JPH0641562Y2 - Iron Golf Club Head - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an iron golf club head mainly made of fiber reinforced plastic, and more specifically, a metal frame with a more effective toe-heel balance, The present invention relates to an iron golf club head capable of adjusting the wall thickness of a fiber reinforced plastic by combining with a high-strength core.

[Prior art]

Conventionally, an iron golf club head mainly made of fiber reinforced plastic (generally called a carbon iron golf club head) is composed of a hosel part and a sole part continuous with the hosel part, and a metal frame, and The frame is covered with fiber reinforced plastic to be integrally formed.

By the way, in general, a wood golf club head made of fiber reinforced plastic has a post-processing of the score line of the face portion, but in the case of an iron golf club head, it is necessary to form at the same time from the shape of the head at the time of molding.
Moreover, the smoothness of the face is also required.

However, in an iron golf club head mainly made of fiber-reinforced plastic, the face surface may become uneven due to the distortion caused by the effective shrinkage of the matrix resin during molding. It was necessary to carry out the cutting work and finishing work.

Further, in the case of an iron golf club head whose main material is a conventional fiber reinforced plastic, it is difficult to adjust the wall thickness of the fiber reinforced plastic of the entire club head. For example, when the wall thickness is thin, the strength of the thin portion is reduced. On the other hand, when the wall thickness is large, there is a problem that internal shrinkage occurs due to the effective shrinkage of the material, and the strength of the fiber reinforced plastic decreases due to the occurrence of weld lines.

[Purpose of device]

The present invention has been devised in view of such conventional problems, and the purpose thereof is to form a notch portion on the back side excluding the toe side and the heel side in a sole portion having a constant width. In this way, the toe-heel balance of the club head is made effective, and the core material is made of high-strength material to strengthen the back of the ball striking surface to reduce energy loss at the time of hitting, and further The present invention provides an iron golf club head which can facilitate the design of the wall thickness adjustment of the fiber reinforced plastic portion of the entire club head by using a material whose specific gravity can be adjusted.

[Constitution of device]

In order to achieve the above-mentioned object, the present invention forms a notch portion on the back side excluding the toe side and the heel side in the sole portion having a constant width, and the face surface is formed on the sole portion of the metal frame thus formed. A core body made of a lightweight composite material having a Shore D hardness of 70 or more, which is located on the back surface side of the base material and has a predetermined width on the bottom side, is provided. The toe-heel balance of the club head is made effective by covering it with reinforced plastic to make it integral, and by using a high-strength material as the core material, the back surface of the ball striking surface is strengthened and at the time of hitting the ball. The energy loss of the club head is reduced, and by using a material whose specific gravity can be adjusted for the core material, it is easy to design the thickness adjustment of the fiber reinforced plastic part of the entire club head and improve the productivity. It is an Abstract that was.

[Example of device]

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 is a front view of an iron golf club head embodying the present invention, and FIG. 2 is a vertical sectional front view of FIG.
The club head body 1 includes a hosel portion 2 for connecting a shaft.
A metal frame 4 integrally formed with a sole portion 3 having a sole width H (for example, a # 2 iron and a maximum of about 35 mm) as shown in FIG. 3 and FIG. The core body 5 made of a lightweight composite material placed on the core body 5 and the metal frame 4 excluding the sole portion 3 and the fiber reinforced plastic 6 covering the core body 5 are integrally formed.

The sole portion 3 has a notch portion X formed by notching the back side 3c except the toe side 3a and the heel side 3b, and the thick portion 7a is formed on the toe side 3a and the heel side 3b. Due to
A large amount of the weight of the club head body 1 is distributed to the toe side 3a and the heel side 3b for toe / heel balance, a wide sweet area is formed, and the wall thickness portion 7a is shaved so that the weight can be adjusted.

The core body 5 made of the lightweight composite material is
Matrix of composite material with impact strength (strength enough to withstand impact when hitting ball) and surface strength (Shore D) of 70 or more, such as epoxy resin, unsaturated polyester resin, vinyl ester resin, polyurethane resin, etc. Used as a resin. As for the shape, the thickness is at least 3 mm or more, preferably 5 mm or more by compression molding or injection molding in advance, and the thickness on the bottom side is increased so that the cross-sectional shape can be placed on the sole part 3. It is molded into a substantially triangular shape.

