JP2002143356A - Iron golf club head and iron golf club set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a carry of a hitting ball by increasing resiliency of a face surface while securing a degree of freedom of design of a head, to lower the center of gravity of the head, and to firmly fix a weight member to a sole part. SOLUTION: This iron golf club head is provided with a plate-like face member 2 having the face surface 2a, a back face member 3 having the thick sole part 33, joined to the back face side of the face member 2, and forming a hollow part 6 between the back face member 3 and a back face 2b of the face member 2, and a weight member 5 composed of a weight body 51 and a projecting part 52 inserted into the sole part 33 and having a specific gravity larger than the face member 2 and the back face member 3. The projecting part 52 is fitted in a through-hole 33b formed in the sole part 33, and is fixed to the through-hole 33b by being collapsed and plastically deformed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an iron golf club head and an iron golf club set.
In particular, it relates to improvement of the head portion.

[0002]

2. Description of the Related Art In recent years, in iron golf club heads, the peripheral portion of the head is thinner than a so-called plain back iron in which the back side of the head is gradually thinned from the sole portion to the top edge portion. A so-called cavity back iron, in which the thickness is increased to make the peripheral portion heavier and a cavity is formed on the back side of the head, is becoming the mainstream.

[0003] This is because the cavity back iron has a higher degree of directional stability against variations in hit points, and the weight is added to the sole portion so that the head can have a lower center of gravity. It is because it becomes easy to go up and it becomes possible to gain a flight distance.

However, in the conventional cavity back iron, the thick sole portion is formed integrally with the face surface, so that the deflection of the face surface is suppressed by the sole portion at the moment of impact of the ball, As a result, there has been a problem that the repulsive force of the face surface is reduced and the flight distance of the hit ball is reduced.

Therefore, in order to solve such a problem,
Conventionally, the head portion has been improved. For example,
In the iron golf club head described in JP-A-11-104283, as shown in FIG. 10, a slit 102 is formed between a sole portion 100 and a face surface 101 and an elastic body 103 is filled in the slit. By doing so, the area for restraining the face surface 101 is reduced,
The flight distance of the hit ball is improved.

[0006] Further, as disclosed in Japanese Unexamined Patent Application Publication No. 11-244430, as shown in FIG.
By forming the undercut portion 103 at 00,
The area for restraining the face surface 101 is reduced, and the flight distance of the hit ball is similarly improved.

However, in the method disclosed in each of the above publications, since a head having a sole portion and a face surface integrally formed or processed, the shape of the slit or the undercut is reduced for molding or processing reasons. Has the disadvantage that the degree of freedom of design is limited.

On the other hand, in recent iron golf club heads, a metal having a low specific gravity such as titanium or a titanium alloy has been adopted as a head material. However, in the case of a head made of such a metal, since the specific gravity of the material is small even when the sole portion is formed thick, there is a limit in weight distribution of the entire head.

In view of the above, various proposals have been made to reduce the center of gravity of the head by disposing a weight member made of a metal having a large specific gravity on the sole portion. However, many of these have a disadvantage that the weight member is fitted into the sole portion by press-fitting, so that the material constituting the weight member is limited, and the degree of plastic deformation inside cannot be easily confirmed from the outside. there were.

The present invention has been made in view of such a conventional situation, and has a high degree of freedom in head design.
An object of the present invention is to provide an iron golf club head having a cavity back structure or an iron golf club set including the same, which can increase the repulsive force of the face surface, improve the flight distance of a hit ball, and reduce the center of gravity of the head. This is the purpose of 1. A second object of the present invention is to
Another object is to enable the weight member to be firmly fixed to the sole portion.

[0011]

An iron golf club head according to a first aspect of the present invention is an iron golf club head having a cavity back structure having a cavity on the back side of the head, wherein the plate-like face member has a face surface. A back face member having a thick sole portion, joined to the back side of the face member, and forming a hollow portion with the back surface of the face member;
A weight member inserted into the sole portion and made of metal having a specific gravity greater than that of the face member and the back face member. The weight member includes a weight main body and a protruding portion protruding therefrom. The sole portion has a through hole into which at least the projecting portion of the weight member is fitted, and the projecting portion is fixed to the through hole by crush plastic deformation.

An iron golf club head according to a second aspect of the present invention is the iron golf club head according to the first aspect, wherein a hole into which the weight body is fitted is formed in the sole portion.

