JP2008200318A - Iron set of golf clubs - Google Patents
Iron set of golf clubs Download PDFInfo
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- JP2008200318A JP2008200318A JP2007040634A JP2007040634A JP2008200318A JP 2008200318 A JP2008200318 A JP 2008200318A JP 2007040634 A JP2007040634 A JP 2007040634A JP 2007040634 A JP2007040634 A JP 2007040634A JP 2008200318 A JP2008200318 A JP 2008200318A
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Abstract
Description
本発明は,ゴルフクラブのアイアンセットにおいて、Hw、L、Swを従来にない組み合わせにすることによって、ヘッドスピードの増大、ヘッドのターン性能の向上、スイング軌道の安定性の向上により、飛距離増大と方向安定性を向上させることである。
The present invention increases the flight distance by increasing the head speed, improving the turn performance of the head, and improving the stability of the swing trajectory by combining Hw, L, and Sw in an unprecedented combination in a golf club iron set. And to improve the directional stability.
従来のゴルフクラブのアイアンセットの中の#5アイアンにおいて、図1は、総重量Tw(以下Twとする)の軽いものから重いものまでをサンプルとして任意に抽出し、SwとTwの関係をプロットしたグラフであるが、SwとTwは、ほぼ1次式で表せる関係にある事が分かる。Twを計測すれば、Twは、Hw、Sw、グリップ重量Gw(以下Gwとする)の和であるので、図2に示すようにHwの平均値は257gで、標準偏差δ=2.1gの範囲にあった。すなわち、ばらつき幅±3δ(統計的には、99.7%が含まれる範囲)を考慮して場合、最も軽いと推定されるHwは、約250gである。ただし、過去に実売されたHwが、極めて軽いと思われるものとして、図4及び図5に示すクラブがあった。L=39.25inch、Hw=248gである。
一般的にゴルフクラブのHwは、長さが長くなると、振りやすさを適切にするために軽くなっている。クラブの中で最も長さが長い、ドライバーは、Hwがおよそ195〜205gである。これは、ボールとヘッドの衝突において重量と速度の積によって定義される運動量が飛距離の増大において、最も効率的に機能する重量になっている。アイアンのHwは、グリップ端から14インチの点を支点するモーメントを一定にすることで振りやすさを合わせるようにしたスイングバランス理論によって、ドライバーなど他のクラブと合わせるように従来から管理されてきたので、図2に示すようにHwは、前記の効率的な重量からすると平均Hw=257gと重い。 In general, the Hw of a golf club becomes lighter to make it easier to swing as the length increases. The longest driver in the club, Hw is approximately 195-205g. This is the weight at which the momentum defined by the product of the weight and the velocity in the collision between the ball and the head functions most efficiently when the flight distance increases. Iron Hw has traditionally been managed to match other clubs, such as drivers, using a swing balance theory that matches the ease of swinging by keeping the moment that supports the 14-inch point from the grip end constant. Therefore, as shown in FIG. 2, Hw is as heavy as average Hw = 257 g from the above-mentioned efficient weight.
飛距離を増大するためにはクラブを軽くすれば良いという考えから図3の(2)のようにSwを55gと軽くした仕様があるが、それも、Hwは、ほとんど変わらず、振りやすく思えるものの、長さが、ほとんど同じであるため、ヘッドスピードは、ほとんど上がらない。図5に示すように、すべての番手のヘッドスピードを同一試験者で調査した場合、Lとヘッドスピード(以下H/Sとする)は、ほぼ比例することがわかっている。Lが長くなれば、H/Sが増大する。 From the idea that the club should be lightened to increase the flight distance, there is a specification that lightens the Sw as 55g as shown in (2) of Fig. 3, but that Hw is almost unchanged and seems easy to swing. However, since the length is almost the same, the head speed hardly increases. As shown in FIG. 5, when the head speeds of all the counts are investigated by the same tester, it is known that L and the head speed (hereinafter referred to as H / S) are approximately proportional. As L becomes longer, H / S increases.
図3の(4)に示すものは、図5,6のクラブと同一である。長尺アイアンと呼ばれていたモデルである。振りやすさを確保するためにHw=248g と従来の軽くし、Lが長いので、H/Sの増大は、得られたが、Swを軽くし、振りやすさを得ていたため、手元が軽すぎて、ヘッドが、振り遅れやすかったり、スイングの安定性も低かった。また、ヘッドが遠心力で、地面の方に引っ張られるいわゆるトウダウンと呼ばれるシャフトのたわみ現象も大きく、飛距離と方向安定性の両方を達成するには至らなかった。 What is shown in (4) of FIG. 3 is the same as the club of FIGS. This model was called a long iron. In order to ensure ease of swinging, Hw = 248g, which is lighter than before and L is long, so an increase in H / S was obtained, but because Sw was lightened and ease of swinging was obtained, the hand was light. The head was too late to swing and the stability of the swing was too low. In addition, a shaft bending phenomenon called so-called toe-down, in which the head is pulled toward the ground by centrifugal force, is large, and it has not been possible to achieve both flight distance and directional stability.
本発明のアイアンクラブは、#5アイアンの仕様が、Hw≦235g、で、前記の数式で表される、MI≧2,600,000gcm2となるようにし、振りやすさを従来のクラブのレベルに保ちつつ、飛距離増大と方向安定性を向上させることである。 The iron club of the present invention is such that the specification of # 5 iron is Hw ≦ 235 g and expressed by the above formula, MI ≧ 2,600,000 gcm2, while maintaining ease of swinging at the level of the conventional club, It is to increase flight distance and improve directional stability.
クラブの振りやすさを比較するための、グリップ端を支点とするMIについて説明する。MIに影響を与える要因として、L、Hw、Sw、Gwがある。各要因のMIに対する影響の調査するために、実験計画法の直行表L9に前記の4つの要因を割り付けて、図9慣性モーメント測定装置を使って計測をした。
本実験は、文献2によって解説された手法である。
L9の割り付け表が図7である。各要因にそれぞれ3水準のレベルを設定する。テストNo.1〜9までの各要因の水準の組み合わせと結果の表が図8である。図9は、4つの要因の各水準の平均値から求めた主効果と、推定式である。Gwは、係数がゼロより小さいので、無視出来るものと判断する。
Lは、MI=(12.75×L-292.61)×10000
Swは、MI=(0.4×Sw+269.89)×10000
Hwは、MI=(1.3333×Hw+33.947)×10000
全平均は、293.89×10000
本結果から、推定されるMIは、次式で表される。単位は、gcm2である。
MI=((12.75×L-292.61)+(0.4×Sw+269.89)+(1.3333×Hw+33.947)-2×293.89) ×10000
MIによって、ゴルフクラブの振りやすさを判断することは、前記の要因が、ランダムに変化しても容易に計算で求めることができる。前記のバランス理論の場合、同じ長さ、同じバランス値のクラブでHwが重く、Swが軽いものと逆にHwが軽く、Swが重いものを比較した場合に、振りにくさが人によって全く判断が、異なることから、MIがゴルフクラブの振りやすさを判断するのに適切と考える。
Explains the MI with the grip end as a fulcrum for comparing the ease of swinging the club. Factors affecting MI include L, Hw, Sw, and Gw. In order to investigate the influence of each factor on the MI, the above four factors were assigned to the orthogonal design table L9 of the experimental design method, and measurement was performed using the inertia moment measuring device in FIG.
This experiment is the method described in Document 2.
The allocation table for L9 is shown in FIG. Three levels are set for each factor. FIG. 8 shows a table of combinations of the levels of the respective factors from the test Nos. 1 to 9 and the result. FIG. 9 shows the main effect obtained from the average value of each level of the four factors and the estimation formula. Gw judges that it can be ignored because the coefficient is smaller than zero.
L is MI = (12.75 × L-292.61) × 10000
Sw is MI = (0.4 × Sw + 269.89) × 10000
Hw is MI = (1.3333 × Hw + 33.947) × 10000
Total average is 293.89 × 10000
From this result, the estimated MI is expressed by the following equation. The unit is gcm2.
MI = ((12.75 × L-292.61) + (0.4 × Sw + 269.89) + (1.3333 × Hw + 33.947) -2 × 293.89) × 10000
Judging the ease of swinging a golf club by MI can be easily calculated even if the above factors change randomly. In the case of the balance theory described above, when comparing clubs of the same length and the same balance value with heavy Hw and light Sw, but with light Hw and heavy Sw, the difficulty of swinging is completely judged by the person. However, because they are different, MI considers it appropriate for judging the ease of swinging a golf club.
前記の図3に示した(1)から(4)の従来クラブのMIは、約2,600,000以上あり、小さすぎるとスイングが不安定となり、安定してボールを打てない。 The MI of the conventional clubs (1) to (4) shown in FIG. 3 is about 2,600,000 or more. If it is too small, the swing becomes unstable and the ball cannot be hit stably.
図10に、本発明の仕様を被験者2名によって、実際にボールを打って、計測した結果を示す。被験者A男性は、本発明クラブによって、ボール初速が、54.4m/secから56.9m/secまで増速し、飛距離もキャリーが、181.6yardから196.2yardに伸びている。着地後の転がりも含めたトータル飛距離は、188.8yardから204.3yardに伸びている。被験者B男性においても、Aと同様の効果が確認できた。 FIG. 10 shows the result of measuring the specification of the present invention by actually hitting a ball by two subjects. Subject A male increased the initial ball speed from 54.4 m / sec to 56.9 m / sec and the carry distance increased from 181.6 yards to 196.2 yards with the club of the present invention. The total flight distance including rolling after landing has increased from 188.8 yards to 204.3 yards. In subject B male, the same effect as A was confirmed.
図3において、本発明のクラブは(5)例1から(9)例5である。請求の範囲で示したHw≦235g において、ばらつきを考慮した中心値としてHwを230gとし、Lは、39.5インチで、従来のクラブの(1)〜(3)の長さ37.5〜38より1.5〜2インチ長い。また、Swも68〜120gまでの5段階での慣性モーメントを求めたが、MIは、26,000,000〜28,100,000と従来のクラブと同レベルの範囲に入っている。また、H=230gであっても、不適合と判断される仕様を(10)〜(13)に示す。(10)、(11)は、Swが55gの場合だが、MIが小さすぎて、スイングの安定性が確保できない。また、(12)は、前者と同じSw55gで、Lを40inchまで長くした仕様だが、Swが軽いために、振り遅れやすい。(13)は、Swを重くした場合だが、MIは、Lが38インチだと、従来のクラブと同レベルの範囲に入るもののH/Sの増大が得られない。本発明の適合性のある仕様は、組み合わせは多々考えられるが、(5)〜(9)の仕様となる。 In FIG. 3, the clubs of the present invention are (5) Example 1 to (9) Example 5. In Hw ≦ 235g shown in the claims, Hw is 230g as a center value considering variation, L is 39.5 inches, and 1.5 to 1.5 from the lengths 37.5 to 38 of the conventional clubs (1) to (3) 2 inches long. Also, Sw obtained the moment of inertia in 5 stages from 68 to 120 g, but MI was in the range of 26,000,000 to 28,100,000, the same level as the conventional club. Also, even if H = 230 g, specifications that are determined to be nonconforming are shown in (10) to (13). (10) and (11) are when Sw is 55g, but MI is too small to ensure swing stability. Also, (12) is the same Sw55g as the former, and the length is up to 40 inches. However, because Sw is light, it is easy to delay. (13) is a case where Sw is heavy, but MI is in the same level range as conventional clubs when L is 38 inches, but H / S cannot be increased. Although there are many possible combinations of compatible specifications of the present invention, the specifications are (5) to (9).
請求の範囲においてL、Hw、Swは色々な組み合わせが考えられるが、図3の本発明の仕様(5)〜(9)が代表的な例である。MIの大きさは、体力によって、選択できる。体力の小さい人はMIの小さい方を選択する。 In the claims, various combinations of L, Hw, and Sw are conceivable, but the specifications (5) to (9) of the present invention in FIG. 3 are typical examples. The size of MI can be selected according to physical strength. People with small physical strength choose the one with the smaller MI.
Claims (1)
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JP2007040634A JP4606428B2 (en) | 2007-02-21 | 2007-02-21 | Golf club iron set |
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JP2007040634A JP4606428B2 (en) | 2007-02-21 | 2007-02-21 | Golf club iron set |
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JP4606428B2 JP4606428B2 (en) | 2011-01-05 |
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Citations (2)
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JP2000317017A (en) * | 1999-05-11 | 2000-11-21 | Uchiyama Mitsuko | Golf club set |
JP2005511169A (en) * | 2001-11-30 | 2005-04-28 | フィール ゴルフ エルエルシー | Elongated golf club grip |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2000317017A (en) * | 1999-05-11 | 2000-11-21 | Uchiyama Mitsuko | Golf club set |
JP2005511169A (en) * | 2001-11-30 | 2005-04-28 | フィール ゴルフ エルエルシー | Elongated golf club grip |
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