JPH0414037B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a practice golf club that can improve the practice effect to an extent that cannot be found anywhere else, even when using a small-scale golf practice net for home use. .

In order to hit a golf ball straight, you need to have a good grip, good stance, and good address as ``static'' motions, and then swing the ball correctly on the trajectory that is ``moving''. In general, it has been said that there are three types of club head swing trajectories, as shown in FIGS. 1a to 1c. In other words, a is outside-in, b is inside-out, and c is inside-in. It is thought that a and b are inappropriate and that professional golfers and advanced golfers swing in c. There are practice mats available on the market. However, by mastering the inside-in swing of c.
Golfers are well aware that it is extremely difficult to match the target direction Q with the target direction Q.

Therefore, the inventor proposed that if the golf ball 1 is hit in a straight line in the front and back in the impact zone,
Based on the idea that it is not very difficult to hit the ball straight, we first developed a new swing method that swings the club head in a straight line, using a swing similar to the playground track shown in Figure 2. He was the first to propose a swing practice table.

The main points of the new swing method mentioned here are as follows.

The golf swing can be broadly divided into two types: the take back swing and the back swing.

To perform a takeback, first step in the direction of the arrow after address in Figure 2, firmly pressing your feet from the base of your left and right big toes to the arches of your feet and determining the center line of your body.

The first movement is to pull only the arms back 35 to 70 cm without moving the shoulders or breaking the triangular shape of the left and right arms, and position the club head 2 in a straight line. At this time, the club head 2 moves within a range of 80 to 100 cm, and then reaches the limit where the shoulders must turn.

The second movement is to rotate the shoulders and hips, keep both arms in a triangular shape, and swing the club up to the top while swishing the left wrist, at which point the takeback is completed. At this time, the shoulders are rotated 90 degrees, the back is facing the direction of the ball, the hips are twisted 45 degrees, the left knee is pulled toward the right knee, and the right foot is approximately
90% of your body weight is on it. However, even in this big backswing, the center line from the base of the back of the neck to the coccyx at the bottom is firm and grounded, as the area from the base of the big toe of the right foot to the arch of the foot is grounded firmly. It is held in its original position and the position of the head is not in a swaying position.

Next, enter the downswing. The third movement is started by slightly kicking the ball of the big toe of the right foot while simultaneously moving the right hip, and at the same time, the left knee is also forcefully moved horizontally to the left and parallel to the batting line. However, due to this parallel and horizontal movement, a large and powerful rotation of the shoulder, which has been twisted by a large 90°, begins. Then, with a slight delay while maintaining the kotuku, both arms, which are relaxed, enter the impact zone from the position shown in Figure 2, with the arms still holding the triangle shape.

By maintaining the above posture, the club head will take a straight course before entering the impact zone, and your left wrist will naturally release its grip just before impact, allowing you to deliver a powerful impact punch to the golf ball. The body then enters the follow-through state, and the acceleration caused by centrifugal force transforms it into rotational force, causing the hips to rapidly rotate and result in a fight. At this time, the centrifugal force of the club head also causes the right knee to be sent about 30 cm to the left side, and it comes to be diagonally aligned with the left knee.
The club head can swing a long distance of about 60 to 80 cm, including the impact zone, while keeping the trajectory of the follow-through zone straight.

Such a swing method has not yet been proposed, and all known hitting methods, including the American hitting method, involve unscrewing the hips to move inside-in as shown in Figure 1 (c), and move the wrist from the impact of the ball to the follow-through. The best technique was to switch points by returning the ball and pull out in a straight line, and it was an extremely difficult technique to master.

The present inventor has previously developed and proposed a golf swing practice table in order to effectively learn the above-mentioned new swing method in a short time. The purpose of this practice table is to learn by sounding whether or not the club head is swung correctly in a straight line from the impact zone to the follow-through zone. Its structural features are that, as shown in Figure 3, a straight line 4 is displayed in the center of a conventionally used rectangular golf mat 3 that is long in the swing direction, and a tee-up pin can be attached and detached in the center. For the flocked pine with hole 5,
A circular elastic piece 6 of a size similar to a golf ball is removably installed in the hole for attaching and detaching the tee-up pin, and a flat-shaped elastic body piece 6 that is made to make a sound by the punched club is installed at the center of the tip line in the flight direction. elastic body 7,
This is due to the fact that two pieces of 8 were installed upright.

