Golf Club Head

Abstract

To provide a head for golf club having a control and adjustment mechanism of characteristics time (CT).SOLUTION: The present invention provides a golf club head having a body and a face part coupled to the body, The face part has different thicknesses. An area weight of a crown part of the golf club head is less than about 0.35 g / cm2 across about 50% or more of the total surface area of the crown part. An area weight of a sole part of the golf club head is less than about 0.35 g / cm2 across about 50% of the total surface area of the sole part. A striking face includes a center region defined by a longitudinal rectangular region of 40 mm×20 mm in a heel-toe direction with a center of the striking face as a center. In the center region, a maximum thickness of the face part is 5 mm or less, and a minimum thickness of the face part is 2.4 mm or more.SELECTED DRAWING: None

Description

Summary of the Invention

[0001] Field FIELD OF THE DISCLOSURE This disclosure relates generally to golf clubs, and more specifically to golf club heads having characteristic time (CT) control and adjustment mechanisms.

[0002] background Modern "wood-type" golf clubs (particularly "drivers," "fairway woods," and "utility or hybrid clubs") are commonly referred to as "metal woods" because they tend to be made from a strong, lightweight metal such as titanium. An exemplary metal wood golf club, such as a driver or fairway wood, typically includes a hollow shaft and a golf club head coupled to the lower end of the shaft. Most modern club heads are made at least in part from a lightweight but strong metal such as a titanium alloy. In most cases, a golf club head includes a hollow body having a face portion. The face portion has a front surface, known as a striking plate, that is configured to contact a golf ball during a proper golf swing.

[0003] Under USGA rules governing the construction of golf club heads, the characteristic time (CT) of a golf club head at any point on the face within the striking zone must not exceed a prescribed CT threshold. Conventional golf club heads may sacrifice some performance characteristics as a cost of meeting the prescribed CT threshold. For example, some golf club heads have thickened the face in areas away from the center of the face in an attempt to meet the CT threshold in such areas. However, such attempts have resulted in a corresponding reduction in CT at the center of the face. Furthermore, to ensure that the CT does not exceed the prescribed CT threshold, some conventional golf club heads are carefully designed to have a CT within a large standard deviation of the desired CT below the prescribed CT threshold. However, such a large standard deviation may result in a batch of manufactured golf club heads having significantly non-uniform performance characteristics. Thus, it may be difficult to meet the prescribed CT threshold while simultaneously reducing the adverse effects on other performance characteristics of the golf club head.

[0004] summary The subject matter of the present application was developed in response to the current state of the art, and in particular in response to shortcomings in golf clubs and related golf club heads that have not yet been fully addressed by currently available technology. Accordingly, the subject matter of the present application was developed to provide golf clubs and golf club heads that overcome at least some of the above-mentioned shortcomings of the prior art.

[0005] The characteristic time (CT) of a golf club head is the length of time that the metal hemisphere at the end of the pendulum remains in contact with the face of the golf club head while the metal hemisphere bounces against the face. The properties of the pendulum and the metal hemisphere, as well as the constraints of the CT test equipment, are specified by the United States Golf Association (USGA) under the Golf Club Head Flexibility Measurement Procedure, which is published at www.usga.org and incorporated herein by reference. The CT of a golf club head is directly related to the flexibility or spring-like effect of the face of the golf club head. In other words, the more flexible the face, the higher the CT of the golf club head. Under the USGA rules governing the construction of golf club heads, the CT of a golf club head at any point of the face within the striking zone must not exceed a specified CT threshold.

[0006] In some instances, the golf club heads of the present disclosure facilitate lowering the CT of the face away from the center of the face without adversely affecting the performance of the face at the center as compared to conventional golf club heads. Additionally, in certain instances, the golf club heads of the present disclosure reduce the standard deviation in CT for a batch of manufactured golf club heads as compared to conventional golf club heads.

[0007] Disclosed herein is a golf club head including a body. The body defines an internal cavity. The body also includes a sole portion disposed at a bottom region of the golf club head. The sole portion has a sole surface region. The body further includes a crown portion disposed at a top region of the golf club head. The crown portion has a crown surface region. The body further includes a skirt portion disposed about the periphery of the golf club head between the sole portion and the crown portion, a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the front region of the body. The face portion includes a striking face and an inner surface opposite the striking face. The golf club head further includes a plurality of reinforcements disposed within the internal cavity of the body in direct contact with the inner surface of the face portion. The reinforcements are made of a material having a hardness of at least Shore 5.95D. The crown portion of the golf club head has an areal weight of about 0.35 g / cm over about 50% or more of the total surface area of ​​the crown portion. 2 The golf club head has a center of gravity (CG) having a head center face origin x-axis coordinate of about -5 mm to about 5 mm, a head center face origin y-axis coordinate of about 25 mm to about 50 mm, and a center face head origin z-axis coordinate of less than 2 mm. The striking face has a central region defined by a 40 mm by 20 mm rectangular region centered at the center of the striking face and elongated in a heel-toe direction. The face portions have different thicknesses. Within the central region, the face portions have a maximum face thickness of 4.5 mm or less and a minimum face thickness of 2.0 mm or more. Within the central region, the striking face has a characteristic time (CT) of 257 microseconds or less. Within the central region, 25% or more of the striking face has a coefficient of restitution (COR) of at least 0.8. Within the central region, 60% or more of the striking face has a CT of at least 235 microseconds. Within the central region, at least 35% of the striking face has a CT of at least 240 microseconds. 3 ~about 500cm 3The club head has a volume of 1.5 kg / mm2, a moment of inertia (Izz) around the z-axis of the center of gravity of the head, and a moment of inertia (Ixx) around the x-axis of the center of gravity of the head. The sum of Izz and Ixx is approximately 740 kg / mm2. 2 ~1100kg・mm 2 The preceding subject matter of this paragraph characterizes Example 1 of the present disclosure.

[0008] More than 20% of the striking face has a CT of at least 245 microseconds.The preceding subject matter of this paragraph characterizes Example 2 of the present disclosure, which also includes the subject matter of Example 1 above.

[0009] Within the central region, 50% or more of the striking face has a COR of at least 0.8.The preceding subject matter of this paragraph characterizes Example 3 of the present disclosure, which also includes the subject matter of any one of Examples 1-2 above.

[0010] Within the central region, 55% or more of the striking face has a COR of at least 0.8.The preceding subject matter of this paragraph characterizes Example 4 of the present disclosure, which also includes subject matter related to Example 3 above.

[0011] Within the central region, 68% or more of the striking face has a COR of at least 0.8.The preceding subject matter of this paragraph characterizes Example 5 of the present disclosure, which also includes the subject matter pertaining to Example 4 above.

