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Publication numberUS20060025235 A1
Publication typeApplication
Application numberUS 10/899,157
Publication dateFeb 2, 2006
Filing dateJul 27, 2004
Priority dateJul 27, 2004
Publication number10899157, 899157, US 2006/0025235 A1, US 2006/025235 A1, US 20060025235 A1, US 20060025235A1, US 2006025235 A1, US 2006025235A1, US-A1-20060025235, US-A1-2006025235, US2006/0025235A1, US2006/025235A1, US20060025235 A1, US20060025235A1, US2006025235 A1, US2006025235A1
InventorsNorihiko Nakahara, Yoh Nishizawa, Tomoaki Mori
Original AssigneeThe Yokohama Rubber Co., Ltd.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hollow golf club head
US 20060025235 A1
Abstract
Provided is a hollow golf club head capable of improving repulsion and degree of design freedom compared to the case where a golf club head is formed using only a single metallic material, by combining different kinds of materials as component materials of a face section. The face section of the hollow golf club head is made of a composite material in which metal and fiber-reinforced plastic are combined. For example, in the hollow golf club head comprising a plate member disposed on the face section, the plate member is partially made of fiber-reinforced plastic in a plane direction and the remainder of said plate member is made of metal.
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Claims(19)
1. A hollow golf club head in which a plate member is disposed on a face section, wherein
said plate member is partially made of fiber-reinforced plastic in a plane direction and the remainder of said plate member is made of metal.
2. The hollow golf club head as claimed in claim 1, wherein a peripheral portion of said plate member is made of fiber-reinforced plastic and the remainder of said plate member is made of metal.
3. The hollow golf club head as claimed in claim 1, wherein a center portion of said plate member is made of fiber-reinforced plastic and the remainder of said plate member is made of metal.
4. The hollow golf club head as claimed in claim 1, wherein a peripheral portion and a center portion of said plate member are made of fiber-reinforced plastic and the remainder of said plate member is made of metal.
5. A hollow golf club head in which a plate member is disposed on a face section, wherein
said plate member is made of metal and a reinforcing member made of fiber-reinforced plastic is laminated to the back face of said plate member.
6. The hollow golf club head as claimed in any one of claims 1 to 5, wherein, as said fiber-reinforced plastic, two or more kinds of fiber-reinforced plastics are combined to be used.
7. The hollow golf club head as claimed in any one of claims 1 to 5, wherein an elastic modulus of fiber in said fiber-reinforced plastic is less than 27 ton/mm2.
8. The hollow golf club head as claimed in any one of claims 1 to 5, wherein an elastic modulus of fiber in said fiber-reinforced plastic is 27 ton/mm2 or more.
9. A hollow golf club head in which a plurality of laminated plate members are disposed on a face section and only the peripheral portions of said plate members are bonded to a head body, wherein
at least one of said plate members is made of metal and the other members are made of fiber-reinforced plastic.
10. A hollow golf club head in which a plurality of laminated plate members are disposed on a face section and only the peripheral portions of said plate members are bonded to a head body, wherein
at least one of said plate members is partially made of fiber-reinforced plastic in a plane direction and the remainder of said plate members is made of metal.
11. The hollow golf club head as claimed in claim 10, wherein the peripheral portions of said plate members are made of fiber-reinforced plastic and the remainder of said plate members is made of metal.
12. The hollow golf club head as claimed in claim 10, wherein a center portions of said plate members are made of fiber-reinforced plastic and the remainder of said plate members is made of metal.
13. The hollow golf club head as claimed in claim 10, wherein the peripheral portions and center portions of said plate members are made of fiber-reinforced plastic and the remainder of said plate members is made of metal.
14. A hollow golf club head in which a plurality of laminated plate members are disposed on a face section and only the peripheral portions of said plate members are bonded to a head body, wherein
said plurality of plate members are made of metal and a reinforcing member made of fiber-reinforced plastic is laminated to an opposing face of said plate members.
15. A hollow golf club head in which a plurality of laminated plate members are disposed on a face section and only the peripheral portions of said plate members are bonded to a head body, wherein
said plurality of plate members are made of metal and a spacer made of fiber-reinforced plastic is interposed between the peripheral portions of said plate members.
