KR20160108150A - Golf club shaft - Google Patents

Abstract

Provided is a shaft for a golf club which constitutes a golf club making a ball to be easily controlled. A ballast material is installed to a shaft (10) used for a golf club (1). The ballast material is installed in a region near an open end of a hosel installed to a head (HD), wherein a shaft (ST) is attached to the hosel. The region is the place in which a speed of the head (HD) moving in a direction (X direction) starts to decrease, within 0.1-0.3 ms from the time when the head (HD) hits a ball (BD).

Description

Golf club shaft {GOLF CLUB SHAFT}

The present invention relates to a shaft for a golf club, and more particularly to a shaft for a golf club which facilitates control of the ball.

The present application claims priority based on Japanese Patent Application No. 2015-44336, filed on March 6, 2015, the contents of which are incorporated herein by reference.

Several improvements have been made to the golf club to get a better score in the game of golf. For example, in Patent Document 1, when the ball is hit with a head, the rubbing point of the golf ball is lowered due to a change in the direction of the shaft when the ball is hit by a head, A golf club is disclosed in which a change in the direction of the face can be prevented and distance can be ensured by focusing on the fact that the distance is decreased. Specifically, in a golf club in which a shaft is inserted and fixed with respect to the base portion of the head, the flexural rigidity of a shaft within a predetermined range in the grip direction from the inside of the base portion is reinforced, and a weight is installed near the end portion of the reinforced region Thereby preventing a change in the face direction.

Japanese Patent Application Laid-Open No. 09-262325

However, in golf, control of the ball is equally important as increasing the distance, and it is difficult to obtain a good score simply by extending the distance of the ball. In the golf club disclosed in Patent Document 1, since the reinforcing region extending in the grip direction from the inside of the base portion of the shaft is formed, there is a fear that the back spin of the ball is weakened. Normally, when the backspin of the ball is weakened, the ball is not stabilized and the ball becomes difficult to control. In addition, in the golf club disclosed in Patent Document 1, since the reinforcing region is formed, the weight of the entire shaft increases, making it difficult for the golf club itself to be wielded, and stress is concentrated on the end portion of the reinforcing region.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shaft for a golf club which can constitute a golf club in which the ball is more easily controlled.

In order to attain at least part of the above object, the shaft for a golf club according to the first invention is a shaft for a golf club to which the head is attached by a hosel provided on the head, and a weight is provided in a region where the velocity in the traveling direction of the head in the region near the opening end of the hosel on the shaft starts to decrease in a time of ms to 0.3 ms.

The shaft for a golf club according to the second invention is a shaft for a golf club to which the head is attached by a hosel provided on the head. The shaft of the golf club is attached to an end of the hosel on the shaft during the impact when the head hits the ball. And the weight is provided in a region where the absolute value of the ratio of the minimum value of the acceleration during the impact to the maximum value is 16 or more.

In the golf club shaft according to the first invention or the second invention, the weight is attached to a position where the ball and the head are in deceleration while being in contact with each other. The area from the head to the attachment position of the heavy object acts as an integral part of the ball at impact. The area of the ball acting on the ball is generally centered so that the backspin of the ball is enhanced by the gear effect. As a result, the backspin of the ball (hit) after the strike is enhanced, so that the ball can be controlled more easily.

The weight of the weight may be 30 g or less. By making the weight of the heavy material 30 g or less, it is possible to suppress the increase of the weight of the shaft itself, thereby suppressing the difficulty in waving the golf club.

Further, the present invention can be realized by various embodiments. For example, the present invention may be realized in various embodiments such as a shaft for a golf club, a golf club using the shaft, a method for adjusting an existing golf club shaft or a golf club, and a member used for the adjusting method.

1A is a view showing a golf club using a shaft according to a first embodiment of the present invention.
1B is an enlarged view of part A of FIG. 1A.
Fig. 2A is an explanatory view for explaining the function of the weight attached to the chip side of the shaft of the embodiment. Fig.
FIG. 2B is a graph showing the acceleration of each portion of the golf club before and after the impact in the golf club of the embodiment. FIG.
2C is a graph showing the acceleration of each portion of the golf club during impact in the golf club of the above embodiment.
Fig. 3 is a graph showing the relationship between the attachment position of the weight and the back spin revolution number in the golf club according to the embodiment. Fig.
4 is a view showing a golf club using the shaft of the second embodiment.

