JPH06304271A - Golf club head - Google Patents

Abstract

PURPOSE:To obtain a golf club head which possesses the excellent balance, secures the max. head speed and the increase of the flying distance. CONSTITUTION:On the inner peripheral surface of a shell 1 and/or on the inner surface of a sole part 2, a balancer 3 made of the metal material having a large specific gravity is added and/or the sole part 2 itself is made of the metal material having a large specific gravity.

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, and more particularly to a golf club head having a hollow portion (including one having a foamed resin or the like filled therein).

[0002]

2. Description of the Related Art Recently, golf club heads called so-called wood clubs have been made larger and lighter.
Improvements in the manufacturing method have made it possible to reduce the thickness of stainless steel materials while maintaining a certain level of strength, and the volume of more than 200cc has been developed. Further, a head volume further increased by using a titanium alloy or a magnesium alloy has been developed.

[0003]

If the head is thick, the volume is small and the moment of inertia is also small. In order to increase the moment of inertia, it is necessary to increase the head volume. Therefore, conventionally, the wall thickness has been reduced to increase the size of the head. However, the conventional head, in which the wall thickness of the head is reduced to increase the size thereof, is also intended to be lightweight.
If the head weight is not appropriate, the flight distance will not increase, and if it is too light, the balance will be poor and the head speed will be difficult to obtain.

Therefore, the present invention provides a golf club head in which a metal material having a large specific gravity is added to a head which is large and lightweight to obtain a well-balanced, maximum head speed and an increased flight distance. The purpose is to do.

[0005]

In order to achieve the above-mentioned object, the present invention forms a hollow shell having an open bottom from a metal material, and welds or forms a sole portion made of the metal material at the opening of the shell. In a golf club head formed by fitting or the like, at least the shell is formed of a metal material having a small specific gravity, and a balancer made of a metal material having a large specific gravity is added to the inner peripheral surface of the shell and / or the inner surface of the sole portion, or / and The sole portion itself is made of a metal material having a large specific gravity.

[0006]

In the present invention, the shell is formed of a metal material having a small specific gravity such as a titanium alloy, a magnesium alloy, or an aluminum alloy, and the sole portion is made of a metal material having a large specific gravity in order to achieve a low center of gravity. A balancer made of a material having a large specific gravity is added to the inner surface. To increase the moment of inertia, add a balancer on the toe side.
Alternatively, the depth of the center of gravity can be increased by adding a balancer to the rear side of the head.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, the specific gravity is 1.8.
A hollow shell 1 having an open bottom is formed from a magnesium alloy of ˜2.0, and a sole portion 2 also made of a magnesium alloy is welded to the opening of the shell 1. A thick portion 1A is formed on the rear side of the shell 1. Further, on the inner peripheral surface of the shell 1, a balancer 3 made of a metal material having a larger specific gravity than the shell 1, for example, brass, copper alloy, or Bi—Sn alloy having a small heat shrinkage is provided.
This balancer 3 is also provided on the rear side of the shell 1. In the head configured as shown in FIG. 1, the position of the center of gravity moves from the face surface to the rear side, and the depth of the center of gravity becomes deep. Since the moment of inertia increases as the depth of the center of gravity increases, the directional stability of the ball improves. In general, a head made of a stainless material or the like has a hollow interior, so that the face surface needs to have a certain thickness, so that the depth of the center of gravity becomes shallow. However, in the case where the shell 1 and the sole portion 2 are formed of a magnesium alloy, it is possible to reduce the thickness while maintaining the strength and increase the head volume. When the head is made of only magnesium alloy, the weight of the head is about 130 g, and the weight is insufficient and it becomes difficult to balance the head. A golf club called a driver has a well-balanced head weight of about 200 g and leads to an increase in flight distance. Therefore, the weight of the entire head is set to about 200 g by the balancer 3 and the thick portion 1A. When the center of gravity is low, the metal material forming the sole portion 2 has a large specific gravity. Alternatively, the balancer 3 is added to the inner surface of the sole portion 2.

The head shown in FIG. 2 is provided with a balancer 3 on the toe side. The moment of inertia is increased so that even if the ball is hit close to the toe, the head shakes little and a ball with stable directionality can be hit. It is configured as follows. Also in this case, the metal material forming the balancer 3 has a larger specific gravity than the metal material forming the shell 1. As the metal material forming the shell 1, one having a specific gravity of about 1.5 to 5.0 is selected. The metal material forming the balancer 3 or the sole portion 2 preferably has a specific gravity of 7.0 or more. To distribute the peripheral weight, the balancer 3 is added to the inner peripheral surface of the shell 1 excluding the face surface.

In each of the illustrated embodiments, the head of a golf club called a so-called wood club is shown. However, in recent iron clubs, particularly clubs called long irons, those having a hollow interior like a wood club are also available. The present invention can be applied to the head of such a club. The hollow portion of the shell 1 may be filled with foamed resin or the like. The balancer 3 of the present invention is not added to the outside of the head like the conventional Persimmon head or carbon head, but is added to the inside.

[0011]

As described above, according to the present invention, a hollow shell having an open bottom is formed from a metal material, and a sole portion made of a metal material is welded or fitted to the opening of the shell. Or at least a shell made of a metal material having a low specific gravity, and a balancer made of a metal material having a high specific gravity is added to the inner peripheral surface of the shell and / or the inner surface of the sole portion.
Since the sole portion itself is made of a metal material having a large specific gravity, the position of the center of gravity can be freely moved. The fact that the center of gravity can be freely moved means that the position of the center of gravity, the moment of inertia, and the depth of the center of gravity can be freely designed to suit each golfer. as a result,
The balance is good, the maximum head speed is obtained, and the flight distance can be increased.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing another embodiment.

[Explanation of symbols]

 1 shell 2 sole part 3 balancer

Claims (1)

[Claims] 1. A golf club head comprising a hollow shell formed of a metal material, the bottom of which is open at the bottom, and a sole portion made of the metal material being welded or fitted at the opening of the shell. A balancer made of a metal material having a large specific gravity is added to the inner peripheral surface of the shell or / and an inner surface of the sole portion, or / and the sole portion itself is made of a metal material having a large specific gravity. Golf club head to do.