JPH0229341B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a golf club head made of carbon graphite fiber reinforced plastic (hereinafter abbreviated as CFRP). Conventionally, it has been common to use persimmon wood for golf club heads, especially wood heads. However, since persimmon wood itself is a natural material, golf club heads (hereinafter abbreviated as heads)
It took a lot of time and effort to commercialize it as a product, and it also had drawbacks such as poor yield. There were also problems such as persimmon wood itself becoming a decreasing resource and becoming difficult to obtain. Therefore, Jikko 35-
As proposed in No. 15505, a head made of glass fiber reinforced plastic (hereinafter abbreviated as GFRP), which is made by hardening glass fibers with polyester resin, is known. However, in this GFRP head, the specific gravity of the glass fiber is high, so if left as is, the weight of the molded product would be too heavy.
The core material had to be buried inside the head, but with conventional methods, the core material cannot be held securely within the mold, so the core material may move due to the pressure during molding or the fluidity of the resin. However, when molding is completed, the core material comes out on the surface of the head, and the thickness of the GFRP layer of the outer shell that forms the head becomes uneven, resulting in a decrease in strength and damage. In addition, a method of reinforcing the net by arranging glass fibers in the longitudinal and helical directions has been adopted, but the process of arranging the fibers is very time-consuming and, in addition, the fibers are arranged in the longitudinal and helical directions. If things go wrong, there is a risk that the strength will decrease in response to stress such as bending, compression, and tension caused by the impact stress generated when hitting a ball. In other words, if the ratio of fibers arranged in the longitudinal direction is high and the ratio of fibers arranged in the helical direction is small, the fibers will be strong against bending stress, but will be weak against torsional stress, and will easily break at the neck. It had the disadvantage of In addition, if the ratio of fiber arrangement in the longitudinal direction is low and the ratio of fibers in the helical direction is high, it will be weaker against bending stress and stronger against torsional stress, resulting in disadvantages such as vertical cracks occurring at the neck part. It had Therefore, in order to compensate for these shortcomings, the
-9074 has also been proposed, but in this invention, the former had a GFRP head.
By using a CFRP head, the weight of the head can be reduced due to its lower specific gravity, but it also introduces the following drawbacks. That is, since carbon graphite fibers have a large thread diameter, when short fibers are impregnated with synthetic resin and kneaded, they cannot be kneaded well and become bulky and lumpy, resulting in poor workability. In addition, if the carbon graphite fiber is filled into a mold and molded into a head as it is, the fiber content of the carbon graphite fiber will be around 30%, resulting in insufficient strength, especially in the neck part of the head. If the strength is less than 60%, the ball will not have any strength, so the strength at the neck part is weak, and it has the disadvantage that it is easy to break at the neck part due to the impact stress when hitting the ball. In addition, the fiber content of carbon graphite fiber is low at around 30%,
Because the resin content is high at around 70%, the wear resistance of the sole portion of the head is significantly reduced, and the sole portion has the disadvantage of being easily scraped off by dirt and sand during use. In addition, if the weight of the conventional fiber-reinforced plastic head is light after molding, it is necessary to drill a hole in the head and insert a weight into it to adjust the weight of the head, but this method is difficult to process. However, there were drawbacks such as cracks in the head and poor appearance. In view of these conventional drawbacks, the present invention aims to provide a durable CFRP head that simplifies weight and balance adjustment of the molding head, strengthens the strength of the neck part, and has good productivity. This is a head for a golf club. Embodiment 1 of the present invention will be explained based on the drawings. As shown in FIGS. 4 to 8, the side metal part 6 and the sole part 7 are integrated, and the sole part 7 has a weight storage part for weight adjustment. 