JPH02224771A - Golf club set - Google Patents

Abstract

PURPOSE:To increase the flight distance of a long club and make a short club easy to grasp the swing timing by increasing the tapering of fiber-reinforced plastic shafts of golf clubs in sequence from the club with a smaller club number to the club with a larger club number. CONSTITUTION:Fiber-reinforced plastic shafts 1Wa-SWa of clubs 1W-SW are manufactured with mandrels different in length and tapering, each club has the length required for the club number, and the tapering is increased from the club with a smaller club number to the club with a larger club number in sequence. The long club with a small club number is made lightweight, the head speed is increased, and the flight distance can be extended. The tapering of a shaft is increased for the club with a larger club number, thus the augmentation of the natural frequency is increased, the reduction of the inertial moment using a grip end as a rotary center is decreased, the torque of the shaft is decreased, the swing timing is easily grasped, a miss shot rarely occurs, and the precision of the directivity and flight distance is improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a golf club set comprising a plurality of golf clubs of different counts each using a fiber-reinforced plastic shaft. This invention relates to a golf club set with an improved shaft.

(Prior Art) Generally, golf clubs include various types such as 1 and 3.4 wood clubs such as drivers, spoons, and buffies, 3 to 9 iron clubs, pitching clubs, and sand wedges. A golf club set is a suitably arranged set of multiple clubs with different characteristics.

Smaller clubs such as wood clubs such as drivers and long irons have longer shafts and smaller loft angles on the face of the head, resulting in lower trajectories and longer distances. Conversely, the larger the club (short iron), the shorter the set and the larger the loft angle of the face of the head, resulting in a higher trajectory and shorter flight distance. Taking advantage of the characteristics of each club size, golfers use different clubs depending on the situation.

The shaft of each club in this golf club set is
There are those made of steel and those made of fiber-reinforced plastic such as carbon. The former steel shaft is heavy, so the longer the club, the greater the moment of inertia around the grip end, which prevents head speed from increasing and flight distance from increasing. On the other hand, clubs with shafts made of fiber-reinforced plastic are lightweight, have a small moment of inertia around the grip end even if they are long, and can increase club head speed and distance, so many people use them. are becoming more common.

(Problems to be Solved by the Invention) By the way, golf clubs using the above-mentioned fiber-reinforced plastic shafts are lightweight, which increases head speed and distance. The natural frequency does not increase much, the moment of inertia decreases largely around the grip end as the center of rotation, and the torque does not decrease too much.
Golfers who used to use steel shafts had trouble grasping the timing of their swings, and even though they were playing clubs with large club counts (short irons) that placed importance on direction and distance accuracy, they were prone to many missed shots. there were.

The present invention was developed in view of the above circumstances, and a long club with a small club count takes advantage of its light weight to increase head speed and distance, while a short club with a large club count makes it easier to grasp the timing of the swing, making it difficult to make missed shots. To provide a golf club set using a fiber-reinforced plastic shaft that can significantly improve the accuracy of directionality and flight distance, and also eliminate the uneconomical process of cutting off the shaft as the number increases when assembling the club. The purpose is to

[Structure of the 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 of different counts each using a fiber-reinforced plastic shaft. The reinforced plastic shaft is characterized in that the degree of taper is gradually increased from a club with a small club count to a club with a large club count.

It is desirable that the natural frequency of each golf club be increased in order from a club with a small club count to a club with a large club count.

It is desirable that the torque of the shaft of each golf club be reduced in order from a club with a small club count to a club with a large club count.

