Golf club heads, golf club sets

Abstract

To provide a cavity iron golf club head compatibly attaining good shot feeling and performances.SOLUTION: A golf club head is a cavity iron golf club head comprising a face part, a cavity part provided on the back face side of the face part, and a bulge part provided at the bottom of the back face. The bulge part includes a first recess recessed from an upper face of the bulge part to a sole side, a second recess provided at a toe side with respect to the first recess and recessed from the upper face of the bulge part to the toe side, and a thick wall part provided between the first recess and the second recess in a toe-heel direction. The first recess and the second recess have a substantially trapezoidal shape in a cross-sectional view cut along a plane parallel to the front face of the face part and passing through deepest parts of the first recess and the second recess. The first recess and the second recess gradually deepen from the toe side to the heel side, and the thick wall part is located on a back side of a center line of a score line.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a golf club head and a golf club set. [Background technology]

[0002] In the past, a cavity iron golf club head has been proposed in which, for example, a bulge provided at the bottom of the back surface of the face has a recessed portion recessed from the top surface of the bulge toward the sole. However, even if the recessed portion improves performance, it can sometimes impair the feel of the impact by reducing the thickness of the face around the impact point. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2002 / 032514 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-289105 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-235828 [Patent Document 4] Japanese Patent Application Laid-Open No. 2014-217668 [Patent Document 5] Japanese Patent Application Laid-Open No. 2014-195584 Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE INVENTION An object of the present invention is to provide a cavity iron type golf club head that combines good feel with excellent performance. [Means for solving the problem]

[0005] The golf club head is a cavity iron type golf club head including a face portion, a cavity portion provided on the back side of the face portion, and a bulge portion provided on a lower part of the back surface, wherein the bulge portion has a first recess portion recessed from an upper surface of the bulge portion toward the sole side, a second recess portion provided on the toe side of the first recess portion and recessed from an upper surface of the bulge portion toward the sole side, and a thick portion provided between the first recess portion and the second recess portion in a toe-heel direction, wherein the first recess portion and the second recess portion have a substantially trapezoidal shape in a cross section taken along a plane parallel to the front surface of the face portion and passing through the deepest portions of the first recess portion and the second recess portion, and the first recess portion and the second recess portion are gradually deeper from the toe side to the heel side, the bottom surfaces of the first recess and the second recess are located on the same plane; The thick portion is located on the back side of the center line of the scoreline. [Effects of the Invention]

[0006] According to the disclosed technology, it is possible to provide a cavity iron type golf club head that combines good hitting feel with excellent performance. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view illustrating a golf club head according to an embodiment of the present invention. [Figure 2] 1 is a perspective view illustrating a golf club head according to an embodiment of the present invention. [Figure 3] 1 is a cross-sectional view illustrating a golf club head according to an embodiment of the present invention. [Figure 4] FIG. 4 is a rear view illustrating a first recess and a second recess. [Figure 5] 1 is a diagram illustrating a golf club set according to an embodiment of the present invention; [Figure 6] FIG. 10 is a rear view showing a 9 iron as an example of the third golf club. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, the embodiments will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

[0009] [Golf club head] FIG. 1 is a front view illustrating a golf club head according to this embodiment. FIG. 2 is a perspective view illustrating a golf club head according to this embodiment, as viewed from diagonally above the rear of the golf club head. FIG. 3 is a cross-sectional view illustrating a golf club head according to this embodiment, showing a vertical cross section cut in the face-back direction so as to pass through a second recess 122 described below. FIG. 4 is a rear view illustrating the first recess and the second recess. Note that FIG. 4 schematically illustrates the first recess and the second recess.

[0010] 1 shows a case where the golf club head 1 is grounded on a horizontal plane H (corresponding to the ground) according to a standard lie angle and a standard loft angle. Also, in each figure, arrows d1, d2, and / or d3 are shown as necessary. Arrow d1 indicates the toe-heel direction (left-right direction), arrow d2 indicates the top-sole direction (up-down direction), and arrow d3 indicates the face-back direction (front-back direction).

