JPH11114109A - Iron head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron head capable of improving a ball striking feel while taking advantage of a cavity back structure and further lowering of the center of gravity. SOLUTION: In an iron head 1 with a recess part 3 formed in its back, a through groove 8 communicated with the recess part 3 from a bottom face 7a is formed in the sole wall part 7 of a head main body 2, and a weight member 5 having a greater specific gravity than the head main body 2 is fitted into the through groove 8 and projected into the recess part 3, this projecting part 9 being pressed against the back 4a of a face wall part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an iron head.

[0002]

2. Description of the Related Art Conventionally, there has been known an iron head having a structure in which a concave portion is formed on the back side of the head (a so-called cavity back structure). In the head with this structure, a bottomed groove is formed in the sole wall from the bottom side, and a weight member of dissimilar metal having a higher specific gravity than the head body is press-fitted into this bottomed groove. In addition, there is one that lowers the center of gravity.

In the head having this structure, the thickness of the center portion (ball hitting portion) of the face wall portion is larger than that of a head having a structure in which no concave portion is formed on the back side of the head (so-called flat back structure). Since it was thin, it was possible to increase the head size and increase the moment of inertia.

[0004]

However, on the other hand, since the thickness of the hitting portion is thin, the feeling of hitting is deteriorated compared to the head having a flat back structure, and the vibration at the time of hitting the ball affects the hand. Sometimes it became easier. In addition, the rebound of the ball became worse, and the flight distance tended to be inferior.

Accordingly, the present invention solves such a conventional problem and can improve the feel at impact while making use of the advantages of the cavity back structure, and can further reduce the center of gravity. It is an object to provide an improved iron head.

[0006]

In order to achieve the above object, a golf club head according to the present invention provides an iron head having a concave portion formed on the back surface of a head, wherein the iron club head has a sole wall portion of a head body from a bottom surface side. A through groove communicating with the concave portion is formed, and a weight member having a higher specific gravity than the head main body is fitted into the through groove to project into the concave portion, and the projecting portion is formed on the back surface of the face wall portion. It is configured to be pressed.

[0007] Further, even when the weight member has a wedge-shaped cross-sectional shape whose diameter is reduced upward, the area of the projecting portion of the weight member is reduced to about 3 times the area of the back surface of the face wall portion exposed to the concave portion.
% To about 50%.

[0008]

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

FIGS. 1 to 3 show an embodiment of an iron head according to the present invention. This head 1 is an iron head having a recess 3 formed on the back side of the head (a so-called iron head having a so-called cavity back structure). In addition, the thickness of the center portion of the face wall portion 4 which is the hitting surface portion is set to be thin.

The head 1 is composed of a head body 2
And a weight member 5 fixed to the head body 2;
The head body 2 is integrally formed with a neck portion 6 for connection to a golf club shaft (not shown).

More specifically, the head body 2
Is made of pure titanium, a titanium alloy, or the like, has a recessed portion 3 on the back surface 4a side of the face wall portion 4, and communicates with the recessed portion 3 from the bottom surface 7a side of the sole wall portion 7. Groove 8
Is formed.

The weight member 5 is made of a dissimilar metal, such as aluminum bronze, bronze, tungsten, or steel, having a higher specific gravity than the head main body 2, and has a wedge-shaped cross section whose diameter is reduced upward. The cross-sectional shape is
It refers to a cross-sectional shape obtained when cut in a vertical direction on a plane orthogonal to the face wall portion 4.

That is, the head 1 is inserted into the through groove 8 of the head body 2 from the bottom surface 7a side of the sole wall portion 7 by the weight member 5
Are fitted into each other so as to protrude into the concave portion 3.
Is pressed against the back surface 4 a of the face wall portion 4.

Further, since the weight member 5 has a wedge-shaped cross-section, the weight member 5 is attached to the bottom surface 7a.
When press-fitting from the side, it can be more firmly fixed to the head main body 2. In addition, since the projecting portion 9 serves as a backup portion at the center lower side of the face wall portion 4 which is a thinly set hitting ball portion, the projecting portion 9 reinforces the hitting ball portion from the back and reduces vibration at the time of hitting. It is difficult to reach the hand, and the shot feeling is good.

The weight member 5 is connected to the head main body 2.
To the through groove 8 (and the back surface 4a of the face wall) with an adhesive. The area of the protruding portion 9 of the weight member 5 is set to be about 3% to about 50% of the area of the back surface 4a of the face wall portion 4 exposed to the concave portion 3. That is, when the area of the projecting portion 9 is less than 3%, the effect of reinforcing the hitting portion is small, and further lowering of the center of gravity is not achieved. On the other hand, if it exceeds about 50%, the advantage as the cavity back structure is lost and the weight of the head increases.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments 1 and 2 having the shape shown in FIGS. 1 to 3 wherein the head body 2 is made of titanium and the weight member 5 is made of aluminum bronze.
Comparative Example 1 which is the same material as the head a in which the weight member w is fitted into the bottomed (blind) groove b of the sole wall s as shown in FIGS. Produced. In addition, Example 1 and Comparative Example 1 were both 3 irons. Table 1 shows the height of the center of gravity of each of these heads 1 and a from the ground. The area of the projecting portion 9 of the weight member 5 in Example 1 was set to about 28% of the back surface 4a.

[0017]

[Table 1]

As shown in Table 1, it was found that the center of gravity of Example 1 was lower than that of Comparative Example 1. In other words, by further projecting the weight member 5 into the recess 3 to form the protruding portion 9, it is possible to further lower the center of gravity.

Next, the golf club of Example 1 and the golf club of Comparative Example 1 were produced using these heads 1 and a. In making each of the clubs, the same specifications were used for all the head specifications, shafts, grips, and the like.

Then, an actual hitting performance test was performed on each of these clubs by a swing robot. Table 2 shows the test results.

In this performance test, the head speed at the time of hitting was set to 38 m / sec, and a two-piece ball was actually hit at the center of the face surface. (Head speed / ball speed), launch angle, backspin amount, and distance (total) to the ball stop point.

[0022]

[Table 2]

From the test results shown in Table 2, it can be seen that the ball rebound of Example 1 is better than that of Comparative Example 1. In other words, it has been found that even with the same head material, when the structure is as shown in FIGS. 1 to 3, it is possible to improve the rebound of the ball.

Further, from the results of Tables 1 and 2, the club of Example 1 has a lower center of gravity than the club of Comparative Example 1, so that the ball can be easily lifted (launch angle is large). , And the backspin amount has been reduced,
The flight distance can be improved.

Next, the comparative example 1 described above was given to ten golfers.
Was actually hit with the golf club of Example 1, and a comparison test of shot feeling was performed. Table 3 shows the results.

[0026]

[Table 3]

As shown in Table 3, the majority of golfers felt that the golf club of Example 1 had a better shot feeling than the golf club of Comparative Example 1.

[0028]

The present invention has remarkable effects as described below.

According to the first aspect, it is possible to manufacture the head 1 having a lower center of gravity than the conventional head in which the weight member 5 is fitted only to the sole wall 7. In comparison, the ball was easier to lift and the flight distance was longer.

Further, since the projecting portion 9 serves as a backup portion (reinforcing portion) at the central portion (ball hitting portion) of the face wall portion 4, it serves to reinforce a thin ball hitting portion, thereby increasing durability. Also,
The rebound of the ball also improves. Further, when hitting a ball (especially when a missed shot is made), vibration is less likely to be heard in the hand, and the shot feeling is improved.

According to the second aspect, since the weight member 5 is firmly fixed to the head main body 2, the weight member 5
Is less likely to come off, the durability can be further improved, and the reinforcing force from the back surface 4a of the face wall portion 4 can be increased.

According to the third aspect, the center of gravity can be further reduced as compared with the conventional head. In addition, projecting part 9
Is the backup part (reinforcement part) of the ball striking part,
Conventionally, it has become possible to eliminate the disadvantages of a head having a cavity back structure. That is, the area of the projecting portion 9 is
If it is less than 3%, the effect of reinforcing the hitting portion is small, and
It is difficult to further achieve the purpose of lowering the center of gravity. On the other hand, about 50
%, There is no meaning as a cavity back structure and the head weight increases.

[Brief description of the drawings]

FIG. 1 is a rear view showing an embodiment of the present invention.

FIG. 2 is a bottom view thereof.

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIG. 4 is a rear view showing a conventional example.

FIG. 5 is a sectional view taken along line YY of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head 2 Head main body 3 Concave recess part 4 Face wall part 4a Back surface 5 Weight member 7 Sole wall part 7a Bottom surface 8 Through groove 9 Projection part

Claims (3)

[Claims] 1. In an iron head 1 having a recess 3 formed on the back side of the head, a through groove 8 communicating with the recess 3 from the bottom surface 7a side is formed in a sole wall 7 of the head main body 2, A weight member 5 having a higher specific gravity than the head body 2 is fitted into the through groove 8 so as to protrude into the concave recess 3, and the protruding portion 9 is crimped to the back surface 4 a of the face wall portion 4. Iron head characterized by doing. 2. The iron head according to claim 1, wherein the weight member has a wedge-shaped cross-sectional shape whose diameter is reduced upward. 3. The area of the projecting portion 9 of the weight member 5 is
3. The iron head according to claim 1, wherein the area of the back surface 4 a of the face wall portion 4 exposed to the concave portion 3 is set to about 3% to about 50%.