JP6853210B2 - Golf club set - Google Patents

Description

The present invention relates to a golf club set in which a plurality of golf clubs having different loft angles are set, and the present invention relates to a golf club set in which the shaft of each golf club constituting the golf club set is formed of a fiber reinforced resin (FRP).

Conventionally, most golf club shafts are made of fiber reinforced plastic (hereinafter referred to as FRP), and most wood-type golf clubs are made of FRP. The shaft made of FRP has an advantage of being able to reduce the weight, and as is known, a sheet member (prepreg sheet) in which reinforcing fibers are impregnated with synthetic resin for a mandrel in which a taper is formed so that the tip side is reduced in diameter. It is molded by winding it, heating it, and decentering it.

As the prepreg sheet wound around the mandrel, various forms such as the type of reinforcing fiber, its orientation, the amount of resin impregnated, etc. are used, and since the head is mounted on the tip side of the shaft. , A prepreg sheet for reinforcement is wound for the purpose of ensuring strength. Generally, such a prepreg sheet for reinforcement is wound within a range of about 200 mm from the tip of the mandrel, but the tip region swells by winding the prepreg sheet for reinforcement. For example, as disclosed in Patent Document 1, a steep taper portion (step portion) is formed on the tip end side of the mandrel around which the prepreg sheet is wound.

As the reinforcing prepreg sheet described above, for example, as disclosed in Patent Document 2, a reinforcing fiber oriented in the axial length direction is used so as to be easily wound. Further, for example, Patent Document 3 discloses a configuration in which a metal fiber prepreg sheet is arranged on the tip side on which the head is mounted. Since such a metal fiber prepreg seat has a heavy specific gravity, it is possible to lower the center of gravity of the shaft, and it is possible to contribute to lowering the center of gravity of the golf club as a whole.

JP 2001-190722 JP 2015-231426 JP-A-2002-035185

As disclosed in Patent Document 3 described above, when molding a shaft, the center of gravity of the shaft itself can be lowered by winding a metal fiber prepreg sheet around the tip side. In this case, as disclosed in Patent Document 1, such a metal fiber prepreg sheet is wound so as to fill a step portion formed at the tip of the mandrel, and if necessary, a patent is provided. It is also conceivable to wind a prepreg sheet in which the reinforcing fibers are oriented in the axial length direction as disclosed in Document 2 together.

By the way, it is possible to lower the center of gravity of a golf club by winding a metal fiber prepreg sheet around the tip side, but when considering the golf club set, all the golf clubs in the set are effectively lowered. It cannot be centered. That is, in consideration of iron clubs, low-count clubs are required to improve the head speed and extend the flight distance, so it is desirable that the shaft is lightweight, and it is preferable to increase the weight. I can't say. On the other hand, high-count clubs are required to have directionality and stable trajectory rather than flight distance, so it is considered that the shaft may be shorter and the weight may be heavier (thus, the higher the number of clubs, the heavier the weight). The remaining capacity will increase).

As mentioned above, a configuration in which a metal fiber prepreg sheet is simply wound around the tip of the shaft does not provide sufficient performance from the viewpoint of a golf club set with a low center of gravity of the shaft. No, there is room for improvement. In particular, when the reinforcing prepreg sheet in which the reinforcing fibers are oriented in the axial length direction is wound together with the metal fiber prepreg sheet, it is difficult to adjust the weight by the metal fiber prepreg sheet in order to increase the shaft weight. There is a problem that a difference in rigidity occurs in the circumferential direction, and further, it becomes difficult to adjust the outer diameter when filling the step portion formed at the tip of the mandrel).

The present invention has been made by paying attention to the above-mentioned problems, and is a golf club set constructed by a golf club equipped with an FRP shaft and effectively achieving a low center of gravity in all count golf clubs. The purpose is to provide.

In order to achieve the above object, the golf club set according to the present invention is a set of a plurality of golf clubs in which a shaft made of fiber reinforced resin is attached to a head, and the tip of the shaft of each golf club for constructing the set. It is characterized in that the heavy body is arranged within the range of 200 mm from the weight, and the weight is flown between the counts so that the heavy body of the shaft having a high count becomes heavier.

