JP2018171391A - Golf shaft for putter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf shaft for putter, enabling correcting a habit of patting of a player, and hitting a ball.SOLUTION: A golf shaft for putter, comprising a plurality of fiber-reinforced resin layers satisfies following formula {120≤W≤160} and following formula {20≤F<70} when a conversion mass of the golf shaft 10 for putter in an entire length L of 915 mm is W(g), and a displacement amount in a cantilever bending test of supporting from a lower side a position A 760 mm from a small diameter end part 11 side of the golf shaft 10 for putter, supporting from an upper side a position B 150 mm from the position A to a large diameter end part 12 side, and applying a load of 3.0 kgf onto a position 10 mm from the small diameter end part 11 side so as to measure a displacement amount at the small diameter end part 11 side is rigidity F(mm). With this, when a player who has a habit of easily hitting to a right side performs patting, a hitting direction is corrected to a roughly straight direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a golf shaft for putter.

  In general, putting in golf has a great influence on the game game as it is called Pattoise Money. Such putting is very difficult because the influence of turf and slope is also entangled with the movement of the ball. In putting, in the true sense, it is difficult to strike the ball accurately and straight, and in many cases, the ball is launched slightly shifted to the left and right. On the other hand, when hitting a ball from the front of the cup, it is often the case that a cup is inserted, but as mentioned above, if a complicated lawn or gradient is involved, a pad that sometimes does not allow a deviation of about 1 mm is allowed. Accuracy is required.

  Until now, steel has been the main material for putter golf shafts. However, in recent years, with the development of material technology, golf shafts for putters composed of fiber-reinforced resin layers have been widely seen in the market. Along with this, there have been some prior studies on putter golf shafts composed of such fiber-reinforced resin layers. For example, the following techniques have been proposed.

First, a technique relating to a putter golf shaft made of a fiber-reinforced resin layer in consideration of the physical aspect of putting has been proposed (see, for example, Patent Document 1).
Patent Document 1 relates to a technique that pays attention to how the shaft bends in order to impart forward rotation (rotation in the rolling direction, top spin) to the ball. Normally, a ball launched by a putter is launched in a state of slightly floating from the ground and in reverse rotation (rotation in the opposite direction to rolling, backspin). After that, from the point where the ball landed on the ground, proceeding to slide on the turf while gradually reducing the reverse rotation due to friction with the turf, eventually turning to the non-rotation phase and rolling by entering the forward rotation phase. Occurs. In the process of changing the ball rotation phase as described above, the directionality is lost due to the influence of random grass. According to the conventional technique described in Patent Document 1, since forward rotation is not necessary for the ball from the beginning (or because the amount of reverse rotation is small), a pattern with excellent ball directionality, that is, line accuracy. It is said that a golf shaft can be provided.

Further, regarding a golf shaft for a putter composed of a fiber reinforced resin layer, a technique that attempts to solve the same problem as that of Patent Document 1 has been proposed by paying attention to the sensory side of the putter (see, for example, Patent Document 2). ).
According to the technique described in Patent Document 2, by using pitch-based carbon fibers having a high elastic modulus as the fiber reinforced resin layer, it is possible to provide a golf shaft for putters that has a different feel to the hand of the player than before. It is said that.

JP 2003-190343 A JP 2012-192074 A

  On the other hand, in golf putting, there is generally a tendency that the direction of the ball is easily removed to either the left or right due to the wrinkles unique to each player. However, it has been difficult to correct such wrinkles unique to each player with the conventional techniques described in Patent Documents 1 and 2 above.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a putter golf shaft capable of correcting a player's putting heel and launching a ball.

As a result of intensive investigations by the present inventors to achieve the above object, the present inventors have found that the overall rigidity of the golf shaft for putter affects the player's performance, thereby completing the present invention.
That is, this invention includes the following aspects.

