JPS59101168A - Head of golf club - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to improvements in golf club heads.

BACKGROUND OF THE INVENTION Today, heads made of synthetic resin such as Evokin resin and carbon fiber are widely used in golf clubs. However, in such a head, the inside of the head is hollow in order to adjust the weight. As a result, although it has become possible to reduce the weight of the head, problems remain in the strength of the head.

An object of the present invention is to provide a golf club head that can reduce the weight of the head by 1'' while improving the strength of the head, and the specific gravity of the inner core body is 0.9.
The following provides a golf club head having an inner core whose surface is coated with a synthetic resin in advance, inside an outer layer material of which the synthetic resin is a part of the constituent element. be.

Hereinafter, the present invention will be explained in detail based on the drawings.

In Figures 1 and 2, ('') is the inner core body;
Four awn parts (5) of an appropriate shape and an appropriate thickness are bored on its surface. The inner core (3) is produced by previously covering the inner core body (1) with a synthetic resin film (2). Furthermore, the inner core (3) is integrally covered with an outer layer material (4). In this embodiment, the portion corresponding to the bottom of the golf club head is as follows:
Direct coating without covering with outer layer material (4)
) was attached, but the entire circumference of the inner core (3) was removed from the outer layer (4).
The coating may be integrated. This coating integration may be performed by transfer molding or compression molding. Alternatively, a cavity may be provided in the outer layer material, and the inner core (3) may be inserted and bonded into this cavity. Note that the inner core body (1) does not necessarily need to be provided with the recess (5).

Although wood having a specific gravity of 09 or less can be used for the material of the inner core body (1), it is also possible to use other materials such as synthetic resin. Epoxy resin, A13S resin, etc. can be used for the synthetic resin layer (2), but the point is that it is sufficient to prevent the synthetic resin in the outer layer material (4) from impregnating the inner core body, and various materials can be used depending on this purpose. resin can be used. Outer layer material (
For 4), materials used in conventional club heads made of carbon fibers can be used; for example, synthetic resins such as epoxy resins or HeBS resins, carbon fibers, fillers, and hardening agents can be used.

BMO made from silica powder, carbonate powder, and carbon fiber can be used as the filler.

Here, to explain the method of manufacturing the head of this club, a square inner core body (1) is manufactured. This is done, for example, by processing wood (desirably hard wood such as citrus or persimmon) into an appropriate shape and drilling a recess (5) in the wood. Next, after drying the wood of the inner core body (1), it is coated with epoxy resin to form a synthetic resin layer (2). this is,
The wood may be coated or sprayed with epoxy resin, or the wood may be immersed in the epoxy resin for a few seconds.

The inner core (3) manufactured in this way is fixed in the mold cavity of a transfer molding machine. Then, raw materials for the outer layer material (4) consisting of epoxy resin, carbon fiber, filler, and hardening agent are put into the bot, heated and softened, and then pressed into a mold to form the material.

At this time, if a space is provided between the inner core (3) and the mold, the entire circumferential surface of the inner core (3) can be covered with the outer layer material (4), and the inner core (3) can be covered with the outer layer material (4). ] in contact with the mold, only this contact surface will not be covered with the outer layer material (4).What is important here is that the inner core (3) has already been coated with the synthetic resin layer (
2), the epoxy resin contained in the outer layer material does not impregnate into the inner core body.

Finally, wait for the outer layer material to harden, then open the mold and take out the molded product.

This molded product becomes a golf club by forming a club head, finishing the surface, attaching a soul plate and a weight for weight adjustment as appropriate, and attaching a shaft to this.

FIG. 6 explains another embodiment, in which the inner core body (11
) are the upper inner core body (ila) and the lower inner core body (11b).
) can be obtained by joining. In this embodiment, in order to reduce the weight of the inner core, a large depression (13) is provided at the center of the joint surface of the lower inner core body (11b),
An appropriate number of small depressions (14) are arranged around it. These depressions may also be provided on the joint surface of the upper inner core body (11a), and the shape, thickness σ, and number of the depressions are free. Further, in order to ensure perfect joining of the upper inner core bodies (1ia) (Iib), corresponding unevenness may be provided on both, and an adhesive may be used to join the two. In addition, (12a
) and (12b) are protrusions provided to more completely integrate the inner core (11) and the outer layer material, and may be provided in an appropriate shape, size, and number. These may be used as the recesses (5) in the first embodiment, and their purpose is to increase the surface area of the inner core in order to help integrate the inner core with the outer layer material. Well, the quantity can be considered.

