JPH071167Y2 - Golf club shaft mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a shaft mounting structure for a metal hollow golf club.

(Prior Art) In recent years, golf club heads made of metal (commonly called metal wood) have become widespread, but the specific gravity of the metal of the material is very large compared to conventional wood heads. A big problem is how to make the weight of the head equal to that of the wooden head.

One of the solutions is to use a hollow structure, but even with the hollow structure, there are strength problems, and at the beginning of the spread of metal heads, the same size as conventional wooden heads ( Volume) makes it heavier than the wooden head, so at first glance I could only make a metal head that was smaller than the wooden head. After that, a technology was developed to make the outer shell of the head thin in terms of strength, and metal heads having a size (volume) almost similar to wooden heads have also been manufactured.

However, even in this case, the neck portion for connecting the head and the shaft is required to have a certain strength because a very large impact force is applied at the time of hitting the ball. The weight ratio of the parts was large. When the weight of the neck portion increases, the position of the center of gravity of the entire head approaches the neck portion to a high position, and also approaches the heel.

The optimum position for hitting the ball is called the sweet spot, and the sweet spot is the intersection of the perpendicular line from the center of gravity of the head to the face surface and the face surface, and the sweet spot is usually located at a low position in the center of the face surface of the head. It is easy to do. However, since the center of gravity of the metal head, which has a heavy weight in the neck portion, is located higher toward the heel as described above, the sweetsport has a problem that it moves away from the ideal hitting position.

To solve these problems and set the sweet spot to a low position in the center of the face, reduce the proportion of the weight of the neck that occupies the head, and further, reduce the weight of the neck to the toe or sole of the head. It is good to place it in the club.

Therefore, by extending a cylindrical portion for connecting the head and the shaft of the neck portion to the inside of the head main body, an unnecessary upper portion is cut, and the center of gravity is made closer to a lower position in the center of the face surface. . To give an example of these, the actual exploitation numbers Sho 59-93564, 102060 and Shoko 60-317.
42 and 61-33971. However, these devices have the following drawbacks.

First of all, in the two cases of No. 59-93564 and No. 102060, the method of fixing the cylinder to the neck for connecting the head and the shaft is not sufficient, so the impact of the ball hits the cylinder. There is a risk that the shaft may move within the neck and the mounting angle of the shaft to the head (lie angle, loft angle, face angle) may change.

In Japanese Utility Model Publication No. Sho 60-31742, ribs are provided between the cylindrical portion for connecting the head and the shaft and the inner surface of the neck portion. By providing the rib, the problem that the mounting angle of the shaft and the head changes as described above can be solved, but in order to realize this, it is necessary to firmly move the cylindrical part so that it does not move to the front, back, left or right. In order to fix the ribs, the ribs at two locations are insufficient, and it is necessary to provide the ribs at at least three locations, and the ribs themselves need to have a considerable thickness. Therefore, in this invention, the weight ratio of the neck portion to the entire head can be reduced to some extent, but there is a drawback that the weight increase of the rib having a considerable thickness reduces the effect.

Also, in Japanese Utility Model No. 61-33971, the problem that the mounting angle of the shaft and the head changes can be solved, but the cylindrical part has a sole inside the head more than the bonding cost required to connect the shaft and the head. Since it is extended to the portion, the increase in the weight of the cylindrical portion beyond the bonding margin reduces the effect of reducing the weight ratio of the neck portion to the entire head.

(Problems to be solved by the device) Therefore, the device of the present invention improves the mounting method of the cylindrical portion for connecting the head and the shaft extended inside the head body to the outer shell of the head, so as to prevent the impact at the time of hitting the ball. Provided is a golf club shaft mounting structure which has sufficient strength and can be used for increasing the weight of the neck portion, arranging the excess weight equivalent amount on the toe portion or sole portion of the head, or for enlarging the head body. Is what you are trying to do.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a do shaft of a golf club for mounting a shaft to a shaft mounting portion provided near a heel portion of a metal hollow club head (1). In the mounting structure, the shaft mounting portion includes a tubular neck portion (3) for connecting the head outer shell (8) and the shaft, and a heel wall portion of the heel portion (4) of the head outer shell (8). A lower end portion of the tubular neck portion (3) extends into an inner region of the head outer shell (8) and displaces the tubular neck portion (3) downwardly in general and The tubular neck portion (3) terminates in an inner region, and the tubular neck portion (3) is located on the heel wall portion side, and the entire extending portion of the wall body of the tubular neck portion (3) is formed by the heel wall portion. The wall of the tubular neck portion (3) and Part (4)
It is configured to be integrated with the wall body.

Further, in a preferred embodiment of the present invention, the tubular neck portion (3) is formed in a cylindrical shape, and a part of a peripheral wall of the tubular neck portion (3) is formed by the heel wall portion. There is.