[0011] The golf club head 1 shown in Figures 1 to 4 is a cavity back iron type golf club head. The golf club head 1 can be used for any of long irons, middle irons, short irons, and wedges. Note that Figures 1 to 4 show a number 6 iron, which is a middle iron, as an example.

[0012] The golf club head 1 can be formed using metal materials such as, for example, mild steel, stainless steel, titanium, aluminum, chrome molybdenum steel, etc. The golf club head 1 can be manufactured by, for example, but not limited to, forging, casting, machining, or a combination of these methods.

[0013] The golf club head 1 includes a face portion 11, a bulge portion 12, a sole portion 13, a top portion 14, and a hosel portion 15. The face portion 11 has a face surface 11f, which serves as a striking surface for striking a ball, and a back surface 11h located on the opposite side of the face surface 11f. The face portion 11 has a predetermined thickness. The face surface 11f may also be referred to as the front surface.

[0014] On the face surface 11f, a plurality of scorelines 11s (grooves recessed from the face surface 11f toward the back surface 11h) with their longitudinal direction in the toe-heel direction are arranged at predetermined intervals in the top-sole direction. Each scoreline 11s is parallel to the horizontal plane H. In the face portion 11, the area where the scorelines 11s are formed on the face surface 11f is the part that hits the golf ball. Note that Sc indicates the center line of the scorelines 11s. The center line Sc passes through the center in the toe-heel direction of the scoreline 11s closest to the sole side and is perpendicular to each scoreline 11s.

[0015] A cavity portion 16 is provided on the back surface 11h side of the face portion 11. More specifically, a thick portion is provided to surround the periphery of the back surface 11h of the face portion 11, and a thin cavity portion 16 is provided in the center. The thickness of the face portion 11 located within the cavity portion 16 may or may not be constant. In the example shown in FIG. 3, the thickness of the face portion 11 located within the cavity portion 16 increases in three stages as it approaches the sole side. That is, within the cavity portion 16, a first portion 111, a second portion 112, and a third portion 113 of the face portion 11 are sequentially arranged from the top side to the sole side. The second portion 112 is thicker than the first portion 111 of the face portion 11, and the third portion 113 is even thicker than the second portion 112. In this way, by increasing the thickness of the face portion 11 located within the cavity portion 16 as it approaches the sole side, the center of gravity of the golf club head 1 can be lowered.

[0016] A bulge 12 is provided at the bottom of the back surface 11h of the face portion 11. The bulge 12 forms part of the back surface of the golf club head 1. The bulge 12 protrudes further back than the face portion 11 below the back surface 11h. The bulge 12 extends from the toe side to the heel side. When viewed in the top-sole direction, the bulge 12 extends further back than the cavity portion 16. The bulge 12 has an upper surface 12a.

[0017] The sole portion 13 is a portion that forms the bottom of the golf club head 1. The top portion 14 is a portion that extends rearward from the upper edge of the face portion 11. The top portion 14 is disposed so as to face a part of the bulge portion 12 in the top-sole direction, with the cavity portion 16 in between. The top portion 14 extends from the toe side to the heel side. The hosel portion 15 is a portion that is connected to the shaft.

[0018] The bulge portion 12 has a first recess 121, a second recess 122, and a thick portion 123. The first recess 121 is provided closer to the heel than the second recess 122, and is recessed from the upper surface 12a of the bulge portion 12 toward the sole side. The second recess 122 is provided closer to the toe than the first recess 121, and is recessed from the upper surface 12a of the bulge portion 12 toward the sole side. The first recess 121 and the second recess 122 are arranged with their longitudinal directions facing the toe-heel direction.

[0019] In this way, by providing the first recess 121 and the second recess 122 in the bulge portion 12, it is possible to reduce the weight of the golf club head 1. Therefore, it is possible to increase the size of the golf club head 1 without increasing the overall weight of the golf club head 1. In addition, it is possible to increase the weight of the toe side and heel side of the golf club head 1 without increasing the overall weight of the golf club head 1, thereby widening the sweet spot of the golf club head 1.