16. The hollow golf club head as claimed in any one of claims 9 to 15, wherein, as said metal, two or more kinds of metals are combined to be used.
17. The hollow golf club head as claimed in any one of claims 9 to 15, wherein, as said fiber-reinforced plastic, two or more kinds of fiber-reinforced plastics are combined to be used.
18. The hollow golf club head as claimed in any one of claims 9 to 15, wherein an elastic modulus of fiber in said fiber-reinforced plastic is less than 27 ton/mm2.
19. The hollow golf club head as claimed in any one of claims 9 to 15, wherein an elastic modulus of fiber in said fiber-reinforced plastic is 27 ton/mm2 or more.
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    1. Field of the Invention
  • [0002]
    The present invention relates to a golf club head having a hollow structure and, more specifically, to a hollow golf club head in which repulsion and degree of design freedom are improved compared to the case where the golf club head is formed using only a single metallic material, by combining different kinds of materials as component materials of the face section.
  • [0003]
    2. Description of the Related Art
  • [0004]
    In a metallic hollow golf club head, in general, a large weight proportion is placed in the sole section in order to keep the center of gravity low. However, recently, it has been required to increase the head volume as much as possible within a limited mass of the head. Thus, the margin of the weight for keeping the center of gravity low becomes small and the varsity of the possible form features becomes limited. Therefore, the center of gravity of the head cannot be maintained sufficiently low or deep. Further, in the conventional hollow golf club head, the repulsion of the face surface cannot be utilized to maximum.
  • [0005]
    Japanese Patent No. 2764883, Japanese Patent Laid-Open No. 2000-229135, and Japanese Patent No. 2773009 disclose a golf club head formed by using a composite material in which different kinds of materials are combined. However, in the golf club head formed by using the material in which properties of the different kinds of materials are combined, the varsity of the possible form features and the repulsion are still insufficient.
  • [0006]
    Also, Japanese Patent No. 3007840 discloses a hollow golf club head in which several plate members are laminated to be disposed on the face section and only peripheral portions of the plate members are bonded to a head body. In the hollow golf club head, plate members can mutually slide to allow displacement. Thus, by reducing the thickness of each plate member, it is possible to increase the deflection amount and improve repulsion while maintaining the strength based on the overall thickness of a plurality of plate members. However, in the golf club head in which pluralities of the plate members are laminated to be disposed on the face section, the weight is increased, so that the weight margin is decreased and the varsity of the possible form features becomes limited. Thus, it is difficult to keep the center of gravity low or deep. The repulsion of the head is also insufficient.
  • SUMMARY OF THE INVENTION
  • [0007]
    An object of the present invention is to provide a hollow golf club head capable of improving repulsion and degree of design freedom compared to the case where the golf club head is formed using only a single metallic material, by combining different kinds of materials as component materials of the face section.
  • [0008]
    In order to achieve the foregoing object, the hollow golf club head of the present invention in which a plate member is disposed on the face section is characterized in that the plate member is partially made of fiber-reinforced plastic in a plane direction and the remainder of the plate member is made of metal. More specifically, at least either the peripheral portion or the center portion is made of fiber-reinforced plastic over the entire thickness and the remainder of the plate member is made of metal.
  • [0009]
    Further, in order to achieve the foregoing object, the hollow golf club head of the present invention in which a plate member is disposed on the face section is characterized in that the plate member is made of metal and a reinforcing member made of fiber-reinforced plastic is laminated to the back face of the plate member.
  • [0010]
    As described, metal and fiber-reinforced plastic are combined as the component material of the face section so that weight of the face section can be reduced and a larger weight margin can be obtained. Accordingly, compared to the case where the face section is formed using only a single kind of metal, the degree of design freedom can be improved. As a result, the center of gravity of the head can be lowered and deepened. Also, by specifying the area to which the metal and the fiber-reinforced plastic are applied as described above, it enables to improve the repulsion of the head.
