JP3220954B2 - Golf club head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head having a sole width equal to or larger than a face height, that is, a golf club head called a so-called wood club.

[0002]

2. Description of the Related Art A conventional wood club head is made of a metal material such as stainless steel, aluminum alloy, titanium alloy, magnesium alloy, or fiber reinforced plastic (FRP) as a forming material, and has strength, weight, and center of gravity. Various sizes have been developed in consideration of cost and cost.

In recent years, attempts have been made to increase the size of the driver's head, enlarge the sweet area, and increase the moment of inertia. The maximum flight distance is obtained when hitting the ball at the sweet spot of the head, but in practice, the hit is often taken off the spot. Amateur golfers try to hit the ball at the geometric center of the face of the head, but many of the heads do not always coincide with the geometric center and the sweet spot. In order to minimize the drop in flight distance even if a hit is made without the sweet spot, it is desired to expand the sweet area. Here, the sweet area is a point that is 2.5% of the maximum flight distance left and right from the ball drop point when hitting at the sweet spot, and 5% of the maximum flight distance in the direction of the hit point from the drop point. The maximum flight distance of 2.5 from left to right from the point
All the collective areas on the face of the club head where the ball falls into a square area having a vertex at a point separated by%.

[0004]

A conventional so-called deca head has a head volume of about 200 cc. There is a demand for a head that can be hit more easily than such a deca head and that minimizes the decrease in flight distance even during an off-center hit. For this purpose, it is necessary to further enlarge the sweet area, further increase the distance between the position of the center of gravity and the face surface, and not cause a problem in strength.

Accordingly, an object of the present invention is to provide a golf club head which further enlarges the sweet area, deepens the center of gravity, and has no problem in strength.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a golf club head having a sole width equal to or greater than a face height, wherein the golf club head has a face surface and a head material other than the face surface. The head is formed by using a magnesium alloy having a specific strength of 140 or more, and the maximum head height of the face surface is 48 mm or more, the shaft reference head length is 86 mm or more, and the maximum head width is 85 mm or more.

[0007]

According to the present invention, since the face and the head excluding the face are formed from a material having a specific strength of 140 or more, there is no problem in the strength, and the head can be made larger. The area can be enlarged. For example, if the head volume is 250 cc or more, the sweet area is significantly expanded and the center of gravity is deepened,
Improves ballistic stability in the horizontal direction of the ball.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a front view of the golf club head, wherein the maximum head height H of the face surface 1 is 48 mm or more, and the shaft reference head length L is 86 mm or more. The shaft reference head length L refers to a distance between a plane passing through the center axis of the shaft 2 and a plane parallel to the plane and in contact with the toe side of the head. Face 1 and Face 1
A magnesium alloy having a specific strength of 140 or more is used as a head forming material except for. The specific strength is the tensile strength (M
Pa) divided by the density (g / cm ³ ). The specific strength of the metal material is titanium, stainless steel, aluminum, and magnesium in the order of higher specific strength. Therefore, titanium is optimal when considering the material only with the specific strength, but titanium has a problem in cost. In addition, stainless steel has a problem in reducing the weight of the head in terms of specific gravity. Aluminum is inferior in specific gravity as compared with magnesium. By forming the entire head including the face surface 1 in such a metal material from a magnesium alloy,
The weight of the head is about the same as the weight of the conventional head, while the head is made larger and the problem of strength does not occur.

FIG. 2 is a side view of the head, in which the maximum head width W is 85 mm or more. The golf club head shown in FIGS. 1 and 2 is entirely made of a magnesium alloy having a specific strength of 140 or more, and the head maximum height H of the face surface 1 is set to 51.3.
mm, the shaft reference head length L was 89.5 mm, the head maximum width W was 86 mm, and the head volume was 260 cc. The crown 3 of the head had a thickness of 1 mm, and the other thicknesses were 3.5 mm. As a result, the weight and the center of gravity were reduced. The inside of this head is filled with urethane foam or the like in the cavity or inside. Triangular ribs 4 were attached between the face 1 of the head and the crown 3 to a position 15 mm from each end for reinforcement.

A golf club having such a head hits 3000 balls at a speed of 50 m / s.
It was found that there was no abnormality in the head and no problem in strength.

The following table shows the evaluation results when golf clubs having a head made of a magnesium alloy having the above-mentioned size were actually hit by 12 professional golfers, 6 assistant professional golfers, and 11 amateur golfers. Show.

[0013]

[Table 1]

From Table 1, the ratio of good evaluation is about 60 to 70.
%, The average rating was about 20 to 30%, and the poor rating was about 10 to 20%, indicating that most golfers who hit the ball were satisfied.

[0015] An actual hit test was carried out to obtain a specific strength of 140.
Since the head was formed with the above magnesium alloy,
The head volume can be 250 cc or more to more than 300 cc. It has been found that the golfer enlarges the sweet area and feels easy to use when the sweet area is enlarged by 20% or more compared to the conventional art.
If it is less than 20%, the effect is not felt as real.

[0016]

As described above, according to the present invention, a head is formed using a magnesium alloy having a specific strength of 140 or more as a material for forming the face surface and a head forming material excluding the face surface. Maximum height is 4
8mm or more, the shaft reference head length is 86mm or more, and the maximum head width is 85mm or more. The trajectory stability in the left-right direction of the ball can be improved while minimizing it. In addition, the entire head can be enlarged without any problem in strength. Further, a lower center of gravity and an improved moment of inertia can be achieved by allocating the peripheral weight by the thickness of the head.

[Brief description of the drawings]

FIG. 1 is a front view of a golf club head according to the present invention.

FIG. 2 is a side view.

[Explanation of symbols]

 1 face side 2 shaft

Continuation of the front page (56) References JP-A-4-12772 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A63B 53/00-53/16

Claims (1)

(57) [Claims] 1. A golf club head having a sole width equal to or greater than a face height, wherein the head is formed using a magnesium alloy having a specific strength of 140 or more as a material for forming the face surface and a head forming material excluding the face surface. A golf club head having a maximum face height of 48 mm or more on a face surface, a standard shaft length of 86 mm or more, and a maximum head width of 85 mm or more.