[0012] At least a portion of the crown portion is made of a non-metallic composite material.The preceding subject matter of this paragraph characterizes Example 6 of the present disclosure, which also includes the subject matter of any one of Examples 1-5 above.

[0013] The crown portion is made of a metal alloy.The preceding subject matter of this paragraph characterizes Example 7 of the present disclosure, which also includes the subject matter of any one of Examples 1-6 above.

[0014] The area weight of the sole of the golf club head is about 0.35 g / cm over about 50% or more of the total surface area of ​​the sole. 2The preceding subject matter of this paragraph characterizes Example 8 of the present disclosure, which in turn includes the subject matter of any one of Examples 1-7 above.

[0015] The body and face portion together form a single monolithic structure.The preceding subject matter of this paragraph characterizes Example 9 of the present disclosure, which also includes the subject matter of any one of Examples 1-8 above.

[0016] The face portion includes a face opening and a striking plate welded to the face opening. The preceding subject matter of this paragraph characterizes Example 10 of the present disclosure, which also includes the subject matter of any one of Examples 1-9 above.

[0017] The sum of Izz and Ixx is approximately 790kg mm 2 The preceding subject matter of this paragraph characterizes Example 11 of the present disclosure, which also includes the subject matter of any one of Examples 1-10 above.

[0018] The sum of Izz and Ixx is approximately 805kg mm 2 The preceding subject matter of this paragraph characterizes Example 12 of the present disclosure, which also includes the subject matter of any one of Examples 1-11 above.

[0019] Ixx is 305kg mm 2 The preceding subject matter of this paragraph characterizes Example 13 of the present disclosure, which also includes the subject matter of any one of Examples 1-12 above.

[0020] Ixx is 320kg mm 2 The preceding subject matter of this paragraph characterizes Example 14 of the present disclosure, which also includes the subject matter of any one of Examples 1-13 above.

[0021] Ixx is 350kg mm 2 The preceding subject matter of this paragraph characterizes Example 15 of the present disclosure, which also includes the subject matter of any one of Examples 1-14 above.

[0022] At least 60% of the striking face in the central region has a CT of at least 240 microseconds.The preceding subject matter of this paragraph characterizes Example 16 of the present disclosure, which also includes the subject matter of any one of Examples 1-15 above.

[0023] At least 70% of the striking face within the central region has a CT of at least 240 microseconds.The preceding subject matter of this paragraph characterizes Example 17 of the present disclosure, which also includes the subject matter of Example 16 above.

[0024] At least 40% of the striking face in the central region has a CT of at least 245 microseconds.The preceding subject matter of this paragraph characterizes Example 18 of the present disclosure, which also includes the subject matter of any one of Examples 1-17 above.

[0025] At least 50% of the striking face within the central region has a CT of at least 245 microseconds.The preceding subject matter of this paragraph characterizes Example 19 of the present disclosure, which also includes the subject matter of Example 18 above.

[0026] At least 10% of the striking faces in the central region have a CT of at least 250 microseconds.The preceding subject matter of this paragraph characterizes Example 20 of the present disclosure, which also includes the subject matter of any one of Examples 1-19 above.

[0027] At least 15% of the striking face within the central region has a CT of at least 250 microseconds.The preceding subject matter of this paragraph characterizes Example 21 of the present disclosure, which also includes the subject matter of Example 20 above.

[0028] The CT at any location on the striking face within at least 5 millimeters from the center of the striking face is greater than 240 microseconds. The preceding subject matter of this paragraph characterizes Example 22 of the present disclosure, which also includes the subject matter of any one of Examples 1-21 above.

[0029] The CT of the striking face peaks at a distance of at least 30 millimeters in a toe direction from the center of the striking face along a horizontal path on the striking face that passes through the center of the striking face. The preceding subject matter of this paragraph characterizes Example 23 of the present disclosure, which also includes the subject matter of any one of Examples 1-22 above.

[0030] The face portion further includes an opening extending through the face portion from the striking face to the inner surface thereof, and a plug immovably fixed and retained within the opening. The plug protrudes no more than 0.15 millimeters from the striking face or is recessed no more than 0.1 millimeters below the surface of the striking face. The preceding subject matter of this paragraph characterizes Example 24 of the present disclosure, which also includes the subject matter of any one of Examples 1-23 above.

[0031] The opening includes female threads. The plug includes male threads that mate with the female threads of the opening. The preceding subject matter of this paragraph characterizes Example 25 of the present disclosure, which also includes the subject matter of Example 24 above.

[0032] The aperture further includes a counterbore disposed between the female threads and the striking face. The plug includes a head portion that telescopically engages the counterbore. The preceding subject matter of this paragraph characterizes Example 26 of the present disclosure, which also includes the subject matter of Example 25 above.

[0033] The plug comprises a portion of the reinforcement material.The preceding subject matter of this paragraph characterizes Example 27 of the present disclosure, which also includes the subject matter of any one of Examples 24-26 above.

[0034] The plug comprises a polymeric material.The preceding subject matter of this paragraph characterizes Example 28 of the present disclosure, which also includes the subject matter of any one of Examples 24-26 above.

[0035] Further disclosed herein is a golf club head. The golf club head includes a body defining an internal cavity and including a sole portion disposed at a bottom region of the golf club head. The sole portion has a sole surface region. The body further includes a crown portion disposed at a top region of the golf club head. The crown portion has a crown surface region. The body also includes a skirt portion disposed around the periphery of the golf club head between the sole portion and the crown portion. The body further includes a forward region, a rear region opposite the forward region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the forward region of the body. The face portion includes a striking face and an inner surface opposite the striking face. The golf club head further includes a plurality of reinforcements disposed within the internal cavity of the body and in direct contact with the inner surface of the face portion. The plurality of reinforcements are a plurality of ribs made of the same material as the body. The face portion has a different thickness. The maximum thickness of the face portion is equal to or less than 5 mm, and the minimum thickness of the face portion is less than 3 mm. The crown weight of the golf club head is about 0.35 g / cm over about 50% or more of the total surface area of ​​the crown. 2 The weight per area of ​​the sole of the golf club head is less than about 0.35 g / cm over at least about 50% of the total surface area of ​​the sole. 2 The striking face has a central region defined by a 40 millimeter by 20 millimeter rectangular region centered on the center of the striking face and elongated in a heel-toe direction. Within the central region, the striking face has a characteristic time (CT) of 257 microseconds or less. Within the central region, 25% or more of the striking face has a coefficient of restitution (COR) of at least 0.8. Within the central region, 60% or more of the striking face has a CT of at least 235 microseconds. Within the central region, 35% or more of the striking face has a CT of at least 240 microseconds. The foregoing subject matter of this paragraph characterizes Example 29 of the present disclosure.

