JPS6031743Y2 - golf club shaft - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shaft for a golf club that is easy to use for beginners, women, and golfers with relatively weak strength.

Conventionally, golf club shafts (hereinafter abbreviated as shafts) have generally been tapered shafts in which the diameters of the leading end 5 and rear end 6 of the shaft 2 are significantly different, as shown in FIG. , most of them are 100 α rare 6 (6/1000 to 9/10 (9/1000)
) was designed to form a range of tapers.

On the other hand, beginners, women, and golfers with relatively weak strength tend to have slow head speeds when swinging the golf club, resulting in a high launch angle of the golf ball.
A shaft with a soft tip was preferred.

However, carbon fiber reinforced plastic (C
For golf club shafts made by FRP), the taper of the shaft is 6/1000 to 9/10.
Since a shaft in the 00 range is used, there is a drawback that the shaft inevitably has a stiff flex.

Therefore, we reduced the amount of carbon fiber used in the A part of the shaft to make the flex softer.
By supplying a shaft that is easy to bend at the tip, or by using a material with low rigidity such as glass fiber other than carbon fiber for the A part as shown in Figure 3, the flex of the shaft can be softened and the tip can be adjusted. A common method was to feed the shaft.

However, in the former case, since the amount of carbon fiber used is reduced, the rigidity is reduced, and the ball may break due to the bending stress applied to the shaft when hitting the ball.

In addition, the latter case has the disadvantage that concentrated stress is applied to the joint between the carbon fiber and the glass fiber when the ball is hit, and there is a risk of breakage at this joint.

Furthermore, since both shafts have a large taper from the tip to the rear end, they have drawbacks such as increased air resistance of the shaft during swing and slow swing speed.

In addition, shafts with a taper of 6/1000 to 9/1000 have the disadvantage that if the flex is made softer, the strength decreases, so the degree of freedom in design is small.

In view of these conventional drawbacks, the present invention is easy to use for beginners, women, and relatively weak golfers, has a soft flex, is durable, has low air resistance during swing, and has a comfortable feel. The purpose was to provide a shaft of good quality.

To explain the present invention based on the drawings, as shown in Fig. 4, the shaft 2 is reinforced with carbon fiber, characterized in that the taper from the tip 5 to the rear end 6 ranges from 071000 to 4/1000. This is a shaft 9 for a plastic golf club.

As described above, in the shaft 9 of the present invention, the tapered
is smaller than a conventional shaft, and the shape of the shaft itself is almost straight. Therefore, if the diameter of the tip 5 is made the same as the conventional one, a thin shaft will be created, so the flex should be designed to be soft. be able to.

Furthermore, since it has a substantially straight shape, the E1 distribution of the shaft can be changed very easily by appropriately reinforcing parts.

In the golf club equipped with the shaft of the present invention,
The shaft itself is soft and the diameter of the shaft is small, so the air resistance value during swing is small, and the head speed is faster than conventional shafts, so even beginners, women, and relatively weak golfers can use this golf club. Using the club has the effect of increasing the flight distance of the ball compared to before.

In addition, unlike conventional shafts, we have not partially reduced the amount of carbon fiber used to soften the flex or bonded other low-rigidity materials, so the shaft may be affected by impact stress when hitting the ball. It is possible to supply a shaft that is durable and has a good feel without fear of breaking.

Table 1 shows a comparison of the head speeds of golf clubs using the shaft of the present invention and conventional shafts.

Note that the grip portion is thinner than conventional products, so if a foam material or the like is provided around this portion to make it thicker and a conventional rubber grip is attached, no discomfort will occur.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the kick point on the shaft of a golf club and the launch angle of the ball. (D indicates a golf club with a first pitch, and E indicates a golf club with a close pitch.) Fig. 2 is a perspective view showing a conventional shaft. FIG. 4 is a perspective view showing the shaft according to the present invention. 1 Nigel lip, 2: Shaft, 3: Head, 4: Golf ball, θ: Golf ball launch angle, 5: Tip portion, 6: Rear end portion, 7, 9: Carbon fiber reinforced plastic, 8 Nigel fiber reinforced plastic stick.

Claims (1)

[Scope of utility model registration request] The taper from the tip to the rear end of the shaft is 10
1. A shaft for a golf club made of carbon fiber reinforced plastic characterized by having a substantially straight shape ranging from 0 on 009 to 4 on 100.