JP3113222B2 - Golf club iron set - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club iron set, and more particularly, to a golf club iron set capable of hitting a ball relatively straight toward a target position using any club from a low count side to a high count side. To make it possible.

[0002]

2. Description of the Related Art In general, in an iron club set of a golf club, a golfer who applies a certain amount of force to a low-numbered club is difficult to swing out because the shaft is long and the loft is small (the loft angle is small). If you do not swing through the club, the ball will not spin and the ball will not fly high. Therefore, many golfers are worried that they cannot achieve the expected flight distance when hitting a ball with a low-counter club, and such golfers try to fly the ball far away and need more upper body than necessary when swinging. The right-handed golfer will fly to the right of the target, and the left-handed golfer will fly to the left of the target, because the body will open quickly and the wrist will be delayed as a result. Mistakes often occur.

[0003] On the other hand, the club on the high count side has a short shaft, and the wrist tends to return because the hand passes close to the body during the swing. Therefore, the right-handed golfer will fly to the left of the target location, and the left-handed golfer will fly to the right of the target location, so-called catching balls will increase. This tendency is not uncommon for intermediate and advanced golfers.

[0004]

The above-described miss shots are caused by the fact that the length of the shaft of each iron club constituting the iron club set differs depending on the iron count, and the face direction of the club head at the time of hitting the ball is This occurs because the face direction at the address is not faithfully reproduced. However, it is not easy for a golfer to increase the swing speed when hitting a ball with a low-counter club without putting excessive force on the upper body. Further, it is not easy to consciously correct the swing trajectory according to each of the case where the ball is hit with the low count club and the case where the ball is hit with the high count club. Therefore, many golfers are currently suffering from the above-mentioned missed shots.

[0005] The present invention has been made in view of the above-described circumstances, and it is intended to hit a ball relatively straight toward a destination in any of the clubs from the low count side to the high count side. It is an object to provide an iron club set that can be used.

[0006]

In order to solve the above-mentioned problems, the present invention has been achieved based on the following findings previously made clear by the present applicant. That is, the present applicant has previously determined that in a pipe or solid shaft formed at least in part using an anisotropic material such as a fiber-reinforced resin, the fiber angle of the anisotropic material is partially changed in the circumferential direction. In addition, it has been clarified that if at least a portion in the thickness direction is different, the elastic main axis of the pipe or the shaft can be set at an arbitrary position different from the geometrical main axis (Japanese Patent Laid-Open No. Hei. 227616).

For example, in a pipe-shaped structure 10 made of a fiber-reinforced resin shown in FIGS. 9 to 12, cylindrical coordinates [(r, θ, Z) system coordinates] are set so as to coincide with the geometric main axis G. Then, irrespective of Z and r, 0 ° ≦ θ <18
In the portion 10a at 0 °, the angle (fiber angle) of the fiber F with respect to the geometric main axis G (that is, the Z axis) is set to α ₁ = 30 °, while at the portion 10b of 180 ° ≦ θ <360 °, the fiber angle is set. Is set to β ₁ = −30 °, and its elastic principal axis E does not coincide with the geometric principal axis G, and passes through a point Q away from the geometric principal axis G. As shown in FIG. 13, one end of the pipe-shaped structure 10 is a fixed end 10c and the other end is a free end 10d.
When the load Q is fixed at a position deviating from the vertical direction of the elastic main shaft E and a load is applied downward to a position that does not pass through a point on the elastic main shaft E in this state, the pipe-shaped structure 10 As shown in FIG. 14 and FIG.

On the other hand, when a load is applied downward through the point Q on the elastic main axis E, as shown in FIGS. 16 and 17, deflection occurs, but no twist occurs.

The present invention solves the above-mentioned problems by applying a unique deformation behavior obtained by forming the above-described anisotropic material to a golf club shaft.

That is, the present invention is a golf club eye set including a plurality of iron clubs having different numbers according to claim 1, wherein at least one iron club has at least a part of a club shaft formed of a fiber-reinforced resin, It is formed of a material having anisotropy by combining one or more of fiber reinforced rubber and rubber having orientation, and the fiber angle and / or orientation angle of the material having anisotropy is determined by the circumference of the shaft. The club head may be partially different in the direction and at least partly in the thickness direction, and
Is in contact with the horizontal plane, and the lie angle and loft angle of the golf club
When placed so as to be parallel to the intersection line between the face surface of the iron head and the horizontal plane and a specific plane including the geometric main axis of the shaft, when 200 mm is fixed from the grip side end of the shaft. An object of the present invention is to provide a golf club iron set comprising a club in which a plane including an elastic main axis and the geometric main axis intersect at an intersection angle of 45 to 90 °.