  • [0011]
    Further, in order to achieve the foregoing object, the hollow golf club head of the present invention in which several laminated plate members are disposed on the face section and only the peripheral portions of the plate members are bonded to a head body is characterized in that at least one of the plate members is made of metal and the other members are made of fiber-reinforced plastic.
  • [0012]
    Furthermore, in order to achieve the foregoing object, the hollow golf club head of the present invention in which several laminated plate members are disposed on the face section and only the peripheral portions of the plate members are bonded to the head body is characterized in that at least one of the plate members is partially made of fiber-reinforced plastic in a plane direction and the remainder of the plate members is made of metal. More specifically, at least either the peripheral portions or the center portions of the plate members are made of fiber-reinforced plastic over the entire thickness and the remainder of said plate members is made of metal.
  • [0013]
    Further, in order to achieve the foregoing object, the hollow golf club head of the present invention in which a plurality of laminated plate members are disposed on the face section and only the peripheral portions of the plate members are bonded to a head body is characterized in that the plurality of the plate members are made of metal and a reinforcing member made of fiber-reinforced plastic is laminated to an opposing face of the plate members.
  • [0014]
    Furthermore, in order to achieve the foregoing object, the hollow golf club head of the present invention in which a plurality of laminated plate members are disposed on the face section and only the peripheral portions of the plate members are bonded to a head body is characterized in that the plurality of the plate members are made of metal and a spacer made of fiber-reinforced plastic is interposed between the peripheral portions of the plate members.
  • [0015]
    In the hollow golf club head in which a plurality of laminated plate members are disposed on the face section, metal and fiber-reinforced plastic are combined as the component material of the face section, so that weight of the face section can be reduced and a larger weight margin can be obtained. Accordingly, compared to the case where the face section is formed using only a single kind of metal, the degree of design freedom can be improved. As a result, the center of gravity of the head can be lowered and deepened. Also, the plurality of the plate members can be slid to be displaced from each other. Thus, by reducing the thickness of each plate member, it is possible to increase the deflection amount of the face section and improve the repulsion while maintaining the strength based on the overall thickness of a plurality of plate members.
  • [0016]
    As for the metal to be used, two or more kinds of metals can be combined. As for the fiber-reinforced plastic to be used, two or more kinds of fiber-reinforced plastics can be combined. As the fiber-reinforced plastic, the one with the fiber having an elastic modulus of less than 27 ton/mm2 or the one with the fiber having an elastic modulus of 27 ton/mm2 or more can be appropriately selected according to the position of the face section so as to increase the rigidity in the peripheral portion of the face section than that of the center portion of the face section. Thereby, the face section can be easily deflected, so that the repulsion can be further improved.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0017]
    FIGS. 1(a) to 1(c) show a golf club head according to the first embodiment of the present invention, in which FIG. 1(a) is a plan view, FIG. 1(b) is a front view, and FIG. 1(c) is a cross section taken along the line I-I;
  • [0018]
    FIGS. 2(a) to 2(c) show a golf club head according to a second embodiment of the present invention, in which FIG. 2(a) is a plan view, FIG. 2(b) is a front view, and FIG. 2(c) is a cross section taken along the line II-II;
  • [0019]
    FIGS. 3(a) to 3(c) show a golf club head according to a third embodiment of the present invention, in which FIG. 3(a) is a plan view, FIG. 3(b) is a front view, and FIG. 3(c) is a cross section taken along the line III-III;
  • [0020]
    FIGS. 4(a) to 4(c) show a golf club head according to a fourth embodiment of the present invention, in which FIG. 4(a) is a plan view, FIG. 4(b) is a front view, and FIG. 4(c) is a cross section taken along the line IV-IV;
  • [0021]
    FIGS. 5(a) to 5(c) show a golf club head according to a fifth embodiment of the present invention, in which FIG. 5(a) is a plan view, FIG. 5(b) is a front view, and FIG. 5(c) is a cross section taken along the line V-V;
