Gold club set

Abstract

SOLUTION: A golf club set is configured so that, in a first utility club 1a to a third utility club 1c, a first head 10a to a third head 10c have a first weight part 40a to a third weight part 40c, respectively. An intersection angle of a lower surface 42d of each of the first weight part 40a to the third weight part 40c to a horizontal line H passing through a grounding point P of each of a first sole surface 22a to a third sole surface 22c, becomes larger as a shaft number becomes higher. In addition, a position of center of gravity of each of the first head 10a to the third head 10c becomes higher as the shaft number becomes higher.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a golf club set including at least three utility clubs with different numbers. [Background technology]

[0002] A known head for a utility club is described in Patent Document 1. This head includes a main body and a weight portion that bulges out in a crescent shape from the back surface of the main body. A utility club equipped with such a head can increase the flight distance of a golf ball. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7060489 Summary of the Invention [Problem to be solved by the invention]

[0004] It is assumed that a golf club set includes multiple utility clubs. In this case, the multiple utility clubs have different numbers. If each of the multiple utility clubs has a weight portion, when a golf ball is hit with each of the multiple utility clubs, the height (highest point reached) of the trajectory of the golf ball tends to be significantly different from each other. For this reason, it is not easy for a player to predict the trajectory and flight distance of the hit golf ball.

[0005] The present invention aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] An aspect of the present invention is a golf club set including a first utility club having a first head, a second utility club having a second head having a larger club number than the first head, and a third utility club having a third head having a larger club number than the second head.

[0007] Each of the first head, the second head, and the third head has a hollow main body portion having a sole surface, a toe surface, a heel surface, a face surface, a back surface, and a crown surface, and a solid weight portion bulging from the back surface. When the direction of viewing the sole surface from the crown surface is defined as down, the direction of viewing the crown surface from the sole surface is defined as up, the direction of viewing the face surface from the back surface is defined as front, and the direction of viewing the back surface from the face surface is defined as rear, the weight portion bulges rearward from the back surface in a crescent shape when each of the first head, the second head, and the third head is viewed from above. The weight portion has a lower surface that is continuous with the sole surface and an upper surface that is continuous with the back surface. The sole surface and the lower surface of the weight portion are inclined relative to the sole surface so that the lower surface slopes upward as it extends rearward.

[0008] In the above configuration, the angle of intersection between the horizontal line passing through the contact point of the sole surface and the bottom surface increases as the club number increases, and the position of the center of gravity also increases as the club number increases. [Effects of the Invention]

[0009] When hitting a golf ball with each of the first to third utility clubs, there is no significant difference in the trajectory height (the highest point the ball reaches) despite the different club numbers, making it easy for players to predict the trajectory when hitting a golf ball with each of the first to third utility clubs. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is a plan view, partially in section, of a first head for a first utility club constituting a golf club set according to an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic side view of the first head as seen from the toe face side. [Figure 3] FIG. 3 is a side cross-sectional view of a cut surface that appears when the first head is cut along the front-rear direction and viewed from the heel surface. [Figure 4] FIG. 4 is a schematic explanatory diagram showing the trajectory and flight distance when a golf ball is hit with each of the first to third utility clubs. [Figure 5] FIG. 5 is a chart showing the numbers, loft angles and crossing angles of the golf club sets of the examples and the comparative examples. [Figure 6] FIG. 6 is a chart showing the results of hitting golf balls with the golf club set of the example and the golf club set of the comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, the components of the first head will be labeled "first." Similarly, the components of the second head will be labeled "second," and the components of the third head will be labeled "third."

[0012] The golf club set according to this embodiment includes a first utility club 1a shown in Figures 1 and 2. The first utility club 1a includes a first head 10a shown in Figures 1 and 2. The first head 10a includes a first main body portion 20a and a first weight portion 40a.

[0013] The first body portion 20a is a hollow body formed primarily from a metal material. The first body portion 20a has a first sole surface 22a, a first toe surface 24a, a first heel surface 26a, a first face surface 28a, a first back surface 30a, a first crown surface 32a, and a first neck portion 50a. A shaft 60 is attached to the first neck portion 50a.

[0014] Hereinafter, the direction in which the first sole surface 22a is viewed from the first crown surface 32a is referred to as "down," the direction in which the first crown surface 32a is viewed from the first sole surface 22a is referred to as "up," the direction in which the first face surface 28a is viewed from the first back surface 30a is referred to as "front," and the direction in which the first back surface 30a is viewed from the first face surface 28a is referred to as "rear." Therefore, for example, the first sole surface 22a forms the lower part of the first main body portion 20a, and the first crown surface 32a forms the upper part of the first main body portion 20a. The direction from the first face surface 28a toward the first back surface 30a is referred to as "rear," and the direction from the first back surface 30a toward the first face surface 28a is referred to as "front."

