JP2012090730A - Shaft set for golf club and iron set - Google Patents

Shaft set for golf club and iron set Download PDF

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JP2012090730A
JP2012090730A JP2010239897A JP2010239897A JP2012090730A JP 2012090730 A JP2012090730 A JP 2012090730A JP 2010239897 A JP2010239897 A JP 2010239897A JP 2010239897 A JP2010239897 A JP 2010239897A JP 2012090730 A JP2012090730 A JP 2012090730A
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shaft
region
reinforcing
sheet
bending rigidity
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Hiroyuki Suzuki
浩之 鈴木
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Globeride Inc
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Globeride Inc
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Abstract

PROBLEM TO BE SOLVED: To provide a shaft set for a golf club that one can swing in a state closer to the same timing.SOLUTION: In the shaft set for a golf club including a shaft 12 for each golf-club number, the shaft includes the middle section MS where flexural rigidity increases from the tip side to the back end side within a range of 25 to 60% of the total length from a side of a tip 12a for each golf-club number, the front section FS that is at the tip side of the middle section and increases in flexural rigidity toward the tip side, and a back section BS that is at the back end side of the middle section and increases in flexural rigidity toward the back end side. Flexural rigidity distribution from the tip side to the back end side of the middle section is nearly identical for all golf-number clubs. In the back section, the rate of increase in flexural rigidity increases as compared with that of the front section as the golf-club number increases.

Description

この発明は、例えばゴルフクラブに用いられるゴルフクラブ用シャフトセット及びアイアンセットに関する。   The present invention relates to a golf club shaft set and an iron set used for a golf club, for example.

例えば特許文献１は、長さが異なってもスイングのタイミングを取り易い曲げ剛性の分布を有するように、シャフトの先端から６００ｍｍから８００ｍｍの曲げ剛性値の変化量を、長いシャフトを有するクラブほど小さくしている。   For example, in Patent Document 1, the amount of change in the bending stiffness value from 600 mm to 800 mm from the tip of the shaft is smaller for a club having a long shaft so as to have a bending stiffness distribution that allows easy swing timing even if the lengths are different. is doing.

特開２０１０−１５４８７５号公報JP 2010-154875 A

しかし、シャフトの先端から後端に移動するにしたがって曲げ剛性を増加させ、シャフト長さが長いクラブほど先端側（ヘッド側）の剛性を大きく、シャフト長さが短いクラブほど先端側の剛性を小さくしているので、先端部においてスイング時の撓りに差が生じ、その差をスイングのタイミングを変えて対応する必要が生じる。また、先端部近傍の曲げ剛性の値の変化量が小さいため、撓りを感じにくく、打球が安定し難いクラブセット（シャフトセット）となる可能性がある。   However, the bending rigidity increases as the shaft moves from the front end to the rear end. The longer the shaft length, the higher the rigidity on the front end side (head side), and the shorter the shaft length, the lower the rigidity on the front end side. Therefore, a difference occurs in bending at the time of the swing at the tip, and it is necessary to deal with the difference by changing the timing of the swing. Further, since the amount of change in the value of the bending stiffness in the vicinity of the tip is small, there is a possibility that a club set (shaft set) in which it is difficult to feel bending and a hit ball is difficult to stabilize.

この発明は、このような課題を解決するためになされたもので、より同一のタイミングに近づけた状態でスイング可能なゴルフクラブ用シャフトセット及びアイアンセットを提供することにある。   The present invention has been made to solve such problems, and it is an object of the present invention to provide a golf club shaft set and an iron set that can be swung in a state closer to the same timing.

上記課題を解決するために、本発明に係る、シャフトを番手ごとに有するゴルフクラブ用のシャフトセットであって、前記シャフトは、各番手共に、先端側から全長の２５〜６０％の範囲に、先端側から後端側に向かうにしたがって曲げ剛性が増大する中部領域と、前記中部領域の先端側にあって先端側に向かうにしたがって曲げ剛性が増大する前部領域と、前記中部領域の後端側にあって後端側に向かうにしたがって曲げ剛性が増大する後部領域とを有する。前記中部領域の全長に対する長さは全ての番手で略一致し、前記中部領域の先端側から後端側に亘る曲げ剛性分布は、全ての番手で略一致し、前記後部領域は、番手が大きくなるにしたがって前記前部領域よりも曲げ剛性が増大する率を大きくしている。
また、前記シャフトのうち、前記中部領域を前記シャフトのうちで最も曲げ剛性が低い領域としたことが好ましい。 In order to solve the above problems, according to the present invention, there is a shaft set for a golf club having a shaft for each count, and each shaft has a range of 25 to 60% of the total length from the tip side. A middle region where the bending rigidity increases from the front end side toward the rear end side, a front region which is at the front end side of the middle region and increases toward the front end side, and a rear end of the middle region And a rear region whose bending rigidity increases toward the rear end side. The length with respect to the total length of the middle region is substantially the same for all counts, the bending stiffness distribution from the front end side to the rear end side of the middle region is substantially the same for all counts, and the rear region has a larger count. Accordingly, the rate at which the bending rigidity increases is larger than that in the front region.
Moreover, it is preferable that the said center area | region is made into the area | region where bending rigidity is the lowest among the said shafts among the said shafts.

本発明によれば、前部領域の曲げ剛性をシャフトの先端側に向かうにしたがって増大させることによって、ヘッド１４の撓りに対する耐性を増すことができる。また、高番手ほど曲げ剛性が高く、低番手ほど曲げ剛性が低いので、高番手ほどスイング時のシャフトを硬くし、低番手ほどスイング時のシャフトを柔らかくできるが、中部領域の全長に対する長さ（軸方向長さ）を全てのシャフトで一致させ、かつ、中部領域の曲げ剛性分布を全てのシャフトで略一致させることによって、中部領域は各シャフトで略同一の撓り感を得ることができる。そして、後部領域では、中部領域から離れるほど曲げ剛性を増大させ、高番手ほど曲げ剛性値の差が大きく、低番手ほど曲げ剛性値の差を小さくしているので、ゴルフクラブをスイングしたときに、曲げ剛性が高いゴルフクラブのグリップ側（後端側）でのコントロールを確実に行える。そして、相対的に高番手ほどスイング時の柔らかさを感じ易く、低番手ほどスイング時の柔らかさを感じ難くすることができるので、同一のタイミングでスイングし易いゴルフクラブセット（シャフトセット）を提供できる。
また、シャフトのうち、中部領域を前記シャフトのうちで最も曲げ剛性が低い領域としたことによって、より確実に前部領域と中部領域との間、中部領域と後部領域との間の曲げ剛性の差を認識し易くすることができる。 According to the present invention, the resistance against bending of the head 14 can be increased by increasing the bending rigidity of the front region toward the tip end side of the shaft. Also, the higher the count, the higher the flexural rigidity, and the lower the count, the lower the flexural rigidity. The higher the count, the harder the shaft during swing, and the lower the count, the softer the shaft during swing. (Axial length) is made to be the same for all shafts, and the bending rigidity distribution of the middle region is made to be substantially the same for all the shafts, so that the middle region can have substantially the same bending feeling on each shaft. And in the rear area, the bending rigidity increases as the distance from the middle area increases, the difference in bending rigidity value increases as the higher number, and the difference in bending rigidity value decreases as the lower number, so when swinging the golf club In addition, the golf club having high bending rigidity can be reliably controlled on the grip side (rear end side). And, it is easier to feel the softness during the swing as the higher count, and the softness during the swing can be made harder to feel the lower the count, providing a golf club set (shaft set) that is easy to swing at the same timing it can.
Further, by making the middle region of the shaft the region having the lowest bending rigidity of the shaft, the bending stiffness between the front region and the middle region and between the middle region and the rear region can be more reliably determined. The difference can be easily recognized.

第１から第３実施形態に係るゴルフクラブを示す概略図。Schematic which shows the golf club which concerns on 1st to 3rd embodiment. 第１から第３実施形態に係るゴルフクラブ用シャフトを示す概略図。Schematic which shows the shaft for golf clubs concerning 1st to 3rd embodiment. 第１実施形態に係るゴルフクラブ用シャフトを製造する際に用いる芯金、芯金に対するプリプレグシートの形状、強化繊維の繊維方向、巻回順を示す概略図。BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the core metal used when manufacturing the golf club shaft which concerns on 1st Embodiment, the shape of the prepreg sheet with respect to a metal core, the fiber direction of a reinforced fiber, and winding order. 第１実施形態に係るゴルフクラブ用シャフトを製造する際に芯金に対してプリプレグシートを巻回した状態の概略的な断面図。1 is a schematic cross-sectional view of a state in which a prepreg sheet is wound around a core metal when manufacturing a golf club shaft according to a first embodiment. 第１実施形態に係るゴルフクラブ用シャフトの各番手ごとの先端からの長さに対する曲げ剛性を示すグラフ。The graph which shows the bending rigidity with respect to the length from the front-end | tip for every count of the shaft for golf clubs concerning 1st Embodiment. 第２実施形態に係るゴルフクラブ用シャフトを製造する際に用いる芯金、芯金に対するプリプレグシートの形状、強化繊維の繊維方向、巻回順を示す概略図。Schematic which shows the core metal used when manufacturing the golf club shaft which concerns on 2nd Embodiment, the shape of the prepreg sheet with respect to a metal core, the fiber direction of a reinforced fiber, and winding order. 第３実施形態に係るゴルフクラブ用シャフトを製造する際に用いる芯金、芯金に対するプリプレグシートの形状、強化繊維の繊維方向、巻回順を示す概略図。Schematic which shows the core metal used when manufacturing the shaft for golf clubs concerning 3rd Embodiment, the shape of the prepreg sheet with respect to a metal core, the fiber direction of a reinforced fiber, and winding order.

以下、図面を参照しながらこの発明を実施するための形態について説明する。
第１実施形態について図１から図５を用いて説明する。
ゴルフクラブセットのうち、アイアンセットは、一般には、例えば３番アイアンから９番アイアン、ピッチングウェッジ、アプローチウェッジ、サンドウェッジ等がセットとなっている。なお、アイアンセットには、１番アイアン、２番アイアン、その他のウェッジを含んでも良い。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
A first embodiment will be described with reference to FIGS.
Of the golf club sets, the iron set generally includes, for example, a 3 iron to a 9 iron, a pitching wedge, an approach wedge, a sand wedge, and the like. The iron set may include a first iron, a second iron, and other wedges.

以下、主に３番アイアンから９番アイアンのセットの例について説明するが、セットと称する場合、１番アイアン、２番アイアン、ピッチングウェッジ、アプローチウェッジ、サンドウェッジ等を適宜に含むことはもちろんである。また、ピッチングウェッジ、アプローチウェッジ、サンドウェッジ等を含めて、シャフトの長さが長くロフト角α（図１参照）が小さいほど番手が小さく、シャフトの長さが短くロフト角αが大きいほど番手が大きい、としてゴルフクラブ１０及びシャフト１２を規定する。また、「隣接する番手」には、番手間（例えば３番と４番、４番と５番等、ｎ番と（ｎ＋１）番）だけでなく、例えば３番及び４番のひとくくりと、５番及び６番のひとくくりとの間のように複数の番手が同じシャフトの構造である場合を含む。   Hereinafter, an example of a set of No. 3 iron to No. 9 iron will be mainly described. However, in the case of calling a set, it should be understood that the No. 1 iron, No. 2 iron, pitching wedge, approach wedge, sand wedge, etc. are appropriately included. is there. In addition, including pitching wedges, approach wedges, sand wedges, etc., the longer the shaft length, the smaller the loft angle α (see FIG. 1), the smaller the count, and the shorter the shaft length, the larger the loft angle α, the higher the count. The golf club 10 and the shaft 12 are defined as being large. In addition, in the “adjacent count”, not only between counts (eg, No. 3 and No. 4, No. 4 and No. 5, such as No. n and (n + 1)), for example, a group of No. 3 and No. 4, for example, This includes the case where a plurality of counts have the same shaft structure, such as between the No. 5 and No. 6 groups.

図１に示すように、アイアンセットの各ゴルフクラブ１０は、各番手とも同様に、繊維強化プリプレグシートの積層体からなる中空のシャフト（繊維強化複合材料製の管状体）１２と、このシャフト１２の先端（一端, TIP側）１２ａ（図２参照）の細径部分に取り付けられたヘッド１４と、シャフト１２の後端（他端, BUTT側）１２ｂ（図２参照）の太径部分に取り付けられたグリップ１６とを有する。なお、図１に示すシャフト１２の先端１２ａはヘッド１４のホーゼル１４ａ内に挿入された状態で固定されている。本実施形態ではゴルフクラブセットがアイアンセットとして形成されるので、例えばヘッド１４やグリップ１６は各番手で同様の装飾等がなされていることが好ましい。もちろん、シャフト１２に各番手で同様の装飾等がなされていることも好ましい。   As shown in FIG. 1, each golf club 10 of an iron set has a hollow shaft (tubular body made of a fiber reinforced composite material) 12 made of a laminated body of fiber reinforced prepreg sheets, and the shaft 12 in the same manner as each count. The head 14 attached to the small diameter part of the tip (one end, TIP side) 12a (see FIG. 2) and the large diameter part of the rear end (the other end, BUTT side) 12b (see FIG. 2) of the shaft 12 Grip 16. The tip 12a of the shaft 12 shown in FIG. 1 is fixed in a state of being inserted into the hosel 14a of the head 14. In this embodiment, since the golf club set is formed as an iron set, for example, the head 14 and the grip 16 are preferably provided with the same decoration and the like at each count. Of course, it is also preferable that the shaft 12 has the same decoration or the like at each count.

