Multiple Material Golf Club Head

Abstract

A golf club (40) having a club head (42) with a face component (60) and an aft body (61) is disclosed herein. The face component (60) has a striking plate portion (72) and a return portion (74). The aft-body (61) is composed of a crown portion (62), a sole portion (64) and optionally a ribbon section (90). The face component (60) is composed of a metal material, and the aft-body (61) is composed of a non-metal material such as a composite material or a thermoplastic material. The striking plate portion (72) preferably has an aspect ratio less than 1.7. The striking plate portion (72) preferably has concentric regions of thickness with the thickness portion in the center (102). The club head (42) has a volume in the range of 290 cubic centimeters to 600 cubic centimeters, a weight in the range of 165 grams to 300 grams, and a striking plate portion (72) surface area in the range of 4.00 square inches to 7.50 square inches. The golf club head (42) has a coefficient of restitution greater than 0.81 under test conditions such as the USGA test conditions specified pursuant to Rule 4-1e, Appendix II, of the Rules of Golf for 1998-1999.

Description

Summary of Invention

[0036] One aspect of the present invention is a golf club head composed of a metal face component and light-weight aft body, and having a coefficient of restitution of at least 0.81 under test conditions, such as those specified by the USGA. The standard USGA conditions for measuring the coefficient of restitution is set forth in the USGA Procedure for Measuring the Velocity Ratio of a Club Head for Conformance to Rule 4-1e, Appendix II. Revision I, August 4,1998 and Revision 0, July 6, 1998, available from the USGA.

[0037] Yet another aspect of the present invention is a golf club head including a face component composed of a metal material and an aft-body composed of a non-metal material. The face component has a striking plate portion and a return portion. The striking plate portion has a thickness in the range of 0.010 inch to 0.250 inch. The return portion has a thickness in the range of 0.010 inch to 0.200 inch. The aft body has a crown portion, a sole portion and a ribbon portion. The aft-body is attached to the return portion of the face component. The golf club head has a coefficient of restitution of 0.81 to 0.94.

[0038] Yet another aspect of the present invention is golf club head including a face component composed of a metal material and an aft-body composed of a plurality of plies of pre-preg. The face component has a striking plate portion and a return portion. The aft body has a crown portion, a sole portion and a ribbon portion. The aft-body is attached to the return portion of the face component. The moment of inertia of the golf club head about the Izz axis through the center of gravity is greater than 3000 grams- centimeter squared, and the moment of inertia about the Iyy axis through the center of gravity is greater than 1800 grams- centimeter squared.

[0039] Having briefly described the present invention, the above and further objects, features and advantages thereof will be recognized by those skilled in the pertinent art from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Brief Description of Drawings

[0040] FIG. 1 is a front view of a golf club.

[0041] FIG. 1A is a front view of a golf club illustrating the measurement for the aspect ratio.

[0042] FIG. 2 is a rear view of a golf club head.

[0043] FIG. 3 is toe side view of the golf club head of FIG. 2.

[0044] FIG. 4 is a heel side plan view of the golf club head of FIG. 2.

[0045] FIG. 5 is a top plan view of the golf club head of FIG. 2.

[0046] FIG. 6 is a bottom view of the golf club head of FIG. 2.

[0047] FIG. 6A is a bottom perspective view of the golf club head of FIG 2.

[0048] FIG. 7 is a cross-sectional view along line 7-7 of FIG. 5.

[0049] FIG. 8 is an isolated cross-sectional view of the face component overlapping the aft body.

[0050] FIG. 9 is a heel side plan view of a golf club of the present invention illustrating the Z axis and X axis.

[0051] FIG. 10 is a front plan view of a golf club of the present invention illustrating the Z axis and Y axis.

[0052] FIG. 11 is a front plan view of a golf club illustrating the test frame coordinates XT and YT and transformed head frame coordinates YH and ZH.

[0053] FIG. 11A is a toe end view of the golf club illustrating the test frame coordinate ZT and transformed head frame coordinates XH and ZH.

[0054] FIG. 12 is an isolated rear perspective view of a face component of the golf club.

[0055] FIG. 13 is an isolated front view of a face component of the golf club head.

[0056] FIG. 13A is an interior view of the face component of FIG. 13.

[0057] FIG. 13B is a bottom plan view of the face component of FIG. 13.