[0015] 2 represents a line that extends horizontally through the ground contact point P of the first sole surface 22a. In this case, the first neck portion 50a extends in a direction that is inclined relative to the horizontal line H. The intersection angle of the first neck portion 50a with the horizontal line H is the reference lie angle of the first head 10a.

[0016] 2, when the first neck portion 50a is oriented along the vertical line V, the first face surface 28a is inclined with respect to the vertical line V. The intersection angle β1 of the first face surface 28a with the vertical line V is the first loft angle of the first head 10a.

[0017] The first weight portion 40a bulges rearward from the first back surface 30a. As can be seen from FIG. 2, when the first head 10a is viewed from above, the first weight portion 40a is solid and crescent-shaped. The main body portion and the first weight portion 40a are integrally molded, for example, by precision casting. A suitable example of the material for the main body portion and the first weight portion 40a is stainless steel such as SUS630.

[0018] 2, the first weight portion 40a has a lower surface 42d and an upper surface 42u. The lower surface 42d is continuous with the first sole surface 22a. The upper surface 42u is continuous with the first back surface 30a.

[0019] FIG. 3 is a side cross-sectional view of the first head 10a when the ground contact point P on the first sole surface 22a is in contact with the ground at the reference lie angle. Note that FIG. 3 shows a cross section of the first head 10a cut along the front-to-rear direction, passing through the ground contact point P, and viewed from the first heel surface 26a toward the first toe surface 24a. As can be seen from FIGS. 2 and 3, the lower surface 42d of the first weight portion 40a is inclined relative to the first sole surface 22a, tilting upward as it extends rearward. That is, the inclination angle (first intersection angle) θ1 of the lower surface 42d with respect to the horizontal line H appears on this cross section. In other words, the lower surface 42d of the first weight portion 40a and the horizontal line H are inclined to form the first intersection angle θ1.

[0020] FIG. 3 shows the height position of the first center of gravity G1 of the first head 10a. In this embodiment, the height GH1 of the first center of gravity G1 is defined as the shortest distance from the ground contact point P (horizon H) to the first center of gravity G1. The actual first center of gravity G1 is located mainly between the first face surface 28a and the first back surface 30a (inside the hollow of the main body). That is, the position of the first center of gravity G1 shown in FIG. 3 is actually a position equivalent to the center of gravity, but to simplify the drawing and make it easier to understand, the first center of gravity G1 is shown on the first face surface 28a. The same applies to the second center of gravity G2 and the third center of gravity G3 described later.

[0021] As shown in FIG. 2, the second head 10b has a second loft angle β2 that is larger than the first loft angle β1 of the first head 10a. That is, the second face surface 28b of the second head 10b is more inclined than the first face surface 28a. Also, as shown in FIG. 3, the second intersection angle θ2 of the second head 10b is larger than the first intersection angle θ1 of the first head 10a. Furthermore, as shown in FIG. 3, the second center of gravity G2 of the second head 10b is higher than the first center of gravity G1 of the first head 10a. That is, the height GH2 of the second center of gravity G2 is larger than the height GH1 of the first center of gravity G1.

[0022] As shown in Fig. 2, the third head 10c has a third loft angle β3 that is larger than the second loft angle β2 of the second head 10b. That is, the third face surface 28c of the third head 10c is more inclined than the second face surface 28b. Since the larger the loft angle, the larger the yarn count, the head with the largest yarn count among the first head 10a to the third head 10c is the third head 10c. The head with the smallest yarn count among the first head 10a to the third head 10c is the first head 10a. The yarn count of the second head 10b is between the yarn count of the first head 10a and the yarn count of the third head 10c.

[0023] Also, as shown in Fig. 3, the third intersection angle θ3 in the third head 10c is larger than the second intersection angle θ2 in the second head 10b. Furthermore, as shown in Fig. 3, the third center of gravity G3 in the third head 10c is at a higher position than the second center of gravity G2 in the second head 10b. That is, the height GH3 of the third center of gravity G3 is larger than the height GH2 of the second center of gravity G2.

[0024] As described above, among the first head 10a to the third head 10c, the relationship θ1 < θ2 < θ3 holds, and the relationship GH1 < GH2 < GH3 holds. In other words, in the first head 10a to the third head 10c, as the yarn count increases, the intersection angle between the horizontal line H passing through each contact point P of the first sole surface 22a to the third sole surface 22c and each of the first weight portions 40a to the third weight portions 40c increases, and the center of gravity becomes higher. An example of the combination of the yarn counts of the first head 10a, the second head 10b, and the third head 10c is 3, 5, and 7.

