JPH10248971A - Iron club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a beginner to easily hit a ball upward with easier contact thereof by arranging an iron head to comprise the body of a head having a hollow part and a face insert fitted into a recess part of the head body. SOLUTION: In this iron head 1, a face insert 4 is mounted on a face surface 3 of the body 2 of the head and a hollow part 5 is arranged inside the head body 2. In this case, a recess part 6 is formed for mounting the face insert in the face surface 3 of the head body 2. The recess part 6 has a bottom surface part 6a formed adjacent to the hollow part 5 and a through part 6c formed in the bottom surface part 6a while a side part 6b of the recess part 6 is formed vertical. Moreover, an opening part is formed at the central part of the rear part of the head body 2 to let the hollow part 5 communicate with outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an iron club head (hereinafter simply abbreviated as "iron head") comprising a head body having a hollow portion and a face insert fitted into a recess of the head body. is there.

[0002]

2. Description of the Related Art Conventionally, in golf play,
Various golf club heads have been invented for the purpose of accurately increasing the flight distance of a golf ball. Especially,
Also in the iron head, for example, an iron head called a cavity iron type has become mainstream in order to improve the flight distance of a golf ball like a wood club head. For example, a very common form is an iron head in which the shape of the back portion of the head main body is made thinner and concave at the central portion than the outer peripheral portion, and is lighter than the specific gravity of the head main body in the concave portion of the face surface. An iron head in which a face insert is fitted and attached is known. In other words, by reducing the thickness of the lightweight face insert and the central portion of the head main body, the weight distribution of the head main body is mainly placed on the outer peripheral portion, thereby increasing the sweet area and increasing the thickness of the central portion. By reducing the thickness of the golf ball, the face portion bends to improve the resilience of the golf ball when hit.

As shown in FIG. 5, an opening 14 is provided in a recess 13 formed in the face surface of the head body 12.
An iron head 11 in which a face insert 15 made of a different material having a smaller specific gravity than the head body 12 is fitted is also known.

[0004] Further, as in an iron head 11 shown in FIG. It is also known that an opening 16A is formed to improve the controllability of the golf ball by acquiring torsional resistance when the golf ball is hit and transmitting momentum to the golf ball during a stroke with delay. is there.

[0005] In addition, recently, Japanese Patent Laid-Open No.
7, a back opening 16A having a hollow portion 17 in a head body 12 and opening a central portion of a back portion 16 of the head body 12 to the outside like an iron head 11 shown in FIG. And the thickness of the face is set to 3 mm or less, and the face is
An iron head 11 made of a high-strength material having a bending strength of not less than / mm ² is also known.

[0006]

However, these conventional iron heads have the following problems. That is, in the former cavity-type iron head, the thickness of the central portion is smaller than the outer peripheral portion of the head main body, so that the iron head has a concave shape,
Certainly, the weight distribution to the periphery of the head body improves the sweet spot, but the depth of the center of gravity of the head body is shallower and closer to the face, so that when used by a beginner, the launch angle of the golf ball decreases. There was a strong tendency, and it was rather an iron head for intermediate and advanced players.

Next, in the latter cavity type iron head, an opening is provided in a concave portion formed in the face portion, and a face insert made of a different material having a specific gravity smaller than that of the head body is fitted and inserted. By forming the opening, the weight can be distributed further to the periphery of the head main body, so the sweet spot expands, but this iron head also tends to have a shallower center of gravity, so it is more suitable for beginners It was an iron head for advanced users.

Further, as in an iron head disclosed in Japanese Patent Application Laid-Open No. 6-86842, a counterbore portion is formed behind the face surface of the head body, and when a golf ball is hit, the face surface is twisted by a bending action. An iron head that controls a golf ball by obtaining resistance and transmitting momentum to a golf ball during a stroke with a delay transmits an effect if the head body and the face surface are integrally formed of the same material. However, when a face insert made of another material is fitted to the face surface, there is a possibility that a gap, peeling, crack, or the like due to repeated stress may occur on the fitting joint surface between the face insert and the head body.

Further, as disclosed in Japanese Patent Application Laid-Open No. 8-168541, a back opening having a hollow portion in the head body and opening a central portion of the back portion of the head body to the outside is formed. In addition, the thickness of the face surface is set to 3 mm or less, and in the iron head in which the face surface is formed of a high-strength material having a bending strength of 120 kgf / mm ² or more, the thickness of the face surface is set to 3 mm or less. Therefore, when the golf ball is hit, the face insert bends and the resilience to the golf ball improves, but when the face insert is fitted to the face surface, the face insert becomes too flexible and the face There is a possibility that a gap, peeling, cracking, or the like may occur in the fitting joint surface between the insert and the head body. Therefore, in the cavity type iron head, while improving the controllability and resilience characteristics of the golf ball, expanding the sweet area by distributing the weight around the head body and setting the depth of the center of gravity further behind, the golf ball rises for beginners It is easy for intermediate and advanced players to have an iron head that can improve the flight distance.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. That is, a face insert is mounted on the face surface of the head body of the iron head, and in an iron head having a hollow portion inside the head body, the face surface of the head body includes:
A concave portion for mounting the face insert is formed, the concave portion has a bottom portion adjacent to the hollow portion, a through portion is formed on the bottom portion, and the side portion of the concave portion is formed in a vertical shape, and further, the head An iron head, characterized in that an opening through which the hollow portion communicates with the outside is formed in the center of the rear portion of the main body. Further, the area of the penetrating portion formed on the bottom surface of the concave portion for mounting the face insert of the head body can be formed to be 20 to 55% of the area ratio of the entire bottom surface.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the invention according to claim 1 of the present invention, a separately formed face insert is mounted on the face surface of a head body of an iron head, and the inside of the head body is provided. In an iron head having a hollow portion, a concave portion for mounting a face insert is formed on a face surface of the head body, and the concave portion has a bottom portion adjacent to the hollow portion and a through portion formed on the bottom portion. In addition, the side surface of the concave portion is formed in a vertical shape, and an opening through which the hollow portion communicates with the outside is formed in the center of the back surface of the head main body. Thus, the concave portion for mounting the face insert is formed, and the concave portion has a bottom portion adjacent to the hollow portion and a structure in which a through portion is formed on the bottom portion,
Since the penetrating portion is formed to such an extent that the rigidity of the bottom portion is not impaired even against repeated stress due to hitting, the face insert is held by the bottom portion, and a face insert made of a material different from that of the head body is fitted. Even when used with mating and insertion, since the face surface can be prevented from bending while maintaining rigidity against the stress at the time of hitting, there is no gap, peeling or crack on the mating joint surface between the head body and the face insert. This can be prevented from occurring. Further, if the area of the through-hole formed on the bottom surface of the recess for mounting the face insert is formed to be 20 to 55% of the area ratio of the entire bottom surface, the rigidity of the bottom surface is not impaired. The extra weight can be removed and the corresponding weight can be placed on the back or periphery of the head body, expanding the sweet area, increasing the depth of the center of gravity, increasing the launch angle of the golf ball, and increasing the flight distance and direction. Can improve the performance.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, a face insert 4 is mounted on a face surface 3 of a head main body 2, and a hollow inside the head main body 2. In the iron head 1 having the portion 5, a recess 6 for mounting a face insert is formed on the face surface 3 of the head body 2, and the recess 6 has a bottom portion 6 a adjacent to the hollow portion 5 and a bottom portion 6 a. Penetration 6c
Are formed, and the side surface portion 6b of the concave portion 6 is formed in a vertical shape, and further, the central portion 7a of the back surface portion 7 of the head main body 2 is formed.
The iron head 1 has an opening 7b through which the hollow portion 5 communicates with the outside.

In the present invention, for example, the thickness of the face insert 4 mounted on the face surface 3 of the head main body 2 is set in the range of 1.5 to 3.0 mm, and the face insert 4 is formed on the face surface 3. The thickness of the bottom surface 6a of the recess 6 is set in the range of 0.8 to 2.5 mm (the optimal value is 2 to 2.
5 mm), and the thickness of the back surface 7 where the opening 7b of the head main body 2 is formed is set in the range of 1.5 to 3.0 mm (optimum value is 2 to 2.8 mm). The interval between the soles of the central hollow portion 5 is set in a range of 8 mm or less (optimum value is 5 to 7 mm), and the interval between the soles on the toe side of the hollow portion 5 is set in a range of 4 to 9 mm (optimum value is 5 mm). ~ 8m
m) can be done. Further, the area of the through portion 6c provided on the bottom surface 6a of the recess 6 for mounting the face insert of the head body 2 is set to be 20 to 20 of the area ratio of the entire bottom surface.
It can also be formed to be 55% (optimum value is 25 to 35%).