[0058] FIG. 13C is a top plan view of the face component of FIG. 13.

[0059] FIG. 13D is a toe side view of the face component of FIG. 13.

[0060] FIG. 13E is a heel side view of the face component of FIG. 13.

[0061] FIG. 14 is an isolated top plan view of an aft-body of the golf club head.

[0062] FIG. 14A is an interior view of the aft-body of FIG. 14.

[0063] FIG. 14B is a heel side view of the aft-body of FIG. 14.

[0064] FIG. 14C is a toe side view of the aft-body of FIG. 14.

[0065] FIG. 14D is a bottom plan view of the aft-body of FIG. 14.

[0066] FIG. 14E is a rear view of the aft-body of FIG. 14.

[0067] FIG. 14F is a bottom perspective view of the aft-body of FIG. 14.

Detailed Description

[0068] As shown in FIGS. 1-5, a golf club is generally designated 40. The golf club 40 has a golf club head 42 with a hollow interior, not shown. Engaging the club head 42 is a shaft 48 that has a grip 50, not shown, at a butt end 52 and is inserted into a hosel 54 at a tip end 56.

[0069] The club head 42 is generally composed of two components, a face component 60, and an aft-body 61. The aft-body 61 has a crown portion 62 and a sole portion 64. The club head 42 is preferably partitioned into a heel section 66 nearest the shaft 48, a toe section 68 opposite the heel section 66, and a rear section 70 opposite the face component 60. A sole weighting member 133 is disposed within a sole undercut portion 133a of the sole portion. The sole weighing member has a mass ranging from 0.5 grams to 15 grams.

[0070] The face component 60 is generally composed of a single piece of metal, and is preferably composed of a forged metal material. More preferably, the forged metal material is a forged titanium material. Such titanium materials include pure titanium and titanium alloys such as 6-4 titanium alloy, SP-700 titanium alloy (available from Nippon Steel of Tokyo, Japan), DAT 55G titanium alloy available from Diado Steel of Tokyo, Japan, Ti 10-2-3 Beta-C titanium alloy available from RTI International Metals of Ohio, and the like. Other metals for the face component 60 include stainless steel, other high strength steel alloy metals and amorphous metals. Alternatively, the face component 60 is manufactured through casting, forming, machining, powdered metal forming, metal-injection-molding, electro chemical milling, and the like.

[0071] FIGS. 12, 13, 13A, 13B, 13C, 13D and 13E illustrate the face component 60 in isolation. The face component 60 generally includes a striking plate portion (also referred to herein as a face plate) 72 and a return portion 74 extending laterally inward from the perimeter of the striking plate portion 72. The striking plate portion 72 typically has a plurality of scorelines 75 thereon.

[0072] In a preferred embodiment, the return portion 74 generally includes an upper lateral section 76, a lower lateral section 78 with a sole extension 95, a heel lateral section 80 and a toe lateral section 82. Thus, the return 74 preferably encircles the striking plate portion 72 a full 360 degrees. However, those skilled in the pertinent art will recognize that the return portion 74 may only encompass a partial section of the striking plate portion 72, such as 270 degrees or 180 degrees, and may also be discontinuous.

[0073] The upper lateral section 76 extends inward, towards the aft-body 61, a predetermined distance, d, to engage the crown 62. In a preferred embodiment, the predetermined distance ranges from 0.2 inch to 1.0 inch, more preferably 0.40 inch to 0.75 inch, and most preferably 0.68 inch, as measured from the perimeter 73 of the striking plate portion 72 to the rearward edge of the upper lateral section 76. In a preferred embodiment, the upper lateral section 76 has a general curvature from the heel section 66 to the toe section 68. The upper lateral section 76 has a length from the perimeter 73 of the striking plate section 72 that is preferably a minimal length near the center of the striking plate section 72, and increases toward the toe section 68 and the heel section 66.

[0074] The perimeter 73 of the striking plate portion 74 is defined as the transition point where the face component 60 transitions from a plane substantially parallel to the striking plate portion 72 to a plane substantially perpendicular to the striking plate portion 72. Alternatively, one method for determining the transition point is to take a plane parallel to the striking plate portion 72 and a plane perpendicular to the striking plate portion, and then take a plane at an angle of forty-five degrees to the parallel plane and the perpendicular plane. Where the forty-five degrees plane contacts the face component is the transition point thereby defining the perimeter of the striking plate portion 72.