The club head has a bottom surface in contact with a horizontal surface.
And the lie angle and loft angle of the golf club
As shown in FIGS. 18 and 19, when the club head 14 is placed , the bottom surface 14b of the club head 14 is in contact with the ground (horizontal surface H), and the golf club has a predetermined lie angle γ and a loft angle δ.
It is the state where it is placed so that it becomes.

The fiber-reinforced resin may be glass fiber, carbon fiber, various organic fibers, alumina fiber, silicon carbide fiber, metal fiber and / or a mixture thereof, as a reinforcing fiber material, a woven fabric or a mat. And resins such as polyamide, epoxy and polyester are preferably used as the resin.

Further, the entire club shaft may be formed of the above-mentioned fiber-reinforced resin, or in addition to the fiber-reinforced resin, an anisotropic material such as fiber-reinforced rubber or rubber having orientation and / or fibers. Resins and rubbers that are not contained may be used in combination.

The configuration of the shaft made of the above-mentioned material may be the same in the entire length in the axial direction, or may be changed in the axial direction.

[0015] The golf club iron set of the present invention comprises:
More specifically, (i) the lowest iron club among a plurality of iron clubs constituting the set, or a few iron clubs starting from the lowest iron club and having a few lower iron clubs, the specific plane described above. The intersection angle between the elastic main axis and the plane including the geometric main axis is 45 to 90 °, and the space around the club head is divided into a face side space and a back face side space of the club head with a specific plane as a boundary. When divided, the elastic main shaft is arranged in the back face side space, or (ii) from the highest iron club among the plurality of iron clubs constituting the set, or from the highest iron club For the first few iron clubs on the high count side, the intersection angle between the specific plane and the plane including the elastic main axis and the geometric main axis is 45 to 90 °. With Unisuru, when divided into the face-side space and a back face side space of the club head space around the club head a specific plane boundary, so that the elastic main axis placed in the face-side space, or,
Both (i) and (ii) are performed (claim 2).

More specifically, several low-count iron clubs starting from the lowest iron club are at least two or more clubs selected from iron clubs having a loft angle of 26 ° or less. Starting from the highest iron club, the few higher iron clubs are at least two or more clubs selected from iron clubs having a loft angle of 36 ° or more (claim 3).

When the golf club iron set of the present invention having the above-described structure is used, the elastic main axis and the geometric main axis of the shafts of the low-count iron club and the high-count iron club are shifted at a predetermined intersection angle. The shaft is flexed and twisted by the toe-down of the club head due to the centrifugal force acting on the swing. For this reason, in the low-counter club head in which the elastic main shaft is arranged in the back face side space, even if the golfer swings just before opening, the toe side of the club head will enter the hitting position later than the heel side of the club head. The trajectory of the golf club is corrected so that the orientation of the face surface is true to the ball. In the club head on the high count side where the elastic main shaft in the face side space is arranged,
Even if the golfer swings too quickly,
The trajectory of the swing golf club, in which the heel side of the club head attempts to enter the hitting position later than the toe side of the club head, is corrected so that the face surface is oriented with respect to the ball. Therefore, the golfer does not need to consciously correct the change in the club trajectory that is likely to occur due to the difference in the club shaft length when swinging the low count iron club and when swinging the high count iron club. By simply striking the club down against the ball, the club can be swung so that the face surface is oriented with respect to the ball, and the ball can be hit straight toward the target relatively easily.

As described above, among the plurality of iron clubs constituting the set, the iron club on the high count side is not limited to the one in which the shaft is bent and twisted at the time of swing, and the iron club on the low count side is used. For clubs only, the shaft bends during the swing and twisting occurs.On the contrary, the iron clubs on the low count side do not have to be twisted with the shaft flexing during the swing, but on the high count side. The only reason why the shaft bends and twists when swinging is the iron club is that the golfer swings hard to cause a miss shot with the iron club on the low count side, or the high count side There are also those that make swings that miss shots at the iron club of It is to correspond to the golfer such as.