[1] A golf shaft for putter composed of a plurality of fiber reinforced resin layers, wherein the converted mass of the golf shaft for putter when the total length L is 915 mm is W (g), and the small diameter of the golf shaft for putter A position A of 760 mm from the end side is supported from the lower side, and a position B of 150 mm is supported from the upper side to the large diameter end side from the position A, and 3.0 kgf at a position of 10 mm from the small diameter end side. For the putter that satisfies the following formula (1) and formula (2) when the displacement amount in the cantilever bending test is measured as the rigidity F (mm). Golf shaft.
120 ≦ W ≦ 160 (1)
20 ≦ F <70 (2)
[2] The putter golf shaft according to the above [1], wherein a balance point in a longitudinal axis direction of the putter golf shaft is a position within 55% from the narrow end portion.
[3] The fiber reinforced resin layer includes a stiffness adjusting layer made of a fiber reinforced resin in which the orientation direction of the reinforced fiber with respect to the longitudinal axis direction of the golf shaft for putter is −10 ° to + 10 °, and the stiffness The golf shaft for putters according to the above [1] or [2], wherein 1/3 or more of the total mass of the adjustment layer is made of a fiber reinforced resin having a tensile elastic modulus of reinforcing fibers of 200 GPa to 350 GPa.
[4] Further, as the fiber reinforced resin layer, a fiber reinforced resin in which the orientation direction of the reinforced fiber with respect to the longitudinal axis direction of the golf shaft for putter is 0 ° to ± 75 ° on the inner layer side of the rigidity adjusting layer. And a mass / outer diameter adjusting layer disposed in a position not including the vicinity of the large-diameter end and the vicinity of the small-diameter end in the longitudinal axis direction, and the inner diameter of the small-diameter end is 3. The outer diameter is 0 mm or more and the outer diameter is 10.0 mm or less, and the inner diameter of the large-diameter end is 10.0 mm or more and the outer diameter is 16.0 mm or less. The golf shaft for putters according to [3].

  According to the golf shaft for putters according to the present invention, as described above, by optimizing the range of the converted mass W based on the total length L and the rigidity F, the hitting direction is set to the left as seen from the right-handed player. Easy to launch. As a result, when a player who has a heel that easily removes the hit ball on the right side performs the putting, the hitting direction is corrected in a roughly straight direction. Therefore, it is particularly suitable for a player who can easily remove the hit ball on the right side.

In the Example of the golf shaft for putters concerning this invention, it is a schematic diagram explaining the procedure which manufactured the golf shaft for putters, and is a figure which shows a mandrel and a prepreg. It is a schematic diagram explaining the method to measure the rigidity F of the golf shaft for putters concerning this invention.

  Hereinafter, an embodiment of a golf shaft for putter according to the present invention will be given and described with reference to FIGS. In addition, each drawing used in the following description may show the characteristic part in an enlarged manner for convenience in order to make the feature easy to understand, and the dimensional ratio of each component is different from the actual case. There is. In addition, the materials, dimensions, and the like exemplified in the following description are examples, and the present invention is not limited to them, and can be appropriately changed and implemented without changing the gist thereof.

<Configuration of putter golf shaft>
The golf shaft for putters according to the present invention comprises a plurality of fiber reinforced resin layers, and the converted mass of the golf shaft for putters when the total length L is 915 mm is W (g), and the small diameter end of the golf shaft for putters A position A of 760 mm from the part side is supported from the lower side, a position B of 150 mm is supported from the upper side to the large diameter end part side from the position A, and a load of 3.0 kgf is applied to the position of 10 mm from the small diameter end part side. When the displacement amount by the cantilever bending test in which the displacement amount on the small-diameter end portion side is measured as rigidity F (mm), the following expressions (1) and (2) are satisfied.
120 ≦ W ≦ 160 (1)
20 ≦ F <70 (2)

  As illustrated in FIG. 1, the golf shaft for putter according to the present invention has a mandrel 1 having a fiber reinforced resin layer (prepreg) obtained by impregnating a resin into a sheet-like reinforcing fiber in which fibers are aligned in one direction. It is manufactured by a sheet wrapping method in which the mandrel 1 is pulled out after being wound a plurality of times and then cured by heating.

  Moreover, the golf shaft for putters according to the present invention obtained by the above method is, for example, in the longitudinal direction as in the golf shaft 10 for putters shown in the schematic diagram illustrating the method for measuring the rigidity F in FIG. The tapered shape gradually decreases in diameter from the large-diameter end portion toward the small-diameter end portion.

[Multiple fiber reinforced resin layers]
In the present invention, the fibers used in each of the plurality of fiber reinforced resin layers (see reference numeral 2 in FIG. 1) are, for example, glass fibers, carbon fibers, aramid fibers, silicon carbide fibers, alumina fibers, or steel fibers. Etc. In particular, polyacrylonitrile-based carbon fibers are most preferable because they can constitute a fiber-reinforced plastic layer having excellent mechanical properties. In addition, as a reinforced fiber used for a fiber reinforced resin layer, a single type may be used or two or more types may be used together.

  Although it does not specifically limit as matrix resin used for a fiber reinforced resin layer, Usually, an epoxy resin is used. Examples of such epoxy resins include bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, phenol novolac type epoxy resins, cresol novolac type epoxy resins, glycidyl amine type epoxy resins, and isocyanate modified epoxy resins. Or an alicyclic epoxy resin.

  The epoxy resin can be used from a liquid to a solid one without particular limitation. Furthermore, it is possible to use a single type of epoxy resin or a blend of two or more types of epoxy resins. Moreover, it is more preferable to mix and use a curing agent in the epoxy resin.

  The fiber basis weight, resin content, and the like in the plurality of fiber reinforced resin layers are not particularly limited, and can be appropriately selected according to, for example, the required thickness and winding diameter of each layer.

(Bias layer)
In the golf shaft for putters according to the present invention, it is preferable that a bias layer 21 is provided as a fiber reinforced resin layer provided as the innermost layer.
The bias layer 21 includes, for example, reinforcing fibers oriented at an angle of + 15 ° to + 75 ° with respect to the longitudinal axis direction of the golf shaft for putter, and reinforcing fibers oriented at −15 ° to −75 °. Usually, the absolute values of the positive orientation angle and the negative orientation angle in the bias layer 21 are the same. If the orientation angle of the reinforcing fibers in the bias layer 21 is too small, the bending rigidity of the putter golf shaft is increased, but the torsional rigidity becomes too small. On the other hand, if the orientation angle of the reinforcing fibers in the bias layer 21 is too large, the crushing rigidity of the shaft can be increased, but the torsional rigidity becomes too small.

  Although it does not specifically limit as thickness of the bias layer 21, For example, it can be set as 0.25-0.80 mm. If the bias layer 21 is thinner than the lower limit of the above range, the number of windings may increase too much, or wrinkles may occur when winding. On the other hand, when the bias layer 21 is thicker than the upper limit of the above range, it is necessary to reduce the number of turns in order to reduce the weight of the putter golf shaft. There is.

  In the illustrated example, only one bias layer 21 is provided. However, for example, a structure having two or more layers is also possible. As described above, when two or more bias layers 21 are provided, prepregs having the same absolute value of the positive orientation angle and the negative orientation angle are used as a set. Further, when the bias layer 21 has a multi-layer structure, for example, the above-described positive and negative layers may be shifted and wound.

(Rigidity adjustment layer)
As shown in the schematic diagram of FIG. 1, the golf shaft for putter according to the present invention has a fiber reinforced resin layer 2 in which the orientation direction of reinforcing fibers with respect to the longitudinal axis direction of the golf shaft for putter is −10 ° to + 10 °. It is preferable to include a rigidity adjusting layer 24 made of a fiber reinforced resin. The rigidity adjusting layer 24 illustrated in FIG. 1 is disposed as the outermost layer of the putter golf shaft. Moreover, it is preferable that the rigidity adjusting layer 24 is provided so as to extend substantially in the longitudinal direction of the putter golf shaft.

  In the present invention, from the viewpoint of ensuring the hardness of the golf shaft for putter on a certain level, 1/3 or more of the total mass of the stiffness adjusting layer 24 is made of a fiber reinforced resin having an elastic modulus of 200 GPa to 350 GPa. Is more preferable. More preferably, 2/3 or more of the total mass of the rigidity adjusting layer 24 is made of a fiber reinforced resin having an elastic modulus in the above range, and the entire rigidity adjusting layer 24 is most preferably made of the fiber reinforced resin. preferable. Thus, since at least 1/3 or more of the rigidity adjusting layer 24 is made of a fiber reinforced resin having an elastic modulus in the above range, the entire golf club shaft for the putter is hardly twisted, and the feeling transmitted to the player's hand is also good. It will be something.

  In addition, since the feeling transmitted to a player's hand will change if the elasticity modulus of the rigidity adjustment layer 24 is too high, since it is not preferable, the upper limit shall be 350 GPa. Further, from the viewpoint of improving the feel transmitted to the player's hand, the elastic modulus of the fiber reinforced resin constituting the stiffness adjusting layer 24 is more preferably 300 GPa or less, and most preferably 250 GPa.

(Mass / outer diameter adjustment layer)
In the golf shaft for putters according to the present invention, as the fiber reinforced resin layer 2, the orientation direction of the reinforcing fibers with respect to the longitudinal axis direction of the golf shaft for putters is 0 ° to ± 75 ° on the inner layer side of the rigidity adjusting layer 24. It is preferable to include a mass / outer diameter adjusting layer 22 that is made of a fiber reinforced resin and disposed at a position that does not include the vicinity of the large-diameter end portion 12 and the vicinity of the small-diameter end portion 11 in the longitudinal axis direction. In the example shown in the schematic diagram of FIG. 1, the mass / outer diameter adjusting layer 22 is disposed only in the intermediate portion in the direction along the longitudinal axis direction of the mandrel 1.
Further, the putter golf shaft according to the present invention, in the configuration provided with such a mass / outer diameter adjusting layer 22, has an inner diameter of the narrow end portion 11 of 3.0 mm or more and an outer diameter of 10.0 mm or less. In addition, it is preferable that the large-diameter end portion 12 is formed in a hollow shape having an inner diameter of 10.0 mm or more and an outer diameter of 16.0 mm or less.

Usually, a golf shaft for putter has an outer diameter of a small-diameter end portion at the tip of about 9.0 to 10.0 mm. This is based on the standard of the head to be inserted into the tip portion.
Moreover, the large diameter end part used as a grip part is 15.0-16.0 mm normally. This is determined from the viewpoint of ensuring ease of gripping by the player.

  On the other hand, for example, when a golf shaft for putter having a heavy mass of about 120 g is configured, when the upper limit of the outer diameter is determined as described above, it is common to secure the mass by reducing the inner diameter side. Is. Here, in the golf shaft for putters, there is a structure called an over hosel type in which a head is mounted by inserting a protrusion into the shaft. When such a type of head is used, the inner diameter of the shaft at the narrow end portion at the tip needs to be 3.0 to 6.0 mm. However, in a golf shaft for putter of about 120 g, it is difficult to adopt the above structure because a sufficient space for mounting the head inside cannot be secured.

  Therefore, in the golf shaft for putters according to the present invention, as described above, it is preferable that the mass / outer diameter adjusting layer 22 is not disposed on the small diameter end portion 11 side. In this case, it is not necessary to pay attention to the inner diameter on the large diameter end portion 12 side of the rear end serving as the gripping portion, and if it is about 120 g, a putter golf shaft can be manufactured without any problem. However, in this case, a balance point, the details of which will be described later, greatly moves toward the large diameter end portion 12 at the rear end. As described above, when the balance point is largely moved toward the large-diameter end portion 12, the swing feeling of the putter becomes light and there is a problem that the stability is lacking. Therefore, in the present invention, it is preferable that the mass / outer diameter adjusting layer 22 is not disposed on the large-diameter end portion 12 side, but is disposed only in the intermediate portion in the longitudinal axis direction of the golf shaft for putter. Thereby, as will be described later, it becomes possible to set a balance point at a position within 55% from the narrow-diameter end portion 11 in the longitudinal axis direction of the putter golf shaft.

(Other fiber reinforced resin layers)
In the golf shaft for putters according to the present invention, in addition to the bias layer, the mass / outer diameter adjustment layer, the rigidity adjustment layer, and the like, a fiber reinforced resin layer having other functions may be laminated. As such other fiber reinforced resin layers, the fiber reinforced resin as described above can be used without any limitation.

(Types of fiber reinforced resin)
Any resin can be used for the plurality of fiber reinforced resin layers as long as each condition is satisfied. For example, a carbon prepreg (Mitsubishi Rayon Co., Ltd. Can be used).

[Conversion mass W]
As described above, in the golf shaft for putter according to the present invention, the converted mass W (g) when the total length L is 915 mm satisfies the following formula {120 ≦ W ≦ 150} (formula (1)). is there.

  In the present invention, in order to correspond to the mass of the golf shaft for putter having any length, the converted mass when the total length L of the golf shaft for putter is 915 mm is adopted as the converted mass W. In addition, this full length is included in the range of the general full length of the golf shaft for putters.

