JP2002291950A - Shaft for golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft for a golf club which is easy to use. SOLUTION: The shaft 10 for the golf club is provided with an inner layer 20 and an outer layer 40. Two reinforced stripes 30 extending in the axial direction of the shaft 10 are provided between these inner layer 20 and outer layer 40. The inner layer 20, the reinforced stripe 30 and the outer layer 40 are formed respectively to have the same length as the shaft 10. Thus, hardness and rigidity are improved with respect to a direction parallel to the reinforced stripe 30. On the other hand, flexibility is improved in a direction vertical to the reinforced stripe 30. As the result of it, the golf club is easy to use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club shaft. In particular, the present invention relates to a golf club shaft that can exhibit the performance of a golf club shaft more.

[0002]

2. Description of the Related Art The shaft of a golf club of its own is made of a fiber composite material such as carbon fiber.
In most cases, the pipe is wound around a fiber sheet or fiber bundle and then solidified by heating. Since the thickness of the wall of the shaft manufactured by such a manufacturing method is substantially uniform, the rigidity and the flexibility in each direction of the circumference are all the same, but such physical properties are almost equal. Conversely, a symmetrical shaft cannot achieve the best performance of a golf club shaft. Because, as a necessary condition when we play golf, it is not necessary that the shaft bends uniformly in all directions, but the head has good flexibility in the front and rear direction of the shaft, The golf ball can be hit farther away with greater flexibility, and if the rigidity of the shaft in the left and right directions is stronger, the head will not deflect left and right, You can hit a golf ball.

[0003] In addition, since many people cannot establish an accurate stance at the beginning of learning golf, after a long period of time, a bad stance cannot be corrected as it is, so that there is a tendency that all hit balls are present every time. Yes, for example, one ball can always be deflected to the left and one ball can always be deflected to the right. Once such a habit is formed, it is very difficult to correct it.

[0004]

SUMMARY OF THE INVENTION The main object of the present invention is to:
It is to provide a golf club shaft which is easy to use.

[0005]

SUMMARY OF THE INVENTION The shaft has relatively high rigidity on the predetermined opposite sides, but the flexibility of another opposite side perpendicular to the aforementioned opposite sides is relatively good. If the golf club shaft is combined according to its physical properties, the golf club shaft is more flexible in the front-rear direction, but the rigidity in the left-right direction is stronger, so the golf ball can be hit far away. Yes, the head is hard to deflect to the left or right, or the shaft shows the best flexibility at the front right or left front, so by having a tendency to jump to the expected side after the golf ball is hit, It can correct the habit of always jumping to another side.

In order to achieve the above object, a golf club shaft provided by the present invention is made of a fiber composite material and has a shape of a conical pipe. On the shaft pipe there are two reinforcing stripes extending along the long axial direction on opposite sides,
The shaft has relatively high rigidity in a direction corresponding to the two reinforcing stripes, but relatively good flexibility in a direction perpendicular to the above-mentioned direction.

[0007]

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

Please refer to FIG. It is a golf club shaft according to one embodiment of the present invention. The shaft 10 as a main body has the same appearance as a normal shaft, and has a conical pipe shape. When the golf club shaft 1 is assembled, one handle 70 is provided at its thick end 11 and its thin end is provided. One head 80 in 12
Is provided.

FIG. 2 is an explanatory sectional view of the shaft 10.
Please refer to the figure. The structure of the shaft 10 of the present embodiment has one inner layer 20, which has the shape of a conical pipe, whose length is the same as the length of the shaft 10,
It is the innermost part of the shaft 10 and is a method of winding a fiber sheet made of a fiber composite material (SHEETR
OLLING METHOD) (Note: conventional technology will be briefly described later).

There are two reinforced stripes 30, which have the shape of a long sheet, this embodiment uses a fiber sheet made of a fiber composite material, but a metal fiber sheet or a thin metal sheet, a thin plastic sheet or the like. You can use a thin sheet with flexibility. The two reinforcing stripes 30 are used for the pipe-shaped inner layer 2.
In this embodiment, the reinforcing stripes 30 are attached to opposite sides of the outer periphery of the inner layer 20 by a method of extending along the long axial direction of the shaft 10. Identical and wide about 1 / the outer circumference of the inner layer 20
6 (ie, an arc of about 60 ″), but its range tolerance is from 20 ″ to 90 ″, and
The proportion of the width of the reinforcing stripe 30 and the outer circumference of the inner layer 20 is the same for any cross section of the shaft 10. That is, the reinforcing stripe 30 is also a conical pipe-shaped shaft 1.
As with 0, one end is wide and the other end is narrow, so that it has a trapezoidal shape corresponding to a change in the thickness of the shaft 10.