図１に示すシャフト１２とヘッド１４のフェース１４ｂとのロフト角αは、一般に、番手が上がるにつれて、２０°から６０°の間で４°ずつ大きくなる。また、シャフト１２の全長は、例えば３番アイアンのシャフト１２の長さＬは３９インチ（略９９ｃｍ）から、番手が上がるにつれて、０．５インチ（略１．２７ｃｍ）ずつ短くなる。シャフト１２の先端１２ａの外径は後述するように同じ厚さのプリプレグシートを用いるので番手によらず一定で例えば約９．００ｍｍから１０．００ｍｍ程度であり、後端１２ｂの外径は後述するように厚さが異なるプリプレグシートを用いるので番手ごとに異なるが例えば約１４．２０ｍｍから１６．５０ｍｍ程度である。シャフト１２の外周面は中心軸Ｃに対して約８／１０００から１０／１０００程度の傾き（テーパ角度）を有するようにテーパ状に形成されていることが好ましい。シャフト１２がテーパ状であることにより、シャフト１２の先端径に対するグリップ径の関係でゴルファーがグリップを握り易く、グリップ力を発揮し易い外径にできる。   The loft angle α between the shaft 12 and the face 14b of the head 14 shown in FIG. 1 generally increases by 4 ° between 20 ° and 60 ° as the count increases. Further, the overall length of the shaft 12 is reduced from 0.5 inches (approximately 1.27 cm) as the count increases from, for example, the length L of the shaft 12 of the third iron from 39 inches (approximately 99 cm). As will be described later, the outer diameter of the tip 12a of the shaft 12 is constant regardless of the count because it uses a prepreg sheet having the same thickness, for example, about 9.00 mm to 10.00 mm, and the outer diameter of the rear end 12b will be described later. Since prepreg sheets having different thicknesses are used as described above, for example, the thickness is about 14.20 mm to about 16.50 mm. The outer peripheral surface of the shaft 12 is preferably formed in a tapered shape so as to have an inclination (taper angle) of about 8/1000 to 10/1000 with respect to the central axis C. When the shaft 12 is tapered, the golfer can easily grip the grip due to the grip diameter with respect to the tip diameter of the shaft 12, and the outer diameter can easily exert the grip force.

図３に示す、本実施形態に係る各ゴルフクラブ１０用のシャフト１２を作製するための芯金（マンドレル）２０は、アイアンセットに共通して１つの形状のものが用いられる。芯金２０は、その先端２０ａから後端２０ｂに向かって順に、第１テーパ部２２と、第２テーパ部２４と、第３テーパ部２６と、第４テーパ部２８と、第５テーパ部３０と、ストレート部３２とを有し、先端２０ａ側が後端２０ｂ側に比べて細く形成されている。第１テーパ部２２と第２テーパ部２４との間、第２テーパ部２４と第３テーパ部２６との間、第３テーパ部２６と第４テーパ部２８との間、第４テーパ部２８と第５テーパ部３０との間、第５テーパ部３０とストレート部３２との間には、それぞれ芯金２０の外周面の傾きを変化させるための境目となる円周状の変位部２３，２５，２７，２９，３１が形成されている。
そして、芯金２０は、主に、その先端２０ａ側の前方領域ＦＭと、その後端２０ｂ側の後方領域（グリップ側領域）ＢＭと、前方領域ＦＭ及び後方領域ＢＭの間の中間領域ＭＭとの３つに分けることができる。 A cored bar (mandrel) 20 for producing the shaft 12 for each golf club 10 according to the present embodiment shown in FIG. 3 has a common shape for the iron set. The metal core 20 has a first taper portion 22, a second taper portion 24, a third taper portion 26, a fourth taper portion 28, and a fifth taper portion 30 in order from the front end 20a to the rear end 20b. And the straight portion 32, the tip 20a side is formed thinner than the rear end 20b side. Between the 1st taper part 22 and the 2nd taper part 24, between the 2nd taper part 24 and the 3rd taper part 26, between the 3rd taper part 26 and the 4th taper part 28, and the 4th taper part 28 Between the first taper portion 30 and the fifth taper portion 30, and between the fifth taper portion 30 and the straight portion 32, a circumferential displacement portion 23 serving as a boundary for changing the inclination of the outer peripheral surface of the cored bar 20, respectively. 25, 27, 29, and 31 are formed.
The cored bar 20 mainly includes a front region FM on the front end 20a side, a rear region (grip side region) BM on the rear end 20b side, and an intermediate region MM between the front region FM and the rear region BM. It can be divided into three.

なお、第２テーパ部２４は第１テーパ部２２（例えば傾き８／１０００から９／１０００程度）に対して略４倍傾きが大きい。第４テーパ部２８は、第５テーパ部３０に対して長さが短く緩い（傾きが小さい）テーパである。言い換えると、第５テーパ部３０は、第４テーパ部２８に対して、長く急な（傾きが大きい）テーパである。
また、第３テーパ部２６と第５テーパ部３０とは略同一の傾きであることが好ましい。第５テーパ部３０にある一定肉厚のプリプレグシートを載せたときに、そのプリプレグシートの外周面と第３テーパ部２６の外周面とが面一になるからである。そして、これら第３テーパ部２６及び第５テーパ部３０の傾きは、シャフト１２の外周面の上述した傾きと略同一である。 Note that the second taper portion 24 has a substantially four times larger inclination than the first taper portion 22 (for example, an inclination of about 8/1000 to 9/1000). The fourth taper portion 28 is a taper that is short and loose (the inclination is small) with respect to the fifth taper portion 30. In other words, the fifth taper portion 30 is a long and steep taper (a large inclination) with respect to the fourth taper portion 28.
Moreover, it is preferable that the 3rd taper part 26 and the 5th taper part 30 are substantially the same inclination. This is because when the prepreg sheet having a certain thickness is placed on the fifth taper portion 30, the outer peripheral surface of the prepreg sheet and the outer peripheral surface of the third taper portion 26 are flush with each other. The inclinations of the third taper portion 26 and the fifth taper portion 30 are substantially the same as the inclination of the outer peripheral surface of the shaft 12 described above.

図２に示すように、本実施形態に係るシャフト１２は、主に、その先端１２ａ側でヘッド１４が取り付けられる前部領域（ヘッド側領域）ＦＳと、その後端１２ｂ側でグリップ１６が取り付けられる後部領域（グリップ側領域）ＢＳと、前部領域ＦＳ及び後部領域ＢＳの間の中部領域ＭＳとの３つに分けることができる。
前部領域ＦＳは、シャフト１２の先端１２ａを０としたときに、先端１２ａから２００ｍｍ〜２５０ｍｍ程度の範囲にあり、シャフト１２の全長の略２５％程度であることが好ましい。中部領域ＭＳは、シャフト１２の先端１２ａから２００ｍｍ〜２５０ｍｍ程度の範囲から３５０ｍｍ〜４００ｍｍ程度の範囲にあり、シャフト１２の全長の略２５％程度であることが好ましい。後部領域ＢＳは、シャフト１２の先端１２ａから３５０ｍｍ〜４００ｍｍ程度の範囲から１０００ｍｍ〜１１００ｍｍ程度の範囲にあり、シャフト１２の全長の略５０％程度であることが好ましい。すなわち、シャフト１２の先端１２ａを０％、後端１２ｂを１００％としたときに、前部領域ＦＳが０％から略２５％の位置に、中部領域ＭＳが略２５％から略５０％の位置に、後部領域ＢＳが略５０％から１００％の位置にある。 As shown in FIG. 2, the shaft 12 according to the present embodiment mainly has a front region (head side region) FS to which the head 14 is attached on the front end 12 a side and a grip 16 on the rear end 12 b side. It can be divided into a rear region (grip side region) BS and a middle region MS between the front region FS and the rear region BS.
The front region FS is in a range of about 200 mm to 250 mm from the tip 12 a when the tip 12 a of the shaft 12 is 0, and is preferably about 25% of the total length of the shaft 12. The middle region MS is in a range from about 200 mm to 250 mm to about 350 mm to 400 mm from the tip 12 a of the shaft 12, and is preferably about 25% of the total length of the shaft 12. The rear region BS is in the range of about 350 mm to 400 mm from the tip 12 a of the shaft 12 to about 1000 mm to 1100 mm, and is preferably about 50% of the total length of the shaft 12. That is, when the front end 12a of the shaft 12 is 0% and the rear end 12b is 100%, the front region FS is in a position from 0% to about 25%, and the middle region MS is in a position from about 25% to about 50%. In addition, the rear region BS is at a position of approximately 50% to 100%.

シャフト１２は、それぞれ強化繊維に合成樹脂が含浸した繊維強化プリプレグシートである、第１から第３の前部補強プリプレグシート４２，４４，４６と、第１から第３の後部補強プリプレグシート５２，５４，５６と、第１から第３の本体プリプレグシート６２，６４，６６と、第４の前部補強プリプレグシート４８とを芯金２０に巻回することにより形成される。   The shaft 12 is a fiber-reinforced prepreg sheet in which reinforcing fibers are impregnated with a synthetic resin, and the first to third front reinforcing prepreg sheets 42, 44, 46, and the first to third rear reinforcing prepreg sheets 52, 54, 56, first to third main body prepreg sheets 62, 64, 66 and a fourth front reinforcing prepreg sheet 48 are wound around the cored bar 20.

各プリプレグシートの強化繊維には、主に炭素繊維が用いられるが、金属繊維、ガラス繊維、アラミド繊維等、種々の繊維を用いても良い。強化繊維に含浸させるマトリクス樹脂（合成樹脂）としては、熱硬化性樹脂及び熱可塑性樹脂のいずれを用いても良い。熱硬化性樹脂であれば、例えばエポキシ、ピスマレイミド、ポリイミド、フェノール等が用いられる。熱可塑性樹脂であれば、ポリエーテルエーテルケトン（ＰＥＥＫ）、ポリエーテルサルホン（ＰＥＳ）、ポリエーテルイミド（ＰＥＩ）、ポリフェニレンサルファイド（ＰＰＳ）、ポリアミド（ＰＡ）、ポリプロピレン（ＰＰ）等が用いられる。   Carbon fibers are mainly used for the reinforcing fibers of each prepreg sheet, but various fibers such as metal fibers, glass fibers, and aramid fibers may be used. As the matrix resin (synthetic resin) to be impregnated into the reinforcing fiber, either a thermosetting resin or a thermoplastic resin may be used. If it is a thermosetting resin, for example, epoxy, pismaleimide, polyimide, phenol and the like are used. If it is a thermoplastic resin, polyether ether ketone (PEEK), polyether sulfone (PES), polyether imide (PEI), polyphenylene sulfide (PPS), polyamide (PA), polypropylene (PP), etc. are used.

そして、以下の表１には、シャフト１２を構成する各プリプレグシートの芯金２０に対する強化繊維の繊維方向を示す。

Figure 2012090730
Table 1 below shows the fiber direction of the reinforcing fiber with respect to the core 20 of each prepreg sheet constituting the shaft 12.
Figure 2012090730

表１に示すように、例えば第１から第３前部補強シート４２，４４，４６及び第１から第３の後部補強シート５２，５４，５６は、それぞれ芯金２０の軸長方向に繊維方向を配している。すなわち、第１から第３前部補強シート４２，４４，４６及び第１から第３の後部補強シート５２，５４，５６はそれぞれ芯金２０の軸長方向に繊維方向を配する軸長方向繊維層を形成し、補強や曲げ剛性の調整に用いられる。第４前部補強シート４８も第１から第３の前部補強シート４２，４４，４６と同様に、芯金２０の軸長方向に繊維方向を配する軸長方向繊維層を形成し、外径の調整、補強及び曲げ剛性の調整に用いられる。   As shown in Table 1, for example, the first to third front reinforcing sheets 42, 44, 46 and the first to third rear reinforcing sheets 52, 54, 56 are each in the fiber direction in the axial direction of the cored bar 20. Is arranged. That is, the first to third front reinforcing sheets 42, 44, 46 and the first to third rear reinforcing sheets 52, 54, 56 are axial length fibers in which the fiber direction is arranged in the axial length direction of the cored bar 20. Layers are used to reinforce and adjust bending stiffness. Similarly to the first to third front reinforcing sheets 42, 44 and 46, the fourth front reinforcing sheet 48 also forms an axial length direction fiber layer in which the fiber direction is arranged in the axial length direction of the core metal 20, and Used for adjustment of diameter, reinforcement and bending rigidity.

