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[Summary of the Invention] [Problem to be Solved by the Invention] The present invention has the objective of providing a hollow golf club head capable of enhancing the bonding strength of a metallic outer shell member and an FRP outer shell member, regardless of the kind of the metallic material to be used in the metallic outer shell member.
Hence, with this form of bonding which causes the FRP thread member 22 to strongly connect the FRP outer shell member 21 to the metallic outer shell member 11 at a high bonding strength even if a metallic material used in the metallic outer shell member is not well-adhesive to the FRP outer shell member, it is possible to ensure durability as a golf club head and simultaneously improve the flying distance or other performance of golf clubs based on the combination of different types of materials.
Hence, it is possible to enhance the bonding strength of the metallic outer shell member and the FRP outer shell member even if the metallic material used for the metallic outer shell member is not well-adhesive to the FRP outer shell member.
However, in the case of a hollow head body which is structured by bonding a metallic outer shell member to an FRP outer shell member, there was a drawback that, depending on the metallic material used for the metallic outer shell member, it may be difficult to ensure sufficient bonding strength, thus durability as a golf club head, when only adhesive material is used to bond the FRP outer shell member to the metallic outer shell member.
Claimed Invention (Claim 1 of the Patent) A hollow golf club head, comprising a head body having a hollow structure and formed by coupling together a metallic outer shell member and a fiber reinforced plastic (FRP) outer shell member at their respective bonding portions, wherein; a plurality of through-holes are provided in the bonding portion of the metallic outer shell member; the bonding portion of the metallic outer shell member is bonded to the bonding portion of the FRP outer shell member by interposing an FRP thread member along with adhesive material between the metallic outer shell member and the FRP outer shell member, the FRP thread member maintaining a shape of passing through the plurality of the through-holes and running alternately on inner and outer surfaces of the metallic outer shell member; and each matrix of the FRP outer shell member and the FRP thread member contains epoxy resin.
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