JPH02224679A - Golf club set - Google Patents

Abstract

PURPOSE:To make a long club having a small number light-weight and to reduce the twist degree of the shaft itself of a short club having a big number by successively making the outer diameters of fiber reinforced plastic shafts of respective golf clubs thick as it goes from the club having the small number to the club having the big number. CONSTITUTION:The outer diameters of fiber reinforced plastic shafts 3a-10a of respective golf clubs 3-10 are successively made thick as it goes from the club having the small number to the club having the big number. Thus, the twist degrees per shaft unit length are successively made small, and in the case of the long club having the small number, the light weight is executed, a head speed is increased, and a carrying distance can be made long. In the case of the short club having the big number, the twist degree of the shaft itself is made as small as a steel shaft, the head is quickly turned at the time of a swing, a miss shot to hook the ball to the left is made unfrequent, and the directivity of a hit ball can be 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) Golf clubs generally come in various types, including 1, 3, and 4 wood clubs such as drivers, spoons, and buffies, 3 to 9 iron clubs, pitching clubs, and sand wedges. A golf club set is made up of a number of clubs with different club counts.

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 shaft 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 shafts made of steel and shafts made of fiber-reinforced plastic such as carbon, but the former steel shaft is heavy and does not increase head speed and distance, so the latter shaft is lightweight and is made of fiber-reinforced plastic. More and more people are using clubs that use shafts.

(Problem 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 shorter the club (shorter iron), the more likely the head will turn when you swing, causing the ball to end up hooked to the left.

The reason for this is that first, larger clubs have shorter shafts and a smaller moment of inertia around the grip end, so the head will return faster in a straight turn similar to a long iron, and the longer the club is used, the shorter the iron. As the lie angle increases, the distance from the extension of the shaft axis to the head's center of gravity increases, and the weight of the head itself increases, so the moment of rotation around the shaft axis is large, and if it is a steel shaft. The torsion of the shaft itself is low and can offset the rotational moment, but in the case of fiber-reinforced plastic shafts, the torsion of the shaft itself is 2.5 to 4 times that of steel shafts, making it impossible to suppress the rotational moment. , the head returns too early and the ball gets hooked to the left.

The present invention was developed in view of the above circumstances, and aims to reduce the weight of a long club with a small number so that the head speed increases and the flight distance is increased, and with a short club with a large number, the torsion of the shaft itself is reduced to the same degree as a steel shaft. To provide a golf club set using a fiber-reinforced plastic shaft which is very easy to use and can reduce the possibility of the head returning quickly during swing and catching the ball to the left.

[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 outer diameter of the reinforced plastic shaft is
The club is characterized by being gradually thicker from a small club to a club with a large club count.

The fiber-reinforced plastic shaft of each golf club is characterized in that the degree of torsion per unit length is gradually decreased from a club with a small club count to a club with a large club count.

(Function) A fiber-reinforced plastic shaft is used as the shaft of each golf club, and the outer diameter of the fiber-reinforced plastic shaft is gradually increased from a small club to a large club. By gradually reducing the twist per length, long clubs with a small number can be made lighter, increasing head speed and distance, while short clubs with a larger number can reduce the twist of the shaft itself. The shaft is as small as a steel shaft, so the head returns quickly during the swing and is less likely to hook the ball to the left, improving the direction of the ball.

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

Note that an iron golf club set is illustrated here.

First of all, the first figure is a front view of each club arranged in order, and the second figure is a front view of each club arranged in order.
The figure is a cross-sectional view of the length L from the hosel (base of the head) of the shaft of each club in Figure 1. From the left side of the figure, numeral 3 is a No. 3 iron club, 4 is a No. 4 iron club, and 5 is a No. 4 iron club. is a 5-iron club, 6 is a 6-iron club, 7 is a 7-iron club, 8 is an 8-iron club, 9 is a 9-iron club, and 10 is a sand wedge. Shafts of these clubs 3 to 10 of each number) 3a,
4a, 5a, 6a, 7g, 8a19a.

Each shaft 10a is made of fiber-reinforced plastic manufactured by a filament winding method.

Moreover, since the shafts 3a to 10a of each number are manufactured using the same mandrel, the inner diameter of all the numbers is the same, but the outer diameter is gradually increased from the smaller club to the larger club. There is. In other words, the fiber-reinforced plastic shafts 3a to 10a of the golf clubs 3 to 10 of each number are thickened and the outer diameter is increased by increasing the number of times the fibers are wound from the smaller club to the larger club. The shaft is made thicker, and the degree of twist per unit length of the shaft is gradually decreased from smaller clubs to larger clubs.

Further, in the fiber-reinforced plastic shafts 3a to 10a of the golf clubs 3 to 10 of each number, the winding angle of the fibers in the axial direction of the shaft is gradually increased from the smaller number club to the larger number club, and the shaft unit length is The degree of torsion at hit is gradually reduced from a club with a small club count to a club with a large club count.

Therefore, in the golf club set having the above-described configuration, fiber-reinforced plastic shafts are used as the shafts 3a to 10a of each golf club 3 to 1o, as described above;
Moreover, the fiber reinforced plastic shafts 3a to 10a
By gradually increasing the outside diameter of the club from a small club to a club with a large club count, the torsion degree per unit length of the shaft is gradually reduced, making it possible to reduce the weight of long clubs with a small club count. At the same time, with short clubs with large clubs, the torsion of the shaft itself is reduced to the same level as that of steel shafts, making it easier to make mistakes where the head returns too quickly during the swing and hooks the ball to the left. The number of shots will be reduced, the direction of the ball will be improved, and approach shots will be more accurate.

〔Effect of the invention〕

Since the present invention is configured as described above, a long club with a small club count can be made lighter, the head speed can be increased, and flight distance can be extended, and a short club with a large club count can have a torsion degree of the shaft itself that is similar to that of a steel shaft. To obtain a golf club set using a fiber-reinforced plastic shaft that is small and very easy to use, which can reduce the possibility of the head returning early during swing and catching the ball to the left.

[Brief explanation of the drawing]

FIG. 1 is a front view of a club of each size of an iron set club showing an embodiment of the present invention, and FIG. 2 is a sectional view of the shaft of a club of each size along line 1--2 of FIG. 3-10...Golf club, 3a-10a...Shaft.

Claims (2)

[Claims] (1) In a golf club set consisting of a plurality of golf clubs with different counts using fiber-reinforced plastic shafts, the outer diameter 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 largest count. A golf club set that is characterized by gradually increasing the thickness. (2) The golf club set according to claim 1, wherein the degree of torsion per unit length of the fiber-reinforced plastic shaft of each golf club is gradually decreased from a small club to a large club.