Iron golf club head

Abstract

To provide an iron golf club head capable of lowering the center of gravity and suppressing the reduction of a coefficient of restitution especially in an off-center shot.SOLUTION: Iron golf club head 100 includes a head body 1 and a high specific gravity member 2 having a specific gravity higher than that of head body 1. The head body 1 includes a face portion 10 having a face surface 11 and a back surface 12, a toe portion 20, a heel portion 30, a top edge portion 40, a sole portion 50, and a step portion 13 arranged with a gap G from the back surface 12 in a face-back direction FB in which the face surface 11 and the back surface 12 face each other. The high specific gravity member 2 is placed on the step portion 13, and is disposed with a space S between the high specific gravity member 2 and the sole portion 50 in a top sole direction TS in which the top edge portion 40 and the sole portion 50 face each other.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an iron golf club head. [Background technology]

[0002] Conventionally, iron golf club heads equipped with a high specific gravity member to lower the center of gravity have been proposed. For example, Japanese Patent Application Laid-Open Publication No. 2020-178933 (Patent Document 1) describes an iron golf club head equipped with a weight member having a specific gravity greater than that of the head body and face plate. The weight member is inserted into a body recess in the head body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-178933 Summary of the Invention [Problem to be solved by the invention]

[0004] The iron golf club head described in the above publication has a problem in that the coefficient of restitution decreases because the deflection of the sole portion is suppressed by the weight member.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide an iron golf club head that has a lower center of gravity and can suppress a decrease in the coefficient of restitution, particularly on off-center shots. [Means for solving the problem]

[0006] The iron golf club head of the present invention includes a head body and a high-specific-gravity member having a higher specific gravity than the head body. The head body includes a face portion having a face surface and a back surface, a toe portion continuous with the face portion, a heel portion continuous with the face portion and facing the toe portion across the face portion, a top edge portion continuous with the face portion, a sole portion continuous with the face portion and facing the top edge portion across the face portion, and a step portion disposed with a gap from the back surface in the face-back direction in which the face surface and the back surface face each other. The high-specific-gravity member is placed on the step portion and disposed with a space between the high-specific-gravity member and the sole portion in the top-sole direction in which the top edge portion and the sole portion face each other. [Effects of the Invention]

[0007] According to the iron golf club head of the present invention, it is possible to achieve a lower center of gravity and to suppress a decrease in the coefficient of restitution, particularly on off-center shots. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front view schematically showing a configuration of an iron golf club head according to an embodiment. [Figure 2] 1 is a rear view schematically showing the configuration of an iron golf club head according to an embodiment. [Figure 3] 1 is a right side view schematically showing a configuration of an iron golf club head according to an embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. [Figure 5] FIG. 3 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] FIG. 8 is a diagram in which the high specific gravity member is removed from FIG. 7. [Figure 9]1 is a rear view showing a schematic configuration of an iron golf club according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Unless otherwise specified, the same or corresponding parts in the following drawings will be designated by the same reference numerals, and the description thereof will not be repeated.

[0010] An iron golf club head 100 according to an embodiment will be described with reference to FIGS.

[0011] As shown in FIGS. 1 to 4, an iron golf club head 100 according to the embodiment includes a head body 1 and a high specific gravity member 2. As shown in FIG.

[0012] The head body 1 includes a face portion 10, a toe portion 20, a heel portion 30, a top edge portion 40, a sole portion 50, a hosel portion 60, and a cavity wall portion 70.

[0013] The face portion 10 has a face surface 11 and a back surface 12. The face surface 11 is disposed on the front side of the face portion 10. The face surface 11 constitutes a ball-hitting surface. A plurality of scorelines 11a are provided on the face surface 11. Each of the plurality of scorelines 11a is provided continuously on the face surface 11.

[0014] Each of the plurality of scorelines 11a extends in a toe-heel direction TH in which the toe portion 20 and the heel portion 30 face each other. Each of the plurality of scorelines 11a is provided linearly in a direction crossing the face surface 11. The plurality of scorelines 11a are provided at intervals in a top-sole direction TS in which the top edge portion 40 and the sole portion 50 face each other. The plurality of scorelines 11a are provided at approximately equal intervals in a direction crossing the face surface 11 in a longitudinal direction.

[0015] The back surface 12 is located behind (on the back surface of) the face surface 11. The back surface 12 is located on the opposite side to the face surface 11.

