Golf club head

Abstract

This product provides a golf club head that delivers a pleasant sound and feel upon impact, while also suppressing the deterioration of the resin composite's durability. [Solution] The golf club head has a head body that includes a face portion and a pocket portion located on the sole side of the back of the face portion and opening to the top side, and a resin composite disposed inside the pocket portion, the resin composite including a first resin portion and a second resin portion having a higher hardness than the first resin portion, the first resin portion being provided with a through hole, the second resin portion being inserted into the through hole and in contact with the back of the face portion and the inner wall surface of the pocket portion facing the back.

Description

Technical Field

[0001] The present invention relates to a golf club head.

Background Art

[0002] In a golf club head, for example, a structure is known in which a recess is provided on the back side and a tuning element can be inserted into the recess. Since the golf club head strikes a golf ball, high durability is required. Also, the hitting sound and hitting feeling when hitting a golf ball are important, and it is required to achieve a comfortable hitting sound and hitting feeling desired by a golfer.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a golf club head that can achieve a comfortable hitting sound and hitting feeling and suppress a decrease in durability of a resin composite.

Means for Solving the Problems

[0005] The golf club head includes a head main body portion including a face portion and a pocket portion located on the sole side of the back surface of the face portion and opening to the top side, and a resin composite disposed inside the pocket portion. The resin composite includes a first resin portion and a second resin portion having a higher hardness than the first resin portion. A through hole is provided in the first resin portion, and the second resin portion is inserted into the through hole and is in contact with the back surface of the face portion and the inner wall surface of the pocket portion facing the back surface.

Effects of the Invention

[0006] According to the disclosed technology, it is possible to provide a golf club head that achieves a pleasant sound and feel at impact while suppressing the deterioration of the durability of the resin composite. [Brief explanation of the drawing]

[0007] [Figure 1] This is a front view (part 1) illustrating a golf club head according to this embodiment. [Figure 2] This is a front view (part 2) illustrating a golf club head according to this embodiment. [Figure 3] This is a rear view (part 1) illustrating the golf club head according to this embodiment. [Figure 4] This is a rear view (part 2) illustrating the golf club head according to this embodiment. [Figure 5] This is a cross-sectional view illustrating a golf club head according to this embodiment. [Figure 6] This is a perspective view illustrating the resin composite that constitutes the golf club head according to this embodiment. [Figure 7] This is a perspective view illustrating the second resin portion constituting the resin composite according to this embodiment. [Modes for carrying out the invention]

[0008] The embodiments will be described below with reference to the drawings. In each drawing, the same components are denoted by the same reference numerals, and redundant explanations may be omitted.

[0009] Figure 1 is a front view (part 1) illustrating a golf club head according to this embodiment. Figure 2 is a front view (part 2) illustrating a golf club head according to this embodiment, in which the face portion 11 is made transparent compared to Figure 1. Figure 3 is a rear view (part 1) illustrating a golf club head according to this embodiment. Figure 4 is a rear view (part 2) illustrating a golf club head according to this embodiment, in which the three-dimensional resin nameplate 30 is made transparent compared to Figure 3. Figure 5 is a cross-sectional view illustrating a golf club head according to this embodiment.

[0010] Figures 1 and 2 illustrate the case where the golf club head 1 is placed on the horizontal plane H (corresponding to the ground) according to the standard lie angle and standard loft angle. In each figure, arrows d1, d2, and / or d3 are shown as needed. 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 5 is an iron-type golf club head. Golf club head 1 can be used for long irons, mid-irons, short irons, and wedges.

[0012] The golf club head 1 has a minimum configuration consisting of a head body 10 and a resin composite 20. In the illustrated example, the golf club head 1 further includes a three-dimensional resin nameplate 30.

[0013] The head body 10 includes a face portion 11, a pocket portion 12, a cavity portion 13, a sole portion 14, a top portion 15, and a hosel portion 16. The head body 10 may further include other parts.

