JPH0620548Y2 - Golf Club Shaft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement of a golf club shaft called a carbon shaft.

[Conventional technology]

In recent years, general golf players have come to frequently use carbon shafts because they are superior in lightness, elasticity, and strength to steel shafts.

This carbon shaft is formed by winding a prepreg sheet in which carbon fibers are impregnated with a thermosetting synthetic resin.

[Problems to be solved by the invention]

However, steel shafts are very popular, especially for advanced players. It is said that the reason is that the carbon shaft is inferior in shot feeling to the steel shaft. Specifically, compared to steel shafts, carbon shafts have a faster vibration damping from the impact of hitting the ball, so it is hard to feel the nice shot hitting the sweet spot, and conversely, it falls off the sweet spot. This is because when hit, it does not feel like a steel shaft.

In addition, as an attempt to improve the strength of the carbon shaft,
There is a metal-coated carbon fiber continuous filament group impregnated with a thermosetting synthetic resin and formed into a tube by a filament winding method (JP-A-60-53165).

However, in this carbon shaft, since each metal-coated carbon fiber is wound around the shaft circumferential surface in a spiral shape, the ball impact vibration is not transmitted linearly in the longitudinal direction of the shaft but is transmitted in a spiral shape. In addition, since the structure does not increase the rigidity in the axial direction of the shaft, the impact on the hand due to the impact is dull.

[Purpose of device]

The present invention has been made to solve such conventional problems, and an object thereof is to improve the feel at impact without impairing the features of the carbon shaft such as being lightweight, rich in elasticity, and having strength. It is to provide a golf club shaft that can.

[Means for solving problems]

The golf club shaft according to the present invention has a tubular body formed by winding a prepreg sheet in which carbon fibers are impregnated with a thermosetting synthetic resin, and the metal-coated carbon fibers aligned in one direction are heat-treated. A prepreg sheet impregnated with a curable synthetic resin is provided with an outer layer coated with the metal-coated carbon fibers aligned with the axis direction of the shaft.

[Function of device]

According to the present invention, an outer layer made of a prepreg sheet obtained by impregnating metal-coated carbon fibers aligned in one direction with a thermosetting synthetic resin has a metal-coated carbon fiber aligned with the shaft axial direction. Since it is formed by being formed, the vibration damping is delayed, and the ball impact vibration is linearly transmitted in the longitudinal direction of the shaft.

[Example of device]

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a golf club shaft according to the present invention. In the drawing, 1 is a golf club shaft, and an outer layer 2 of the golf club shaft 1 is a metal coating aligned in one direction. It is composed of a prepreg sheet in which carbon fiber is impregnated with a thermosetting synthetic resin.

As shown in FIG. 2, the tubular body 3 covered by the outer layer 2 is formed by winding three prepreg sheets in which carbon fibers are impregnated with a thermosetting synthetic resin.

The golf club shaft 1 thus constructed is manufactured by a seat rolling method as shown in FIG. 3, for example.

That is, first, a prepreg sheet 5 obtained by impregnating a mandrel 4 with carbon fibers having a fiber diameter of about 7 to 8 μm in an angle direction of 45 ° in the upper right direction and impregnating a thermosetting synthetic resin (epoxy resin in this example) with 2.5 2.5 plies of prepreg sheet 6 wound with ply and impregnated with thermosetting synthetic resin (epoxy resin in this example) by aligning carbon fibers having a fiber diameter of about 7 to 8 μm in the upper left angle of 45 °. Winding around
Further, by wrapping 4.5 plies of the prepreg sheet 7 in which carbon fibers having a fiber diameter of about 7 to 8 μm are aligned in the axial direction of the shaft and impregnated with a thermosetting synthetic resin (epoxy resin in this example), The tubular body 3 has a shape similar to that of the carbon shaft. Next, on this tubular body 3, carbon fiber is coated with nickel, chromium or the like in an amount of about 0.1 to 0.7 μm.
Fiber diameter of about 7 to 8 μm coated (metal plated) with a thickness of m
The metal-coated carbon fibers are aligned in one direction, and the prepreg sheet 8 impregnated with the thermosetting synthetic resin (epoxy resin in this example) is aligned with the shaft-axial direction of the metal-coated carbon fibers. To cover.

As shown in FIG. 4, the vibration damping (FIG. 4 (b)) of the golf club shaft 1 thus manufactured approaches that of the steel shaft (FIG. 4 (a)), and the vibration of the carbon shaft is reduced. It became slower than the decay (Fig. 4 (c)).

That is, the golf club shaft 1 according to the present embodiment can slow the vibration damping as compared with the conventional carbon shaft, has a feeling close to the hitting feeling of a steel shaft, and clearly feels a nice shot or a miss shot.

Further, according to the present embodiment, the metal-coated carbon fibers are linearly and continuously provided from the head insertion portion to the grip portion of the golf club shaft in the axial direction of the shaft. However, the rigidity in the axial direction of the shaft is improved and the vibration of the steel shaft is approached.

The vibration damping shown in FIG. 4 is the vibration waveform of the golf club shaft that occurs when one end of each golf club shaft is fixed, a weight of a predetermined weight is hung at the other end, and the thread supporting the weight is cut. Is represented.

[Effect of device]

As described above, according to the present invention, a metal-coated carbon fiber aligned in one direction is formed on a tubular body formed by winding a prepreg sheet in which carbon fiber is impregnated with a thermosetting synthetic resin. A prepreg sheet impregnated with a thermosetting synthetic resin is provided with an outer layer coated with the metal-coated carbon fibers aligned in the direction of alignment of the metal-coated carbon fibers with the shaft axial direction, and therefore lightweight, rich in elasticity, and While maintaining the original strength of the carbon shaft, which has strength, the feel of a nice shot hitting the sweet spot and the feel of hitting the sweet spot outside the sweet spot can be transmitted to the player's hand through the outer layer. as a result,
The player can directly feel the impact at the time of ball impact, and the shot feeling is improved.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG.
A sectional view taken along line II-II, FIG. 3 is an explanatory view showing an example of a method for manufacturing the golf club shaft shown in FIG. 1, and FIG. 4 shows vibration damping in the golf club shaft.
(a) shows a steel shaft, (b) shows a golf club shaft according to the present embodiment, and (c) shows a carbon shaft. 1 ... Golf club shaft, 2 ... Outer layer, 3 ... Tubular body.

Claims (1)

[Scope of utility model registration request] 1. A thermosetting synthetic resin on metal-coated carbon fibers which are aligned in one direction on a tubular body formed by winding a prepreg sheet in which carbon fibers are impregnated with a thermosetting synthetic resin. A golf club shaft, comprising an outer layer obtained by coating a prepreg sheet impregnated with the above-mentioned metal-coated carbon fiber with the alignment direction of the metal-coated carbon fibers aligned with the shaft axial direction.