[0075] The present invention preferably has the face component 60 engage the crown 62 along a substantially horizontal plane. The crown 62 has a crown undercut portion 62a, which is placed under the return portion 74. Such an engagement enhances the flexibility of the striking plate portion 72 allowing for a greater coefficient of restitution. The crown 62 and the upper lateral section 76 are attached to each other as further explained below.

[0076] The heel lateral section 80 is substantially perpendicular to the striking plate portion 72, and the heel lateral section 80 covers the hosel 54 before engaging an optional ribbon section 90 and a bottom section 91 of the sole portion 64 of the aft-body 61. The heel lateral section 80 is attached to the sole 64, both the ribbon 90 and the bottom section 91, as explained in greater detail below. The heel lateral section 80 extends inward a distance, d''', from the perimeter 73 a distance of 0.250 inch to 1.50 inches, more preferably 0.50 inch to 1.0 inch, and most preferably 0.950 inch. The heel lateral section 80 preferably has a general curvature at its edge.

[0077] At the other end of the face component 60 is the toe lateral section 82. The toe lateral section 82 is attached to the sole 64, both the ribbon 90 and the bottom section 91, as explained in greater detail below. The toe lateral section 82 extends inward a distance, d'', from the perimeter 73 a distance of 0.250 inch to 1.50 inches, more preferably 0.75 inch to 1.30 inch, and most preferably 1.20 inch. The toe lateral section 80 preferably has a general curvature at its edge.

[0078] The lower lateral section 78 extends inward, toward the aft-body 61, a distance, d", to engage the sole 64, and a sole extension 95 extends further inward a distance ds to preferably function as protection for the sole of the club head 42. In a preferred embodiment, the distance d" ranges from 0.2 inch to 1.25 inches, more preferably 0.50 inch to 1.10 inch, and most preferably 0.9 inch, as measured from the perimeter 73 of the striking plate portion 72 to the edge of the lower lateral section 78. In a preferred embodiment, the distance ds ranges from 0.2 inch to 3.0 inches, more preferably 0.50 inch to 2.0 inches, and most preferably 1.50 inch, as measured from the edge of the lower lateral section 78 to an apex 97 of the sole extension 95. In a preferred embodiment, the sole extension is triangular in shape with minor apices 99. In an alternative embodiment, not shown, the sole extension 95 has a crescent shape. In yet a further alternative, not shown, the sole extension 95 has a rectangular shape, and extends to the ribbon 90. Those skilled in the pertinent art will recognize that the sole extension 95 may have various shapes and sizes without departing from the scope and spirit of the present invention.

[0079] The sole portion 64 has a sole undercut 64a for placement under the return portion 74. The sole extension 95 is disposed within a sole undercut extension 64aa. The sole 64 and the lower lateral section 78, the heel lateral section 80 and the toe lateral section 82 are attached to each other as explained in greater detail below.

[0080] The aft-body 61 is preferably composed of a non-metal material, preferably a composite material such as continuous fiber pre-preg material (including thermosetting materials or a thermoplastic materials for the resin). Other materials for the aft-body 61 include other thermosetting materials or other thermoplastic materials such as injectable plastics. The aft-body 61 is preferably manufactured through bladder-molding, resin transfer molding, resin infusion, injection molding, compression molding, or a similar process. In a preferred process, the face component 60, with an adhesive on the interior surface of the return portion 74, is placed within a mold with a preform of the aft-body 61 for bladder molding. The return portion 74 is placed and fitted into the undercut portions 62a and 64a. Also, the adhesive may be placed on the undercut portions 62a and 64a. Such adhesives include thermosetting adhesives in a liquid or a film medium. A preferred adhesive is a two part liquid epoxy sold by 3M of Minneapolis Minnesota under the brand names DP420NS and DP460NS. Other alternative adhesives include modified acrylic liquid adhesives such as DP810NS, also sold by the 3M company. Alternatively, foam tapes such as Hysol Synspan may be utilized with the present invention.

[0081] A bladder is placed within the hollow interior of the preform and face component 60, and is pressurized within the mold, which is also subject to heating. The co-molding process secures the aft-body 61 to the face component 60. Alternatively, the aft-body 61 is bonded to the face component 60 using an adhesive, or mechanically secured to the return portion 74.