(Operation) Since the present invention is configured as described above, since the cylindrical neck portion or the cylindrical portion for connecting the head and the shaft is a part of the outer shell of the head, it is possible to protect against impact at the time of hitting a ball. Can withstand enough.

Also, part of the tip of the cylindrical neck part or the cylindrical part for connecting the head and the shaft extends to the inside of the head and the outside is made short, so the center of gravity should be close to the low position in the center of the face. In addition, the cylindrical neck portion or the cylindrical portion becomes a part of the head outer shell, and the cylindrical neck portion or the cylindrical portion which exceeds the adhesion margin can be cut without adding extra weight to the neck portion. Therefore, the weight of the neck portion occupying the entire head can be reduced.

(Embodiment) FIG. 1 is a sectional view of an embodiment of a metal hollow golf club head of the present invention, in which a cylindrical portion 3 for connecting the head and the shaft constitutes a tubular neck portion, and a heel portion 4 Outer shell 8
Form a part of. The shaft mounting portion includes the cylindrical portion 3 and the wall portion of the heel portion 4. A portion of the tip portion 9 of the cylindrical portion 3 extends inside the head, and an outer portion 10 of the cylindrical portion 3, that is, a portion extending outward and upward from the outer shell 8 of the head, is a club of the prior art shown in FIG. Cylindrical part 3'in the head
It is shorter than the outer part of. That is, the cylindrical portion 3 of this embodiment is displaced downward from the cylindrical portion 3'of the club head shown in FIG. 3, and its tip portion is arranged inside the club head. Further, the cylindrical portion 3
Is the heel portion 4 of the outer shell 8 of the club head.
Forming the heel wall portion of. That is, a part of the wall body forming the heel portion of the outer shell 8 of the club head and a part of the wall body of the cylindrical portion 3 are shared. Therefore, the amount of metal material used for forming the cylindrical portion 3 for connecting the head and the shaft can be reduced, and the weight of this portion can be reduced. Then, this reduced weight is added to, for example, the sole portion 5 of the head so that the center of gravity 7 is located at a low position in the center of the face surface which is optimal for hitting a ball.

(Effect of the Invention) With the shaft mounting structure of the present invention, since the cylindrical portion 3 for connecting the head and the shaft is a part of the head outer shell 8, it is possible to sufficiently withstand the impact at the time of hitting the ball. Therefore, there is no possibility that the cylindrical portion 3 moves and the mounting angle between the shaft and the head changes.

Further, a part of the tip 9 of the cylindrical portion 3 for connecting the head and the shaft extends to the inside of the head, and the outside 10 of the cylindrical portion 3 is connected.
Since the length is short, the center of gravity 7 can be brought close to a low position near the center of the face surface.

Further, the cylindrical portion 3 is a part of the outer shell of the head, and the cylindrical portion that exceeds the bonding margin is cut without adding extra weight to the neck portion 3 to reduce the weight of the neck portion occupying the entire head. Therefore, by adding the reduced weight to the toe part 6 and the sole part 5 of the head,
The center of gravity 7 can be brought closer to a lower position in the center of the face surface which is most suitable for hitting a ball, and the head can be made larger, so that the freedom of design of the hollow metal golf head is expanded.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the metal hollow golf club head of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a conventional popular metal hollow golf club head. FIG. 3 is a cross-sectional view, and in FIG. 3, members having substantially the same function as the members in FIG. 1 are indicated by corresponding reference numerals with dashes. 1: Head, 2: Neck part, 3: Cylindrical part, 4: Heel part, 5: Sole part, 6: Toe part, 7: Center of gravity, 8: Outer shell, 9: Tip, 10: External.

Claims (2)

[Scope of utility model registration request] 1. A shaft mounting structure for a golf club for mounting a shaft to a shaft mounting portion provided near a heel portion of a hollow metal club head (1), wherein the shaft mounting portion comprises a head outer shell (8). A tubular neck portion (3) for connecting the shaft and the shaft, and a heel wall portion of the heel portion (4) of the head outer shell (8), wherein the lower end portion of the tubular neck portion (3) is In order to displace the tubular neck portion (3) generally downwards, the tubular neck portion (3) extends into and terminates in the inner region of the head shell (8). A wall portion of the tubular neck portion (3) located on the heel wall portion side is entirely formed by the heel wall portion, and the wall body of the tubular neck portion (3) and the heel portion. Characterized by being integrated with the wall of (4) Shaft mounting structure of Rufukurabu. 2. The tubular neck portion (3) is formed in a cylindrical shape, and a part of a peripheral wall of the tubular neck portion (3) is formed by the heel wall portion. Item 1. A golf club shaft mounting structure according to item 1.