[0036] The plurality of ribs are disposed proximate the transition between the face portion and the crown portion. The preceding subject matter of this paragraph characterizes Example 30 of the present disclosure, which also includes the subject matter of Example 29 above.

[0037] The plurality of ribs are disposed proximate the transition between the face portion and the sole portion. The preceding subject matter of this paragraph characterizes Example 31 of the present disclosure, which also includes the subject matter of any one of Examples 29-30 above.

[0038] The body and face portion together form a single monolithic structure. The preceding subject matter of this paragraph characterizes Example 32 of the present disclosure, which also includes the subject matter of any one of Examples 29-31 above.

[0039] The face portion has a face opening and a striking plate welded to the face opening. The preceding subject matter of this paragraph characterizes Example 33 of the present disclosure, which also includes the subject matter of any one of Examples 29-31 above.

[0040] At least one of the plurality of ribs has a head origin x-axis coordinate of +15 mm to +25 mm, and at least one of the plurality of ribs has a head origin x-axis coordinate of -15 mm to -25 mm. The preceding subject matter of this paragraph characterizes Example 34 of the present disclosure, which also includes the subject matter of any one of Examples 29-33 above.

[0041] Further disclosed herein is a golf club head including a body. The body includes a sole portion defining an internal cavity and disposed at a bottom region of the golf club head. The sole portion has a sole surface region. The body also includes a crown portion disposed at a top region of the golf club head. The crown portion has a crown surface region. The body further includes a skirt portion disposed around the golf club head between the sole portion and the crown portion, a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The body also includes a face portion coupled to the body at the front region of the body. The face portion includes a striking face and an inner surface opposite the striking face. The body further includes a plurality of stiffeners disposed within the internal cavity of the body and offset from the inner surface of the face portion by at least 1 mm and no more than 20 mm as measured along a head origin y-axis. The plurality of stiffeners are elongated reinforcing members extending between an inner surface of the crown portion and an inner surface of the sole portion. The face portion has different thicknesses. The maximum thickness of the face portion is 5 mm or less, and the minimum thickness of the face portion is less than 3 mm. The crown portion of the golf club head has an areal weight of about 0.35 g / cm over at least about 50% of the total surface area of ​​the crown portion. 2 The weight per area of ​​the sole of the golf club head is less than about 0.35 g / cm over at least about 50% of the total surface area of ​​the sole. 2 The striking face has a central region defined by a 40 millimeter by 20 millimeter rectangular region centered on the center of the striking face and elongated in a heel-toe direction. Within the central region, the striking face has a characteristic time (CT) of 257 microseconds or less. Within the central region, 25% or more of the striking face has a coefficient of restitution (COR) of at least 0.8. Within the central region, 60% or more of the striking face has a CT of at least 235 microseconds. Within the central region, 35% or more of the striking face has a CT of at least 240 microseconds. The foregoing subject matter of this paragraph characterizes Example 35 of the present disclosure.

[0042] The body and face portion together form a single monolithic structure. The preceding subject matter of this paragraph characterizes Example 36 of the present disclosure, which also includes the subject matter of Example 35 above.

[0043] The face portion has a face opening and a striking plate welded to the face opening. The preceding subject matter of this paragraph characterizes Example 37 of the present disclosure, which also includes the subject matter of Example 35 above.

[0044] Within the central region, the thickness of the face portion is greatest proximate the center of the striking face. The preceding subject matter of this paragraph characterizes Example 38 of the present disclosure, which also includes the subject matter of any one of Examples 35-37 above.

[0045] The thickness of the face portion at the center of the striking face is greater than 2.9 mm.The preceding subject matter of this paragraph characterizes Example 39 of the present disclosure, which also includes the subject matter of any one of Examples 35-38 above.

[0046] The plurality of stiffeners includes two or more brace bars. The two or more brace bars each have a mass per unit length of 0.005 g / mm to 0.40 g / mm. The preceding subject matter of this paragraph characterizes Example 40 of the present disclosure, which also includes the subject matter of any one of Examples 35-39 above.

[0047] The body further comprises a channel. The golf club head further comprises one or more polymer reinforcements disposed within the channel, and the body further comprises a channel. The golf club head further comprises one or more polymer reinforcements disposed within the channel. The preceding subject matter of this paragraph characterizes Example 41 of the present disclosure, which also includes the subject matter of any one of Examples 35-40 above.

[0048] At least one of the plurality of reinforcements has a head origin x-axis coordinate of +15 mm to +25 mm, and at least one of the plurality of reinforcements has a head origin x-axis coordinate of -15 mm to -25 mm. The preceding subject matter of this paragraph characterizes Example 42 of the present disclosure, which also includes the subject matter of any one of Examples 35-41 above.

[0049] Further disclosed herein is a golf club head including a body. The body defines an internal cavity and includes a sole portion disposed at a bottom region of the golf club head, the sole portion having a sole surface region. The body also defines a crown portion disposed at a top region of the golf club head, the crown portion having a crown surface region. The body further defines a skirt portion disposed around the periphery of the golf club head between the sole portion and the crown portion. The body further defines a forward region, a rear region opposite the forward region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the forward region of the body, the face portion including a striking face and an inner surface opposite the striking face. The face portion has a different thickness. The crown portion of the golf club head has an areal weight of about 0.35 g / cm over about 50% or more of the total surface area of ​​the crown portion. 2 The weight per area of ​​the sole of the golf club head is less than about 0.35 g / cm over at least about 50% of the total surface area of ​​the sole. 2 The striking face has a central region defined by a 40 millimeter by 20 millimeter rectangular region centered on the center of the striking face and elongated in a heel-toe direction. Within the central region, the maximum thickness of the face portion is 4 mm or less and the minimum thickness of the face portion is 2.4 mm or more. Within the central region, the striking face has a characteristic time (CT) of 257 microseconds or less. Within the central region, 25% or more of the striking face has a coefficient of restitution (COR) of at least 0.8. Within the central region, 60% or more of the striking face has a CT of at least 235 microseconds. Within the central region, 50% or more of the striking face has a CT of at least 240 microseconds. The foregoing subject matter of this paragraph characterizes Example 43 of the present disclosure.

[0050] The body and face portion together form a single monolithic structure. The preceding subject matter of this paragraph characterizes Example 44 of the present disclosure, which also includes the subject matter of Example 43 above.

[0051] The face portion has a face opening and a striking plate welded to the face opening. The preceding subject matter of this paragraph characterizes Example 45 of the present disclosure, which also includes the subject matter of Example 43 above.

[0052] Within the central region, the thickness of the face portion is greatest proximate the center of the striking face. The preceding subject matter of this paragraph characterizes Example 46 of the present disclosure, which also includes the subject matter of any one of Examples 43-45 above.