[0082] As shown in FIG. 8, the return portion 74 overlaps the undercut portions 62a and 64a a distance Lo, which preferably ranges from 0.25 inch to 1.00 inch, more preferably ranges from 0.40 inch to 0.70 inch, and is most preferably 0.50 inch. An annular gap 170 is created between an edge 190 of the crown portion 62 and the sole portion 64, and an edge 195 of the return portion 74. The annular gap 170 preferably has a distance Lg that preferably ranges from 0.020 inch to 0.100 inch, more preferably from 0.050 inch to 0.070 inch, and is most preferably 0.060 inch. A projection 175 from an upper surface of the undercut portions 62a and 64a establishes a minimum bond thickness between the interior surface of the return portion 74 and the upper surface of the undercut portions 62a and 64a. The bond thickness preferably ranges from 0.002 inch to 0.100 inch, more preferably ranges from 0.005 inch to 0.040 inch, and is most preferably 0.030 inch. A liquid adhesive 200 preferably secures the aft body 61 to the face component 60. A leading edge 180 of the undercut portions 62a and 64a may be sealed to prevent the liquid adhesive from entering the hollow interior 46.

[0083] FIGS. 14, 14A, 14B, 14C 14D, 14E, and 14F illustrate a preferred embodiment of the aft-body 61. The crown portion 62 of the aft- body 61 is generally convex toward the sole 64, and engages the ribbon 90 of sole 64 outside of the engagement with the face member 60. The crown portion 62 preferably has a thickness in the range of 0.010 to 0.100 inch, more preferably in the range of 0.025 inch to 0.070 inch, even more preferably in the range of 0.028 inch to 0.040 inch, and most preferably has a thickness of 0.033 inch. The sole portion 64, including the bottom section 91 and the optional ribbon 90 which is substantially perpendicular to the bottom section 91, preferably has a thickness in the range of 0.010 to 0.100 inch, more preferably in the range of 0.025 inch to 0.070 inch, even more preferably in the range of 0.028 inch to 0.040 inch, and most preferably has a thickness of 0.033 inch. The undercut portions 62a, 64a, 64aa and 133a have a similar thickness to the sole portion 64 and the crown portion 62. In a preferred embodiment, the aft-body 61 is composed of a plurality of plies of pre-preg, typically six or seven plies, such as disclosed in U.S. Patent Number 6,248,025, entitled Composite Golf Head And Method Of Manufacturing, which is hereby incorporated by reference in its entirety. The bottom section 91 is generally convex toward the crown portion 62. An optional bladder port 135 is located in the sole undercut portion 64a.

[0084] FIG. 7 illustrates the hollow interior 46 of the club head 42 of the present invention. The hosel 54 is disposed within the hollow interior 46, and is located as a part of the face component 60. The hosel 54 may be composed of a similar material to the face component 60, and is preferably secured to the face component 60 through welding or the like. The hosel 54 may also be formed with the formation of the face component 60. Additionally, the hosel may be composed of a non-similar material that is light weight and secured using bonding or other mechanical securing techniques. A hollow interior 118 of the hosel 54 is defined by a hosel wall 120 that forms a tapering tube from the aperture 59 to the sole potion 64. In a preferred embodiment, the hosel wall 120 does not engage the heel lateral section 80 thereby leaving a void 115 between the hosel wall 120 and the heel lateral section 80. The shaft 48 is disposed within a hosel insert 121 that is disposed within the hosel 54. Such a hosel insert 121 and hosel 54 are described in U.S. Patent Number 6,352,482, filed on August 31, 2000, entitled Golf Club With Hosel Liner, which pertinent parts are hereby incorporated by reference. Further, the hosel 54 is preferably located rearward from the striking plate portion 72 in order to allow for compliance of the striking plate portion 72 during impact with a golf ball. In one embodiment, the hosel 54 is disposed 0.125 inch rearward from the striking plate portion 72.

