Golf Club Set

Abstract

In the first utility club 1a to the third utility club 1c, the first head 10a to the third head 10c include a first weight portion 40a to a third weight portion 40c, respectively. The intersection angle between the horizontal line H passing through the ground contact point P of each of the first sole surface 22a to the third sole surface 22c and the lower surface 42d of the first weight portion 40a to the third weight portion 40c increases as the club number increases. In addition, the position of the center of gravity of each of the first head 10a to the third head 10c increases as the club number increases.

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 head described in Patent Document 1 is known as a head for a utility club. 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 including 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 a plurality of utility clubs. In this case, the plurality of utility clubs have different numbers. When each of the plurality of utility clubs includes a weight portion, when a golf ball is hit with each of the plurality of utility clubs, the height (maximum 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] One 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 number than the first head, and a third utility club having a third head having a larger number than the second head.

[0007] 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 from the back surface. When the direction in which the sole surface is viewed from the crown surface is defined as down, the direction in which the crown surface is viewed from the sole surface is defined as up, the direction in which the face surface is viewed from the back surface is defined as front, and the direction in which the back surface is viewed from the face surface is defined as rear, when each of the first head, the second head, and the third head is viewed in a plan view, the weight portion bulges backward from the back surface in a crescent shape. 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 faces upward as it approaches rearward.

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

[0009] When a golf ball is hit with each of the first to third utility clubs, there is no large difference in the trajectory height (the highest point the ball reaches) even though the club numbers are different. This makes it easy for a player to predict the trajectory when hitting a golf ball with each of the first to third utility clubs. [Brief description 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. [Diagram 2] FIG. 2 is a schematic side view of the first head as viewed from the toe face side. [Diagram 3] FIG. 3 is a side cross-sectional view of a cut surface appearing when the first head is cut along the front-rear direction as 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. [Diagram 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 embodiment and the golf club set of the comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 mainly made of 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". Thus, 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 with respect 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 in a plan view, the first weight portion 40a is solid and has a crescent shape. 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 cut in a state in which the ground contact point P on the first sole surface 22a is grounded at a reference lie angle. Note that FIG. 3 shows a cut surface of the first head 10a cut along the front-rear direction passing through the ground contact point P and seen from the first heel surface 26a toward the first toe surface 24a. As can be seen from FIG. 2 and FIG. 3, the lower surface 42d of the first weight portion 40a is inclined relatively to the first sole surface 22a so as to face upward toward the rear. That is, the inclination angle (first intersection angle) θ1 of the lower surface 42d with respect to the horizontal line H appears on this cut surface. In other words, the lower surface 42d of the first weight portion 40a and the horizontal line H are inclined so as to form the first intersection angle θ1.

[0020] FIG. 3 shows the height position of the first center of gravity G1 in 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 point P (horizon H) to the first center of gravity G1. The actual first center of gravity G1 is mainly located 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 in order 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 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 inclined more 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 count increases as the loft angle increases, among the first head 10a to the third head 10c, the head with the largest count is the third head 10c. Among the first head 10a to the third head 10c, the head with the smallest count is the first head 10a. The count of the second head 10b is between the count of the first head 10a and the 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. Further, 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 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 counts of the first head 10a, the second head 10b, and the third head 10c is 3 count, 5 count, and 7 count.

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

[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 height of the trajectory (the highest point reached by the golf ball) becomes 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] In addition, the actual trajectory of the hit golf ball does not deviate significantly from the predicted trajectory. Therefore, players can easily achieve a trajectory that matches the prediction, regardless of their golf skill. 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 golf club 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. In addition, 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 between the first utility club 1a and the second utility club 1b, or 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 between the second utility club 1b and the third utility club 1c.

[0030] This embodiment provides the following advantages.

[0031] The first head 10a, the second head 10b and the third head 10c include a first body portion 20a, a second body portion 20b and a third 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 each 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 surface 22a to the third sole surface 22c, and an upper surface 42u continuous with each of the first back surface 30a to the third back surface 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 go upward as it goes rearward 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 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 yarn 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 yarn count increases, the height GH of the center of gravity increases.

[0034] Note that 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 set 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 large difference in the trajectory height (the highest point of the hit golf ball) even though the numbers are different. In other words, the highest points of the hit golf ball are close to each other. For this reason, it is 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] Moreover, 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 head 10a to the third head 10c.

[0039] In one embodiment, the first intersection angle θ1 to the third intersection angle θ3 are each 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 head 10a to the third head 10c. EXAMPLES

[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 of No. 3, a second utility club 1b of No. 5, and a third utility club 1c of No. 7 were obtained, respectively. These are 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 addition, in FIG. 5 and FIG. 6, the "golf club set" is abbreviated to "club set".

[0042] Fig. 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] Fig. 5 also shows the height GH of the center of gravity of each of the first head 10a to the third head 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 number 3, a second utility club number 5, and a third utility club number 7 were prepared. The loft angle β, crossing angle θ, and height of the center of gravity GH of each head of these utility clubs are also shown in Figure 5. As can be seen from Figure 5, in the example and comparative examples, the first loft angle β1, the second loft angle β2, and the third loft angle β3 are each the same. 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 embodiment and the golf club set of the comparative example. The swing speed of each utility club, the initial speed of the golf ball, the smash factor, the launch angle, the spin rate, the highest point reached, the carry and the flight distance (the sum of the carry and the run) were measured or calculated. The results are also shown in FIG. 6.

[0046] In the third club, the Example was able to launch the golf ball higher than the Comparative Example, resulting in a higher trajectory. Also, because the spin rate was lower, the flight distance was greater than that of the Comparative Example. In the fifth club, the Example and Comparative Example had almost the same results. In the seventh club, the Example was able to launch the golf ball lower than the Comparative Example, resulting in a lower trajectory. Also, because the spin rate was higher, it is expected that the ball will stop quickly after falling on the green.

[0047] Furthermore, in the golf club set of the embodiment, the maximum reach is approximately the same even if the club numbers are different, which makes it easier for the player to predict the trajectory.

[0048] The following supplementary 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 number than the first head, and a third utility club (1c) having a third head (10c) having a larger 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 head, the second head, and the third head is viewed from above, the weight portion bulges backward from the back surface in a crescent shape. The weight portion has a lower surface (42d) connected to the sole surface and an upper surface (42u) connected to the back surface. The sole surface and the lower surface of the weight portion are inclined relatively to each other such that the lower surface faces upward as it faces backward with respect to the sole surface.

[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 ground 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 ground contact point with the sole surface of each of the first head, the second head and the third head being grounded at a reference lie angle.

[0053] When a golf ball is hit with each of the first to third utility clubs, there is no large difference in the trajectory height (the highest point the golf ball reaches) even though the club numbers are different. This makes it easy for a player 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 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 to 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 number than the first head, and a third utility club having a third head having a larger 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 protruding from the back surface, When a direction in which the sole surface is viewed from the crown surface is defined as a down direction, a direction in which the crown surface is viewed from the sole surface is defined as an up direction, a direction in which the face surface is viewed from the back surface is defined as a front direction, and a direction in which the back surface is viewed from the face surface is defined as a rear direction, when each of the first head, the second head, and the third head is viewed in a plane, the weight portion bulges rearward in a crescent shape from the back surface, 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 directed upward toward the rear with respect to the sole surface, In the golf club set, an intersection angle between a horizontal line passing through a ground contact point of the sole surface and the lower surface increases as the club number increases, and a position of a 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 equal to or less than 26.0 degrees.

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° or greater.

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