JP3026129U - Balance shaft at hand - Google Patents

Abstract

(57) [Abstract] [Problem] It is possible to manufacture a hand-held balance shaft with a center of gravity on the hand side without changing the condition of the club shaft, and at the same time, it is possible to distinguish the hand-held balance shaft from the appearance. To provide a balance shaft at hand. SOLUTION: A glass fiber sheet 8 and a metal fiber mesh sheet 9 sandwiched between the glass fiber sheet 8 on the near side 6 of a club shaft 2.
A hand-held balance shaft, which is formed by winding a weighted fiber sheet body 7 made of.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to an improvement of a balance shaft at hand, which is formed by winding a weighted fiber sheet body on the hand side of a club shaft, particularly a weighted fiber sheet body in which a metal fiber mesh sheet prepreg is sandwiched between glass fiber sheets. Regarding the balance shaft at hand.

[0002]

[Prior art]

 In recent years, as the golf population has been increasing, there is increasing interest in extending the flight distance of a golf ball and making an accurate impact. For this reason, golf clubs have been actively improved, and many clubs have been put on the market that have improved flight distances and have a proper impact performance. By the way, regarding the improvement of flight distance, it is said that by placing the center of gravity of the club shaft on the hand side (BUTT side) as much as possible, it is easy to accelerate the rotation of the head when swinging.

Therefore, a hand-held balance shaft has been designed to move the center of gravity of the shaft to the hand side. By the way, in recent club shafts, the material has been developed and carbon fiber is used. Unlike a metal shaft made of steel or the like, the degree of freedom in design is great, such as the thickness of the shaft can be changed by increasing the number of prepreg layers to be wound and formed.

Therefore, in order to produce a hand-held balance shaft in which the center of gravity of the shaft is moved to the hand side as much as possible, the following two methods are adopted. One is a method of weighting the club shaft by increasing the thickness on the proximal side and simultaneously decreasing the thickness on the front end side (TIP side). The other is a method of forming metal fibers by winding metal fibers between carbon fiber prepreg layers on the proximal side of the club shaft during molding.

In the former method, increasing the thickness of the club shaft on the proximal side means that a large amount of carbon fiber prepreg is wound around that, and there is a problem that the proximal side becomes an extremely hard club shaft. It was Further, reducing the wall thickness on the tip side has a problem that the strength of the tip of the shaft is also significantly reduced. The strength of the tip of the shaft is particularly important, and if it is reduced, it will lead to damage at the time of impact and is extremely dangerous.

In the latter method, the method of winding the metal fiber between the prepreg layers of the carbon fiber at the time of molding on the hand side and molding the metal fiber and the carbon fiber are originally materials that are difficult to be familiar with each other. There is a feeling of strangeness in joining the two. When the carbon fiber prepreg is wound around the metal fiber, a step is generated between the layers and bubbles are mixed and fixed, resulting in a decrease in strength. As described above, neither method is necessarily satisfactory, and moreover, neither the former method nor the latter method can be distinguished from the appearance that it is a balance shaft at hand.

[0007]

[Problems to be solved by the device]

 The present invention is intended to solve the above problems. That is, the object of the present invention is to manufacture a hand-held balance shaft having a center of gravity on the hand side without changing the condition of the club shaft, and at the same time, it is possible to distinguish the hand-held balance shaft from the appearance. It provides a hand-held balance shaft.

[0008]

[Means for Solving the Problems]

 Then, the inventors of the present invention have conducted earnest research on such a problem by paying attention to the properties of glass fiber. As a result, we found a clue to solve the above problems in the combination of relatively transparent glass fiber and metal fiber mesh sheet prepreg which is a metal sheet, and completed the present invention based on this finding.

That is, the present invention resides in a hand-held balance shaft formed by winding and forming a weighted fiber sheet body composed of a metal fiber mesh sheet prepreg sandwiched between glass fiber sheet prepregs on the hand side of the club shaft. The weighted fiber sheet body is a balance shaft at hand formed by molding a metal fiber mesh sheet prepreg so that it can be visually observed from the vicinity of the grip portion. Furthermore, the balance shaft at hand can check the degree of balance at hand by the degree of exposure of the weighted fiber sheet body from the grip.

