JPH05161727A - Shaft set for golf club - Google Patents

Abstract

PURPOSE:To provide a shaft for a golf club capable of arranging the swing balance of each club nearly constant in a golf club set. CONSTITUTION:Each shaft is constituted of an inner layer 1 made of carbon fibers impregnated with epoxy resin formed by the filament winding method, an outer layer 2, and a paint film 3. The weight of the shaft is increased in steps by the increase of thickness as the club number is increased, i.e., as the length of the shaft is shortened in sequence. It is unnecessary to increase the weight of the portion other than the shaft to arrange the swing balance nearly constant as the golf club number is increased like in the past, and such problem that a club head becomes too effective is not generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft for a golf club set.

[0002]

2. Description of the Related Art Golf club shafts (hereinafter referred to as shafts) include so-called wood club shafts and iron shafts. Of these, the iron shafts use 9 to 11 shafts for one set,
The length, weight, hardness, etc. are originally required to be set according to the specifications of each club. However, conventionally, for technical and economical reasons, only one kind of shaft is cut into a predetermined length and used for each count.

[0003]

However, in recent years, there has been a tendency among especially advanced users to desire a shaft having a changed length, weight and hardness in a set.
In connection with this, conventionally, it has been a basic requirement for both advanced and intermediate players to make the swing balance of each club in the club set substantially constant. However, the conventional technology cannot completely meet this demand. That is, in the conventional method, one type of shaft is cut and used for each count, and as shown in FIG. 2, the weight becomes lighter as the shaft count increases, that is, as the shaft count decreases. In order to make the swing balance of each club uniform using such a shaft, it is necessary to assemble the club by adjusting the weight other than the shaft by increasing the weight of the head or adding a weight to the tip of the shaft. (See FIG. 3), and as a result, the problem that the so-called head worked too much as the count became large was not preferable.

The present invention has been made for the purpose of providing a golf club shaft set which does not have the above problems.

[0005]

SUMMARY OF THE INVENTION The present invention is a golf club shaft set for use in a golf club set in which the loft angle gradually increases as the club count increases, and the club count increases and the length increases. A shaft set for a golf club, comprising a club whose weight increases sequentially or stepwise as the wall thickness increases as the wall length becomes shorter.

The shaft according to the present invention is preferably made of fiber reinforced plastic formed by the filament winding method.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 (A) is a cross-sectional view of the shaft in the golf club shaft set of the present invention, and FIG. 1 (B) is a graph showing the relationship between the count and weight of the shaft of the present invention.

The shaft according to the present invention comprises an inner layer 1, an outer layer 2 and a coating film 3 made of FRP. The weight increases by increasing the wall thickness because the hardness increases as the count increases and the length decreases. It is formed as follows so that the amount of weight reduction due to the shortening of the length becomes substantially equal.

First, the so-called long iron shafts of counts 2, 3 and 4 have an outer diameter of 5 to 13.0 mm and a total length of 13
00 mm taper core metal with tensile modulus of 4 as inner layer material
0t / mm ² carbon fiber (trade name: trading card M40, Toray Industries, Inc.)
Epoxy resin (trade name: YD128, manufactured by Tohto Kasei Co., Ltd.) was impregnated in the product) and wound by a filament winding method at an orientation angle of ± 45 ° until the thickness on the large diameter side became 0.4 mm. Next, as the outer layer material, the tensile strength is 360 to 3
80 kg / mm ² carbon fiber (trade name Torayca T300, manufactured by Toray Industries, Inc.) impregnated with the same epoxy resin as above is similarly used until the thickness of the thick side becomes 1.0 mm at an orientation angle of ± 7 degrees. Wrapped around. Next, wrap a tape made of synthetic resin, cure the resin in the autoclave, then pull out the core metal,
After that, it was cut into a predetermined length by a conventional method, and the surface was polished and painted to obtain a finished product. The total length of the shaft is 40, 39.5, 39 inches in the order of counts 2, 3, 4.

Next, the so-called middle iron shafts of counts 5, 6 and 7 have an outer diameter of 4 to 12.5 mm and a total length of 130.
A carbon fiber (Torayca M40) was impregnated with an epoxy resin (YD128) as an inner layer material around a 0 mm tapered core metal, and was wound by a filament winding method at an orientation angle of ± 45 degrees until the thickness on the large diameter side became 0.4 mm. Next, as the outer layer material, carbon fiber (Torayca T300) and epoxy resin (YD
128) impregnated with an orientation angle of ± 15 degrees and a thickness on the large diameter side of 1.0
Wrap it in the same way until it becomes mm, cure and cut as above,
Finished by polishing and painting. The total length of the shaft is 38.5, 38, and 37.5 inches in the order of counts 5, 6, and 7.

Further, the so-called short iron shafts with counts 8, 9 and PW are tapered cores having an outer diameter of 3 to 12.0 mm and a total length of 1300 mm, carbon fiber (Torayca M40) as an inner layer material, and epoxy resin (YD128). ) And the orientation angle ± 45 by the filament winding method
It was wound until the thickness on the large diameter side became 0.4 mm. Next, as the outer layer material, carbon fiber (Torayca T300) is impregnated with epoxy resin (YD128) and wound in the same manner until the thickness on the large diameter side becomes 1.0 mm at an orientation angle of ± 20 degrees, and curing, cutting and polishing are performed in the same manner as above. , Painted and finished product. The total length of the shaft is 37, 36.
It is 5,36 inches.

Table 1 shows the weights of the shafts obtained in the above examples and the conventional shaft.

[0013]

[Table 1]

As shown in Table 1, the shaft of the conventional method has a large number of counts, that is, the weight gradually decreases as the length becomes shorter, but in the case of the shaft of the present invention, the weight gradually increases. There is. Therefore, the swing balance in the club set using this becomes substantially constant.

[0015]

According to the present invention, it is possible to obtain a shaft which can easily make the swing balance in the club set substantially constant. Therefore, the weight of the club is not concentrated near the head, and the so-called head is too effective. It was possible to eliminate the drawbacks, and it became possible to make a club set especially suitable for advanced players. Further, since the wall thickness increases as the club count increases, the bending rigidity increases.

[Brief description of drawings]

FIG. 1A is a sectional view of a shaft in a golf club shaft set of the present invention, and FIG. 1B is a graph showing the relationship between the count and weight of the shaft of the present invention.

FIG. 2 is a graph showing a count and a weight of a shaft in a conventional shaft set.

FIG. 3 is a graph illustrating the relationship between the weight adjustment and the swing balance when a conventional golf club set is used.

[Explanation of symbols]

 1 ... inner layer 2 ... outer layer 3 ... coating film

Claims (2)

[Claims] 1. A shaft set for a golf club used in a golf club set in which the loft angle gradually increases as the club count increases, and the wall thickness increases as the club count increases and the length decreases sequentially. A golf club shaft set comprising a club whose weight increases sequentially or stepwise. 2. The golf club shaft set according to claim 1, wherein the shaft set is made of a fiber-reinforced plastic formed by a filament winding method.