[0053] The thickness of the face portion at the center of the striking face is greater than 2.9 mm.The preceding subject matter of this paragraph characterizes Example 47 of the present disclosure, which also includes the subject matter of any one of Examples 43-46 above.

[0054] Within the central region, 15% or more of the striking face has a CT of at least 245 microseconds.The preceding subject matter of this paragraph characterizes Example 48 of the present disclosure, which also includes the subject matter of any one of Examples 43-47 above.

[0055] The sole portion, crown portion, and skirt portion of the body are integral to form a single monolithic structure, the face portion includes a face opening, and the striking plate surrounds the face opening. The preceding subject matter of this paragraph characterizes Example 49 of the present disclosure, which also includes the subject matter of any one of Examples 43-48 above.

[0056] The face portion includes a face opening and a striking plate welded to the face opening. The preceding subject matter of this paragraph characterizes Example 50 of the present disclosure, which also includes the subject matter of any one of Examples 43 and 45-49 above.

[0057] The face portion includes a face opening and a striking plate coupled or adhered to the face opening. The preceding subject matter of this paragraph characterizes Example 51 of the present disclosure, which also includes the subject matter of any one of Examples 43 and 45-49 above.

[0058] The body and face portion are integral to form a single monolithic structure. The crown portion includes a crown opening, and the crown insert surrounds the crown opening. The crown insert is formed of a material having a lower density than the remainder of the body and the face portion. The preceding subject matter of this paragraph characterizes Example 52 of the present disclosure, which also includes subject matter according to any one of Examples 43, 44, and 46-49 above.

[0059] The golf club head further includes two or more brace bars extending from the inner surface of the sole portion to the inner surface of the crown portion, each of the two or more brace bars having a mass per unit length of 0.005 g / mm to 0.40 g / mm. The preceding subject matter of this paragraph characterizes Example 53 of the present disclosure, which also includes the subject matter of any one of Examples 43 to 52 above.

[0060] The two or more brace bars are formed of the same material as the body. The preceding subject matter of this paragraph characterizes Example 54 of the present disclosure, which also includes the subject matter of Example 53 above.

[0061] The two or more brace bars are formed of a material having a lower density than the body. The preceding subject matter of this paragraph characterizes Example 55 of the present disclosure, which also includes the subject matter of any one of Examples 53-54 above.

[0062] The two or more brace bars have a head origin y-axis coordinate between a head origin y-axis coordinate of the center of gravity of the golf club head and a head origin y-axis coordinate of the face portion of the golf club head. The preceding subject matter of this paragraph characterizes Example 56 of the present disclosure, which also includes the subject matter of any one of Examples 53-55 above.

[0063] The two or more brace bars are disposed between 1 mm and 20 mm from the face portion. The preceding subject matter of this paragraph characterizes Example 57 of the present disclosure, which also includes the subject matter of any one of Examples 53-56 above.

[0064] The two or more brace bars are positioned at least 20 mm forward of the center of gravity of the golf club head as measured along the head origin y-axis. The preceding subject matter of this paragraph characterizes Example 58 of the present disclosure, which also includes the subject matter of any one of Examples 53-57 above.

[0065] Within the central region, a ratio of a thickness of the thinnest portion of the face portion to a thickness of the thickest portion of the face portion is greater than or equal to 0.60 and less than or equal to 1.0. The preceding subject matter of this paragraph characterizes Example 59 of the present disclosure, which also includes the subject matter of any one of Examples 53-58 above.

[0066] Within the central region, a ratio of a thickness of the thinnest portion of the face portion to a thickness of the thickest portion of the face portion is greater than or equal to 0.70 and less than or equal to 1.0. The preceding subject matter of this paragraph characterizes Example 60 of the present disclosure, which also includes the subject matter of any one of Examples 53-59 above.

[0067] Within the central region, 50% or more of the striking face has a COR of at least 0.8. The preceding subject matter of this paragraph characterizes Example 61 of the present disclosure, which also includes the subject matter of any one of Examples 53-60 above.

[0068] Disclosed herein is a golf club head including a body and a face portion. The body defines an internal cavity and includes a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head, a skirt portion disposed around the golf club head between the sole portion and the crown portion, a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The face portion is coupled to the body at the front region of the body and includes a striking plate. The golf club head further includes at least one rib within the internal cavity and at least one reinforcement directly coupled to the face portion at a location where the x-axis coordinate of the golf club head's club head origin coordinate system is greater than 20 mm and less than 50 mm or greater than -50 mm and less than -20 mm. The ratio of the height of the at least one rib to the height of the face portion is equal to or greater than 0.15. The foregoing subject matter of this paragraph characterizes Example 62 of the present disclosure.

[0069] The ratio of the height of the at least one rib to the height of the face portion is greater than or equal to 0.20. The preceding subject matter of this paragraph characterizes Example 63 of the present disclosure, which also includes the subject matter of Example 62 above.

[0070] The ratio of the height of the at least one rib to the height of the face portion is greater than or equal to 0.25. The preceding subject matter of this paragraph characterizes Example 64 of the present disclosure, which also includes the subject matter of Example 63 above.

[0071] The at least one rib is directly bonded to the face portion at the bottom region. The at least one reinforcement further includes at least one rib directly bonded to the face portion at the top region. A ratio of the sum of the height of the at least one rib directly bonded to the face portion at the bottom region and the height of the at least one rib directly bonded to the face portion at the top region to the height of the face portion is equal to or greater than 0.3. The preceding subject matter of this paragraph characterizes Example 65 of the present disclosure, which also includes subject matter according to any one of Examples 62-64 above.

[0072] A ratio of the sum of the height of the at least one rib directly connected to the face portion at the bottom region and the height of the at least one rib directly connected to the face portion at the top region to the height of the face portion is equal to or greater than 0.4. The preceding subject matter of this paragraph characterizes Example 66 of the present disclosure, which also includes the subject matter of Example 65 above.

[0073] At least one rib is directly connected to the face portion at a position where the x-axis coordinate of the golf club head's club head origin coordinate system is greater than 30 mm and less than 40 mm, or greater than -40 mm and less than -30 mm. The preceding subject matter of this paragraph characterizes Example 67 of the present disclosure, which also includes the subject matter of any one of Examples 62 to 66 above.

[0074] The at least one reinforcement member includes at least two ribs. One of the at least two ribs is directly connected to the face portion at the bottom region at a position where the x-axis coordinate of the golf club head's club head origin coordinate system is greater than 30 mm and less than 40 mm. Another of the at least two ribs is directly connected to the face portion at the bottom region at a position where the x-axis coordinate of the golf club head's club head origin coordinate system is greater than 40 mm and less than 50 mm. The preceding subject matter of this paragraph characterizes Example 68 of the present disclosure, which also includes subject matter according to any one of Examples 62-67 above.

