JP2022173897A - golf club set - Google Patents

Abstract

To provide a golf club set capable of reducing discomfort feeling at the time of address.SOLUTION: In a golf club set S, a first golf club 101 and a second golf club 102 having a loft angle β2 larger than that of the first golf club 101 each include a wood type golf club head 1 and a striking face 2a. When the golf clubs are placed in a reference condition on a horizontal plane, the striking faces 2a each have a face center FC, loft angles β1, β2 as an angle between a tangent line drawn in the face center, and a perpendicular line orthogonal to the horizontal plane, in a face perpendicular cross section passing the face center, and a face lower part roll 2r between the face center FC and a lower periphery E of the striking face 2a, in the face perpendicular cross section. A curvature radius R2 of the face lower part roll 2r of the second golf club 102 is smaller than a curvature radius R1 of the face lower part roll 2r of the first golf club 101.SELECTED DRAWING: Figure 8

Description

The present invention relates to golf club sets.

Patent Literature 1 listed below proposes a golf club set having a plurality of numbered golf clubs with different loft angles.

Japanese Patent No. 6465573

During golf play, a golfer sequentially selects a golf club with an optimum loft angle from a plurality of golf clubs according to the situation of each shot and hits the ball. Also, when addressing a golf club, a golfer gazes from above at the hitting face that directly hits the ball, but the appearance of the hitting face differs depending on the loft angle. That is, a golf club with a small loft angle makes the length of the hitting face in the longitudinal direction of the head appear small, while a golf club with a large loft angle makes the length of the hitting face in the longitudinal direction of the head appear large. Thus, if the appearance of the hitting face is different for each golf club, there is a problem that the golfer feels a sense of incongruity at address and finds it difficult to set up.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-described problems, and its main object is to provide a golf club set that is easy to hold by reducing discomfort at address.

The present invention is a golf club set, comprising a plurality of golf clubs including a first golf club and a second golf club having a loft angle larger than that of the first golf club, wherein the plurality of golf clubs Each of the clubs includes a wood-shaped golf club head, each of the golf club heads includes a hitting face for hitting a ball, the hitting face when the golf club head is placed on a horizontal surface in a reference state. is the face center, the loft angle, which is the angle between a tangent line drawn to the face center and a vertical line perpendicular to the horizontal plane in the face vertical section passing through the face center, and the face vertical section, a face lower roll in which a contour line between the face center and the lower peripheral edge of the hitting face forms an arcuate shape convex outward from the head, and the radius of curvature of the face lower roll of the second golf club is , wherein the radius of curvature of said lower face roll of said first golf club is smaller than said golf club set.

In another aspect of the present invention, in the vertical section of the face, each of the first golf club and the second golf club has a first distance that is a distance in the front-rear direction of the head from the center line of the shaft axis to the leading edge. and a difference between the first distance of the first golf club and the first distance of the second golf club may be 3.0 mm or less.

In another aspect of the present invention, in the vertical section of the face, each of the first golf club and the second golf club has a distance in the front-rear direction of the head from the shaft axis centerline to the upper peripheral edge of the hitting face. and the difference between the second distance of the first golf club and the second distance of the second golf club may be 5.0 mm or less.

In another aspect of the invention, the golf club head may be a fairway wood or hybrid.

In another aspect of the present invention, each of the golf club heads may have a thickness of 40 mm or less in the vertical direction of the head.

The golf club set of the present invention employs the above-described configuration, so that even golf clubs having different loft angles can reduce discomfort at address and are easy to hold.

1 is a perspective view showing an example of a golf club included in a golf club set of this embodiment; FIG. 1 is a front view of the golf club head of this embodiment; FIG. 1 is a plan view of a golf club head of this embodiment; FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3 showing a vertical cross-sectional view of the face; FIG. 2 is a front view of the golf club head for explaining the periphery of the hitting face; FIG. 7 is a cross-sectional view taken along line s1 of FIG. 6 for explaining the periphery of the hitting face; It is a face vertical cross-sectional view of the hitting face. FIG. 2 is a face vertical cross-sectional view of golf club heads of respective first and second golf clubs; 1 is a plan view of first and second golf clubs; FIG.

