JPH1015130A - Shaft for putter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carbon fiber reinforced plastic shaft for a putter, allowing a swing balance to be set at a value near the case of a steel shaft. SOLUTION: A carbon fiber reinforced plastic layer is formed as in inner layer 2, so as to have carbon fiber oriented in an axial direction within the range of ±30 degrees to ±40 degrees, while a carbon fiber reinforced plastic layer is formed as an outer layer 8, so as to have carbon fiber axially oriented within the range of ±20 degrees. Also, an intermediate reinforced plastic layer 5 using at least one of glass fiber and metallic fiber, is laid between the inner layer 2 and the outer layer 8, thereby forming a shaft for a putter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a golf club putter shaft made of carbon fiber reinforced plastic.

[0002]

2. Description of the Related Art Carbon fiber reinforced plastic (CFRP)
Golf club shafts are lighter in weight than conventional steel shafts and have a longer flight distance, so their use as golf club wood shafts and golf club iron shafts has increased dramatically. I have. Such a golf club shaft made of CFRP makes carbon fiber at a predetermined angle with respect to the axial direction of the shaft so that torsional rigidity and bending rigidity are within a desired range, and sufficient impact strength is provided. It is designed to be oriented.

[0003]

However, at present,
The shaft used for the putter is mainly a steel shaft, and the use rate of the CFRP shaft is significantly lower than that of other golf clubs. This is because conventional CFRP golf club shafts are light in weight, and when used for putters, have poor drawer swing balance, making it difficult to perform smooth swinging operations and delicate control. is there. Therefore, golfers who have conventionally used putters with steel shafts tend to dislike the difference in swing balance described above.
This has hindered the spread of putters fitted with P shafts.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a golf club putter shaft made of carbon fiber reinforced plastic capable of setting a swing balance close to that of a steel shaft. .

[0005]

In order to achieve the above object, the present invention provides a carbon fiber reinforced plastic layer in which carbon fibers are oriented in a range of ± 30 ° to 45 ° with respect to the axial direction of a shaft. An inner layer, a carbon fiber reinforced plastic layer in which carbon fibers are oriented within a range of ± 20 ° with respect to the axial direction of the shaft as an outer layer, and an intermediate layer comprising a reinforced plastic layer using at least one of glass fiber and metal fiber. A layer was provided between the inner layer and the outer layer.

Further, the golf club putter shaft of the present invention is characterized in that the total weight of the carbon fibers contained in the inner layer and the outer layer and the total weight of the glass fibers and / or metal fibers contained in the intermediate layer. The ratio was in the range of 7: 3 to 5: 5, and the intermediate layer was provided at a desired position in the axial direction of the shaft.

Further, the golf club putter shaft of the present invention is configured such that the carbon fibers used for the inner layer are high elastic carbon fibers, and the carbon fibers used for the outer layer are high strength carbon fibers.

In the present invention, the intermediate layer comprising a reinforced plastic layer using at least one of a glass fiber and a metal fiber is provided between an inner layer and an outer layer which are carbon fiber reinforced plastic layers. As the weight of the golf club putter shaft approaches the steel shaft, and the carbon fiber reinforced plastic layer in which the carbon fibers are oriented in the range of ± 30 ° to 45 ° with respect to the axial direction of the shaft as the inner layer is located, The mandrel can be easily removed at the time of manufacturing, and the position of the center of gravity of the golf club putter shaft can be adjusted by changing the formation position of the intermediate layer.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiment of the present invention will be described.

FIG. 1 is a perspective view showing the structure of a golf club putter shaft according to the present invention. In FIG. 1, a golf club putter shaft 1 includes an inner layer 2 containing carbon fibers 3, an intermediate layer 5 and an outer layer 8 containing carbon fibers 9.
It has a layer structure.

The inner layer 2 is a carbon fiber reinforced plastic layer in which the carbon fibers 3 are oriented in the range of ± 30 ° to 45 ° with respect to the axial direction of the shaft. ± 3 orientation of carbon fiber 3
If the angle is less than 0 °, twisting is increased and the directionality when hitting the ball is deteriorated, and the bending rigidity becomes too high, which is not preferable. In addition, the orientation direction of the carbon fibers 3 is ± 45.
When the angle exceeds °, the bending rigidity becomes low, and it becomes difficult to adjust the bending rigidity and to distribute the weight. The carbon fiber 3 to be used is a high elastic carbon fiber and / or a high strength carbon fiber, and preferably has an elastic modulus of 24 × 10 ^{3 to} 46 × 10 ^3.
A highly elastic carbon fiber of about kg / mm ² is used. The content of the carbon fibers 3 in the inner layer 2 is preferably about 40 to 80% by weight, and the thickness of the inner layer 2 is 0.5 to 1.
It can be about 0 mm.