[0075] A ratio of a height of one of the at least two ribs directly connected to the face portion at the bottom region at a position where the x-axis coordinate of the golf club head's club head origin coordinate system is greater than 30 mm and less than 40 mm to a height of the face portion is 0.17. A ratio of a height of another of the at least two ribs directly connected to the face portion at the bottom region at a position where the x-axis coordinate of the golf club head's club head origin coordinate system is greater than 40 mm and less than 50 mm to a height of the face portion is 0.23. The preceding subject matter of this paragraph characterizes Example 69 of the present disclosure, and Example 69 also includes the subject matter according to Example 68 above.

[0076] The at least one reinforcement member includes at least two ribs. A first rib of the at least two ribs is located at a position where an x-axis coordinate of a club head origin coordinate system of the golf club head is greater than 20 mm and less than 50 mm. A second rib of the at least two ribs is located at a position where an x-axis coordinate of a club head origin coordinate system of the golf club head is greater than -50 mm and less than -20 mm. The preceding subject matter of this paragraph characterizes Example 70 of the present disclosure, which also includes subject matter according to any one of Examples 62-69 above.

[0077] The at least one reinforcement member includes at least two ribs. The at least two ribs are located at a position where the x-axis coordinate of the golf club head origin coordinate system is greater than 20 mm and less than 50 mm. The preceding subject matter of this paragraph characterizes Example 71 of the present disclosure, which also includes the subject matter of any one of Examples 62-70 above.

[0078] One of the at least two ribs is directly connected to the face portion at the apex region at a position where the x-axis coordinate of the golf club head's club head origin coordinate system is greater than 30 mm and less than 40 mm. Another of the at least two ribs is directly connected to the face portion at the apex region at a position where the x-axis coordinate of the golf club head's club head origin coordinate system is greater than 40 mm and less than 50 mm. The preceding subject matter of this paragraph characterizes Example 72 of the present disclosure, which also includes the subject matter of Example 71 above.

[0079] The at least one rib is directly bonded to the face portion at the top region of the golf club head. The preceding subject matter of this paragraph characterizes Example 73 of the present disclosure, which also includes the subject matter of any one of Examples 62-72 above.

[0080] At least one rib is directly bonded to the face portion at the bottom region of the golf club head. The preceding subject matter of this paragraph characterizes Example 74 of the present disclosure, which also includes the subject matter of any one of Examples 62-73 above.

[0081] The height of the at least one rib also decreases in a direction from the anterior region to the posterior region. The preceding subject matter of this paragraph characterizes Example 75 of the present disclosure, which also includes the subject matter of any one of Examples 62-74 above.

[0082] The golf club head further includes a slot formed in the sole portion and extending longitudinally from the heel region to the toe region. At least one rib is coupled to the slot and disposed between the slot and the face portion. The preceding subject matter of this paragraph characterizes Example 76 of the present disclosure, which also includes subject matter according to any one of Examples 62-75 above.

[0083] The body includes an outer wall. The golf club head further includes at least one opening formed in the outer wall of the body and opening directly into the at least one rib. The preceding subject matter of this paragraph characterizes Example 77 of the present disclosure, which also includes the subject matter of any one of Examples 1-76 above.

[0084] At least one rib is directly coupled to the striking plate of the face portion. The preceding subject matter of this paragraph characterizes Example 78 of the present disclosure, which also includes the subject matter of any one of Examples 62-77 above.

[0085] At least one rib is directly bonded to the face portion along an entire height of the at least one rib. The preceding subject matter of this paragraph characterizes Example 79 of the present disclosure, which also includes the subject matter of any one of Examples 62-78 above.

[0086] Further disclosed herein is a golf club head. The golf club head includes a body and a face portion. The body defines an internal cavity and includes a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head, a skirt portion disposed around the golf club head between the sole portion and the crown portion, a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the front region of the body and including a striking plate. The golf club head further includes at least one reinforcement member including discrete masses of polymeric material within the internal cavity and directly coupled to the face portion at a location on the x-axis coordinate of the golf club head origin coordinate system that is greater than 20 mm and less than 50 mm or greater than -50 mm and less than -20 mm. The at least one discrete mass of polymeric material has a hardness of about Shore 10D or greater. The foregoing subject matter of this paragraph characterizes Example 80 of the present disclosure.

[0087] The polymeric material has a hardness of about Shore 20 D or greater. The preceding subject matter of this paragraph characterizes Example 81 of the present disclosure, which also includes the subject matter of Example 80 above.

[0088] The polymeric material has a hardness of greater than or equal to about Shore 45 D. The preceding subject matter of this paragraph characterizes Example 82 of the present disclosure, which also includes the subject matter of Example 81 above.

[0089] The polymeric material has a hardness of greater than or equal to about Shore 85 D. The preceding subject matter of this paragraph characterizes Example 83 of the present disclosure, which also includes the subject matter of Example 82 above.

[0090] The polymeric material is acrylic. The preceding subject matter of this paragraph characterizes Example 84 of the present disclosure, which also includes the subject matter of any one of Examples 80-83 above.

[0091] The polymeric material is a thermosetting material. The preceding subject matter of this paragraph characterizes Example 85 of the present disclosure, which also includes the subject matter of any one of Examples 80-84 above.

[0092] The polymeric material is a thermoplastic material. The preceding subject matter of this paragraph characterizes Example 86 of the present disclosure, which also includes the subject matter of any one of Examples 80-85 above.

[0093] The golf club head further includes a retaining wall coupled to the sole portion, projecting upright from the sole portion, and extending longitudinally in a heel-toe direction. Discrete masses of polymeric material are coupled to the retaining wall and disposed between the retaining wall and the face portion. The preceding subject matter of this paragraph characterizes Example 87 of the present disclosure, which also includes subject matter according to any one of Examples 80-86 above.

[0094] The golf club head further includes a slot coupled to the sole portion and extending longitudinally from the heel region to the toe region. The retaining wall forms a portion of the slot. The preceding subject matter of this paragraph characterizes Example 88 of the present disclosure, which also includes the subject matter of Example 87 above.

[0095] The retaining wall projects further from the sole portion than the slot. The preceding subject matter of this paragraph characterizes Example 89 of the present disclosure, which also includes the subject matter of Example 88 above.

[0096] The at least one reinforcement further comprises a foam. The discrete masses of polymeric material are supported on the foam. The foam is coupled to the slots and disposed between the slots and the face portion. The foam is disposed between the discrete masses of polymeric material and the sole portion. The preceding subject matter of this paragraph characterizes Example 90 of the present disclosure, which also includes subject matter according to any one of Examples 88-89 above.