[0014] The head body portion 10 can be formed using a metal material such as mild steel, stainless steel, titanium, aluminum, or chromium-molybdenum steel. The specific gravity of the head body portion 10 is, for example, 7 to 9. The head body portion 10 can be manufactured by, but is not limited to, forging, casting, machining, or a combination thereof.

[0015] The face portion 11 has a face surface 11f that serves as a striking surface for hitting the ball and a back surface 11h located on the opposite side of the face surface 11f. Further, the face portion 11 has a plurality of score lines 11s extending in the toe-heel direction. The score lines 11s are grooves that are recessed from the face surface 11f toward the back surface 11h side. The score lines 11s are arranged at substantially equal intervals in the top-sole direction. Each score line 11s is parallel to the horizontal plane H. In the present application, parallel and perpendicular are each allowed to have an error of ±5 degrees.

[0016] In the face portion 11, the region where the score lines 11s are formed on the face surface 11f becomes the part for hitting the ball. The face portion 11 has a predetermined thickness. The thickness of the thinnest part of the face portion 11 without considering the score lines 11s is, for example, 1.6 mm or more and 2.1 mm or less.

[0017] A recess 10x may be provided in the face portion 11. By providing the recess 10x, it is possible to adjust the weight of the golf club head, and it is possible to adjust the optimal center of gravity according to the club number.

[0018] The pocket portion 12 is located on the sole side of the back surface 11h of the face portion 11 and opens to the top side. The pocket portion 12 has a length in the toe-heel direction that is longer than the length in the face-back direction. The pocket portion 12 has a length in the top-sole direction that is longer than the length in the face-back direction. The length of the pocket portion 12 in the toe-heel direction is shorter than the length of the sole portion 14 in the toe-heel direction.

[0019] The cavity portion 13 is located on the top side of the back surface 11h of the face portion 11. That is, the cavity portion 13 is located on the top side of the pocket portion 12. The cavity portion 13 extends in the toe-heel direction. Also, the cavity portion 13 extends in the top-sole direction from the top side to the position of the pocket portion 12. The length of the cavity portion 13 in the toe-heel direction is longer than the length of the pocket portion 12 in the toe-heel direction. Note that the head main body portion 10 may not include the cavity portion 13.

[0020] The sole portion 14 is the part that forms the bottom of the golf club head 1. The top portion 15 is the part that extends rearward from the upper edge of the face portion 11. The top portion 15 is arranged to face a part of the sole portion 14 across the pocket portion 12 and the cavity portion 13 in the top-sole direction. The top portion 15 extends from the toe side to the heel side. The hosel portion 16 is the part connected to the shaft.

[0021] The resin composite 20 is arranged inside the pocket portion 12. The resin composite 20 is fixed inside the pocket portion 12 with, for example, an adhesive. The specific gravity of the resin composite 20 is, for example, 0.5 or more and 1.5 or less. The weight of the resin composite 20 is, for example, 5 g or more and 7 g or less. There may be a gap between the resin composite 20 and the bottom of the pocket portion 12.

[0022] The resin composite 20 includes a first resin portion 21 and a second resin portion 22 that is harder than the first resin portion 21. The hardness of the first resin portion 21 is, for example, A40 or more and A60 or less, and the hardness of the second resin portion 22 is, for example, A80 or more and A100 or less. It is more preferable that the hardness of the first resin portion 21 is A50 or more and A60 or less, and the hardness of the second resin portion 22 is A90 or more and A100 or less. It is even more preferable that the hardness of the first resin portion 21 is A40 or more and A50 or less, and the hardness of the second resin portion 22 is A80 or more and A90 or less. The hardness can be measured in accordance with JIS K6253-3:2012.

[0023] The three-dimensional resin nameplate 30 is arranged inside the cavity portion 13. The three-dimensional resin nameplate 30 is fixed inside the cavity portion 13 with, for example, a double-sided tape. A part of the three-dimensional resin nameplate 30 may be located outside the cavity portion 13. The three-dimensional resin nameplate 30 is, for example, a three-dimensional shape with a flat surface on the side of the cavity portion 13 and unevenness on the surface opposite to the cavity portion 13. At least a part of the three-dimensional resin nameplate 30 contacts the resin composite 20. By at least a part of the three-dimensional resin nameplate 30 contacting the resin composite 20, an effect of preventing the resin composite 20 from falling off the golf club head can be obtained.

[0024] The specific gravity of the three-dimensional resin nameplate 30 is, for example, 0.8 to 1.8. The weight of the three-dimensional resin nameplate 30 is, for example, 2g to 6g. The three-dimensional resin nameplate 30 can be formed from, for example, ABS resin.

[0025] Figure 6 is a perspective view illustrating a resin composite that constitutes the golf club head according to this embodiment. Figure 7 is a perspective view illustrating a second resin portion that constitutes the resin composite according to this embodiment.

[0026] As shown in Figure 6, the first resin portion 21 has, for example, a central region 21a near the center in the toe-heel direction, where the thickness in the face-back direction is approximately constant, and the thickness in the face-back direction gradually decreases as it moves from the central region 21a toward the toe and heel sides. The shape of the first resin portion 21 may be, for example, a square pyramid that can be placed inside the pocket portion 12.

[0027] The first resin part 21 is provided with through holes 21x. The through holes 21x can be provided, for example, in the central region 21a of the first resin part 21. The number of through holes 21x may be one or two or more, but in the example of Figure 6, three through holes 21x are provided. The multiple through holes 21x can be arranged, for example, at predetermined intervals in the toe-heel direction. The shape of each through hole 21x is, for example, circular when viewed in the face-back direction. It is preferable that one of the multiple through holes 21x coincides with the center of the face part 11 when viewed in the face-back direction. Here, the center of the face part 11 is a straight line on the face surface 11f that passes through the midpoint of the longest scoreline 11s and is perpendicular to the scoreline 11s.

[0028] As shown in Figure 7, the second resin part 22 is, for example, elongated with the face-back direction as its longitudinal direction. The second resin part 22 comprises, for example, a first cylindrical part 22a and a second cylindrical part 22b provided on one side of the first cylindrical part 22a. The second cylindrical part 22b has a smaller diameter than the first cylindrical part 22a and is provided concentrically with the first cylindrical part 22a. The diameters of the first cylindrical part 22a and the second cylindrical part 22b are, for example, 3 mm to 8 mm. The axial length of the second resin part 22 is approximately equal to the thickness of the central region 21a of the first resin part 21. The axial length of the second resin part 22 is, for example, 6 mm to 12 mm.

[0029] The second resin part 22 is inserted into each of the through holes 21x. The second resin part 22 may be press-fitted into the through holes 21x or fixed with adhesive. For example, by providing a step on the inner wall of the through hole 21x that corresponds to the difference in diameter between the first cylindrical part 22a and the second cylindrical part 22b of the second resin part 22, the second resin part 22 can be easily positioned in the through hole 21x.

[0030] The second resin portion 22 is inserted into each through hole 21x and is in contact with the back surface 11h of the face portion 11 and the inner wall surface of the pocket portion 12 facing the back surface 11h. Here, "in contact" includes both direct contact and contact via adhesive. The face-side surface of the second resin portion 22, that is, the surface of the second cylindrical portion 22b opposite to the first cylindrical portion 22a, can be flush with, for example, the face-side surface of the first resin portion 21.

[0031] If a single resin is placed in the pocket area, a high-hardness resin would be required to avoid reducing the durability of the resin composite, making it difficult to obtain the pleasant sound and feel that should be achieved by using resin. On the other hand, if a single resin with low hardness is placed in the pocket area, the amount of deformation of the resin is large, resulting in greater deformation of the entire golf club head when the golf ball is struck, and thus reducing the durability of the resin composite.

[0032] However, in the golf club head 1, a resin composite 20 including a first resin part 21 and a second resin part 22 with different hardnesses is arranged inside the pocket part 12. Therefore, in the golf club head 1, the first resin part 21, which has lower hardness than the first resin part 21, can achieve a pleasant sound and feel when hitting the ball. Furthermore, the second resin part 22, which has higher hardness than the first resin part 21, suppresses deformation of the entire resin composite 20, thereby preventing a decrease in the durability of the resin composite.