[0016] The toe portion 20 is a portion that connects the top edge portion 40 on the side away from the hosel portion 60 and the sole portion 50. The toe portion 20 is continuous with the face portion 10. The heel portion 30 is a portion that extends from the lower end of the hosel portion 60 to the sole portion 50. The heel portion 30 is continuous with the face portion 10. The heel portion 30 faces the toe portion 20 with the face portion 10 in between.

[0017] The top edge portion 40 is a portion that constitutes the upper edge of the iron golf club head 100, extending from the hosel portion 60 to the toe portion 20. The top edge portion 40 is continuous with the face portion 10. The sole portion 50 is a portion that constitutes the bottom of the iron golf club head 100. The sole portion 50 is continuous with the face portion 10. The sole portion 50 faces the top edge portion 40, with the face portion 10 in between.

[0018] The hosel portion 60 is connected to the heel portion 30. The hosel portion 60 is a portion to which the shaft is connected. The hosel portion 60 includes a region that is bent when adjusting the lie angle and loft angle.

[0019] The face portion 10 and the hosel portion 60 are made of the same material. The material of the face portion 10 and the hosel portion 60 is, for example, chrome molybdenum steel or nickel chrome molybdenum steel. The material of the face portion 10 and the hosel portion 60 is preferably nickel chrome molybdenum steel. The face portion 10 other than the face surface 11 of the iron golf club head 100 according to the embodiment is made of the same material as the face surface 11.

[0020] The face portion 10 and the hosel portion 60 may be formed by casting or forging. For example, the iron golf club head 100 according to the embodiment has a one-piece casting structure.

[0021] The cavity wall portion 70 surrounds the periphery of the back surface 12. The cavity wall portion 70 is configured to fit along the toe portion 20, the heel portion 30, the top edge portion 40, and the sole portion 50. The cavity wall portion 70 defines a cavity 80. The cavity 80 is surrounded by the cavity wall portion 70.

[0022] The sole portion 50 includes a thin portion 51. The thin portion 51 of the sole portion 50 is a portion where the cavity wall portion 70 is not provided. In the top-sole direction TS, a thickness (first thickness) T1 of the thin portion 51 facing the toe side portion 21 and a thickness (second thickness) T2 of the thin portion 51 facing the heel side portion 22 are each thinner than a thickness (third thickness) T3 of the thin portion 51 facing the central portion 23. The first thickness T1 is, for example, 1.5 mm. The second thickness T2 is, for example, 1.5 mm. The third thickness T3 is, for example, 1.9 mm.

[0023] The head body 1 has a step portion 13. The step portion 13 is disposed with a gap G between it and the back surface 12 in the face-back direction FB, in which the face surface 11 and the back surface 12 face each other. The step portion 13 is disposed so as to face the back surface 12 in the face-back direction FB. The step portion 13 is provided so as to protrude from the thin-walled sole portion 51 that defines the cavity 80.

[0024] The step portion 13 includes a rising portion 13a and a shelf portion 13b. The rising portion 13a is configured to rise from the sole portion 50. The shelf portion 13b is connected to the tip of the rising portion 13a. The shelf portion 13b is configured in a flat shape. The shelf portion 13b is configured so that the high-specific-gravity member 2 can be placed thereon. The shelf portion 13b is within the width of the scoreline 11a in the toe-heel direction TH.

[0025] The high specific gravity member 2 has a higher specific gravity than the head body 1. In other words, the specific gravity of the high specific gravity member 2 is higher than the specific gravity of the entire head body 1. The material of the high specific gravity member 2 is, for example, a tungsten alloy. The high specific gravity member 2 is placed on the step portion 13. The high specific gravity member 2 is fixed to the shelf surface portion 13b of the step portion 13. Specifically, the high specific gravity member 2 is fixed to the shelf surface portion 13b of the step portion 13 by a method such as adhesive, brazing, or welding. Note that the high specific gravity member 2 is not fixed to the head body 1 on the side opposite to the shelf surface portion 13b. In other words, the upper surface of the high specific gravity member 2 is not fixed to the head body 1.

[0026] The high specific gravity member 2 is arranged with a space S between it and the sole portion 50 in the top sole direction TS where the top edge portion 40 and the sole portion 50 face each other. Specifically, the high specific gravity member 2 is arranged with a space S between it and the thin sole portion 51 in the top sole direction TS where the top edge portion 40 and the sole portion 50 face each other. The high specific gravity member 2 is arranged with a space S between it and the inner surface of the sole portion 50. The shelf portion 13b is located near the sole portion 50 in the top sole direction TS. Specifically, the shelf portion 13b is arranged at a position 15 mm or less from the ground surface of the sole portion 50.

