JP4274712B2 - Wood type golf club - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood type golf club.
[0002]
[Prior art]
Conventionally, it is said that a golf club having a smaller count (smaller loft angle) is more difficult to hit. That is, a club with a smaller loft angle, such as a driver club, is formed with a rising face, so that the hit ball does not rise high and the length of the club becomes long, so that the face is easily opened at the time of hitting and the ball is caught. Becomes worse and slice spheres are more likely to occur. In particular, when the head volume exceeds 300 cc, it is difficult to obtain a high trajectory flying ball, and the distance from the shaft axis to the center of gravity of the head increases, so that the face is difficult to return and slices are likely to occur.
[0003]
For this reason, many driver clubs with extreme hook faces have been distributed to correct the slice, but on the other hand, there are many complaints that it is difficult to set up. However, the hitting ball does not rise high, and actually, the hitting ball is rather low.
[0004]
Incidentally, a golf club (iron type) configured to easily obtain a high trajectory flying ball even with a club having a low count is disclosed in Japanese Patent Laid-Open No. 2000-93560. In this known technique, the face progression (FP; the distance between the shaft axis and the leading edge of the face) is set to be larger as the iron becomes longer, so that when the player is held, the ball is deviated in the hitting direction. Thus, the ball is hit when the swing trajectory is in the upper state (when a ball is hit in the upper state, a high trajectory flying ball is easily obtained).
[0005]
Therefore, it is considered that a high trajectory flying ball can be obtained by increasing the face progression of a wood type golf club, even with a low count club, particularly a driver club.
[0006]
[Problems to be solved by the invention]
However, increasing the face progression causes the face to shift forward accordingly, and the center of gravity of the head inevitably shifts forward.
[0007]
However, if the center of gravity shifts forward, the head becomes difficult to return at the time of hitting, and the face is likely to open. That is, based on the above-mentioned known technical idea, it is considered that a high trajectory flying ball can be obtained by increasing the face progression even in a club having a small loft angle such as a driver club. Since the head is difficult to return and the face is easily opened, a hit ball that is sliced with a high trajectory is likely to be generated.
[0008]
In particular, in a golf club with a so-called large head with a volume of 300 cc or more, the shaft length is long and the center of gravity is also away from the shaft axis as described above, so that a hit ball that is sliced more easily occurs. (Although it is possible to make it a hook face, there arises a problem that it is difficult to hold).
[0009]
As described above, among the conventional wood-type clubs, a golf club having a so-called large-sized head having a volume of 300 cc or more is difficult to obtain a high trajectory flying ball. Even if it is configured so that a flying ball can be obtained, slicing is likely to occur, and the ball cannot always be dropped to a desired position.
[0010]
This invention was made by finding that, when face progression is increased, a high trajectory flying ball can be obtained, but the center of gravity shifts forward, and the flight distance and directionality are not stable. An object of the present invention is to provide a golf club that has good directivity and can improve and stabilize a flight distance in a golf club having a head with a volume of 300 cc or more, among wood type clubs that are relatively difficult to hit. And
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, according to the present invention, in a wood type golf club having a head having a volume of 300 cc or more, the face progression is in the range of 21 mm to 24 mm and the center of gravity angle is in the range of 20 ° to 27 °. It is characterized by that.
[0012]
In the above configuration, the head volume is set to 300 cc or more. Conventionally, it has been said that a volume of about 260 cc is likely to cause slicing with a large-sized head. This is because it is becoming conscious that the size is large, and it is considered that slices are more likely to occur at 300 cc or more.
[0013]
In the above configuration, the face progression (FP) is the distance between the axis of the shaft and the leading edge (RE) of the face. The center-of-gravity angle is an angle formed by a perpendicular line extending from the center of gravity G of the head to the axis of the shaft and the face, and can be measured by a center-of-gravity angle measuring instrument (FG104RM) manufactured by Fourteen.
[0014]
As described above, in a head having a volume of 300 cc or more that is a large-sized head that is likely to be sliced, the head is designed to have a face progression of 21 mm or more and a center of gravity angle of 20 ° or more. The advantage that ballistic flying balls can be obtained and the advantage that slices are suppressed can be obtained in a well-balanced state.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the wood type golf club according to the present invention will be described.