[0010]

[Action]

 The weighted fiber sheet body, which is a metal fiber mesh sheet sandwiched between glass fiber sheets, is wound and molded on the uppermost layer on the proximal side of the club shaft, so it is easy to handle without changing the tone of the club shaft. It is possible to manufacture a balance shaft with the center of gravity at the center. Also, since the weighted fiber sheet body is wound around the club shaft at the hand side, it can be visually confirmed at a glance that it is the balance shaft at hand.

[0011]

[Embodiment of device]

 Hereinafter, the present invention will be described based on the drawings with reference to the embodiments. FIG. 1 is a diagram showing an entire golf club. The club shaft 2 of the golf club 1 has a head 3 mounted on the tip side 5 and a grip 4 mounted on the hand side 6. Further, a weighted fiber sheet body 7 is provided in the extended portion of the grip 4, and this sheet body serves as a shaft in which the center of gravity of the golf club 1 is moved to the hand side as much as possible, that is, a hand-held balance shaft.

FIG. 2 is a diagram schematically showing a partial cross section of the carbon shaft. (A) is a figure explaining the state in which the weighted fiber sheet body 7 is wound and formed on the near side of the carbon shaft. Further, (b) is a diagram showing a state in which a grip is attached from above the winding-molded weighted fiber sheet body on the hand side of the carbon shaft. As shown in FIG. 2 (a), the carbon shaft is formed by winding a plurality of layers of carbon fiber prepreg, the inner side is a plurality of bias layers 2 a, and the outer side is a plurality of straight layers 2 b (of the carbon shaft). The same direction as the axis).

On the hand side 6 of the carbon shaft 2, a weighted fiber sheet body 7 is wound around the outermost layer of these carbon fiber prepregs. The weighted fiber sheet body 7 is made by sandwiching a metal fiber mesh sheet 9 between two glass fiber sheets 8. Normally, a total of three sheets are integrally formed as the weighted fiber sheet body 7. As the metal fiber mesh sheet 9, an iron, copper, brass, titanium, or stainless steel mesh sheet is used.

Since the metal fiber mesh sheet 9 has a mesh-like structure, by sandwiching it with the glass fiber sheet 8, the glass fiber sheets 8 become familiar with each other, and the metal fiber mesh sheet 9 and the glass fiber sheet 8 are integrated. It is suitable for Therefore, as described in the conventional example, a step does not occur between the layers of the carbon fiber prepreg and the metal fiber, bubbles are not mixed and fixed, and there is no fear of a decrease in strength.

Since the glass fiber sheet 8 has a large specific gravity, it is easy to give weight, and in combination with transparency, it is an optimum material for sandwiching the metal fiber mesh sheet 9 used in the weighted fiber sheet body 7. . The glass fiber sheet 8 is made of synthetic resin such as epoxy resin in a sheet shape and has high transparency. Therefore, the metal fiber mesh sheet 9 can be sufficiently viewed through the glass fiber sheet 8.

Since the glass fiber sheet 8 has a low elastic modulus, it does not act to change the tone of the club shaft 2 extremely. The weighted fiber sheet body 7 having such a structure can be provided on the proximal side 6 of the club shaft 2 at the same time when the club shaft 2 is manufactured. That is, when the club shaft 2 is manufactured by a conventional method, the weighted fiber sheet body 7 is further wound on the outermost layer of the carbon fiber prepreg, and then the pressure-fired form is performed.

By the way, FIG. 3 shows a modified example of the weighted fiber sheet body 7. (A) shows that the metal fiber mesh sheet 9a has a flat mesh shape. In this case, by winding the weighted fiber sheet body 7 around the shaft, it is possible to contribute to the strength in the lateral and vertical directions of the shaft portion at hand. (B) shows the metal fiber mesh sheet 9b in the form of a twill mesh. In this case, by winding the weighted fiber sheet body 7 around the shaft, it is possible to contribute to the strength in the twisting direction of the shaft portion at hand. (C) shows a metal fiber mesh sheet 9c in the form of a so-called punched thin plate having holes.

