JPH0715566Y2 - Golf club head - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a golf club head, and more specifically, the impact fracture strength of a core body embedded inside a wood golf club head is increased to improve the durability of the club head. The present invention relates to a golf club head having improved performance.

[Prior Art] Conventionally, most of wood golf clubs made of fiber reinforced plastic have a low specific gravity material, for example, a foamable synthetic resin such as hard urethane foam (Japanese Patent Publication No. 51-21436).
Alternatively, there is known a structure (Japanese Patent Laid-Open No. 60-68873) in which a core body made of syntactic foam or the like in which a micro hollow body is composited with a resin matrix such as an epoxy resin is incorporated.

The wood golf club described above is integrally molded with the core body by compression molding or injection molding, or the outer layer portion (outer shell) is molded with delicate reinforced plastic, and then the core material is inserted and embedded. It is molded.

[Problems to be solved by the invention]

As described above, in the wood golf club head that is integrally molded with the core inside the head, the core easily cracks due to the processing pressure during molding, and if the crack is large, the head is At the time of molding, the core partly moved in the mold, which sometimes caused uneven thickness of the outer shell made of fiber reinforced plastic, and sometimes the head center of gravity was deviated.

In addition, there is a problem that the embedded core body is easily damaged by impact of a golf ball hit when the golf club is used, and weakening the breaking strength of the core body deteriorates the durability of the club head.

That is, the impact breaking strength of the core greatly affects the durability of the club head, and in order to increase the impact breaking strength of the core, it is easy to increase the specific gravity of the material. But,
Increasing the specific gravity of the material increases the weight of the entire core body, which does not meet the requirement that the core body should be made as large as possible and the weight should be reduced while increasing the impact fracture strength of the core body.

Therefore, conventionally, as a solution to increase the impact fracture strength of the core body, as disclosed in, for example, JP-A-62-170271, the core body and the entire surface or part of the surface portion or inside, the core body and The applicant of the present application has proposed a club head in which at least one layer of cloth made of fibers having heat resistance sufficient to withstand the temperature at which the head is molded is embedded.

[Purpose of device]

This invention was devised in order to further enhance the effect of the invention filed by the applicant of the present application, and without increasing the weight of the whole core body made mainly of syntactic foam as much as possible,
An object of the present invention is to provide a golf club head in which the impact breaking load of the core is increased and the durability of the club head is improved.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention aims to achieve at least the impact load of the core body, that is, the face side of the club head of the core body, or a part or the whole of the face side and the upper layer portion. It is a gist that a core material having a two-layer structure is formed by arranging a similar material having a higher breaking strength and a higher specific gravity than that of the above or a material reinforced by compounding whiskers or short fibers. .

[Function of device]

This invention is configured as described above, and a core having a two-layer structure is provided by arranging a material having a high specific gravity of the same type or a material reinforced by compounding whiskers or short fibers into a composite at least at a position where an impact load acts on the core. By configuring it as a body, it is possible to increase the impact fracture strength of the core and improve the durability of the club head without increasing the weight of the whole core, in other words, the average specific gravity as much as possible, and to increase the size of the club head. Can be designed to be larger than the conventional one, and further, the psychological improvement of the golfer at the time of hitting the ball can be achieved.

[Example of device]

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

FIG. 1 is an overall perspective view of a general wood golf club head 1, and FIG. 2 is a sectional view taken along the line II-II of FIG. 1, wherein the club head 1 is an outer shell mainly made of fiber reinforced plastic. 2 and a core body 3 of syntactic foam or the like made of matrix resin and glassy micro hollow spheres inside the outer shell 2.

Further, 4 is a face portion of the club head 1, and 5 is a sole plate.

As shown in FIG. 3, the core body 3 has a low specific gravity portion 6a made of syntactic foam and the like, and a low specific gravity portion 6a on the face portion 4 side of the club head 1, that is, a portion where an impact load acts. Higher fracture strength than the material of the specific gravity part 6a,
Moreover, the material 6b having a high specific gravity is arranged.

As material 6b with high breaking strength and high specific gravity,
For example, in the same composition as a material such as syntactic foam in which a conventional micro hollow body is compounded with a resin matrix such as an epoxy resin, glass micro hollow spheres are blended in a smaller amount than the conventional one to increase the specific gravity and to break. Use materials with increased strength.

In addition to the face portion 4 side, as shown in FIG. 4, the impact load acts on the face portion and a part or the whole of the upper layer portion 7 thereof, and the low specific gravity portion 6a is superposed on the face portion. The material 6b having high breaking strength and high specific gravity is disposed.

Furthermore, as another embodiment, as shown in FIG.
To embed a reinforcing cloth 8 between the low specific gravity portion 6a of the above and the material 6b having high breaking strength and high breaking strength to further enhance the impact breaking strength of the core body and improve the durability of the club head. It is also possible.

When the wood golf club head 1 is molded using the core body 3 having the two-layer structure configured as described above, as shown in FIG. 6, the sole plate 5 and the sole plate 5 are integrated on the bottom surface side of the core body 3. The recesses 11a and 11b are formed so as to engage with the core support cylinder 9 and the support pin 10 which are formed as a result. And the core support cylinder 9 and the support pin 10 of the sole plate 5
On the core body 3 with the recesses 11a and 11b of the core body 3 engaged,
The outer shell 2 made of fiber reinforced plastic is molded on the surface of the core body 3 and integrally molded.

[Effect of device]

This invention is a golf club head having an outer shell mainly made of fiber reinforced plastic as described above, and integrally embedding a core body made of a material of low specific gravity such as syntactic foam in the inside, Since a material having a high breaking strength and a high specific gravity is disposed at least at a position where an impact load acts on the core, the core has a two-layer structure. Therefore, the weight of the entire core, in other words, the average specific gravity. The impact damage strength of the core can be increased without increasing the club head as much as possible, and the durability of the club head can be improved, and the size of the club head can be designed larger than conventional ones. There is an effect that the psychological improvement of the golfer can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of a general wood golf club head, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIGS. 3 and 4 show the invention. 5 is a sectional view showing each embodiment of the core body, FIG. 5 is a sectional view of a core body in which a reinforcing cloth is embedded in another embodiment of the present invention, and FIG. 6 is a wood golf club head in which the core body of the present invention is embedded. FIG. 1 ... Wood golf club head, 2 ... Outer shell, 3 ...
Core body, 4 ... Face part, 5 ... Sole plate, 6a ...
… Low specific gravity part, 6b …… Material with high breaking strength and high specific gravity,
8 ... Reinforcing cloth.

Claims (1)

[Scope of utility model registration request] 1. A golf club head having an outer shell mainly made of fiber reinforced plastic, and a core body made of a material having a low specific gravity such as syntactic foam is integrally embedded therein. 2. A golf club head having a two-layer structure in which a core material having a high breaking strength and a high specific gravity is disposed at least at a location where an impact load is applied.