  • [0022]
    FIGS. 6(a) to 6(c) show a golf club head according to a sixth embodiment of the present invention, in which FIG. 6(a) is a plan view, FIG. 6(b) is a front view, and FIG. 6(c) is a cross section taken along the line VI-VI;
  • [0023]
    FIGS. 7(a) to 7(c) show a golf club head according to a seventh embodiment of the present invention, in which FIG. 7(a) is a plan view, FIG. 7(b) is a front view, and FIG. 7(c) is a cross section taken along the line VII-VII;
  • [0024]
    FIGS. 8(a) to 8(c) show a golf club head according to en eighth embodiment of the present invention, in which FIG. 8(a) is a plan view, FIG. 8(b) is a front view, and FIG. 8(c) is a cross section taken along the line VIII-VIII;
  • [0025]
    FIGS. 9(a) to 9(c) show a golf club head according to a ninth embodiment of the present invention, in which FIG. 9(a) is a plan view, FIG. 9(b) is a front view, and FIG. 9(c) is a cross section taken along the line IX-IX;
  • [0026]
    FIGS. 10(a) to 10(c) show a golf club head according to a tenth embodiment of the present invention, in which FIG. 10(a) is a plan view, FIG. 10(b) is a front view, and FIG. 10(c) is a cross section taken along the line X-X; and
  • [0027]
    FIGS. 11(a) to 11(c) show a golf club head according to an eleventh embodiment of the present invention, in which FIG. 11(a) is a plan view, FIG. 11(b) is a front view, and FIG. 11(c) is a cross section taken along the line XI-XI;
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • [0028]
    Referring to the appended drawings, the configuration of the present invention will be described in detail below.
  • [0029]
    FIGS. 1(a) to 1(c) show the golf club head according to the first embodiment of the present invention. As shown in FIGS. 1(a) to 1(c), the golf club head according to the present embodiment has a hollow structure, and a plate member 2 is disposed on the face section of a head body 1 thereof. A peripheral portion 2 a of the plate member 2 is made of fiber-reinforced plastic, and the remainder is made of metal as the other section of the head body 1 than the face section. In this case, the fiber-reinforced plastic with the elastic modulus of fiber of less than 27 ton/mm2 is used for the peripheral portion 2 a of the plate member 2. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively.
  • [0030]
    FIGS. 2(a) to 2(c) show the golf club head according to the second embodiment of the present invention. As shown in FIGS. 2(a) to 2(c), the golf clu b head according to the present embodiment has a hollow structure, and a plate member 2 is disposed on the face section of a head body 1 thereof. A center portion 2 b of the plate member 2 is made of fiber-reinforced plastic, and the remainder is made of metal as the other section of the head body 1 than the face section. In this case, the fiber-reinforced plastic with the elastic modulus of fiber of 27 ton/mm2 or more is used for the center portion 2 b of the plate member 2. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively.
  • [0031]
    FIGS. 3(a) to 3(c) show the golf club head according to the third embodiment of the present invention. As shown in FIGS. 3(a) to 3(c), the golf club head according to the present embodiment has a hollow structure, and a plate member 2 is disposed on the face section of a head body 1 thereof A peripheral portion 2 a and a center portion 2 b of the plate member 2 are made of fiber-reinforced plastic, and the remainder is made of metal as the other section of the head body 1 than the face section. In this case, the fiber-reinforced plastic with the elastic modulus of fiber of less than 27 ton/mm2 is used for the peripheral portion 2 a of the plate member 2, while the fiber-reinforced plastic with the elastic modulus of fiber of 27 ton/mm2 or more is used for the center portion 2 b of the plate member 2. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively.
  • [0032]
    FIGS. 4(a) to 4(c) show the golf club head according to the fourth embodiment of the present invention. As shown in FIGS. 4(a) to 4(c), the golf club head according to the present embodiment has a hollow structure, and a plate member 2 is disposed on the face section of a head body 1 thereof. The plate member 2 is made of metal as the other section of the head body 1 than the face section, and a reinforcing member 3, which is made of fiber-reinforced plastic, is laminated to the back face thereof. Furthermore, the thickness of the plate member 2 is reduced compared to the conventional case with the addition of the reinforcing member 3. In this case, the thickness of the reinforcing member 3 is increased gradually from the peripheral portion side of the face section towards the center thereof. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively.