According to the golf swing practice table proposed above, when the club head is punched in a straight line in the target direction Q in the impact zone, the two elastic bodies 7 and 8 make a loud sound, and the rest of the swing is affected. When the impact is made, different small sounds are produced, and the state of the impact can be discerned with the ear. This also applies when a golf ball is hit on this practice table instead of using the circular elastic piece 6.

By the way, if you use a golf net installed at home or work using a practice table like the one above, and actually hit a golf ball from 8 meters away,
The largest commercially available golf net is 3 m wide, 3 m high, and 3 m deep, so the net is as shown in Figure 4. If you hit the ball horizontally with a driver with a loft angle of 10° to 12°, it will hit the center of target 12 or above it, but with a 3 iron with a loft angle of 24°, the ball will fly to the top of the net, so the accuracy of the ball hit at that time will be affected. It is impossible to know. Since this is the case with the 3-iron, the 4-iron with a loft angle of 27 degrees is out of the question as it will fly out of the net. Utility Model Application No. 57-134063 has multiple grooves in the longitudinal direction of the grip, and Utility Model Application No. 54-157664 has a handprint imprinted on it, but these do not make it possible to grip the grip correctly. 4.
In the same way as mentioned above, if you use irons that are higher than that, if they fly out of the net, you will get hit.

Therefore, the inventor of the present invention has conducted various studies to ensure that the above-mentioned practice using a net can be performed in the same way as using several types of iron clubs, and the loft angle of the iron head should be within the range of 10° to 12°. The length from the sole is made constant, and the length from the sole is made to be a length that spans multiple numbers, and a mark corresponding to the length from the sole according to the number of each iron club is marked on the grip part, so that an arbitrary grip position can be selected. Therefore, we decided to obtain the same effect as using a specific iron club.

The present invention will be explained in more detail below with reference to the drawings.

FIG. 5 is a front view of the head portion of the golf club for ball hitting practice according to the present invention, and FIG. 6 is a front view of the grip portion. Since the shaft is the same as the conventional product, illustration thereof is omitted. As is clear from these figures, although the golf club for ball hitting practice of the present invention is an iron club, the loft angle α of the head 9 is low. In the illustrated example, α=12°. The loft angle α is not limited to this example, but is preferably in the range of 10° to 12°. With such a loft angle,
If the ball is hit correctly, the ball will fly to the front of the net, increasing the effect of practice. In the present invention, the grip 10 has also been devised, and as shown in FIG.
Mark 1 corresponding to the length from the sole in order from the end of
1 is provided. If you randomly select mark 11 and hold it during practice, it will be the same as holding any iron. This mark 11 may correspond only to numbers 3 and 4, or only to numbers 5 and 6. Further, lengths corresponding to numbers 7, 8, and 9 may be used. Furthermore, you can practice with wood as well, in the same way as with the irons above, by marking wood numbers 2 to 5 on the grip of your driver.

Since the product of the present invention has the structure as described in detail above, it is possible to practice hitting each iron using a small golf net without going to a driving range. It is possible to practice irons of all numbers with one or two or three iron clubs. If you can reliably hit the target with a horizontal strike, you will understand why each iron club (the one you actually use on the course) has its own loft angle.
It's perfect for beginners and average golfers who want to hit the ball further even though it has a loft angle.

[Brief explanation of drawings]

1A to 1C are schematic plan views showing a conventional swing pattern, and FIG. 2 is a schematic plan view showing a swing pattern which is the basis of the present invention. FIG. 3 is a perspective view of the golf swing practice stand. FIG. 4 is a side view of the net showing the appearance of a fly ball. FIG. 5 is a front view of the head portion of the iron club according to the present invention. FIG. 6 is a front view of the grip portion. 9...Head, 10...Grip, 11...Mark, α...
loft angle.

Claims (1)

[Scope of Claims] 1. The loft angle of the club head is kept constant at a low loft angle, the length from the sole is made to span a plurality of club numbers, and there is a mark on the grip portion corresponding to the length from the sole according to the number of each club. A golf club for ball hitting practice, characterized by being attached with. 2. The club is an iron club with a loft angle of 10 to 12 degrees, and the grip length is a 3 iron.
A golf club for ball hitting practice according to claim 1, wherein the marks provided on the grip are numbers 4 to 9.