The intermediate layer 5 is a layer for bringing the weight of the golf club putter shaft 1 closer to the steel shaft, and is a characteristic layer of the present invention. The intermediate layer 5 is a reinforced plastic layer using at least one of a glass fiber and a metal fiber as the reinforcing fiber 6. As the glass fiber, unidirectional prepreg of glass fiber using E glass or T glass, or woven fabric, or
Braided glass fibers or the like can be used. Further, as the metal fibers, metal fibers such as metal fibers made of tungsten, titanium, boron, an amorphous metal, a titanium-nickel alloy, and fibers made of a mixture of the above metal fibers and carbon fibers can be used. The intermediate layer 5 uses at least one of the above-mentioned glass fiber and metal fiber as the reinforcing fiber 6, and orients the reinforcing fiber 6 in one direction in a range of 0 ° to 10 ° with respect to the axial direction of the shaft. Layers. The content of the reinforcing fibers 6 in the mid layer 5 is preferably about 40 to 80% by weight.
The ratio of the total weight of the carbon fibers 9 contained in the carbon fibers 3 and the outer layer 8 in the inner layer 2 to the amount of the reinforcing fibers (glass fibers and / or metal fibers) contained in the intermediate layer 5 is 7: 3. ~ 5: 5. When the amount of the reinforcing fibers 6 is less than the above range, one of the effects of the present invention of bringing the weight of the golf club putter shaft 1 closer to the steel shaft is not sufficiently achieved, and the amount of the reinforcing fibers 6 is not larger than the above. Exceeds the range, the weight becomes too large and the bending rigidity becomes too large, which is not preferable. In addition, the thickness of the intermediate layer 5 can be about 0.3 to 0.6 mm.

The outer layer 8 is a carbon fiber reinforced plastic layer in which carbon fibers 9 are oriented within a range of ± 20 ° or less with respect to the axial direction of the shaft. ± 20 ° orientation of carbon fiber 9
If it exceeds, the flexural rigidity becomes weak, and the torsional rigidity becomes too large, which is not preferable. As the carbon fiber 9, high elastic carbon fiber and high strength carbon fiber can be used, and high strength carbon fiber having high impact strength is preferably used. The content of the carbon fibers 9 in the outer layer 8 is preferably about 40 to 80% by weight, and the thickness of the outer layer 8 is 0.3 to 0.1%.
It can be about 6 mm.

The golf club putter shaft of the present invention can be manufactured by the same method as a conventional golf club shaft made of carbon fiber reinforced plastic (CFRP).

FIG. 2 is a perspective view showing another embodiment of the golf club putter shaft according to the present invention. FIG. 3 is a sectional view of the golf club putter shaft shown in FIG. FIG. 3 is a sectional view of the golf club putter shaft shown in FIG. 2, taken along line BB. FIG.
4 to 4, the golf club putter shaft 11 has a predetermined length L from the tip side (the left side in FIG. 2).
Has a three-layer structure of an inner layer 12 containing carbon fibers, an intermediate layer 15 and an outer layer 18 containing carbon fibers. On the grip side, the inner layer 12 containing carbon fibers and the outer layer 18 containing carbon fibers have two layers. It has a layer structure.

The golf club putter shaft 1 of the present invention.
The inner layer 12 constituting the golf club putter shaft 1 comprises a carbon fiber reinforced plastic layer in which carbon fibers are oriented in a range of ± 30 ° to 45 ° with respect to the axial direction of the shaft. 2 can be formed. The outer layer 18 constituting the golf club putter shaft 11 is made of a carbon fiber reinforced plastic layer in which carbon fibers are oriented within ± 20 ° with respect to the axial direction of the shaft.
Can be formed in the same manner as the outer layer 8.

The intermediate layer 15 is provided in a range from the tip side of the golf club putter shaft 11 to a predetermined length L. The length L of the formation region of the intermediate layer 15 is equal to the length of the golf club putter shaft. It can be suitable for setting the desired center of gravity position. This intermediate layer 15
Is a reinforced plastic layer using at least one of a glass fiber and a metal fiber as a reinforcing fiber, like the intermediate layer 5 constituting the shaft 1 for a golf club putter. The content of the reinforcing fibers in the intermediate layer 15 is preferably about 50 to 90% by weight, and the total weight of the carbon fibers in the inner layer 12 and the carbon fibers contained in the outer layer 18 and the content of the reinforcing fibers in the intermediate layer 15. It is preferable that the ratio to the amount of the reinforcing fiber (glass fiber and / or metal fiber) is 7: 3 to 5: 5.

In the above embodiment, the intermediate layer is formed over the entire area of the golf club putter shaft, and the intermediate layer is formed over a predetermined length from the tip side. Is not limited to this.
For example, a golf club putter having an intermediate layer provided with two regions on the tip side and the grip side of the golf club putter shaft, a golf club putter having an intermediate layer provided in a predetermined region substantially at the center of the golf club putter shaft, and the like. The position of the intermediate layer, the number of the intermediate layers, and the like can be appropriately set in consideration of the weight, the position of the center of gravity, and the like required for the shaft.

[0019]

Next, the present invention will be described in more detail with reference to examples. Example 1 First, a prepreg obtained by impregnating a highly elastic carbon fiber oriented at ± 40 ° with an epoxy resin (Toray Industries, Inc.)
P405-12 (thickness 0.12 mm)) was wound around a mandrel in three layers to form an inner layer.

Next, four layers of prepreg (WP-103 (0.13 mm thick, manufactured by Daido Sangyo Co., Ltd.)) impregnated with epoxy resin in glass fiber oriented at 0 ° from above are wound around the intermediate layer. Was formed.

Further, a prepreg (P305-17, manufactured by Toray Industries, Inc., having a thickness of 0.17 mm) obtained by impregnating a high-strength carbon fiber oriented at 0 ° from above with an epoxy resin was used.
After forming the outer layer by layer winding, the mixture was thermally cured, the mandrel was pulled out, and both ends were cut so as to have a length of 860 mm, thereby producing a golf club putter shaft (sample 1).

Similarly, except that the orientation direction of the high elasticity carbon fibers in the inner layer and the orientation direction of the high strength carbon fibers in the outer layer were set as shown in Table 1, a golf club putter was prepared in the same manner as in Sample 1 described above. Shafts (samples 2 to 6) were prepared.

As an intermediate layer, a prepreg obtained by impregnating a high-strength carbon fiber oriented at 0 ° with an epoxy resin (P305-17 manufactured by Toray Industries, Inc., having a thickness of 0.17 mm)
A golf club putter shaft (Sample 7) was prepared in the same manner as in Sample 1 except that was used.

In the golf club putter shaft prepared as described above (samples 1 to 6), the ratio of the total weight of the carbon fibers contained in the inner layer and the outer layer to the weight of the glass fibers contained in the intermediate layer is: 6: 4.

Next, for each of the manufactured golf club putter shafts (samples 1 to 7), the mandrel was easily pulled out after the curing step, the shaft weight, the torsional rigidity, the bending rigidity, the center of gravity (distance from the tip side), The club balance was evaluated and measured and the results are shown in Table 1 below. For comparison, the same measurement was performed on a steel shaft having a length of 860 mm (Gold Plus manufactured by Tsurutempa). The above torsional stiffness is obtained by fixing one end of a golf club putter shaft and applying a torsional moment of 1 ft · 1b (13.85 kg · c
Indicates the twist angle when m) is added. The bending stiffness was measured by applying a load of 2.7 kg to a position 60 mm from the tip with the fulcrum at 710 mm from the tip of the shaft (tip side). Further, the club balance was measured by mounting a 317 g putter head on the tip side of the shaft.

[0026]

[Table 1] As is clear from Table 1, Samples 1 to 3 exhibited almost the same weight, torsional rigidity, center of gravity position, and club balance as steel shafts, and were confirmed to be excellent as golf club putter shafts. In these samples, the mandrel was easily pulled out after the curing step.

Sample 4 is almost equivalent to a steel shaft in weight, center of gravity, and club balance.
The torsional rigidity was somewhat insufficient. In addition, Sample 5 exhibited substantially the same weight, torsional rigidity, center of gravity position, and club balance as the steel shaft, but it was somewhat difficult to pull out the mandrel after the curing step. Sample 6
Has low twist but low bending rigidity and cannot be used practically.

On the other hand, Sample 7 was light in weight, the position of the center of gravity and the club balance were different from those of the steel shaft, and the swing operation of the putter was clearly different from that using the steel shaft. (Example 2) A prepreg obtained by impregnating a metal fiber (containing tungsten and boron) oriented at 0 ° with an epoxy resin as an intermediate layer (a hybrid prepreg (thickness: 0.2 mm) of tungsten and carbon manufactured by Tonen Corp.) A golf club putter shaft (Sample 8) was prepared in the same manner as in Sample 1 of Example 1 except that (1) was used. In the preparation of Sample 8, the mandrel was easily pulled out after the curing step.

Next, the shaft weight, torsional rigidity, bending rigidity, center of gravity (distance from the tip side), and club balance of the produced golf club putter shaft (sample 8) were evaluated and measured in the same manner as in Example 1. Table 2 below
It was shown to. For comparison, the same measurement was performed on a steel shaft having a length of 860 mm (Gold Plus manufactured by Tsurutempa).

[0030]

[Table 2] As is clear from Table 2, Sample 8 exhibited almost the same weight, torsional rigidity, bending rigidity, center of gravity position, and club balance as the steel shaft, and was confirmed to be excellent as a golf club putter shaft. (Example 3) Ratio A of the total weight of carbon fibers contained in the inner layer and the outer layer to the weight of glass fibers contained in the intermediate layer
Was set as shown in Table 3 below, except that
The golf club putter shafts (Samples 9 to 13) were produced in the same manner as in Sample 1 above.

Next, the shaft weight, torsional stiffness, bending stiffness, center of gravity (distance from the tip side), and club balance of the manufactured golf club putter shafts (samples 9 to 13) were evaluated in the same manner as in Example 1. The measured values are shown in Table 3 below. For comparison, the same measurement was performed on a steel shaft having a length of 860 mm (Gold Plus manufactured by Tsurutempa).

[0032]

[Table 3] As is clear from Table 3, Samples 9 to 11 exhibited almost the same weight, torsional rigidity, bending rigidity, center of gravity position, and club balance as steel shafts, and were confirmed to be excellent as golf club putter shafts. .

Sample 12 was heavy, had a large amount of change in club balance, had low flexural rigidity, and could not be used as a putter shaft.

Sample 13 was light in weight, the center of gravity position and the club balance were different from those of the steel shaft, and the swing motion of the putter was slightly different from that using the steel shaft.

[0035]

As described above in detail, according to the present invention, carbon fibers are formed as an inner layer by ± 30 ° with respect to the axial direction of the shaft.
A carbon fiber reinforced plastic layer oriented in the range of ~ 45 °, and a carbon fiber reinforced plastic layer in which carbon fibers are oriented in a range of ± 20 ° with respect to the axial direction of the shaft as an outer layer. Since an intermediate layer made of a reinforced plastic layer using at least one of a glass fiber and a metal fiber is provided between the outer layer and the golf club putter shaft, compared with a conventional carbon fiber reinforced plastic golf club putter shaft. As the weight approaches the shaft for golf club putters, the swing balance of the putter rises, enabling smooth swing operation and delicate control. The position can be adjusted, and the inner layer Since carbon fiber reinforced plastic layer of carbon fiber was oriented in a range of ± 30 ° to 45 ° is positioned, the omission of the mandrel during production is easy good production.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the structure of a golf club putter shaft according to the present invention.

FIG. 2 is a perspective view for explaining another embodiment of the golf club putter shaft of the present invention.

3 is a cross-sectional view of the golf club putter shaft shown in FIG. 2, taken along line AA.

4 is a cross-sectional view of the golf club putter shaft shown in FIG. 2, taken along line BB.

[Explanation of symbols]

 1,11: Golf club putter shaft 2,12: Inner layer 3,13 ... Carbon fiber 5,15 ... Intermediate layer 6,16 ... Reinforcement fiber (glass fiber / metal fiber) 8,18 ... Outer layer 9,19 ... Carbon fiber

Claims (4)

[Claims] 1. The method of claim 1, wherein the carbon fibers are arranged in an axial direction of the shaft
A carbon fiber reinforced plastic layer oriented in the range of 30 ° to 45 ° as an inner layer, and a carbon fiber reinforced plastic layer oriented in a range of ± 20 ° of carbon fibers with respect to the axial direction of the shaft as an outer layer; A shaft for a golf club putter, comprising an intermediate layer comprising a reinforced plastic layer using at least one of a fiber and a metal fiber between the inner layer and the outer layer. 2. The ratio of the total weight of the carbon fibers contained in the inner layer and the outer layer to the total weight of the glass fibers and / or metal fibers contained in the intermediate layer is 7: 3 to 5:
5. The golf club putter shaft according to claim 1, wherein the shaft is 5. 3. The apparatus according to claim 1, wherein the intermediate layer is provided at a desired position in an axial direction of the shaft.
Alternatively, the golf club putter shaft according to claim 2. 4. The carbon fiber used for the inner layer is a high-elasticity carbon fiber, and the carbon fiber used for the outer layer is a high-strength carbon fiber. The shaft for a golf club putter according to the above.