Further, in the above description, the iron club on the low count side which causes the shaft to bend and twist at the time of the swing is intended for the iron club having a loft angle of 26 ° or less, and the loft angle is set for the iron club on the high count side. It is intended for iron clubs of 36 ° or more. Generally, in low-rank clubs having a loft angle of 26 ° or less (low-count clubs of 5 iron or less), only the body opens quickly. A swing in which the return of the wrist is delayed easily occurs, and in a high-count club having a loft angle of 36 ° or more (a high-count club having an 8-iron or more), the swing in which the wrist returns quickly is likely to occur. It is because it becomes.

In the above, the intersection angle between the specific plane and the plane including the elastic principal axis and the geometric principal axis is 45 to 90.
Starting from the iron club with the lowest number of degrees, several iron clubs on the lower number side, the smaller the club in the loft angle, the larger the intersection angle between the specific plane and the plane including the elastic main axis and the geometric main axis The intersection angle between the specific plane and the plane including the elastic main axis and the geometric main axis is set to 45 to 9
Starting from the highest iron club with 0 °, several higher iron clubs, the larger the loft angle of the club, the greater the intersection angle between the specific plane and the plane including the elastic main axis and the geometric main axis. It is preferable that the above conditions be satisfied (claim 4). This is because, as the lower numbered club among the several lower numbered clubs, the toe side of the club head is more likely to be delayed than the heel side, the lower the numbered club, the more flexure and twist of the shaft. The trajectory correction of the club due to the large number of the clubs on the higher count side of the above-mentioned several high count side clubs, the heel side of the club head is more likely to lag behind the toe side, so the lower count side This is because the amount of correction of the trajectory of the club due to the bending and twisting of the shaft increases as the club becomes larger.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A plurality of prepreg sheets made of a carbon fiber reinforced epoxy resin having different orientation directions of reinforcing fibers are prepared, and these are wrapped around a mandrel in a laminated configuration shown in Table 1 to obtain four types of golf club shafts. 4 was created.

[0022]

[Table 1]

The shaft 1 has a portion where 0 ° ≦ θ <180 ° around the axis of the shaft and 180 ° ≦ θ <3.
The prepreg sheet wound around the 60 ° portion had the same configuration.

The shaft 2 has the same configuration of the inner layer and the intermediate layer as a prepreg sheet wound around a portion of 0 ° ≦ θ <180 ° and a portion of 180 ° ≦ θ <360 ° around the axis of the shaft. The outer layer was wound with a prepreg sheet in which the reinforcing fibers were oriented in directions opposite to each other with respect to the axis of the shaft. That is, the outer layer is 0 ° ≦
Four layers of prepreg sheets in which the orientation direction of the reinforcing fibers is + 35 ° are wound around the portion where θ <180 °, and 180 ° ≦ θ <36.
Four layers of -35 ° prepreg sheets were wound around the 0 ° portion.

The shaft 3 has a portion of 0 ° ≦ θ <180 ° in the circumferential direction around the axis of the shaft with respect to the intermediate layer,
The prepreg sheet wound around a portion where 180 ° ≦ θ <360 ° had the same configuration, and the inner layer and the outer layer were wound with prepreg sheets in which reinforcing fibers were oriented in directions opposite to each other with respect to the axis of the shaft. That is, the orientation direction of the reinforcing fiber is +2 at the portion of 0 ° ≦ θ <180 ° between the inner layer and the outer layer.
A 5 ° prepreg sheet was wound one layer at a time, and a −25 ° prepreg sheet was wound one layer at a time at 180 ° ≦ θ <360 ° between the inner layer and the outer layer.

Similarly to the shaft 3, the shaft 4 has an intermediate layer in the circumferential direction around the axis of the shaft.
A prepreg sheet wound around a 180 ° portion and a 180 ° ≦ θ <360 ° portion has the same configuration, and a prepreg sheet in which reinforcing fibers in the inner layer and the outer layer are inclined in directions opposite to each other with respect to the axis of the shaft. Was wound. That is, a prepreg sheet in which the orientation direction of the reinforcing fiber is + 50 ° is wound one layer at a time between 0 ° ≦ θ <180 ° of the inner layer and the outer layer, and −50 ° is wound around the 180 ° ≦ θ <360 ° of the inner layer and the outer layer. Was wrapped one layer at a time.
The total length of the shafts 1 to 4 was 920 mm.