8. A side sole member 10 is formed on the side metal portion 6, each having a protrusion 9 for supporting a core material, and a core member 11 is attached to the protrusion 9 for supporting a core material by a braided or woven fabric 12 of carbon or other arbitrary fibers. The core material 13 coated with is supported and placed in a lower mold 18 in the shape of a golf head, and a core material 15 having a substantially neck shape with a mandrel 14 inserted therein is interposed in the neck region of the head. A neck reinforcing member 17 covered with a braid 16 made of carbon or other arbitrary fibers impregnated with synthetic resin is placed on the outer periphery, and an upper mold 21 is placed on it, and carbon or other fibers are injected into the gap between the mold and the main body. This head for a golf club is characterized in that chopped strands or mats of arbitrary fibers are filled with an outer shell reinforcing member 19 impregnated with a synthetic resin, and then pressurized and heat molded. In the second embodiment, a side sole member 10 consisting of a side metal part 6 and a sole part 7 is provided with a weight storage part 8 for weight adjustment and a protrusion 9 for supporting a core material, respectively, and the protrusion 9 for supporting a core material is provided with a center material support protrusion 9. A core material 13 in which a core material 11 is covered with a braided or woven fabric 12 of carbon or other arbitrary fibers is supported and placed in a lower mold 18 in the shape of a golf head, and the neck region of the head is covered with a mandrel 14. Net reinforcement member 1 made of resin-impregnated carbon or other arbitrary fibers
7, the upper mold 21 is placed, and an outer shell reinforcing member 19 made of chopped strands or mat of carbon or other arbitrary fibers impregnated with synthetic resin is placed in the gap between the mold and the main body. This golf club head is characterized by being pressurized and heat molded after being filled. In the head according to the present invention, the side sole member 10 in which the side metal part 6 and the sole part 7 are integrated is provided with a weight storage part 8 for adjusting the weight of the head, and a protrusion 9 for supporting the core material. Since the core material 13 is supported on the protrusion 9, it can be used when the finished weight of the head is slightly lighter or when it is necessary to adjust the swing balance when assembled to a golf club. Insert the weight 22 of the required weight into the weight adjustment weight storage part 8 provided in the side sole member 10 , and screw the screw 2.
By sealing with 3 etc., it is very easy to adjust the weight and swing balance, and since no special processing is required on the head itself, there will be no cracks in the head or poor appearance. , the yield of the molding head is greatly improved. In addition, since the side sole member 10 is provided with a protrusion 9 for supporting the core material 13 in a protruding manner,
Since the core material 13 can be securely fixed in the center of the head, the drawbacks of the conventional method, such as the core material moving due to the pressure during molding or the fluidity of the synthetic resin and reducing the product yield, are avoided. This makes it possible to manufacture heads with stable quality and good yield. In addition, since the core material 13 is made by covering the core material 11 with a braided or woven fabric 12 made of carbon or other arbitrary fibers, the head outer shell reinforcing layer can be formed using only chopped strands or mats as in the past. It is possible to prevent defects such as voids that tend to occur when fibers are formed and the occurrence of non-glue areas that occur due to insufficient fiber content. In addition, by inserting and joining the ends of the braid or fabric 12 covering the core body 11 and the ends of the braid 16 forming the neck part reinforcing member 17 , the neck part and the head body can be bonded together. Because the strength of the joint with the parts is significantly improved, cracks will not occur due to the repeated impact stress caused by hitting the ball.
