JP2851542B2 - 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 wood type golf club head, and more particularly to a golf club head having a hollow head body formed of a metal material generally called metal wood.

[0002]

2. Description of the Related Art A head body is formed of a relatively light metal material such as titanium or an alloy thereof (specific gravity of about 4.5).
A so-called titanium head is known. If the head body is formed of such a relatively light metal material,
The head volume can be increased, and the sweet area can be expanded.

[0003]

However, even if a titanium alloy is used, the head volume is at most 260.
The limit is about cc. It (volume is about 260cc)
If it exceeds, the weight of the head itself becomes too heavy. Also, the adjustment (setting) of the position of the center of gravity of the head becomes difficult.

Accordingly, an object of the present invention is to provide a golf club which has a sweet area larger than that of a titanium head, does not become too heavy in the head weight, and can easily adjust the position of the center of gravity.

[0005]

Means for Solving the Problems] To achieve the above object, in the present invention, wood-based golf club head having a hollow formed in the magnesium alloy, of the head
The thickness of the striking surface is 5 to 7 mm.
The thickness of each part reaching the round part is 1.2 to 2.5 mm,
Make the crown part the thinnest within the above range.
Forming a head volume in the range of 200~350cc by the
On the other hand , by providing a weight inside the head , the head weight is 130 to 210 g, the moment of inertia around the X axis is 17 g · mm · S ² or more, and the moment of inertia around the Y axis is 28 g · mm · are those set in the S ² or more.

[0006]

[Action] Wood system formed hollow with magnesium alloy
Golf club head, the thickness of the hitting surface of the head
5-7mm, from the sole to the crown via the side wall
The thickness of each part is 1.2 to 2.5 mm, but the crown
While forming the f <br/> head volume in the range of 200~350cc by thinnest within the above numbers, f
By providing a weight inside the head , the head weight can be reduced to 13
0 to 210 g, moment of inertia around the X axis is 17 g
mm ・ S ² or more, the moment of inertia around the Y axis is 28g ・
Having set mm · S ² or more, that increased the sweet area, suppressing an increase in head weight, adjustment of the gravity center position is also easy. The weight provided inside the head body is
Functions for adjusting the moment of inertia and the position of the center of gravity of the head
I do.

[0007]

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 wood type golf club head having a hollow head body 1 formed of a metal material.
The hosel part 2 for shaft connection connected to the head main body 1 is not included in the head main body 1 here. In some golf club heads, the hosel portion 2 does not exist, and a shaft is directly inserted into the head main body 1 and attached.
The head body 1 has a striking surface 11, a sole portion 12, and a crown portion 13. In this embodiment, a portion other than the crown portion 13 is manufactured by casting or forging.
3 is attached by means such as welding by post-processing. In this embodiment, the entire head body 1 is formed of a magnesium alloy. The thickness of the striking surface 11 should be 5-7 mm or more,
The thickness of the sole portion 12 is 1.5 mm or more, and the crown portion 1
No. 3 was formed thinnest. In this embodiment, the hosel portion 2 is formed of a magnesium alloy similarly to the head body 1.
An axis perpendicular to the center of gravity G of such a head body 1 is defined as a Y axis, an axis perpendicular to the Y axis is defined as a Z axis, and an axis parallel to the striking surface 11 and extending through the plane of the drawing is defined as an X axis. If X
The moment of inertia around the axis is 17 g · mm · S ² or more, and the moment of inertia around the Y axis is 28 g · mm · S ² or more. The reason for setting the moment of inertia in this way is to make the flight direction stable and reduce the flight distance when the ball is hit with the center removed. If the moment of inertia around the X axis is less than the above value or the moment of inertia around the Y axis is less than the above value, the flying direction becomes unstable when the ball is hit off the center,
No flight distance. By reducing the thickness of the crown portion 13 and reducing the weight, the center of gravity of the head main body 1 can be reduced.
In addition, the sole portion 12 and the crown portion 1
The thickness of the side wall portion 14 following 3 is set to 1.2 to 2.5 mm, and the thickness of the crown portion 13 is set to be the thinnest within the range of the above numerical values. In the embodiment shown in FIG. 1, since the hosel portion 2 and the head main body 1 are formed of a magnesium alloy by a lost wax method or the like, the specific gravity is small, the head volume can be formed to 200 to 350 cc, and the sweet area can be reduced. Expansion is possible. Even if the head volume is 200 to 350 cc, the head weight is 130
It is in the range of up to 210 g.