By arranging a heavy body on the tip end side of the shaft, it is possible to lower the center of gravity of the golf club. However, if the position of the heavy body with respect to the shaft is high, the center of gravity cannot be effectively lowered due to the balance with the head, which is a heavy object. Therefore, the heavy body is 200 mm from the tip of the shaft through all golf clubs. It is arranged at the position of. Here, considering the golf club set, the required characteristics differ depending on the count, and in a low count club (the loft angle of the head is small), it is required to improve the head speed and extend the flight distance. Therefore, it is desirable that the shaft is lightweight, and high-count clubs (the loft angle of the head is small) require directionality and stable trajectory rather than flight distance, so the shaft is short. It is preferable that the weight is also heavy.

Therefore, when arranging the heavy body at a position 200 mm from the tip on the shaft of each club of the golf club set, the heavy body becomes heavier as the number shifts to a higher number, so that the required characteristics for each of the above-mentioned counts are obtained. A golf club set that can be satisfied and has a lower center of gravity than a golf club of the same count as a conventional golf club set, and therefore a high trajectory can be obtained through all counts is constructed.

According to the present invention, it is possible to obtain a golf club set constructed by a golf club equipped with an FRP shaft and effectively achieving a low center of gravity in all golf clubs.

The figure which shows one Embodiment of the iron club included in the golf club set which concerns on this invention. It is a figure which shows the arrangement example of the prepreg sheet which forms the shaft of the iron club shown in FIG.

Hereinafter, embodiments of the golf club set according to the present invention will be described.
The golf club set according to the present invention is a wood-type golf club set (including a utility club) or an iron-type golf club set, and a plurality of golf clubs having different head loft angles (different counts). Is intended for those that are implemented (manufactured and sold) as a set. Each club that constructs the set is equipped with a shaft made of FRP, and as described in detail below, a heavy body is arranged at the tip of the shaft of each club (within a range of 200 mm from the tip of the shaft), and the weight thereof. The body is weight-flowing so that it becomes heavier as the number increases.
In the present embodiment, an iron club set including a plurality of iron clubs 1 as shown in FIG. 1 will be illustrated and described.

The iron club 1 includes a head (iron head) 5 mounted on the tip end side of the FRP shaft 10 and a grip 12 mounted on the base end side of the shaft 10.
The head 5 has a hosel 5a into which the shaft 10 is inserted to fix the tip region, and a plate-shaped face portion 5b on which a ball is hit. The total length L of the shaft 10 differs depending on the count (the loft angle differs for each count), and the adhesion range L1 between the outer surface of the shaft 10 and the inner surface of the fitting hole of the hosel 5a is determined by the count or the type of golf club. Although it depends, it is generally about 25 mm to 40 mm. The range of 200 mm from the tip of the shaft is the range of L2 in the figure.

The shaft 10 is made of FRP, and as shown in FIG. 2, a plurality of prepreg sheets in which reinforcing fibers are impregnated with synthetic resin are wound around a mandrel (core metal) 100, and the prepreg sheets are thermally cured and decentered. It is formed by doing. In this case, the tip region of the shaft 10 is for reinforcement because the diameter is reduced by a taper, a head is attached (a heavy object is added), an impact is received at the time of hitting a ball, and the like. A prepreg sheet (hereinafter, also referred to as a reinforcing sheet) 21, 22, 23 is wound around. Further, after winding the reinforcing sheet, 31 to 34 prepreg sheets (hereinafter, also referred to as main body sheets) for the main body forming the shaft main body (wound over the entire length of the shaft) are wound.

As described above, a heavy body is arranged in a range of 200 mm from the tip of the shaft, and in the present embodiment, the reinforcing sheet wound around the shafts of all the clubs in the set is used. A heavy body is formed by using a high specific gravity prepreg sheet containing metal powder (in the present embodiment, the reinforcing sheet 21 becomes a high specific gravity prepreg sheet). That is, it is possible to easily form a shaft having a low center of gravity simply by changing the reinforcing sheet wound during conventional shaft forming to a high specific gravity prepreg sheet. In this case, since the portion is thickened by winding the reinforcing sheets 21, 22, 23, a steep taper 100a is formed on the tip side of the mandrel 100, and the tip side thereof is further on the tip side. It has a taper 100b that decreases in diameter toward the end. Therefore, the reinforcing sheet is wound so as to fill the holes in the step portion, the surface of the reinforcing sheet is smoothed, and the main body sheet is wound.