It was found that there was no risk of breakage, etc., and the durability was significantly improved. In addition, in the present invention, since the thickness of the outer shell reinforcing member 19 of the head can be made as designed, the strength of the head itself is improved, and a head with good feel can be obtained since no strange sounds occur when hitting the ball. . In addition, in the head of the present invention, a neck portion reinforcing member 17 made of a braid 16 of carbon or other arbitrary fibers is arranged in the neck portion with or without the intervening core material 15 for the neck. As a result, even though the content of carbon and other arbitrary fibers in the neck part is 60% or more, when the neck part is inserted through the neck core material 15, an increase in the weight of the neck part is prevented, and the braid 12 is As shown in the figure, since it spreads along the shape of the core material 15 for the neck, the thickness of the reinforcing layer at the neck part becomes uniform and the strength is increased, and since the braid does not converge but spreads out, bending stress is applied. Since it has well-balanced strength against torsional stress and torsional stress, there is no difference in strength depending on the fiber arrangement direction or arrangement ratio as in the past, and durability is significantly improved. As another example, the same effect can be obtained by using a woven fabric instead of a braid as the neck reinforcing member 17, but from the viewpoint of workability, it is easier to use a woven fabric or a cylindrical woven fabric. will be better. Further, as the outer shell reinforcing member 19 of the head, chopped strands of carbon or other arbitrary fibers, mat, SMC (sheet molding compound), etc. can be arbitrarily selected. Furthermore, as another embodiment, as shown in FIG. 9, a core material supporting protrusion 9 is provided to protrude from both the side metal part 6 and the sole part 7 of the side sole member 10 , thereby supporting the core material. can be made even more reliable. Further, as shown in FIG. 10, by providing a protrusion 24 in the weight adjustment weight storage portion 8 of the head and embedding the protrusion 24 in the outer shell reinforcing member 19 of the head,
Side sole member 10 and head outer shell reinforcing member 1
The bonding strength with 9 is significantly improved. Incidentally, in the head of the present invention, a combination of the above embodiments is also possible, and since the sole portion of the head is covered with the side sole member 10 , the sole portion will not be damaged. As described in detail above, the head according to the present invention can provide a golf club head made of carbon or other arbitrary fibers with good productivity and durability.

[Brief explanation of drawings]

FIG. 1 is a plan view of a golf club head. Figure 2 shows A of a conventional GFRP golf club head.
-A cross-sectional view taken along line A. FIG. 3 is a sectional view of a conventional CFRP golf club head. FIG. 4 is a perspective view showing an example of a method for attaching a side sole member and a core material according to the present invention. 5 and 6 are perspective views showing a neck reinforcing member according to the present invention. FIG. 7 and FIG. 8 are a first diagram showing a part of the manufacturing process according to the present invention.
FIG. 3 is a sectional view taken along line A-A and line B-B in the figure. 9 and 10 are perspective views showing side sole members of other embodiments of the present invention. 1...Head, 2...Shaft, 3...GFRP
Layer, 4...Core material, 5...CFRP layer, 6...Side metal part, 7...Sole part, 8...Important adjustment weight storage part, 9...Protrusion for supporting core material, 10 ...Side Sole member, 11... Core body, 12... Braid, 1
3... core material, 14... mandrel, 15... core material for net, 16... braid, 17 ... net part reinforcing member, 18... lower mold, 19... outer shell reinforcing member,
21... Upper mold, 22... Weight, 23... Screw, 2
4...Protrusion.

Claims (1)

[Scope of Claims] 1. A golf club head made of carbon or any other fiber-reinforced plastic, comprising a side sole member that integrates a side metal portion and a sole portion, the side sole member having a weight of any shape. An adjustment weight storage part and a protrusion for supporting the core material are provided at arbitrary locations, and the protrusion for supporting the core material supports the core material covered with a braided or woven fabric of carbon or other arbitrary fibers, and carbon or other material is provided in the neck area of the head. 1. A head for a golf club, characterized in that a reinforcing layer is formed of a braided or woven fabric of arbitrary fibers, and the outer shell is formed of a reinforcing layer of chopped strands or mat of carbon or other arbitrary fibers. 2. The golf club head according to claim 1, wherein an arbitrary number of the core material supporting projections are provided to protrude from the inside of the side metal portion. 3. The golf club head according to claim 1, wherein an arbitrary number of the core material supporting projections protrude from the inside of the sole portion. 4. The golf club head according to claim 1, wherein the core material supporting protrusion is provided in the shape of a protrusion on the outer side of the weight adjustment weight storage section. 5. The head for a golf club according to claim 1, wherein a core material having a substantially neck shape is interposed in the neck region.