JPH0673560B2 - Golf club set - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of use) The present invention relates to a golf club set including a plurality of golf clubs each having a different count using a fiber reinforced plastic shaft, and particularly to each club. Relates to a golf club set having an improved shaft.

(Prior Art) Generally, there are golf clubs such as driver clubs, spoons, and buffies such as wood clubs 1 and 3, and iron clubs 3 to 9 and various types such as pitching and sand wedge. A golf club set is an appropriate collection of a plurality of different clubs.

The smaller the club, such as the driver's wood club or long iron, the longer the shaft and the smaller the loft angle of the head face, the lower the trajectory and the longer the flight distance. Conversely, the larger the club (short iron), the shorter the shaft and the larger the loft angle of the face of the head, which increases the trajectory and shortens the flight distance. Taking advantage of such characteristics of each count club, the golfer plays by using each club according to the situation.

The shaft of each club in such a golf club set is
There are those made of steel and those made of fiber reinforced plastic such as carbon. Since the former steel shaft is heavier, the longer the club, the greater the moment of inertia about the grip end as the center of rotation, and the faster the head speed and the longer the flight distance. On the other hand, the latter club that uses a shaft made of fiber reinforced plastic is lightweight, and even a long club has a small moment of inertia with the grip end as the center of rotation, which increases the head speed and extends the flight distance. It is getting more and more.

(Problems to be Solved by the Invention) By the way, in the golf club using the fiber-reinforced plastic shaft described above, since the weight is lighter, the head speed is increased and the flight distance is extended. The natural frequency does not increase so much, the moment of inertia about the grip end as the center of rotation is large, and the torque does not decrease too much, making it difficult for golfers who used steel shafts to grasp the swing timing. However, there is a problem that many miss shots occur even though it is a club with a large number of balls (short iron) that attaches great importance to directionality and accuracy of flight distance.

The present invention has been made in view of the above circumstances, taking advantage of light weight in a long club with a small iron number, increasing the head speed to increase the flight distance, and in a short club with a large bunt, it is easy to grasp the timing of the swing and it is difficult to make a miss shot. Provide a golf club set using a fiber reinforced plastic shaft that can greatly improve the directionality and accuracy of the flight distance and eliminate the uneconomical fact that the shaft is cut off as the count increases when the club is assembled. The purpose is to do.

[Structure of Invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a golf club set comprising a plurality of golf clubs having different counts using a fiber reinforced plastic shaft, wherein fibers of each golf club are provided. The taper degree of the reinforced plastic shaft is gradually increased from a club with a smaller count to a club with a larger count.

It is desirable that the natural frequencies of the golf clubs be sequentially increased from the club with the smallest count to the club with the largest count.

It is desirable that the shaft torque of each golf club be successively reduced from a club with a smaller count to a club with a larger count.

(Operation) With the above configuration, since the fiber reinforced plastic shaft is used as the shaft of each golf club, the long club with a small count can be reduced in weight, increased in head speed, and increased in flight distance. In addition, since the taper of the fiber reinforced plastic shaft of each golf club was gradually increased from a club with a smaller count to a club with a larger count, the shorter club with a larger count has a larger increment of natural frequency and The amount of decrease in the moment of inertia around the grip end as the center of rotation increases, and the shaft torque also decreases, making it easier to grasp the timing when swinging and less likely to miss shots, improving the accuracy of directionality and flight distance. Come to do.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. The first
The figure shows an example in which full sets are aligned, and they are arranged from the left side in the figure in ascending order of count (long shaft). In other words, 1W in the figure is the 1st wood club called driver, 3W is the 3rd wood club called spoon, and 4W is called buffy 4
No. Wood Club, 3I is No. 3 Iron Club, 4I is No. 4 Iron Club, 5I is No. 5 Iron Club, 6I is No. 6 Iron Club, 7I is No. 7 Iron Club, 8I is No. 8 Iron Club, 9I is No. 9 Iron club, PW is pitching wedge, SW is sand wedge. Shafts 1Wa, 3Wa, 4Wa, 3Ia, 4Ia, 5Ia, 6Ia, 7 of each count club 1W ~ SW
Ia, 8Ia, 9Ia, PWa, SWa are mandrel (core rod) carbon graphite fiber, boron fiber, aramid fiber,
It is a shaft made of fiber reinforced plastic, which is produced by pre-perig sheet winding method or filament winding method in which reinforced fiber sheets such as titanium fibers are wound in multiple layers, and thermosetting plastic is filled and cured.

The fiber reinforced plastic shafts 1Wa to SWa of the clubs 1W to SW of the counts are manufactured by using mandrels (core rods) having different lengths and taper degrees, so that the required length of each count can be obtained in advance. In addition, the taper is gradually increased from the club with the smallest count to the club with the largest count.

For example, the length of the shaft 1Wa of the 1st wood club 1W is 1 inch, the length of the shaft 3Wa of the 3rd wood club 3W is 1-1 inch, and the shaft 4Wa of the 4th wood club 4W.
Has a length of 1-1 / 2 inches. Also, the length of the shaft 3Ia of the 3rd iron club 3I is set to ₁ inch and 4
The length of shaft 4Ia of No. 5 iron club 4I is l ₁ -1/2 inch, and the length of shaft 5Ia of No. 5 iron club 5I is l
And ₁ -1 inch, the 6-iron club 6I shaft 6Ia
The length of the l ₁ -1/2 inch, the length of the shaft Ia of 7-iron club 7I is a l ₁ -2 inches, the length of the shaft 8Ia of 8-iron club 8I l ₁ -2 · ₁ 1/2 inch,
The length of shaft 9Ia of 9th iron club 9I is l ₁ -1.
The length of the shaft PWa of the pitching wedge PW is l ₁ −3 · 1/2 inches, and the length of the shaft SWa of the sand wedge SW is l ₁ −4 inches. Each count shaft 1Wa to SWa with different lengths is tapered from the hand (grip side) to the tip (head root), and each count shaft
The outer diameter A of the hands (grip side) of 1Wa to SWa is the same for all counts, and the outer diameter B of the tip (root portion of the head) is also the same for all counts. Therefore, the taper degrees 1Wa to SWa of the respective counts are gradually increased in taper (the taper degree is stronger) from the smaller count to the larger count (as the shaft length becomes shorter).

In addition, the shafts 1Wa-SWa of the clubs 1W-SW mentioned above are
By increasing the number of high-strength fibers in order from the smaller count to the larger count (as the shaft length becomes shorter), the natural frequency is increased stepwise and the torque is decreased.

Thus, in the golf club set having the above-mentioned configuration, since the fiber reinforced plastic shaft is used as the shafts 1Wa to SWa of the golf clubs 1W to SW of each count, it is possible to reduce the weight of the long club with a small count and to reduce the head. The speed increases and the flight distance can be increased. Also, since the taper degree of each count fiber reinforced plastic shaft 1Wa to SWa was increased in order from a club with a smaller count to a club with a larger count, a short club with a larger count has a larger increment of natural frequency, and Each time the count goes up, the amount of decrease in the moment of inertia centering on the grip end as the center of rotation becomes smaller, and the shaft torque also becomes smaller, making it easier to grasp the timing when swinging and less likely to make miss shots. Will be improved.

In general, a fiber-reinforced plastic shaft is manufactured by winding a reinforcing fiber sheet around a mandrel in multiple layers and filling and hardening thermosetting plastic. Put it in at once and cure. In other words, 90 mandrels are required to manufacture 90 shafts. Conventionally, almost all counts have a common mandrel of the same shape, a fiber sheet is wound and cured with the same structure, and then the mandrel is pulled out and finished to form a shaft, which is adapted to each count at the golf club assembly stage. It is cut into length and used.

By the way, as mentioned above, each golf club shaft 1Wa ~ S
To gradually increase the taper degree of Wa from a club with the smallest count to a club with the largest count, use mandrels (core rods) of different shapes and lengths according to the taper degree of each count. However, the design and manufacturing costs are disadvantageously high in the past, but nowadays with the advancement of CAD (computer design) and numerical control machine tools, it is necessary to use multiple types of mandrels with precise and different shapes. It is low cost, easy to manufacture, and not too painful. On the contrary, the following will bring economic benefits. In other words, since the shaft that has been completed in common has been cut and used at the golf club assembly stage to a length corresponding to each count, carbon graphite fiber, boron fiber, aramid fiber, titanium fiber, etc. are very expensive. Since a large amount of various reinforcing fiber materials are cut off, it is very wasteful, uneconomical and costly. On the other hand, as described above, by manufacturing each shaft with a required length by using a predetermined mandrel, it is possible to reduce the waste of the material such as the reinforcing fiber and reduce the cost.

Also, when using the shaft completed like the conventional one by cutting the hand side sequentially according to each count at the golf club assembly stage,
Even if the shaft has the same outer diameter on the head attachment side, the outer diameter on the hand side becomes thinner as the count increases, and the grip becomes too thin, making it easier for the head to return when swinging and hooking the ball to the left. There is a problem that it will occur, and since the proximal side of the shaft is cut, the required natural frequency did not increase, and the torque hardly decreased, but such a problem can be solved satisfactorily by the configuration described above. become.

Each of the count shafts 1Wa to SWa in the above embodiment has a taper portion between the grip lower end at the hand and the root upper end of the head as shown in the figure, and the upper and lower portions thereof are for grip mounting and head hosel mounting. Although the parallel portion has no taper, it may have a configuration in which the entire length of the upper and lower ends is tapered.

〔The invention's effect〕

Since the present invention is configured as described above, it is possible to take advantage of light weight in a long club with a small iron number, increase the head speed to increase the flight distance, and to easily catch the swing timing in a short club with a large iron number, resulting in a miss shot. A golf club set using a fiber reinforced plastic shaft that is difficult to improve the directionality and accuracy of the flight distance, and can eliminate the uneconomical fact that the shaft is cut off longer as the count increases when assembling the club. can get.

[Brief description of drawings]

FIG. 1 is a front view of a golf club of a full set number showing an embodiment of the present invention. 1W-SW …… Golf club, 1Wa-SWa …… Shaft.

Claims (3)

[Claims] 1. A golf club set comprising a plurality of golf clubs using fiber reinforced plastic shafts of different counts, wherein the taper degree of the fiber reinforced plastic shafts of each golf club is changed from a club with a smaller count to a club with a higher count. A golf club set characterized by increasing in size as it gets bigger. 2. The golf club set according to claim 1, wherein the natural frequencies of the golf clubs are sequentially increased from a club with a smaller count to a club with a larger count. 3. The golf club set according to claim 1, wherein the torque of the shaft of each golf club is gradually reduced from a club with a smaller count to a club with a larger count.