Further, one embodiment of the present invention will be described in detail. For example, the head body 2 is made of steel, alloy steel, stainless steel, or the like.
The head body 2 can be appropriately selected from metal materials such as carbon steel, copper, copper alloy, beryllium copper alloy, pure titanium, and titanium alloy. In addition, the head body 2 should be formed by a lost wax casting method or a forging method. Can be done. The face insert 4 is appropriately selected from metal materials such as amorphous alloy, steel, alloy steel, stainless steel, carbon steel, pure titanium, titanium alloy, aluminum, aluminum alloy, copper, copper alloy, and beryllium copper alloy. Can be combined. Preferably, the head main body 2 can be formed by a precision casting method using stainless steel SUS630 or the like.

Further, by disposing and combining different kinds of metal materials having a lower specific gravity than the head main body 2 as face inserts, the distribution of weight existing on the face surface of the head main body 2 can be reduced. In addition to the above, the moment of inertia of the head itself is increased, the sweet spot is widened, and an opening 7b through which the hollow portion 5 communicates with the outside is formed in the central portion 7a of the back portion 7 of the head main body 2. As a result, the weight existing in the opening 7b can be arranged in the periphery of the back surface portion 7 of the head main body 2, so that the depth of the center of gravity of the head main body itself can be deepened, so that even a beginner can easily hit a golf ball and hit the golf club easily. Can be provided. When the face insert 4 made of an amorphous alloy or another material having a different specific gravity is used, the bottom portion 6
The optimum iron head can be supplied by increasing or decreasing the area of the penetrating portion 6c formed at the point a. Furthermore, by using pure titanium or a titanium alloy for the face insert 4, since these materials are lightweight and have high specific strength, it is possible to hit the ball easily with good separation from the ball. It is possible to provide a golf club suitable for a golfer.

In the present invention, the face insert 4 is formed vertically on the side face 6b of the concave portion 6 formed in the face surface 3 of the head body 2, so that the boundary with the face insert 4 is vertically joined. The joint surfaces are beautifully continuous and are flush with each other, so that defects such as gaps and discontinuous wavy joint surfaces can be prevented.

In the present invention, the face insert 4 is formed on the face surface 3 of the head main body 2 by the recess 6.
As a method for bonding to the substrate, a method using an adhesive, a brazing method using silver brazing, or the like can be used.

[0018]

As described above, in the iron head of the present invention, the weight distribution of the head body is reduced by selecting and combining different kinds of metal materials having a lower specific gravity than the head body as the face insert. By being distributed to the peripheral portion, the moment of inertia of the head itself is increased, the sweet spot is widened, and an opening through which the hollow portion communicates with the outside is formed in the center portion of the back portion of the head body. Since the weight existing in the opening can be distributed to the rear and peripheral portions of the head main body, the depth of the center of gravity of the iron head itself can be deepened, and a golf club that is easy for a beginner to hit easily and can hit easily can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of fitting of a head body and a face insert of an iron head according to the present invention.

FIG. 2 is a perspective view showing one embodiment of an iron head according to the present invention.

FIG. 3 is a cross-sectional view of a main part of the head main body of the iron head according to the present invention, showing a cross section of an AA section, a BB section, and a CC section of FIG. 2;

FIG. 4 is a perspective view showing the back side of the head body of the iron head according to the present invention.

FIG. 5 is a sectional view of a main part showing a conventionally known iron head.

FIG. 6 is an essential part cross-sectional view showing a conventionally known iron head.

FIG. 7 is an essential part cross-sectional view showing a conventionally known iron head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron head 2 Head main body 3 Face surface 4 Face insert 5 Hollow part 6 Concave part 6a Bottom part 6b Side part 6c Hollow part side 6d Concave part 7 Back part 7a Central part 7b Opening 11 Iron head 12 Head main body 12A Face 13 Depressed part 14 Opening Part 15 Face insert 16 Back part 16A Back opening 17 Hollow part 18 Counterbore part

Claims (2)

[Claims] An iron club head having a face insert mounted on a face surface and having a hollow portion inside a head body, a recess for mounting the face insert is formed on the face surface of the head body. A bottom portion adjacent to the hollow portion and a penetrating portion formed in the bottom portion, the side portion of the concave portion is formed in a vertical shape, and the hollow portion is formed at the center of the back portion of the head main body. An iron club head, wherein an opening communicating with the iron club head is formed. 2. An area ratio of an area of a through-hole formed on a bottom surface of a recess for mounting a face insert of the head body is 20 to 55% of an area ratio of an entire surface of the bottom surface. Iron club head.