[0025] The first intersection angle θ1 to the third intersection angle θ3 are preferably within the range of 3.0° to 26.0°. That is, the first intersection angle θ1 is preferably 3.0° or more. Thereby, in the first head 10a which is the smallest gauge among the first head 10a to the third head 10c, it is possible to avoid the first weight portion 40a from contacting the ground during hitting the ball. Further, the third intersection angle θ3 is preferably 26.0° or less. Thereby, in the third head 10c which is the largest gauge among the first head 10a to the third head 10c, it is possible to avoid the third center of gravity G3 from becoming excessively high. However, the first intersection angle θ1 to the third intersection angle θ3 only need to satisfy the relationship of θ1 < θ2 < θ3, and are not limited to 3.0° to 26.0°.

[0026] By attaching the shaft 60 to the first neck portion 50a of the first head 10a, the first utility club 1a is constituted. Similarly, by attaching the shaft 60 to the second neck portion 50b of the second head 10b, the second utility club 1b is constituted, and by attaching the shaft 60 to the third neck portion 50c of the third head 10c, the third utility club 1c is constituted.

[0027] As described above, between the first head 10a to the third head 10c, the relationship of θ1 < θ2 < θ3 holds, and the relationship of GH1 < GH2 < GH3 holds. Therefore, when a player hits a golf ball using each of the first utility club 1a, the second utility club 1b, and the third utility club 1c, as shown in FIG. 4, the heights of the trajectories (the highest points reached by the golf balls) become close to each other. That is, even when using utility clubs with different gauges, there is no significant difference in the height of the trajectory. On the other hand, when using utility clubs with different gauges, the flying distances of the golf balls are different from each other. For this reason, it is easy for the player to predict the trajectory and the landing point when hitting the golf ball with each of the first utility club 1a to the third utility club 1c. Therefore, for example, based on the distance from the hitting point to the green, it is easy for the player to determine which gauge of utility club should be selected.

[0028] Furthermore, the actual trajectory of a hit golf ball rarely deviates significantly from the predicted trajectory. Therefore, players can easily achieve a trajectory that matches the prediction, regardless of their golf skill level. Therefore, the headset according to this embodiment provides a golf club set that is easy for a variety of players to use.

[0029] The golf club set may include utility clubs other than the first utility club 1a to the third utility club 1c. For example, the set may include a utility club with a smaller number than the first utility club 1a, or a utility club with a larger number than the third utility club 1c. Furthermore, between the first utility club 1a and the second utility club 1b, a utility club with a larger number than the first utility club 1a and a smaller number than the second utility club 1b may be included, or between the second utility club 1b and the third utility club 1c, a utility club with a larger number than the second utility club 1b and a smaller number than the third utility club 1c may be included.

[0030] This embodiment has the following advantages.

[0031] The first head 10a, the second head 10b, and the third head 10c include a first main body portion 20a, a second main body portion 20b, and a third main body portion 20c, and a first weight portion 40a, a second weight portion 40b, and a third weight portion 40c, respectively. The first body portion 20a, the second body portion 20b, and the third body portion 20c have a first sole surface 22a, a second sole surface 22b, and a third sole surface 22c, a first toe surface 24a, a second toe surface 24b, and a third toe surface 24c, a first heel surface 26a, a second heel surface 26b, and a third heel surface 26c, a first face surface 28a, a second face surface 28b, and a third face surface 28c, a first back surface 30a, a second back surface 30b, and a third back surface 30c, and a first crown surface 32a, a second crown surface 32b, and a third crown surface 32c, respectively.

[0032] Each of the first weight portion 40a to the third weight portion 40c has a lower surface 42d continuous with each of the first sole surfaces 22a to the third sole surfaces 22c, and an upper surface 42u continuous with each of the first back surfaces 30a to the third back surfaces 30c. The lower surface 42d of each of the first weight portion 40a to the third weight portion 40c is relatively inclined upward so as to face upward as it goes backward with respect to each of the first sole surface 22a to the third sole surface 22c. For this reason, a horizontal line H passing through the contact point P of each of the first sole surface 22a to the third sole surface 22c and the lower surfaces 42d of each of the first weight portion 40a to the third weight portion 40c intersect at first intersection angles θ1 to third intersection angles θ3, respectively.