第１及び第２本体シート６２，６４は芯金２０の軸長方向に対して傾斜した傾斜方向繊維層を形成し、捩れ剛性の調整用に用いられる。第１本体シート６２は強化繊維が軸長方向に対して例えば＋（プラス）３０度から５０度程度（特に好ましくは＋４５度）傾斜し、第２本体シート６４は強化繊維が軸長方向に対して例えば−（マイナス）３０度から５０度程度（特に好ましくは−４５度）傾斜している。第３本体シート６６は芯金２０の軸長方向に繊維方向を配する軸長方向繊維層を形成し、曲げ剛性の調整に用いられる。
なお、第１及び第２本体シート６２，６４は樹脂量（繊維含有率）が２０〜４０ｗｔ％、引張弾性率が１０〜４００ＧＰａのものが用いられる。第３本体シート６６は樹脂量（繊維含有率）が２０〜４０ｗｔ％、引張弾性率が１０〜４００ＧＰａのものが用いられる。ただし、本実施形態では、第１から第３本体シート６２，６４，６６は、番手によらず３番アイアンから９番アイアンまで同一のものを用いる。 The first and second main body sheets 62 and 64 form an inclined fiber layer that is inclined with respect to the axial length direction of the cored bar 20 and is used for adjusting torsional rigidity. In the first main body sheet 62, the reinforcing fibers are inclined with respect to the axial direction, for example, + (plus) 30 degrees to 50 degrees (particularly preferably +45 degrees), and the second main body sheet 64 has the reinforcing fibers with respect to the axial direction. For example, the inclination is − (minus) 30 to 50 degrees (particularly preferably −45 degrees). The 3rd main body sheet | seat 66 forms the axial length direction fiber layer which distributes a fiber direction to the axial length direction of the metal core 20, and is used for adjustment of bending rigidity.
The first and second main body sheets 62 and 64 have a resin amount (fiber content) of 20 to 40 wt% and a tensile elastic modulus of 10 to 400 GPa. As the third main body sheet 66, one having a resin amount (fiber content) of 20 to 40 wt% and a tensile elastic modulus of 10 to 400 GPa is used. However, in the present embodiment, the first to third main body sheets 62, 64, 66 are the same from the 3rd iron to the 9th iron regardless of the count.

したがって、シャフト１２の前部領域ＦＳは、第１から第３の前部補強プリプレグシート４２，４４，４６と、第１から第３の本体プリプレグシート６２，６４，６６と、第４の前部補強プリプレグシート４８とにより芯金２０の前方領域ＦＭに対応して形成される。シャフト１２の後部領域ＢＳは、第１から第３の後部補強プリプレグシート５２，５４，５６と、第１から第３の本体プリプレグシート６２，６４，６６とにより芯金２０の後方領域ＢＭに対応して形成される。シャフト１２の中部領域ＭＳは、第１から第３の本体プリプレグシート６２，６４，６６により芯金２０の中間領域ＭＭに対応して形成される。
芯金２０の前方領域ＦＭにプリプレグを巻回して前部領域ＦＳを形成し、芯金２０の後方領域ＢＭにプリプレグを巻回して後部領域ＢＳを形成し、芯金２０の中間領域ＭＭに沿うとともに前部領域ＦＳ及び後部領域ＢＳの外周にプリプレグを巻回して前部領域ＦＳと後部領域ＢＳとの間に中部領域ＭＳを形成することによってシャフト１２を作製できる。このため、シャフト１２の曲げ剛性の調整をするに当たり、積層構造を簡易にして製造精度のバラツキを少なくすることが可能となる。 Accordingly, the front region FS of the shaft 12 includes first to third front reinforcing prepreg sheets 42, 44, 46, first to third main body prepreg sheets 62, 64, 66, and a fourth front portion. The reinforcing prepreg sheet 48 is formed corresponding to the front region FM of the cored bar 20. The rear region BS of the shaft 12 corresponds to the rear region BM of the cored bar 20 by the first to third rear reinforcing prepreg sheets 52, 54, 56 and the first to third main body prepreg sheets 62, 64, 66. Formed. The middle region MS of the shaft 12 is formed by the first to third main body prepreg sheets 62, 64, 66 corresponding to the intermediate region MM of the cored bar 20.
A prepreg is wound around the front region FM of the core metal 20 to form the front region FS, and a prepreg is wound around the rear region BM of the core metal 20 to form the rear region BS, along the intermediate region MM of the core metal 20. At the same time, the shaft 12 can be produced by winding the prepreg around the outer periphery of the front region FS and the rear region BS to form the middle region MS between the front region FS and the rear region BS. For this reason, when adjusting the bending rigidity of the shaft 12, it is possible to simplify the laminated structure and reduce variations in manufacturing accuracy.

各番手のシャフト１２の前部領域ＦＳに用いられる第１から第３前部補強シート４２，４４，４６は、表２のＦ１からＦ３の組成のプリプレグシートが適宜に用いられる。表２のＦ１からＦ３のプリプレグシートは、目付量及びシート厚さが同一（又は略同一であっても良い）で、繊維弾性率が異なっている。繊維弾性率はＦ１よりもＦ２の方が例えば５０ＧＰａ大きく、Ｆ２よりもＦ３の方が例えば１１０ＧＰａ大きい。ただし、繊維弾性率の差は適宜に設定できる。すなわち、Ｆ１とＦ２の繊維弾性率の差は例えば６０ＧＰａ等、５０ＧＰａよりも大きくても良いし、４０ＧＰａ等、小さくても良い。Ｆ２とＦ３の繊維弾性率の差も同様である。

Figure 2012090730
As the first to third front reinforcing sheets 42, 44, and 46 used in the front region FS of each count shaft 12, prepreg sheets having compositions F1 to F3 in Table 2 are appropriately used. The prepreg sheets F1 to F3 in Table 2 have the same basis weight and sheet thickness (or may be substantially the same), and have different fiber elastic moduli. The fiber elastic modulus of F2 is, for example, 50 GPa greater than F1, and F3 is, for example, 110 GPa greater than F2. However, the difference in fiber elastic modulus can be set as appropriate. That is, the difference in fiber elastic modulus between F1 and F2 may be greater than 50 GPa, such as 60 GPa, or may be as small as 40 GPa. The difference in the fiber elastic modulus between F2 and F3 is the same.
Figure 2012090730

各番手のシャフト１２の後部領域ＢＳに用いられる第１から第３後部補強シート５２，５４，５６は、表３のＢ１からＢ５の組成のプリプレグシートが適宜に用いられる。表３のＢ１からＢ４のプリプレグシートは繊維弾性率が同一（又は略同一であっても良い）で、目付量、シート厚さが異なっている。なお、Ｂ５の強化繊維の繊維弾性率はＢ１からＢ４の強化繊維の繊維弾性率よりも大きい。また、目付量及びシート厚さは、それぞれＢ１よりもＢ２、Ｂ２よりもＢ３、Ｂ３よりもＢ４、Ｂ４よりもＢ５が大きい。

Figure 2012090730
As the first to third rear reinforcing sheets 52, 54 and 56 used in the rear region BS of each count shaft 12, prepreg sheets having the compositions B1 to B5 in Table 3 are appropriately used. The prepreg sheets B1 to B4 in Table 3 have the same fiber elastic modulus (or may be substantially the same), and differ in basis weight and sheet thickness. In addition, the fiber elastic modulus of the reinforcing fiber of B5 is larger than the fiber elastic modulus of the reinforcing fiber of B1 to B4. Further, the basis weight and the sheet thickness are B2 larger than B1, B3 larger than B2, B4 larger than B3, and B5 larger than B4, respectively.
Figure 2012090730

なお、第１から第３の前部補強シート４２，４４，４６、第１から第３の後部補強シート５２，５４，５６、第１から第３の本体シート６２，６４，６６、第４の前部補強シート４８はそれぞれ一定肉厚のものが用いられる。   The first to third front reinforcing sheets 42, 44, 46, the first to third rear reinforcing sheets 52, 54, 56, the first to third main body sheets 62, 64, 66, the fourth Each of the front reinforcing sheets 48 has a constant thickness.

そして、図３に示すように、第１前部補強シート４２は芯金２０の第１テーパ部２２と、第２テーパ部２４の前側部分に巻回される。第２及び第３前部補強シート４４，４６は、第１前部補強シート４２の先端に第２及び第３前部補強シート４４，４６の先端を合わせた状態で第１前部補強シート４２の外周に巻回される。このとき、第２及び第３前部補強シート４４，４６は芯金２０の第１テーパ部２２と、第２テーパ部２４との外周に巻回されることとなる。このため、図４に示すように、芯金２０の先端（一端）２０ａ側には第１前部補強層７２が形成される。   As shown in FIG. 3, the first front reinforcing sheet 42 is wound around the first tapered portion 22 of the core metal 20 and the front portion of the second tapered portion 24. The second and third front reinforcing sheets 44 and 46 are arranged in such a manner that the tips of the second and third front reinforcing sheets 44 and 46 are aligned with the tips of the first front reinforcing sheet 42. It is wound around the outer periphery of. At this time, the second and third front reinforcing sheets 44 and 46 are wound around the outer periphery of the first tapered portion 22 and the second tapered portion 24 of the cored bar 20. Therefore, as shown in FIG. 4, the first front reinforcing layer 72 is formed on the tip (one end) 20 a side of the cored bar 20.

このとき、第１前部補強層７２の外周面は芯金２０の第３テーパ部２６の外周面と略面一である。
図３に示す第１から第３前部補強シート４２，４４，４６はそれぞれ略三角形状部分４２ａ，４４ａ，４６ａを有する。図４に示すように、これら略三角形状部分４２ａ，４４ａ，４６ａは芯金２０の第２テーパ部２４に巻回され、第３テーパ部２６の外周面と第１の前部補強層７２の外周面とを略面一にする外径調整層（前部側外径調整領域）７２ａを形成している。なお、外径調整層７２ａはその軸長方向長さ（軸長方向幅）がシャフト１２の全長Ｌに対して例えば４％から６％程度で小さい。このため、略三角形状部分４２ａ，４４ａ，４６ａによってシャフト１２の周方向に生じる異方性の存在を抑制できる。 At this time, the outer peripheral surface of the first front reinforcing layer 72 is substantially flush with the outer peripheral surface of the third tapered portion 26 of the cored bar 20.
The first to third front reinforcing sheets 42, 44, 46 shown in FIG. 3 have substantially triangular portions 42a, 44a, 46a, respectively. As shown in FIG. 4, these substantially triangular portions 42 a, 44 a, 46 a are wound around the second taper portion 24 of the core metal 20, and the outer peripheral surface of the third taper portion 26 and the first front reinforcing layer 72. An outer diameter adjusting layer (front side outer diameter adjusting region) 72a is formed so as to be substantially flush with the outer peripheral surface. The outer diameter adjusting layer 72a has a length in the axial length direction (width in the axial length direction) that is smaller than the total length L of the shaft 12, for example, about 4% to 6%. For this reason, the presence of anisotropy generated in the circumferential direction of the shaft 12 by the substantially triangular portions 42a, 44a, 46a can be suppressed.

