JP2001029521A - Iron golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heighten the moment of inertia of a head in the circumference of the center of gravity of the head, to lower the center of gravity, to obtain a stable sense of hitting by providing a back member at the back of a face surface, and to reinforce a plate-shaped face member. SOLUTION: In an iron golf club head, a plate-shaped face member 3 which forms a face surface is provided for an opening part 2 at the face surface location of a head body 1. A back member 4 is superposed on a part of the back surface of the face member 3 in such a way that the back member 4 and face member 3 are partially exposed to the back-surface side of the opening part 2 of the head body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron golf club head.

[0002]

2. Description of the Related Art As a prior art, a golf club head in which an opening is provided at a face surface portion of a head body and a face member is added to the opening is disclosed in Japanese Patent Laid-Open No. 6-205.
No. 858. Also, JP-A-8-3865
No. 7 discloses an iron golf club head in which a concave portion is provided on the back surface and a material having a low specific gravity is provided on the entire concave portion.

[0003]

In the prior art,
For example, when a golf ball is hit with a head in which the face member, which is the hitting surface plate described above, is attached to the opening of the head main body, the feeling of hitting is light, and it is unsatisfactory for an advanced player with a high head speed. There is also a problem that the ball striking plate is easily deformed.

[0004] In the case where a concave portion is provided on the back surface of the head, and a material having a low specific gravity is provided on the entire concave portion, the hitting feeling is firm and a high-speed head is satisfactory for the advanced golfer. Compared with the club head, there is a problem that the head area must be made smaller and the moment of inertia around the center of gravity of the head becomes smaller, so that the sweet area becomes smaller.

Accordingly, it is an object of the present invention to increase the head moment of inertia around the center of gravity of the head to reduce the center of gravity, and to provide a firm hit feeling by providing a back member behind the face surface. An object is to provide an iron golf club head capable of reinforcing a plate-like face member.

[0006]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides an iron golf club head having a plate-like face member for forming a face surface at an opening at a face surface portion of a head body. The back member is superposed on a part of the back surface of the face member so that the back member and a part of the face member are exposed behind the opening of the head body.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

In the center longitudinal section of the iron golf club head of the present invention shown in FIG. 1, a face member 3 for forming a face in an opening 2 at a face of a head body 1 is provided.
The back member 4 is superimposed on a part of the back surface 3A of the face member 3 so that the back member 4 and a part of the face member 3 are exposed behind the opening 2 of the head body 1. It is. In FIG. 1, reference numeral 5 denotes a hosel formed integrally with the head main body 1;
The shaft 6 is mounted on the.

The head body 1 is made of castable stainless steel (SU).
In step S630), a forgeable titanium alloy (SP700) was used as the face member 3, and a forgeable copper alloy was used as the back member. The face member 3 and the back member 4 were press-fitted into the opening 2 at the peripheral step 2A and attached to the head body 1.

FIG. 2 is a rear view of the head, in which the back member 4 is provided in such a size as to cover substantially the lower half of the back surface 3A of the face member 3. The head body 1 includes a toe side rib 1A,
Sole side rib 1B, heel side rib 1C, top side rib 1
D to form a cavity (recess) surrounded by the ribs 1A to 1D. The back member 4 is the head body 1
By using a copper alloy having a specific gravity of 8.2 for the back member 4,
The specific gravity is the largest among the head constituent members, and is provided below the head to reduce the center of gravity of the head. Further, the poor feeling of hitting of the head, which is called a so-called cavity iron, is improved by reinforcing the back side of the face member 3 with the back member 4. Particularly, by making the vicinity of the center of the back member 4 thicker than the toe side or the heel side, a firm feel can be obtained.

FIG. 3 shows another embodiment, in which the thickness of the face member 3 is 2.0 mm, the thickness of the back member 4 on the toe side and the heel side is 2.0 mm, and the maximum thickness near the center is shown. The thick part was 5.0 mm.

The head shown in FIG. 3 was used as an iron club having a loft angle of 21 °, and its function evaluation and test hit evaluation were performed.
The results were as shown in Tables 1 and 2 below.