According to a third aspect of the present invention, in the iron golf club head according to the first aspect, a concave portion communicating with the hollow portion and extending along a sole surface is formed in the sole portion, and the weight main body is formed in the sole body. It is characterized in that it is arranged in a recess.

An iron golf club head according to a fourth aspect of the present invention is the iron golf club head according to the first aspect, wherein the through hole is opened in the hollow portion, and the hollow portion is a closed space. .

According to a fifth aspect of the present invention, in the iron golf club head according to the first aspect, the back face member has an opening opening to the cavity, and the hollow portion is an open space. And

The iron golf club set according to any one of claims 6 to 8 has a plate-like face member having a face surface, a thick sole portion, and is joined to the back side of the face member, An iron golf club head having a cavity back structure composed of a back face member forming a hollow portion between the member and a back face member, both of which include a weight member made of heavy metal inserted into the sole portion, The iron golf club set includes a combination of a long iron, a middle iron, and a short iron.

In the invention of claim 6, the weight member is integrated with at least the short iron head by press fitting. In the invention of claim 7, at least with the long iron head, The weight member is integrated by crush plastic deformation,
Further, in the invention according to claim 8, the weight member is integrated with at least the short iron head by press fitting, and the weight member is integrated with at least the long iron head by crush plastic deformation. I have.

According to a ninth aspect of the present invention, there is provided an iron golf club set according to any one of the sixth to eighth aspects, wherein the long iron is the club of No. 1 to No. 4, and the middle iron is the club of No. 5 to No. 8. Yes, the short iron is a ninth and wedge type club.

An iron golf club set according to the present invention has a plate-like face member having a face surface, a thick sole portion, and is joined to the back side of the face member, An iron golf club head having a cavity back structure composed of a back face member forming a hollow portion between the member and a back face member, both of which include a weight member made of heavy metal inserted into the sole portion, The iron golf club set includes a combination of a long iron and a short iron.

According to a tenth aspect of the present invention, the weight member is integrated with at least the short iron head by press-fitting, and according to the eleventh aspect of the present invention, at least the long iron head is integrated with the short iron head.
The weight member is integrated by crushing plastic deformation, and in the invention of claim 12, the weight member is integrated by press-fitting with respect to at least a short iron head, and at least with respect to a long iron head. Thus, the weight members are integrated by crush plastic deformation.

According to a thirteenth aspect of the present invention, there is provided an iron golf club set according to any one of the tenth to twelfth aspects, wherein the short irons are ninth and wedge-type clubs, and the long irons are smaller golf clubs. It is characterized by being.

An iron golf club set according to a fourteenth aspect of the present invention has a plate-like face member having a face surface, a thick sole portion, and is joined to the back side of the face member, and And an iron golf club head having a cavity back structure constituted by a back face member forming a hollow portion between them, and a weight member made of heavy metal is inserted into the sole portion. The loft angle of the iron golf club set increases with the number of irons, and the weight member is integrated with the iron club head having a loft angle of less than 39 degrees by crushing plastic deformation. For an iron club head having an angle of 39 degrees or more, the weight member is integrated by press fitting.

According to the first aspect of the present invention, in the iron golf club head having the cavity back structure, the back face member is joined to the back side of the plate-like face member, so that the back face of the face member and the back face member are joined to each other. A hollow portion is formed between them. A weight member having a large specific gravity is inserted into the thick sole portion of the back face member.

In this case, since the face member and the back face member are formed as separate members, a concave portion for forming a hollow portion is formed in the face member and / or the back face member before joining these members. It can be formed in advance. Thereby, even if the concave portion has a complicated shape, it is possible to easily form the concave portion of each member by molding or machining, thereby securing the degree of freedom in designing the head with respect to the shape of the concave portion. Also,
This also allows for fine adjustment of the weight distribution.

Further, since the hollow portion is formed on the back side of the plate-shaped face member, the area for restraining the face surface of the face member can be reduced, thereby increasing the repulsive force of the face surface and reducing the impact of the hit ball. The flight distance can be improved.

Further, since the weight member having a higher specific gravity than the face member and the back face member is inserted into the sole portion, the center of gravity of the head can be brought to a lower position, and the center of gravity of the head can be reduced. .