  • [0033]
    In the first to fourth embodiments described above, the face section of the head body 1 is made of composite material of metal and fiber-reinforced plastic. Thus, the mass of the face section can be lightened and a larger weight margin can be obtained. Accordingly, compared to the case where the face section is formed using only a single kind of metal, the degree of design freedom can be improved. As a result, the center of gravity of the head can be lowered and deepened. Furthermore, by appropriately selecting the properties of the fiber-reinforced plastic, the center and the peripheral portion of the face section are provided with high rigidity and low rigidity respectively. Thereby, the face section can be easily deflected and the repulsion can be further improved.
  • [0034]
    The fiber-reinforced plastic mentioned above includes those obtained by impregnating matrix resin such as epoxy resin, unsaturated polyester resin, vinyl ester resin or the like with reinforcing fiber such as carbon fiber, glass fiber, aramid fiber or the like. The fiber-reinforced plastic that uses carbon fiber as the reinforcing fiber is especially preferable. Further, titanium alloy, aluminum alloy, stainless steel or the like can be used alone or in combination for the metal mentioned above.
  • [0035]
    FIGS. 5(a) to 5(c) show the golf club head according to the fifth embodiment of the present invention. As shown in FIGS. 5(a) to 5(c), the golf club head according to the present embodiment has a hollow structure, and several plate members 2, 2 are laminated and disposed on the face section of a head body 1 thereof. Only the peripheral portions of the plate members 2, 2 are unified with the head body 1. The outer plate member 2 is made of metal as the other section of the head body 1 than the face section, and the inner plate member 2 is made of fiber-reinforced plastic. In this case, the thickness of the plate member 2, which is made of fiber-reinforced plastic, is increased gradually from the peripheral portion side of the face section towards the center thereof. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively.
  • [0036]
    FIGS. 6(a) to 6(c) show the golf club head according to the sixth embodiment of the present invention. As shown in FIGS. 6(a) to 6(c), the golf club head according to the present embodiment has a hollow structure, and several plate members 2, 2 are laminated and disposed on the face section of a head body 1 thereof. Only the peripheral portions of the plate members 2, 2 are unified with the head body 1. The peripheral portion 2 a of each plate member 2 is made of the fiber-reinforced plastic, and the remainder is made of metal as the other section of the head body 1 than the face section. In this case, the fiber-reinforced plastic with the elastic modulus of fiber of less than 27 ton/mm2 is used for the peripheral portion 2 a of the plate member 2. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively.
  • [0037]
    FIGS. 7(a) to 7(c) show the golf club head according to the seventh embodiment of the present invention. As shown in FIGS. 7(a) to 7(c), the golf club head according to the present embodiment has a hollow structure, and several plate members 2, 2 are laminated and disposed on the face section of a head body 1 thereof. Only the peripheral portions of the plate members 2, 2 are unified with the head body 1. The center portion 2 b of each plate member 2 is made of the fiber-reinforced plastic, and the remainder is made of metal as the other section of the head body 1 than the face section. In this case, the fiber-reinforced plastic with the elastic modulus of fiber of 27 ton/mm2 or more is used for the center portion 2 b of the plate member 2. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively.
  • [0038]
    FIGS. 8(a) to 8(c) show the golf club head according to the eighth embodiment of the present invention. As shown in FIGS. 8(a) to 8(c), the golf club head according to the present embodiment has a hollow structure, and several plate members 2, 2 are laminated and disposed on the face section of a head body 1 thereof. Only the peripheral portions of the plate members 2, 2 are unified with the head body 1. A peripheral portion 2 a and a center portion 2 b of the plate member 2 are made of fiber-reinforced plastic, and the remainder is made of metal as the other section of the head body 1 than the face section. In this case, the fiber-reinforced plastic with the elastic modulus of fiber of less than 27 ton/mm2 is used for the peripheral portion 2 a of the plate member 2, and the fiber-reinforced plastic with the elastic modulus of fiber of 27 ton/mm2 or more is used for the center portion 2 b of the plate member 2. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively.