  The converted mass W of the golf shaft for putter is preferably in the range of 120 to 160 g. If the converted mass W is less than 120 g, it is too light as a golf shaft for putter, so that the stability on play is lacking. On the other hand, when the converted mass W exceeds 160 g, the putter golf shaft becomes very heavy, so that the operability at the time of playing is lowered.

  Here, from the viewpoint of the above stability, the converted mass W of the putter golf shaft is more preferably 130 g or more, more preferably 140 g or more, and most preferably 150 g or more. On the other hand, from the viewpoint of the above operability, the converted mass W of the golf shaft for putter is more preferably 150 g or less, further preferably 140 g or less, and most preferably 130 g or less. Therefore, the converted mass W of the putter golf shaft is preferably set in the range of 120 to 160 g while considering the balance between stability and operability.

  When the total length of the putter golf shaft is not 915 mm, the converted mass W may be the mass when converted to 915 mm in a simple ratio.

[Rigidity F]
As described above, the putter golf shaft according to the present invention has a rigidity F (mm) satisfying the following expression {20 ≦ F <70} (expression (2)).

  The rigidity F of the golf shaft for putter can be measured, for example, by a method as shown in FIG. As shown in FIG. 2, in measuring the rigidity F, a position A of 760 mm from the small diameter end portion 11 of the putter golf shaft 10 is supported from the lower side, and further, from the position A to the large diameter end portion 12 side. A position B of 150 mm is supported from above. The displacement amount at the small-diameter end portion 11 when a load of 3.0 kgf is applied to a position C 10 mm from the small-diameter end portion 11 is defined as rigidity F. That is, the smaller the stiffness F, the harder the putter golf shaft, and the greater the stiffness F, the softer the putter golf shaft.

  The putter golf shaft preferably has a rigidity F in the range of 20 to 70 mm. When the rigidity F exceeds 70 mm, the golf shaft for putter is too low in rigidity and becomes soft, so that the difference from the conventional product is small and the superiority is lost. On the other hand, if the stiffness F is less than 20 mm, the stiffness is too high and it becomes hard, no flexure is obtained, and it is difficult for the player to obtain a good feeling.

  Here, from the viewpoint of ensuring a certain rigidity (hardness) as the golf shaft for putter, the rigidity F is more preferably 60 mm or less, further preferably 50 mm or less, particularly preferably 40 mm or less, and most preferably 30 mm or less. On the other hand, from the viewpoint of the above feeling, the rigidity F is more preferably 30 mm or more, further preferably 40 mm or more, particularly preferably 50 mm or more, and most preferably 60 mm or more. Therefore, it is preferable to set the rigidity F of the golf shaft for putter in the range of 20 to 70 mm while considering the balance between rigidity (hardness) and feeling.

[Balance point]
In the golf shaft for putters according to the present invention, the balance point in the longitudinal axis direction is preferably a position within 55% from the narrow end portion 11. When the balance point is within 55% of the small diameter end portion 11, excellent stability as a putter golf shaft can be obtained. When the balance point is out of the above range, that is, when the balance point is at a position closer to the large-diameter end portion 12, as described above, the putter swing feeling becomes light and is not stable.

  Here, the “balance point” described in the present invention refers to a support point at which the putter golf shaft can maintain a horizontal state when one point in the longitudinal axis direction of the putter golf shaft is supported. .

The balance point is preferably at a position within 54% from the narrow diameter end portion 11, and more preferably at a position within 53%.
The balance point of the putter golf shaft according to the present invention can be optimized by adjusting the position and size of the mass / outer diameter adjusting layer 22 in the longitudinal axis direction of the putter golf shaft as described above.

<Effect>
As described above, according to the golf shaft for putters according to the present invention, by optimizing the range of the converted mass W based on the total length L and the rigidity F, the hitting direction is set to the left as viewed from the right-handed player. It will be easier to launch. As a result, when a player who has a heel that easily removes the hit ball on the right side performs the putting, the hitting direction is corrected in a roughly straight direction. Therefore, it is particularly suitable for a player who can easily remove the hit ball on the right side.

<Others>
The embodiments of the present invention have been described in detail with reference to the drawings. However, the configurations described in the present embodiments and combinations thereof are examples, and the configurations of the configurations are within the scope not departing from the spirit of the present invention. Additions, omissions, substitutions, and other changes are possible. Further, the present invention is not limited by the present embodiment, but is limited only by the scope of the claims.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, the scope of the present invention is not limited to these Examples.