Further, the weight member is composed of a weight body and a projecting portion, and the projecting portion of the weight member is fitted into a through hole formed in the sole portion and is subjected to crushing plastic deformation, whereby the projecting portion is penetrated. Since the weight member is fixed to the hole, the weight member can be firmly fixed to the sole portion.

[0028] The weight body of the weight member may be as follows.
As described in the invention of the third aspect, it may be fitted into a hole formed in the sole part, or as described in the invention of the third aspect, communicate with the hollow part and along the sole surface May be arranged in a concave portion that extends.

The weight member is preferably made of a metal having a large specific gravity (for example, heavy metal). For example, when the face member and the back face member are made of stainless steel, the material of the weight member is as follows. From the viewpoint of abrasion resistance, for example, cobalt having higher hardness than stainless steel is preferable, and from the viewpoint of fixing strength, for example, brass having lower hardness than stainless steel is preferable. In addition, from the viewpoint of lowering the center of gravity, tungsten having a considerably higher specific gravity than stainless steel may be used as the weight member.

According to the fourth aspect of the present invention, the through hole is opened in the hollow portion, and the hollow portion is a closed space. Therefore, after joining the back face member and the face member, the protruding portion of the weight member is disposed in the hollow portion that is the closed space. As a result, it is possible to prevent the crushed plastically deformed protrusion from being exposed to the corrosive environment and prevent the occurrence of corrosion, and as a result, it is possible to maintain the fixing strength of the protrusion for a long period of time.

As described in the fifth aspect of the present invention, the hollow portion may be formed as an open space by forming an opening in the back face member. In this case, the degree of freedom in weight distribution is increased, and an iron golf club head with a lower center of gravity can be realized.

Claims 6 to 8, Claims 10 to 1
According to the second or fourteenth aspect, the back face member is joined to the plate-shaped face member to form a hollow structure, and the weight member made of heavy metal is inserted and installed in the sole portion. As in the first aspect of the present invention, the degree of freedom in the design of the head can be ensured with respect to the shape of the recess formed in the face member and / or the back face member so that a hollow portion is formed after joining, and the rebound of the face surface can be ensured. The flying distance of the hit ball can be improved by increasing the force, and the center of gravity of the head can be lowered.

Further, claims 7 and 8 or claim 1
In the inventions 1 and 12, since the weight member is fixed to at least the long iron head by crush plastic deformation, the weight main body can be firmly fixed to the sole portion. Here, the long iron is a club having the first to fourth clubs as described in the invention of claim 9, or a smaller iron than the short iron is described in the invention of claim 13. It means club. In the invention of claim 14, since the weight member is fixed by crush plastic deformation to the iron club head having a loft angle of less than 39 degrees, the weight main body can be firmly fixed to the sole portion.

The face member and the back face member are formed by die casting, press molding, injection molding, forging, casting or the like. The joining of the face member and the back face member is performed by welding, bonding, press-fitting, fitting, pressing, screwing, brazing, or the like.

[0035]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First Embodiment FIG. 1 is an exploded view of an iron golf club head having a cavity back structure according to a first embodiment of the present invention, and FIG. 2 is an assembled view of the iron golf club head of FIG. 3 is a sectional view (corresponding to a section taken along line II-II in FIG. 1), FIG. 3 is a view for explaining a method of attaching a weight member provided on the sole portion, and FIG. 4 is a view taken in the direction of arrow IV in FIG.

As shown in these figures, the iron golf club head 1 is mainly composed of a plate-like face member 2 having a face surface 2a and a back face member 3 arranged on the back side thereof. The neck part 4 is formed integrally with the back face member 3.

A joining surface 3a to which the back surface 2b of the face member 2 is joined is formed on the outer peripheral edge of the back face member 3. In a region surrounded by the joint surface 3a of the back face member 3, a concave portion 30 for forming the hollow portion 6 with the back surface 2b of the face member 2 is formed. In the recess 30, a part of the recess 3
1, 32 are formed. A thick sole portion 33 is formed below the back face member 3.

The weight member 5 is inserted into the sole portion 33. The weight member 5 includes a weight main body 51 and a protruding portion 52 protruding therefrom.
As shown in FIG. 3B, the sole portion 33 is formed with a hole 33a into which the weight body 51 is inserted and a through hole 33b into which the protruding portion 52 is inserted. Through hole 33b
Opens into the hollow portion 6 through the concave portion 31 (or 32). Note that a chamfered portion 33c is formed at the opening edge of the through hole 33b.

The weight member 5 is made of a metal (for example, heavy metal) having a higher specific gravity than the face member 2 and the back face member 3. When the face member 2 and the back face member 3 are made of, for example, stainless steel, as a constituent material of the weight member 5, from the viewpoint of further lowering the center of gravity, for example, tungsten, which is considerably larger in specific gravity than stainless steel, is preferable. Further, from the viewpoint of wear resistance, for example, cobalt is preferable, which is higher in hardness than stainless steel, and from the viewpoint of fixing strength, for example, brass, which is lower in hardness than stainless steel, is preferable.

Next, a method of attaching the weight member 5 will be described with reference to FIG. First, as the weight member 5, a member in which the length of the protruding portion 52 is slightly longer than the depth of the through hole 33 b of the sole portion 33 is prepared. Then, the weight main body 51 of the weight member 5 is inserted into the hole 33a and the protrusion 52
Are respectively inserted into the through holes 33b (see FIG. 3A). From this state, a load P is applied to the upper end of the protrusion 52 of the weight member 5 by a press machine or the like.

Then, as shown in FIG. 3 (b), the upper end of the protruding portion 52 undergoes crush plastic deformation, and the deformed portion serves as a retaining portion and fits into the chamfered portion 33c of the through hole 33b. Thus, the weight member 5 is firmly fixed to the sole portion 3. After attaching the weight member 5, the face member 2 is joined to the back face member 3 to assemble the iron golf club head.

According to the first embodiment, as described above, the plate-shaped face member 2 and the back face member 3 are formed as separate members, and the back face member 3 is provided on the back side of the face member 2. Are joined, so that a hollow portion 6 is formed between the back face 2 b of the face member 2 and the back face member 3. Therefore, the concave portion 30 and the concave portions 31 and 32 for forming the hollow portion 6 can be formed in the face member 2 in advance before joining the members. This makes it possible to easily form the recesses and recesses by molding and machining even if the recesses and recesses have complicated shapes. As a result, the degree of freedom in designing the head with respect to the shapes of the recesses and recesses is secured it can. Furthermore, this also allows for fine adjustment of the weight distribution.

Further, since the hollow portion 6 is formed on the back side of the plate-like face member 2, the area for restraining the face surface 2a of the face member 2 can be reduced.
By increasing the repulsive force of the face 2a, the flight distance of the hit ball can be improved.

It is desirable that the larger the cross-sectional area of the hollow portion 6 is, the larger the amount of deflection of the face surface 2a can be. However, in practice, as shown in FIG.
The ratio between the area 2 and the area S1 of the face surface 2a is sufficient if it is 60% or more, and preferably 70% or more. Note that the cross-sectional area S2 of the hollow portion 6 means a cross-sectional area of the hollow portion 6 when the hollow portion 6 is cut along a surface including the joint surface 3a of the back face member 3. Further, the smaller the area of the joining surface 3a of the back face member 3 is, the lower the joining force between the face member 2 and the back face member 3 is. Therefore, the area ratio is preferably 95% or less.

According to the first embodiment, since the weight member 5 having a higher specific gravity than the face member 2 and the back face member 3 is provided on the sole portion 33, the center of gravity of the head can be brought to a lower position. As a result, the center of gravity of the head can be reduced.

Moreover, in this case, the protrusion 52 of the weight member 5 is fitted into the through hole 33b of the sole portion 33 and is crushed and plastically deformed, so that the protrusion 52 is fixed to the through hole 33b. Therefore, the weight member 5 can be firmly fixed to the sole portion 33.

In this case, since the hollow space 6 is a closed space, the protrusion 52 of the crush-plastically deformed weight member 5 is prevented from being exposed to the corrosive environment to prevent the occurrence of corrosion. As a result, the fixing strength of the protrusion 52 can be maintained for a long period of time.

[ Second Embodiment ] FIG. 5 shows a second embodiment of the present invention.
FIG. 3 is a cross-sectional view of the iron golf club head according to the embodiment, in which the same reference numerals as in FIG. 2 indicate the same or corresponding parts. The second embodiment is largely different from the first embodiment in that the protrusion 52 of the weight member 5 is provided.
Is open to the outside of the hollow portion 6. The second embodiment has the same operation and effect as the first embodiment, except that the projection 52 of the weight member 5 is not exposed to a corrosive environment.

[ Third Embodiment ] FIG. 6 shows a third embodiment of the present invention.
FIG. 3 is a cross-sectional view of the iron golf club head according to the embodiment, in which the same reference numerals as in FIG. 2 indicate the same or corresponding parts. The third embodiment is significantly different from the first embodiment in that a concave portion 34 communicating with the hollow portion 6 and extending along the sole surface is formed in the sole portion 33, and the weight main body of the weight member 5 is formed. The point 51 is exposed in the recess 34. The point that the weight member 5 is fixed to the sole portion 33 by the crush plastic deformation of the upper end of the protruding portion 52 of the weight member 5 is the same as in the first embodiment.

In this case, the lower portion of the face member 2 is bent and extended so as to cover the concave portion 34 from below, and the lower surface of the extended portion 20 constitutes a sole surface. The distal end of the extending portion 20 of the face member 2 is joined to the joining surface 3a 'of the back face member 3. Thereby, similarly to the hollow part 6, the concave part 34 is also a closed airtight space.

In the third embodiment as well, the first
However, in this case, not only the protruding portion 52 of the weight member 5 but also the weight main body 51 are disposed in the closed airtight space. The entire weight member 5 can be prevented from being exposed to a corrosive environment.

Further, in this case, unlike the first and second embodiments, since the weight member 5 is not exposed on the sole surface, it is necessary to determine the constituent material of the weight member 5 from the viewpoint of wear resistance. Disappears. That is, it is possible to improve the fixing strength by selecting a material having a hardness that is not too high.

[ Fourth Embodiment ] FIG. 7 shows a fourth embodiment of the present invention.
FIG. 7 is a cross-sectional view of the iron golf club head according to the embodiment, in which the same reference numerals as in FIG. 6 indicate the same or corresponding parts. The fourth embodiment is significantly different from the third embodiment in that the protrusion 52 of the weight member 5 is provided.
Is open to the outside of the hollow portion 6. The fourth embodiment has the same operation and effect as the third embodiment, except that the projection 52 of the weight member 5 is not exposed to a corrosive environment.

Further, in this case, the upper portion of the face member 2 is bent and extended so that the upper joint surface 3a of the back face member 3 is arranged away from the face surface 2a. By arranging the joint surface 3a at an appropriate position, it is possible to reduce the impact force acting on the joint at the time of impact of the ball, thereby reducing the variation in the deflection of the face surface 2a. A concave portion 21 is formed on the back surface 2b of the face member 2 by bending and extending an upper portion of the face member 2, and a hollow portion is formed by the concave portion 21 and the concave portion 30 on the back face member 3 side. 6 are formed.

[ Fifth Embodiment ] FIGS. 8 and 9 show a fifth embodiment of the present invention. FIG. 8 corresponds to a modification of FIG. 5, and FIG. 9 shows a modification of FIG. It corresponds to an example. In the fifth embodiment, an opening 35 is formed in the back face member 3, and the hollow portion 6 is an open space through the opening 35.

As described above, by forming the opening 35 in the back face member 3, the degree of freedom in weight distribution is increased, and an iron golf club head having a lower center of gravity can be realized.

Sixth Embodiment In the first to fifth embodiments, the iron golf club head structure applied regardless of the number of clubs has been described, but in the sixth embodiment, In the iron golf club set, the mounting method of the weight member is made different depending on the number of clubs or the loft angle.

When the iron golf club set is classified into a long iron, a middle iron, and a short iron, the weight member is fixed to the sole portion by press-fitting at least the short iron head. For a long iron head, the weight member is fixed to the sole portion by the above-described crush plastic deformation. Here, the long iron is the club number 1 to 4 and the middle iron is 5
The No. 8 to No. 8 clubs and the short iron refer to No. 9 and wedge clubs, respectively. Pressing means that a weight member is fitted into a hole formed in the sole portion by interference fit.

When the iron golf club set is classified into two types, a long iron and a short iron, the weight member is fixed to the sole portion by press-fitting at least to the head of the short iron, and at least the long iron is fixed. For iron heads,
The weight member is fixed to the sole portion by the above-described crush plastic deformation. Here, the short iron refers to a club of No. 9 and wedges, and the long iron refers to a club of a smaller number. Similarly, press fitting means that a weight member is fitted into a hole formed in the sole portion by interference fitting.

Next, when the iron golf club set is classified according to the magnitude of the loft angle (the angle α in FIG. 2), the above-described crush plastic deformation is applied to the iron club head having a loft angle of less than 39 degrees. To fix the weight member to the sole portion, and for an iron club head having a loft angle of 39 degrees or more, the weight member is fixed to the sole portion by press-fitting. Here, press fitting is
Similarly, it means that the weight member is fitted into the hole formed in the sole portion by interference fit.

[0061]

As described above in detail, according to the iron golf club head of the present invention, the back face member is joined to the back face member by joining the back face member to the back side of the plate-shaped face member. Since a hollow portion is formed between the recesses, even if the concave portion formed in the face member and / or the back face member has a complicated shape, it can be easily formed by molding or machining. Thus, there is an effect that the degree of freedom in designing the head with respect to the shape of the concave portion can be secured.

Further, since the hollow portion is formed on the back side of the plate-like face member, the area for restraining the face surface of the face member can be reduced, thereby increasing the repulsive force of the face surface. This has the effect of improving the flight distance of a hit ball.

Further, since the weight member having a higher specific gravity than the face member and the back face member is inserted into the sole portion, the center of gravity of the head can be brought to a lower position, and the center of gravity of the head can be reduced. Has the effect of becoming

Further, since the protrusion of the weight member is fitted into the through hole formed in the sole portion to cause crush plastic deformation, there is an effect that the weight member can be firmly fixed to the sole portion.

Further, in the iron golf club set according to the present invention, the weight member is integrated with at least the head of the short iron or the head having a loft angle of 39 degrees or more by press-fitting. Since these heads are originally configured with a low center of gravity, a heavy weight member is not required, and press-fitting of the weight member is sufficient. Therefore, by responding to these heads by press fitting, the structure of the head can be simplified, and the manufacturing cost can be reduced.

Further, in the iron golf club set according to the present invention, the weight member is integrated with at least a long iron head or a head having a loft angle of less than 39 degrees by crush plastic deformation. I have. Since these heads are originally arranged at a position where the center of gravity is high, it is necessary to provide a heavy weight member, and in order to securely attach the weight member,
It is necessary to provide a projection on the weight member and to cause the projection to undergo crush plastic deformation. Therefore, by attaching the weight member to these heads by crushing plastic deformation, the fixing strength of the weight member can be improved, and the impact resistance at impact can be improved.

[Brief description of the drawings]

FIG. 1 is an exploded view of an iron golf club head according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the iron golf club head according to the first embodiment of the present invention, corresponding to a cross section taken along line II-II of FIG.

FIG. 3 is a view for explaining a method of attaching a weight member provided on a sole portion of the iron golf club head according to the first embodiment of the present invention.

FIG. 4 is a view taken in the direction of the arrow IV in FIG. 2;

FIG. 5 is a sectional view of an iron golf club head according to a second embodiment of the present invention.

FIG. 6 is a sectional view of an iron golf club head according to a third embodiment of the present invention.

FIG. 7 is a sectional view of an iron golf club head according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of an iron golf club head according to a fifth embodiment of the present invention, corresponding to a modification of FIG.

FIG. 9 is a sectional view of an iron golf club head according to a fifth embodiment of the present invention, corresponding to a modification of FIG. 7;

FIG. 10 is a sectional view of a conventional iron golf club head.

FIG. 11 is a sectional view of a conventional iron golf club head.

[Explanation of symbols]

 1: Iron golf club head 2: Face member 2a: Face surface 2b: Back surface 3: Back face member 3a: Joining surface 33: Sole portion 33a: Hole 33b: Through hole 34: Recess 35: Opening 5: Weight member 51: Weight body 52: Projection 6: Hollow

Claims (14)