[0097] The at least one reinforcement further includes an enclosure made of foam and bonded to the face portion. The enclosure defines a cavity that contains and laterally retains discrete masses of polymeric material. The cavity is open to the face portion. The preceding subject matter of this paragraph characterizes Example 91 of the present disclosure, which also includes subject matter according to any one of Examples 80-90 above.

[0098] The golf club head further includes a plurality of reinforcements. The enclosures of the plurality of reinforcements are spaced apart from one another. The preceding subject matter of this paragraph characterizes Example 92 of the present disclosure, which also includes the subject matter of Example 91 above.

[0099] The golf club head further includes a plurality of stiffeners. The enclosure of the plurality of stiffeners forms an integral monolithic structure. The preceding subject matter of this paragraph characterizes Example 93 of the present disclosure, which also includes the subject matter of Example 91 above.

[0100] The body includes an outer wall. The golf club head further includes at least one opening formed in the outer wall of one of the body or face portion and opening directly into the discrete mass of polymeric material. The preceding subject matter of this paragraph characterizes Example 94 of the present disclosure, which also includes the subject matter of any one of Examples 80-93 above.

[0101] At least one opening is formed in the outer wall of the face portion. The preceding subject matter of this paragraph characterizes Example 95 of the present disclosure, which also includes the subject matter of Example 94 above.

[0102] The golf club head further includes a plurality of reinforcements, and at least one of the amount of polymeric material in one discrete mass is different from the amount of polymeric material in another discrete mass, or the type of polymeric material in one discrete mass is different from the type of polymeric material in another discrete mass. The preceding subject matter of this paragraph characterizes Example 96 of the present disclosure, which also includes the subject matter of any one of Examples 80-95 above.

[0103] The discrete masses of polymeric material are bonded directly to the striking plate of the face portion. The preceding subject matter of this paragraph characterizes Example 97 of the present disclosure, which also includes the subject matter of any one of Examples 80-96 above.

[0104] The discrete masses of polymeric material are bonded directly to the face portion at locations at least 5 mm away from the outer periphery of the face portion. The preceding subject matter of this paragraph characterizes Example 98 of the present disclosure, which also includes the subject matter of any one of Examples 80-97 above.

[0105] The discrete masses of polymeric material are bonded directly to the face portion at locations at least 15 mm away from the outer periphery of the face portion. The preceding subject matter of this paragraph characterizes Example 99 of the present disclosure, which also includes the subject matter of Example 98 above.

[0106] The discrete masses of polymeric material are at least 50 mm 2 The preceding subject matter of this paragraph characterizes Example 100 of the present disclosure, which also includes the subject matter of any one of Examples 80-99 above.

[0107] The discrete masses of polymeric material are at least 150 mm 2 The preceding subject matter of this paragraph characterizes Example 101 of the present disclosure, which also includes the subject matter of Example 100 above.

[0108] The discrete masses of polymeric material are at least 225 mm 2 The preceding subject matter of this paragraph characterizes Example 102 of the present disclosure, which also includes the subject matter of Example 101 above.

[0109] The golf club head further includes a plurality of reinforcements, the discrete masses of polymeric material of one of the plurality of reinforcements contacting a surface region of the face portion that is different from a surface region of the discrete masses of polymeric material of another of the plurality of reinforcements. The preceding subject matter of this paragraph characterizes Example 103 of the present disclosure, which also includes the subject matter of any one of Examples 80-102 above.

[0110] The golf club head further includes a plurality of reinforcements, the discrete masses of polymeric material of the plurality of reinforcements having a total mass of at least 100 mm. 2The preceding subject matter of this paragraph characterizes Example 104 of the present disclosure, which also includes the subject matter of any one of Examples 80-103 above.

[0111] The discrete masses of polymeric material of the multiple reinforcements must be at least 800 mm in total. 2 The preceding subject matter of this paragraph characterizes Example 105 of the present disclosure, which also includes the subject matter of Example 104 above.

[0112] The discrete masses of polymeric material contact a surface area of ​​the face portion. A ratio of the surface area of ​​the face portion contacted by the discrete masses of polymeric material to the total interior surface area of ​​the face portion is at least 0.01. The preceding subject matter of this paragraph characterizes Example 106 of the present disclosure, which also includes the subject matter of any one of Examples 80-105 above.

[0113] The ratio of the surface area of ​​the face portion contacted by the discrete masses of polymeric material to the total interior surface area of ​​the face portion is at least 0.05. The preceding subject matter of this paragraph characterizes Example 107 of the present disclosure, which also includes the subject matter of Example 106 above.

[0114] The ratio of the surface area of ​​the face portion contacted by the discrete masses of polymeric material to the total interior surface area of ​​the face portion is at least 0.1. The preceding subject matter of this paragraph characterizes Example 108 of the present disclosure, which also includes the subject matter of Example 107 above.

[0115] The at least one reinforcement further comprises a foam. The discrete masses of polymeric material are supported on the foam. The foam and the discrete masses of polymeric material are disposed at a bottom region of the golf club head. The golf club head further comprises at least one additional reinforcement comprising a rib directly bonded to the face portion at a top region of the golf club head. A ratio of the height of the rib to the height of the face portion is equal to or greater than 0.15. The preceding subject matter of this paragraph characterizes Example 109 of the present disclosure, which also includes the subject matter according to any one of Examples 80-108 above.

[0116] Also disclosed herein is a golf club head including a body and a face portion. The body defines an internal cavity and includes a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head, a skirt portion disposed around the golf club head between the sole portion and the crown portion, a forward region, a rear region opposite the forward region, a heel region, and a toe region opposite the heel region. The face portion is coupled to the body at the forward region of the body and includes a striking plate. The golf club head further includes at least one reinforcement including foam and discrete masses of polymeric material within the internal cavity and supported on the foam, the discrete masses being directly bonded to the face portion. The foregoing subject matter of this paragraph characterizes an example 110 of the present disclosure.

[0117] Also disclosed herein is a golf club head including a body and a face portion. The body defines an internal cavity and includes a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head, a skirt portion disposed around the golf club head between the sole portion and the crown portion, a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the front region of the body and including a striking plate. The golf club head further includes at least one stiffener at least partially within the internal cavity and including a fastener adjustably coupled to the body. The fastener is adjustable to stiffen the face portion. The foregoing subject matter of this paragraph characterizes Example 111 of the present disclosure.

[0118] The entire fastener is within the internal cavity. The preceding subject matter of this paragraph characterizes Example 112 of the present disclosure, which also includes the subject matter of Example 111 above.