As shown in FIG. 1, a wood type golf club 1 according to this embodiment includes a shaft 3 formed of steel, fiber reinforced resin, and the like, a grip 5 fitted into the base end of the shaft, and a tip of the shaft 3. The head 7 is configured to be fitted and fixed.
[0016]
In this case, the head 7 is configured as a metal hollow head having a volume of 300 cc or more, and includes a top 8a, a sole 8b, a toe 8c, a heel 8d, and a back 8e, as shown in FIGS. The head main body 8 and the face 10 attached to the head main body 8 are configured.
[0017]
In this embodiment, the top 8a, the sole 8b, the toe 8c, the heel 8d, and the back 8e (outer shell member) are formed by casting and forging titanium, a titanium alloy or the like, or by a pressed rolled material. The head body 8 is formed by integrating these separate outer shell members by welding or the like. Each outer shell member may be formed by integrating arbitrary members (for example, toe, heel, back). The face 10 is fixed to the front opening of the head main body 8 formed as described above by welding or the like (the welded portion is indicated by B).
[0018]
The top 8a is formed with a hosel 8f reaching the sole 8b on the heel side, and the shaft 3 shown in FIG. 1 is inserted into and fixed to the shaft fixing hole 8h. .
[0019]
In the hollow structure head described above, the distance L (face progression) between the axis X of the shaft 3 and the leading edge (RE) of the face 10 is set to 21 mm or more.
[0020]
Thus, by setting the face progression L to 21 mm or more, which is larger than that of the conventional general large-sized head, it becomes possible to perform addressing in a state where the ball position is shifted in the hitting direction. A high trajectory flying ball can be obtained easily by hitting a ball when the swing trajectory is in an upper state.
[0021]
In this case, if the face progression is too large, the position where the ball is placed at the time of addressing will change too much and it will be difficult to hold, and the head shape will be difficult to hold and will be difficult to hold. It is preferable to set to.
[0022]
In addition to increasing the face progression, the head is formed so that the center of gravity angle (the perpendicular formed by the head center of gravity G to the shaft axis X and the angle θ of the face 10) is 20 ° or more. Normally, when the face progression is increased, the position of the center of gravity shifts to the face side and the center of gravity angle θ is decreased, so that the head is difficult to return at the time of hitting. That is, even if it is configured so as to obtain a high trajectory flying ball as described above, a sliced sphere is likely to be generated, so that the gravity center angle is set to 20 ° or more so as to suppress it.
[0023]
In this case, when the head is formed in the range of the face progression L described above, if the center-of-gravity angle θ is too large, the entire head tends to be distorted, and addressing becomes difficult. 27 degrees or less is preferable.
[0024]
Further, in the head configured as described above, the distance L1 between the center of gravity G of the head and the sweet spot S (the depth of the center of gravity; the length of the perpendicular line extending from the center of gravity G to the face 10) is 300 cc. It is preferable that the head be configured to have an average value or more, specifically, 32 mm or more. As described above, by setting the depth of the center of gravity to 32 mm or more, the head easily returns in the vertical direction at the time of hitting, and it becomes easy to hit the upper track, and the hitting ball can be raised easily.
[0025]
In this case, if the depth of the center of gravity is too large, the rear portion of the sole tends to come into contact with the ground and tends to cause a miss shot. Therefore, it is preferable to set the depth of gravity to be 40 mm or less.
[0026]
Next, an embodiment will be described in which specific means for further increasing the gravity center angle and the gravity center depth are provided in the configuration of the head in which the face progression is 21 mm or more as described above.
[0027]
(1) Changing the thickness of the outer shell member constituting the head body As in the embodiment shown in FIGS. 3A and 3B, the thickness of the toe 8c among the outer shell members constituting the head body is changed. The thickness of the back 8e and the heel 8d is increased. Specifically, the thickness near the toe 8c is set to about 0.8 to 1.3 mm, and the thickness of the back 8e and the heel 8d is set to about 1.3 to 2.5 mm. By increasing the thickness of the back side in this way, the center of gravity G can be shifted in the A1 direction, and the center of gravity angle θ and the center of gravity depth can be increased. Further, by increasing the thickness on the heel side, the center of gravity G can be shifted in the A2 direction, and the center of gravity angle θ can be increased. In the present embodiment, the space between the back 8e and the heel 8d is thin. However, this portion may be made thick to increase the thickness from the back 8e to the heel 8d.