Next, the deformation behavior of each shaft when a load was applied from a predetermined direction to a position 20 mm from the end on the small diameter side was examined. The test was performed by the method shown in FIG. That is, the chucking device 200 holds the shaft S in the horizontal direction by gripping the length of 200 mm from the large-diameter end 100a of the shaft S, while holding the shaft S in the horizontal direction at a position 20 mm from the small-diameter end 100b of the shaft S. The middle part of a wire 50 having a length of 140 mm was placed on the top portion so as to be orthogonal and horizontal to the axis of the shaft S. In this state, a 1.1 kg weight 51 was hung on the lower end of the shaft S at a position 20 mm from the small-diameter end 100b, and the amount of deflection and twist of the shaft S was measured. As shown in FIGS. 2 (A), 2 (B), and 2 (C), the direction of the load is changed by changing the gripping direction of the shaft S and changing the load direction with respect to a straight line connecting the 0 ° position and the 180 ° position in the circumferential direction of the shaft. The angles were changed so as to be 90 °, 60 °, and 45 °. The amount of deflection is measured by measuring a descending amount 1 of the end 100b on the small diameter side of the shaft after the load is applied from the state before the load is applied (FIG. 1).
(A)), the torsion amount was measured by measuring the rotation angle γ about the joint of the wire 50 and the shaft after the load was applied from the state before the load was applied (FIG. 1B). Table 2 shows the results.

[0028]

[Table 2]

According to Table 2, when a load is applied to the position of 20 mm at the tip of the shaft from the lateral direction of the shaft, the shaft 1
It can be seen that it bends but no twist occurs. on the other hand,
It can be seen that the shafts 2 to 4 are bent and twisted.

Next, golf club iron sets of Embodiments 1 to 5 and Comparative Examples were produced using the shafts 1 to 4. Table 3 shows the shafts used and the mounting orientation of the iron club head for each iron number of the golf club iron set of the embodiment and the comparative example.

[0031]

[Table 3]

The mounting direction of the club head is indicated by the intersection angle between the elastic main axis of the shaft and the above-mentioned specific plane when using the shafts 2 to 4 which cause torsion together with bending. When the space around the club head is divided into the face side space and the back face side space of the club head with the above-mentioned specific plane as a boundary in the low count club, the elastic main shaft is arranged in the back face side space. On the other hand, in the high-counter club, when the space around the club head is divided into the face-side space and the back-face-side space of the club head with the above-mentioned specific plane as a boundary, the elastic main shaft is arranged in the face-side space. On the other hand, in the shaft 1 in which deflection occurs but twisting does not occur, the elastic principal axis of the shaft coincides with the geometric principal axis. Therefore, even if the club head is mounted at any position in the circumferential direction of the shaft, the elastic principal axis of the shaft and the aforementioned specific plane Is 0 °. Therefore, it is 0 ° at any count. As shown in Table 4, in each of the club sets, the shaft used is adjusted by cutting the required length of the shaft for each count to adjust the shaft length, and the total length (club length) of the club including the shaft and the club head is determined by each count. Each time was set to the standard value.

[0033]

[Table 4]

For each of the golf club iron sets of the embodiment and the comparative example manufactured in this way, a total of ten testers of intermediate and intermediate level performed a hit ball test. Here, the testers were all right-handed, including four people who were not good at long irons, and four people who were short irons and often hit balls. Each club counts 5 balls per club,
The amount of displacement (the amount of displacement in the left-right direction) of the drop point of the ball of 10 × 5 balls from the target position was measured, and the average value thereof was calculated.

3 to 8 show these results. FIG. 3 shows the results of the comparative example, and FIGS. 4 to 8 show the results of the first to fifth embodiments. In each of the figures, the horizontal axis indicates the club number, and the vertical axis indicates the amount of deviation of the ball drop point from the target value. Note that the + value on the vertical axis is a right shift, and the − value is a left shift.