Here, the reason why the heavy body is within the range of 200 mm from the tip of the shaft will be described.
When considering the shaft alone, the balance point (position of the center of gravity) differs depending on the count, and the shaft of a normal golf club set is within the range of 44% to 52% from the tip position (high count). The balance point is designed to shift to the hand side). In such a configuration, if a heavy body is arranged on the tip side of the balance point of the shaft in order to lower the center of gravity, the center of gravity of the shaft becomes the tip side (the balance point moves to the tip side). However, if the distance from the balance point to the heavy body is short or the range occupied by the heavy body is wide, the position of the heavy body arranged on the shaft is too high when the head is mounted at the tip position. As a club, the center of gravity will be raised. Therefore, in the present invention, by specifying the arrangement position of the heavy body within a certain value range (within a range of 200 mm) from the tip position of the shaft, the center of gravity can be effectively lowered as a golf club. (Placement of a heavy body at a position exceeding 200 mm tends to prevent the center of gravity from being lowered as a club).

In the above configuration, the reinforcing sheet wound around the tip end side of the mandrel 100 may be configured as long as it can fill the step portion (region from the steep taper 100a to the taper 100b) and smooth it. , The above-mentioned high specific gravity prepreg sheet 21 (range of 195 mm from the tip), glass fiber prepreg sheet 22 (range of 295 mm from the tip), and carbon fiber prepreg sheet 23 (range of 295 mm from the tip) in this order from the inner layer side. Is wound around.

The high specific gravity prepreg sheet 21 constituting the heavy body may have a structure having a heavier specific gravity than other reinforcing sheets. For example, a high specific gravity metal material (for example, tungsten, iron, copper, stainless alloy, etc.) may be used. (Powdered specific gravity material) is evenly dispersed in a synthetic resin to form a matrix material, which is preferably impregnated with a sheet in which glass fibers are aligned in the axial length direction. Further, the glass fiber prepreg sheet 22 has a function of adjusting the outer diameter of the shaft, and since the elastic modulus of the glass fiber is low, there is no difference in rigidity in the circumferential direction even if the number of turns is odd. Have. Further, the carbon fiber prepreg sheet 23 has a function of increasing the rigidity (increasing the strength) and adjusting the outer diameter of the shaft. As the reinforcing sheets 21 to 23 described above, it is preferable to use one in which the reinforcing fibers are aligned in the axial length direction, whereby the winding operation can be facilitated.

As described above, in the present invention, the weight of the heavier body (composed of the high specific gravity prepreg seat 21 in the present embodiment) is increased as the count becomes higher, and the weight is effectively flowed to each golf club. It is characterized by lowering the center of gravity and obtaining a high trajectory flight ball. Therefore, as shown in the figure, the high specific gravity prepreg sheet 21 is cut into a triangular shape corresponding to the tip region L1 of the shaft, and the higher the count, the larger the number of turns at the tip position. Seats are used (the higher the club, the wider the D1).

That is, by cutting the high specific gravity prepreg sheet 21 into a triangular shape and winding it, it is possible to obtain a continuous specific gravity difference without generating an extreme difference in specific gravity in the axial direction, and the count becomes higher. By increasing the number of windings at the tip position according to the above, the position of the center of gravity can be shifted to the tip side (the weight per unit area shifts to the tip side) even though the material is the same. It is possible to realize a low center of gravity.

Further, in the present embodiment, the glass fiber prepreg sheet 22 is wound around the outer layer side of the high specific gravity prepreg sheet 21. The glass fiber prepreg sheet 22 has a width of D2 on the front end side, gradually increases the number of turns toward the rear end side (the position of 195 mm from the front end is the maximum width), and from there toward the rear end. It is cut so that the number of turns becomes 0 at a position of 100 mm (a position of 295 mm from the tip and a tip portion of the shaft). In this case, with respect to the glass fiber prepreg sheet 22, the higher the count, the smaller the number of windings at the tip position (the width of D2 is reduced).