(Function) With the above configuration, since a fiber-reinforced plastic shaft is used as the shaft of each golf club, the weight of a long club with a small number can be reduced, the head speed can be increased, and the flight distance can be increased. In addition, the degree of taper of the fiber-reinforced plastic shaft of each golf club was gradually increased from a small club to a large club, so short clubs with a large club have a large increase in natural frequency and The decrease in the moment of inertia around the grip end as the center of rotation becomes smaller as the grip increases, and the torque of the shaft is further reduced, making it easier to grasp the timing of the swing and less likely to miss a shot, improving the accuracy of direction and distance. You will start to improve.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

Note that FIG. 1 shows an example of a complete set, arranged in descending order of count (long shaft) from the left side of the figure. In other words, IW in the diagram is the No. 1 wood club called the driver, and 3W
is a No. 3 wood club called a spoon, 4W is a No. 4 wood club called a buffy, No. 3 iron club is a No. 3 iron club, No. 4 is a No. 4 iron club, No. 51 is a No. 5 iron club, and No. 6I is a No. 6 iron club. Iron club, 7! is a 7-iron club, 8■ is an 8-iron club, 9I is a 9-iron club, PW is a pitching wedge, and SW is a sand wedge. The shafts lWa and 3Wa of these clubs 1w to 5w of each number.

4Wa, 31a, 4Ia, 51a, 6Ia.

71 a, 8 I a, 91 a, PWa, SWa are
Carbon graphite fiber on the mandrel (core rod).

Fibers manufactured by the Briperig sheet winding method or the filament winding method, which are manufactured by winding reinforcing fiber sheets such as boron fibers, aramid fibers, titanium fibers, etc. in multiple layers and filling and curing them with thermosetting plastic. Shaft made of reinforced plastic.

Here, the fiber-reinforced plastic shafts IWa = SWa of the club IW-8W of each number mentioned above are manufactured using mandrels (core rods) with different lengths and taper degrees, so that each club has its own shape in advance. The required length of the club count and the degree of taper are gradually increased from a club with a small club count to a club with a large club count.

For example, the length of the shaft I W a of the No. 1 wood club IW is 1 inch, and the length of the shaft I W a of the No. 3 wood club 3W is 1 inch.
The length of Wa is I-1 inches, and the length of the shaft 4 Wa of No. 4 wood club 4W is g-1·1I2 inches. Further, the length of the shaft 31a of the No. 3 iron club 31 is 10 inches, and the length of the shaft 31a of the No. 3 iron club 31 is 10 inches.
The length of the shaft 41g of No. 1 is 1lt-1I2 inches, and the length of the shaft 51a of No. 5 iron club 5 is f.
The length of the shaft 6Ia of the No. 6 iron club 6 is 11-1 l/2 inches, the length of the shaft 7Ia of the No. 7 iron club 71 is gl-2 inches, and the length of the shaft 6Ia of the No. 6 iron club 6 is gl-2 inches. The length of the shaft 81a of club 8■ is 11-2.1I2 inches, and the number 9 iron club 9! The length of the shaft 91a is j! The length of the shaft P W a of the pitching wedge PW is fi, -3-172 inches, and the length of the shaft S W a of the sand wedge SW is 11-4 inches. Shafts of different sizes I W
a~S W a is tapered from the hand (side of the grip) to the tip (base of the head), and each shaft number I W a~S W
The outer diameter A of the hand (grip side) of a is the same for each count, and the outer diameter B of the tip (base of the head) is also the same for each count. Therefore, the shaft I W a = S W a of each number has a tapered degree (the degree of taper becomes stronger) in order from a smaller number to a larger number (as the shaft length becomes shorter).

Also, the shaft IW of each club IW-8W mentioned above
a = SW a gradually increases the natural frequency by gradually increasing the natural frequency by blending more high-strength fibers from small to large counts (as the shaft length becomes shorter), and at the same time, the torque is reduced. are doing.

Therefore, in the golf club set having the above-mentioned configuration, the shafts IW a -S of the golf clubs IW-3W of each number are
Since a fiber-reinforced plastic shaft is used as the W a, a long club with a small club count can be made lighter, and head speed can be increased to increase flight distance. In addition, since the taper degree of the fiber-reinforced plastic shafts IWa-SWa of each number was gradually increased from a small club to a club with a large number, short clubs with a large number were
The increase in the natural frequency is large, and as the number increases, the decrease in the moment of inertia around the grip end becomes smaller, and the torque of the shaft becomes smaller, making it easier to grasp the timing when swinging and miss shots. This will improve the accuracy of directionality and flight distance.