In this case, it is used when it is desired to move the center of gravity to the hand side. When the weighted fiber sheet body 7 is wound around the club shaft 2, the degree of hand balance can be changed and the shaft balance property can be selected by changing the length of the shaft axial winding. it can. In the present invention, as shown in FIG. 2 (b), when the grip is mounted on the club shaft 2, a part of the weighted fiber sheet body 7 is positively exposed from the grip point. The appearance is visible.

Since the glass fiber sheet 8 is transparent, the metal fiber mesh sheet 9 can be seen through, and it can be confirmed that the club shaft 2 is provided with the weighted fiber sheet body 7. That is, at a glance, the club shaft 2 that has become a product can be easily visually recognized as a balance shaft at hand. The hand-held balance shaft of the present invention is a shaft whose center of gravity moves closer to the hand side as the length of the weighted fiber sheet body 7 increases.

When the length of the weighted fiber sheet body 7 is long, it appears that the weighted fiber sheet body 7 is exposed more from the grip, and it can be seen that the shaft has a center of gravity moved toward the hand side. Conversely, it is possible to sufficiently distinguish the degree of balance of the hand balance depending on how much the weighted fiber sheet body 7 is exposed in the axial direction from the grip. The balance shaft at hand has a subtle effect on the head speed during a swing, and the golfer must select the optimum balance at hand.

In that sense, such a shaft capable of distinguishing the degree of hand balance is extremely useful. Although the present invention has been described above, it is needless to say that the present invention is not limited to the embodiments and various other modifications can be made without departing from the essence thereof. The structure of the metal fiber mesh sheet used for the weighted fiber sheet body can naturally be selected from those other than those shown in the embodiment as long as it is sandwiched between the glass fiber sheets 8 and is familiar.

[0022]

[Effect of device]

 By winding a weighted fiber sheet around the club shaft, it is possible to form a balance shaft with a center of gravity on the club shaft without changing the tone of the club shaft. It can be easily confirmed from the appearance.

[Brief description of drawings]

FIG. 1 is an overall golf club.

FIG. 2A is a cross-sectional view of a carbon shaft on the proximal side, and FIG. 2B is a cross-sectional view showing a state in which a grip is attached to the carbon shaft on the proximal side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Golf club 2 ... Club shaft 2a ... Bias layer 2b ... Straight layer 3 ... Head 4 ... Grip 5 ... Tip side 6 ... Hand side 7 ... Weighted fiber sheet body 8 ... Glass fiber sheet 9 ... Metal fiber mesh sheet

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[Procedure amendment]

[Submission date] December 26, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is an overall golf club.

FIG. 2A is a cross-sectional view of a carbon shaft on the proximal side, and FIG. 2B is a cross-sectional view showing a state in which a grip is attached to the carbon shaft on the proximal side.

FIG. 3 is a view showing a modified example of the weighted sheet body, in which (a) is a flat mesh shape, (b) is a twill mesh shape, and (c) is a punch thin plate shape. Shows the thing.

[Explanation of Codes] 1 ... Golf club 2 ... Club shaft 2a ... Bias layer 2b ... Straight layer 3 ... Head 4 ... Grip 5 ... Tip side 6 ... Hand side 7 ... Weighted fiber sheet body 8 ... Glass fiber sheet 9 ... Metal fiber Mesh sheet

Claims (3)

[Scope of utility model registration request] 1. A hand balance shaft characterized in that a weighted fiber sheet body composed of a glass fiber sheet and a metal fiber mesh sheet sandwiched between the glass fiber sheet and the club shaft is wound and formed on the hand side. 2. The hand-held balance shaft according to claim 1, wherein the weighted fiber sheet body is formed so that the metal fiber mesh sheet of the sheet body is exposed from the grip and visually visible. 3. The hand balance shaft according to claim 1, wherein the balance of hand balance can be confirmed by the degree of exposure of the weighted fiber sheet body from the grip.