There is one outer layer 40, which takes the shape of a conical pipe, which is covered on its inner layer 20 and the outside of the two reinforcing stripes 30, the length of which is identical to the length of the shaft 10, and Similarly, a fiber sheet made of a fiber composite material was formed by the above-described sheet winding method.

The above description of the structure of the shaft 10 of the present embodiment will be briefly described below.
First, the inner layer 20 is molded by a sheet winding method,
See Figure 3 for that. It winds a trapezoidal fiber sheet pre-soaked with epoxy resin on a conical rod-shaped center shaft 90. Before winding, the fiber direction of each fiber sheet is made to assume various predetermined angles with the center shaft 90. Inner layer 20 of the present embodiment
Is formed by folding and winding two fiber sheets 21 and 22. The fiber direction of the first fiber sheet 21 is about + 45 ° relative to the center shaft 90, but the second fiber sheet 21 Since the fiber direction of the sheet 22 exhibits −45 °, the two fiber sheets 21 and 22 are folded in advance so that the fibers intersect each other vertically, and then wound on the center shaft 7 together. By forming the inner layer 20 and winding the first fiber sheet 21 in advance, and then winding the second fiber sheet 22,
That is, the inner layer 20 is formed. Note that FIG.
Please refer to. Conventional techniques, when wrapping a fibrous sheet to form a pipe, may form too many overlapping parts on the outermost and innermost parts of the fibrous sheet (note: ordinary ''Spine (SP
INE) '', which may not exist). The inner layer 20 in this embodiment has the "SPINE" as described above (on the right side of the figure).

Next, please refer to FIG. It has two reinforcing stripes 30 attached to opposing sides of the surface of its inner layer 20, and in this embodiment, one of the reinforcing stripes 30 is attached to the spinal side of the inner layer 20. And the other was correspondingly attached to its opposite side.

The outer layer 40 is wound by a sheet winding method.
Please refer to Fig.5. The outer layer 40 of this embodiment is formed by winding (only one or more) three trapezoidal third fiber sheets 41, and the fiber direction of the third fiber sheet 41 is about 1 shaft.
In parallel with the axial direction of 0, the outer layer covers the outer layer, so that the resistance of the flexible fiber can be enhanced. It was attached to one place of the reinforcing stripe 30.

Depending on demand, a reinforcing sheet layer may be wound around a predetermined section (for example, a kit point) of the shaft 10, and the reinforcing sheet layer is also a fiber sheet whose fiber direction is parallel to the axial direction of the shaft 10. Thereby, it is possible to reinforce emphasis on the most foldable portion of the shaft 10.

The semi-finished product is put in an oven and heated, and the fiber composite material is solidified by heat and solidifies to form a rigid shaft 10 (Note: In actual practice, Also, surface processing such as polishing and painting may be arranged, but that is not the point of the present invention).

Please refer to FIG. The body of the shaft 10 of the present invention is located at the two reinforcing stripes 30,
Since the shaft 10 is slightly thicker than the other portions, the shaft 10 has higher hardness and higher rigidity in the direction X corresponding to the two reinforcing stripes 30, but has flexibility in the direction Y perpendicular to the direction X described above. Is relatively good, please refer to Figure 1. When assembling the golf club 1 with the shaft 10 of the present invention, if the direction X of high rigidity corresponds to the heel portion 81 and the toe portion 82 of the head 80 (that is, the flexible direction Y corresponds to the direction of hitting the ball). When the golf club 1 hits a ball, the head 80 goes out of a state of being deflected left and right, so that it is easy to hit the ball in the sweet section when hitting the ball, and more flexible elasticity is obtained in the front-rear direction. So you can hit the ball farther. Further, since the two reinforcing stripes 30 can strengthen the torsional resistance of the shaft 10, the hitting performance of the ball can be entirely improved.

When the above characteristics are slightly changed and applied, when assembling a golf club, its shaft 10
When the flexible direction Y is not parallel to the direction in which the ball hits, slightly deflect the left or right by a predetermined angle,
When the golf club 1 is pointed diagonally forward, the golf club 1 can be given a tendency to hit the ball to a predetermined side, so that the habit of hitting the usual ball to another side can be corrected. For example, when the flexible direction Y of the shaft 10 points to the front left, the flexibility of the head 80 toward the front left is superior to the flexibility toward the front right. (The degree depends on the angle of deflection in the flexible direction Y) to correct the week of deflection to the right, and vice versa.

As described above, the purpose of the technical means of the present invention is to
The two reinforcing stripes increase the hardness of the opposite sides of the shaft, so that the flexibility and rigidity of the shaft is directional. Further, by assembling a golf club corresponding to the physical properties, the above-described functions can be achieved. In the present invention, the same function can be exhibited even if the two reinforcing stripes do not reach the entire length of the shaft. Further, the reinforcing stripe may be provided on the innermost or outermost part of the shaft (in the case of manufacturing, the reinforcing stripe is pasted on the center shaft in advance, and then the shaft is directly wound with a fiber sheet, or
If the shaft 9 is wound with a fiber sheet and the reinforcing stripe is applied to the surface of the shaft 9, the effect is not so clear if it is provided at the innermost part.
When provided on the outermost surface, if the surface treatment is performed, it may have been polished. Therefore, when the reinforcing stripe 30 is provided in the center of the pipe wall of the shaft 10 as in the above-described embodiment, This is considered to be a better example, since it was pinched between one inner layer 20 and one outer layer 40.

The feature of the structure of the present invention is not limited to application to a shaft manufactured by a sheet winding method.
INGMETHOD). FIG.
Please refer to. It is a sectional explanatory view of a shaft 50 provided by the second better embodiment of the present invention. The shaft 50 also includes one inner layer 52 and one outer layer 54, between which two opposing reinforcing stripes 56 are likewise sandwiched. With the fiber bundle manufactured in the above, spirally wind it around the center shaft, wind it in the opposite direction until the inner layer 52 is formed, and after attaching the two reinforcing stripes 56, The body of the shaft manufactured by the filament winding method, in which the outer layer 54 is formed by winding with a fiber bundle and the shaft 50 is completed, does not have the phenomenon of the spine as described above. Has a uniform symmetry, so that the reinforcing stripe 56 can be arbitrarily attached to the opposite side.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a golf club shaft according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a schematic view showing a procedure for manufacturing a golf club shaft according to an embodiment of the present invention.

FIG. 4 is a schematic view showing a procedure for manufacturing a golf club shaft according to an embodiment of the present invention.

FIG. 5 is a schematic view showing a procedure for manufacturing a golf club shaft according to an embodiment of the present invention.

FIG. 6 is a schematic view showing a shaft of a golf club according to one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 shaft 11 thick end 12 thin end 20 inner layer 21 first fiber sheet 22 second fiber sheet 30 reinforcing stripe 40 outer layer 41 third fiber sheet 50 shaft 52 inner layer 54 outer layer 56 reinforcing stripe

Claims (10)

[Claims] 1. A body formed of a fiber composite material in the shape of a conical pipe and having reinforcing stripes formed along opposing sides along an axial direction, the reinforcing stripes corresponding to the stripes in parallel directions. A golf club shaft characterized by having high hardness and rigidity and high flexibility in a direction perpendicular to the stripe. 2. The golf club shaft according to claim 1, wherein the reinforcing stripe is a fiber sheet formed of a fiber composite material. 3. The golf club shaft according to claim 1, wherein a length of the reinforcing stripe is equal to a total length of the body. 4. The semiconductor device according to claim 1, wherein the body has an inner layer and an outer layer covering the outer side of the inner layer, and the reinforcing stripe is provided between the inner layer and the outer layer. The golf club shaft according to claim 1, wherein 5. The inner layer is formed by winding and solidifying a fiber sheet made of a fiber composite material, and the direction of the fibers is at a predetermined angle with respect to the axial direction of the body. The fiber sheet formed of a composite material is formed by winding and solidifying the fiber sheet, and the direction of the fiber is substantially parallel to the axial direction of the shaft.
The shaft of the golf club described in the above. 6. An outermost portion and an innermost portion of the fiber sheet on which the inner layer or the outer layer is formed, and a reinforcement portion formed by superimposing an excess portion of the fiber sheet, wherein the reinforcing stripe is 6. The golf club shaft according to claim 5, wherein the shaft is provided at a portion where the portions overlap. 7. The fiber sheet forming the internal layer has a first fiber sheet and a second fiber sheet, and the direction of the fibers of the first fiber sheet and the second fiber sheet is in the axial direction of the body. 6. The golf club shaft according to claim 5, wherein the angles are +45 degrees and -45 degrees. 8. A reinforced stripe layer wound around a predetermined position on the outermost part of the body, wherein the reinforced stripe layer is a fiber sheet formed of a fiber composite material, and the direction of the fiber is set in the body. 6. The golf club shaft according to claim 5, wherein the shaft is substantially parallel to the axis. 9. The golf club shaft according to claim 4, wherein the inner layer and the outer layer are all formed by winding and fixing a fiber bundle formed of a fiber composite material. 10. The golf club shaft according to claim 1, wherein each of the reinforcing stripes has a trapezoidal shape corresponding to a change in the diameter of the body.