Further, in this example, as the material of the core body 5, BMC (block molding compound, specific gravity 1.20 to 1.60: Showa High Polymer Chemistry) containing short glass fibers and glass microballoons and using unsaturated polyester as a matrix. Made by injection molding, the specific gravity is 1.50g / cm ³ ,
A core body having a hardness (Shore D) of 95 was molded.

The following materials can be applied as other materials.

SMC: Sheet molding compound, CFRP: Carbon fiber reinforced plastic.

The core body 5 molded as described above is attached to the toe side 3a and the heel side 3b.
It is placed on the sole portion 3 with the back side 3c except for and cut out, and the metal frame 4 and the core body 5 excluding the sole portion 3 are covered with the fiber reinforced plastic 6 and compression-molded to reduce the weight. Further, it is possible to manufacture an iron club head made of high strength fiber reinforced plastic.

Club head body 1 created by the above method
Shows that there are very few irregularities on the face surface due to the curing shrinkage of the matrix resin, and when the molded club head body 1 is cut and its cross section is confirmed, there is little disturbance of the reinforcing fibers and the orientation is good over the entire head. It was confirmed that there was.

Further, when the club head body 1 is made into an iron golf club and the characteristics of the club and the trial hit are performed, the sweet area of the club head body 1 becomes wider than the conventional club head, and the durability against hitting is also increased. It was good.

[Effect of device]

This invention, the sole portion having a constant width as described above,
Form a notch on the back side except the toe side and heel side,
A core body made of a lightweight composite material having a Shore D hardness of 70 or more, which is located on the back surface side of the face surface and has a predetermined width on the bottom surface, is arranged on the sole portion of the metal frame thus formed. Since the metal frame and the core body are integrally formed by covering the metal frame and the core body with the fiber reinforced plastic except for the sole portion, the following excellent effects are obtained.

(A) By forming a notch on the back side of the metal frame excluding the toe side and the heel side and forming the sole portion with a constant width, the weight of the club head main body is distributed more on the toe side and the heel side. By doing so, the toe / heel balance will be more effective, and by widening the sweet area, stable shots can be performed.

(B) Since the core body is integrally formed, the productivity can be improved.

(C) Further, by using a strong material as the core material to strengthen the back of the ball striking surface and reduce energy loss at the time of hitting, the flight distance of the ball is extended and the fibers of the face portion are extended. It is possible to reduce shrinkage during molding of the reinforced plastic layer (distortion due to curing shrinkage of the matrix resin during molding).

(D) Material whose specific gravity can be adjusted to the core material (BMC: specific gravity 1.20 ~
1.60) makes it easier to design the thickness adjustment of the fiber-reinforced plastic part of the entire head.

(E) It is possible to minimize the cutting work of the face portion of the molding, further improve the yield and improve the productivity.

[Brief description of drawings]

FIG. 1 is a front view of an iron golf club head embodying the present invention, FIG. 2 is a vertical sectional front view of FIG. 1, FIG. 3 is a left side view of FIG. 1, and FIG. 4 is of FIG. FIG. 5 is a sectional view taken along line IV-IV, and FIG. 5 is a cross-sectional plan view taken along line VV of FIG. 1 ... Club head body, 2 ... Hosel part, 3 ... Sole part, 3a ... Toe side, 3b ... Heel side, 3c ... Back side, 4 ... Metal frame, 5 ... Core body, 6 …… Fiber reinforced plastic, X …… Notch.

Claims (1)

[Scope of utility model registration request] 1. A metal frame formed by integrally forming a sole portion having a constant sole width and a hosel portion connected to the sole portion, and a fiber reinforced plastic is coated except for the sole portion. In the iron golf club head, the sole portion having the constant width is provided with a cutout portion on the back side excluding the toe side and the heel side, and on the sole portion of the metal frame thus formed, the back side of the face surface is formed. A core body made of a lightweight composite material having a Shore D hardness of 70 or more and having a predetermined width on the bottom side, and the metal frame and the core body are fiber reinforced except for the sole portion. An iron golf club head characterized by being integrally covered with plastic.