Although not shown in the drawings, the inner core may be formed from six or more members (for example, an upper layer member, a middle layer member, and a lower layer member in the vertical direction, or a right layer member, a middle layer member, and a left layer member in the lateral direction). ), the inner core can be made into a hollow structure by forming the middle layer member into a donut shape and sandwiching it between two other members. This is similar to the depression (13
1 (14), by providing a space inside the inner core, the importance of the inner core is reduced without reducing the strength of the inner core itself, and this method is suitable for this purpose. Therefore, various methods can be adopted.

Regarding the manufacturing method, in addition to the manufacturing method mentioned above,
The following methods are also possible. That is, first, the bottom of the outer layer material is opened, and a cavity in the shape of a cylinder or a truncated cone is formed. Next, a cylindrical or truncated conical inner core coated with a synthetic resin in advance is inserted into the cavity from the bottom opening of the outer layer material. Then, the inner core of and is bonded to the outer layer material cavity wall to integrate it.

As described above, the present invention has an inner core in which the inner core body with a specific gravity of 09 or less is coated with synthetic resin inside the outer layer material of the head, so compared to the conventional head in which the interior is hollow. , it is possible to improve the strength of the head. Moreover,
Since the specific gravity of the inner core body is 09 or less, the ratio M1.4
It is lighter than the front and rear outer layer materials, allowing the overall weight of the head to be reduced accordingly. Particularly important in the present invention is that since the inner core body is coated with synthetic resin in advance, the synthetic resin in the outer layer material does not impregnate into the inner core body.

This means that if the inner core body is not coated with synthetic resin in advance and the outer layer material is integrated with the coating by transfer molding, etc., the outer layer ≠ the synthetic resin in the material during molding will be about 201 to 307 wood, etc. This prevents the situation in which the inner core is impregnated into the inner core body, which increases the weight of the inner core and thus the weight of one core. Therefore, the present invention can have a light inner core body in a light 11 head, and as a result, it can be widely adopted even in golf clubs for women that require lightness.

Furthermore, as in the second embodiment, if a cavity is provided inside the inner core body, the weight of the inner core and thus the weight of the club head can be further reduced by 1". Furthermore, since this cavity is provided inside the inner core, the strength of the inner core is only slightly reduced, and the overall strength of the club head is not significantly reduced, resulting in a head that is stronger than conventional heads. can be provided.

In addition, since the inner core body is covered with synthetic resin and the inner core is further covered with an outer layer material, there is no risk of moisture entering the inner core body, and the inner core body is made of wood. Even when the inner core body is wet, there is no fear that the weight of the inner core body will increase due to the moisture that has entered.

Next, by increasing the surface area of the inner core body by providing the four parts (5) in the first embodiment and the protrusions (12a) (12b) in the second embodiment, the inner core and the outer layer material are integrated. It is possible to further improve the strength of the head.

As described above, the present invention has been able to simultaneously solve the incompatible problems of reducing the weight of the head and strengthening the head.

[Brief explanation of the drawing]

FIG. 1 shows the inner core body in one embodiment of the present invention.
FIG. 2 is a front partial cross-sectional view of a golf club head using the inner core body of FIG. 1, and FIG. 6 shows an inner core body in another embodiment. (1), (111... Inner core body, (2)... Synthetic resin membrane, (3)... Inner core, (4)... Outer layer member. Applicant: Tsuneyuki Shittle Co., Ltd.

Claims (1)

[Claims] The inner core has a specific gravity of 0.2 or less and the surface of the inner core body is coated with synthetic resin in advance, and is provided inside the outer layer material of which synthetic resin is a part of the constituent element. golf club head.