[0020] The thick portion 123 has an upper surface 123a. The upper surface 123a of the thick portion 123 forms part of the upper surface 12a of the bulge portion 12. The thick portion 123 is a portion closer to the sole than the upper surface 123a. The thick portion 123 is provided between the first recessed portion 121 and the second recessed portion 122 in the toe-heel direction. The thick portion 123 is located on the back side of the center line Sc of the scoreline 11s.

[0021] In this way, in the bulge portion 12, the thick portion 123, which is thicker than the area where the first recess 121 and the second recess 122 are provided, is located on the back side of the center line Sc of the score line 11s, thereby improving the hitting feel when hitting a golf ball near the center of the face surface 11f.

[0022] 4, the first recess 121 and the second recess 122 are arranged so as to each have a substantially trapezoidal shape extending in the toe-heel direction when the back surface 11h side of the face portion 11 is seen through from a direction perpendicular to the face surface 11f. In other words, the first recess 121 and the second recess 122 have a substantially trapezoidal shape in a cross-sectional view taken along a plane parallel to the face surface 11f of the face portion 11 and passing through the deepest parts of the first recess 121 and the second recess 122.

[0023] The width in the toe-heel direction of each of the first recess 121 and the second recess 122 is widest on the upper surface 12a side of the bulge 12 and gradually decreases toward the sole side. The width in the face-back direction of each of the first recess 121 and the second recess 122 is approximately constant. The width in the face-back direction of the first recess 121 is approximately equal to the width in the face-back direction of the second recess 122.

[0024] The term "substantially" trapezoidal shape refers to a configuration in which the paired surfaces of the "upper surface 12a and the first bottom surface 121a of the first recess" and the "upper surface 12a and the second bottom surface 122a of the second recess," which correspond to the upper and lower bases of the trapezoid, are not parallel to each other. Specifically, this includes a configuration in which the upper and lower bases are inclined within a range of ±10 degrees. The upper and lower bases, the lower and / or legs may or may not be completely straight. For example, the upper and / or lower bases may have a partial undulation or may have an R-shaped end. The first and second recesses 121 and 122 may have the upper surface 12a of the bulge portion 12 slightly curved toward the top at the heel-side end of the first recess 121 and the toe-side end of the second recess 122 to match the shape of the cavity portion 16, as shown in FIG. 4 .

[0025] In Figure 4, A1 denotes an imaginary plane extending from the upper surface 123a of the thick portion 123 in the toe-heel direction. A2 denotes an imaginary plane inclined relative to the imaginary plane A1. The distance between the imaginary planes A1 and A2 is narrowest on the toe side and gradually increases toward the heel side. Specifically, the inclination angle of the imaginary plane A1 relative to the imaginary plane A2 is preferably greater than 0 degrees and less than 10 degrees, and more preferably greater than 1 degree and less than 5 degrees.

[0026] The first recess 121 and the second recess 122 are gradually deeper from the toe side toward the heel side. By forming the first recess 121 and the second recess 122 in this shape, the moment of inertia can be increased. As a result, when hitting a golf ball with the golf club head 1, even if the hit is made at a position away from the center of gravity of the golf club head 1, wobble of the golf club head 1 can be suppressed, thereby reducing deviation or curvature of the launch direction, loss of distance, etc.

[0027] The first bottom surface 121a of the first recess 121 and the second bottom surface 122a of the second recess 122 may be inclined with respect to the imaginary plane A1. In this case, the first bottom surface 121a of the first recess 121 and the second bottom surface 122a of the second recess 122 may be located on the same plane as the imaginary plane A2. However, this is just one example, and as long as the first recess 121 and the second recess 122 gradually become deeper from the toe side to the heel side, the first bottom surface 121a of the first recess 121 and the second bottom surface 122a of the second recess 122 do not have to be located on the same plane. Note that, if the first bottom surface 121a and the second bottom surface 122a are curved, 121a and 122a indicated by dashed lines in FIG. 4 indicate the deepest positions on the bottom surfaces.