<Example 1>
[Preparation of golf shaft for putter]
In Example 1, first, a prepreg made of a fiber reinforced resin (carbon prepreg: manufactured by Mitsubishi Rayon Co., Ltd.) as shown in Table 1 below was prepared.
As the mandrel, the outer diameter of the tip is 3.3 mm, there is no taper from the tip to the position of 150 mm in the longitudinal axis direction, and the diameter gradually increases with a taper of 9/1000 from the position of 150 mm to the rear end. An outer diameter of 10.36 mm was prepared.

  As shown in FIG. 1, a bias layer 21 (prepreg C shown in Table 1: 9 ply (9 stacked layers)) as an innermost layer on the outer peripheral surface of the mandrel 1, and a mass wound around only the intermediate portion on the outer side thereof The outer diameter adjusting layer 22 (prepreg C shown in Table 1: 2ply) and the stiffness adjusting layer 24 (prepreg M: 4ply shown in Table 1; prepreg C: 5ply) are arranged on the outside and wound sequentially. .

Next, after each prepreg is heat-cured, the mandrel 1 is pulled out, the fine diameter end portion 11 is cut by 10 mm, and the large diameter end portion 12 side is cut by 10 mm. The total length L of the shaft was 915 mm.
According to the above conditions and procedures, a golf shaft for putter of Example 1 having specifications as shown in Table 2 below was obtained.
In the obtained golf shaft for putter of Example 1, the outer diameter of the small diameter end portion serving as the front end was 9.1 mm, and the outer diameter of the large diameter end portion serving as the rear end was 15.5 mm.

  In all the examples and comparative examples described below, all the dimensions in the longitudinal axis direction of the putter golf shaft are based on the configuration after cutting.

[Evaluation of golf shaft for putter]
Next, an evaluation test using a sample of a golf shaft for putter, which was performed in this example, will be described.

(Measurement of converted mass W when the total length L is 915 mm)
In the present example, since the total length L of the golf shaft for putter is made to be 915 mm, including the examples and comparative examples described later, the mass of each sample is simply measured for the converted mass W. The results are shown in Table 2 below.

(Measurement of stiffness F)
As shown in FIG. 2, a position A of 760 mm from the small diameter end portion 11 of the golf shaft for putter is supported from the lower side, and a position B of 150 mm is supported from the upper side from the position A to the large diameter end portion 12 side. In this state, when a load of 3.0 kgf was applied to a position C 10 mm from the small diameter end portion 11, the amount of displacement at the small diameter end portion 11 was measured, and this was shown as the rigidity F in Table 2 below.

(Evaluation of putting by subject)
Below, the evaluation of the putting which used the sample of the golf shaft for putters implemented in the present Example is demonstrated.
In this evaluation test, first, a test shot experiment (5 balls each) by 10 subjects (right-handed) was performed using a sample of a putter golf shaft having a putter head attached to a small-diameter end. This experiment was carried out indoors, with the condition that a cup 7 m ahead was applied and the result was shown in Table 1 below as “left-right displacement (mm)”.

  In this evaluation test, the left and right reaching points of a total of five balls by the putter golf shaft produced in Comparative Example 1 described later are set as “0 (mm) positions” for each subject, and this position Table 1 below shows the average values of 10 subjects after measuring the amount of deviation from the left and right as “left / right deviation (mm)”. The value of “left / right deviation (mm)” in Table 1 below indicates a distance shifted to the left when the value is negative, and a distance shifted to the right when the value is positive.

(Balance point measurement)
First, when the obtained putter golf shaft is passed through a rubber band and supported at one point in the longitudinal axis direction, a support point at which the putter golf shaft can maintain a horizontal state is determined. The distance between them was measured, and the balance point was defined as the ratio to the total length. The results are shown in Table 2 below.

Table 1 below shows a list of prepregs made of fiber reinforced resin used in this example (all manufactured by Mitsubishi Rayon Co., Ltd.).
Table 2 below shows a list of specifications and evaluation results of each sample of the putter golf shaft produced in this example. In Table 2 below, the total length L, the converted mass W, the rigidity F, and the balance point are n = 1, and the left / right deviation is an average value of n = 10.