[0033] Among the first intersection angle θ1, the second intersection angle θ2, and the third intersection angle θ3, the relationship of θ1 < θ2 < θ3 holds. That is, as the count increases, the intersection angle increases. Also, among the height GH1 of the first center of gravity G1 of the first head 10a, the height GH2 of the second center of gravity G2 of the second head 10b, and the height GH3 of the third center of gravity G3 of the third head 10c, the relationship of GH1 < GH2 < GH3 holds. That is, as the count increases, the height GH of the center of gravity increases.

[0034] The first intersection angle θ1 to the third intersection angle θ3 can be obtained from the cross-sections of the first head 10a to the third head 10c, respectively. In this case, the first sole surface 22a of the first head 10a is grounded at the reference rake angle. In this state, the first head 10a is cut along the front-rear direction so as to pass through the contact point P. In the cross-section that appears at this time, the inclination angle of the lower surface 42d of the first weight portion 40a with respect to the horizontal line H passing through the contact point P of the first sole surface 22a can be taken as the first intersection angle θ1. Similarly for the second head 10b and the third head 10c, the second intersection angle θ2 and the third intersection angle θ3 can be obtained.

[0035] When the first utility club 1a to the third utility club 1c are manufactured using the first head 10a to the third head 10c, respectively, and a golf ball is hit with each of these first utility club 1a to the third utility club 1c, there is no significant difference in the trajectory height (the highest point of the hit golf ball) despite the different club numbers. In other words, the highest points of the hit golf ball are close to each other. This makes it easy for a player to predict the trajectory when hitting a golf ball with each of the first utility club 1a to the third utility club 1c.

[0036] Furthermore, players can easily achieve a predictable trajectory regardless of their golfing skill.

[0037] In one embodiment, the first intersection angle θ1 to the third intersection angle θ3 are each 26.0° or less.

[0038] This prevents the position (height GH3) of the third center of gravity G3 from being excessively high in the third head 10c, which has the largest club number among the first to third heads 10a to 10c.

[0039] In one embodiment, the first intersection angle θ1 to the third intersection angle θ3 are 3.0° or greater.

[0040] This prevents the first weight portion 40a from coming into contact with the ground when hitting the ball in the first head 10a, which has the smallest club number among the first to third heads 10a to 10c. [Example]

[0041] A shaft 60 was attached to each of the first neck portion 50a of the first head 10a, the second neck portion 50b of the second head 10b, and the third neck portion 50c of the third head 10c. As a result, a first utility club 1a (number 3), a second utility club 1b (number 5), and a third utility club 1c (number 7) were obtained, respectively. These are referred to as Examples. The loft angle β of each of the first head 10a to the third head 10c is shown in FIG. 5. The loft angle β corresponds to the first loft angle β1, the second loft angle β2, and the third loft angle β3 shown in FIG. 2. The second loft angle β2 is larger than the first loft angle β1, and the third loft angle β3 is larger than the second loft angle β2. In FIGS. 5 and 6, the term "golf club set" is abbreviated to "club set."

[0042] 5 also shows the intersection angles between a horizontal line H passing through the ground contact point P of each of the first to third heads 10a to 10c and the lower surfaces 42d of the first to third weight portions 40a to 40c. The intersection angles correspond to the first intersection angle θ1, the second intersection angle θ2, and the third intersection angle θ3 in FIG. 3. The second intersection angle θ2 is larger than the first intersection angle θ1, and the third intersection angle θ3 is larger than the second intersection angle θ2.

[0043] 5 also shows the height GH of the center of gravity of each of the first to third heads 10a to 10c. The height GH of the center of gravity corresponds to the first height GH1, the second height GH2, and the third height GH3 in FIG. 3. The second height GH2 is greater than the first height GH1, and the third height GH3 is greater than the second height GH2.

[0044] As comparative examples, a first utility club with a club number three, a second utility club with a club number five, and a third utility club with a club number seven were prepared. The loft angle β, crossing angle θ, and center of gravity height GH of each head of these utility clubs are also shown in FIG. 5. As can be seen from FIG. 5, the first loft angle β1, second loft angle β2, and third loft angle β3 are the same in the example and comparative example. However, in the comparative example, the crossing angle is the smallest in the second utility club.

[0045] The same player test-hit golf balls using the golf club set of the example and the golf club set of the comparative example. The swing speed, initial velocity of the golf ball, smash factor, launch angle, spin rate, maximum point of impact, carry, and flight distance (total of carry and run) of each utility club during the test hit were measured or calculated. The results are also shown in Figure 6.