[0085] As shown in FIG. 7, a weighting member 122 is preferably disposed within the hollow interior 46 of the club head 42. In a preferred embodiment, the weighting member 122 is disposed on the interior surface of the ribbon section 90 of the sole portion 64 in order to increase the moment of inertia and control the center of gravity of the golf club head 42. However, those skilled in the pertinent art will recognize that the weighting member 122, and additional weighting members 122 may be placed in other locations of the club head 42 in order to influence the center of gravity, moment of inertia, or other inherent properties of the golf club head 42. The weighting member 122 is preferably tungsten loaded film, tungsten doped polymers, or similar weighting mechanisms such as described in U.S. Patent Number 6,386,990, filed on December 29, 1999, entitled A Composite Golf Club Head With An Integral Weight Strip, and hereby incorporated by reference in its entirety. Those skilled in the pertinent art will recognize that other high density materials may be utilized as an optional weighting member without departing from the scope and spirit of the present invention.

[0086] In a preferred embodiment, the weight member 122 is composed of three weighting components 122a, 122b and 122c, which are embedded within the plies of pre-preg of the ribbon section 90 of the sole portion 64 of the aft-body 61. A heel weight component 122a, a center weight component 122b and a toe weight component 122c are all disposed within the plies of pre-preg that compose the ribbon section 90. Individually, each of the weight components 122a-c has a mass ranging from 10 grams to 30 grams, preferably from 14 grams to 25 grams, and more preferably from 15 grams to 20 grams. Each of the weight components 122a-c has a density ranging from 5 grams per cubic centimeters to 20 grams per cubic centimeters, more preferably from 7 grams per cubic centimeters to 12 grams per cubic centimeters, and most preferably 8.0 grams per cubic centimeters.

[0087] Each of the weight components 122a-c is preferably composed of a polymer material integrated with a metal material. The metal material is preferably selected from copper, tungsten, steel, aluminum, tin, silver, gold, platinum, or the like. A preferred metal is tungsten due to its high density. The polymer material is a thermoplastic or thermosetting polymer material. A preferred polymer material is polyurethane, epoxy, nylon, polyester, or similar materials. A most preferred polymer material is a thermoplastic polyurethane. A preferred weight component 122a, 122b or 122c is an injection molded thermoplastic polyurethane integrated with tungsten to have a density of 8.0 grams per cubic centimeters. In a preferred embodiment, each of the weight components 122a-c are composed of from 50 to 95 volume percent polyurethane and from 50 to 5 volume percent tungsten. Also, in a preferred embodiment, each of the weight components 122a-c are composed of from 10 to 25 weight percent polyurethane and from 90 to 75 weight percent tungsten.

[0088] Preferably, the weight components 122a-c extend from approximately the heel section 66 of the striking plate portion 72 through the rear section 70 to the toe section 68 of the striking plate portion 72. However, the weight components 122a-c may only extend along the rear section 70 of the ribbon section 90, the heel section 66 of the ribbon section 90, the toe section 68 of the ribbon section 90, or any combination thereof. Also, the weight components 122a-c may be positioned parallel to each other as opposed to being positioned in series. Those skilled in the pertinent art will recognize that other weighting materials may be utilized for the weight components 122a-c without departing from the scope and spirit of the present invention. The placement of the weighting components 122a-c allows for the moment of inertia of the golf club head 40 to be optimized.

[0089] FIG. 13A illustrates a preferred embodiment of the face component of the golf club head 42. FIG. 13A illustrates the variation in the thickness of the striking plate portion 72. The striking plate portion 72 is preferably partitioned into elliptical regions, each having a different thickness. In a preferred embodiment in which the face component 60 is composed of a titanium or titanium alloy material, a central elliptical region 102 preferably has the greatest thickness that ranges from 0.120 inch to 0.090 inch, preferably from 0.115 inch to 0.100 inch, and is most preferably 0.105 inch. The central elliptical region 102 preferably has a uniform thickness. A first concentric region 104 preferably has the next greatest thickness that ranges from 0.110 inch to 0.076 inch, preferably from 0.100 inch to 0.086 inch, and is most preferably 0.088 inch. The first concentric region preferably has a thickness that transitions from the first concentric region 102 thickness to the periphery region 110 thickness. A periphery region 110 preferably has the next greatest thickness that ranges from 0.082 inch to 0.062 inch, and is most preferably 0.072 inch. The variation in the thickness of the striking plate portion 72 allows for the greatest thickness to be localized in the center 111 of the striking plate portion 72 thereby maintaining the flexibility of the striking plate portion 72 which corresponds to less energy loss to a golf ball and a greater coefficient of restitution without reducing the durability of the striking plate portion 72.

[0090] Also shown in FIG. 13A is an optional face component weighting section 113, which provides greater mass to the face component 60 for forward positioning of the center of gravity and heel and toe biasing of the golf club 40. The weighting section 113 is preferably an area of increased thickness. Alternatively, the weighting section 113 is an additional weight welded to the interior surface of the return portion 74 of the face component 60.

[0091] As mentioned previously, the face component 60 is preferably forged from a rod of metal material. One preferred forging process for manufacturing the face component is set forth in U.S. Patent Number 6,440,011, filed on April 13, 2000, entitled Method For Processing A Striking Plate For A Golf Club Head, and hereby incorporated by reference in its entirety. Alternatively, the face component 60 is cast from molten metal in a method such as the well-known lost-wax casting method. The metal for forging or casting is preferably titanium or a titanium alloy such as 6-4 titanium alloy, alpha-beta titanium alloy or beta titanium alloy for forging, and 6-4 titanium for casting.

[0092] Additional methods for manufacturing the face component 60 include forming the face component 60 from a flat sheet of metal, super-plastic forming the face component 60 from a flat sheet of metal, machining the face component 60 from a solid block of metal, electrochemical milling the face from a forged pre-form, and like manufacturing methods. Yet further methods include diffusion bonding titanium sheets to yield a variable face thickness face and then superplastic forming.

[0093] Alternatively, the face component 60 is composed of an amorphous metal material such as disclosed in U.S. Patent Number 6,471,604, which was filed on April 4, 2002 and is hereby incorporated by reference in its entirety.

[0094] The present invention is directed at a golf club head that has a high coefficient of restitution thereby enabling for greater distance of a golf ball hit with the golf club head of the present invention. The coefficient of restitution (also referred to herein as COR) is determined by the following equation:1$e=\frac{v_2-v_1}{U_1-U_2}$

[0095] wherein U1 is the club head velocity prior to impact; U2 is the golf ball velocity prior to impact which is zero; v1 is the club head velocity just after separation of the golf ball from the face of the club head; v2 is the golf ball velocity just after separation of the golf ball from the face of the club head; and e is the coefficient of restitution between the golf ball and the club face.

[0096] The values of e are limited between zero and 1.0 for systems with no energy addition. The coefficient of restitution, e, for a material such as a soft clay or putty would be near zero, while for a perfectly elastic material, where no energy is lost as a result of deformation, the value of e would be 1.0. The present invention provides a club head having a coefficient of restitution ranging from 0.81 to 0.94, as measured under conventional test conditions.

[0097] The coefficient of restitution of the club head 42 of the present invention under standard USGA test conditions with a given ball ranges from approximately 0.81 to 0.94, preferably ranges from 0.83 to 0.883 and is most preferably 0.87.

[0098] Additionally, the striking plate portion 72 of the face component 60 has a smaller aspect ratio than face plates of the prior art. The aspect ratio as used herein is defined as the width, "w", of the face divided by the height, "h", of the face, as shown in FIG. 1A. In one preferred embodiment, the width w is 78 millimeters and the height h is 48 millimeters giving an aspect ratio of 1.625. In conventional golf club heads, the aspect ratio is usually much greater than 1. For example, the original GREAT BIG BERTHA® driver had an aspect ratio of 1.9. The striking plate portion 72 of the present invention has an aspect ratio that is no greater than 1.7. The aspect ratio of the present invention preferably ranges from 1.0 to 1.7. One embodiment has an aspect ratio of 1.3. The striking plate portion 72 of the present invention is more circular than faces of the prior art. The face area of the striking plate portion 72 of the present invention ranges from 4.00 square inches to 7.50 square inches, more preferably from 5.00 square inches to 6.5 square inches, and most preferably from 5.8 square inches to 6.0 square inches.

[0099] The club head 42 of the present invention also has a greater volume than a club head of the prior art while maintaining a weight that is substantially equivalent to that of the prior art. The volume of the club head 42 of the present invention ranges from 290 cubic centimeters to 600 cubic centimeters, and more preferably ranges from 350 cubic centimeters to 510 cubic centimeters, even preferably 360 cubic centimeters to 395 cubic centimeters, and most preferably 385 cubic centimeters.

[0100] The mass of the club head 42 of the present invention ranges from 165 grams to 225 grams, preferably ranges from 175 grams to 205 grams, and most preferably from 190 grams to 200 grams. Preferably, the face component 60 has a mass ranging from 50 grams to 110 grams, more preferably ranging from 65 grams to 95 grams, yet more preferably from 70 grams to 90 grams, and most preferably 78 grams. The aft-body 61 (without weighting) has a mass preferably ranging from 10 grams to 60 grams, more preferably from 15 grams to 50 grams, and most preferably 35 grams to 40 grams. The weighting member 122 (preferably composed of three separate weighting members 122a, 122b and 122c) has a mass preferably ranging from 30 grams to 120 grams, more preferably from 50 grams to 80 grams, and most preferably 60 grams. The interior hosel 54 preferably a mass preferably ranging from 3 grams to 20 grams, more preferably from 5 grams to 15 grams, and most preferably 12 grams. Additionally, epoxy, or other like flowable materials, in an amount ranging from 0.5 grams to 5 grams, may be injected into the hollow interior 46 of the golf club head 42 for selective weighting thereof.

[0101] The depth of the club head 42 from the striking plate portion 72 to the rear section of the crown portion 62 preferably ranges from 3.0 inches to 4.5 inches, and is most preferably 3.5 inches. The height, H, of the club head 42, as measured while in striking position, preferably ranges from 2.0 inches to 3.5 inches, and is most preferably 2.50 inches. The width, W, of the club head 42 from the toe section 68 to the heel section 66 preferably ranges from 4.0 inches to 5.0 inches, and more preferably 4.4 inches.

[0102] FIGS. 10 and 10A illustrate the axes of inertia through the center of gravity of the golf club head. The axes of inertia are designated X, Y and Z. The X axis extends from the striking plate portion 72 through the center of gravity, CG, and to the rear of the golf club head 42. The Y axis extends from the toe section 68 of the golf club head 42 through the center of gravity, CG, and to the heel section 66 of the golf club head 42. The Z axis extends from the crown portion 62 through the center of gravity, CG, and to the sole portion 64.

[0103] As defined in Golf Club Design, Fitting, Alteration & Repair, 4th Edition, by Ralph Maltby, the center of gravity, or center of mass, of the golf club head is a point inside of the club head determined by the vertical intersection of two or more points where the club head balances when suspended. A more thorough explanation of this definition of the center of gravity is provided in Golf Club Design, Fitting, Alteration & Repair. The center of gravity and the moment of inertia of a golf club head 42 are preferably measured using a test frame (XT, YT, ZT), and then transformed to a head frame (XH, YH, ZH), as shown in FIGS. 11 and 11A. The center of gravity of a golf club head may be obtained using a center of gravity table having two weight scales thereon, as disclosed in co-pending U.S. Patent Application Number 09/796,951, filed on February 27, 2001, entitled High Moment Of Inertia Composite Golf Club, and hereby incorporated by reference in its entirety. If a shaft is present, it is removed and replaced with a hosel cube that has a multitude of faces normal to the axes of the golf club head. Given the weight of the golf club head, the scales allow one to determine the weight distribution of the golf club head when the golf club head is placed on both scales simultaneously and weighed along a particular direction, the X, Y or Z direction.

[0104] The center of gravity and the moment of inertia of a golf club head 42 are preferably measured using a test frame (XT, YT, ZT), and then transformed to a head frame (XH, YH, ZH), as shown in FIGS. 11 and 11A. The center of gravity of a golf club head may be obtained using a center of gravity table having two weight scales thereon, as disclosed in co-pending U.S. Patent Application Number 09/796,951, filed on February 27, 2001, entitled High Moment Of Inertia Composite Golf Club, and hereby incorporated by reference in its entirety. If a shaft is present, it is removed and replaced with a hosel cube that has a multitude of faces normal to the axes of the golf club head. Given the weight of the golf club head, the scales allow one to determine the weight distribution of the golf club head when the golf club head is placed on both scales simultaneously and weighed along a particular direction, the X, Y or Z direction.

[0105]

[0106]

[0107] Table One lists the volume of the golf club heads 42, the overall weight, the weight of the head without weight members, the mass of the weight member 122, the coefficient of restitution (COR) on a scale from 0 to 1 using the USGA standard test, the material of the face component, and the process for manufacturing the face component 60. Example 1 is a 430 cubic centimeter golf club head 42 with the total club weighing 270 grams. The face component 60 is composed of a cast titanium, Ti 6-4 material. The aft body 61 is composed of a plurality of plies of pre-preg. The golf club head 42 has a loft angle of eleven degrees and a lie of 54 degrees. The bulge radius is 11 inches and the roll radius is 10 inches. The vertical distance h of the club head of example 1 is 2.14 inches, and the distance w is 3.46 inches. Example 2 is a 510 cubic centimeter golf club head 42 with the total golf club weighing 285 grams. The face component 60 is composed of a forged titanium alloy material, Ti 10-2-3. The aft body 61 is composed of a plurality of plies of pre-preg. The bulge radius is 11 inches and the roll radius is 10 inches. The vertical distance h of the club head of example 2 is 2.54 inches, and the distance w is 3.9 inches. Example 3 is a 385 cubic centimeter golf club head 42 with the total golf club weighing 198 grams. The face component 60 is composed of a forged titanium alloy material. The aft body 61 is composed of a plurality of plies of pre-preg. The golf club head 42 has a loft angle of eleven degrees and a lie of 54 degrees. The bulge radius is 11.5 inches and the roll radius is 10 inches. The vertical distance h of the club head of example 3 is 2.16 inches, and the distance w is 3.60 inches.

[0108] Table Two lists the moment of inertia for exemplary golf club heads 42 of Table One. The moment of inertia is given in grams-centimeter squared (g-cm2). For example 1, the center of gravity is located at 0.901 inch in the X direction, 0.696 inch in the Y direction, and 1.043 inches in the Z direction. For example 3, the center of gravity is located at 0.654 inch in the X direction, 0.645 inch in the Y direction, and 1.307 inches in the Z direction.

[0109] In general, the moment of inertia, Izz, about the Z axis for the golf club head 42 of the present invention will range from 2800g-cm2 to 5000g-cm2, preferably from 3000g-cm2 to 4500g-cm2, and most preferably from 3750g-cm2 to 4250g-cm2. The moment of inertia, Iyy, about the Y axis for the golf club head 42 of the present invention will range from 1500g-cm2 to 2750g-cm2, preferably from 2000g-cm2 to 2400g-cm2, and most preferably from 2100g-cm2 to 2300g-cm2.

[0110] In general, the golf club head 42 has products of inertia such as disclosed in U.S. Patent Number 6,425,832, which was filed on July 26, 2001 and is hereby incorporated by reference in its entirety. Preferably, each of the products of inertia, Ixy, Ixz and Iyz, of the golf club head 42 have an absolute value less than 100 grams-centimeter squared.

[0111] From the foregoing it is believed that those skilled in the pertinent art will recognize the meritorious advancement of this invention and will readily understand that while the present invention has been described in association with a preferred embodiment thereof, and other embodiments illustrated in the accompanying drawings, numerous changes, modifications and substitutions of equivalents may be made therein without departing from the spirit and scope of this invention which is intended to be unlimited by the foregoing except as may appear in the following appended claims. Therefore, the embodiments of the invention in which an exclusive property or privilege is claimed are defined in the following appended claims.

Claims

1. We claim as our invention:

2. The golf club head according to claim 1 wherein the striking plate portion has a thickness in the range of 0.055 inch to 0.125 inch.

3. The golf club head according to claim 1 wherein the striking plate portion has a thickness in the range of 0.060 inch to 0.111 inch.

4. The golf club head according to claim 1 wherein the aft-body is composed of a plurality of plies of pre-preg material.

5. The golf club head according to claim 1 wherein the striking plate portion has an aspect ratio no greater than 1.7.

6. The golf club head according to claim 1 wherein the striking plate portion has concentric regions of varying thickness with the thickest region in about the center.

7. The golf club head according to claim 1 wherein the golf club head has a volume ranging from 290 cubic centimeters to 600 cubic centimeters.

8. The golf club head according to claim 1 wherein the moment of inertia about the Izz axis of the golf club head is greater than 3000 grams- centimeter squared.

9. The golf club head according to claim 1 wherein the face component is composed of a metal material selected from the group consisting of titanium alloy, amorphous metal, stainless steel and maraging steel.

10. A golf club head comprising: