JPH09262328A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the soaring up of a ball, to enable a golfer to easily obtain timing and to improve a carry by specifying the ratio of the forward deflection to the reverse deflection of the shaft of a golf club of a wood system and particularly a golf club for a hard hitter which is high in head speed. SOLUTION: The golf club for the hard hitter has a head 2 of a wood system at the front end of the shaft 1 and is formed to a club length of >=43.5 inches and a swing balance of D>=2.0 by a 14-inch method. In such a case, the shaft 1 is formed to >=1.20 in the ratio of the forward deflection to the reverse deflection. Namely, in the case of formation of the shaft 1 by carbon fiber reinforced resins, the carbon fiber reinforced resin layers are wound more by 1 to 2 layers in the shaft 1 in a range of about 500 to 700mm from its front end and one layer of the unidirectional prepreg of the glass fibers for surface polishing is wound thereon; thereafter, the shaft is taped with a stretched tape and the resins are cured by heating. Finally, the prescribed finishing is executed, by which the shaft 1 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood type golf club, and particularly to a high head speed (45 m / m).
s or more) A golf club for hard hitters.

[0002]

2. Description of the Related Art A wood-based golf club for hard hitters with a fast head speed, if the club weight is too light, hits only with a small hand, and the ball hooks or catches the ball. ~
Weighing about 125g and the weight of the head, 14
The swing balance according to the inch method was set to D2.0 or more.

[0003]

A ball hit by a hard hitter is easily blown up. If the ball hits too high, it is disadvantageous in terms of flight distance and is easily affected by wind.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a golf club which suppresses upswing of a ball, is easy to take timing, is easy to hit a straight ball, and has an improved flight distance.

[0005]

In order to achieve the above object, the present invention is provided with a wood-type head at the tip of a shaft, a club length of 43.5 inches or more, and a swing balance by the 14-inch method. A golf club having a D2.0 or more is provided with a shaft having a ratio of forward deflection to inverse deflection of the shaft of 1.20 or more.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

The golf club of the present invention is provided with a wood-based head 2 at the tip of a shaft 1 and has a club length of 4
Swing balance of 3.5 inches or more and 14 inches method is D2.0 or more. Further, the shaft 1 shown in FIG.
Shows one means for adjusting the ratio of the forward deflection to the inverse deflection to 1.20 or more. Such a ratio is 1.20
In order to achieve the above, as shown in FIG. 1, when forming the shaft 1 from the carbon fiber reinforced resin, one to two more carbon fiber reinforced resin layers are wound over the range of 500 to 700 mm from the tip of the shaft 1. Usually shaft 1
Is about 8 to 16 layers. The above-mentioned resin sheet to be additionally wound is indicated by reference numeral 1A. To make a so-called carbon shaft, for example, a unidirectional prepreg (carbon fiber reinforced resin sheet) with a thickness of about 120 μm is cut on a mandrel of a shaft type into a trapezoidal shape with an unequal leg angle of +45.
A total of 8 layers are wound at 4 ° each at 4 ° and −45 °, and a prepreg for a straight layer (thickness 130 μm) is cut into an isosceles trapezoidal shape and wound at 4 layers. Next, after wrapping around the tip side, one or two layers of the resin sheet 1A in which carbon fibers are arranged so as to be oriented in the axial direction of the shaft are wrapped around, and a unidirectional prepreg of glass fiber having a thickness of 85 μm for surface polishing is further wound thereon Taping is performed with a polypropylene stretched tape and heat-cured. Finally, the shaft is created by performing predetermined finishing such as cutting and polishing the upper and lower ends. The above + 45 ° and −45 ° indicate carbon fiber orientation angles with respect to the axial direction of the shaft. Further, the prepreg for the straight layer has no fiber orientation angle.

The swing balance according to the 14-inch method is
14 from the grip end of the finished golf club
With the inch as the fulcrum, multiply the total weight of the club by the distance from the center of gravity of the club to the center of gravity, and divide by 14. This is divided into 6 stages of A to F, and each of them is divided into 0 to 9 by 10 to be divided into 60 in total.