  • [0039]
    FIGS. 9(a) to 9(c) show the golf club head according to the ninth embodiment of the present invention. As shown in FIGS. 9(a) to 9(c), the golf club head according to the present embodiment has a hollow structure, and several plate members 2, 2 are laminated and disposed on the face section of a head body 1 thereof. Only the peripheral portions of the plate members 2, 2 are unified with the head body 1. The plate members 2, 2 are made of metal as the other section of the head body 1 than the face section, and a reinforcing member 3, which is made of fiber-reinforced plastic, is laminated to the opposing back thereof. In this case, the thickness of the reinforcing member 3 is increased gradually from the peripheral portion side of the face section towards the center. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively. Furthermore, the thickness of the plate member 2 is reduced compared to the conventional case with the addition of the reinforcing member 3.
  • [0040]
    FIGS. 10(a) to 10(c) show the golf club head according to the tenth embodiment of the present invention. As shown in FIGS. 10(a) to 10(c), the golf club head according to the present embodiment has a hollow structure, and several plate members 2, 2 are laminated and disposed on the face section of a head body 1 thereof. Only the peripheral portions of the plate members 2, 2 are unified with the head body 1. The plate members 2, 2 are made of metal as the other section of the head body 1 than the face portion, and a spacer 4, which is made of fiber-reinforced plastic, is inserted between the peripheral portions of the plate members. In other words, the metal spacer that is conventionally inserted between the peripheral portions of several plate members is replaced with the fiber-reinforced plastic spacer in the present embodiment.
  • [0041]
    FIGS. 11(a) to 11(c) show the golf club head according to the eleventh embodiment of the present invention. As shown in FIGS. 11(a) to 11(c), the golf club head according to the present embodiment has a hollow structure, and several plate members 2, 2 are laminated and disposed on the face section of a head body 1 thereof. Only the peripheral portions of the plate members 2, 2 are unified with the head body 1. The center portion 2 b of each plate member 2 is made of fiber-reinforced plastic, and the remainder is made of metal as the other section of the head body 1 than the face section. In this case, the fiber-reinforced plastic with the elastic modulus of fiber of 27 ton/mm2 or more is used for the center portion 2 b of the plate member 2. As a result, the center and the peripheral portion of the face section have high rigidity and low rigidity respectively. Furthermore, a spacer 4, which is made of fiber-reinforced plastic, is inserted between the peripheral portions of the plate members 2, 2.
  • [0042]
    In the fifth to eleventh embodiments described above, the face section of the head body 1 is made of composite material of metal and fiber-reinforced plastic. Thus, the mass of the face section can be lightened and a larger weight margin can be obtained. Accordingly, compared to the case where the face section is formed using only a single kind of metal, the degree of design freedom can be improved. As a result, the center of gravity of the head can be lowered and deepened. Furthermore, by appropriately selecting the properties of the fiber-reinforced plastic, the center and the peripheral portion of the face section are provided with high rigidity and low rigidity respectively. Thereby, the face section can be easily deflected and the repulsion can be further improved.
  • [0043]
    Furthermore, in the fifth to eleventh embodiments described above, a plurality of the plate members 2, 2 can be slid and displaced from each other by collision of the face section of the head body 1 and a ball, causing the deflection of these plate members 2, 2. In such a case, the break strength of the face section is proportional to the overall thickness (including the reinforcing member 3) of a plurality of the plate members 2, 2, realizing the setup of a sufficient strength based on the overall thickness thereof. Meanwhile, the deflection amount of the face section increases as each of the plate members 2, 2 becomes thinner. Thus, when the face section comprises the lamination of several plate members 2, 2 as described above, the repulsion can be improved while maintaining the sufficient strength. Therefore, it is possible to achieve a notable improvement in the repulsion due to multiplier effect together with the effect of improving the repulsion by using the composite material.
  • [0044]
    The fiber-reinforced plastic mentioned above includes those obtained by impregnating matrix resin such as epoxy resin, unsaturated polyester resin, vinyl ester resin or the like with reinforcing fiber such as carbon fiber, glass fiber, aramid fiber or the like. The fiber-reinforced plastic that uses carbon fiber as the reinforcing fiber is especially preferable. Further, titanium alloy, aluminum alloy, stainless steel or the like can be used alone or in combination for the metal mentioned above.
