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In the outer shell member, an exhaust chamber which communicates with the at least one introduction hole and which supplies exhaust air from the at least one exhaust port corresponding to the introduction hole to an exhaust pipe, is formed in the longitudinal direction of the flange.
Moreover, the section of the 'Problem to be solved by the invention includes the statement that 'It is an object of the present invention to provide a hollow golf club head that makes it possible to increase the bonding strength of an outer shell member made of metal and outer shell member made of fiber reinforced plastic' ().
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.
For example, US PAT. XXXXX discloses a hollow golf club head comprising a metallic casing (outer shell member) coupled with an FRP cover (outer shell member), wherein the FRP cover comprising epoxy resin as a matrix and a carbon fiber sheet as a reinforcing material is bonded with adhesive material to cover openings on the upper surface of the casing (see Fig.
[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.
The water-cooling jacket is attached to the outer wall of the outer shell member, and has a recess defining a cooling water passage between the outer wall of the outer shell member and the inner wall of the water-cooling jacket.
Further, since the metallic spheres (11) are joined after being placed in the outer shell member (2), the metallic spheres (11) can be reliably filled inside the outer shell member (2) even if it has a complex shape.
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.
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.
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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