JP3104132U - Golf club shaft with improved flight distance and directionality - Google Patents

Abstract

An object of the present invention is to easily remodel a shaft of a commercially available golf club into a shaft satisfying two elements of a flight distance and a direction.
A shaft made of carbon fiber or the like is filled with a lightweight solidifying agent such as foamed polyurethane in a predetermined length range, and a kick point and a torque of the shaft are modified so as to fit a user's swing. .
[Effect] When purchasing a golf club shaft, it is difficult to obtain a golf club shaft that matches the timing of the swing of the user. If foamed polyurethane is filled, the flight distance and directionality of the golf club can be improved.
[Selection diagram] Fig. 1

Description

  The present invention relates to a golf club shaft structure with improved flight distance and directionality.

  Conventionally, golf club shafts made of steel, carbon fiber, or the like have been used. In the case of steel, the weight of the head and the flexibility (softness, flexibility) of the shaft have been selected and used according to the strength of the swing force of the golf club user. As a result, the stronger the swing force, the heavier the head and the less flexible the shaft. Later, as carbon fiber shafts were developed, the shafts had great flexibility, so even a person with a relatively weak swing force or a person with a strong swing force could obtain a good flight distance by hitting with good timing. That is, it has spread widely. However, carbon fiber shafts are lightweight and easy to swing, but because of their high flexibility, it is difficult to take the timing of impact, and the degree of twisting of the shaft is large, so that it is easy to obtain a hit ball with good flight distance and directionality. There is a problem that is not.

  Golf clubs have a kick point, which is the place where the shaft is the best. The grip is closer to the hand, the head closer to the front, and the middle between them. Also, the degree of twisting when the shaft is twisted is called torque, and it is not always possible to obtain a good hitting point just by matching the weight and hardness of the shaft, so change the hitting point by adjusting the kick point There is a need. If the kick point is different, the hit point will change even if you swim with the same rhythm. The higher the kick point is, the greater the deflection of the shaft, and the closer the kick point is, the slower the shaft returns, so the impact timing is also delayed.

  As shown in FIG. 1, even if the shaft has the same hardness, the portion that is assumed to be in hand is large, the rhythm that returns is slowed down by that amount, and as shown in FIG. 2, the portion that is assumed to be in front is reduced, The return rhythm is also faster. For example, if you release the cock early, there will be time until the impact so there is a hand condition that returns slowly, and if you release the cock at once, the return condition will return quickly, such as meeting the rhythm of the swing and the rhythm of the shaft, such as timing It hits well and the hit point is stable.

  The torque represents the degree of twist of the shaft, and the greater the torque, the greater the twist of the shaft. Since the golf club does not have the center of gravity of the head on the extension of the shaft, a force for twisting the shaft acts during the swing, and the greater the torque, the greater the degree of twisting and the slower the return speed. For this reason, a golfer of the type that releases at a stroke is likely to fly to the right because the face does not return to a square when the torque is increased, or the head is easily twisted by a miss hit, and the degree of mistake is likely to increase.

  The performance of a golf club shaft must satisfy two factors: flight distance and directionality. The biggest factor that determines the flight distance is to increase the head speed, and for that purpose, it is necessary to optimize the bending width of the shaft. The flex width of the shaft is determined by the softness and kick point of the shaft. As mentioned above, the kick point is where the shaft is most bent, the grip closer to the hand, the head closer to the front, and the middle the middle. The softer the shaft and the closer the kick point is, the larger the swing of the shaft, the higher the head speed and the longer the flight distance, but the slower the impact timing and the easier it is to bend. Therefore, by filling a lightweight solidifying agent, such as polyurethane foam, into the hand of the shaft, which has a large runout and a long flight distance, a shaft with a runout width suitable for the user can be obtained. In addition, a shaft that does not bend and satisfies the two factors of flight distance and direction can be obtained.

Conventionally, in a golf club, an intermediate layer is formed between the inner layer and the outer layer on the large diameter side of the club shaft to shift the balance point to the large diameter side, and the fiber configuration, range, and thickness of the intermediate layer are arbitrarily changed. Although there is a patent document 1 which makes such a structure complicated and difficult to manufacture, it cannot be applied to the present invention at all to change the function of the shaft.
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  SUMMARY OF THE INVENTION The present invention provides a golf club that is easily remodeled into a shaft that satisfies the two factors of flight distance and direction according to the user according to the user.

  Here, the present inventor has designed a golf club shaft in which the kick point and torque of the shaft have been modified so as to fit the swing of the user by forming a foamed polyurethane in a predetermined length range in the shaft made of carbon fiber or the like. I came to find out.

  In the present invention, a commercially available two-pack type polyurethane foam is used. If you determine the kick point position that matches the user's timing and inject the two-component foamed polyurethane into the predetermined length position, the foamed polyurethane solidified in the shaft is obtained, and the foamed polyurethane adheres to the inner wall of the shaft Therefore, bending and twisting are suppressed at the length position, a shaft of the golf club suitable for the timing of the swing at the time of the user can be obtained, and the flight distance and directionality can be improved.

  When purchasing a golf club shaft, it is difficult to obtain a shaft having a kick point that matches the timing of the user's swing, so after purchase, check the position of the kick point that matches the timing of the user's swing, and If the foamed polyurethane is filled at an appropriate position in the shaft so as to obtain such a kick point, the flight distance and directionality of the golf club can be improved.

  If the kick point of the shaft of the golf club does not match the user, a favorable hit ball cannot be obtained. For example, if a person who is in good condition at hand uses the first condition, it may cause a mistake. This is because the head returns faster and hits the top or hits the heel, even when the body is not in impact. Also, if the torque does not match, the impact timing is shifted. That is, the smaller the torque is, the less the twist of the shaft is, and the faster the return, the faster the return of the head. In this way, after the downswing, the club moves on its own due to the characteristics of the shaft such as kick point and torque, so even if you try to match the swing with the player even if the shaft does not match, it will not fly or cause a mistake It is easy to become.

In order to move the kick point of the golf club shaft, the shaft is filled with polyurethane foam. As shown in FIG. 2, when the foamed polyurethane is filled in the hand, the torque is reduced, and the directionality of the ball can be improved.
When the shaft is filled with the polyurethane foam, the operation is easy regardless of whether the shaft is removed from the golf club. For example, when the foamed polyurethane is filled on the proximal side of the shaft, the filling may be applied to the lower end of the shaft in advance.

Explanatory drawing when the foamed polyurethane is filled into the tip of the shaft of a golf club Explanatory drawing in the case where a foamed polyurethane is filled in a hand portion of a shaft of a golf club.

Explanation of reference numerals

1 Golf club shaft
2 Foamed polyurethane

Claims (1)

A golf club shaft formed by filling a predetermined length range in the shaft with foamed polyurethane.

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