[Claims] 1. An iron golf club head having a cavity back structure having a cavity on the back side of a head, comprising: a plate-shaped face member having a face surface; and a thick sole portion, the back side of the face member. A back face member that forms a hollow portion with the back surface of the face member, and a weight that is inserted into the sole portion and is made of metal having a specific gravity greater than that of the face member and the back face member The weight member is composed of a weight main body and a protruding portion projecting therefrom, and the sole portion is formed with a through hole into which at least the protruding portion of the weight member is fitted, The protrusion is fixed to the through-hole by crush plastic deformation,
An iron golf club head, characterized in that: 2. The iron golf club head according to claim 1, wherein the sole portion further includes a hole into which the weight body is fitted. 3. The iron golf club head according to claim 1, wherein the sole portion is formed with a concave portion communicating with the hollow portion and extending along the sole surface, and the weight main body is formed in the concave portion. An iron golf club head, which is disposed. 4. The iron golf club head according to claim 1, wherein the through-hole is open in the hollow portion, and the hollow portion is a closed space in which the hollow portion is closed. head. 5. The iron golf club head according to claim 1, wherein the back face member has an opening that opens to the cavity, and the hollow portion is an open space. Iron golf club head. 6. A back which has a plate-shaped face member having a face surface and a thick sole portion, is joined to the back side of the face member, and forms a hollow portion with the face member. An iron golf club set including an iron golf club head having a cavity back structure constituted by a face member and a weight member made of a heavy metal is inserted into the sole portion, and the iron golf club set includes a long iron and a middle iron. An iron golf club set comprising a combination of a short iron and at least a head member of the short iron, wherein the weight member is integrated by press-fitting. 7. A back which has a plate-shaped face member having a face surface and a thick sole portion, is joined to a back side of the face member, and forms a hollow portion with the face member. An iron golf club set including an iron golf club head having a cavity back structure constituted by a face member and a weight member made of a heavy metal is inserted into the sole portion, and the iron golf club set includes a long iron and a middle iron. And a short iron, wherein the weight member is integrated with at least a long iron head by crush plastic deformation. 8. A back which has a plate-shaped face member having a face surface and a thick sole portion, is joined to the back side of the face member, and forms a hollow portion with the face member. An iron golf club set including an iron golf club head having a cavity back structure constituted by a face member and a weight member made of a heavy metal is inserted into the sole portion, and the iron golf club set includes a long iron and a middle iron. And a combination of short irons, wherein the weight member is integrated with at least the short iron head by press fitting, and the weight member is integrated with at least the long iron head by crush plastic deformation. Yes,
An iron golf club set, characterized in that: 9. The iron golf club set according to claim 6, wherein the long iron is a No. 1 to No. 4 club, the middle iron is a No. 5 to No. 8 club, and a short iron. Is a ninth and wedge type club. 10. A back having a plate-shaped face member having a face surface and a thick sole portion, being joined to the back side of the face member and forming a hollow portion with the face member. An iron golf club set including an iron golf club head having a cavity back structure constituted by a face member and a weight member made of heavy metal is inserted into the sole portion, and the iron golf club set includes a long iron and a short iron. An iron golf club set, characterized in that the weight member is integrated by press-fitting at least to a short iron head. 11. A back which has a plate-shaped face member having a face surface and a thick sole portion, is joined to the back side of the face member, and forms a hollow portion with the face member. An iron golf club set including an iron golf club head having a cavity back structure constituted by a face member and a weight member made of heavy metal is inserted into the sole portion, and the iron golf club set includes a long iron and a short iron. An iron golf club set, wherein the weight member is integrated with at least a long iron head by crush plastic deformation. 12. A back which has a plate-shaped face member having a face surface and a thick sole portion, is joined to the back side of the face member, and forms a hollow portion with the face member. An iron golf club set including an iron golf club head having a cavity back structure constituted by a face member and a weight member made of heavy metal is inserted into the sole portion, and the iron golf club set includes a long iron and a short iron. Wherein the weight member is integrated with at least the short iron head by press fitting, and the weight member is integrated with at least the long iron head by crush plastic deformation. Iron golf club center characterized by Door. 13. The iron golf club set according to claim 10, wherein the short iron is a ninth and wedge type club, and the long iron is a golf club having a smaller iron count. An iron golf club set characterized by the following. 14. A back having a plate-shaped face member having a face surface and a thick sole portion, being joined to the back side of the face member and forming a hollow portion with the face member. In an iron golf club set including an iron golf club head having a cavity back structure composed of a face member, a weight member made of heavy metal is inserted into the sole portion, and the iron golf club set has an increased count. The weight member is integrated by crush plastic deformation with respect to an iron club head having a loft angle of less than 39 degrees, and the iron club head having a loft angle of 39 degrees or more with respect to an iron club head having a loft angle of less than 39 degrees. Wherein the weight member is integrated by press-fitting. Love set.