JPH0626632B2 - Wood club head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is particularly suitable for amateur golfers. Regarding the head.

[Prior Art] In a conventional basic type wood club head, score lines engraved on the face are parallel to the sole. Unlike the swing of an iron club, the swing of a wood club hits the ball horizontally. The score line bites into the score line at the time of impact when the ball is launched high in a loft, and rotates the ball so that the ball rolls in the flight direction,
It helps the run to be very large and contributes little to the gear effect.

Gear effects occur especially in wood club heads. Since the depth of the center of gravity (distance from the face to the center of gravity) of the wood club head is large, it is possible to cause a side spin due to a gear effect on the ball when hitting with the sweet spot removed. To be more specific, when the sweet spot is removed to the toe side and hit in a square, the face instantly and rotationally opens due to the momentary action of the center of gravity at the moment of impact, and at that time there is no slip between the ball and the face. And the face rolls and contacts like two external gears that rotate the face to the right and the left side spin is applied to the ball, and the gear effect works. Further, when the sweet spot is removed to the heel side and hit in a square, the face is covered at the moment of impact, and at that time there is no slip between the ball and the face, so that a right side spin is applied to the ball.

The round face has a smaller gear effect than the straight face and has a better flight direction.

Since the iron club head has a very small depth of center of gravity, the gear effect is very small, and the side spin is rarely applied by the gear effect. The side spin caused by the iron club occurs because the ball is cut and struck so that the back surface of the ball is rubbed with the face (it is easy to hit the cut because it hits down blow), and when the right side spin is applied and when the face is opened. Sometimes the ball rolls until it leaves the face by hitting or covering and hitting the ball with right side spin or left side spin, and these side spins are not due to the gear effect.

A straight ball hit at a sweet spot by a wood club is higher than a draw ball or a fade ball, which has a low trajectory, and has a long flight distance. However, the maximum flight distance comes out slightly above the toe side of the sweet spot.
Specifically, align the swing trajectory with the target direction, or swing inside / out, and strengthen the cock reserve to make the face perpendicular to the trajectory direction from the moment of impact until the hit ball leaves the face. It is a draw-type ball with a high trajectory and a left side spin when hitting with maintaining and swinging, especially when hit at a point slightly off (about 2 mm) above the toe side of the sweet spot. The fall angle is shallow and the run becomes very large, resulting in maximum flight distance.

Therefore, even for amateur golfers, I want to hit a draw ball with a high trajectory that gives the maximum flight distance, but for an amateur golfer who is difficult to hit at the sweet spot, such a way is extremely difficult and there is nothing. equal. Moreover, an amateur golfer has a high risk of hitting a slice ball with his face opened due to various causes. In particular, advanced players often remove the sweet spot to the toe side. In this case, if the advanced player can swing the face squarely inside / out, even if the sweet spot is hit to the toe side, the left side spin will be applied due to the gear effect, so it will not be sliced. . However, if the advanced player can swing inside out but cannot keep the face square and opens, the gear effect will not occur and the left side spin will not occur and the face will follow the right direction. It flies in the direction of the ball and becomes a cut ball. In addition, it is difficult for beginners to hit at the sweet spot and, in contrast to advanced players, they are often removed on the heel side. Then, even if the beginner can swing the face squarely inside and out, by hitting the sweet spot to the heel side, the right side spin is applied, resulting in a slice ball and opening of the face. If there is a large slice ball. In addition, the sliced ball is inside
Even if you swing in or outside in, you may hit it because the face is open.

In this way, amateur golfers often open their faces in the track direction of the swing and hit the slice ball at a high risk, and the risk of hitting the hook ball with the face on the track. Is extremely small.

From the above, it can be said that a wood club suitable for an amateur golfer is a wood club that fly left.

Therefore, if the ball tends to rise high, the gear effect of left side spin works less in the half closer to the toe side of the face, and the gear effect of right side spin works less in the half closer to the heel side of the face than before. If there is such a wood club head, it will be a very convenient wood club head for an amateur golfer who can hit a ball with a high trajectory and a good direction, and furthermore, the wood club is used even from the beginner's time to the advanced player. You can, and the usability of the club comes out consistent.

Next, as another problem of the wood club head, the wood club head used by the advanced player is on the upper part of the left wooden surface forming the face, and the wood club head used by the beginner is on the right side forming the face. Each of them has a tendency to break at the bottom of the wooden surface. This is because, as described above, advanced players often remove the sweet spot to the toe side, and beginners often remove the sweet spot to the heel side.

