JP3061252B2 - Golf club set - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a set of golf clubs. Iron club set (eg 2 to 10
No. and sand wedge), as well as a wood club set (for example, No. 1 to No. 5).

[0002]

2. Description of the Related Art In a conventional golf club set, generally, each golf club in the set is manufactured by cutting off the tip of the same shaft, so that the position of the kick point (maximum bending point) of the shaft is determined by the length. Shorter high-count golf clubs were closer to the head. Also, Japanese Unexamined Patent Publication No.
Japanese Patent Publication No. 272068 discloses a golf club set in which a lower-numbered golf club having a longer shaft positively has a flex zone where the shaft is located closer to the head and has a flexible zone.

[0003]

However, if the length of the shaft tip (from the kick point to the tip) where the former can be hit with a bend becomes longer, the timing of hitting the ball at the time of hitting is delayed, In a set that affects the hitting ball form and the tip length becomes shorter as the count becomes higher in this way, there is no uniformity in the hitting form in the set due to the difference in hitting timing, and the hitting ball according to the difference in the tip length The form has to be changed, making it difficult to use. Further, in the latter, the above-described tip length becomes longer as the number of golf clubs becomes higher, contrary to the above-mentioned general conventional golf club set. There is no change in being forced to change, and it is hard to use. Furthermore, if the length of the tip is shorter, the return of the head when hitting the ball becomes smaller, and the face does not face up so much that the ball tends to have a lower trajectory. Conversely, if the length is longer, the head returns. And the face is more likely to face up, resulting in a high trajectory, which makes it difficult to hit the target place after all. For this reason, the hitting ball form must be changed according to the tip length.

[0004] Accordingly, an object of the present invention is to provide a golf club set that can impart uniformity to the hitting ball form in the set. In addition to the above objects, it is another object of the present invention to provide a golf club set in which the shot feeling at the time of hitting is improved and an accurate shot is easily made.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned object, the present invention relates to the first aspect, wherein the length from the golf club head fastening position of the shaft tip to the kick point is made substantially the same regardless of the count. A featured golf club set is provided. According to a second aspect of the present invention, the golf club set is configured such that the bending rigidity of the shaft from the kick point to the grip side region increases as the number of golf clubs increases.

According to a third aspect of the present invention, in the golf club set of the second aspect, each golf club shaft is formed by winding a prepreg in which high-strength fiber is impregnated with a synthetic resin, and forms a main layer substantially over the entire length of the shaft. The prepreg is made of a high-strength fiber having the same longitudinal elastic modulus regardless of the yarn count, is overlaid on the main layer, and has a kick point as an end. The high-strength fiber is configured so that the longitudinal elastic modulus of the high-strength fiber is equal to or higher than that of the low-strength golf club.

[0007]

[Action] Regardless of the count, the length from the kick point to the tip is substantially the same, preventing a shift in the hitting timing at the time of hitting the ball. This makes it easier to hit the target in the way of hitting, and gives uniformity to the hitting form in the set. The goal of low-count golf clubs is to hit the ball strongly with a full swing to give a flight distance, and the goal of high-count golf clubs is to reduce the swing and control the fall position more accurately than the flight distance. It is. Therefore, a golf club having a high count has a small hitting force of a ball, so that it is preferable that the golf club is manufactured to have higher rigidity than a golf club having a low count, from the viewpoint of improving the hitting sensation for controlling the hitting ball. If the length from the kick point to the tip is substantially the same irrespective of the count, the area of low rigidity increases correspondingly at a high count, and the sense of impact is reduced. Therefore, by increasing the bending rigidity of the shaft in the region from the kick point to the grip side, it is possible to improve the feel of impact.

A prepreg that forms a main layer over the entire length of the shaft uses high-strength fibers having the same longitudinal elastic modulus regardless of the number, and is superimposed on the main layer, with the kick point as an end and in the grip side region. The longitudinal elastic modulus of the high-strength fiber of the first auxiliary layer formed by the disposed prepreg is
If the high count is equal to or greater than the low count, the bending rigidity of the shaft from the kick point to the grip side region increases as the count increases, and the feel of impact improves. Such a set of properties is only possible with the selection of high-strength fibers and is easy to manufacture.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows ten golf club iron sets according to the present invention. The clubs B2, B3, and B4, which are 2nd to 4th, are long iron LI, the clubs B5, B6, and B7 are middle iron MI, and the club B, which is 8th to 10th.
8, B9, B10 and the sand wedge SW are referred to as short iron SI. Each club is fixed to a head H having a face F for hitting a golf ball at a tip of a shaft S formed of a prepreg or a metal in which a high-strength fiber is impregnated with a resin such as a thermosetting synthetic resin. A grip G formed by covering a rubber member or the like is provided at an upper portion.