<Example 2>
In Example 2, a golf shaft for putter was produced in the same manner as in Example 1 except that the prepreg used in the rigidity adjusting layer 24 of Example 1 was changed to the following as shown in Table 1. Evaluation was performed in the same manner.
・ Prepreg M: 5ply
・ Prepreg C: 4ply

<Example 3>
In Example 3, a golf shaft for putter was produced in the same manner as in Example 1 except that the prepreg used in the rigidity adjusting layer 24 of Example 1 was changed to the following as shown in Table 1. Evaluation was performed in the same manner.
・ Prepreg M: 6ply
・ Prepreg C: 3ply

<Example 4>
In Example 4, a golf shaft for putter was produced in the same manner as in Example 1 except that the prepreg used in the rigidity adjusting layer 24 of Example 1 was changed to the following as shown in Table 1. Evaluation was performed in the same manner.
・ Prepreg M: 7ply
・ Prepreg C: 2ply

<Example 5>
In Example 5, a golf shaft for putter was produced in the same manner as in Example 1 except that the prepreg used in the stiffness adjusting layer 24 of Example 1 was changed to the following as shown in Table 1. Evaluation was performed in the same manner.
・ Prepreg M: 8ply
・ Prepreg C: 1ply

<Example 6>
In Example 6, except that the prepreg used in the rigidity adjustment layer 24 of Example 1 was changed to the following as shown in Table 1, a golf shaft for putter was produced in the same manner as in Example 1, Evaluation was performed in the same manner.
・ Prepreg M: 9ply

<Comparative Examples 1-11>
In Comparative Examples 1 to 11, the prepreg used for the stiffness adjusting layer or the bias layer is appropriately selected from the prepregs described in Table 1 so that the converted mass W and the stiffness F are the values shown in Table 2. Except for the points that were selected and adjusted, a golf shaft for putter was produced in the same manner as in Example 1 and evaluated in the same manner.

<Evaluation results>
As shown in Table 2, golf balls for putters of Examples 1 to 6 in which both the converted mass W (g) and the rigidity F (mm) when the total length L is 915 mm are within the range defined by the present invention. The left-right misalignment was in the range of −6 to −17 mm, and the result was shifted from the comparative example 1 in the range of 6 to 17 mm in the left direction.

  From the results of Examples 1 to 6, the value of rigidity F is large and the soft putter golf shaft has a tendency that the hit ball tends to shift to the right side, whereas the value of rigidity F is small and the hard putter golf shaft is It can be seen that the hit ball tends to shift to the left. That is, a player who has a heel that easily hits the ball on the right side can increase the cup-in rate at the time of putting by using the golf shaft for putters according to the present invention, which has a small value of rigidity F and is hard. It is clear that

On the other hand, Comparative Examples 1 to 11 are examples in which at least one of the converted mass W (g) or the rigidity F (mm) is outside the range defined in the present invention.
As described above, Comparative Example 1 is an example set as a reference for evaluation of putting by a subject, and is an example in which the rigidity F exceeds the upper limit defined in the present invention.
Comparative Example 2 is an example in which the converted mass W is less than the lower limit specified in the present invention and the rigidity F exceeds the upper limit specified in the present invention. In Comparative Example 2, the left-right deviation evaluated under the above conditions was −3 mm, and although the hit ball was slightly shifted in the left direction compared to Comparative Example 1, the left side in Examples 1 to 7 However, it is difficult to say that it is effective for a player who has a habit that the hit ball is likely to come off on the right side.

The comparative example 3 is an example in which both the rigidity F and the converted mass W exceed the upper limit defined in the present invention, but the comparative example 3 has a result that the right / left misalignment is greatly shifted to the left side at −23 mm. This is presumably because the converted mass W was too large and the operability of the putter golf shaft was lowered.
Comparative Example 4 is an example in which the rigidity F greatly exceeds the upper limit defined in the present invention, but this Comparative Example 4 results in the right / left misalignment being +22 mm and a large deviation to the right side, and the hit ball tends to come off to the right side. It was hard to say that it was effective for the player who had it.