[0033] In other words, by inserting the second resin part 22, which has a higher hardness than the first resin part 21, into the through hole 21x provided in the first resin part 21, and arranging it so as to be in contact with the back surface 11h of the face part 11 and the inner wall surface of the pocket part 12 facing the back surface 11h, good durability can be obtained. Furthermore, if one of the through holes coincides with the center of the face part 11 when viewed in the face-back direction, it is particularly effective in improving the durability of the resin composite.

[0034] Furthermore, the angle between the central axis of the second resin portion 22 and the back surface 11h of the face portion 11 is preferably 90 degrees ± 10 degrees, and more preferably 90 degrees ± 5 degrees. This makes it easier for the second resin portion 22 to suppress the deformation of the face portion 11 when a golf ball is struck, and is particularly effective in improving the durability of the resin composite.

[0035] Furthermore, in the golf club head 1, the resin composite 20 is positioned inside the pocket portion 12. This structure is expected to reduce the weight by 20g to 40g compared to a case where the same material as the head body portion 10 is filled into the pocket portion 12. This weight reduction allows for a larger golf club head 1. Additionally, the weight reduction allows for the optimal distribution of the excess weight.

[0036] Although preferred embodiments have been described in detail above, the invention is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims. [Explanation of Symbols]

[0037] 1 Golf club head 10 Head body 10x recess 11 Face section 11f Face 11h Back of the face 11s scoreline 12 Pocket section 13 Cavity section 14. Sole 15 Top section 16 Hosel section 20 Resin composite 21. First resin part 21a Central area 21x through holes 22 Second resin part 22a First cylindrical section 22b Second cylindrical section 30 Three-dimensional resin nameplates

Claims

1. The face and, The head body includes a pocket located on the sole side of the back of the face portion and opening towards the top, It has a resin composite disposed inside the pocket portion, The resin composite comprises a first resin portion and a second resin portion having a higher hardness than the first resin portion. The first resin part is provided with a through hole. The second resin portion is inserted into the through hole and is in contact with the back surface of the face portion and the inner wall surface of the pocket portion facing the back surface, in a golf club head.

2. The golf club head according to claim 1, wherein the second resin portion is elongated with the face-to-back direction as its longitudinal direction.

3. The hardness of the first resin part is A40 or more and A60 or less. The golf club head according to claim 1 or 2, wherein the hardness of the second resin part is A80 or more and A100 or less.

4. The golf club head according to claim 1 or 2, wherein the through hole coincides with the center of the face portion when viewed in the face-to-back direction.

5. The first resin part is provided with a plurality of through holes, The golf club head according to claim 1 or 2, wherein the second resin portion is inserted into each of the through holes and is in contact with the back surface of the face portion and the inner wall surface of the pocket portion facing the back surface.

6. The golf club head according to claim 5, wherein one of the multiple through holes coincides with the center of the face portion when viewed in the face-back direction.

7. The golf club head according to claim 1 or 2, wherein the shape of the first resin part is a square pyramid that can be placed inside the pocket part.

8. The head body portion includes a cavity portion located on the top side of the back of the face portion, The golf club head according to claim 1 or 2, wherein a three-dimensional resin nameplate is arranged inside the cavity portion.

9. The golf club head according to claim 8, wherein at least a portion of the three-dimensional resin nameplate is in contact with the resin composite.

10. The resin composite is fixed to the pocket portion with an adhesive. The golf club head according to claim 8, wherein the three-dimensional resin nameplate is fixed to the inside of the cavity portion with double-sided tape.

11. The specific gravity of the head body is 7 or more and 9 or less. The specific gravity of the resin composite is 0.5 or more and 1.5 or less. The golf club head according to claim 8, wherein the specific gravity of the three-dimensional resin nameplate is 0.8 or more and 1.8 or less.

12. The weight of the resin composite is 5 g or more and 7 g or less. The golf club head according to claim 11, wherein the weight of the three-dimensional resin nameplate is 2g or more and 6g or less.

Images