この外径調整層７２ａは第１及び第２テーパ部２２，２４間の変位部２３の外側位置のシャフト１２の内周面と、第２及び第３テーパ部２４，２６間の変位部２５の外側位置のシャフト１２の内周面とを滑らかに連続させる。このとき、芯金２０の第３テーパ部２６の外周面とシャフト１２の第１の前部補強層７２の外周面とを略面一に形成するので、第１及び第２テーパ部２２，２４間の変位部２３の外側位置のシャフト１２の第１前部補強層７２の肉厚を後端側に向かうにつれて徐々に減肉させて、第２及び第３テーパ部２４，２６間の変位部２５の外側位置でのシャフト１２の第１前部補強層７２の肉厚を略０としている。なお、ここでの減肉は、第１から第３前部補強シート４２，４４，４６自体を減肉させるものではなく、各シート４２，４４，４６の略三角形状部分４２ａ，４４ａ，４６ａを芯金２０の第２テーパ部２４に巻回することにより次第に減肉させた状態と同様の状態にしていくものである。
したがって、外径調整層７２ａにより、シャフト１２の内周面に急激な段差が生じるのを防止しシャフト１２の内径変化を少なくできるとともに、シャフト１２の軸方向に沿った方向の急激な強度変化を防止できる。すなわち、外径調整層７２ａは、シャフト１２のうち、第１テーパ部２２の外周位置に対応する部位と第３テーパ部２６の外周位置に対応する部位との間の剛性差を、急激な段差を有する場合（外径調整層７２ａが存在しない場合）よりも緩やかに変化させることができる。 The outer diameter adjusting layer 72a is formed between the inner peripheral surface of the shaft 12 at the outer side of the displacement portion 23 between the first and second taper portions 22 and 24 and the displacement portion 25 between the second and third taper portions 24 and 26. The inner peripheral surface of the shaft 12 at the outer position is continuously made smooth. At this time, the outer peripheral surface of the third taper portion 26 of the cored bar 20 and the outer peripheral surface of the first front reinforcing layer 72 of the shaft 12 are formed substantially flush with each other, so the first and second tapered portions 22 and 24 are formed. The thickness of the first front reinforcing layer 72 of the shaft 12 at the outer position of the intermediate displacement portion 23 is gradually reduced toward the rear end side, so that the displacement portion between the second and third taper portions 24, 26 is obtained. The thickness of the first front reinforcing layer 72 of the shaft 12 at the outer position of 25 is substantially zero. The thinning here does not reduce the thickness of the first to third front reinforcing sheets 42, 44, 46 themselves, but the substantially triangular portions 42 a, 44 a, 46 a of the respective sheets 42, 44, 46. By winding the wire around the second taper portion 24 of the cored bar 20, the same state as that gradually reduced is achieved.
Therefore, the outer diameter adjusting layer 72a can prevent a sudden step on the inner peripheral surface of the shaft 12 to reduce the change in the inner diameter of the shaft 12, and can also cause a rapid intensity change in the direction along the axial direction of the shaft 12. Can be prevented. In other words, the outer diameter adjustment layer 72a has a steep difference in rigidity between the portion of the shaft 12 corresponding to the outer peripheral position of the first tapered portion 22 and the portion corresponding to the outer peripheral position of the third tapered portion 26. It can be changed more slowly than the case where the outer diameter adjusting layer 72a is not present.

図３に示すように、第１から第３の後部補強シート５２，５４，５６は、第４テーパ部２８及び第５テーパ部３０に巻回される。第１後部補強シート５２は芯金２０の第４テーパ部２８と、第５テーパ部３０とに巻回される。第２及び第３後部補強シート５４，５６は、第１後部補強シート５２の後端に第２及び第３後部補強シート５４，５６の後端を合わせた状態で第１後部補強シート５２の外周に巻回される。このとき、第２及び第３後部補強シート５４，５６は芯金２０の第４テーパ部２８と、第５テーパ部３０との外周に巻回されることとなる。このため、図４に示すように、第４テーパ部２８及び第５テーパ部３０の外周面には後部補強層７４が形成されている。
このとき、第１前部補強層７２及び後部補強層７４の外周面は芯金２０の第３テーパ部２６の外周面と略面一である。 As shown in FIG. 3, the first to third rear reinforcing sheets 52, 54, 56 are wound around the fourth tapered portion 28 and the fifth tapered portion 30. The first rear reinforcing sheet 52 is wound around the fourth taper portion 28 and the fifth taper portion 30 of the cored bar 20. The second and third rear reinforcing sheets 54 and 56 are arranged on the outer periphery of the first rear reinforcing sheet 52 with the rear ends of the second and third rear reinforcing sheets 54 and 56 aligned with the rear ends of the first rear reinforcing sheet 52. Wound around. At this time, the second and third rear reinforcing sheets 54 and 56 are wound around the outer periphery of the fourth tapered portion 28 and the fifth tapered portion 30 of the cored bar 20. Therefore, as shown in FIG. 4, a rear reinforcing layer 74 is formed on the outer peripheral surfaces of the fourth tapered portion 28 and the fifth tapered portion 30.
At this time, the outer peripheral surfaces of the first front reinforcing layer 72 and the rear reinforcing layer 74 are substantially flush with the outer peripheral surface of the third tapered portion 26 of the core metal 20.

そして、図３に示す第１から第３後部補強シート５２，５４，５６はそれぞれ略三角形状部分５２ａ，５４ａ，５６ａを有する。図４に示すように、これら略三角形状部分５２ａ，５４ａ，５６ａは第４テーパ部２８に巻回され、芯金２０の第３テーパ部２６の外周面と、第４テーパ部２８及び第５テーパ部３０に巻回されたシャフト１２の後部補強層７４の外周面とを面一にする外径調整層（後部側外径調整領域）７４ａを形成している。なお、外径調整層７４ａはその軸長方向長さ（軸長方向幅）がシャフト１２の全長Ｌに対して例えば４％から６％程度で小さい。このため、略三角形状部分５２ａ，５４ａ，５６ａによってシャフト１２の周方向に生じる異方性の存在を抑制できる。   The first to third rear reinforcing sheets 52, 54, and 56 shown in FIG. 3 have substantially triangular portions 52a, 54a, and 56a, respectively. As shown in FIG. 4, these substantially triangular portions 52a, 54a, and 56a are wound around the fourth taper portion 28, and the outer peripheral surface of the third taper portion 26 of the cored bar 20, the fourth taper portion 28, and the fifth taper portion. An outer diameter adjusting layer (rear side outer diameter adjusting region) 74a is formed so as to be flush with the outer peripheral surface of the rear reinforcing layer 74 of the shaft 12 wound around the tapered portion 30. The outer diameter adjustment layer 74a has a length in the axial length direction (a width in the axial length direction) that is smaller than the total length L of the shaft 12, for example, about 4% to 6%. For this reason, the presence of anisotropy generated in the circumferential direction of the shaft 12 by the substantially triangular portions 52a, 54a, and 56a can be suppressed.

この外径調整層７４ａは第３及び第４テーパ部２６，２８間の変位部２７の外側位置のシャフト１２の内周面と、第４及び第５テーパ部２８，３０間の変位部２９の外側位置のシャフト１２の内周面とを滑らかに連続させる。このとき、芯金２０の第３テーパ部２６の外周面とシャフト１２の後部補強層７４の外周面とを略面一に形成するので、第４及び第５テーパ部２８，３０間の変位部２９の外側位置のシャフト１２の後部補強層７４の肉厚を先端側に向かうにつれて徐々に減肉させて、第３及び第４テーパ部２６，２８間の変位部２７の外側でのシャフト１２の後部補強層７４の肉厚を略０としている。なお、ここでの減肉は、第１から第３の後部補強シート５２，５４，５６自体を減肉させるものではなく、シート５２，５４，５６の略三角形状部分５２ａ，５４ａ，５６ａを芯金２０の第４テーパ部２８に巻回することにより次第に減肉させた状態と同様の状態にしていくものである。
したがって、外径調整層７４ａにより、シャフト１２の内周面に急激な段差が生じるのを防止できるとともに、シャフト１２の軸方向に沿った方向の急激な強度変化を防止できる。すなわち、外径調整層７４ａは、シャフト１２のうち、第３テーパ部２６の外周位置に対応する部位と第５テーパ部３０の外周位置に対応する部位との間の剛性差を急激な段差を有する場合（外径調整層７４ａが存在しない場合）よりも緩やかに変化させることができる。 The outer diameter adjusting layer 74a has an inner peripheral surface of the shaft 12 outside the displacement portion 27 between the third and fourth taper portions 26, 28 and a displacement portion 29 between the fourth and fifth taper portions 28, 30. The inner peripheral surface of the shaft 12 at the outer position is continuously made smooth. At this time, since the outer peripheral surface of the third taper portion 26 of the cored bar 20 and the outer peripheral surface of the rear reinforcing layer 74 of the shaft 12 are formed substantially flush with each other, the displacement portion between the fourth and fifth taper portions 28 and 30 is formed. 29, the thickness of the rear reinforcing layer 74 of the shaft 12 at the outer position of the shaft 12 is gradually reduced toward the distal end, and the shaft 12 outside the displacement portion 27 between the third and fourth taper portions 26, 28 is reduced. The thickness of the rear reinforcing layer 74 is substantially zero. Note that the thickness reduction here does not reduce the thickness of the first to third rear reinforcing sheets 52, 54, and 56 themselves, and the substantially triangular portions 52a, 54a, and 56a of the sheets 52, 54, and 56 are cored. By winding on the fourth taper portion 28 of the gold 20, the same state as that gradually reduced is achieved.
Therefore, the outer diameter adjusting layer 74a can prevent a steep step on the inner peripheral surface of the shaft 12, and can prevent a sudden strength change in the direction along the axial direction of the shaft 12. That is, the outer diameter adjustment layer 74a has a steep difference in rigidity between the portion of the shaft 12 corresponding to the outer peripheral position of the third tapered portion 26 and the portion corresponding to the outer peripheral position of the fifth tapered portion 30. It can be changed more slowly than when it has (when the outer diameter adjusting layer 74a is not present).

第１本体シート６２は、第１から第３の前部補強シート４２，４４，４６と、第１から第３の後部補強シート５２，５４，５６との外周に巻回される。このため、図３に示すように、第１本体シート６２が直接芯金２０に巻回されるのは、第３テーパ部２６だけである。
このとき、第１本体シート６２の強化繊維の繊維方向は芯金２０の中心軸Ｃ（軸長方向）に対して傾斜しているので、芯金２０の軸長方向に強化繊維の繊維方向を有するプリプレグ材を積層するよりも巻き付けが難しいため強化繊維を巻回する際に蛇行し易くなるが、第１本体シート６２を硬度のある芯金２０の第３テーパ部２６に直接巻回できるので、プリプレグシート（第１前部補強層７２及び後部補強層７４）上に第１本体シート６２を巻回するよりも強固に巻き付けることができ、第３テーパ部２６の外周での強化繊維の蛇行量を少なくすることができる。
このように、芯金２０の第３テーパ部２６の外周に直接、軸長方向に対して傾斜した方向に強化繊維を有するプリプレグシートを巻回するので、シャフト１２の強度を安定化することができる。なお、軸長方向に対して傾斜した方向として、軸長方向に対して直交する周方向に強化繊維を有するプリプレグシートを巻回する場合も同様である。 The first main body sheet 62 is wound around the outer periphery of the first to third front reinforcing sheets 42, 44, 46 and the first to third rear reinforcing sheets 52, 54, 56. For this reason, as shown in FIG. 3, the first main body sheet 62 is directly wound around the cored bar 20 only in the third tapered portion 26.
At this time, since the fiber direction of the reinforcing fibers of the first main body sheet 62 is inclined with respect to the central axis C (axial length direction) of the cored bar 20, the fiber direction of the reinforcing fibers is set in the axial direction of the cored bar 20. Since winding is more difficult than laminating the prepreg material, the first main body sheet 62 can be directly wound around the third taper portion 26 of the core metal 20 having hardness. The reinforcing fiber meanders on the outer periphery of the third taper portion 26 can be wound more firmly than the first main body sheet 62 on the prepreg sheet (the first front reinforcing layer 72 and the rear reinforcing layer 74). The amount can be reduced.
Thus, the strength of the shaft 12 can be stabilized because the prepreg sheet having reinforcing fibers is wound directly on the outer periphery of the third taper portion 26 of the core metal 20 in the direction inclined with respect to the axial length direction. it can. The same applies to a case where a prepreg sheet having reinforcing fibers is wound in a circumferential direction orthogonal to the axial length direction as a direction inclined with respect to the axial length direction.

なお、第３テーパ部２６の外周面と第１の前部補強層７２の外周面との間、第３テーパ部２６の外周面と後部補強層７４の外周面との間は略面一であるので、略同一のテーパ角度を有する。この外周に肉厚が一定の第１本体シート６２を巻回するので、第１本体シート６２の外周面もシャフト１２の外周面と略同一のテーパ角度を有する。このとき、第３テーパ部２６の外周面と第１の前部補強層７２の外周面との間、第３テーパ部２６の外周面と後部補強層７４の外周面との間に段差がないので、第１本体シート６２を巻回する際に容易に巻回（積層）できる。   The outer peripheral surface of the third tapered portion 26 and the outer peripheral surface of the first front reinforcing layer 72 and the outer peripheral surface of the third tapered portion 26 and the outer peripheral surface of the rear reinforcing layer 74 are substantially flush. Therefore, they have substantially the same taper angle. Since the first main body sheet 62 having a constant thickness is wound around the outer periphery, the outer peripheral surface of the first main body sheet 62 also has substantially the same taper angle as the outer peripheral surface of the shaft 12. At this time, there is no step between the outer peripheral surface of the third tapered portion 26 and the outer peripheral surface of the first front reinforcing layer 72 and between the outer peripheral surface of the third tapered portion 26 and the outer peripheral surface of the rear reinforcing layer 74. Therefore, when the 1st main body sheet | seat 62 is wound, it can be wound (laminated | stacked) easily.

