JPH057005Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a golf club set whose shaft portion is made of fiber-reinforced plastic and has a plurality of interconnected golf clubs.

BACKGROUND TECHNOLOGY Metal pipes have traditionally been widely used as shafts for golf clubs, and the shafts are provided with knot-like stepped portions (generally called steps), and the number of steps and steps in the length direction of the shaft are varied. The position of the tight point was adjusted by changing the position of.

Furthermore, by using carbon fiber reinforced plastics instead of metal, the weight of the shaft was reduced, and in addition, it became possible to set the rigidity as desired. In particular, as disclosed in Japanese Utility Model Application No. 55-131275, the distance between the two adjustment sheets can be varied on both sides of the tip side (head insertion side) and butt side (grip insertion side) of the shaft. It is known that the position of the kick point can be arbitrarily changed by arranging the golf club in such a manner that the entire set of golf clubs can be set to be at hand or at first. Furthermore, when conventionally manufacturing golf clubs, it is necessary to use the shaft of the longest iron club and wood club in the set as the reference shaft, and to shorten the reference shaft as the club size increases. In this case, the shaft was cut from the tip side. Therefore, the mounting position of the tight point adjustment sheet is the same for the shafts in the set, and as the count increases within the set, the tight point moves toward the tip. As the number increases, the condition of the shaft moves from the hand to the tip. As a result, a long club with a small number in the set tends to be difficult to swing, making it difficult to swing and hit the ball high, while a short club with a large number tends to lead the ball forward, resulting in a poor direction of the ball.

Problems to be Solved by the Invention In view of these conventional drawbacks, the present invention aims to improve the ball hitting direction with a short club with a large club count, while a long club with a small club count makes it easier to hit the ball and has excellent feel. It was made for the purpose of supplying sets of golf clubs.

Means for Solving the Problems The present invention is a set of multiple golf clubs, in which the shaft of each club is made of fiber-reinforced plastic, and the shaft is formed by winding and laminating fiber-reinforced plastic sheets around a mandrel. When doing so, a tight point adjustment member made of a fiber reinforced plastic sheet is layered and wound over the tip side end of the shaft, and the length of the tight point adjustment member from the end where the head is attached is determined by the thread count. The iron club is characterized by a constant or sequential length increasing from a long club with a small number to a short club with a large number.To explain in detail based on an example of a set of iron clubs, the iron club is made of fiber reinforced iron as shown in Figure 1. In a set of golf clubs using a shaft 1 made of plastic, when winding and stacking the tight point adjusting member 9 shown in FIGS. 4 to 6, the length of the tight point adjusting member 9 is Regardless of the size of the thread count, the length is constant from the end where the head is attached, or it is gradually lengthened as the thread size increases.

As described above, in the present invention, the length of the stiff point adjustment member from the head attachment end is increased uniformly or sequentially from a long club with a small club count to a short club with a large club count, thereby adjusting the shaft. The position of the kick point relative to the entire length of the grip remains constant or gradually approaches the grip side.

Taking the set of an iron club as an example and explaining it based on the drawings, FIG. 2 shows a shaft 1 of the present invention that supports the end of the tip side 2 and applies a load 5 from the end of the butt side 3 in the direction of the reference line 4. This shows a state in which the shaft is curved by adding it, and the kick point 6 can move toward the butt side 3 as the shaft length becomes shorter. It should be noted that the reason why the kick point 6 is bent in the figure is because the bending of the shaft 1 is modeled, and only the most curved state is shown.

Example Examples will be described below based on the drawings.

When manufacturing a golf club shaft 1 made of fiber-reinforced plastics, as shown in FIG.
7' and 8 are cut, and when the shaft is formed by winding and laminating them on a mandrel, cut the tight point adjustment member 9 made of a unidirectional alignment sheet and overlap it on the tip side end of the shaft. The material is formed by winding it around a mandrel and curing it. At this time, the tight point adjustment member 9 that is wound and laminated is used when the club has a large number and a short length, as shown in FIGS. 4 to 6. As it grows, wrap it in longer lengths. Then, by using the longest shaft in the set of golf clubs as the reference shaft and cutting the shafts shorter as the club club size increases, the length of the stiff point adjustment member 9 from the head attachment end will remain constant during the set. Or it gets longer. When manufacturing the shaft, it becomes possible to use the straight sheet 8 and the bias sheets 7, 7' in common, thereby improving productivity.
In addition, by matching the amount of change in the length of the tight point adjusting member 9 between the numbers to the cutting dimension on the tip side of the shaft, the length of the tight point adjusting member 9 can be kept constant when viewed from the golf club set. It is also possible to Furthermore, by arbitrarily setting the length of the adjustment member as the number of the adjustment member increases, such as 30 mm or 50 mm, it is possible to obtain a shaft that can accommodate various types of golfers. It will be done.

In addition, as shown in FIG. 5, by not making the cutting surface 10 on the butt side parallel to the tip side, uneven thickness during shaft molding can be prevented, and furthermore, as shown in FIG. 6, a notch 11 can be provided. In addition to preventing uneven thickness, this has the advantage that the shaft curves smoothly.

Although the description has been made with respect to a set of iron clubs, the present invention can also be implemented with a set of wood clubs.

Effects As described above, in this invention, as the number of clubs in a set of golf clubs increases, the kick point gradually approaches the grip side, and long clubs with small numbers move closer to the tip side, so long clubs also You will be able to hit the ball more easily, and the ball will go higher and farther. A short club with a large number allows the ball to be hit accurately in the direction and distance, and has the effect of contributing to a golfer's score increase.

In addition, with a shaft that is pitch-adjusted, the vibration of the shaft caused by the impact is less likely to be transmitted to the hands, so even if you make a mis-shot, the unpleasant sensation is less likely to be transmitted to the hands, allowing you to swing the club comfortably. This is especially true for most golfers who are not good with long irons. In addition, when adjusting the tight point in a conventionally known steel shaft, it is done by providing a step and changing the shaft diameter or wall thickness to change the moment of inertia of the area. There will be some weak points. On the other hand, in order to adjust the tight point while maintaining sufficient strength, the weight of the shaft inevitably increases, which limits the degree of freedom in design. In this case, the shaft weight of the present invention can be designed to be small, and the reinforcing fibers can be changed in various ways, so it is possible to adjust the tight point without creating weak parts, increasing the degree of freedom in design. is also significantly improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a shaft related to the setting of the golf club of the present invention, Fig. 2 is an explanatory view showing the operation of one embodiment of the invention, and Fig. 3 is a cut state of a sheet for manufacturing the shaft. Front view showing 4th
6 through 6 are front views showing various cutting examples of the tight point adjusting member according to the present invention. 1...Shaft, 1a-1h...Shaft, 2
...Tip side, 3...Butt side, 4...Reference line,
5...Load, 6...Kick point, 7,7'...
...Bias sheet, 8...Straight sheet, 9
... Kick point adjustment member, 10 ... Cutting diagram of butt side, 11 ... Notch.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a set of multiple golf clubs, the shaft of each club is made of fiber-reinforced plastic, and when the shaft is formed by winding and laminating fiber-reinforced plastic sheets around a mandrel. A tight point adjusting member made of a fiber reinforced plastic sheet is layered and wound over the tip side end of the shaft, and the length of the tight point adjusting member from the head attachment end is a long one with a small count. A set of golf clubs having shafts made of fiber-reinforced plastics, characterized in that the shafts are lengthened uniformly or sequentially as the clubs become shorter and larger in number. 2. The golf club set as claimed in claim 1, wherein the length increment from the head attachment end of the shaft kick point adjustment member is constant depending on the number of clubs.