Since the glass fiber prepreg sheet 22 is lighter in weight per unit area than the high specific gravity prepreg sheet 21, the glass fiber prepreg sheet 22 is increased in the number of windings of the high specific gravity prepreg sheet 21 according to the higher count. Even if the number of windings is reduced, the weight on the tip side can be effectively increased (weight flow), and the combined wall thickness of both can be maintained at a substantially constant value (the tip of the mandrel 100). It is possible to adjust the outer diameter so that the step on the side can be filled with holes).

Further, since the glass fibers used for the reinforcing sheets 21 and 22 have a low elastic modulus, even if these sheets are wound with an odd number of plies, a large change in rigidity does not occur in the circumferential direction. Therefore, the rigidity balance in the circumferential direction is not lowered, and the weight flow between counts can be finely set while adjusting the outer diameter.

In the present embodiment, a reinforcing carbon fiber prepreg sheet 23 in which carbon fibers are impregnated with a synthetic resin is wound around the outside of the glass fiber prepreg sheet 22. The carbon fiber prepreg sheet 23 has substantially the same shape as the glass fiber prepreg sheet 22, and the number of windings is an integer (not an odd ply) at least in the region where the high specific gravity prepreg sheet 21 is wound. It is cut so that the rigidity does not change in the circumferential direction. Specifically, it is cut so that it is 4-ply at the tip position and 4-ply at the same position as the rear end of the high specific gravity prepreg sheet 21 (the winding start and winding end are slightly overlapped or separated due to a cutting error. Including configurations that are not strictly matched, such as).
By winding the carbon fiber prepreg sheet 23 with such an integer ply number, it is possible to improve the strength in the tip region of the shaft without causing a change in rigidity in the circumferential direction.

When the above-mentioned reinforcing sheets 21 to 23 are wound around the mandrel 100, the step at the tip is filled with holes and the surface is made substantially flush with the mandrel 100. In this state, the main body prepreg sheets 31 to 34 are wound around the surface. A plurality of main body prepreg sheets are wound to form the entire length of the shaft (form the main body layer), and various configurations are wound in consideration of the characteristics of the golf club, the weight balance, and the like. For example, a first oblique sheet in which the reinforcing fibers are oriented in the + 45 ° direction with respect to the axial length direction and a second oblique sheet in which the reinforcing fibers are oriented in the −45 ° direction with respect to the axial length direction are superposed. It is possible to wind the main body prepreg sheet 31, the main body prepreg sheets 32 and 34 in which the reinforcing fibers are aligned in the axial length direction, the main body prepreg sheet 33 in which the reinforcing fibers are aligned in the circumferential direction, and the like. The shaft body is formed by the prepreg sheet.

Among the above-mentioned multiple wound main body sheets, the one in which the reinforcing fibers are aligned in the axial length direction contributes to the improvement of the bending rigidity, and the one in which the reinforcing fibers are oriented in the cross direction is the torsional rigidity. Contributes to the improvement of. In this case, it is the reinforcing fibers oriented at ± 45 ° that most effectively contribute to the improvement of the torsional rigidity, but the angle is not limited. Further, those in which the reinforcing fibers are aligned in the circumferential direction contribute to the improvement of the crushing rigidity.

Next, an example of the weight flow between the shafts generated by using the reinforcing sheets 21 and 22 described above will be described.
In the present invention, the weight flow means that the weight on the tip end side of the shaft is increased as the golf club in the set shifts to a higher count, and in the present embodiment, the weight is reinforced as the count is higher. Optimal while adjusting the outer diameter between counts by increasing the number of windings at the tip position of the sheet (high specific gravity sheet) 21 and decreasing the number of windings at the tip position of the reinforcing sheet (glass sheet) 22. We are trying to realize a good weight flow.

Table 1 below shows an example of the shaft specifications and weight flow for each iron in the iron club set in which the irons from the 4th iron to the approach wedge (AW) are set.
In this embodiment, the number of turns of the high specific gravity sheet 21 and the glass sheet 22 is changed for each count, and the center of gravity can be appropriately lowered for each count while adjusting the outer diameter.