Furthermore, another problem with the wood club head is that when addressing, it is necessary to accurately judge for each hole whether the face is facing a square with respect to the target direction or the direction of the track to be swung. Is difficult because it has a loft on the face, a gentle arc on the top edge of the face, and a round face. On the other hand, conventionally, the wood club head has not been provided with an appropriate guide for determining whether or not the face faces the square.

[Problems to be Solved by the Invention] The present invention has a characteristic that the gear effect of the left side spin is smaller than that of the conventional one in the portion close to the toe side of the face, and it is easy to raise the ball easily and provide a flight distance. The main purpose of the present invention is to provide a wood club head having a characteristic that the gear effect of the right side spin is smaller than that of the conventional one in the portion closer to the heel side of the face, and that the ball can be easily raised high and the flight distance can be easily achieved. I am trying.

Another object of the present invention is to provide a wood club head whose face is improved so as to improve the flight distance as well as the durability.

It is a further object of the present invention to provide a wood club head that has received a proper indication for determining whether the face is square oriented.

[Means for Solving the Problems] In the wood club head of the present invention, in order to achieve the above main object, the score lines 2 of the V grooves parallel to each other with a predetermined pitch engraved on the round face 1 have the shaft axis. It is configured so as to be inclined at an angle of about 90 ° with respect to 3.

In addition, in the round club head of the present invention, in order to improve the ground face so as to improve the flight distance as well as the durability, the insert 4 provided at the center of the round face 1 has the upper part closer to the toe side. The lower part is inclined toward the heel side.

Furthermore, the round club head of the present invention, as an appropriate guide for determining whether the face is squarely oriented, the top 6 of the club head has the extension line extending substantially parallel to the face 1 and passing through the shaft axis 3. The target line 10 is drawn in the line.

[Operation] First, what kind of ball can be hit by the portion of the wood club head of the present invention that is closer to the toe side of the face will be described.

Now, when you swing inside and out, and make the face square (right angle to the direction of the swing) and remove the sweet spot to the toe side, the ball hits the sweet spot side due to the gear effect with the club head. However, since the scoreline 2 is inclined to the upper left, the resistance to bite into the ball by the scoreline 2 causes the gear effect of moving horizontally as in the past to be changed upward. , There is a gear effect in which the scoreline 2 tries to roll up at a right angle.

The horizontal component of the gear effect is smaller than the gear effect of moving horizontally toward the sweet spot side as in the conventional case, and the left side spin is smaller than in the conventional case. Therefore, the directionality of the flying ball is small. It becomes a draw type ball, and the danger of a hook ball turning left greatly is reduced. Then, due to the vertical component of the gear effect, a spin is applied so that the ball rises higher, which makes it easier to hit the ball in a high trajectory.

Further, while the wood club head makes an arc motion for about 10 cm from the moment of impact until the ball leaves the face, the inertia of the ball tends to fly tangentially from the moment of impact. Although the ball tries to escape to the toe side, which leads to hitting the slide ball, in the present invention, the score line 2 inclined to the upper left goes into the ball and the ball runs to the toe side. It has a function of pulling up the ball as well as catching it so that it has a function of catching the ball in the center and launching it high.

Furthermore, since the score line 2 inclined to the upper left goes into the ball and catches it so that the ball does not escape to the toe side, even if the face is slightly opened and hit, the right The side spin can be suppressed to be small, and it becomes easy to avoid a large slice ball.

In addition, when hitting the ball with an iron, if the ball hits the sweet spot and the face is hit at right angles to the swing trajectory direction, the ball will be subjected to reverse spin by rotating in a vertical plane due to loft and down blow. It flies straight in the orbital direction. At this time, the horizontal score line works to easily penetrate the ball and cause reverse spin. If the score line is engraved on the upper left of the face, the score line will try to escape the ball to the toe side when down blow, so the flying ball will have a slight right side spin. Reverse spin,
It will curve slightly to the right. As you can see, it is clear that when you hit the ball with the face opened with an iron club with a score line sloping to the upper left, it will fly more to the right, making it easier to hit the slice ball. . Therefore, it is not possible to adopt the score line inclined to the upper left to the iron club, but not to the amateur club. It should be noted that amateurs have a large loft for irons and cover the lower end of the shaft, so it is scary to hit the heel side of the face, and often hits the toe side.

Next, what kind of ball can be hit with the portion of the face of the wood club head of the present invention that is closer to the heel side will be described.