[0119] The golf club head includes a port formed in the body. The fastener is accessible by a tool through the port. The preceding subject matter of this paragraph characterizes Example 113 of the present disclosure, which also includes the subject matter of any one of Examples 111-112 above.

[0120] The fastener includes an end surface. The fastener is adjustable to bring the face into contact with the end surface of the fastener. The end surface is rounded. The preceding subject matter of this paragraph characterizes Example 114 of the present disclosure, which also includes subject matter according to any one of Examples 111-113 above.

[0121] The at least one reinforcement further includes a fastener rib. The fastener rib includes a threaded hole. The fastener extends through and threadably engages the threaded hole of the fastener rib. The preceding subject matter of this paragraph characterizes Example 115 of the present disclosure, which also includes subject matter according to any one of Examples 111-114 above.

[0122] The at least one stiffener further includes a spring element including an opening and a washer including an opening. The spring element is disposed between the fastener rib and the washer. The fastener extends through the opening in the spring element and the opening in the washer. The preceding subject matter of this paragraph characterizes Example 116 of the present disclosure, which also includes the subject matter of Example 115 above.

[0123] The spring element is made of a polymeric material. The preceding subject matter of this paragraph characterizes Example 117 of the present disclosure, which also includes the subject matter of Example 116 above.

[0124] The golf club head includes a threaded port formed in the body. The fastener threadably engages with the threaded port. The preceding subject matter of this paragraph characterizes Example 118 of the present disclosure, which also includes the subject matter of any one of Examples 111-117 above.

[0125] Further disclosed herein is a method for adjusting a characteristic time (CT) of a golf club head after manufacturing the golf club head, the method including adjusting at least one reinforcement at least partially within an internal cavity of the golf club head and directly bondable to a face portion of the golf club head. Adjusting the at least one reinforcement includes at least one of: removing material from the at least one reinforcement through a hole in the golf club head, the at least one reinforcement including a rib; adding a polymeric material having a hardness of about Shore 10D or greater to the at least one reinforcement through a port formed in the golf club head; or adjusting a fastener at least partially within the internal cavity to contact or be in contact with a face portion of the golf club head. The foregoing subject matter of this paragraph characterizes Example 119 of the present disclosure.

[0126] A plurality of golf club heads, each of which includes a body and a face portion. The body defines an internal cavity. The body further includes a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head (the entire outer surface of the crown portion is convex), and a skirt portion disposed around the periphery of the golf club head between the sole portion and the crown portion. The body further includes a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The face portion is coupled to the body at the front region of the body and includes a striking plate. A characteristic time (CT) of each of the golf club heads at a center face of the striking plate, at a first location on the striking plate 20 millimeters (mm) away from the center face toward the toe region, and at a second location on the striking plate 20 millimeters (mm) away from the center face toward the heel region is within a standard deviation of 2 microseconds of a desired CT, which is predetermined prior to manufacturing of the golf club heads. The foregoing subject matter of this paragraph characterizes an example 120 of the present disclosure.

[0127] The desired CT is between 235 microseconds and 257 microseconds. The preceding subject matter of this paragraph characterizes Example 121 of the present disclosure, which also includes the subject matter of Example 120 above.

[0128] The desired CT is between 240 and 250 microseconds. The preceding subject matter of this paragraph characterizes Example 122 of the present disclosure, which also includes the subject matter of Example 121 above.

[0129] The desired CT is 247 microseconds. The preceding subject matter of this paragraph characterizes Example 123 of the present disclosure, which also includes the subject matter of Example 122 above.

[0130] Each golf club head includes at least one stiffener located at least partially within the internal cavity and directly bondable to the face portion at discrete locations. The at least one stiffener is configured to selectively adjust the CT of the striking plate proximate discrete locations of the face portion after manufacturing the golf club head such that the CT at the center face of the striking plate, at a first location on the striking plate 20 millimeters away from the center face toward the toe region, and at a second location on the striking plate 20 millimeters away from the center face toward the heel region is within a standard deviation of 2 microseconds of a target CT. The preceding subject matter of this paragraph characterizes Example 124 of the present disclosure, which also includes the subject matter of any one of Examples 120-123 above.

[0131] The entire exterior surface of the crown portion is convex. The preceding subject matter of this paragraph characterizes Example 125 of the present disclosure, which also includes the subject matter of any one of Examples 62-118 and 120-124 above.

[0132] The striking plate has an area of ​​at least 3500 mm^2 and a maximum height above the ground of at least about 50 mm. The preceding subject matter of this paragraph characterizes Example 126 of the present disclosure, which also includes the subject matter of any one of Examples 62-118 and 120-125 above.

[0133] The volume of a golf club head is at least about 370 cm 3 The preceding subject matter of this paragraph characterizes Example 127 of the present disclosure, which also includes the subject matter of any one of Examples 62-118 and 120-126 above.

[0134] The crown portion of the body is made from a first material and at least one of the sole portion or the skirt portion of the body is made from a second material different from the first material, and the crown portion is bonded to the skirt portion. The preceding subject matter of this paragraph characterizes Example 128 of the present disclosure, which also includes subject matter according to any one of Examples 62-118 and 120-127 above.

[0135] Disclosed herein is a golf club head including a body. The body defines an internal cavity. The body also includes a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head, a skirt portion disposed around the golf club head between the sole portion and the crown portion, a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the front region of the body. The face portion has a bulge radius of 190 mm to 600 mm and a roll radius of 100 mm to 600 mm. The golf club head further includes a first wall extending upright from the sole portion and longitudinally in a heel-toe direction, the first wall being made of a first material having a first modulus of elasticity of 15 GPa to 350 GPa. The golf club head further includes a reinforcement disposed within the internal cavity of the body and disposed between an inner surface of the face portion and the first wall. The reinforcement is made of a second material having a second modulus of elasticity less than the first modulus of elasticity, the second modulus of elasticity being between 0.5 GPa and 30 GPa, and the second material having a hardness of at least Shore 5.95D. The golf club head has a coefficient of restitution (COR) of at least 0.78. The golf club head has a characteristic time (CT) at the center of the face portion of 257 microseconds or less. The foregoing subject matter of this paragraph characterizes Example 129 of the present disclosure.

[0136] The inner surface of the face portion includes a continuous bead about a center of the face portion. The thickness of the face portion at the continuous bead is greater than the thickness at a portion of the face portion immediately adjacent to the continuous bead. The reinforcement extends from the inner surface of the body to at least the continuous bead. The preceding subject matter of this paragraph characterizes Example 130 of the present disclosure, which also includes the subject matter of Example 129 above.

[0137] The reinforcing material directly contacts the continuous beads. The preceding subject matter of this paragraph characterizes Example 131 of the present disclosure, which also includes the subject matter of Example 130 above.