[0028]
Of the outer shell members, it is preferable to reduce the thickness of the top 8a and increase the thickness of the sole 8b. Specifically, the thickness of the top 8a is set to about 0.9 to 1.3 mm, and the thickness of the sole 8b is set to about 1.2 to 1.8 mm. Thus, by increasing the thickness of the sole, the center of gravity can be lowered, a stable hitting ball can be obtained, and the center of gravity depth can be increased.
[0029]
Further, if the thickness of the face 10 is reduced, the center of gravity G can be shifted in the A1 direction. Specifically, it is good to set it as 2.8 mm or less, Preferably it is the range of 1.6-2.8 mm. The center of gravity G can also be shifted in the A2 direction by increasing the thickness of the shaft fixing portion 8k in which the shaft fixing hole 8h is formed to 1.6 to 2.2 mm, and the center of gravity angle θ However, it is preferable to reduce the thickness to about 0.8 to 1.6 mm and to distribute the weight to the heel 8d or the like.
[0030]
(2) Attaching the weight As in the embodiment shown in FIGS. 4A and 4B, in the configuration in which the thickness of the toe 8c, the heel 8d, and the back 8e in the head main body 8 is substantially uniform, The weight member 15a is attached to the inner wall of the back 8e, and the weight member 15b is attached to the inner wall from the back 8e to the heel 8d. Each weight member can be composed of titanium or a titanium alloy piece, and is attached by welding to the above-described portion. Specifically, the thickness of the toe 8c, the heel 8d, and the back 8e is kept uniform at about 1.2 mm (0.9 to 1.5 mm), the weight member 15a is about 6 g, and the weight member 15b is about 5 g. Keep it as If the weight member is too heavy, the weight of the head increases, so that a weight member of about 3 to 10 g may be used.
[0031]
By attaching the weight member 15a to the back side in this way, the center of gravity G can be shifted in the A1 direction, and the center of gravity angle θ and the center of gravity depth can be increased. Further, by attaching the weight member 15b to the heel side, the center of gravity G can be shifted in the A2 direction, and the center of gravity angle θ can be increased.
[0032]
Further, in the configuration in which the thickness of the top 8a among the outer shell members is thinner than the thickness of the sole 8b, a similar weight member 15c is attached to the center of the sole 8b or the heel 8d side from the center. As a result, the center of gravity can be lowered, a stable hitting ball can be obtained, and the depth of the center of gravity can be increased. Specifically, the thickness of the top 8a is about 1.0 mm (0.8 to 1.4 mm), the thickness of the sole 8b is about 1.3 mm (1.0 to 1.7 mm), and the weight member 15c may be about 4 g (3 to 10 g).
[0033]
Further, in the above-described configuration, regarding the thickness of the face 10, the vicinity of the sweet spot is thick and the periphery thereof is thin, and the center of gravity G is shifted in the A1 direction. It is trying to improve. Specifically, the thickness in the vicinity of the sweet spot is set to about 2.4 mm (2.0 to 2.8 mm), and the surrounding thickness is set to about 2.0 mm (1.8 to 2.3 mm).
[0034]
(3) Devise the head shape For example, as shown in FIG. 2, the center of gravity G is shifted in the A2 direction shown in FIG. And the center-of-gravity angle θ can be increased. Specifically, when the head 7 is viewed from the front, the head 10 is positioned so that the center P2 of the toe heel length of the face 10 is more than 3 mm toward the heel side than the center P1 of the toe heel length. It is preferable to form.
[0035]
The means (1) to (3) described above are merely examples, and the above means may be arbitrarily combined, or the shape of the head, the thickness of each part, and its constituent materials may be changed. Thus, the centroid angle θ and the centroid depth can be increased.
[0036]
By the way, it is possible to easily increase the center of gravity angle by designing the head so that the center of gravity is on the heel side in the relationship between the center of gravity depth and the center of gravity angle. However, assuming the same barycentric angle, if the barycentric position is shifted to the heel side, the barycentric depth is reduced accordingly, and as a result, the trajectory at the time of hitting the ball is lowered. In other words, the means of simply increasing the center of gravity angle with the center of gravity position at the heel side reduces the effect of increasing the trajectory even if the head returns better, so the center of gravity depth has a volume of 300 cc or more. It is preferable to set the average value of the head (32 mm) or more.
[0037]
Next, a test hit test performed on the relationship between the face progression and the gravity center angle will be described.
[0038]
The trial hit test was conducted on a driver club with a shaft length of 45 inches, a total club weight of 295 g, a swing balance of D1, a loft angle of 10.5 °, and a head volume of 315 cc, with a face progression of 18 mm, 21 mm, and 24 mm. When a total of 12 trial hit clubs were set at 17 °, 20 °, 23 °, and 27 °, and 10 average golfers with handicap of 18 to 27 hit 10 balls for each club. This was performed by measuring the vertical launch angle, the amount of blurring in the left-right direction with respect to the target direction (yard; marked with a slice, plus a hook, minus), and flight distance (yard).
[0039]
The table in FIG. 5 is a chart showing the average value of the above-described test hit results, and the distribution diagram in FIG. 6 is a graph showing the center of gravity angle and face progression as well as a number of driver clubs that are generally available on the market. The test club is marked. As is clear from this distribution chart, in the conventional head design, there is a certain degree of correlation between the face progression and the center of gravity angle.If the face progression is increased, the center of gravity angle decreases, and conversely, the center of gravity angle decreases. When it is increased, the face progression is reduced.
[0040]
In the trial hit test, when the launch angle in the appropriate range with respect to the loft angle of 10.5 ° is 12 to 14 °, the left and right blurs are the hook system, and the flight distance is 200 yards or more, the test results in FIG. According to the results, the trial clubs having face progressions of 21 mm and 24 mm and center-of-gravity angles set to 20 °, 23 °, and 27 ° gave good results.
[0041]
As described above, when the face progression exceeds 24 mm, the tendency to be difficult to hold at the time of addressing increases, and when the center of gravity angle exceeds 27 °, the hook tendency increases and the above-described tendency is increased. Thus, since the head shape is also distorted and difficult to hold, it is preferable to set the head to 24 mm or less and 27 ° or less, respectively.
[0042]
As described above, according to the present invention, in a golf club equipped with a large head (a head of 300 cc or more) that is generally difficult to hit, the face progression and center-of-gravity angle of the head are changed to a conventional general head configuration. On the other hand, both are designed to be large (each 21 mm or more, 20 ° or more), and as described above, the directionality is stable and the flight distance is improved, and the ball is dropped to the target position. This can be facilitated.
[0043]
【The invention's effect】
As described above, according to the wood type golf club of the present invention, the directionality is stable, and the flight distance can be improved and stabilized.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of a wood type golf club according to the present invention.
FIG. 2 is a front view of a head portion of the wood type golf club shown in FIG.
FIGS. 3A and 3B are diagrams showing an embodiment for realizing a head of a wood type golf club according to the present invention, wherein FIG. 3A is a plan sectional view of the head, and FIG. 3B is a longitudinal sectional view of a sweet spot portion.
4A and 4B are views showing another embodiment for realizing a head of a wood type golf club according to the present invention, wherein FIG. 4A is a plan sectional view of the head, and FIG. 4B is a longitudinal sectional view of a sweet spot portion. .
FIG. 5 is a table showing the results of a trial hit test conducted on the relationship between face progression and barycentric angle.
FIG. 6 is a distribution diagram showing a number of generally available driver clubs and test hit clubs used for the test hit test with respect to the center of gravity angle and face progression.
[Explanation of symbols]
1 Wood type golf club 3 Shaft 7 Head 8 Head body 10 Face L Face progression θ Center of gravity angle

Claims (2)

A wood type golf club having a head with a volume of 300 cc or more, wherein the face progression is in the range of 21 mm to 24 mm and the center of gravity angle is in the range of 20 ° to 27 ° . 2. The wood type golf club according to claim 1, wherein the center of gravity depth is in a range of 32 mm to 40 mm .

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