  • [0045]
    The preferred embodiments of the present invention are described above in detail; however, it should be understood that various modifications, replacements, and displacements may be made therein, as long as such modifications, replacements, and displacements fall within the true spirit and the scope of the present invention covered by the appended claims.
  • EXAMPLES
  • [0046]
    First, an experiment regarding the first to fourth embodiments was carried out. The hollow golf club heads of comparative examples 1, 2 (conventional ones) in which the face sections were made of a single metallic material and that of examples 1 to 4 in which the face sections were made of a composite material of metal and fiber-reinforced plastic were fabricated, respectively. In table 1, “FRP” means the fiber-reinforced plastic, “below 27t” means that the fiber elasticity modulus is less than 27 ton/mm2, and “above 27t” means that the fiber elasticity modulus is 27 ton/mm2 or more.
  • [0047]
    The restitution coefficient and the degree of design freedom of the golf club heads were evaluated. The results are shown in table 1. The results of the evaluation are shown with the comparative example 1 being the index as 100. A larger index value of the restitution coefficient means the increased initial ball speed and the increased carry. The degree of design freedom is the weight margin when the overall mass of the head is constant and a larger index value of the varsity means a larger weight margin.
    TABLE 1
    Material of
    Material of plate member of face section reinforcing
    Center Peripheral Remainder member of Thickness of face Repulsion Degree of
    Figure portion portion portion face section section coefficient design freedom
    Comparative Titanium Titanium Titanium Uniform 100 100
    example 1 alloy alloy alloy
    Comparative Titanium Titanium Titanium Center -thick 105 106
    example 2 alloy alloy alloy Peripheral -thin
    Example 1 FRP Titanium Titanium Uniform 107 110
    (above 27t) alloy alloy
    Example 2 Titanium Titanium Titanium FRP Center-thick 109 115
    alloy alloy alloy (above 27t) Peripheral-thin
    Example 3 FRP FRP Titanium Uniform 111 119
    (above 27t) (below 27t) alloy
    Example 4 FRP FRP Titanium Center-thick 115 122
    (above 27t) (below 27t) alloy Peripheral-thin
  • [0048]
    As can be seen from table 1, all of the golf club heads of examples 1 to 4 exhibited a larger degree of design freedom and the restitution coefficient compared to comparative examples 1, 2.
  • [0049]
    Next, an experiment regarding the fifth to eleventh embodiments was carried out. The hollow golf club head of comparative examples 11 (conventional one) in which the face section was made of a single metallic material and that of examples 11 to 17 in which the face sections were made of a composite material of metal and fiber-reinforced plastic were fabricated, respectively. In table 2, “SUS alloy” means stainless steel, “FRP” means the fiber-reinforced plastic, “below 27t” means that the fiber elasticity modulus is less than 27 ton/mm2, and “above 27t” means that the fiber elasticity modulus is 27 ton/mm2 or more.
  • [0050]
    The restitution coefficient and the degree of design freedom of the golf club heads were evaluated. The results are shown in table 2. The results of the evaluation are shown with the comparative example 11 being the index as 100. A larger index value of the restitution coefficient means the increased initial ball speed and the increased carry. The degree of design freedom is the weight margin when the overall mass of the head is constant and a larger index value of the varsity means a larger weight margin.
    TABLE 2
    Materi- Degree
    Material of outer plate member of face Material of inner plate member of face Material of al of Repul- of
    section section reinforcing spacer sion design
    Center Peripheral Remainder Center Peripheral Remainder member of of face coeffi- free-
    Figure portion portion portion portion portion portion face section section cient dom
    Comparative Titanium Titanium Titanium Titanium Titanium Titanium Titanium 100 100
    example 11 alloy alloy alloy alloy alloy alloy alloy
    Example 11 Titanium Titanium Titanium FRP FRP FRP 103 118
    alloy alloy alloy (above27t) (below27t) (below27)
    Example 12 Titanium Titanium Titanium Titanium Titanium Titanium FRP 104 102
    alloy alloy alloy alloy alloy alloy (above27t)
    Example 13 FRP Titanium Titanium FRP Titanium Titanium 106 105
    (above27t) alloy alloy (above27t) alloy alloy
    Example 14 Titanium FRP Titanium Titanium FRP Titanium 105 103
    alloy (below27t) alloy alloy (below27t) alloy
    Example 15 FRP FRP Titanium FRP FRP Titanium 108 106
    (above27t) (below27t) alloy (above27t) (below27t) alloy
    Example 16 Titanium Titanium Titanium Titanium Titanium Titanium FRP (be- 109 103
    alloy alloy alloy alloy alloy alloy low27t)
    Example 17 FRP Titanium Titanium FRP SUS alloy SUS alloy FRP (be- 110 106
    (above27t) alloy alloy (above27t) low27t)
  • [0051]
    As can be seen from table 2, all of the golf club head of examples 11 to 17 exhibited a larger degree of design freedom and the restitution coefficient compared to the comparative example 11.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4792139 *Aug 15, 1986Dec 20, 1988Yamaha CorporationGolf club head
US4884812 *Oct 11, 1988Dec 5, 1989Yamaha CorporationGolf club head
US4964640 *Jan 30, 1990Oct 23, 1990Yamaha CorporationIron club head for golf
US5403007 *Jan 5, 1994Apr 4, 1995Chen; Archer C. C.Golf club head of compound material
US5467983 *Aug 23, 1994Nov 21, 1995Chen; Archer C. C.Golf wooden club head
US5524331 *Aug 23, 1994Jun 11, 1996Odyssey Sports, Inc.Method for manufacturing golf club head with integral inserts
US6743117 *Sep 13, 2002Jun 1, 2004Acushnet CompanyGolf club head with face inserts
US6805643 *Aug 18, 2003Oct 19, 2004O-Ta Precision Casting Co., Ltd.Composite golf club head
US6875124 *Jun 2, 2003Apr 5, 2005Acushnet CompanyGolf club iron
US20030134692 *Dec 27, 2002Jul 17, 2003The Yokohama Rubber Co., Ltd.Hollow golf club head
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7811179Dec 20, 2007Oct 12, 2010Cobra Golf, Inc.Multi-metal golf clubs
US7811180Sep 25, 2006Oct 12, 2010Cobra Golf, Inc.Multi-metal golf clubs
US7819757 *Oct 26, 2010Cobra Golf, Inc.Multi-material golf club head
US7922604Apr 12, 2011Cobra Golf IncorporatedMulti-material golf club head
US8491412Feb 7, 2011Jul 23, 2013Cobra Golf IncorporatedMulti-material golf club head
US8616997Oct 11, 2010Dec 31, 2013Cobra Golf IncorporatedMulti-metal golf clubs
US8870682Apr 14, 2010Oct 28, 2014Cobra Golf IncorporatedMulti-material golf club head
US20080058119 *Aug 30, 2007Mar 6, 2008Soracco Peter LMulti-material golf club head
US20080076597 *Sep 25, 2006Mar 27, 2008Roach Ryan LMulti-metal golf clubs
US20080096690 *Dec 20, 2007Apr 24, 2008Acushnet CompanyMulti-metal golf clubs
US20090118037 *Jul 3, 2007May 7, 2009Roach Ryan LMulti-material golf club head
US20100261540 *Oct 14, 2010Cobra Golf, IncorporatedMulti-material golf club head
US20110118057 *May 19, 2011Cobra Golf IncorporatedMulti-metal golf clubs
Classifications
U.S. Classification473/342, 473/345, 473/349
International ClassificationA63B53/04
Cooperative ClassificationA63B2053/0416, A63B2053/045, A63B53/0466, A63B2209/02, A63B2053/042, A63B2053/0462, A63B2053/0454, A63B2053/0425
European ClassificationA63B53/04L
Legal Events
DateCodeEventDescription
Jul 27, 2004ASAssignment
Owner name: THE YOKOHAMA RUBBER CO., LTD., JAPAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAKAHARA, NORIHIKO;NISHIZAWA, YOH;MORI, TOMOAKI;REEL/FRAME:015628/0888
Effective date: 20040713