そして、肉厚が一定の第２本体シート６４を第１本体シート６２の外周に巻回し、第１本体シート６２及び第２本体シート６４で第１本体層７６を形成する。このため、第１本体層７６の外周面はシャフト１２の外周面と略同一のテーパ角度を有する。
また、第１本体シート６２、第２本体シート６４は強化繊維の繊維方向が軸長方向に対して互いに反対方向に例えば略等角度ずつずらしているので、シャフト１２の捩り剛性を良好に発揮させることができる。 Then, the second main body sheet 64 having a constant thickness is wound around the outer periphery of the first main body sheet 62, and the first main body sheet 62 and the second main body sheet 64 form the first main body layer 76. For this reason, the outer peripheral surface of the first main body layer 76 has substantially the same taper angle as the outer peripheral surface of the shaft 12.
Further, since the fiber directions of the reinforcing fibers of the first main body sheet 62 and the second main body sheet 64 are shifted, for example, by substantially equal angles in opposite directions with respect to the axial length direction, the torsional rigidity of the shaft 12 is exhibited well. be able to.

第１本体層７６の外周に肉厚が一定の第３本体シート６６を巻回して第２本体層７８を形成する。そして、第２本体層７８の外周面はシャフト１２の外周面を形成し、芯金２０の中心軸Ｃに対して一定のテーパ角度を有する。
なお、このとき、第３本体シート６６の強化繊維の繊維方向は軸長方向であるので、中部領域ＭＳでもシャフト１２の曲げ剛性を良好に発揮させることができる。 A second main body layer 78 is formed by winding a third main body sheet 66 having a constant thickness around the outer periphery of the first main body layer 76. The outer peripheral surface of the second main body layer 78 forms the outer peripheral surface of the shaft 12 and has a constant taper angle with respect to the central axis C of the cored bar 20.
At this time, since the fiber direction of the reinforcing fibers of the third main body sheet 66 is the axial length direction, the bending rigidity of the shaft 12 can be satisfactorily exhibited even in the middle region MS.

第４前部補強シート４８は、第１から第３前部補強シート４２，４４，４６、第１から第３本体シート６２，６４，６６の先端に第４前部補強シート４８の先端を合わせた状態で第３本体シート６６の外周に巻回される。このため、第４前部補強シート４８で第２本体層７８の先端部外周に第２前部補強層８０を形成している。   The fourth front reinforcing sheet 48 is aligned with the tips of the first to third front reinforcing sheets 42, 44, 46 and the first to third main body sheets 62, 64, 66. In this state, it is wound around the outer periphery of the third main body sheet 66. For this reason, a second front reinforcing layer 80 is formed on the outer periphery of the distal end portion of the second main body layer 78 by the fourth front reinforcing sheet 48.

そして、通常の成形と同様に、第２本体層７８及び第２前部補強層８０の外側からテーピングにより締め付け成型、芯金２０及びシャフト１２の加熱硬化、芯金２０の除去、テーピングのテープの除去、研磨等により、ゴルフクラブ用シャフト１２を得ることができる。   Then, in the same manner as in normal molding, from the outside of the second main body layer 78 and the second front reinforcing layer 80, it is clamped and molded by taping, the core bar 20 and the shaft 12 are heat-cured, the core bar 20 is removed, and the taping tape is removed. The golf club shaft 12 can be obtained by removal, polishing, or the like.

図４に示すように、シャフト１２の内側から除去された芯金２０の第１テーパ部２２及び第２テーパ部２４の外周に対応する位置には第１から第３の前部補強シート４２，４４，４６により第１前部補強層７２が形成されている。さらに、第４前部補強シート４８により第２前部補強層８０が形成されている。すなわち、シャフト１２の前部領域ＦＳは、第２本体層７８の第３本体シート６６だけでなく、軸長方向に強化繊維の繊維方向を有する第１前部補強層７２及び第２前部補強層８０によって、図５に示すように、第３本体シート６６だけで曲げに対抗する中部領域ＭＳよりも曲げに対する耐性が強化されている。
なお、前部領域ＦＳは、シャフト１２の先端１２ａ側（ＴＩＰ側）の方が中部領域ＭＳに近接した位置（ＢＵＴＴ側）よりも曲げ剛性が高い。これは、芯金２０の第１テーパ部２２のテーパ角度が小さいので、第１テーパ部２２の外側に巻回される第１から第３の前部補強シート４２，４４，４６の外径が大きくなっても曲げ剛性の増大量が小さいことに加え、略三角形状の第４前部補強シート４８を第３本体シート５６の外側に巻回したときに、先端１２ａ側の巻回面積が後端１２ｂ側の巻回面積よりも大きいことによる。
また、第４前部補強シート４８によって外径を調整している。このため、シャフト１２の先端（第１前部補強層７２及び第２前部補強層８０）１２ａがヘッド１４のホーゼル１４ａ内に差し込まれて固定された状態でゴルフクラブ１０をスイングしても、シャフト１２を良好な状態に維持することができる。 As shown in FIG. 4, first to third front reinforcing sheets 42 are disposed at positions corresponding to the outer circumferences of the first tapered portion 22 and the second tapered portion 24 of the cored bar 20 removed from the inside of the shaft 12. A first front reinforcing layer 72 is formed by 44 and 46. Further, a second front reinforcing layer 80 is formed by the fourth front reinforcing sheet 48. That is, the front region FS of the shaft 12 includes not only the third main body sheet 66 of the second main body layer 78 but also the first front reinforcing layer 72 and the second front reinforcing member having the fiber direction of the reinforcing fibers in the axial length direction. As shown in FIG. 5, the layer 80 has a higher resistance to bending than the middle region MS that resists bending with the third main body sheet 66 alone.
Note that the front region FS has higher bending rigidity on the tip 12a side (TIP side) of the shaft 12 than at a position (BUTT side) close to the middle region MS. This is because the taper angle of the first taper portion 22 of the metal core 20 is small, so that the outer diameters of the first to third front reinforcing sheets 42, 44, 46 wound around the outside of the first taper portion 22 are small. In addition to a small increase in flexural rigidity even when it is increased, when the substantially triangular fourth front reinforcing sheet 48 is wound outside the third main body sheet 56, the winding area on the front end 12a side is reduced. This is because it is larger than the winding area on the end 12b side.
Further, the outer diameter is adjusted by the fourth front reinforcing sheet 48. For this reason, even if the golf club 10 is swung in a state where the tips (first front reinforcing layer 72 and second front reinforcing layer 80) 12a of the shaft 12 are inserted and fixed in the hosel 14a of the head 14, The shaft 12 can be maintained in a good state.

芯金２０の第４テーパ部２８及び第５テーパ部３０の外周に対応する位置には第１から第３の後部補強シート５２，５４，５６により後部補強層７４が形成されている。すなわち、シャフト１２の後部領域ＢＳは、第２本体層７８の第３本体シート６６だけでなく、軸長方向に強化繊維の繊維方向を有する後部補強層７４によって、図５に示すように、第３本体シート６６だけで曲げ剛性に対抗する中部領域ＭＳよりも曲げに対する耐性が強化されている。   A rear reinforcing layer 74 is formed by first to third rear reinforcing sheets 52, 54, 56 at positions corresponding to the outer circumferences of the fourth tapered portion 28 and the fifth tapered portion 30 of the cored bar 20. That is, the rear region BS of the shaft 12 is not only the third main body sheet 66 of the second main body layer 78 but also the rear reinforcing layer 74 having the fiber direction of the reinforcing fibers in the axial length direction, as shown in FIG. Bending resistance is strengthened more than the middle region MS that opposes bending rigidity with only the three main body sheet 66.

なお、後部補強層７４はシャフト１２の後端１２ｂ側（ＢＵＴＴ側）の方が中部領域ＭＳに近接した位置（ＴＩＰ側）よりも曲げ剛性が高い。これは、芯金２０の第５テーパ部３０の外側に巻回される第１から第３の後部補強シート５２，５４，５６の外径が大きくなることにより曲げ剛性が増大することの効果が表れている。
同様に、中部領域ＭＳは、シャフト１２の後端１２ｂ側の方が先端１２ａ側よりも曲げ剛性が高い。これは、芯金２０の第３テーパ部２６の外側に巻回される第３の本体シート６６の外径が大きくなることにより曲げ剛性が増大することの効果が表れている。 The rear reinforcing layer 74 has a higher bending rigidity on the rear end 12b side (BUTT side) of the shaft 12 than on a position (TIP side) close to the middle region MS. This is because the bending rigidity is increased by increasing the outer diameters of the first to third rear reinforcing sheets 52, 54, and 56 wound around the fifth tapered portion 30 of the core metal 20. Appears.
Similarly, the middle region MS has higher bending rigidity on the rear end 12b side of the shaft 12 than on the front end 12a side. This shows the effect that the bending rigidity is increased by increasing the outer diameter of the third main body sheet 66 wound around the third tapered portion 26 of the cored bar 20.

以上説明したように、本実施形態では、シャフト１２の曲げ剛性を特定する前部領域ＦＳ、後部領域ＢＳ及び中部領域ＭＳに共通して第３本体シート６６が用いられ、前部領域ＦＳでは第３本体シート６６に加えて第１から第４前部補強シート４２，４４，４６，４８が、後部領域ＢＳでは第３本体シート６６に加えて第１から第３後部補強シート５２，５４，５６が用いられている。このため、中部領域ＭＳよりも前部領域ＦＳ及び後部領域ＢＳの方が曲げ剛性が高くなっている。
したがって、後部領域ＢＳ（後部補強層７４）によりグリップ１６側の剛性がその先端側に隣接する部位（中部領域ＭＳ）に比べて高く形成されている。このため、ゴルフクラブ１０をスイングしたときに、中部領域ＭＳよりもグリップ１６側に剛性を持たせているのでゴルフクラブ１０のコントロールを行い易くすることができるとともに、後部領域ＢＳの先端側に隣接する中部領域ＭＳをグリップ１６側に比べて撓らせることができるので打球を上がり易くすることができる。
また、前部領域ＦＳ（前部補強層７２）によりヘッド１４側の剛性がその後端側に隣接する部位（中部領域ＭＳ）に比べて高く形成されている。このため、ゴルフクラブ１０をスイングしたときに、中部領域ＭＳよりもヘッド１４側に剛性を持たせているのでゴルフクラブ１０のヘッド１４の向きを安定化させることができ、打球のコントロールを容易にすることができる。 As described above, in the present embodiment, the third main body sheet 66 is used in common for the front region FS, the rear region BS, and the middle region MS that specify the bending rigidity of the shaft 12, and in the front region FS, the third body sheet 66 is used. In addition to the third main body sheet 66, the first to fourth front reinforcing sheets 42, 44, 46, and 48 are added to the third main body sheet 66 in the rear region BS, and to the first to third rear reinforcing sheets 52, 54, and 56. Is used. For this reason, the front region FS and the rear region BS have higher bending rigidity than the middle region MS.
Therefore, the rigidity on the grip 16 side is formed higher by the rear region BS (rear reinforcing layer 74) than the portion adjacent to the tip side (the middle region MS). Therefore, when the golf club 10 is swung, the grip 16 side is more rigid than the middle region MS, so that the golf club 10 can be easily controlled and adjacent to the front end side of the rear region BS. Since the middle area MS to be bent can be bent as compared with the grip 16 side, the hitting ball can be easily raised.
Further, the rigidity on the head 14 side is formed higher by the front region FS (front reinforcing layer 72) than the portion adjacent to the rear end side (the middle region MS). For this reason, when the golf club 10 is swung, the head 14 side of the golf club 10 is more rigid than the middle region MS, so that the orientation of the head 14 of the golf club 10 can be stabilized and the hit ball can be easily controlled. can do.

表４には３番アイアンから９番アイアンまでの各番手ごとにシャフト１２に使用する第１から第３前部補強シート４２，４４，４６及び第１から第３の後部補強シート５２，５４，５６の組み合わせを示す。

Figure 2012090730
Table 4 shows the first to third front reinforcing sheets 42, 44, and 46 and the first to third rear reinforcing sheets 52, 54, which are used for the shaft 12 for each of the iron numbers from the third iron to the ninth iron. 56 combinations are shown.
Figure 2012090730

表４に示すように、例えば３番アイアンの場合、第１から第３前部補強シート４２，４４，４６は表２に示すＦ１からＦ３のうち、目付量及びシート厚さが共通であるが繊維弾性率が３つのうちで最も低いＦ１が用いられる。第１から第３後部補強シート５２，５４，５６は表３に示すＢ１からＢ５のうち目付量、シート厚さが小さいＢ１が用いられる。
例えば４番アイアンの場合、第１の前部補強シート４２は表２に示すＦ１からＦ３のうちＦ２が用いられ、第２及び第３の前部補強シート４４，４６は表２に示すＦ１からＦ３のうち、Ｆ１が用いられる。すなわち、第１から第３の前部補強シート４２，４４，４６のうち、１つを変更して前部領域ＦＳの曲げ剛性を３番アイアンと４番アイアンとで変化させている。
一方、第１及び第２の後部補強シート５２，５４は表３に示すＢ１からＢ５のうちＢ２が用いられ、第３の後部補強シート５６は表３に示すＢ１からＢ５のうちＢ１が用いられる。すなわち、第１から第３の後部補強シート５２，５４，５６のうち、２つを変更して後部領域ＢＳの曲げ剛性を３番アイアンと４番アイアンとで変化させている。 As shown in Table 4, for example, in the case of a No. 3 iron, the first to third front reinforcing sheets 42, 44, and 46 have the same basis weight and sheet thickness among F1 to F3 shown in Table 2. F1 having the lowest fiber elastic modulus is used. For the first to third rear reinforcing sheets 52, 54, and 56, B1 having a basis weight and a sheet thickness of B1 to B5 shown in Table 3 is used.
For example, in the case of a 4 iron, the first front reinforcing sheet 42 is F2 among F1 to F3 shown in Table 2, and the second and third front reinforcing sheets 44 and 46 are from F1 shown in Table 2. Of F3, F1 is used. That is, one of the first to third front reinforcing sheets 42, 44, and 46 is changed to change the bending rigidity of the front region FS between the third iron and the fourth iron.
On the other hand, B2 of B1 to B5 shown in Table 3 is used for the first and second rear reinforcing sheets 52 and 54, and B1 of B1 to B5 shown in Table 3 is used for the third rear reinforcing sheet 56. . That is, two of the first to third rear reinforcing sheets 52, 54, and 56 are changed to change the bending rigidity of the rear region BS between the third iron and the fourth iron.

そして、番手が上がるにつれて前部補強シート４２，４４，４６を順に１枚ずつ変更し、後部補強シート５２，５４，５６を順に２枚ずつ変更することにより、同一サイズ、同一形状の芯金２０を用いて各番手のシャフト１２を作製することができる。本実施形態では３番アイアンから９番アイアンまで同一サイズ、同一形状を有する芯金２０を用いるので、製造精度のバラツキを抑制できる。   Then, the front reinforcing sheets 42, 44, and 46 are sequentially changed one by one as the count goes up, and the rear reinforcing sheets 52, 54, and 56 are changed two by two in order, whereby the core bar 20 having the same size and the same shape is changed. Can be used to make the shaft 12 of each count. In the present embodiment, since the cored bar 20 having the same size and the same shape from the 3rd iron to the 9th iron is used, variations in manufacturing accuracy can be suppressed.

そして、表４に示すように、前側の番手に隣接する後側の番手では、第１から第３の前側補強プリプレグシート４２，４４，４６のうち、１枚を変更し、その１枚は繊維弾性率を高くしている。また、前側の番手に隣接する後側の番手では、第１から第３の後側補強プリプレグシート５２，５４，５６のうち、２枚を変更し、その２枚の目付量を大きくし、シート厚さを厚くしている。すなわち、シャフト１２の前部領域ＦＳは内側ほど繊維弾性率が大きく、後部領域ＢＳは外側ほど目付量が小さい。このため、前部領域ＦＳでは繊維弾性率で曲げ剛性に差を出し、後部領域ＢＳは目付量及びシート厚さで曲げ剛性に加えて重量に差を出している。また、シャフト１２の前部領域ＦＳ及び後部領域ＢＳは、隣接する番手間で少なくとも１つの同一のプリプレグシート（積層数、軸方向長さ、材質が共通のもの）を用いている。このため、ゴルファーがスイングしたときの感覚の差を、隣接する番手間で適宜に設定でき（選択するプリプレグシートによって差を大きくも小さくもできる）、隣接する番手で異なる特性にすることができる。   And, as shown in Table 4, in the rear count adjacent to the front count, one of the first to third front reinforcing prepreg sheets 42, 44, 46 is changed, one of which is a fiber The elastic modulus is increased. Further, in the rear count adjacent to the front count, two of the first to third rear reinforcing prepreg sheets 52, 54, 56 are changed to increase the basis weight of the two sheets, The thickness is increased. That is, the front area FS of the shaft 12 has a larger fiber elastic modulus as it is closer to the inner side, and the rear area BS has a smaller basis weight as it is closer to the outer side. For this reason, in the front area FS, a difference in bending rigidity is given by the fiber elastic modulus, and in the rear area BS, a difference is given in weight in addition to the bending rigidity by the basis weight and the sheet thickness. In addition, the front region FS and the rear region BS of the shaft 12 use at least one identical prepreg sheet (having the same number of layers, axial length, and material) between adjacent counts. For this reason, the difference in feeling when the golfer swings can be set as appropriate between adjacent counts (the difference can be increased or decreased depending on the prepreg sheet to be selected), and different characteristics can be set between adjacent counts.

本実施形態では、３番アイアン用のシャフトから９番アイアン用のシャフトまで、図５に示すような特性が得られる。図５中の横軸はシャフト１２の先端１２ａからの位置であり、縦軸はシャフト１２の曲げ剛性（ＥＩ）を示す。   In the present embodiment, characteristics as shown in FIG. 5 are obtained from the shaft for the 3 iron to the shaft for the 9 iron. The horizontal axis in FIG. 5 indicates the position from the tip 12a of the shaft 12, and the vertical axis indicates the bending rigidity (EI) of the shaft 12.

前部領域ＦＳ及び後部領域ＢＳの曲げ剛性を、ゴルフクラブ１０の番手が大きくなるにしたがって同じかそれよりも高くしている。本実施形態に係るシャフト１２は表４に示すプリプレグシートを用いることによって、図５に示すように、低番手（番手が小さい）ほど前部領域ＦＳ及び後部領域ＢＳを適宜の剛性差で軟らかくでき、高番手（番手が大きい）ほど前部領域ＦＳ及び後部領域ＢＳのシャフト１２を適宜の剛性差で硬くできる。前部領域ＦＳの曲げ剛性は例えば１６Ｎ・ｍ２から６０Ｎ・ｍ２の範囲程度であり、後部領域ＢＳの曲げ剛性は例えば２８Ｎ・ｍ２から１６０Ｎ・ｍ２の範囲程度である。そして、図５中のシャフト１２の先端１２ａから１００ｍｍの位置にある前部領域ＦＳでは、隣接する番手に対して例えば２Ｎ・ｍ２から３Ｎ・ｍ２の範囲程度の差がある。また、図５中のシャフト１２の先端１２ａから８００ｍｍの位置にある後部領域ＢＳでは、隣接する番手に対して例えば６Ｎ・ｍ２から８Ｎ・ｍ２の範囲程度の差がある。
そして、後部領域ＢＳの方が前部領域ＦＳに比べて曲げ剛性の増大量（増大率）が大きい。また、図５に示すように、シャフト１２の先端１２ａ側（前部領域ＦＳ）よりも後端１２ｂ側（後部領域ＢＳ）の方が曲げ剛性が相対的に高い。このため、ゴルフクラブ１０をスイングしたときに、曲げ剛性が高いゴルフクラブ１０のグリップ１６側（後端側）でのコントロールが確実に行え、前部（先端側）がグリップ１６側（手元側）よりも撓るので打球を上がり易くすることができる。 The bending rigidity of the front region FS and the rear region BS is the same or higher as the golf club 10 has a larger count. By using the prepreg sheet shown in Table 4, the shaft 12 according to the present embodiment can soften the front region FS and the rear region BS with an appropriate rigidity difference as the number is lower (the number is smaller) as shown in FIG. The shafts 12 in the front region FS and the rear region BS can be hardened with an appropriate rigidity difference as the count is higher (the count is larger). Bending stiffness of the front region FS is about the range, for example, from 16N · m 2 of 60N · m 2, the bending stiffness of the rear region BS is approximately ranging from, for example 28N · m 2 of 160 N · m 2. In the front region FS at a position of 100 mm from the tip 12a of the shaft 12 in FIG. 5, there is a difference of about 2N · m 2 to 3N · m 2 with respect to the adjacent count. Further, in the rear area BS in position 800mm from the front end 12a of the shaft 12 in FIG. 5, there is a difference of about ranging from relative to adjacent count e.g. 6N · m 2 of 8N · m 2.
The rear region BS has a larger amount of increase in flexural rigidity (increase rate) than the front region FS. Further, as shown in FIG. 5, the bending rigidity is relatively higher on the rear end 12b side (rear region BS) than on the front end 12a side (front region FS) of the shaft 12. For this reason, when the golf club 10 is swung, the golf club 10 having high bending rigidity can be reliably controlled on the grip 16 side (rear end side), and the front portion (front end side) is on the grip 16 side (hand side). Since it bends more, a hitting ball can be made easy to go up.

一方、シャフト１２の中部領域ＭＳは、３番アイアンから９番アイアンまで組成が全く同一の第１から第３の本体シート６２，６４，６６を用いている。このため、中部領域ＭＳの曲げ剛性（撓り易さ）及び軸方向長さは番手ごとに異なることはない。ただし、中部領域ＭＳの曲げ剛性は製造精度にもよるが、例えば±０．５Ｎ・ｍ２程度の誤差は十分に許容できる。
このように、シャフト１２の中部領域ＭＳを各番手で共通化したので、ゴルフクラブ１０をスイングしたときの中部領域ＭＳでの撓り（軟らかさ）を同一にすることができる。したがって、スイング時に中部領域ＭＳによりゴルファーに与える感触（例えば撓り性や柔らかさ）を略同一にすることができる。
そして、前部領域ＦＳ及び後部領域ＢＳの外周にプリプレグを巻回することにより前部領域ＦＳと後部領域ＢＳとの間に中部領域ＭＳが形成されるので、中部領域ＭＳの曲げ剛性を前部領域ＦＳ及び後部領域ＢＳに比べて低くでき、シャフト１２の中部領域ＭＳをスイング時に最も撓み易くし、前部領域ＦＳ及び後部領域ＢＳを中部領域ＭＳよりも撓み難くすることができる。また、シャフト１２のうち、中部領域ＭＳをシャフト１２のうちで最も曲げ剛性が低い領域としたことによって、より確実に前部領域ＦＳと中部領域ＭＳとの間、中部領域ＭＳと後部領域ＢＳとの間の曲げ剛性の差を認識し易くすることができる。 On the other hand, the middle region MS of the shaft 12 uses the first to third main body sheets 62, 64, 66 having the same composition from the 3rd iron to the 9th iron. For this reason, the bending rigidity (ease of bending) and the axial length of the middle region MS are not different for each count. However, although the bending rigidity of the middle region MS depends on manufacturing accuracy, for example, an error of about ± 0.5 N · m 2 can be sufficiently allowed.
As described above, since the middle region MS of the shaft 12 is shared by the respective iron numbers, the bending (softness) in the middle region MS when the golf club 10 is swung can be made the same. Therefore, the feel (for example, flexibility and softness) given to the golfer by the middle region MS during the swing can be made substantially the same.
Since the middle region MS is formed between the front region FS and the rear region BS by winding the prepreg around the outer periphery of the front region FS and the rear region BS, the bending rigidity of the middle region MS is set to the front portion. It can be made lower than the region FS and the rear region BS, and the middle region MS of the shaft 12 can be most easily bent during the swing, and the front region FS and the rear region BS can be made more difficult to bend than the middle region MS. Further, by making the middle region MS of the shaft 12 the region having the lowest bending rigidity of the shaft 12, the middle region MS and the rear region BS can be more reliably between the front region FS and the middle region MS. It is possible to easily recognize the difference in bending stiffness between the two.

そして、各シャフト１２は、低番手（例えば３番アイアン）ほど前部領域ＦＳ、中部領域ＭＳ及び後部領域ＢＳにおける曲げ剛性値の差が小さく、高番手（例えば９番アイアン）ほど曲げ剛性値の差が大きい。このため、曲げ剛性値が相対的に大きい高番手ほどスイング時にシャフト１２が硬くなるはずであるが、中部領域ＭＳ（シャフト１２の全長における略２５％から略５０％の範囲）の曲げ剛性値を番手によらず略同一にしたので、スイング時に高番手ほどシャフト１２の中部領域ＭＳの曲がり（柔らかさ）を感じ易くなる。
一方、スイング時に低番手ほどシャフト１２が柔らかいはずであるが、曲げ剛性差が高番手から低番手に移行するにつれて小さくなるので、スイング時に高番手から低番手に移行するにつれて中部領域ＭＳの柔らかさを感じ難くすることができる。このため、相対的に高番手ほどスイング時に中部領域ＭＳの柔らかさを感じ易く、低番手ほどスイング時に中部領域ＭＳの柔らかさを感じ難くすることができるので、高番手のシャフト１２は低番手のスイングタイミングに、低番手のシャフト１２は高番手のスイングタイミングに近づけることができる。したがって、本実施形態によれば、同一のタイミングでスイングし易いゴルフクラブセット（シャフトセット）を提供できる。すなわち、シャフト１２の特性を一定のフローに基づいて設定することができる。
そして、中部領域ＭＳは他の領域（前部領域ＦＳ及び後部領域ＢＳ）に比べて曲げ剛性値が小さいので、シャフト１２の曲がりを中部領域ＭＳで最も感じ易く、スイングのタイミングを調整し易い。 Each shaft 12 has a lower bending rigidity value in the front region FS, the middle region MS, and the rear region BS as the number is lower (for example, the third iron), and the bending rigidity value is higher as the number is higher (for example, the ninth iron). The difference is big. For this reason, the higher the number of the bending rigidity value, the higher the number of the shaft 12 should be harder at the time of swinging. However, the bending rigidity value of the middle region MS (about 25% to about 50% of the total length of the shaft 12) Since it is substantially the same regardless of the count, the higher the count, the easier it is to feel the bending (softness) of the middle region MS of the shaft 12 during the swing.
On the other hand, the shaft 12 should be softer at the lower count at the time of swing, but the bending rigidity difference becomes smaller as the shift from the higher count to the lower count is performed. Can be difficult to feel. For this reason, it is easier to feel the softness of the middle region MS during the swing as the higher count, and the softness of the middle region MS is less likely to be felt during the swing as the lower count, so At the swing timing, the low count shaft 12 can be brought close to the high count swing timing. Therefore, according to the present embodiment, it is possible to provide a golf club set (shaft set) that is easy to swing at the same timing. That is, the characteristics of the shaft 12 can be set based on a certain flow.
Since the middle region MS has a smaller bending rigidity value than the other regions (the front region FS and the rear region BS), the bending of the shaft 12 is most easily felt in the middle region MS, and the swing timing is easily adjusted.