From the comparison between FIG. 3 and FIG. 4, compared with the case where the ball is hit with the iron set of the comparative example using the shaft 1 which does not cause the twist in all the clubs of the count, the twist shaft 2 is attached to the shaft of the second iron. In the iron set of the first embodiment in which the elastic main axis of the shaft intersects the specific plane described above, the falling point of the ball when hit with a second iron approaches the target value, and the amount of displacement to the right decreases. You can see that there is. On the other hand, in the iron set of the second embodiment in which the torsion shaft 2 is used for the AW (approach wedge) in FIG. 5 to intersect the elastic main axis of the shaft with the specific plane, the falling point of the ball when hit with the AW is It can be seen that the amount of deviation to the left approaches the target value and decreases.

Further, the torsion shaft 3 is used for the second iron and the third iron in FIG. 6 to intersect the elastic main axis of the shaft with the above-mentioned specific plane, and the torsion shaft 4 is used for PW (pitting wedge) and AW. In the iron set according to the third embodiment in which the elastic main axis of the shaft intersects the specific plane described above, the ball when hit with the second iron, the third iron, PW, and AW is compared with the case where the ball is hit with the iron set of the comparative example. It can be seen that the falling point of is approaching the target value.

Further, the above-mentioned torsion shaft 3 is used for the second iron, the third iron and the fourth iron in FIG.
In the iron set according to the fourth embodiment, in which the elastic main axis of the shaft intersects the specific plane using the torsion shaft 4 for the W, ninth iron, the fourth iron is compared with the case where the ball is hit with the iron set of the third embodiment. It can be seen that the drop point of the ball when hit with a ninth iron is approaching the target value.

Further, the torsion shaft 3 is used to cross the elastic main axis of the second iron, the third iron, the fourth iron, and the fifth iron of FIG. The iron set of the fifth embodiment in which the torsion shaft 4 is used for the iron and the eighth iron so that the elastic main axis of the shaft intersects the specific plane described above is the fifth iron compared to the case where the iron set of the fourth embodiment is hit. It can be seen that the drop point of the ball when hit with an 8-iron is approaching the target value.

From the above results, when the shafts that bend and twist when a load is applied from the lateral direction to the low-numbered club and the high-numbered club are used, the trajectory of the club is corrected at the time of the swing and the club reaches the target value. It was confirmed that the hitting direction was corrected so that the ball approached.
Further, by using a shaft that causes the above-described bending and torsion for several clubs from the lowest count and several clubs from the highest count by the iron sets of Embodiments 4 and 5,
It was confirmed that the hitting direction as a club set was improved. Further, the mounting direction of the iron head is changed for several clubs from the lowest count and several clubs from the highest count, and the club whose crossing angle between the elastic main axis of the shaft and the above-mentioned specific plane is closer to the inner side (several clubs on the lower count side) Then, it was confirmed that if the clubs were set to be smaller, the club having a larger count, and the clubs having a smaller count in some of the higher counts), the directionality of the ball as a club set was further stabilized.

[0041]

As is apparent from the above description, according to the golf club iron set of the present invention, the required number of iron clubs on the low count side are twisted together with the shaft being bent at the time of swing, and the toe of the club head is twisted. The trajectory of the golf club whose side tends to enter the hitting position later than the heel side of the club head is modified so that the orientation of the face surface of the club head is true to the ball, and / or The required iron club on the count side is twisted together with the shaft being bent during the swing, and the trajectory of the golf club, which tends to enter the hitting position with the heel side of the club head behind the toe side of the club head, is shifted to the face surface of the club head. The golfer decided to correct the orientation of the ball against the ball. The club head is always oriented so that the face of the club head is almost identical to the ball without the need to consciously correct the change in the trajectory of the club when swinging the club and when swinging the iron club on the higher count side. Can be overtaken. Therefore, the ball can be hit relatively straight toward the destination no matter which club number is used.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a method of measuring a deflection amount and a twist angle of a club shaft.

FIGS. 2A, 2B, and 2C are diagrams illustrating the direction of load applied to a b club shaft.

FIG. 3 is a view showing the results of a hit ball test using a golf club iron set of a comparative example.

FIG. 4 is a diagram showing the results of a hit ball test using the golf club iron set of the first embodiment.

FIG. 5 is a diagram showing the results of a ball test using the golf club iron set of the second embodiment.

FIG. 6 is a diagram showing the results of a hit ball test using the golf club iron set of the third embodiment.

