JPH0639037U - Golf club shaft - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a non-metallic shaft of a golf club that can be easily attached to a head for a steel shaft. [Constitution] Metal fibers were wound around the tip side of the non-metal shaft.

Description

[Detailed description of the device]

[001]

[Industrial applications]

 The present invention relates to a non-metallic shaft for a golf club, in which the tip side is heavy and a steel shaft head can be attached.

[002]

[Prior art]

 The center of gravity of the steel shaft of the golf club and the non-metallic shaft made of carbon fiber or its main material and other fibers (for example, aramid fiber, boron fiber, glass fiber, etc.) wrapped around it are on the near side. Therefore, it is necessary to change the weight of the attached head to a heavier value, and in the former case where the center of gravity is on the tip side, the one that is several grams lighter than the latter is installed. For this reason, manufacturers that manufacture golf clubs with both shafts must always stock two types of heads depending on the type of shaft.

However, keeping the two types of heads in stock always requires a large amount of cost in manufacturing and managing the mold, manufacturing the head, and stocking the heads. Therefore, it has been conventionally attempted to adjust the centers of gravity of non-metallic shafts and steel shafts and attach both shafts to one type of head.

When attaching a dissimilar shaft to this one kind of head, in the case of attaching a non-metal shaft to a head for a steel shaft, as shown in FIG. 5, a metal weight 2 such as plug-like lead or brass is attached. Insert it into the tip side core hole of the non-metal shaft 1, or insert the plug 3 into the tip side part of the core hole as shown in FIG. 6, and seal the tip side of the plug 3 with metal powder 4 such as lead powder. Then, the tip side was made heavy, and it was inserted into the hosel of the head 5 for a steel shaft. On the contrary, when the steel shaft is attached to the non-metal shaft head, the metal weight 2 such as plug-like lead or brass is inserted into the butt side of the steel shaft 6 or a metal plate such as a lead plate is used inside. I put it on and made the bat side heavy.

[0095]

[Problems to be solved by the device]

 However, the work of attaching the metal weight 2 or the metal plate or enclosing the metal powder 4 was very complicated. In particular, the method of enclosing the metal powder 4 causes noise during the swing, and the mounting of the metal plate causes the stress to be concentrated on the portion depending on the mounting position, resulting in breakage. It was a thing.

[0096]

[Means for Solving the Problems]

 The present invention provides a non-metallic shaft for a golf club that solves the above problems. That is, in the present invention, the metal fiber is wound around the tip side of the non-metal shaft.

[0097]

[Action]

 When a metal fiber is wound around the tip side of a non-metal shaft, the center of gravity moves to the tip side at the time of manufacturing the shaft, so the head for a steel shaft can be mounted immediately, eliminating the work of adjusting the center of gravity. Become. In addition, since the metal fiber is integrated with the shaft, noise and stress concentration do not occur during swinging and hitting.

As the metal fibers, those having large specific gravity and strength, for example, those shown in Table 1 are preferable. To wrap the metal fiber inside the tip side wall of the shaft, create a composite prepreg in which the metal fiber is sandwiched between two prepregs and laminated with a synthetic resin (for example, epoxy resin). It may be wound around the tip side of the cored bar. The two prepregs sandwiching the metal fiber may be the same or different prepregs. The prepreg may be an inorganic fiber such as carbon fiber, boron fiber or glass fiber, or a synthetic fiber prepreg such as aramid fiber.

[0109]

[Table 1]

When the metal fiber is wound, the inner layer of the shaft is less affected by the rigidity of the metal fiber, so that the characteristics of the non-metal shaft are not lost and only the weight is added. Therefore, it is preferable to wind the metal fiber in the inner layer. , It is preferable that the winding end on the tip side is gradually thinned toward the bat side so that the weight of the shaft does not change suddenly. It is preferable that the length of the rolled-in portion is in the range of 50 to 350 mm from the tip and the weight is adjusted to 3 to 15 grams. Further, it is preferable that the direction of the fibers is parallel to the axis of the shaft.

[0111]

【Example】

 1 to 4 show an embodiment of the non-metallic shaft of the present invention, FIG. 1 is a longitudinal sectional view, and FIG. 2 is a transverse sectional view taken along the line AA of FIG. In these figures, 7 is an inner layer of metal fibers, 8 is an intermediate layer of carbon fibers, 9 is an outer layer of carbon fibers, and the inner layer 7 of metal fibers is a tungsten fiber 10 as shown in FIG. (Outer diameter 100 μm, pitch 0.9 mm) Both sides of thin carbon fiber prepreg 11 and glass fiber prepreg 12 are laminated with epoxy resin, and a composite prepreg 13 is cut into a sail shape as shown in FIG. It was rolled up and had a uniform thickness up to 150 mm from the tip end, but gradually became thinner from there to the bat side.

As shown in FIGS. 4 (B) and 4 (C), the carbon fiber intermediate layer 8 is formed by alternately arranging carbon fiber prepregs 11 in which the carbon fibers are oriented at 25 to 45 degrees in the opposite direction to the axis. It is wound to prevent the shaft from twisting. As shown in FIG. 4D, the outer layer 9 of carbon fibers is formed by winding a carbon fiber prepreg 11 in which carbon fibers are oriented in the axial direction to adjust hardness and maintain strength. is there.

[0113]

[Effect of device]

 As described above, since the non-metal shaft of the present invention does not require the position adjustment of the center of gravity, it can be immediately attached to the head for the steel shaft, and the head for the steel shaft only can be stocked. Since it is sufficient, the manufacturing cost can be reduced.

[Brief description of drawings]

1 is a longitudinal sectional view of an embodiment of a golf club shaft according to the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of an example of a composite prepreg used for winding metal fibers.

FIG. 4 is a view showing a prepreg winding sequence of a golf club shaft according to an embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a conventional center-of-gravity position adjusting method when a non-metal shaft is attached to a head for a steel shaft.

FIG. 6 is an exploded perspective view showing another conventional method of adjusting the position of the center of gravity when a non-metallic shaft is attached to a head for a steel shaft.

FIG. 7 is an exploded perspective view showing a conventional center-of-gravity position adjusting method when a steel shaft is attached to a non-metal shaft head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Non-metal shaft, 2 ... Metal weight, 3 ... Plug, 4 ... Metal powder, 5 ... Steel shaft head, 6 ... Steel shaft, 7 ... Metal fiber entrainment inner layer, 8 ... Carbon fiber intermediate layer, 9 ... Outer layer of carbon fiber, 10 ... Tungsten fiber,
11 ... Carbon fiber prepreg, 12 ... Glass fiber prepreg, 13 ... Composite prepreg,

Claims (1)

[Scope of utility model registration request] 1. A shaft of a golf club, wherein a metal fiber is wound around the tip side of a non-metal shaft.