Comparative Example 5 is an example in which the rigidity F exceeds the upper limit defined in the present invention. In the average value of 10 persons, although the right / left deviation was shifted to -13 mm to the left, the variation was very large. The average value was not reliable. This is thought to be because the balance point was 56% from the narrow end and the swing became unstable. In addition, the subject felt that it was difficult to swing.
The comparative example 6 is also an example in which the rigidity F exceeds the upper limit defined in the present invention. However, the comparative example 6 results in the right and left misalignment deviating to +3 mm and can solve the problem of the present invention as described above. It was not a thing.
The comparative example 7 is also an example in which the rigidity F greatly exceeds the upper limit defined in the present invention. However, the comparative example 7 results in the right / left misalignment being shifted to the right side by +2 mm. It wasn't possible.

The comparative example 8 is also an example in which the rigidity F greatly exceeds the upper limit defined in the present invention. However, in this comparative example 8, the right / left misalignment is slightly shifted to the left side by -1 mm, and the hit ball deviates to the right side. It was difficult to say that it was effective for players with easy habits.
The comparative example 9 is also an example in which the rigidity F greatly exceeds the upper limit defined in the present invention. However, this comparative example 9 results in the right / left misalignment shifting to +8 mm to the right, and the problem of the present invention is solved as described above. It wasn't possible.

Comparative Example 10 is an example in which both the rigidity F and the converted mass W exceed the upper limit defined in the present invention, but this Comparative Example 10 results in the right / left misalignment being +5 mm and to the right. The problem of the invention could not be solved.
The comparative example 11 is an example in which the rigidity F is less than the lower limit specified in the present invention, but the comparative example 11 has a result that the right / left misalignment is greatly shifted to the left side at −20 mm. Although the result was intended in advance, in Comparative Example 11, since the value of the rigidity F is small, the putter golf shaft becomes very hard and no bending is obtained, and the subject has a good feel. Since it was difficult to obtain a ring, it was set as a comparative example.

  From the results of the embodiments described above, it is clear that the golf ball for putter according to the present invention can be used to correct a player's putting wrinkle and launch a ball.

  In the golf shaft for putter of the present invention, when a player having a heel that easily removes the hit ball on the right side performs putting, the hitting direction is corrected in a roughly straight direction. This is particularly suitable for a player who easily removes the hit ball on the right side, and is extremely useful.

1 ... Mandrel,
2 ... Fiber reinforced resin layer,
21 ... Bias layer,
22 ... mass / outer diameter adjustment layer,
24. Rigidity adjusting layer,
10: Golf shaft for putter,
11 ... small diameter end,
12: Large diameter end.

Claims (4)

A golf shaft for putter comprising a plurality of fiber reinforced resin layers,
The converted mass of the golf shaft for putter when the total length L is 915 mm is W (g),
Support the position A of 760 mm from the narrow diameter end side of the golf shaft for putter from below,
Furthermore, the position B of 150 mm is supported from the upper side from the position A to the large diameter end side,
When applying a load of 3.0 kgf to a position 10 mm from the small diameter end side and measuring the displacement amount on the small diameter end side, when the displacement amount by the cantilever bending test is set to rigidity F (mm),
A golf shaft for putter that satisfies the following formulas (1) and (2).
120 ≦ W ≦ 160 (1)
20 ≦ F <70 (2)   The golf shaft for putters according to claim 1, wherein a balance point in a longitudinal axis direction of the golf shaft for putters is a position within 55% from the narrow end portion.   The fiber reinforced resin layer includes a stiffness adjusting layer made of a fiber reinforced resin in which the orientation direction of the reinforcing fiber with respect to the longitudinal axis direction of the golf shaft for putter is −10 ° to + 10 °, and the stiffness adjusting layer 3. The golf shaft for putter according to claim 1, wherein 1/3 or more of the total mass is made of a fiber reinforced resin having a tensile elastic modulus of the reinforcing fiber of 200 GPa to 350 GPa. Furthermore, the fiber reinforced resin layer is made of a fiber reinforced resin in which the orientation direction of the reinforced fiber with respect to the longitudinal axis direction of the golf shaft for putter is 0 ° to ± 75 ° on the inner layer side of the rigidity adjusting layer, And a mass / outer diameter adjusting layer disposed in a position not including the vicinity of the large-diameter end and the vicinity of the small-diameter end in the longitudinal axis direction,
The inner diameter at the small diameter end is 3.0 mm or more and the outer diameter is 10.0 mm or less, and the inner diameter at the large diameter end is 10.0 mm or more and the outer diameter is 16.0 mm or less. The golf shaft for putters according to claim 3, which is formed as a certain hollow shape.

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