したがって、高番手のシャフト１２ほどシャフト１２が硬く撓り難く、打球時にヘッド１４の向きを安定させることができるが、低番手のシャフト１２をスイングする感じに近づけた状態でスイングを行うことができる。また、低番手ほどシャフト１２が軟らかいので、ヘッド１４のフェース１４ｂが上側を向き易く、打出し角を大きく出来、打球を上がり易くすることができるが、高番手のシャフト１２をスイングする感じに近づけた状態でスイングを行うことができる。   Accordingly, the higher the numbered shaft 12, the harder the shaft 12 is to bend, and the direction of the head 14 can be stabilized at the time of hitting the ball, but the swing can be performed with the low numbered shaft 12 approaching the feeling of swinging. . Further, the lower the count, the softer the shaft 12, the face 14b of the head 14 can easily face upward, the launch angle can be increased, and the hitting ball can be lifted easily. Swing can be performed in the state.

本実施形態では各番手のシャフト１２の長さＬは、後部領域ＢＳを切断することで調整されることが好ましい。したがって、重量調整をシャフト１２の先端側では行わず、後端側で行うことによって、番手ごとに重心位置のフローを容易に設定できる。
もちろん、前部領域ＦＳ及び後部領域ＢＳの両者、又は前部領域ＦＳだけを切断することによりシャフト１２の長さＬを調整するようにしても良い。ただし、長さの調整は各番手で同様の加工（例えば３番アイアンで後部領域ＢＳを切断する加工をするのであれば、４番アイアンから９番アイアンでも同様に後部領域ＢＳを切断する加工）がなされることがシャフト１２の特性（フロー）を揃える観点から好ましい。 In this embodiment, it is preferable that the length L of each shaft 12 is adjusted by cutting the rear region BS. Therefore, by adjusting the weight on the rear end side instead of on the front end side of the shaft 12, the flow of the center of gravity can be easily set for each count.
Of course, the length L of the shaft 12 may be adjusted by cutting both the front region FS and the rear region BS, or only the front region FS. However, the length adjustment is the same for each count (for example, if the rear area BS is cut with a 3 iron, the rear area BS is similarly cut with a 4 to 9 iron) It is preferable from the viewpoint of aligning the characteristics (flow) of the shaft 12.

以上説明したように、本実施形態に係る、中部領域ＭＳを前部領域ＦＳや後部領域ＢＳよりも曲げ剛性を低くしたシャフト１２を用いることにより、ゴルフクラブ１０のスイング時に打球を上げ易いが、ヘッド１４の向きを安定化したゴルフクラブ１０を提供できる。
そして、本実施形態に係るシャフト１２は、３番アイアンから９番アイアンまで曲げ剛性が共通の中部領域ＭＳがあり、その前方の前部領域ＦＳ、その後方の後部領域ＢＳともに番手が小さいほど軟らかくしている。このため、番手が小さいほどヘッド１４のフェース１４ｂが上を向き易く、打ち出し角を大きくでき、打球を上がり易くできる。一方、番手が大きいほど硬く、打球時にヘッド１４のフェース１４ｂの向きを安定させることができるので、打球の方向をより安定させることができる。
また、中部領域ＭＳの曲げ剛性は番手によらず共通化しているので、ゴルフクラブ１０をスイングしたときに、中部領域ＭＳからゴルファーの手に伝えられる感覚を常に同じ状態にすることができる。 As described above, according to the present embodiment, it is easy to raise the hit ball during the swing of the golf club 10 by using the shaft 12 having the middle region MS whose bending rigidity is lower than that of the front region FS and the rear region BS. The golf club 10 in which the orientation of the head 14 is stabilized can be provided.
The shaft 12 according to the present embodiment has the middle region MS having the same bending rigidity from the 3rd iron to the 9th iron, and the front region FS in the front and the rear region BS in the rear thereof are both softer as the number is smaller. is doing. For this reason, the smaller the count, the easier the face 14b of the head 14 faces upward, the launch angle can be increased, and the hit ball can be raised easily. On the other hand, the larger the number, the harder it is and the direction of the face 14b of the head 14 can be stabilized at the time of hitting, so that the direction of the hitting ball can be made more stable.
Further, since the bending rigidity of the middle region MS is made common regardless of the count, when the golf club 10 is swung, the feeling transmitted from the middle region MS to the golfer's hand can always be in the same state.

なお、シャフト１２の前部領域ＦＳに用いるプリプレグシート４２，４４，４６に用いる繊維弾性率の差を隣接する番手間で大きくすれば、特性が大きく異なるシャフト１２を得ることができ、繊維弾性率の差を隣接する番手間で小さくすれば、隣接する番手間で特性を近づけることができる。
同様に、後部領域ＢＳに用いるプリプレグシート５２，５４，５６に用いる目付量、シート厚さの差を隣接する番手間で大きくすれば、特性が大きく異なるシャフト１２を得ることができ、目付量、シート厚さの差を隣接する番手間で小さくすれば、隣接する番手間で特性を近づけることができる。 In addition, if the difference in the fiber elastic modulus used for the prepreg sheets 42, 44, and 46 used in the front region FS of the shaft 12 is increased between adjacent counts, the shaft 12 having greatly different characteristics can be obtained, and the fiber elastic modulus If the difference is reduced between adjacent counts, the characteristics can be made closer between adjacent counts.
Similarly, if the basis weight used for the prepreg sheets 52, 54, and 56 used for the rear region BS and the difference in sheet thickness are increased between adjacent counts, a shaft 12 having greatly different characteristics can be obtained, and the basis weight, If the difference in sheet thickness is reduced between adjacent counts, the characteristics can be made closer between adjacent counts.

次に、第２実施形態について図６を用いて説明する。この実施形態は第１実施形態の変形例であって、第１実施形態で説明した部材と同一の部材には同一の符号を付し、詳しい説明を省略する。   Next, a second embodiment will be described with reference to FIG. This embodiment is a modification of the first embodiment, and the same members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

第１実施形態で説明した各番手のゴルフクラブ１０のシャフト１２は、前部領域ＦＳ及び後部領域ＢＳの両者の補強プリプレグが共に３枚ずつであるのに対し、図６に示す本実施形態の各番手のゴルフクラブ１０のシャフト１２は、前部領域ＦＳ及び後部領域ＢＳの両者の補強プリプレグが共に１枚である。   The shaft 12 of each of the count golf clubs 10 described in the first embodiment has three reinforcing prepregs in both the front region FS and the rear region BS, whereas in the present embodiment shown in FIG. The shaft 12 of each count golf club 10 has one reinforcing prepreg for both the front region FS and the rear region BS.

例えば前部領域ＦＳの補強用プリプレグシート４２は、３番アイアンよりも４番アイアンの方が繊維弾性率が高いものが用いられる。このとき、目付量やシート厚さは略同一であることが好ましい。この関係は４番アイアンと５番アイアン、５番アイアンと６番アイアン、…、８番アイアンと９番アイアンでも同様である。このため、番手が大きくなるにしたがってシャフト１２の前部領域ＦＳの曲げ剛性が大きくなる。なお、目付量やシート厚さは各番手で略同一であるので、前部領域ＦＳの重量変化は低く抑えられる。   For example, as the reinforcing prepreg sheet 42 in the front region FS, a material having a higher fiber elastic modulus is used for the 4th iron than for the 3rd iron. At this time, the basis weight and the sheet thickness are preferably substantially the same. This relationship is the same for 4 irons, 5 irons, 5 irons and 6 irons,..., 8 irons and 9 irons. For this reason, the bending rigidity of the front region FS of the shaft 12 increases as the count increases. Since the basis weight and the sheet thickness are substantially the same for each count, the weight change of the front region FS can be kept low.

例えば後部領域ＢＳの補強用プリプレグシート５２は、３番アイアンよりも４番アイアンの方が目付量が大きく、シート厚さが厚いものが用いられる。このとき、繊維弾性率は略同一であることが好ましい。この関係は４番アイアンと５番アイアン、５番アイアンと６番アイアン、…、８番アイアンと９番アイアンでも同様である。このため、番手が大きくなるにしたがってシャフト１２の後部領域ＢＳの曲げ剛性が大きくなるとともに、後部領域ＢＳの重量が大きくなる。したがって、シャフト１２の重量調整を後部領域ＢＳで行うことができる。   For example, as the reinforcing prepreg sheet 52 in the rear region BS, a sheet having a larger basis weight and a larger sheet thickness is used for the fourth iron than for the third iron. At this time, it is preferable that the fiber elastic modulus is substantially the same. This relationship is the same for 4 irons, 5 irons, 5 irons and 6 irons,..., 8 irons and 9 irons. For this reason, the bending rigidity of the rear region BS of the shaft 12 increases as the count increases, and the weight of the rear region BS increases. Therefore, the weight adjustment of the shaft 12 can be performed in the rear region BS.

なお、本実施形態では、前部領域ＦＳ及び後部領域ＢＳ共に繊維方向が軸長方向の１枚の補強用プリプレグシート４２，５２を用いる例として説明したが、前部領域ＦＳに繊維方向が軸長方向の３枚等の複数枚の補強用プリプレグシートを用い、後部領域ＢＳに繊維方向が軸長方向の１枚の補強用プリプレグシートを用いてシャフト１２を形成しても良い。また、前部領域ＦＳに繊維方向が軸長方向の１枚の補強用プリプレグシートを用い、後部領域ＢＳに繊維方向が軸長方向の３枚等の複数枚の補強用プリプレグシートを用いてシャフト１２を形成しても良い。複数枚の補強用プリプレグシートを用いてシャフト１２を形成する場合、隣接する番手のシャフトを作製する際にそのうちの１枚又は２枚のプリプレグシートを番手が大きくなる場合は曲げ剛性が高いものに、番手が小さくなる場合は曲げ剛性が小さいものを用いる。   In the present embodiment, the front region FS and the rear region BS have been described as an example using one reinforcing prepreg sheet 42, 52 in which the fiber direction is the axial length direction, but the fiber direction is axial in the front region FS. The shaft 12 may be formed by using a plurality of reinforcing prepreg sheets such as three in the long direction and using one reinforcing prepreg sheet whose fiber direction is the axial direction in the rear region BS. Further, a shaft using a single reinforcing prepreg sheet whose fiber direction is the axial length direction in the front region FS and a plurality of reinforcing prepreg sheets such as three whose fiber direction is the axial direction is used in the rear region BS. 12 may be formed. When the shaft 12 is formed by using a plurality of reinforcing prepreg sheets, when one or two of the adjacent prepreg sheets are produced, if the number of the prepreg sheets is large, the bending rigidity is high. When the count is small, the one with low bending rigidity is used.

したがって、中部領域ＭＳでは番手によらず曲げ剛性が共通で、前部領域ＦＳ及び後部領域ＢＳで番手が高くなるにつれて曲げ剛性を高くしたことによって、中部領域ＭＳで共通した撓り性を得つつ、３番より４番が、４番よりも５番が、…、８番よりも９番アイアンをスイング時に曲げ難くすることができる。
一方、第１実施形態で説明したように、中部領域ＭＳによって、相対的に高番手ほどスイング時の柔らかさを感じ易く、低番手ほどスイング時の柔らかさを感じ難くすることができるので、同一のタイミングでスイングし易いゴルフクラブセット（シャフトセット）を提供できる。 Therefore, the middle region MS has the same bending rigidity regardless of the count, and the bending stiffness is increased as the number is increased in the front region FS and the rear region BS, thereby obtaining a common flexibility in the middle region MS. No. 3, No. 4, No. 4, No. 5, ..., No. 8, No. 9 Iron can be made difficult to bend during swing.
On the other hand, as described in the first embodiment, the middle region MS makes it easier to feel the softness at the time of swing as the higher count, and the softness at the time of the swing is less likely to be felt as the lower count. It is possible to provide a golf club set (shaft set) that is easy to swing at this timing.