[0027] The high specific gravity member 2 is configured to protrude from the step portion 13 toward the back surface 12. Specifically, the high specific gravity member 2 is configured to protrude from the rising portion 13a toward the back surface 12. It is preferable that the lower surface 2a of the high specific gravity member protruding portion is parallel to the inner surface 52 of the thin-walled portion 51, or that the angle on the face side between the lower surface 2a of the high specific gravity member protruding portion and a perpendicular line erected on the inner surface 52 of the thin-walled portion 51 is 90 degrees or less.

[0028] As shown in FIGS. 4 to 8 , the length of the space S between the high specific gravity member 2 and the sole portion 50 varies in the top-sole direction TS. In the toe-heel direction TH in which the toe portion 20 and the heel portion 30 face each other, the high specific gravity member 2 includes a toe side portion 21 disposed near the toe portion 20, a heel side portion 22 disposed near the heel portion 30, and a central portion 23 disposed between the toe side portion 21 and the heel side portion 22. The toe side portion 21 is disposed at an end of the high specific gravity member 2 on the toe portion 20 side in the toe-heel direction TH. The heel side portion 22 is disposed at an end of the high specific gravity member 2 on the heel portion 30 side in the toe-heel direction TH. The central portion 23 is disposed in the center of the high specific gravity member 2 in the toe-heel direction TH.

[0029] In the top-sole direction TS, the length (first length) L1 of the space S between the toe side portion 21 and the sole portion 50 and the length (second length) L2 of the space S between the heel side portion 22 and the sole portion 50 are each longer than the length (third length) L3 of the space S between the central portion 23 and the sole portion 50. The first length L1 is, for example, 2.5 mm. The second length L2 is, for example, 2.5 mm. The third length L3 is, for example, 2.1 mm.

[0030] The step portion 13 includes, in the toe-heel direction TH, a first portion 131 disposed near the toe portion 20, a second portion 132 disposed near the heel portion 30, and a third portion 133 disposed between the first portion 131 and the second portion 132. In the face-back direction FB, the shortest distance (first distance) D1 between the back surface 12 and the first portion 131 and the shortest distance (second distance) D2 between the back surface 12 and the second portion 132 are each longer than the shortest distance (third distance) D3 between the back surface 12 and the third portion. The first distance D1 is, for example, 7.8 mm. The second distance D2 is, for example, 7.4 mm. The third distance D3 is, for example, 6.0 mm.

[0031] In the face-back direction FB, the width (first width) W1 of the thin portion 51 between the back surface 12 and the first portion 131 and the width (second width) W2 of the thin portion 51 between the back surface 12 and the second portion 132 are each larger than the width (second width) W3 of the thin portion 51 between the back surface 12 and the third portion 133. The first width W1 is, for example, 7.8 mm. The second width W2 is, for example, 7.4 mm. The third width W3 is, for example, 6.0 mm.

[0032] The first length L1 and the second length L2 may be longer than the third length L3, and the first distance D1, the second distance D2, and the third distance D3 may be the same. Alternatively, the first length L1, the second length L2, and the third length L3 may be the same, and the first distance D1 and the second distance D2 may be longer than the third distance D3.

[0033] 2 and 9, an iron golf club 200 according to an embodiment will be described. The iron golf club 200 is configured by combining the iron golf club head 100 with a shaft 201 and a grip 202. The shaft 201 and the grip 202 may be well-known.

[0034] 9, an iron golf club 200 according to the embodiment includes an iron golf club head 100 according to the embodiment, a shaft 201, and a grip 202. The iron golf club head 100 is attached to the shaft 201. The grip 202 is attached to the shaft 201.

[0035] 2 and 9, specifically, the shaft 201 has one end and the other end. The iron golf club head 100 is attached to one end of the shaft 201. The shaft 201 is attached to a hosel portion 60 of the iron golf club head 100. One end of the shaft 201 is inserted into the hosel portion 60. The grip 202 is attached to the other end of the shaft 201. The other end of the shaft 201 is inserted into the grip 202.

[0036] Next, the effects of the embodiment will be described.

[0037] According to the iron golf club head 100 of this embodiment, the high specific gravity member 2 is placed on the step portion 13, which is disposed with a gap from the back surface 12 in the face-back direction FB. This allows for a lower center of gravity. Furthermore, the high specific gravity member 2 is disposed with a space S between it and the sole portion 50 in the top-sole direction TS, in which the top edge portion 40 and the sole portion 50 face each other. Therefore, the high specific gravity member 2 does not easily suppress the bending of the sole portion 50, so the sole portion 50 easily bends. This allows for a reduction in the coefficient of restitution to be suppressed. As described above, a lower center of gravity can be achieved and a reduction in the coefficient of restitution to be suppressed.