Generally, fiber-reinforced plastic shafts are manufactured by wrapping reinforcing fiber sheets around a mandrel in multiple layers and filling and curing the thermosetting plastic. Place the book in one place and let it harden. In other words, 90 mandrels are required to manufacture 90 shafts. In the past, a fiber sheet with the same configuration was wrapped around a mandrel of the same shape that was common to almost all golf clubs, and after curing, the mandrel was pulled out and finished to complete the shaft, which was then assembled according to each golf club count at the golf club assembly stage. It is used by cutting it to the desired length.

By the way, as mentioned above, the shaft IW of each golf club
Increasing the taper degree of a to S W a from a small club to a club with a large club count means that mandrels (center rods) of different shapes and lengths are used depending on the taper degree of each club. In the past, the design and production costs were high, which was disadvantageous, but today, as CAD (computer design) and numerically controlled machine tools have become more sophisticated and widespread, multiple precise and different shapes can be used. Seed mandrels can be easily produced at low cost and are not too difficult. On the contrary, the following economic effects can be obtained. In other words, in the past, a standardized completed shaft was cut into lengths according to each count at the golf club assembly stage, so carbon graphite fibers, boron fibers, aramid fibers, titanium fibers, etc. Since a large amount of reinforcing fiber material is cut away, there is a lot of waste and is uneconomical, leading to high costs. On the other hand, as described above, by manufacturing shafts of the required length using a predetermined mandrel for each count, there is less waste of materials such as reinforcing fibers, and costs can be reduced.

In addition, if you use a completed shaft as in the past by cutting the proximal end according to each count at the golf club assembly stage,
Even though the outer diameter of the shaft on the side where the head attaches is the same, the outer diameter on the hand side becomes thinner as the number increases, and the thickness of the grip becomes too thin, making it easier for the head to turn when swinging and pulling the ball to the left. There was the problem of overlapping the shaft, and since the proximal side of the shaft was cut, there was no increase in the required natural frequency, and there was almost no decrease in torque, but these problems can be solved conveniently with the above-mentioned configuration. It becomes like this.

In addition, the shafts I W a to S of each number in the above embodiments
As shown in the figure, W a has a tapered part between the lower end of the grip at hand and the upper end of the base of the head, and the upper and lower parts are parallel parts without a taper for attaching the grip and the head hosel part, but each It is also possible to have a tapered structure over the entire length of the upper and lower ends.

〔Effect of the invention〕

Since the present invention is constructed as described above, long clubs with a small number can take advantage of their light weight to increase head speed and distance, while short clubs with a large number can easily grasp the timing of the swing and make mistakes. Golf that uses a fiber-reinforced plastic shaft that makes it difficult to hit shots, greatly improves directionality and distance accuracy, and also eliminates the uneconomical process of cutting the shaft longer as the club count increases when assembling the club. Get a club set.

[Brief explanation of the drawing]

FIG. 1 is a front view of a full set of golf clubs of each number, showing an embodiment of the present invention. IW~SW...Golf club, IWa~SW a・
··shaft.

Claims (3)

[Claims] (1) In a golf club set consisting of a plurality of golf clubs with different counts using fiber-reinforced plastic shafts, the degree of taper of the fiber-reinforced plastic shaft of each golf club is determined from the club with the smallest club count to the club with the highest count. A golf club set characterized in that the size of the golf club is gradually increased as the size increases. (2) The golf club set according to claim 1, wherein the natural frequency of each golf club is increased in order from a club with a small club count to a club with a large club count. (3) The golf club set according to claim 1, wherein the torque of the shaft of each golf club is gradually decreased from a small club to a large club.