A1. First Embodiment:

Figs. 1A and 1B are explanatory views showing a configuration of a golf club 1 using a shaft for a golf club according to the first embodiment. Fig. Fig. 1A shows the entire golf club 1, and Fig. 1B shows an enlarged view of a region A surrounded by a chain double-dashed line in Fig. 1A.

The golf club 1 is a golf club called a driver and includes a shaft 10, a head 20 attached to one end (chip) of the shaft 10, (Not shown). The shaft 10 is formed, for example, by winding a plurality of uncured sheets (prepregs) made of carbon fiber-reinforced resin (CFRP) into a core and then heating them to harden the prepreg.

The head 20 has a hollow structure integrally formed of a titanium alloy or the like and has a hosel 21 for attaching the shaft 10 through the sleeve 40. The shaft 10 and the sleeve 40 are fixed by fitting the chip side end of the shaft 10 into the shaft inserting hole 49 of the sleeve 40. The sleeve 40 is inserted into the hole formed in the hosel 21 and the step (sleeve step) between the opening end 22 of the hosel 21 and the sleeve 40, (42) are in contact with each other. The shaft 10 and the head 20 may be directly attached without using the sleeve 40.

1A and 1B, a weight 11 as a weight is attached to the outer periphery of the chip 10 side of the shaft 10. The weight 11 can be formed by winding a flexible metal sheet such as lead on the outer periphery of the shaft 10, for example. In this case, it is preferable to use a lead sheet as the metal sheet to comply with the rule. In addition, metal or resin members may be fixed to the inner surface of the shaft 10 as the weight. In addition, the present invention is not limited to the weight attached to such a shaft. For example, when a prepreg is wound in multiple, a heavy material is formed on the shaft 10 by inserting a prepreg or a metal sheet having a metal material having a high specific gravity, such as tungsten, . In addition, if the weight of the weight 11 increases, the effect of attaching the weight 11 increases, but the treatment of the golf club 1 becomes difficult. The weight of the weight 11 is set to, for example, 30 g or less in consideration of such characteristics.

Figs. 2A, 2B and 2C are explanatory diagrams for explaining the function of the weight 11 attached to the chip side of the shaft 10 (Fig. 1). 2A shows the behavior of the golf club GC during an impact when the ball BL is hit by a golf club GC to which the weight 11 is not attached. Here, the impact refers to a state in which the head HD of the golf club GC is in contact with the ball BL.

Figs. 2B and 2C are graphs showing accelerations of golf clubs GC before and after impact and during impact, respectively. 2B and 2C, the horizontal axis represents time, and the vertical axis represents the acceleration in the traveling direction (X direction) of the head HD and the shaft ST at the time of impact. 2B and 2C show accelerations of the head HD in the X direction, and the solid line shows the acceleration of the head HD at a position every 30 mm from the hosel top 22 (Fig. 1) to 0 mm to 210 mm The acceleration of the shaft ST in the X direction.

2A and 2B, when the head HD of the golf club GC comes into contact with the ball BL and the impact starts, the reaction of the hit is applied from the ball BL to the head HD, Starts to decelerate. 2B and 2C, the acceleration of the head HD in the X direction becomes negative from the start point of the impact (1.4 ms), and deceleration of the head HD is started. The acceleration of the head HD in the X direction is increased toward 0 by 0.5 ms (1.9 ms) after the head HD contacts the ball BL, and the impact of the impact of the ball BL off the head HD is terminated I start to retrench.

The force applied to the head HD as a reaction of the blow is transmitted to the shaft ST as shown in Fig. 2A. Therefore, as shown in Figs. 2B and 2C, the chip side portion (the shaft leading end portion) S1 of the shaft ST and the vicinity portion (near the tip end portion) S2 of the shaft leading end are arranged in order from the position close to the head HD (1.4ms) after the start of the impact (1.5ms) after the X-axis acceleration takes a sequential maximum value. The X-direction acceleration is then successively mini- mized and then reset to zero. During this impact, the head (HD) and the shaft front end portion (S1) rotate in the right direction as viewed from above the ground.

During the impact, since the head HD and the ball BL are in contact with each other, the shaft leading end portion S1, which decelerates during impact, functions as one with the head HD with respect to the ball BL. Therefore, by adding a heavy object (weight 11 in Fig. 1) to the shaft front end portion S1 as described above, similarly to the case where the center of the head HD is made high, It takes a spin. According to the first embodiment, by adding a heavy object to the shaft front end portion S1 which acts integrally with the head HD with respect to the ball BL, The centers of the regions (i.e., the head (HD), the shaft distal end portion (S1), and the weight (11)) acting on the balls (BL) become higher.

In addition, if the position at which the heavy object is added is too close to the head HD, the effect of backspin on the ball BL is reduced. Further, if the position at which the heavy object is added is too far from the head HD, the heavy object does not function as one with the head HD. Therefore, the position at which the heavy object is added starts to decrease in speed in the advancing direction (X direction) after 0.1ms to 0.3ms from the start of impact (1.3ms in Figs. 2B and 2C) (That is, the acceleration starts to become negative). The position at which the heavy object is added is appropriately changed in accordance with the propagation speed of the force (vibration) determined by the rigidity or the weight ratio of the shaft ST. In the case of the general shaft 10, 22) (FIG. 1) to the center of the heavy object is 30 mm to 90 mm.

In addition, since the additional position of the heavy object for enhancing the backspin enhancing effect is slightly distant from the head HD, the position is once accelerated in the advancing direction of the head HD at the start of impact, The acceleration in the traveling direction of the high-definition image (HD) takes a maximum value during the impact. In order to enhance the backspin enhancing effect, it is preferable that the acceleration in the direction opposite to the advancing direction (X direction) of the head HD (-X direction) at the end of the impact is high. Therefore, in order to increase the backspin enhancement effect, the weight of the heavy object is set such that the acceleration in the advancing direction of the head HD takes a maximum value during the impact and the acceleration in the advancing direction of the head HD during the impact on the maximum value It is preferable that the absolute value of the ratio of the minimum value (that is, the value obtained by dividing the minimum value by the maximum value) is set at a predetermined threshold value (for example, 16) or more.

As described above, according to the first embodiment, the weight (the weight 11) is provided on the chip side of the shaft 10 to enhance the backspin of the hit ball BL (ball), thereby facilitating control of the ball . Since the effect of the first embodiment can be realized by attaching the weight 11 to the shaft 10, it can be applied to a shaft designed in any way, and it is also possible to improve the existing shaft.

A2. Example:

It was confirmed that the backspin of the ball was enhanced by adding the weight (the weight 11) to the shaft 10 (Figs. 1A and 1B). More specifically, a golf club serving as a base to which the weight 11 is not attached is prepared, and the distance between the central position of the weight 11 and the hosel top 22 (attachment position of the weight) The ball was hit by changing the position every 30 mm to 300 mm using a golf club having the weight 11 attached thereto, and the number of revolutions of the back spin after the impact was measured. The weight of the weight 11 was 10 g.

3 is a graph showing the relationship between the attachment position of the weight 11 and the backspin revolution speed. 3, the dotted line extending in the transverse direction indicates the back spin revolution speed in the state in which the weight 11 is not attached (no weight).

As can be seen from Fig. 3, the backspin revolution speed was increased by about 100 rpm to 200 rpm from the state where the weight 11 was not attached (no weight) by setting the weight 11 to 30 mm to 90 mm. On the other hand, if the attachment position of the weight 11 is 120 mm or more, the backspin revolution speed decreases. If the attachment position of the weight 11 is 180 mm, the backspin revolution speed is the state in which the weight 11 is not attached Lt; / RTI > From the above results, it was found that it is possible to increase the backspin by attaching the weights 11 to the chip side of the shaft 10. In the golf club used for the evaluation, it was found that it is preferable to attach the weight 11 at a position of 30 mm to 90 mm at which deceleration is started at a time point 0.1 ms to 0.3 ms after the start of impact in order to enhance the backspin.

B. Second Embodiment:

Fig. 4 is an explanatory view showing the configuration of the golf club 1a according to the second embodiment, and shows a form of measuring the balance (club balance) of the golf club 1a. The golf club 1a of the second embodiment is different from the golf club 1 of the first embodiment in that a weight 12 as a weight is attached to the bat side of the shaft 10a. The other points are the same as the golf club 1 of the first embodiment, and a description thereof will be omitted here.

As shown in Fig. 4, the club balance (also referred to as " swing weight ") is a point (balance measurement point) at which a reference point having a distance Lp from the bat end of the golf club 1a is 35 inches (14 inches) (P). Here, the bat end refers to the end of the bat side when the golf club 1a is formed, that is, the end of the grip 30 on the bat side.

