JPH11309232A - Golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily give an impact feeling to a beginner and to obtain how to swing a golf club by forming a face of a club head a recess surface against a flying line. SOLUTION: A face 4 of a club head 2 is formed smoothly curved recess surface against a flying line 5. This recess surface may be a shape curved to up and down directions against the flying line 5 (up and down directions of the ground) or a shape curved to right and left directions of the flying line (near side and far side to a person to swing the golf club). The curved shape has a curving rate smoother than each edge of the club and is desired to continuously change. The curved lines can be variously provided to shots to be desired such as high, low, sliced or hooked shots. This recess surface prolongs a time that a ball contacts with the face 4 at an impacting instance, so the swinging person can easily feel a motion of the ball during the impact. Thereby the swinging person can feel the impacting instance by his own hands.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes it easy for a beginner to easily feel the impact of hitting a ball when practicing golf, and to learn while understanding how to swing the hit ball further. To a practice golf club.

[0002]

2. Description of the Related Art In a golf game, how to hit a ball is one of the most important basic elements. That's because it depends on how you hit the ball. Therefore, it is one of the things that must be practiced with the most care for the beginners including golf beginners. In the practice of hitting a ball so far, a golf club in which the face 4 portion of the club head 2 is flat or somewhat convex as shown in FIGS. 6 and 7 is used due to rules for playing golf. In these figures, the loft 8 is the angle of the face 4 of the club head 2 with respect to the shaft 1, and the loft 8 has a small angle of 6 degrees and a large loft 8 has an angle of about 60 degrees. The degree of escape of the force at the moment when the ball is hit by the loft 8 changes, so that each club can hit the ball separately. It is indispensable for the trainee to understand the direction in which the force is applied (escape) at the moment the ball is hit (impact) to improve the golf. However, in actual practice, when the ball hits the face, the bonding surface between the ball and the face is small, so that the ball is quickly popped out as shown in FIG. Since the contact time between the ball and the face was extremely short, it was difficult for the trainee to imagine how the ball hit the face.

[0003]

In the practice using the conventional golf club described above, since the moment when the ball hits the face is very short, the trainee cannot sense the moment of impact, and the trainee cannot understand the moment of impact. There was no proper way other than judging whether the ball was hit or not depending on how the ball flew.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to make it easy for a beginner to feel the impact at the moment of hitting a golf ball and to swing the ball to be hit farther. It is an object of the present invention to provide a golf club for practice that can be learned while understanding.

[0005]

SUMMARY OF THE INVENTION The present invention makes it easier to feel the impact at the moment of hitting a golf ball, and understands how to swing a hit ball further away or to hit the ball in the direction desired. The object of the present invention is achieved by making the face of the club head concave with respect to the flying ball line.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an example of a cross section of a golf head having a slightly curved concave face 4. The feature is that the face 4 is concave with respect to the flying ball line 5. The concave surface of the club face may be curved vertically (up and down on the ground) with respect to the flying ball 5 as shown in FIG. 2, and furthermore, as shown in FIG. The shape may be curved to the side (the side facing the front side of the swinging person). The shape of the curve may be changed continuously with a gentler curvature than each edge of the club, and the curve may have various curvatures depending on the shot (high / low, slice, hook) to be hit.

FIG. 2 illustrates how the force exerted on the ball when it hits the face 4 of the concave golf club. Ball 6 is club head 2
It can be considered that the club head 2 hits the ball 6 almost horizontally with respect to the ground at the moment of hitting. At the moment of impact, the ball 6 receives a force F in a direction horizontal to the ground. Assuming that a tangent at the contact point P between the face 4 and the ball 6 is m, and that a line perpendicular to the tangent m and passes through the point P is n, the force F received by the ball 6 is decomposed into components F _m and F _n in the respective directions. it can. The force F _{m moves} the ball 6 in FIG.
It has the function of rotating in the direction of the arrow 7 inside. Due to this rotation, a frictional force F ′ is generated between the ball 6 and the face 4, and the frictional force F ′ gives a force for the ball 6 to move on the face 4. Here, since the face 4 has a concave surface with a curvature, the frictional force generated by the rotation of the ball
Since F ′ has the effect of causing the ball to slide up along the concave surface, the time during which the ball 6 is captured by the face 4 at the moment of impact can be extended. FIG. 4 shows the movement of the ball 6 occurring during this time. With this principle, a golf practitioner can actually sense the very short moment of impact experienced by a professional or advanced player during a swing with his own hands.

The club face does not have to be simply concave, but the curvature of the face needs to be changed depending on the material used for the club head, and the effect differs depending on the head speed of the trainee. It is necessary to have a practice golf club with a large curvature.
FIG. 5 shows an example of the shape of a training golf club having a concave surface in the vertical direction with respect to the flying ball line. FIG. 7A has a fan-shaped cross section with a central angle of approximately 90 degrees, FIG. 7B has a substantially semicircular cross section, and FIG. In the figure, (D) has a certain curvature at the lower part of the face, but is straight on from the middle part to the upper part in FIG.

When the golf club head is made of a hard material, the contact time between the ball and the club head at impact is extremely short, so that the curvature of the face should be increased. Frictional force F 'becomes large caused by the impact by increasing the curvature of the face, it is possible to increase the contact time between the ball and the face by working large force F _m Gayori that slides up the face, impact as a result Will be able to feel the moment for a long time.
Conversely, when the golf club head is made of a soft material, the curvature of the face may be reduced.

In addition, a person having a low golf club head speed at the time of a swing exerts a smaller force on the ball after impact as compared with a person having a high head speed, so that the contact time between the ball and the face is reduced by both. To achieve the same, the curvature must be increased. By changing the curvature of the face according to each head speed in this way, it is possible to easily capture the moment of impact.

[0012]

As described above, according to the golf club for practice of the present invention, the golf practitioner himself / herself can experience the touch at the moment of impact, which has been difficult with conventional golf clubs. Then, when swinging in a normal club, the practicer can easily understand the right or wrong of hitting from the feel at the moment of impact.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a head portion of a practice golf club of the present invention.

FIG. 2 is a cross-sectional view for explaining a relationship between forces applied to a golf ball at the time of impact of the training golf club of the present invention.

FIG. 3 is a view showing an example of a head portion of the training golf club of the present invention.

FIG. 4 is a view schematically showing a state at the moment when a ball jumps out when swinging with the training golf club of the present invention.

FIG. 5 is a view showing a modification of the shape of the golf club for practice of the present invention.

FIG. 6 is a diagram showing a shape of a head portion of a conventional golf club.

FIG. 7 is a diagram showing a shape of a head portion of a conventional golf club.

FIG. 8 is a view continuously showing the state at the moment when a ball jumps out when swinging with a conventional golf club.

[Explanation of symbols]

 Reference Signs List 1 shaft 2 club head 3 sole 4 face 5 flight line 6 golf ball 7 ball spin direction 8 loft

Claims (3)

[Claims] 1. A practice golf club characterized in that the club face is concave with respect to the flying ball line so that a trainee can feel the moment of impact. 2. The training golf club according to claim 1, wherein the club face is a concave surface in a vertical direction with respect to the flying ball line. 3. The training golf club according to claim 1, wherein the club face is also concave in the left-right direction with respect to the flying ball line.