The forward deflection of the shaft 1 is measured by the method shown in FIG. The golf club used here is a finished product to which the grip 3 is attached. In Fig. 2, the club is supported at the points A and B, and 2.7 kg is attached to the tip side.
Attach the weight W of. The length a from the grip end to the fulcrum A with respect to the club length L is as follows. When the club length L is 43.5 inches, the length from the grip end to the fulcrum A is 65 mm. When the length L is 44 inches, it is 78 mm.

FIG. 3 shows a method for measuring the reverse deflection, in which the fulcrums A and B are on the head side and the grip 3 is 1.2.
A weight W of 5 kg was provided. The length a from the grip end to the place where the weight W is provided is the same as in the case of the measurement of the forward deflection. The unit of the numbers in FIGS. 2 and 3 is mm.
As described above, the forward and reverse deflections are based on the measuring method defined by the Japan Golf Equipment Association.

FIG. 4 shows a flexure amount measuring device, and shows a case where the forward flexure shown in FIG. 2 is measured. Reference numeral 10 indicates a measurement plate, and reference numeral 11 indicates a deflection amount measurement cursor.

Next, Examples 1 and 2 of the present invention and Comparative Example 1
Were manufactured under the conditions shown in the following table.

[0013]

[Table 1]

The results of trial hitting the golf clubs shown in Table 1 are shown in Table 2 below.

[0015]

[Table 2]

As is clear from the results of Table 2, in Examples 1 and 2, the dynamic loft at the time of impact,
As a result, the amount of backspin was reduced, and it was difficult for the hit ball to blow up.

The club length is preferably in the range of 43.5 inches to 46 inches, and the shaft length is 1090 to 120.
Within the range of 0, the weight is preferably about 85 to 125 g. The torque of the shaft 1 is 3.0 ° or less, preferably 2.5 ° to 1.0 °. The weight of the head 2 is preferably in the range of 195 g to 220 g.
Furthermore, the grip 3 is a rubber grip, and the grip weight is 4
A range of 8 g to 55 g is suitable. As a material for forming the shaft 1, a fiber-reinforced resin is preferable as described above, and as the reinforcing fiber, carbon fiber, metal fiber, ceramic fiber, organic fiber, boron fiber, tungsten fiber, or the like is preferably used. The material for forming the head 2 has a head volume of 160 to 230 cc, preferably 180.
~ 220 cc stainless head or volume 20
A titanium alloy of 0 cc to 265 cc, preferably 220 to 250 cc, can be preferably used. Of course, the head 2 may be formed of other metal materials. Further, as the head 2 for a hard hitter having a head speed of 45 m / s or more, in the case of a cast product, it is preferable to provide a rib on the back side of the face surface.

[0018]

As described above, according to the present invention, the tip of the shaft has the wood head, the club length is 43.5 inches or more, and the swing balance by the 14-inch method is D2.0 or more. Since the ratio of the forward deflection to the reverse deflection of the shaft is 1.20 or more, even if a hard hitter with a fast head speed hits the ball, it prevents the ball from blowing up and the ball flies stably. Like Also, because of its constant weight,
It will not be hit only with the tip of a small hand, and the timing will be easier.

[Brief description of drawings]

FIG. 1 is an explanatory view of a state in which a resin layer is wound around a tip end side of a shaft.

FIG. 2 is a diagram showing a method for measuring forward deflection.

FIG. 3 is a diagram showing a method for measuring the inverse deflection.

FIG. 4 is a perspective view showing a deflection amount measuring device.

[Explanation of symbols]

 1 shaft 2 head 3 grip

Claims (1)

[Claims] 1. A golf club provided with a wood-type head at the tip of the shaft, having a club length of 43.5 inches or more and a swing balance of D2.0 or more according to the 14-inch method, against the reverse deflection of the shaft. Normal deflection ratio is 1.2
A golf club having a shaft of 0 or more.