In another embodiment shown in FIG. 2, a rib 3 is formed inside a hollow head body 1 and a weight 4 is provided. A plurality of ribs 3 are formed from the back side of the striking surface 11 to the sole portion 12. The presence of these ribs 3 increases the strength of the striking surface 11. A hole 5 is formed in the upper surface of the head main body 1, and this hole 5
3 and integrated by means such as welding. FIG. 3 is a view as seen from above before the crown portion 13 is fitted. A plurality of claws 6 for mounting the crown portion 13 are formed at the holes 5. The weight 4 is provided for adjusting the moment of inertia around the X axis and the position of the center of gravity of the head. The weight 4 may be formed of a material other than a magnesium alloy, or may be the same material. Here, the magnesium alloy refers to an alloy having a magnesium content of more than 50%. Besides magnesium, Al, Zn, Mn, Zr, Si, Cu,
Other metal components such as Ni may be included. Magnesium alloys that can be suitably used include MC in the JIS symbol.
2 and MC3 can be suitably used.

[0010] Since magnesium alloy specific gravity is smaller than that of many other metals, the head whole be formed, it is possible to increase the head volume without causing excess weight using this. Further, since the head itself made of a magnesium alloy is relatively lightweight, the weight member can be arranged at a desired position inside the head, for example, as in the embodiment shown in FIG. Therefore, it is possible to easily set the position of the center of gravity of the head (the height of the center of gravity, the depth of the center of gravity, etc.) (the degree of freedom in head design is increased). When manufacturing the golf club head of the present invention, it is preferable to apply an appropriate heat treatment to the head base material made of a magnesium alloy to increase the tensile strength and the hardness. As the heat treatment, specifically, a heat treatment represented by T5 and T6 in a JIS standard symbol is preferable. Further, it is preferable that the head base material made of a magnesium alloy is subjected to a known rust preventive treatment in advance, and further coated with an epoxy-based or urethane-based paint.

[0011]

As described above, according to the present invention, a golf club head of wood system formed to be hollow magnesium alloy <br/>, 5 to 7 mm the thickness of the striking face of the head, sole portion
The thickness of each part from the surface to the crown through the side wall is 1.
2 to 2.5 mm, provided that the crown is within the above range
And the thinnest, the head volume is 200 to 3
A weight is provided inside the head while forming it in the range of 50cc
As a result, the head weight was set to 130 to 210 g, the moment of inertia around the X axis was set to 17 g · mm · S ² or more, and the moment of inertia around the Y axis was set to 28 g · mm · S ² or more. The sweet area can be expanded by increasing the head volume without increasing the weight. Also,
Adjustment of the position of the center of gravity of the head is also facilitated. Further, the moment of inertia can be increased, and loss of directionality and flight distance is small even when the ball is hit off the center.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment.

FIG. 3 is a plan view of FIG. 2 excluding a crown portion.

[Explanation of symbols]

 1 Head body 13 Crown part

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Eshi Saki ▼ Hiroshi 20 Onohara, Chichibu City, Saitama Prefecture Inside Bridgestone Sports Co., Ltd. (56) References JP-A-6-296714 (JP, A) (58) Survey Field (Int.Cl. ⁶ , DB name) A63B 53/04

Claims (1)

(57) [Claims] 1. A golf club head of a wood type which is hollowly formed of a magnesium alloy and has a hitting surface of the head having a thickness of 5 to 7 mm and a side from a sole portion.
The thickness of each part reaching the crown through the wall is 1.2 to
2.5mm, provided that the crown is within the above numerical range
The thinnest thickness allows for a head volume of 200 to 350
cc , while the weight of the head is reduced by providing a weight inside the head.
30-210g, 17g moment of inertia around the X axis
· Mm · S ² or more, the moment of inertia around the Y axis 28g
Golf club head, characterized in that it mm · set S ² or more.