このような構成では、番手間で連続的に重心位置が変化した重量フローとなる（極端な重心位置の変化がない）ため、各番手で振り心地が良くなり、従来のセットと比較しても全てのゴルフクラブが適切に低重心化され、各番手のクラブで高弾道の飛球を得ることが可能となる。
なお、このような重量フローは、一例を示したに過ぎず、各シートの巻回数については、適宜、変形することが可能である。

In such a configuration, the weight flow is such that the position of the center of gravity changes continuously between the counts (there is no extreme change in the position of the center of gravity). All golf clubs have an appropriately lowered center of gravity, and it is possible to obtain a high trajectory fly ball at each club.
It should be noted that such a weight flow is only an example, and the number of turns of each sheet can be appropriately deformed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be variously modified.
In the present invention, in an iron type golf club or a wood type golf club set, a heavy body is arranged in any region within a range of 200 mm from the tip of the shaft of each count, and the weight becomes heavier as the count becomes higher. It suffices if such a weight flow occurs, and the structure of the heavy body is not limited to the high specific gravity sheet containing the metal powder as described above. For example, heavy bodies having different specific gravities may be incorporated at the tip positions of the shafts of each count, or a prepreg sheet using metal fibers as reinforcing fibers may be used as the reinforcing sheet. Further, when the reinforcing sheet is a heavy body, its shape can be appropriately deformed.

Further, the weight flow is such that the high-count shaft is relatively heavier than the low-count shaft, and the weight is continuously changed throughout all the counts as in the present embodiment (see Table 1). ), The weight may be changed intermittently.

1 Golf club 5 Head 10 FRP shaft 21 High specific gravity prepreg seat (reinforcing seat)
22 Glass fiber prepreg sheet (reinforcing sheet)
23 Carbon fiber prepreg sheet (reinforcing sheet)
31-34 Main body prepreg sheet 100 mandrel

Claims (5)

In a golf club set consisting of multiple golf clubs with fiber reinforced plastic shafts attached to the head.
A heavy body is arranged within a range of 200 mm from the tip of the shaft of each golf club that constructs the set, and the weight is flowed between the counts so that the heavy body of the high-count shaft becomes heavier .
The heavy body disposed on the shaft of each golf club is a high specific gravity prepreg sheet that is wound around the tip side of the mandrel during shaft molding and impregnated with a synthetic resin containing metal powder.
The high specific gravity prepreg sheet has a triangular shape in which glass fibers are aligned in the axial length direction, and is characterized in that the higher the number of shafts, the greater the number of turns at the tip position. Club set. A feature is that a reinforcing glass fiber prepreg sheet in which glass fibers are impregnated with synthetic resin and a reinforcing carbon fiber prepreg sheet in which carbon fibers are impregnated with synthetic resin are wound around the tip of the shaft of each golf club. The golf club set according to claim 1. In a golf club set consisting of multiple golf clubs with fiber reinforced plastic shafts attached to the head.
A heavy body is arranged within a range of 200 mm from the tip of the shaft of each golf club that constructs the set, and the weight is flowed between the counts so that the heavy body of the high-count shaft becomes heavier.
The heavy body disposed on the shaft of each golf club is a high specific gravity prepreg sheet that is wound around the tip side of the mandrel during shaft molding and impregnated with a synthetic resin containing metal powder.
A feature is that a reinforcing glass fiber prepreg sheet in which glass fibers are impregnated with synthetic resin and a reinforcing carbon fiber prepreg sheet in which carbon fibers are impregnated with synthetic resin are wound around the tip of the shaft of each golf club. Golf club set. 2. The glass fiber prepreg sheet is characterized in that the glass fibers are aligned in the axial length direction and are cut so that the higher the number of shafts, the smaller the number of windings at the tip position. The golf club set described in 3. In the carbon fiber prepreg sheet, the carbon fibers are aligned in the axial length direction, and the carbon fibers are aligned in the axial length direction.
The golf club set according to any one of claims 2 to 4, wherein the golf club set is cut so as to have an integer number of turns at least within a range of 200 mm from the tip of the shaft.

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