[0028] By forming the first recess 121 and the second recess 122 into a substantially trapezoidal shape and tilting the first bottom surface 121a of the first recess 121 and the second bottom surface 122a of the second recess 122 with respect to the imaginary plane A1, it is possible to fine-tune the function and feel of the club. For example, in the first recess 121, the moment of inertia and feel of the club can be varied by adjusting the tilt angle of the inner wall surface 121b on the toe side and / or heel side with respect to the upper surface 123a of the thick portion 123 shown in FIG. 4. Similarly, in the second recess 122, the moment of inertia and feel of the club can be varied by adjusting the tilt angle of the inner wall surface 122b on the toe side and / or heel side with respect to the upper surface 123a of the thick portion 123 shown in FIG. 4.

[0029] 3, in a cross section cut in the face-back direction, the inner wall surfaces on the face side and the inner wall surfaces on the back side of the first recess 121 and the second recess 122 may be non-parallel to the face surface 11f of the face portion 11. By doing so, the depth of the center of gravity of the golf club head 1 can be made deeper.

[0030] 3, the inner wall surfaces on the face side and the back side of the second recess 122 are non-parallel to the face surface 11f and are inclined so that the closer they are to the sole side, the closer they are to the face portion 11. The inner wall surfaces of the first recess 121 can also be inclined in the same direction as the inner wall surfaces of the second recess 122.

[0031] When the distance in the face-back direction from the face surface 11f of the face portion 11 to the face-side ends of the first recessed portion 121 and the second recessed portion 122 is L1 and the face-back length is L2, it is preferable that the value of L1 / L2 × 100 is 20% or more and 30% or less. Within this range, the first recessed portion 121 and the second recessed portion 122 can be located closer to the face portion 11 in the face-back direction. This allows the depth of the center of gravity of the golf club head 1 to be deeper. The face-back length is the length of the longest part from the face surface 11f to the back-side end when measured in a direction perpendicular to the face surface 11f.

[0032] [Golf club set] Fig. 5 is a diagram illustrating a golf club set according to this embodiment. The golf club set 2 shown in Fig. 5 is a golf club set having a plurality of golf clubs each equipped with a cavity iron type golf club head 1, and includes a first golf club 21, a second golf club 22, and a third golf club 23.

[0033] The first golf club 21 is one or more golf clubs equipped with a golf club head 1 having a loft angle of 23 degrees or more and 30 degrees or less. The second golf club 22 is one or more golf clubs equipped with a golf club head 1 having a loft angle of 30.5 degrees or more and 39 degrees or less. The third golf club 23 is one or more golf clubs equipped with a golf club head 1 having a loft angle of 39.5 degrees or more. The first golf club 21, the second golf club 22, and the third golf club 23 may have the same lie angle.

[0034] Furthermore, the first golf club 21, the second golf club 22, and the third golf club 23 each include a shaft 28 and a grip 29 in addition to the golf club head 1. The golf club head 1 is attached to one end of the shaft 28, and the grip 29 is attached to the other end of the shaft 28.

[0035] The first golf club 21 is, for example, a 5 iron, the second golf club 22 is, for example, a 7 iron, and the third golf club 23 is, for example, a 9 iron. However, this is just an example, and the first golf club 21, the second golf club 22, and the third golf club 23 may include a plurality of golf clubs within the above loft angle range.

[0036] For example, the first golf club 21 may include a 4-iron, a 5-iron, and a 6-iron, the second golf club 22 may include a 7-iron and an 8-iron, and the third golf club 23 may include a 9-iron and a pitching wedge.

[0037] Fig. 6 is a rear view showing a 9-iron as an example of a third golf club. The golf club head 1 of the third golf club 23 shown in Fig. 6 has a wider toe-heel direction upper surface 123a of the thick portion 123 than the golf club head 1 of the second golf club 22 shown in Fig. 4. Similarly, the golf club head 1 of the second golf club 22 has a wider toe-heel direction upper surface 123a of the thick portion 123 than the golf club head 1 of the first golf club 21.