If the weight of the chip side becomes heavy on the basis of the balance measurement point P or the weight of the bat side becomes light, the weight of the head 20 when the swing is performed is increased. On the other hand, if the weight on the chip side becomes light on the basis of the balance measurement point P or if the weight on the bat side becomes heavy, the weight of the head 20 when the swing is performed is reduced. In general, as the weight increases, stability of the swing improves, but the head speed decreases. On the contrary, the head speed increases as the weight is smaller, but the stability of the swing is deteriorated. Therefore, the club balance needs to be appropriately adjusted depending on the physique of the golfer who is the user of the golf club, the characteristics of the swing, and the like.

In the second embodiment, a weight 11 is attached to the chip side of the shaft 10a as in the first embodiment. Since the weight 11 is located on the chip side rather than the balance measurement point P, the weight 11 is increased by the club balance. In the second embodiment, therefore, the weight 12 is attached to the bat side of the shaft 10a to suppress the change in the club balance. In order to suppress the change in the club balance, it is necessary to make the weight 12 heavy as the weight 12 falls from the bat end. Therefore, the attachment position of the weight 12 (that is, the center position of the weight 12 on the shaft 10a) is set so that the weight of the shaft 10 on the side of the bat 10 of the shaft 10 To 100 mm.

The weight W2 of the weight 12 is set such that the weight W1 of the weight 11 and the distance Lp from the batting end to the balance measuring point P (i.e., the reference point of the club balance) And the distance L2 from the batting end to the weight 12 is set to satisfy the following equation (1).

(1)

(One)

The club balance is changed by one point, which is the smallest unit, when the difference between the force moments of the chip side and the bat side relative to the balance measuring point P is changed by 1.75 in × oz (ounce). Here, when a weight of 3.6 g (0.127 oz) is added to the bat end which is 14 inches away from the balance measurement point P, the amount of change in the club balance becomes 14 in x 0.127 oz / (1.75 in x oz) = 1.02? Since the weight 12 is disposed at the position of the chip side from the bat end, the weight W2 of the weight 12 is set so as to satisfy the above formula, so that the change in the club balance from the state in which the weights 11 and 12 are not used It is possible to suppress the deviation to less than +/- 1 point.

In addition, even when the weight W2 of the weight 12 does not satisfy the above formula, the change of the club balance due to the attachment of the weight 11 on the chip side can be suppressed by attaching the weight 12. [ Therefore, the weight W2 of the weight 12 on the bat side does not always have to satisfy the above formula.

According to the second embodiment, it is possible to suppress the change in the club balance, thereby making it easier to swing the golf club 1a (ease of swing).

(Weights 11 and 12) are provided at two positions of the chip side and the bat side of the shaft 10a according to the second embodiment so that changes in the club balance can be suppressed to secure the ease of swinging the golf club 1, It is possible to more easily control the batted ball by enhancing the spin. The effect of the second embodiment is realized by attaching the weights 11 and 12 to the shaft 10a, so that it can be applied to a shaft designed in a way and also it is possible to improve the existing shaft.

C. Modifications:

The present invention is not limited to the above-described embodiment, but can be practiced in various embodiments within the scope not departing from the gist of the invention. For example, the following modifications are possible.

C1. Modified Example 1:

Although the present invention is applied to a driver in the above embodiment, the golf club to which the present invention is applied is not limited to a driver, but may be applied to a wood-based golf club such as a fairway wood, a golf club to be referred to as a utility, It is possible.

1, 1a: golf club 10, 10a: shaft
11, 12: weight 20: head
21: Hosel 22: Hosel top
30: grip 40: sleeve
41: sleeve tip 42: sleeve step
49: Shaft in-hole BL: Ball
GC: Golf Club HD: Head
S1: front end of shaft S2:
ST: Shaft

Claims (3)

A shaft for a golf club to which the head is attached by a hosel mounted on the head,
When the head strikes the ball,
At a time of 0.1 ms to 0.3 ms from the start of the blow,
Wherein a weight is provided in a region in the vicinity of an opening end of the hosel on the shaft in a region where the velocity in the traveling direction of the head starts to decrease. A shaft for a golf club to which the head is attached by a hosel mounted on the head,
During impact when the head strikes the ball,
An acceleration in the traveling direction of the head in a region near the opening end of the hosel on the shaft takes a maximum value and an absolute value of a ratio of the minimum value of the acceleration during the impact to the maximum value is 16 or more Shafts for golf clubs with heavy loads. 3. The method according to claim 1 or 2,
Wherein the weight of the shaft is 30 g or less.

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