JPH0230268B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a golf club head made of carbon fiber or any other fiber-reinforced plastic. 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,
It took a lot of time and effort to commercialize a head for a golf club (hereinafter abbreviated as head), 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 head would be too heavy, so a core material had to be buried inside the head, but conventional methods In this case, the core material cannot be held securely in the mold, so the core material moves due to the pressure during molding and the fluidity of the resin, and when molding is completed, the core material may come out on the surface of the head or form a head. of the outer shell
There were drawbacks such as a decrease in strength and breakage due to the non-uniform thickness of the GFRP layer. 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%,
Since 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 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 simplifies the weight adjustment and balance adjustment of the molding head, strengthens the strength of the neck part and the entire head, and is made of fiber-reinforced plastic (hereinafter referred to as "molding head"), which has good productivity and durability.
This is a golf club head made for the purpose of supplying FRP heads. Examples of the present invention will be described based on the drawings.
As shown in FIGS. 4 to 7, a side sole member 12 in which a side metal portion 10 and a sole portion 11 are integrated is disposed, and a weight adjustment weight of an arbitrary shape is provided on the side sole member 12. A storage portion 13 and a core support protrusion 14 are provided, respectively.
Further, the core body 6, which is the core of the head, is covered with carbon fiber or other reinforcing fiber members 7, and an appropriate number of braided or cylindrical fabrics 8 made of carbon fiber or other reinforcing fibers are further coated thereon to cover the entire head. The core 6 of the head outer shell reinforcing member 9 is inserted into the core supporting protrusion 14 of the side sole member 12 , and is simultaneously integrally molded with synthetic resin. This is a head for a golf club. In the head according to the present invention, a weight storage portion 13 for adjusting the weight of the head is provided in a side sole member 12 in which the side metal portion 10 and the sole portion 11 are integrated.
The finished weight of the head is slightly lighter because it is provided with a core support protrusion 14 and is designed to support the core body 6, which is the core of the head, on the protrusion 14. or if it is necessary to adjust the swing balance when assembled to the golf club, the side sole
By inserting a weight 18 of the required weight into the weight adjustment weight storage part 13 provided in the head 2 and sealing it with screws 19, etc., weight adjustment and swing balance can be adjusted very easily. Since no extensive machining is required, the head does not suffer from cracks or poor appearance, and the yield of the molded head is greatly improved. In addition, since the side sole member 12 is provided with a protrusion 14 for supporting the core body 6 in a protruding manner,
Since the core body 6 can be securely fixed at the center of the head,
It is possible to avoid the drawbacks of conventional methods, such as the core moving due to the pressure during molding and the fluidity of the synthetic resin, resulting in a decrease in product yield, and it is possible to manufacture heads with stable quality and good yield. . In addition, the core body 6 is covered with a braided or cylindrical fabric 8 made of carbon fiber or any other reinforcing fiber, and a reinforcing fiber member 7 is filled in order to eliminate the gap between the core body 6 and the braided or cylindrical fabric 8. , the fiber content of the head itself is 60
% or more, it eliminates voids that tend to occur when the head outer shell reinforcing layer is formed only with chopped strands or pine, as in the past, and defects that occur due to insufficient fiber content. It is possible to prevent defects such as the occurrence of glue defects and glue defects. Also core body 6
Since the braided or cylindrical fabric 8 covering an appropriate number of layers is extended to the neck part and integrated, the strength from the neck part to the head main body part is increased, unlike the conventional one in which the head body and the neck part are joined. This significantly improves the impact resistance caused by repeated impact stress caused by batted balls.
Accidents such as breakage are significantly reduced, and durability is greatly improved. Further, in the present invention, the outer shell reinforcing member 9 of the head
Since the thickness of the head can be made as designed, the strength of the head itself is improved, and the weight distribution of the head itself can also be made almost as designed. Therefore, the balance during the swing is good, and since no strange sounds occur when the ball is hit, a head with good feel can be obtained. In particular, when carrying out the present invention, by using a braided or cylindrical fabric made of carbon fiber and also using carbon fiber for the filling member, the vibration damping effect at the time of hitting the ball also acts mutually, so it is ideal. It is possible to supply a head for a golf club. Furthermore, as another example, as shown in FIG .
By protruding from both the side metal part 10 and the sole part 11 of the core, the core can be supported more reliably. Further, as shown in FIG. 9, by providing a protruding piece 20 in the weight adjustment weight storage part 13 of the head and embedding the protruding piece 20 in the head outer shell reinforcing member 9 , the side sole member 12 and the outer part of the head are connected. The bonding force with the shell reinforcing member 9 is significantly improved. Incidentally, in 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 12 , the sole portion will not be damaged. As detailed above, the head according to the present invention can provide a golf club head made of carbon or any other fiber-reinforced plastic with good productivity and durability.

[Brief explanation of drawings]

FIG. 1 is a plan view of a golf club head. Figure 2 is a cross-sectional view taken along line E--E of a conventional GFRP golf club head. Figure 3 is a sectional view of a conventional CFRP golf club head. FIG. 4 is a perspective view showing a head outer shell reinforcing member according to the present invention. FIG. 5 is a perspective view showing the head outer shell reinforcing member and side sole member before being attached. 6 and 7 are cross-sectional views taken along the E--I line and the Ro-Ro line in FIG. 1, showing a part of the manufacturing process according to the present invention. FIGS. 8 and 9 are perspective views showing side sole members according to other embodiments of the present invention. 1...Head, 2...Shaft, 3...GFRP layer, 4
... Core material, 5... CFRP layer, 6... Core body, 7... Reinforcing fiber member, 8... Braided or cylindrical fabric, 9 ... Head outer shell reinforcing member, 10... Side metal part, 11... Sole part, 12 ... Side sole Member, 13... Weight adjustment weight storage part, 14... Core support protrusion, 15... Mandrel, 16... Lower mold, 17... Upper mold, 18... Weight,
19...screw, 20...protrusion.

Claims (1)

[Scope of Claims] 1. In a golf club head made of carbon fiber or any other fiber-reinforced plastic, a side sole member in which a side metal portion and a sole portion are integrated is disposed, and the side sole member includes: A weight storage part for weight adjustment of an arbitrary shape and a protrusion for supporting the core body are provided, and the core body, which is the core of the head, is covered with carbon fiber or any other reinforcing fiber material, and furthermore, carbon fiber or other arbitrary reinforcing fiber material is coated on top of the core body, which is the core of the head. A suitable number of braided or cylindrical fabrics are coated to form a head outer shell reinforcing member that forms the entire head, and the core in the head outer shell reinforcing member is inserted into the core supporting protrusion of the side sole member. A golf club head characterized by being simultaneously integrally molded from resin. 2. The head for a golf club according to claim 1, wherein an arbitrary number of the core material supporting protrusions 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 head for a golf club according to claim 1, further comprising a protrusion provided on the sole portion in addition to the protrusion for supporting the core material and provided on the outer side of the weight storage portion for weight adjustment.