Each club bends at the time of swinging, but the position KP where the deflection is the largest in the longitudinal direction is called a kick point. In the present invention, the length L from the fastening upper position of each head to the kick point KP is counted. The kick point KP is substantially constant regardless of the height, and a line connecting the kick points KP is indicated by LK. A line indicated by a one-dot chain line PL is a schematic line connecting kick points in a conventional general golf club set. If the length L from the upper end of the head to the kick point is set to be substantially the same in the set as described above, the front region L approaches the ball with a delay compared to the upper portion of the club during the swing. With this configuration, the delay state is unified, the timing of hitting the golf ball due to the change in the club number is prevented, and the head returns when hitting is almost the same, so that the hitting form in the set is unified. It is a club set that is easy to use and has good sex.

FIG. 2 is an explanatory view of a method of manufacturing a golf club shaft S according to the present invention. The carbon has a shaft length approximately equal to the number of the object to be manufactured, and the fiber direction is oriented substantially at 45 degrees. A sheet prepreg M1 in which a woven fabric such as a fiber scrim sheet is impregnated with an epoxy resin is wound around a cored bar 10 coated with a release agent. A sheet prepreg M having the same length as that of the prepreg M1 and impregnated with epoxy resin in a carbon fiber bundle aligned in the longitudinal direction.
2 and M3 are wound. These sheet prepregs M
1, M2 and M3 are main prepregs MP, which form a layer which is a main component of the golf club shaft. The following auxiliary prepreg SP is wound thereon. In this embodiment, the auxiliary prepreg SP is obtained by impregnating a carbon fiber bundle aligned in the longitudinal direction with an epoxy resin.

First, the first auxiliary prepreg S1 is wound so that the position of the line KP 'corresponding to the kick point KP is set as the lower end, and the upper end is substantially aligned with the upper end position of the main prepreg MP to form the first auxiliary layer. I do. The other auxiliary prepregs S2, S3, S4 are also wound so that the upper end is substantially aligned with the upper end of the main prepreg MP. Each auxiliary prepreg S
2, the length of S3 and S4 is gradually reduced as the prepreg is wound outward, and the shaft S is configured to have a larger diameter and a greater thickness as it goes upward. After the prepreg is wound in this manner, the prepreg is heated and cured while being pressed with a tightening tape or the like, thereby forming a golf club shaft.

In manufacturing a club shaft of another count, the lengths of the main prepreg MP and the auxiliary prepreg SP are changed, but the lower end position of the first auxiliary prepreg S1 is located at the line KP 'of the main prepreg MP. No change, high strength fiber of main prepreg MP (carbon fiber)
Even if the count is changed, one having the same longitudinal elastic modulus (a degree of variation in physical properties of the fiber is allowed) is used. However, in the auxiliary prepreg SP, the longitudinal elastic modulus (t
on / mm ² ).

[0014]

Therefore, the club tip region L of the club has the same degree of bending rigidity irrespective of the count, but the higher the count above the kick point KP (on the grip side), the higher the rigidity, and the feeling of impact (vibration) of the ball is reduced. It is easy to be transmitted to the grip side,
Improves the impact sensation. Therefore, it is easy to accurately shot the ball at a high count. In addition, since the golf club set whose rigidity is adjusted can be formed by changing the longitudinal elastic modulus as described above, the set can be easily manufactured.

In the above embodiment, the carbon fiber has a wide range of longitudinal elastic modulus and is easy to select. Therefore, a carbon fiber is used as the high-strength fiber, and the shaft is formed from the same type of carbon fiber. In addition, as the high-strength fiber, glass fiber or the like may be used, or a mixture of these may be used. Further, the shaft may be made of metal.

[0017]

As is apparent from the above description, according to the present invention, since the lengths from the kick point to the tip of the set are set to be substantially the same, uniformity can be given to the hitting ball form in each club. The set is easy to use. Further, if the bending rigidity in the region above the kick point is improved as the club number becomes higher, the sense of impact at the time of hitting is improved, and an accurate shot becomes possible. The adjustment of the bending stiffness is easy if the longitudinal elastic modulus of the high-strength fiber is selected, and the production of club sets having different bending stiffness is simplified.

[Brief description of the drawings]

FIG. 1 is a view of a golf club iron set according to the present invention.

FIG. 2 is a view for explaining a method of manufacturing the shaft of the golf club of FIG. 1;

[Explanation of symbols]

 KP kick point S shaft

Claims (3)

(57) [Claims] 1. A golf club set wherein the length from the golf club head fastening position at the shaft tip to the kick point is substantially the same irrespective of the count. 2. The golf club set according to claim 1, wherein the higher the golf club number, the greater the bending rigidity of the shaft from the kick point to the grip side region. 3. Each golf club shaft is formed by winding a prepreg obtained by impregnating a high-strength fiber with a synthetic resin, and the prepreg, which forms a main layer substantially over the entire length of the shaft, has the same longitudinal elastic modulus regardless of the count. The longitudinal elastic modulus of the high-strength fiber of the first auxiliary layer formed by a prepreg disposed on the grip side region with the kick point as an end using a high-strength fiber having 3. The golf club set according to claim 2, wherein the club is equal to or more than a low-number golf club.