[0046] In the third club, the Example golf ball was launched higher than the Comparative Example, resulting in a higher trajectory. Furthermore, due to the lower spin rate, the flight distance was greater than that of the Comparative Example. In the fifth club, the Example and Comparative Example had similar results. In the seventh club, the Example golf ball was launched lower than that of the Comparative Example, resulting in a lower trajectory. Furthermore, due to the higher spin rate, the ball is expected to stop more quickly after landing on the green.

[0047] Furthermore, in the golf club set of the embodiment, the highest point reached is approximately the same even if the club number is different, which makes it easier for the player to predict the trajectory.

[0048] The following additional notes are further disclosed regarding the above embodiment.

[0049] (Appendix 1) The golf club set disclosed herein includes a first utility club (1a) having a first head (10a), a second utility club (1b) having a second head (10b) having a larger club number than the first head, and a third utility club (1c) having a third head (10c) having a larger club number than the second head. Each of the first head, the second head, and the third head has a hollow main body portion (20a-20c) having a sole surface (22a-22c), a toe surface (24a-24c), a heel surface (26a-26c), a face surface (28a-28c), a back surface (30a-30c), and a crown surface (32a-32c), and a solid weight portion (40a-40c) protruding from the back surface.

[0050] When each of the first, second, and third heads is viewed from above, the weight portion bulges rearward in a crescent shape from the back surface. The weight portion has a lower surface (42d) that is continuous with the sole surface and an upper surface (42u) that is continuous with the back surface. The sole surface and the lower surface of the weight portion are inclined relative to the sole surface so that the lower surface slopes upward as it extends rearward.

[0051] In the above configuration, the intersection angle (θ1 to θ3) between the horizontal line (H) passing through the ground contact point (P) of the sole surface and the bottom surface increases as the club number increases, and the position (GH1 to GH3) of the center of gravity (G1 to G3) increases as the club number increases.

[0052] The intersection angle is determined as the inclination angle of the lower surface with respect to a horizontal line passing through the contact point that appears when each of the first head, the second head, and the third head is cut along the front-to-rear direction so as to pass through the contact point, with the sole surface of each of the first head, the second head, and the third head in contact with the ground at a reference lie angle.

[0053] When hitting a golf ball with each of the first to third utility clubs, there is no significant difference in the trajectory height (the highest point the golf ball reaches) despite the different club numbers, making it easy for players to predict the trajectory when hitting a golf ball with each of the first to third utility clubs.

[0054] (Appendix 2) In the golf club set described in Supplementary Note 1, the crossing angle in each of the first head, the second head, and the third head may be 26.0° or less.

[0055] In the third head, which has the largest club number among the first to third heads, the position of the center of gravity is prevented from being excessively high.

[0056] (Appendix 3) In the golf club set described in Supplementary Note 1 or 2, the crossing angle in each of the first head, the second head, and the third head may be 3.0° or greater.

[0057] In the first head, which has the smallest club number among the first to third heads, the first weight portion is prevented from coming into contact with the ground when hitting the ball.

[0058] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention. [Explanation of symbols]

[0059] 1a~1c...1st Utility Club~3rd Utility Club 10a~10c...1st head~3rd head 20a to 20c...First body portion to third body portion 22a~22c...1st sole surface~3rd sole surface 40a to 40c: First weight section to third weight section

Claims

1. A golf club set including a first utility club having a first head, a second utility club having a second head having a larger club number than the first head, and a third utility club having a third head having a larger club number than the second head, each of the first head, the second head, and the third head has a hollow body portion having a sole surface, a toe surface, a heel surface, a face surface, a back surface, and a crown surface, and a solid weight portion bulging out from the back surface; When a direction in which the sole surface is viewed from the crown surface is defined as a downward direction, a direction in which the crown surface is viewed from the sole surface is defined as an upward direction, a direction in which the face surface is viewed from the back surface is defined as a forward direction, and a direction in which the back surface is viewed from the face surface is defined as a rearward direction, the weight portion bulges rearward in a crescent shape from the back surface when each of the first head, the second head, and the third head is viewed from above, the weight portion has a lower surface connected to the sole surface and an upper surface connected to the back surface, the sole surface and the lower surface of the weight portion are inclined relative to each other such that the lower surface is inclined upward toward the rear with respect to the sole surface, The angle of intersection between the horizontal line passing through the contact point of the sole surface and the lower surface increases as the club number increases, and the position of the center of gravity increases as the club number increases.

2. 2. The golf club set according to claim 1, wherein the crossing angle in each of the first head, the second head, and the third head is 26.0° or less.

3. 3. The golf club set according to claim 1, wherein the crossing angle in each of the first head, the second head, and the third head is 3.0 degrees or greater.

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