JPH0584336A - Grip and manufacture thereof - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a transparent grip with excellent design. [Structure] A transparent or translucent silicone rubber grip part with or without colored and / or pattern pieces is integrally formed on a grip mounting part with or without a pattern or the like. A mold is used, and the silicone rubber grip is integrally formed on the grip mounting portion with good adhesion. [Effect] Since a semi-transparent or transparent silicone rubber is attached as a grip portion with good adhesiveness, a grip having a good design aesthetic appearance can be obtained by raising the background pattern and mixing colors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grip and a method for manufacturing the grip, and more particularly to a grip for a golf club, a fishing rod, a tennis racket, a badminton racket, etc. and a method for manufacturing the grip.

[0002]

2. Description of the Related Art For example, a golf club is shown in FIG.
As shown in (1), it comprises a club head (not shown) provided on the tip side of the shaft 1 and a grip portion 2 provided on the butt side.

Since the grip portion 2 is to be held by the palm and shakes the club, it is required that the grip portion 2 does not slip and can be gripped properly, and in recent years, the rubber grip portion has become mainstream. .. The rubber grip portion 2 is made of rubber having good strength in advance and formed into a tubular shape, and is press-fitted and bonded to the butt side of the shaft.

In this case, there is no problem as long as the grip portion 2 has a good strength, but in the case of a grip portion made of rubber having a low strength, there is a possibility that the grip portion 2 is torn when it is press-fitted into the shaft. Therefore, it is difficult to provide the grip portion 2 having low strength.

In recent years, the clubs, rackets, fishing rods, etc. used for sports and leisure described above have tended to be fashionable, and not only the rubber having good strength as described above, but also the small strength. There is an increasing demand for manufacturing more fashionable grips using rubber. For example, a transparent grip, a grip with a pattern, or the like. Silicone rubber is most suitable as the rubber used for such a grip, but it has a problem in strength, and the above-described method of attaching the grip portion has a drawback such as tearing.

The present invention has been made in view of the above problems, and provides a transparent or semi-transparent, fashionable and practical grip.
And a method for manufacturing the grip thereof.

[0007]

In order to solve the above problems, the grip according to the present invention is a grip in which a colored transparent or translucent silicone rubber grip part is integrally formed on the grip mounting part. The silicone rubber has a visible light transmittance of 75% or more and a refractive index of 1.40 to 1.50.

The second grip according to the present invention is a grip in which a grip portion made of transparent or translucent silicone rubber is integrally molded on a grip mounting portion provided with a color or a pattern, and the silicone rubber is visible light. The transmittance is 75% or more, and the refractive index is 1.40 to 1.50.

A method of manufacturing a grip according to the present invention comprises a step of installing a grip attaching portion to which the grip is attached to a mold which has a grip portion-shaped forming portion and which is composed of an upper die and a lower die. Visible light transmittance after molding is 75
% Or more, and a step of injecting a silicone rubber having a refractive index of 1.40 to 1.50 and a step of curing the silicone rubber are included.

According to the grip of the present invention, since the silicone rubber is provided on the grip mounting portion by integral molding,
Even if the grip part is slightly weak, it can be mounted well, and since the grip mounting part and the grip part are in close contact with each other, the semi-transparent or transparent grip part acts as a lens and the pattern provided on the grip part. The effect of raising the surface is produced, and the design is extremely excellent. Further, by mixing a pigment into the silicone rubber and coloring it, it becomes possible to generate a new color in which the color of the grip mounting portion and the color of the grip portion are mixed, which brings about various design advantages. .. In addition, if you disperse pattern pieces such as metallic foil in silicone rubber, the pattern pieces will appear in a transparent or translucent grip,
Various grips can be manufactured.

Further, since the grip according to the present invention is made of silicone rubber, it has an advantage that it has a good feeling.

According to the grip manufacturing method of the present invention, not only the grip as described above can be easily manufactured, but also the grip is extremely thin and lightweight, for example, 1 mm or less and 20 g.
It is also possible to manufacture the following grips, and there is also an advantage that grips of various outer diameters can be easily manufactured by changing the mold. Furthermore, compared to the method of manufacturing the grip part separately and mounting it on the grip mounting part,
The adhesion between the grip part and the grip mounting part is remarkably improved, and the grip can be bonded to the shaft by applying an appropriate adhesive to the shaft before integral molding, which further improves transparency. be able to. That is, a grip excellent in design can be manufactured.

The present invention will be described in more detail.

[0014]

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a perspective view of a structural example of the present invention. As is apparent from this figure, the grip of the present invention has a grip-shaped grip portion 2 on the butt side of a shaft 1. For example, it has a structure attached by an integral molding method such as rim molding or transfer molding.