[0013]

[Table 1]

The comparative product is a third iron of a cavity back type in which a face member is simply fitted into the opening of the head body, and the back member 4 is not provided. Table 2 below shows the test hit evaluation.

[0015]

[Table 2]

With the iron club of the present invention shown in Table 1, a very good evaluation (A) was obtained.

In the above-described embodiment, the head body 1 is made of stainless steel, but soft iron, copper alloy and the like can also be suitably used. The face member 3 is made of pure titanium,
Materials such as aluminum alloys and maraging steel can also be used. The face member 3 is desirably made of a high-strength material having a small specific gravity. Particularly, a forged material or a rolled material is preferable, and β titanium alloy, near β titanium alloy, SP700 material, aluminum beryllium alloy, aluminum scandium alloy, FRM, and the like can be suitably used. The thickness of the face member 3 is about 1.0 mm to 4.0 mm. In particular, 1.5 mm to 3.5 mm is preferable. If the thickness of the face member 3 is reduced, the strength is reduced and the face member 3 is easily deformed. Therefore, it is not preferable to reduce the thickness too much.
Since the weight increases, the size of the head becomes small, and the moment of inertia around the center of gravity of the head becomes small, which is not preferable. The face member 3 is a head body 1
When the head body 1 is fitted and fixed on the face side,
The joints can be made inconspicuous by arranging extremely small concave grooves continuously in the fitting portion between the head main body 1 and the face surface portion on the same plane as the face surface portion. The back member 4 is preferably made of a metal material, and an aluminum alloy, stainless steel, a copper alloy, a tungsten alloy, or the like can be suitably used. The thickness of the back member 4 is preferably in the range of about 0.8 mm to 10.0 mm for the purpose of reinforcing the face member 3 and providing a sense of sharpness. Further, unlike the face member 3 forming the face surface, it is not necessary that the surface is a uniform plane, and it is preferable that a portion at an actual hitting position is thick. In particular, it is preferable that the toe side and the heel side are formed thin and the center part is formed thick.
It is preferable that a portion of the back member 4 that comes into contact with the face member 3 be flat so as to be in close contact with the face member 3. The back member 4 preferably exists up to a position where the ball of the face member 3 hits. In the case of an iron head having a loft angle of 25 ° or less called a long iron, it is preferable to reduce the center of gravity, and Position it. When the center of gravity is to be increased by using a short iron, it can be provided on the upper half side of the face member 3 contrary to the illustrated embodiment.

In the above-described embodiment, the face member 3 is press-fitted and fixed to the step portion 2A of the opening 2. However, the face member 3 can be fixed to the head main body 1 by caulking, bonding, welding, or the like. The same applies to the attachment of the back member 4.

[0019]

As described above, according to the present invention, the back member is superimposed on a part of the back surface of the face member, and the back member and a part of the face member are exposed behind the opening of the head body. With this configuration, the moment of inertia around the center of gravity of the head can be increased, and a solid feel can be obtained by reinforcing the face member with the back member, making it possible to design the position of the center of gravity more easily. It is.

[Brief description of the drawings]

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

FIG. 2 is a rear view.

FIG. 3 is a sectional view showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head main body 2 Opening 3 Face member 3A Back surface 4 Back member

Claims (5)

[Claims] 1. An iron golf club head provided with a plate-like face member forming a face surface at an opening at a face surface portion of a head body, wherein the back member is overlapped on a part of the back surface of the face member. An iron golf club head characterized in that the back member and a part of the face member are exposed on the back side of the opening. 2. The iron golf club head according to claim 1, wherein at least the back member is located at the back of a central portion of the face member. 3. The iron golf club head according to claim 1, wherein the back member is overlapped below a back surface of the face member. 4. The iron golf club head according to claim 1, wherein the face member and the back member are formed of different materials. 5. The back member has a length from the toe side to the heel side of the opening of the head body, and the thickness of the central portion of the back member is formed larger than the thickness of the toe side and the heel side. The iron golf club head according to any one of claims 1 to 4, wherein: