 40 mm, and a depth of 0.3 mm was formed at the center of the head. On the back surface 2A, a reinforcing plate 4 that is about 5.0 mm smaller than the ball striking face 2 was pressed using the same rolled material (SP700) as the face member 1, and formed into a roll radius of 350 mm and a bulge radius of 350 mm. The reinforcing plate 4 was superposed on the back surface 2A of the ball striking surface 2, and the outer peripheral edge of the reinforcing plate 4 was arc welded to the back surface 2A in an argon atmosphere. The welding positions at this time were above and below the back surface 2A of the ball striking face 2, and were welded with an upper width of 50 mm and a lower width of 80 mm. The maximum gap between the back surface 2A and the reinforcing plate 4 was about 1.3 mm. A comparison was made between the results of trial hits between a driver of the embodiment of the present invention equipped with such a head and a general driver. The details of the clubs to be compared with the embodiment of the present invention are as shown in Table 1. The evaluation results of the test hits are as shown in Table 2.
[0017]
[Table 1]
Figure 0004205817
[0018]
[Table 2]
Figure 0004205817
[0019]
The meet rate shown in the test hit evaluation result is a value obtained by dividing the initial ball speed value by the head speed value.
[0020]
【The invention's effect】
As described above, according to the present invention, a golf club head in which a face member is fixed to an opening edge of a head body of a hollow metal shell having an opening at the front, the outer peripheral edge of the ball striking surface extends backward. A face member having an extended portion is formed by forging or rolling to a thickness of 1.0 to 2.5 mm, and the face member is forged to a thickness of 1.0 to 2.5 mm on the back surface of the ball striking surface. superposing the reinforcing plate formed by rolling and fixing the outer peripheral edge thereof, solid and wear end of the extending portion of the face member to the opening edge of the head body, 250 a roll radius of the ball striking face of the face member Since the roll radius of the reinforcing plate is 50 mm or more larger than the roll radius of the ball striking surface within the range of 300 mm , the flight distance is improved and the ball striking surface can be widened, making it easy to expand the sweet area In Obtain. Further, since the end of the extended portion of the face member is fixed to the opening edge of the head body, it can be easily and reliably fixed by arc welding or the like. Further, by making the roll radius of the reinforcing plate 50 mm or more larger than the roll radius of the ball striking surface, a gap is formed between the back surface of the ball striking surface and the reinforcing plate.
[Brief description of the drawings]
FIG. 1 is a perspective view of members constituting a double face.
FIG. 2 is a central longitudinal sectional view of a head.
FIG. 3 is a schematic plan view showing a state in which a reinforcing plate is welded to the back surface of the ball striking surface.
FIG. 4 is a perspective view showing a material of a face member.
FIG. 5 is a partially enlarged cross-sectional view of a welded portion between a head main body and a face member.
FIG. 6 is a perspective view showing another embodiment.
FIG. 7 is a perspective view showing an example in which a recess is formed on the back surface of the face member.
FIG. 8 is an explanatory diagram of the depth of the center of gravity and the height of the center of gravity in the head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Face member 2 Hitting surface 2A Back surface 3 Extension part 3A End part 4 Reinforcement board 5 Head main body 6 Opening edge

Claims (4)

前方が開口した中空金属製殻体のヘッド本体の開口縁にフェース部材を固着してなるゴルフクラブヘッドであって、
打球面外周縁を後方に延出させた延出部を有するフェース部材を１．０〜２．５ｍｍの厚みに鍛造しあるいは圧延して形成し、
このフェース部材の打球面裏面に厚さ１．０〜２．５ｍｍに鍛造若しくは圧延して形成された補強板を重ね合わせその外周縁を固着し、
ヘッド本体の開口縁にフェース部材の延出部の端部を固着し、
前記フェース部材の打球面のロール半径を２５０〜３００ｍｍの範囲内とし、補強板のロール半径を打球面のロール半径より５０ｍｍ以上大きくしたことを特徴とするゴルフクラブヘッド。A golf club head in which a face member is fixed to an opening edge of a head body of a hollow metal shell having a front opening,
A face member having an extended portion with the outer peripheral edge of the ball striking surface extending rearward is formed by forging or rolling to a thickness of 1.0 to 2.5 mm,
A reinforcing plate formed by forging or rolling to a thickness of 1.0 to 2.5 mm is laminated on the back surface of this face member and the outer peripheral edge thereof is fixed.
The end of the extended part of the face member is fixed to the opening edge of the head body ,
A golf club head, wherein a roll radius of the hitting surface of the face member is in a range of 250 to 300 mm, and a roll radius of the reinforcing plate is set to be 50 mm or more larger than a roll radius of the hitting surface . 前記補強板の外周縁の全周ではなく複数箇所をフェース部材の打球面裏面に溶接してあることを特徴とする請求項１に記載のゴルフクラブヘッド。  2. The golf club head according to claim 1, wherein a plurality of portions, not the entire circumference of the outer peripheral edge of the reinforcing plate, are welded to the back surface of the hitting surface of the face member. 前記ヘッド本体を鋳造成形し、その開口縁の厚みをフェース部材の延出部の端部の厚みの０．５〜１．５倍としたことを特徴とする請求項１又は２に記載のゴルフクラブヘッド。  3. The golf according to claim 1, wherein the head body is cast and the thickness of the opening edge is 0.5 to 1.5 times the thickness of the end portion of the extending portion of the face member. Club head. 前記フェース部材の打球面中心の肉厚を延出部の肉厚より薄く形成したことを特徴とする請求項１ないし３のいずれか１項に記載のゴルフクラブヘッド。The golf club head according to any one of claims 1 to 3, characterized in that the wall thickness of the ball striking face center of the face member formed thinner than the thickness of the extending portion.
JP23463599A 1999-08-20 1999-08-20 Golf club head Expired - Fee Related JP4205817B2 (en)

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