Such a silicone rubber has a small tear strength and is preferably 10 to 30 k.
A rubber having a tear strength of g / cm is preferred. This is because, if the tear strength exceeds 30 kg / cm, the grip portion can be manufactured in advance and pressed into the shaft as in the conventional case. If the tear strength is less than 10 kg / cm, the durability is impaired and it is not practical.

As the silicone rubber, one having a visible light transmittance of 75% or more is used. When the visible light transmittance is less than 75%, the transparency is lost and the design becomes unfavorable.

The refractive index is 1.40 to 1.50. When the refractive index is less than 1.40, the lens effect becomes small and the three-dimensional effect may be impaired.

The silicone rubber grip as described above can be colored. In this case, if the amount of the pigment added is large, the visible light transmittance may be impaired, so 0.1 to 10 parts by weight is generally suitable for 100 parts by weight of the silicone rubber. If it is less than 0.1 part by weight, coloring may be insufficient, while if it exceeds 10 parts by weight, visible light transmittance may be lowered too much.

In general, pigments for coloring silicone rubber can be effectively used as these coloring pigments.

Further, a pattern piece can be mixed in the silicone rubber together with a pigment or alone. It is particularly preferable that this pattern piece is a reflection piece that reflects light. For example, it is possible to mix aluminum pieces, metallic pieces such as gold foil, pearl pieces, and glass beads.

The pattern piece is preferably mixed in an amount of 0.5 to 5 parts by weight with respect to 100 parts by weight of the silicone rubber. If the amount is less than 0.5 parts by weight, the pattern piece may not be lifted up, and the design effect may be small. On the other hand, if the amount exceeds 5 parts by weight, the grip may be brittle.

Further, the size of this pattern piece is preferably 3
It is preferably about 500 μm. If it is less than 3 μm, there is a possibility that the excellent effect in terms of design may not be obtained.
If it exceeds 00 μm, moldability may be impaired, strength may be reduced, and durability may be reduced.

Next, the grip mounting portion is not basically limited in the present invention. A pattern or color is particularly preferable, but a background color may be used.

The method of providing the pattern or color of the grip mounting portion is not basically limited in the present invention. For example, it can be performed by printing, painting, etc., and it may be a cloth or paper on which a pattern or color is printed.

The grip as described above can be manufactured with a hardness of Hs 30 to 70 by changing the hardness and material of the silicone rubber.

Next, a method of manufacturing the grip of the present invention will be described. As shown in FIG. 2, a mold which has a grip-shaped molding portion and is composed of an upper mold 3 and a lower mold 4 and which can be divided into two halves. The butt side of the shaft 1 is installed in, and, for example, a two-component silicone rubber is injected through the injection port 31 of the upper mold and is cured by reaction. At this time, when an adhesive such as an epoxy resin adhesive, a phenol resin adhesive, or a titanium coupling adhesive is applied to the grip mounting portion of the shaft 1, the shaft and the grip are completely adhered and good transparency is obtained. So, you can have a firm and firm grip.

On the contrary, when the adhesive is not used, the grip having a soft feeling can be obtained. Even if an adhesive is not used, when the silicone rubber contracts after molding, the air mixed between the grip part and the grip mounting part is pushed out from the open end 21 of the grip part, and the grip part and the grip mounting part are Since the adhesiveness of is increased, the grip can be sufficiently used.

When no adhesive is used in this way,
As shown in FIG. 3, it is preferable to cover the open end of the grip portion 2 with the cap 3. This is to prevent air from entering the open end and impairing adhesion.

When injecting silicone rubber,
The stopper 4 may be filled in a predetermined portion of the hollow portion 11 of the shaft 1 so that the silicone rubber is filled from the open end of the butt portion of the shaft to the portion of the hollow portion 11 where the stopper 4 is filled. In this case, for example, grips for advanced users and professionals who desire a heavy grip can be manufactured.

On the other hand, when a lightweight grip is desired, the stopper 4 is used to close the young end of the bat, and the hollow portion 1
Make sure that 1 is not filled with silicone rubber.

Since the shaft 1 as described above is generally made of an epoxy resin, the molding condition is 100.
It is preferable to carry out under conditions of ~ 140 ° C and 3-30 minutes. If the molding temperature is lower than 100 ° C, the rubber may not be sufficiently cured, while if it exceeds 140 ° C, the epoxy resin of the shaft may deteriorate. If the molding time is less than 3 minutes, the rubber may not be sufficiently cured, and if it exceeds 30 minutes, the epoxy resin may be deteriorated.

A protective coating may be further applied to the grip portion formed as described above. This protective coating is for preventing color transfer or yellowing because the silicone rubber easily absorbs color and the like.

In the above description, the golf shaft was described as an example, but it is obvious that the present invention can be similarly applied to grips such as fishing rods, tennis rackets, and badminton rackets.

[0034]

EXAMPLE Using the mold shown in FIG. 2, a grip part was integrally formed on the butt side of a plastic shaft with a two-component silicone rubber for LIM molding using a LIM molding machine. The molding conditions were 130 ° C. and 5 minutes. The total light transmittance of the integrating sphere turbidimeter of the silicone rubber was 88%, and the refractive index was 1.45.

Also, a pattern was provided on the grip mounting portion by printing.

The tear strength of the thus manufactured grip portion was 25 kg / cm, and it was sufficiently usable as the grip portion. Further, the adhesiveness was good, and the pattern appeared to be raised, and the design was good. Furthermore, when using an adhesive, rubber movement is reduced when gripped,
A firm and firm grip was obtained. The transparency was also good.

[0037]

As described above, according to the grip of the present invention, since the silicone rubber is integrally molded to the grip mounting portion, it can be mounted satisfactorily even if the strength of the grip portion is slightly insufficient. Since the mounting portion and the grip portion are in close contact with each other, the semi-transparent or transparent grip portion has the effect of acting as a lens to raise the pattern provided on the grip portion, which is extremely excellent in design. Further, by mixing a pigment into the silicone rubber and coloring it, it becomes possible to generate a new color in which the color of the grip mounting portion and the color of the grip portion are mixed, which has various design advantages. . Further, by dispersing pattern pieces such as metallic foil in silicone rubber, various grips can be manufactured such that the pattern pieces float up in a transparent or translucent grip.

Further, since the grip according to the present invention is made of silicone rubber, it has an advantage that the feel is good.

According to the grip manufacturing method of the present invention, not only the grip as described above can be easily manufactured, but also an extremely thin grip, for example, having a thickness of 1 mm or less and 20 g or less can be manufactured. 40 at present
Although it was not possible to manufacture a lightweight grip of g or less, the method according to the present invention can manufacture a lightweight grip as described above, so that it is possible to provide a lightweight golf club, which is easy to swing for an amateur and has good flight. Can provide clubs.

On the other hand, advanced players such as professionals tend to want a heavy and firm grip,
This case can be easily dealt with.

There is also an advantage that grips of various outer diameters can be easily manufactured by changing the mold.

Further, as compared with the method of manufacturing the grip part separately and mounting the grip part on the grip mounting part, the adhesion between the grip part and the grip mounting part is remarkably improved, and a grip excellent in design can be manufactured.

The grip mounting portion has a thickness that fits inside the outer diameter of the grip, and may be thin as long as it has strength enough for injection molding, and the grip shape can be kept constant depending on the mold size. it can. At that time, there is also an advantage that the feeling of gripping can be appropriately handled depending on the material, hardness, strength and the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a configuration example of the present invention.

FIG. 2 is an explanatory diagram illustrating a method of the present invention.

FIG. 3 is a perspective view of a grip manufactured according to the present invention.

FIG. 4 is a sectional view of an example of a grip according to the present invention.

FIG. 5 is a perspective view of a conventional grip.

[Explanation of symbols] 1 shaft part 2 grip part 3 cap 4 stopper

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Claims (11)

[Claims] 1. A grip in which a colored transparent or translucent silicone rubber grip portion is integrally formed on the grip mounting portion, the silicone rubber having a visible light transmittance of 75% or more, and having a refractive index of at least 75%. The rate is 1.40 to 1.
A grip characterized by being 50. 2. The grip according to claim 1, wherein a pattern piece is mixed in the silicone rubber. 3. The grip according to claim 1 or 2, wherein the hardness of the grip is Hs 30 to 70. 4. A grip in which a grip portion made of transparent or translucent silicone rubber is integrally formed on a grip mounting portion provided with a color or a pattern, wherein the silicone rubber has a visible light transmittance of 75% or more. And a grip having a refractive index of 1.40 to 1.50. 5. The grip according to claim 4, wherein the silicone rubber is completely colored. 6. The grip according to claim 4, wherein pattern pieces are mixed in the silicone rubber. 7. The grip according to claim 4, wherein the hardness of the grip is Hs 30 to 70. 8. A step of installing a grip attaching portion to which a grip is attached in a mold which has a grip-shaped forming portion and which is composed of an upper die and a lower die, and a visible light transmittance after the forming. Is 75% or more, and the refractive index is 1.40.
A step of injecting a silicone rubber so as to be 1.50,
A method of manufacturing a grip, comprising the step of curing the silicone rubber. 9. The method of manufacturing a grip according to claim 8, wherein protective coating is performed after the silicone rubber is cured. 10. The method for manufacturing a grip according to claim 8, wherein the grip mounting portion is provided with a color or a pattern. 11. An adhesive agent is applied to the grip portion of the shaft in advance.
How to make either grip.