次に、第３実施形態について図７を用いて説明する。この実施形態は第１及び第２実施形態の変形例である。   Next, a third embodiment will be described with reference to FIG. This embodiment is a modification of the first and second embodiments.

図７に示す芯金１２０は、第１及び第２実施形態の芯金２０とは中間領域ＭＭ及び後方領域ＢＭの長さが異なる。
図３に示す第１実施形態では、シャフト１２の前部領域ＦＳの長さは芯金２０の全長の略２５％程度、中部領域ＭＳの長さは芯金２０の全長の略２５％程度、後方領域ＢＭ（第４テーパ部２８及び第５テーパ部３０）の長さ割合は略５０％程度であると説明した。
これに対して、本実施形態の芯金１２０は、図７に示すように、中間領域ＭＭ（第３テーパ部１２６）の長さ割合を略３５％程度にし、後方領域ＢＭ（第４テーパ部１２８及び第５テーパ部１３０）の長さ割合を略４０％程度にした例である。このため、この芯金１２０を用いて作製されるシャフト１２も、前部領域ＦＳの長さ割合が略２５％程度、後部領域ＢＳの長さ割合が略４０％程度、中部領域ＭＳの長さ割合が略３５％程度である。すなわち、シャフト１２の先端１２ａを０％、後端１２ｂを１００％としたときに、前部領域ＦＳは０％から略２５％の位置に、中部領域ＭＳは略２５％から略６０％の位置に、後部領域ＢＳは略６０％から１００％の位置にある。 The cored bar 120 shown in FIG. 7 differs from the cored bar 20 of the first and second embodiments in the length of the intermediate region MM and the rear region BM.
In the first embodiment shown in FIG. 3, the length of the front region FS of the shaft 12 is about 25% of the total length of the core metal 20, and the length of the middle region MS is about 25% of the total length of the core metal 20, It has been described that the length ratio of the rear region BM (the fourth taper portion 28 and the fifth taper portion 30) is approximately 50%.
On the other hand, as shown in FIG. 7, the cored bar 120 of the present embodiment has a length ratio of the intermediate region MM (third tapered portion 126) of about 35%, and a rear region BM (fourth tapered portion). This is an example in which the length ratio of 128 and the fifth taper portion 130) is about 40%. For this reason, the shaft 12 manufactured using the core metal 120 also has a length ratio of the front area FS of about 25%, a length ratio of the rear area BS of about 40%, and the length of the middle area MS. The ratio is about 35%. That is, when the front end 12a of the shaft 12 is 0% and the rear end 12b is 100%, the front region FS is a position from 0% to about 25%, and the middle region MS is a position from about 25% to about 60%. In addition, the rear region BS is at a position of approximately 60% to 100%.

したがって、本実施形態に係る芯金１２０を用いてシャフト１２を作製する場合、中部領域ＭＳが芯金１２０の中間領域ＭＭの長さ割合に合わせて長くなり、後部領域ＢＳが芯金１２０の後方領域ＢＭの長さ割合に合わせて短くなる。この場合も、シャフト１２の中部領域ＭＳでは番手によらず曲げ剛性が共通で、前部領域ＦＳ及び後部領域ＢＳで番手が高くなるにつれて曲げ剛性を高くしたことによって、中部領域ＭＳで共通した撓り性を得つつ、３番より４番アイアンを、４番よりも５番アイアンを、…、８番よりも９番アイアンを硬く形成し曲げ難くすることができる。
一方、第１実施形態で説明したように、シャフト１２の先端１２ａ側から略２５％から略６０％の範囲に設けた中部領域ＭＳによって、シャフト１２の先端１２ａ側（ヘッド１４側）及び後端１２ｂ側（グリップ１６側）の曲げ剛性を図５に示す状態と同様の傾向を得る状態に保つことができる。このため、曲げ剛性が低い中部領域ＭＳを作製しつつ、中部領域ＭＳよりも高い曲げ剛性を有する前部領域ＦＳ及び後部領域ＢＳを第１実施形態で説明したのと同様に作製することができるので、中部領域ＭＳで撓り感を得つつ、相対的に高番手ほどスイング時の柔らかさを感じ易く、低番手ほどスイング時の柔らかさを感じ難くすることができる。したがって、同一のタイミングでスイングし易いゴルフクラブセット（シャフトセット）を提供できる。 Therefore, when the shaft 12 is manufactured using the core bar 120 according to the present embodiment, the middle region MS becomes longer in accordance with the length ratio of the intermediate region MM of the core bar 120, and the rear region BS is behind the core bar 120. It becomes shorter according to the length ratio of the region BM. Also in this case, the bending rigidity common to the middle region MS is obtained by increasing the bending rigidity as the number of the front region FS and the rear region BS is increased in the middle region MS of the shaft 12 regardless of the number. It is possible to make the 4th iron from the 3rd, the 5th iron from the 4th,...
On the other hand, as described in the first embodiment, the front end 12a side (head 14 side) and the rear end of the shaft 12 are provided by the middle region MS provided in the range of about 25% to about 60% from the front end 12a side of the shaft 12. The bending rigidity on the 12b side (grip 16 side) can be maintained in a state in which a tendency similar to the state shown in FIG. 5 is obtained. For this reason, the front region FS and the rear region BS having higher bending stiffness than the middle region MS can be produced in the same manner as described in the first embodiment while producing the middle region MS having low bending stiffness. Therefore, while obtaining a sense of bending in the middle region MS, it is easier to feel the softness during the swing as the higher count, and the softness during the swing is less likely to be felt as the lower count. Therefore, it is possible to provide a golf club set (shaft set) that is easy to swing at the same timing.

これまで、いくつかの実施形態について図面を参照しながら具体的に説明したが、この発明は、上述した実施形態に限定されるものではなく、その要旨を逸脱しない範囲で行なわれるすべての実施を含む。   Although several embodiments have been specifically described so far with reference to the drawings, the present invention is not limited to the above-described embodiments, and all the embodiments performed without departing from the scope of the invention are not limited thereto. Including.

１０…ゴルフクラブ、１２…シャフト、１２ａ…先端、１２ｂ…後端、ＦＳ…前部領域、ＢＳ…後部領域、ＭＳ…中部領域、１４…ヘッド、１４ａ…ホーゼル、１４ｂ…フェース、１６…グリップ、２０…芯金、２０ａ…先端、２０ｂ…後端、２２，２４，２６，２８，３０…テーパ部、２３，２５，２７，２９，３１…変位部、３２…ストレート部、ＦＭ…前方領域、ＢＭ…後方領域、ＭＭ…中間領域、４２…第１前部補強シート、４４…第２前部補強シート、４６…第３前部補強シート、４２ａ，４４ａ，４６ａ…略三角形状部分、４８…第４前部補強シート、５２…第１後部補強シート、５４…第２後部補強シート、５６…第３後部補強シート、５２ａ，５４ａ，５６ａ…略三角形状部分、６２…第１本体プリプレグシート、６４…第２本体プリプレグシート、６６…第３本体プリプレグシート、７２…第１の前部補強層、７２ａ…外径調整層、７４…後部補強層、７４ａ…外径調整層、７６…本体層、７８…本体層、８０…第２前部補強層。   DESCRIPTION OF SYMBOLS 10 ... Golf club, 12 ... Shaft, 12a ... Tip, 12b ... Rear end, FS ... Front region, BS ... Rear region, MS ... Middle region, 14 ... Head, 14a ... Hosel, 14b ... Face, 16 ... Grip, 20 ... core metal, 20a ... tip, 20b ... rear end, 22, 24, 26, 28, 30 ... taper part, 23, 25, 27, 29, 31 ... displacement part, 32 ... straight part, FM ... front region, BM ... rear region, MM ... middle region, 42 ... first front reinforcing sheet, 44 ... second front reinforcing sheet, 46 ... third front reinforcing sheet, 42a, 44a, 46a ... substantially triangular portion, 48 ... Fourth front reinforcing sheet, 52 ... first rear reinforcing sheet, 54 ... second rear reinforcing sheet, 56 ... third rear reinforcing sheet, 52a, 54a, 56a ... substantially triangular portion, 62 ... first body prepreg sheet, 64 ... No. Main body prepreg sheet, 66 ... third main body prepreg sheet, 72 ... first front reinforcing layer, 72a ... outer diameter adjusting layer, 74 ... rear reinforcing layer, 74a ... outer diameter adjusting layer, 76 ... main body layer, 78 ... main body Layer, 80 ... second front reinforcement layer.

Claims (3)

高番手ほど曲げ剛性が高く低番手ほど曲げ剛性が低い複数のシャフトを有するゴルフクラブ用のシャフトセットであって、
前記シャフトは、各番手共に、
先端側から全長の２５〜６０％の範囲に、先端側から後端側に向かうにしたがって曲げ剛性が増大する中部領域と、
前記中部領域の先端側にあって先端側に向かうにしたがって曲げ剛性が増大する前部領域と、
前記中部領域の後端側にあって後端側に向かうにしたがって曲げ剛性が増大する後部領域と
を具備し、
前記中部領域の全長に対する長さは全ての番手で略一致し、
前記中部領域の先端側から後端側に亘る曲げ剛性分布は、全ての番手で略一致し、
前記後部領域は、番手が大きくなるにしたがって前記前部領域よりも曲げ剛性が増大する率を大きくしたことを特徴とするシャフトセット。 A shaft set for a golf club having a plurality of shafts having a higher bending rigidity and a lower bending rigidity.
For each shaft, the shaft
A middle region where the bending rigidity increases from the front end side to the rear end side in a range of 25-60% of the total length from the front end side;
A front region on the distal side of the middle region and having a bending stiffness that increases toward the distal side; and
A rear region which is on the rear end side of the middle region and increases in bending rigidity toward the rear end side, and
The length with respect to the total length of the middle region is approximately the same in all counts,
The bending stiffness distribution from the front end side to the rear end side of the middle region is substantially the same for all the counts,
The shaft set according to claim 1, wherein the rear region has a larger rate of increase in bending rigidity than the front region as the count increases. 前記シャフトのうち、前記中部領域を前記シャフトのうちで最も曲げ剛性が低い領域としたことを特徴とする請求項１に記載のシャフトセット。   The shaft set according to claim 1, wherein the middle region of the shaft is a region having the lowest bending rigidity of the shaft. 請求項１もしくは請求項２に記載のシャフトセットの各シャフトにそれぞれヘッド及びグリップが取り付けられたアイアンセット。   An iron set in which a head and a grip are attached to each shaft of the shaft set according to claim 1 or 2.
JP2010239897A 2010-10-26 2010-10-26 Shaft set for golf club and iron set Pending JP2012090730A (en)

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JP2014108151A (en) * 2012-11-30 2014-06-12 Globeride Inc Golf club set including multiple golf clubs manufactured using mandrel
JP2016019655A (en) * 2014-07-15 2016-02-04 ダンロップスポーツ株式会社 Golf club shaft

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JP2003102884A (en) * 2001-09-28 2003-04-08 Sumitomo Rubber Ind Ltd Golf club shaft and method for manufacturing golf club shaft
JP2003169871A (en) * 2001-09-28 2003-06-17 Mizuno Corp Golf shaft
JP2009240429A (en) * 2008-03-28 2009-10-22 Daiwa Seiko Inc Golf club shaft
JP2010154875A (en) * 2008-12-26 2010-07-15 Bridgestone Sports Co Ltd Shaft set for golf club and club set with it

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JPH07213654A (en) * 1994-02-07 1995-08-15 Somar Corp Golf club shaft set and manufacture thereof
JPH10127838A (en) * 1996-10-30 1998-05-19 Daiwa Seiko Inc Golf club shaft
JPH11155986A (en) * 1997-11-28 1999-06-15 Daiwa Seiko Inc Golf club shaft
JP2000279558A (en) * 1999-03-29 2000-10-10 Mizuno Corp Golf club set and its shaft set
JP2002177423A (en) * 2000-12-12 2002-06-25 Sumitomo Rubber Ind Ltd Golf club shaft and golf club shaft series
JP2003102884A (en) * 2001-09-28 2003-04-08 Sumitomo Rubber Ind Ltd Golf club shaft and method for manufacturing golf club shaft
JP2003169871A (en) * 2001-09-28 2003-06-17 Mizuno Corp Golf shaft
JP2009240429A (en) * 2008-03-28 2009-10-22 Daiwa Seiko Inc Golf club shaft
JP2010154875A (en) * 2008-12-26 2010-07-15 Bridgestone Sports Co Ltd Shaft set for golf club and club set with it

Cited By (2)

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Publication number Priority date Publication date Assignee Title
JP2014108151A (en) * 2012-11-30 2014-06-12 Globeride Inc Golf club set including multiple golf clubs manufactured using mandrel
JP2016019655A (en) * 2014-07-15 2016-02-04 ダンロップスポーツ株式会社 Golf club shaft

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