An embodiment of the present invention will be described below with reference to the drawings.
The golf club set of this embodiment includes a plurality of golf clubs. These golf clubs constitute, for example, a group of golf clubs marketed under a common brand name and/or concept. The sales form of the golf club set is not particularly limited. Therefore, a plurality of golf clubs do not necessarily have to be sold at the same time, and may be sold individually.

As shown in FIG. 9, the golf club set S of this embodiment includes at least a first golf club 101 and a second golf club 102 having a larger loft angle than the first golf club 101. .

1 to 3 respectively show a perspective view, a front view and a plan view of a first golf club 101 as an example for explaining the structure of the golf club. However, since the second golf club 102 also essentially has the same structure as the first golf club 101, detailed description thereof is omitted here.

As shown in FIGS. 1 to 3, the first golf club 101 includes a wood-type golf club head (hereinafter sometimes simply referred to as “head”) 1 and a shaft 10 .

[Reference state]
1-3, the first golf club 101 is placed in a reference state. In this specification, the “reference state” of the golf club is the state in which the head 1 is placed on the horizontal plane HP at the lie angle α (FIG. 2) and the loft angle set for the head 1 . As shown in FIG. 3, in the reference state, the head 1 is held at the lie angle α and the loft angle with the shaft axis center line CL of the shaft 10 arranged in the reference vertical plane VP perpendicular to the horizontal plane HP. be done. In this specification, unless otherwise specified, the head 1 is assumed to be in this reference state.

[Direction of head]
As shown in FIG. 3, in the reference state of the head 1, the direction x orthogonal to the reference vertical plane VP is the head front-rear direction. With respect to the longitudinal direction of the head, the side of the face 2 that hits the ball is defined as the front side, and the opposite side is defined as the rear side. A direction y parallel to both the reference vertical plane VP and the horizontal plane HP is defined as the toe-heel direction of the head 1 . Furthermore, a direction z orthogonal to the horizontal plane HP is defined as the vertical direction of the head 1 .

[Basic structure of the head]
FIG. 4 shows a partial cross-sectional view taken along line IV--IV of FIG. As shown in FIGS. 1 to 4, the head 1 includes a face 2, a crown 3, a sole 4, a hosel 5, a toe T and a heel H, and has, for example, a hollow portion i therein.

The head 1 of this embodiment is made of, for example, a metal material. The metal material is not particularly limited, but for example, pure titanium, titanium alloy, stainless steel, maraging steel, aluminum alloy, magnesium alloy, tungsten-nickel alloy and the like can be used. A part of the head 1 (for example the crown 3) may be made of non-metallic material such as fiber reinforced plastic.

The head 1 of this embodiment is configured as, for example, a fairway wood or a hybrid. These heads 1 preferably have, for example, a loft angle of 13 to 35 degrees, a head weight of 200 g or more, a head volume of 200 cc or less, and a head vertical thickness 2H (see FIG. 4) of 40 mm or less. . It should be noted that the head 1 in FIGS. 1 to 4 exemplifies a hybrid as a preferred embodiment.

[Face]
As shown in FIG. 4, the face 2 includes a hitting face 2a, which is a surface for hitting a ball, and a face inner surface 2i facing the hollow portion i.

[Crown]
A crown 3 extends rearward of the head from the face 2 so as to form the upper surface of the head. The crown 3 is, for example, the portion that is visible in the plan view of the head excluding the face 2 . A hosel 5 is provided on the heel side of the crown 3 . The hosel 5 is formed with a shaft insertion hole 5a for fixing a club shaft (not shown).

[Sole]
A sole 4 extends rearward from the face 2 to form a bottom surface of the head. The sole 4 is, for example, the part visible in the bottom view of the head.

[Periphery of hitting face]
The hitting face 2a is composed of, for example, a three-dimensional curved surface that is smoothly convex toward the outside of the head. The hitting face 2a is provided with a plurality of grooves called face lines extending in the toe-heel direction, but they are omitted from the drawings of this embodiment.