[0038] That is, in the golf club set 2, the width in the toe-heel direction of the upper surface 123a of the thick portion 123 of the golf club head 1 satisfies the relationship of the third golf club 23 > the second golf club 22 > the first golf club 21. As a result, the larger the loft angle of the golf club, the more improved the hitting feel when hitting the golf ball. Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims. [Explanation of symbols]

[0039] 1 golf club head 2 golf club sets 11 Face 11f face 11h Back of face 11s scoreline 12 Bulge 12a Top side 13 Sole 14 Top section 15 Hosel section 16 Cavity 21 First Golf Club 22 Second Golf Club 23 The Third Golf Club 28 shaft 29 Grip 111 Part 1 112 Part 2 113 Part 3 121 First recess 121a 1st bottom 121b,122b Inner wall surface 122 Second recess 122a 2nd bottom 123 Thick part 123a Top side

Claims

1. A cavity iron type golf club head including a face portion, a cavity portion provided on a back surface side of the face portion, and a bulge portion provided on a lower portion of the back surface, The bulging portion is a first recess recessed from an upper surface of the bulging portion toward the sole; a second recess provided closer to the toe side than the first recess and recessed from the upper surface of the bulge portion toward the sole side; a thick portion provided between the first recess and the second recess in a toe-heel direction, the first recess and the second recess have a substantially trapezoidal shape in a cross section taken along a plane parallel to a front surface of the face portion and passing through deepest portions of the first recess and the second recess, the first recess and the second recess are gradually deepened from the toe side toward the heel side, the bottom surfaces of the first recess and the second recess are located on the same plane; The thick portion is located on the back side of the center line of the score line.

2. 2. The golf club head according to claim 1, wherein the face portion located within the cavity portion has three thickness levels.

3. 3. The golf club head according to claim 1, wherein the thickness of the face portion located within the cavity portion increases as it goes toward the sole side.

4. 4. The golf club head according to claim 1, wherein a first bottom surface of the first recess and a second bottom surface of the second recess are each inclined with respect to an imaginary plane extending in a toe-heel direction from an upper surface of the thick portion.

5. 5. The golf club head according to claim 1, wherein, in a cross-sectional view cut in a face-back direction, inner wall surfaces on the face side and inner wall surfaces on the back side of the first recess and the second recess are non-parallel to a front surface of the face portion.

6. 6. The golf club head according to claim 1, wherein a value of L1 / L2×100 is 20% or more and 30% or less, where L1 is a distance in a face-back direction from a front surface of the face portion to the end portions of the first recess and the second recess on the face side, and L2 is a face-back length.

7. A golf club set having a plurality of golf clubs each having a cavity iron type golf club head, The plurality of golf clubs include: one or more first golf clubs each having a golf club head with a loft angle of 23 degrees or more and 30 degrees or less; one or more second golf clubs each having a golf club head 1 with a loft angle of 30.5 degrees or more and 39 degrees or less; one or more third golf clubs each having a golf club head 1 with a loft angle of 39.5 degrees or more; The golf club head of each of the first golf club, the second golf club, and the third golf club comprises: a face portion; a cavity portion provided on a rear surface side of the face portion; and a bulge portion provided on a lower portion of the rear surface, The bulging portion is a first recess recessed from an upper surface of the bulging portion toward the sole; a second recess provided closer to the toe side than the first recess and recessed from the upper surface of the bulge portion toward the sole side; a thick portion provided between the first recess and the second recess in a toe-heel direction, the first recess and the second recess have a substantially trapezoidal shape in a cross section taken along a plane parallel to a front surface of the face portion and passing through deepest portions of the first recess and the second recess, the first recess and the second recess are gradually deepened from the toe side toward the heel side, the bottom surfaces of the first recess and the second recess are located on the same plane; the thick portion is located on the back side of the center line of the score line, The golf club set, wherein the width of the upper surface of the thick portion in the toe-heel direction satisfies the relationship of the third golf club > the second golf club > the first golf club.

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