JPH0751077Y2 - Iron golf club - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to an iron golf club.

[Conventional technology]

When the head of the conventional iron golf club is viewed from the toe side, as shown in FIG. 7, the leading edge 41 is located to the left of the right end 42a of the shaft 42 (direction of arrow B) (however, for the right side). . That is, the leading edge 41 at the lower end of the face surface 43 was in the arrow B direction by the dimension δ.

[Problems to be Solved by the Invention] When a golf ball is hit with the head of such a conventional golf club, as shown by an asterisk in FIG.
44 is always on the left of the center line 1 of the shaft 42 (in the direction of arrow B in the figure). That is, the hitting point 44 comes backward from the shaft center line 1 by the dimension C shown in the figure (because the hitting point 44 is on the face surface 43 and about 20 mm from the leading edge 41), and the center of gravity. The angle becomes large.

Therefore, when the ball hits the hitting point 44, the shaft 42 goes a little forward and the angle of the center of gravity makes it easy for the tip of the head to rotate with respect to (the center line l of) the shaft 42. Since it stands and rotates a little to make it easier to hook, it was a little difficult to raise the ball high, and the ball muscle was easy to hook.

[Means for Solving the Problem] In order to solve such a problem, the present invention sets the face progression to +8 mm to +15 mm, and
The center of gravity of the head was set approximately at the shaft center line.

However, when looking at the club head from the toe side, when the leading edge is to the right with respect to the center line of the shaft for the right, the positive progression is defined when the leading edge is to the right (in the case of the left, to the left) To do.

[Action]

The angle of center of gravity can be reduced. Further, as the iron set, it is easy to realize that the angles of the center of gravity are substantially the same.

Furthermore, whether the ball hitting point is on the extension of the center line of the shaft,
It will be to the right (front of the swing).

〔Example〕

 The present invention will be described below based on the illustrated embodiments.

In FIG. 1 and FIG. 2, an iron type golf club for the right is shown, 1 is a shaft, 2 is a club head,
3 is a face surface, and 4 is a leading edge at the lower end thereof.

FIG. 1 shows the right club head 2 viewed from the toe side. When the leading edge 4 is in the right direction with respect to the center line 1 of the shaft 1 of the right golf club, the positive progression P is defined (in the left golf club, the left direction is positive).

In the golf club according to the present invention, the face progression P is set to +8 mm to +15 mm. Further, the center of gravity G of the club head 2 and the hitting point 5 (indicated by a star) are set so as to be substantially on the center line 1 of the shaft 1.

Fig. 3 shows a long iron and Fig. 4 shows a short iron, respectively. Fig. 3, Fig. 1 and Fig. 4 show a part of a set from a long iron to a short iron. Then, it can be seen that the progression P is sequentially changed so as to be smaller for the long iron and larger for the short iron.

As a result, the center of gravity G of all the club heads 2 in the set is set to be on the center line 1 of the shaft 1.

Next, FIG. 5 shows a vertical direction when viewed from the direction of arrow F when a golf club is placed on a surface plate 12 having a horizontal surface 11 and the club head 2 is stationary outside the edge of the horizontal surface 11. If the angle θ formed with the plane is called the center of gravity angle (see FIG. 6), in the iron club set according to the present invention, the center of gravity angle θ ₁ is small and the center of gravity angle is as shown by the solid line in FIG. θ ₁ is the same in all the iron clubs in one set (substantially the same). This reduces the hook when hitting the ball.

On the other hand, in the conventional club head shown by the broken line in the figure for reference, the center of gravity angle θ ₂ is large, and therefore,
The hook becomes large.

In addition, the term "goose degree" is newly defined here, and the iron golf club of the present invention will be described more clearly (compared with the conventional one). As shown in FIG. 7, when the conventional iron golf club for the right side is viewed from the toe side,
If the goose degree is 0 when the leading edge 41 is at the right end 42a of the shaft 42 and the goose degree is plus in the left direction, the goose degree is + δ, and there is no negative goose degree in the conventional iron golf club. .

On the other hand, in the present invention, as shown in FIG. 1, the leading edge 4 is located to the right of the right end 1a of the shaft 1 (when the right iron golf club is viewed from the toe side). , Goose degree is minus-that is, (-
δ)-.

〔Experimental result〕

Therefore, Table 1 shows the results of a comparison test between an iron golf club according to the present invention, a No. 5 iron, with a progression P of +10 mm, and a conventional No. 5 iron with a progression P of +3 mm (referred to as a comparative example). Shown in. However,
Two-piece golf balls are used, each with 8
Each value is shown as an average value when hit by a swing robot, the ball height β is shown by an elevation angle as shown in FIG. 8, and the deviation of the falling point is shown by a chain line as shown in FIG. The deviation m to the left or right with respect to the reference line indicated by is shown by the distance m of the falling point with respect to the reference line.

From the results shown in Table 1, the ball height β of the embodiment of the present invention was 1.4 ° large, and the comparative example was hooked considerably (the drop point was shifted to the left by 8 m). It can be seen that the invented one fell to a straight spot.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects.

The center of gravity angle θ ₁ is small, and the number of hooks can be reduced. Further, as the iron set, the center-of-gravity angle θ ₁ can be easily aligned to be substantially the same.

Further, the ball hitting point 5 is located on the extension of the center line 1 of the shaft 1 (as shown by the star in FIGS. 1, 3, and 4) or to the right of it (in front of the swing). It is possible to raise the ball high.

[Brief description of drawings]

1 is a view from the toe side showing an embodiment of the present invention, FIG. 2 is a view from the heel side, and FIGS. 3 and 4 are long irons and short irons from the toe side, respectively. FIG. 5, FIG. 5 and FIG. 6 are explanatory views of a method for measuring the angle of gravity.
FIG. 7 is a view of a conventional club viewed from the toe side, FIG.
FIG. 9 and FIG. 9 are explanatory views of experimental measurement values. 4 ... Leading edge, P ... Progression

Claims (1)

[Scope of utility model registration request] 1. A face progression of +8 mm to +1
An iron golf club characterized in that the center of gravity of the head is set approximately on the shaft center line while being set to 5 mm.