FIG. 7 is a view showing the results of a hit ball test using the golf club iron set of the fourth embodiment.

FIG. 8 is a view showing the results of a hit ball test using the golf club iron set of the fifth embodiment.

FIG. 9 is a schematic perspective view showing a pipe-like structure for explaining the principle of the present invention.

FIG. 10 is a sectional view of the pipe-shaped structure of FIG. 9;

FIG. 11 is a schematic diagram showing fiber angles of the pipe-shaped structure of FIG.

FIG. 12 is a schematic view showing a fiber angle of the pipe-shaped structure of FIG. 9;

FIG. 13 is a schematic view showing a deformation behavior of a pipe.

FIG. 14 is a schematic view showing a deformation behavior of a pipe.

FIG. 15 is a schematic view showing a deformation behavior of a pipe.

FIG. 16 is a schematic view showing a deformation behavior of a pipe.

FIG. 17 is a schematic view showing a deformation behavior of a pipe.

FIG. 18 is a schematic view showing a state where the club head is placed on the ground so as to have a predetermined lie angle γ.

FIG. 19 is a schematic diagram showing a state where the club head is placed on the ground so as to have a predetermined loft δ.

[Explanation of symbols]

 S Shaft l Deflection amount γ Rotation angle (torsion amount) 50 Wire 51 Weight 100a Large diameter end of shaft 100b Small diameter end of shaft 200 Chucking device

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A63B 53/00 A63B 53/10 B32B 5/12

Claims (4)

(57) [Claims] 1. A golf club iron set including a plurality of iron clubs having different counts, wherein at least one iron club forms at least a part of a club shaft with a fiber-reinforced resin, a fiber-reinforced rubber, or a rubber having orientation. And the fiber angle and / or orientation angle of the material having anisotropy is partially and circumferentially changed in the circumferential direction of the shaft. The club head at least in part of the
And the lie angle and loft angle of the golf club
When placed, 200 degrees from the grip side end of the shaft with respect to a specific plane parallel to the intersection line between the face surface of the iron head and the horizontal plane and including the geometric main axis of the shaft.
A golf club iron set comprising a club in which a plane including an elastic main axis and a geometric main axis when mm is fixed intersects at an intersection angle of 45 to 90 °. 2. An at least one iron club having an intersection angle of 45 to 90 ° between the specific plane and a plane including an elastic main axis of the shaft and a geometric main axis, wherein (a)
(B) Any one of the following and any one of the following, or (c) One of the following and the lowest iron club starting with the lowest iron club A few iron clubs on the low count side Highest iron clubs on the high side A few iron clubs on the high count side starting from the highest iron club and the space around the club head on the face side of the club head with a specific plane as the boundary When the space is divided into a space and a back face side space, the low count iron club in which the intersection angle between the specific plane and the plane including the elastic main axis and the geometric main axis of the shaft is 45 to 90 ° is the back face side. An elastic principal axis is arranged in a space, and an ironk on a high count side in which an intersection angle between the specific plane and a plane including the elastic principal axis and the geometric principal axis is 45 to 90 °. Bed golf club irons set according to claim 1 in which the elastic principal axis is arranged in the face-side space. 3. The low-numbered iron clubs starting from the lowest-numbered iron club are at least two or more clubs selected from iron clubs having a loft angle of 26 ° or less. 3. The golf club iron set according to claim 2, wherein the several high-count iron clubs starting from the highest iron club are at least two or more clubs selected from iron clubs having a loft angle of 36 ° or more. 4. . 4. An iron club having a number of low counts starting from a lowest iron count having an intersection angle between the specific plane and a plane including an elastic main axis of the shaft and a geometric main axis of 45 to 90 °. The lower the loft angle of the club, the larger the intersection angle between the specific plane, the elastic principal axis, and the plane including the geometric principal axis, and the difference between the specific plane, the elastic principal axis of the shaft, and the plane including the geometric principal axis. 4 crossing angles
Starting from the iron club with the highest count of 5 to 90 °, several high count iron clubs have a larger loft angle, and as the club has a larger loft angle, the intersection angle between the specific plane and the plane including the elastic principal axis and the geometric principal axis is larger. The golf club iron set according to claim 2 or 3, wherein the golf club iron set is larger.