When swinging inside-out and hitting the square with the face square (right angle to the direction of the swing) and removing the sweet spot to the heel side, the ball is still on the right side due to the gear effect with the club head. Spins and flies away. The ball rolls to the sweet spot side due to the gear effect until it separates from the face, but at this time, since the score line 2 is inclined to the upper left, it slightly rolls to the sweet spot side.

Therefore, the horizontal component of the carry effect is smaller than the gear effect of horizontally moving to the sweet spot side as in the conventional case, and the right side spin is smaller than in the conventional case. Is a small fade type ball, which reduces the risk of a sliced ball turning to the right. Then, the vertical component of the gear effect causes a high spin to be applied to the ball, which makes it easier to hit the ball in a trajectory higher than in the past and provides a long flight distance.

[Embodiment] FIGS. 1 to 4 show a wood club head according to an embodiment of the present invention.

In the figure, 1 is a face, 2 is a score line, 3 is a shaft axis, 4 is an insert, 5 is a sole, 6 is a top,
7 is a toe, 8 is a heel, 9 is a sweet spot, and 10 is a target line.

The wood club head of this example has a loft of 8 to 10 °.
Round face 1 has V-groove scorelines 2 parallel to each other at a certain pitch and about 90 ° to shaft axis 3.
Is inclined so that the angle becomes. The score line 2
If the lie angle is about 53 to 55 °, it means that it is inclined to the upper left at about 37 to 35 ° with respect to the glide line.
According to the golf club standard, the score line 2 is a V-groove line having a groove width of 0.9 mm, a depth of 1 mm or less, and a pitch of three times or more the groove width.

Further, the insert 4 provided at the center of the face 1 is inclined so that the upper portion is closer to the toe side and the lower portion is closer to the heel side. Specifically, it is inclined with respect to the shaft axis 3 at about 45 °.

A target line 10 is drawn on the top surface 6 of the club head so that the extension line passes through the shaft axis 3 substantially in parallel with the face 1, and the sole 5 is a spherical surface having a small radius of curvature to reduce duffing. It is a sole.

B1 is a circle showing the ball position with the sweet spot removed to the upper part on the toe side, and the gear effect caused by the score line 2 inclined to the upper left moves the ball to the upper left side spin. Compared to the gear effect that occurs, you can hit a draw type ball with a long trajectory with less leftward curve. B2 is a circle showing the ball position where the sweet spot is removed to the lower side of the heel side, and the gear effect of the right side spin is mitigated by the score line 2 inclined to the upper left, so that the gear effect produced by the conventional horizontal score line Compared to, there is less curve to the right and there is less risk of becoming a sliced ball than before. In any case, since the insert 4 is inclined toward the toe side at the upper part and inclined toward the heel side at the lower part, the probability of hitting with a hard face surface is increased and the flight distance is improved, and at the same time, the face is improved. Durability is improved.

[Effect of the Invention] As described above, according to the golf club of the present invention, the Vs parallel to each other at a predetermined pitch engraved on the round face are provided.
Since the score line of the groove is inclined so that it makes an angle of about 90 ° with the shaft axis, the gear effect of left side spin works smaller than before and the ball is closer to the toe side of the face It has the characteristics that it is easy to raise it high and that the flight distance is easy.In addition, the gear effect of the right side spin is smaller than before in the part close to the heel side of the face and it is easy to raise the ball easily and the flight distance is good. Therefore, it is consistent with the fact that the amateur golfer wants to hit a ball with a high trajectory and draws a long flight distance, and that a wood club suitable for an amateur golfer is a wood club that fly to the left. , A very convenient wood club head that can obtain good distance and direction for both beginners and advanced players, and
The wood club head can be used even from an early age to an advanced player, and has an excellent effect of having consistent usability of the club.

[Brief description of drawings]

1 is a front view, FIG. 2 is a plan view, FIG. 3 is a bottom view, FIG. 4 is a left side view, and FIG. 5 is a right side surface. It is a figure. 1 ... face, 2 ... score line, 3 ... shaft axis, 4 ... insert, 5 ... sole, 6 ... top, 7 ... toe, 8 ... heel, 9 ... sweet spot, 10 ... … Target line.

Claims (3)

[Claims] 1. A score line of V grooves parallel to each other at a predetermined pitch engraved on a round face has about a shaft axis.
A wood club head characterized by being inclined to form an angle of 90 °. 2. The wood club head according to claim 1, wherein the insert provided at the center of the round face is inclined so that the upper portion is closer to the toe side and the lower portion is closer to the heel side. 3. The wood club head according to claim 1, wherein a target line is drawn on the top of the club head so that the extension line passes through the shaft axis substantially in parallel with the round face.