The striking face 2a is defined as the area surrounded by the perimeter E thereof. In this specification, the perimeter E of the striking face 2a is defined as follows. First, as shown in FIG. 5, cross sections s1, s2, s3, . The sweet spot SS is a point at which a normal line N drawn from the center of gravity CG of the head to the striking face 2a intersects the striking face 2a.

Next, as shown in FIG. 6, in each of the cross sections s1, s2, s3, . is obtained, and a line of these positions Pe is defined as the peripheral edge E of the hitting face 2a. Also, in this specification, the "radius of curvature" of any point on a curve means that point and the point on the curve that is 1 mm away on one side of that point and the point on the curve that is 1 mm away on the other side of that point. It is calculated as the radius of a single circle passing through the three points on the curve. These "1 mm" are the distance traveled along the curve.

[Face Center]
The hitting face 2a has a face center FC (see FIG. 2, etc.). As used herein, the face center FC is determined as follows. First, in the up-down direction and the toe-heel direction of the head 1, an arbitrary point P near the center of the hitting face 2a is selected.

Next, a plane passing through this point P and extending along the normal direction of the hitting face 2a at the point P and parallel to the toe-heel direction is determined. A line of intersection between this plane and the hitting face 2a is drawn to determine its midpoint Px.

Next, a plane that passes through the midpoint Px and extends along the normal direction of the hitting face 2a at the midpoint Px and that is parallel to the vertical direction is determined. A line of intersection between this plane and the hitting face 2a is drawn, and its midpoint Py is determined.

Next, a plane passing through the midpoint Py and extending along the normal direction of the hitting face 2a at the point Py and parallel to the toe-heel direction is determined. A line of intersection between this plane and the hitting face 2a is drawn, and its midpoint Px is newly determined.

Next, a plane that passes through the new midpoint Px and extends along the normal direction of the hitting face 2a at the point Px and that is parallel to the vertical direction is determined. A line of intersection between this plane and the hitting face 2a is drawn, and its midpoint Py is newly determined.

The above steps are repeated to sequentially determine Px and Py. In repeating this process, the new position Py (last position Py) when the distance between the new middle point Py and the immediately preceding middle point Py is 0.5 mm or less for the first time is The face center is FC.

The face center FC is the preferred hitting position at which the golfer attempts to hit the ball.

[Loft angle]
FIG. 7 shows the contour line of the hitting face 2a in the face vertical section passing through the face center FC. In this specification, the loft angle β of the hitting face 2a is measured at the face center FC. That is, as shown in FIG. 7, the loft angle .beta. is defined as the angle between

A plurality of golf clubs included in the golf club set S of this embodiment have different loft angles β obtained by the above-described measurement method. Therefore, the first golf club 101 with a relatively small loft angle β can achieve a hit ball with a longer flight distance and a lower trajectory. On the other hand, the second golf club 102, which has a relatively large loft angle β, can hit a ball with a shorter flight distance and a higher trajectory. As described above, the golf club set S of this embodiment can vary the flight distance and/or height of the hit ball depending on the shot situation.

[Lower face roll]
As shown in the face vertical cross-section of FIG. 7, the hitting face 2a has a face lower roll 2r. In the face lower roll 2r, the contour line of the hitting face 2a (hereinafter sometimes referred to as "lower hitting face") between the face center FC and the lower peripheral edge E of the hitting face 2a protrudes outward from the head. is an arc-shaped bulge.

The extent of swelling of the face lower roll 2r is defined by the radius of curvature R of the lower hitting face. In this specification, the radius of curvature R of the face lower roll 2r is defined by the face center FC, the lower (sole 4 side) peripheral edge E of the hitting face 2a, and the contour line of the lower hitting face in the vertical section of the face in FIG. measured as the radius of curvature of a single arc passing through three points at the midpoint CP of .

However, the face center FC, the peripheral edge E of the hitting face 2a, the loft angle β, and the curvature radius R of the face lower roll 2r are each a virtual hitting face that is smoothed by filling recesses such as the face line formed on the face 2. 2a.

FIG. 8 is a face vertical sectional view of each head 1 of the first golf club 101 and the second golf club 102 included in the golf club set S of this embodiment. Also, in FIG. 8, the shaft axis centerlines CL of the heads 1 of the first golf club 101 and the second golf club 102 are aligned with each other.

As shown in FIG. 8, the golf club set S includes a pair of a first golf club 101 with loft angle β1 and a second golf club 102 with loft angle β2 (>β1). The first golf club 101 and the second golf club 102 constitute a pair of consecutive numbers in the golf club set S. As shown in FIG. That is, in the golf club set S, the second golf club 102 has a loft angle β2 that is larger than the loft angle β1 of the first golf club 101 and closest to the loft angle β. In the above pair, the loft angle difference (β2-β1) is preferably in the range of 2 to 4 degrees, for example.

In the golf club set S of this embodiment, in the above pair, the curvature radius R2 of the face lower roll 2r of the second golf club 102 is smaller than the curvature radius R1 of the face lower roll 2r of the first golf club 101. It is

[Action of this embodiment]
In the second golf club 102, the length of the lower hitting face in the front-rear direction of the head is reduced. Therefore, the first golf club 101 and the second golf club 102 are close to each other in length in the front-to-rear direction of the hitting face 2a that the golfer pays particular attention to at address. Thus, in the golf club set S of this embodiment, even if the golf clubs are changed between the first golf club 101 and the second golf club 102 having different loft angles, there is little sense of incongruity, and the golf club can be addressed with the same feeling. You can get the advantage of being able to do it and make it easier to set up.

In order to further enhance the above effect, as shown in FIG. The difference |W1-W2| between the length W2 of the striking face 2a in the longitudinal direction of the head at the center FC is 7.0 mm or less, more preferably 5.0 mm or less, further preferably 3.0 mm or less, Most preferably, it is set to 0 mm. In other words, in a desirable mode, the curvature radius R2 of the face lower roll 2r of the second golf club 102 may be appropriately set so as to satisfy the difference |W1-W2|.

Moreover, the relationship (R2<R1) of the radius of curvature of the face lower roll 2r described above may be satisfied by the face vertical section passing through the face center FC. However, in a more preferable embodiment, the relationship (R2<R1) may be satisfied over a certain range X in the toe-heel direction around the face center FC, as shown in FIG. This range X can be, for example, 10 mm or more, more preferably 15 mm or more, and even more preferably 20 mm or more. As a result, the sense of incongruity at the time of address is further reduced.

Further, in the second golf club 102 of the present embodiment, since the radius of curvature R2 of the face lower roll 2r is formed small, the angle of inclination of the lower hitting face with respect to the vertical plane (for example, the midpoint CP in FIG. 7) (corresponding to the angle of the tangent drawn to the vertical plane) is smaller than that of the conventional structure. This inclination angle can be grasped as "the loft angle of the lower hitting face". In general, a golf club with a large loft angle has a relatively short flight distance when hit. However, since the second golf club 102 has a small loft angle of the lower hitting face, it is possible to extend the carry of the ball when hit with the lower hitting face. Therefore, the second golf club 102 of the present embodiment, which is configured as a hybrid golf club 102 in which there are many opportunities to hit a ball placed directly on the ground, is a new type of golf club that improves the flight distance of a hit ball while reducing discomfort at address. can solve problems.

As described above, in the golf club set S of this embodiment, in the first golf club 101 and the second golf club 102, the difference between the lengths W1 and W2 of the hitting face 2a in the front-rear direction of the head is less than Such a feature enables the first golf club 101 and the second golf club 102 to be designed so that the positions of the hitting face 2a relative to the hosel 5 in the front-rear direction of the head are the same or similar to each other. Such a design helps to further reduce discomfort at address.

For example, as shown in FIG. 8, the first golf club 101 and the second golf club 102 have first distances F1 and F2, which are the distances in the front-rear direction of the head from the shaft axis CL to the leading edge Le. Prepare for each. Here, the leading edge Le is specified as the frontmost position of the head 1 on the contour line of the face vertical cross section passing through the face center FC. In a preferred embodiment, the difference (absolute value) |F1-F2| It is preferably 1.0 mm or less, more preferably 0.5 mm or less, and most preferably 0 mm. The mode of FIG. 8 shows a mode in which F2<F1.

As described above, by limiting the difference between the first distances F1 and F2 to a certain range, the difference in the head shape when viewed from above is further reduced, thereby further reducing discomfort during address. can be done.

In the face vertical cross section shown in FIG. 8, the first golf club 101 and the second golf club 102 extend from the shaft axis centerline CL to the upper peripheral edge E of the hitting face 2a (the peripheral edge E on the crown 3 side). and second distances D1 and D2, which are distances in the front-rear direction of the head. In a preferred embodiment, the difference (absolute value) |D1-D2| It is preferably 3.0 mm or less, more preferably 1.0 mm or less, and most preferably 0 mm. In the embodiment of FIG. 8, in the first golf club 101, the upper peripheral edge E of the hitting face 2a is located forward of the shaft axis centerline CL. On the other hand, in the second golf club 102, the upper peripheral edge E of the hitting face 2a is located behind the shaft axis center line CL.

As described above, by restricting the difference between the second distances D1 and D2 to a small value, the difference in head shape when viewed from above is further reduced, and the uncomfortable feeling during addressing can be further reduced.

It should be noted that, in the above embodiment, two golf clubs are shown as the golf club set S. As shown in FIG. Alternatively, the golf club set may further include three or more golf clubs, including a third golf club (not shown) having a loft angle greater than that of the second golf club 102 . In this case, the radius of curvature of the lower face roll of the third golf club is preferably configured to be smaller than the radius of curvature R2 of the lower face roll 2r of the second golf club 102 .

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above specific disclosure, and various It can be changed and implemented.

More specific exemplary embodiments of the present invention are described below.
A golf club head having the basic structure shown in FIGS. 1 to 4 was prototyped based on the use shown in Table 1, and the sense of discomfort when addressing was evaluated by a questionnaire survey of 15 golfers. In the questionnaire survey, each golfer addressed with the first golf club and the second golf club, respectively, and evaluated ease of setting. Evaluation was made on a 5-point scale, with "5" being almost no discomfort and easy to address, and "1" being uncomfortable and difficult to address. The results of the tests are shown in Table 1.

As a result of the test, it was confirmed that the golf club set of the example is easier to hold than the comparative example.

S golf club set 1 golf club head 2 face 2a hitting face 2r face lower roll 101 first golf club 102 second golf club CL shaft axis center line E perimeter of hitting face FC face centers F1, F2 first distance D1, D2 Second distance Le Leading edge

Claims (5)

A set of golf clubs,
a plurality of golf clubs including a first golf club and a second golf club having a greater loft angle than the first golf club;
each of the plurality of golf clubs includes a wood-shaped golf club head;
each of the golf club heads includes a hitting face for hitting a ball;
When the golf club is placed on a horizontal plane in a reference state, the hitting face is:
face center and
the loft angle, which is the angle between a tangent line drawn to the center of the face and a vertical line perpendicular to the horizontal plane in the face vertical cross section passing through the center of the face;
a face lower roll having, in the vertical section of the face, a contour line between the center of the face and the lower peripheral edge of the hitting face forming an arcuate shape convex outward from the head;
the radius of curvature of the lower face roll of the second golf club is less than the radius of curvature of the lower face roll of the first golf club;
golf club set. In the vertical section of the face, each of the first golf club and the second golf club has a first distance, which is the distance in the front-rear direction of the head from the center line of the shaft axis to the leading edge,
2. The golf club set according to claim 1, wherein the difference between said first distance for said first golf club and said first distance for said second golf club is 3.0 mm or less. In the face vertical cross-section, each of the first golf club and the second golf club has a second distance, which is the distance in the front-rear direction of the head from the center line of the shaft axis to the upper peripheral edge of the hitting face,
3. The golf club set according to claim 1, wherein the difference between said second distance for said first golf club and said second distance for said second golf club is 5.0 mm or less. 4. The golf club set according to any one of claims 1-3, wherein the golf club head is a fairway wood or a hybrid. 5. The golf club set according to claim 1, wherein each of said golf club heads has a thickness of 40 mm or less in the vertical direction of the head.

Images