JP2003062132A - Iron golf club and iron golf club set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cavity iron and an iron golf club set in which a sweet area and a centroid position at a head part can be controlled while avoiding the increase of a manufacturing cost and which has a head part easy to address. SOLUTION: This iron golf club is provided with the head portion 1 of a cavity structure. The head portion 1 is formed by joining a face-side part 8 including a face portion 6 and a back-side part 9 including a back portion 7. By making a surface on the side of a hollow portion 14 at the back portion 7 project toward the side of the face portion 6 selectively, the thickness of the back portion 7 is varied in the direction of the toe and heel of the head portion 1. In this iron golf club set, the thickness distribution of the back portion in the toe and heel direction of the head portion 1 of the cavity structure is differentiated by a long iron, a middle iron and a short iron.

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 and an iron golf club set, and more particularly,
The present invention relates to an iron golf club and an iron golf club set having a hollow structure head portion.

[0002]

2. Description of the Related Art So-called hollow irons having a hollow portion inside the head have been known. In the head part of this hollow iron, in order to make it easier for the ball to rise when hitting the ball and to improve the flight distance, the moment of inertia around the center of gravity of the head part is increased to expand the sweet area, and the center of gravity position of the head part is lowered. It is important to increase the depth of the center of gravity.

Therefore, in the head portion of the hollow iron, the sole portion is made of a metal material having a higher specific gravity than the other portions to increase the moment of inertia around the center of gravity of the head portion, and the weight is provided inside the head portion. Japanese Patent Laid-Open No. 10-263122 discloses an example in which the position of the center of gravity is adjusted by installing.

[0004]

SUMMARY OF THE INVENTION However, Japanese Patent Laid-Open No. Hei 10
In the hollow iron disclosed in Japanese Patent No. 263122, since the sole portion is made of a material having a high specific gravity and the weight is installed in the head portion, there is a problem that the manufacturing process becomes complicated and the cost increases.

Further, in the head portion disclosed in the above-mentioned document, since the sole width in the direction from the face portion to the back portion is wide, the rear surface of the head portion comes into view when addressing,
There was also the problem that it was difficult to address.

Therefore, the present invention provides a hollow iron and an iron golf club set which can control the sweet area and the position of the center of gravity in the head portion while avoiding an increase in manufacturing cost, and which has a head portion which is easily addressed. With the goal.

[0007]

An iron golf club according to the present invention includes a head portion having a hollow structure. The head part is formed by joining a face side part including a face part and a back side part including a back part, and by selectively projecting the hollow part side surface of the back part toward the face part side, The thickness of the part
Change to heel direction.

By properly adjusting the thickness of the back portion in this way, the mass distribution in the head portion can be changed, and the center of gravity position and the sweet area can be appropriately adjusted according to each iron golf club. . Further, since the thickness of the back portion is adjusted to adjust the position of the center of gravity and the sweet area, it is not necessary to use a high specific gravity member or a weight as in the conventional example, and the manufacturing process can be simplified. it can. Further, since the surface of the back portion on the hollow portion side is selectively projected to the face portion side, although the shape and volume of the hollow portion of the head portion are changed by various iron golf clubs, the back portion is projected rearward. Can be prevented, and the back part can be prevented from coming into view at the time of addressing.

The back portion preferably has a first area located on the toe side, a second area located on the central part, and a third area located on the heel side. In this case, the thickness of the first and third regions and the thickness of the second region in the back portion are made different. Thereby, the mass distribution in the back portion can be changed, and the position of the center of gravity and the sweet area can be easily adjusted.

When the iron golf club is a long iron, the thickness of the portion located near the sole portion in the first and third regions is made larger than the thickness of the portion located near the sole portion in the second region. It should be noted that in the present specification, the "long iron" means an iron golf club from 1 iron to 4 iron.

As described above, by making the thickness of the predetermined portion in the first and third regions located on the toe side or the heel side of the back portion larger than the thickness of the predetermined portion in the second region, the head portion The moment of inertia can be increased, and the sweet area of the long iron can be expanded.

On the other hand, when the iron golf club is a short iron, the thickness of the portion located on the sole portion side in the second region is larger than the thickness of the portion located on the sole portion side in the first and third regions. To do. Here, the short iron is an iron golf club from the eighth iron to the pitching wedge in the present specification.

As described above, the thickness of the portion located on the sole portion side in the second region located in the center portion of the back portion in the toe-heel direction is set to the sole portion side in the first and third regions located on both sides thereof. The center of gravity of the head portion can be lowered by increasing the thickness of the second region located on the sole portion side by making the thickness larger than the thickness of the positioned portion. By relatively thickening the second region located at the center of the head in the toe-heel direction,
The moment of inertia of the head part becomes slightly smaller, and the sweet area of the short iron becomes slightly smaller accordingly, but since the sweet area of the short iron is originally large, there is practically no problem.

A rib is preferably provided at the boundary between the first, second and third regions. By providing the rib in this way, vibration of the outer shell of the head portion can be suppressed, and reverberant sound after hitting the ball can be reduced. As a result, the discomfort to the player due to the reverberation sound can be reduced.

The iron golf club set of the present invention is
It has a long iron, a middle iron and a short iron each having a hollow head portion. The head part is
It is formed by joining the face side part including the face part and the back side part including the back part, and makes the thickness distribution of the back part in the toe-heel direction of the head part different between the long iron, the middle iron and the short iron. .

In this way, by making the thickness distribution of the back portion in the toe-heel direction of the head portion different for the long iron, the middle iron and the short iron, for example, in the long iron, the moment of inertia of the head portion is increased and the sweet area is increased. Can be expanded, and the center of gravity can be lowered with the short iron. In other words, the optimum mass distribution for various iron golf clubs can be easily obtained,
The position of the center of gravity and the sweet area can be adjusted according to the characteristics of various iron golf clubs.

The back portion is a first portion located on the toe portion side.
It may have a region, a second region located at the center, and a third region located on the heel side. In this case, the thickness of the second region is made different for the long iron, the middle iron and the short iron. Thereby,
The mass distribution of the head portion can be changed according to the required characteristics of various iron golf clubs, and the center of gravity and the sweet area can be adjusted according to the characteristics of various iron golf clubs as described above.

The thickness of the second region is set to a long iron,
Thicken in order of middle iron, short iron, first
And it is preferable that the thickness of the third region is equal in the long iron, the middle iron and the short iron.

As a result, in the long iron, the moment of inertia is increased to increase the sweet area,
In the middle iron, the standard sweet area and the center of gravity position can be secured, and in the short iron, the center of gravity of the head portion can be lowered although the moment of inertia is slightly reduced.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

The iron golf club according to the present invention has a hollow head portion. The head part is formed by joining a face side part including a face part and a back side part including a back part. In a given club, it is important to change the thickness of the back portion in the toe-heel direction of the head portion by selectively projecting the surface of the back portion on the hollow portion side toward the face portion. To do.

Thereby, the mass distribution in the head portion is changed according to the required characteristics of various iron golf clubs to adjust the center of gravity of the head portion and the sweet area, while preventing the back portion from protruding rearward. Therefore, it is possible to prevent the back portion from coming into view when addressing. In addition, it is not necessary to use a high specific gravity member or a weight as in the conventional example, and the manufacturing process can be simplified.

FIG. 1 shows a rear view of a head portion 1 of a long iron (for example, the number is 3 to 5) according to the present invention. 2 shows a sectional view taken along the line II-II in FIG. 1, and FIG. 3 shows a sectional view taken along the line III-III in FIG. It should be noted that since the shapes of the shaft and the grip can be known ones, their illustration is omitted. The same applies to middle irons and short irons described later.

As shown in FIGS. 1 to 3, the head unit 1 is
It has a hollow structure and is formed by joining a face-side part 8 including a face portion 6 and a back-side part 9 including a back portion 7. The toe portion 2, the sole portion 3, the heel portion 4, and the top edge portion 5 are formed. , A face portion 6 and a back portion 7.
The face side part 8 and the back side part 9 are joined by welding.

In the example shown in FIG. 1, the back portion 7 is located at the first region 10 located on the toe portion 2 side and at the center portion in the toe-heel direction which is the direction from the toe portion 2 toward the heel portion 4. It is divided into three regions, a second region 11 and a third region 12 located on the heel portion 4 side. The back unit 7 may be divided into a plurality of regions, and the back unit 7 may be divided into an arbitrary number of regions other than three.

First, second and third regions 10, 11, 1
A rib 13 is provided at the boundary between the two. The rib 13 is
It is provided so as to extend from the sole portion 3 toward the top edge portion 5 and project from the surface of the back portion 7 located inside the head portion 1 on the hollow portion 14 side toward the face portion 6 side.

By providing the ribs 13, it is possible to suppress the vibration of the outer shell of the head portion 1 and reduce the reverberant sound after hitting the ball. As a result, the discomfort to the player due to the reverberation sound can be reduced.

In the back portion 7 described above, the first and third regions 10 and 12 have the same thickness, and the thickness of the second region 11 is different from the thickness thereof. More specifically, the bottom portion (sole portion 3) of the first region 10 in the back portion 7 shown in FIG.
The thickness t1 of the portion located in the vicinity) is made equal to the thickness of the bottom portion of the third region 12 and is larger than the thickness t2 of the bottom portion of the second region 11 shown in FIG.

Specifically, the thickness t1 is 3 mm to 8 m.
The thickness t2 is about 1.5 mm to 3 mm.

By making the thicknesses of the first and third regions 10 and 12 in the back portion 7 larger than the thickness of the second region 11 as described above, the moment of inertia of the head portion 1 can be increased, and the head portion 1 can be made long. Iron head part 1
The sweet area in can be expanded.

Further, the portions of the first and third regions 10 and 12 on the side of the sole portion 3 are arranged on the back portion 7 as shown in FIG.
Since the portion located on the hollow portion 14 side is projected forward (to the face portion 6 side), the back portion 7 does not project backward and enter the player's view.

Next, the middle iron according to the present invention will be described with reference to FIGS. 4 to 6. FIG. 4 shows a rear view of the head portion 1 of the middle iron (for example, the number is 6 to 8) of the present invention. FIG. 5 shows a sectional view taken along line VV in FIG. 4, and FIG. 6 shows VI-VI in FIG.
A sectional view taken along the line is shown.

As shown in FIG. 4, also in the head portion 1 of the middle iron, the back portion 7 has three regions 10 to 12.
And ribs 13 are provided between the regions 10 to 12. However, in the head part 1 of the middle iron, the thickness of the back part 7 is not changed in the toe-heel direction. That is, the thickness t3 of the bottom of the second region 11 shown in FIG.
And the thicknesses of the bottoms of the third regions 10 and 12 are made equal. The other configurations are similar to those of the long iron.

As shown in FIG. 6, the rib 13 has a hollow portion 14.
From the surface of the back portion 7 that defines Therefore, in the portion where the rib 13 is provided, the width of the hollow portion 14 in the direction from the back portion 7 to the face portion 6 becomes small.

Next, the short iron according to the present invention will be described with reference to FIGS. 7 to 9. FIG. 7 shows a rear view of the head portion 1 of the short iron (for example, a number 9 and a pitching wedge) of the present invention. FIG. 8 is a sectional view taken along line VIII-VIII in FIG.
7 shows a sectional view taken along the line IX-IX in FIG.

As shown in FIG. 7, even in the head portion 1 of the short iron, the back portion 7 has three areas 10 to 1.
It is divided into two and ribs 13 are provided between the regions 10 to 12. Then, as shown in FIGS. 8 and 9, in the head portion 1 of the short iron, the thickness of the second region 11 in the back portion 7 is made larger than the thickness of the first and third regions 10 and 12.

More specifically, as shown in FIG. 9, the surface of the second region 11 facing the hollow portion 14 is projected to the face portion 6 side almost all over, and the height direction of the second region 11 (from the sole portion 3). The thickness t5 of the portion from the central portion to the vicinity of the sole portion 3 in the direction toward the top edge portion 5 is the thickness of the portion from the central portion to the vicinity of the sole portion 3 in the height direction of the first and third regions 10 and 12. Make it thicker than t4. Specifically, the thickness t5 is about 3 mm to 8 mm,
The thickness t4 is about 2 mm to 5 mm.

As described above, by making the thickness t5 larger than the thickness t4, the moment of inertia of the head portion 1 is slightly reduced, but the thickness of the second region 11 near the sole portion 3 can be made thicker. The center of gravity of the part 1 can be lowered.

Next, the iron golf club set of the present invention will be described. The iron golf club set of the present invention includes a long iron, a middle iron and a short iron each having the head portion 1 having the hollow structure described above. Then, the thickness distribution of the back portion 7 in the toe-heel direction of the head portion 1 is made different for the long iron, the middle iron and the short iron.

The first back portion 7 is located on the toe portion 2 side.
Region 10, a second region 11 located at the center of the head 1 in the toe-heel direction, and a third region located on the heel 4 side.
In the case of having the region 12, the thickness of the second region 11 is made different for the long iron, the middle iron and the short iron.

More specifically, the thickness of a predetermined portion of the second region 11 is increased in the order of long iron, middle iron and short iron, and the first and third regions 10,
Make the thicknesses of 12 equal for long irons, middle irons and short irons.

At this time, as described above, by selectively projecting the surface of the back portion 7 of the head portion 1 on the hollow portion 14 side toward the face portion 6 side, the thickness of the predetermined portion in the second region 11 is made long iron. Differentiate, middle iron and short iron. Therefore, as shown in FIG. 3, FIG. 5 and FIG. 9, the shape of the hollow portion 14 is different between the long iron, the middle iron and the short iron.

By appropriately adjusting the thickness of the second region 11 as described above, for example, in the long iron, the moment of inertia of the head portion 1 is increased to expand the sweet area, and in the middle iron, the standard sweet area and The position of the center of gravity can be secured, and the center of gravity of the short iron can be lowered to improve the directionality of the ball. That is, the optimum mass distribution for various iron golf clubs can be easily obtained, and the position of the center of gravity and the sweet area can be easily adjusted according to the various iron golf clubs.

Although the embodiments of the present invention have been described above, it should be considered that the embodiments disclosed this time are exemplifications in all points and not restrictive. The scope of the invention is indicated by the claims,
The meaning equivalent to the scope of claims and all modifications within the scope are included.

[0045]

According to the present invention, the center of gravity and the sweet area can be relatively adjusted according to the required characteristics of various iron golf clubs such as long irons, middle irons and short irons. Can enlarge the sweet area, while the short iron can lower the center of gravity of the head. At this time, since it is only necessary to adjust the thickness of the back portion, the manufacturing process can be simplified and the manufacturing cost can be reduced. In addition, it is possible to prevent the back portion from entering the field of view at the time of addressing, so that the head has a shape that facilitates addressing.

[Brief description of drawings]

FIG. 1 is a rear view of a head portion of a long iron according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a rear view of the head portion of the middle iron according to the embodiment of the present invention.

5 is a cross-sectional view taken along the line VV in FIG.

6 is a cross-sectional view taken along line VI-VI in FIG.

FIG. 7 is a rear view of the head portion of the short iron according to the embodiment of the present invention.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

1 head part, 2 toe part, 3 sole part, 4 heel part, 5 top edge part, 6 face part, 7 back part, 8 face side parts, 9 back side parts, 10
1st area, 11 2nd area, 12 3rd area, 13
Rib, 14 hollow.

Claims (8)

[Claims] 1. An iron golf club having a hollow head portion (1), wherein the head portion (1) includes a face-side part (8) including a face portion (6) and a back portion (7). And a back side part (9) including a back side part (9), the hollow part (14) side surface of the back part (7) is selectively protruded to the face part (6) side. The thickness of the back portion (7) is the same as that of the head portion (1).
The iron golf club changed to the toe and heel directions. 2. The back portion (7) has a first area (10) located on the toe portion (2) side and a second area (10) located in the central portion.
A region (11) and a third region (12) located on the heel portion (4) side, and the thickness of the first and third regions (10, 12) in the back portion (7), The iron golf club according to claim 1, wherein the second regions (11) have different thicknesses. 3. The iron golf club is a long iron golf club, and a thickness of a portion of the first and third regions (10, 12) located in the vicinity of the sole portion (3) is set to the second region (3). The iron golf club according to claim 2, wherein the thickness is larger than the thickness of a portion of the member (11) located near the sole portion (3). 4. The iron golf club is a short iron golf club, wherein the thickness of a portion of the second region (11) located on the sole portion (3) side is set to the first and third regions (10, 1
The iron golf club according to claim 2, wherein the thickness is larger than the thickness of the portion located on the sole portion (3) side in 2). 5. The first, second and third regions (10,
The iron golf club according to any one of claims 2 to 4, wherein a rib (13) is provided at a boundary between the (11, 12). 6. An iron golf club set comprising a long iron golf club, a middle iron golf club, and a short iron golf club having a hollow head portion (1), wherein the head portion (1) is a face portion. The face side part (8) including (6) and the back side part (9) including the back part (7) are formed by joining, and the back part (toe-heel direction of the head part (1) ( An iron golf club set, wherein the thickness distribution of 7) is different for the long iron golf club, the middle iron golf club, and the short iron golf club. 7. The back portion (7) has a first area (10) located on the toe portion (2) side and a second area (10) located in the central portion.
It has an area | region (11) and a 3rd area | region (12) located in a heel part (4) side, The thickness of the said 2nd area | region (11) is the said long iron golf club, a middle iron golf club, and a short iron. The iron golf club set according to claim 6, wherein the golf clubs are different. 8. The thickness of the second region (11) is increased in the order of the long iron golf club, the middle iron golf club, and the short iron golf club, and the thickness of the first and third regions (10, 12). The iron golf club set according to claim 7, wherein the long iron golf club, the middle iron golf club, and the short iron golf club are equal to each other.