[0038] Moreover, the high specific gravity member 2 is configured to protrude from the step portion 13 toward the back surface 12. Therefore, the adhesive area of ​​the high specific gravity member 2 and the head body 1 can be reduced.

[0039] According to the iron golf club head 100 according to the embodiment, in the top-sole direction TS, the length (first length) L1 of the space S between the toe side portion 21 and the sole portion 50 and the length (second length) L2 of the space S between the heel side portion 22 and the sole portion 50 are each longer than the length (third length) L3 of the space S between the central portion 23 and the sole portion 50. This makes it possible to suppress a decrease in the restitution coefficient, particularly on the toe portion 20 side and the heel portion 30 side. This therefore makes it possible to suppress a decrease in the flight distance on off-center shots, particularly on the toe portion 20 side and the heel portion 30 side.

[0040] According to the iron golf club head 100 according to the embodiment, in the face-back direction FB, the distance (first distance) D1 between the back surface 12 and the first portion 131 and the distance (second distance) D2 between the back surface 12 and the second portion 132 are each longer than the distance (third distance) D3 between the back surface 12 and the third portion. This makes it possible to further suppress the decrease in the restitution coefficient, particularly on the toe portion 20 side and the heel portion 30 side. This therefore makes it possible to further suppress the decrease in flight distance, particularly on the toe portion 20 side and the heel portion 30 side, on off-center shots.

[0041] According to the iron golf club head 100 according to the embodiment, the face portion 10 and the hosel portion 60 are made of the same material. Therefore, the face portion 10 and the hosel portion 60 can be manufactured in the same process.

[0042] In the iron golf club head 100 according to the embodiment, the face portion 10 and the hosel portion 60 are made of nickel chrome molybdenum steel. This makes the face portion 10 harder, improving durability, and also makes it possible to design the face portion 10 thinner, improving repulsion.

[0043] The iron golf club 200 according to the embodiment includes the iron golf club head 100 according to the embodiment. Therefore, it is possible to provide the iron golf club 200 that can achieve a low center of gravity and suppress a decrease in the restitution coefficient.

[0044] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0045] 1 head body, 2 high specific gravity member, 10 face portion, 11 face surface, 11a score line, 12 back surface, 13 step portion, 13a rising portion, 13b shelf portion, 20 toe portion, 21 toe side portion, 22 heel side portion, 23 center portion, 30 heel portion, 40 top edge portion, 50 sole portion, 60 hosel portion, 70 cavity wall portion, 80 cavity, 100 iron golf club head, 131 first portion, 132 second portion, 133 third portion, 200 iron golf club, FB face-back direction, G gap, S space, TH toe-heel direction, TS top-sole direction.

Claims

1. A head body, a high-specific-gravity member having a specific gravity higher than that of the head body, The head body includes: a face portion having a face surface and a back surface; a toe portion continuous with the face portion; a heel portion that is continuous with the face portion and faces the toe portion across the face portion; a top edge portion continuous with the face portion; a sole portion that is continuous with the face portion and faces the top edge portion across the face portion; a step portion disposed with a gap from the back surface in a face-back direction in which the face surface and the back surface face each other, the high-specific-gravity member is placed on the step portion, and is arranged with a space between the high-specific-gravity member and the sole portion in a top-sole direction in which the top edge portion and the sole portion face each other.

2. the step portion includes, in a toe-heel direction in which the toe portion and the heel portion face each other, a first portion disposed near the toe portion, a second portion disposed near the heel portion, and a third portion disposed between the first portion and the second portion, 2. The iron golf club head according to claim 1, wherein in the face-back direction, a distance between the back surface and the first portion and a distance between the back surface and the second portion are each longer than a distance between the back surface and the third portion.

3. the high-specific-gravity member includes, in a toe-heel direction in which the toe portion and the heel portion face each other, a toe side portion disposed near the toe portion, a heel side portion disposed near the heel portion, and a central portion disposed between the toe side portion and the heel side portion, 3. The iron golf club head according to claim 1, wherein, in the top-sole direction, the length of the space between the toe side portion and the sole portion and the length of the space between the heel side portion and the sole portion are each longer than the length of the space between the central portion and the sole portion.

4. the head body includes a hosel portion, The iron golf club head according to claim 1 , wherein the face portion and the hosel portion are made of the same material.

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