[0138] The reinforcement directly contacts the inner surface of the face portion. The preceding subject matter of this paragraph characterizes Example 132 of the present disclosure, which also includes the subject matter of any one of Examples 129-131 above.

[0139] The golf club head further includes a second wall extending upright from the sole portion, generally longitudinally in the fore-aft direction, and made of a third material having a third modulus of elasticity less than the first modulus of elasticity. The second modulus of elasticity is greater than the third modulus of elasticity. The reinforcement abuts the second wall. The preceding subject matter of this paragraph characterizes Example 133 of the present disclosure, which also includes subject matter according to any one of Examples 129-132 above.

[0140] The third elastic modulus is between 0.01 GPa and 8.0 GPa. The preceding subject matter of this paragraph characterizes Example 134 of the present disclosure, which also includes the subject matter of Example 133 above.

[0141] The golf club head further includes a third wall extending upright from the sole portion and generally longitudinally in the fore-aft direction spaced apart from the second wall in a direction parallel to the heel-toe direction and made of a third material. The reinforcement abuts the third wall and is disposed between the second wall and the third wall. The preceding subject matter of this paragraph characterizes Example 135 of the present disclosure, which also includes subject matter according to any one of Examples 133-134 above.

[0142] The third elastic modulus is between 0.01 GPa and 8.0 GPa. The preceding subject matter of this paragraph characterizes Example 136 of the present disclosure, which also includes the subject matter of Example 135 above.

[0143] The second wall abuts the inner surface of the face portion and the first wall. The third wall abuts the inner surface of the face portion and the first wall. The reinforcement abuts the first wall, the second wall, and the third wall. The preceding subject matter of this paragraph characterizes Example 137 of the present disclosure, which also includes subject matter according to any one of Examples 135-136 above.

[0144] The first material is one of titanium or steel. The second material is foam. The third material is acrylic. The preceding subject matter of this paragraph characterizes Example 138 of the present disclosure, which also includes the subject matter of any one of Examples 135-137 above.

[0145] The first wall, the second wall, the third wall, and the stiffener comprise a stiffener assembly. The stiffener assembly is disposed in a toe direction or a heel direction from a center of the face portion. The preceding subject matter of this paragraph characterizes Example 139 of the present disclosure, which also includes the subject matter of any one of Examples 135-138 above.

[0146] The golf club head further includes a plurality of stiffener assemblies disposed in a toe direction or a heel direction from the center of the face portion, respectively. The preceding subject matter of this paragraph characterizes Example 140 of the present disclosure, which also includes the subject matter of Example 139 above.

[0147] The maximum height of the reinforcement is less than the maximum height of the first wall, the maximum height of the second wall, and the maximum height of the third wall. The preceding subject matter of this paragraph characterizes Example 141 of the present disclosure, which also includes the subject matter of any one of Examples 135-140 above.

[0148] The first wall extends longitudinally, generally in a heel-toe direction, for less than the entire length of the entire section of the face portion adjacent the sole portion of the body. The reinforcement extends longitudinally, parallel to the heel-toe direction, for less than the entire length of the entire section of the face portion adjacent the sole portion of the body. The entire length of the reinforcement is less than or equal to the entire length of the first wall. The preceding subject matter of this paragraph characterizes Example 142 of the present disclosure, which also includes subject matter according to any one of Examples 129-141 above.

[0149] The first wall and the reinforcement are disposed along the yz plane of the head origin coordinate system of the golf club head. The preceding subject matter of this paragraph characterizes Example 143 of the present disclosure, which also includes the subject matter of Example 142 above.

[0150] The golf club head further includes a slot formed in the sole portion of the body and extending longitudinally parallel to the heel-toe direction. The first wall forms a front-most sidewall of the slot. The preceding subject matter of this paragraph characterizes Example 144 of the present disclosure, which also includes subject matter according to any one of Examples 129-143 above.

[0151] The slot extends the entire length of the entire section of the face portion adjacent the sole portion of the body. The reinforcement extends longitudinally, parallel to the heel-toe direction, for less than the entire length of the entire section of the face portion adjacent the sole portion of the body. The preceding subject matter of this paragraph characterizes Example 145 of the present disclosure, which also includes the subject matter of Example 144 above.

[0152] The body and face are integral to form a single monolithic structure. The preceding subject matter of this paragraph characterizes Example 146 of the present disclosure, which also includes the subject matter of any one of Examples 129-145 above.

[0153] The face portion has a face opening and a striking plate welded to the face opening. The preceding subject matter of this paragraph characterizes Example 147 of the present disclosure, which also includes the subject matter of any one of Examples 129-146 above.

[0154] The maximum height of the reinforcement is less than the maximum height of the first wall. The preceding subject matter of this paragraph characterizes Example 148 of the present disclosure, which also includes the subject matter of any one of Examples 129-147 above.

[0155] Further disclosed herein is a golf club head including a body. The body partially defines an interior cavity of the golf club head. The body also includes a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head, a skirt portion disposed around the golf club head between the sole portion and the crown portion, a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the front region of the body. The face portion includes an inner surface partially defines the interior cavity. The golf club head further includes a slot formed in the sole portion of the body and extending longitudinally generally in a heel-toe direction. The golf club head further includes a stiffener secured and retained within the slot and in direct contact with the inner surface of the face portion. The foregoing subject matter of this paragraph characterizes Example 149 of the present disclosure.

[0156] The stiffener is in press-fit engagement with the slot. The preceding subject matter of this paragraph characterizes Example 150 of the present disclosure, which also includes the subject matter of Example 149 above.

[0157] The golf club head further includes a retaining wall coupled to an inner surface of the sole portion. The retaining wall is angled toward the face portion. The retaining wall defines a rear wall of the slot. The stiffener is in press-fit engagement with the retaining wall. The preceding subject matter of this paragraph characterizes Example 151 of the present disclosure, which also includes subject matter according to Example 150 above.

[0158] The overall length of the reinforcement is less than the overall length of the channel of the insert.The preceding subject matter of this paragraph characterizes Example 152 of the present disclosure, which also includes the subject matter of any one of Examples 149-151 above.

[0159] The reinforcement is located on the toe side or heel side from the center of the face portion. The preceding subject matter of this paragraph characterizes Example 153 of the present disclosure, which also includes the subject matter of any one of Examples 149-152 above.

[0160] The stiffener is selectively removable from the slot.The preceding subject matter of this paragraph characterizes Example 154 of the present disclosure, which also includes the subject matter of any one of Examples 149-153 above.

[0161] The golf club head further includes a plurality of stiffeners secured and held within the slots in spaced relation to one another. The preceding subject matter of this paragraph characterizes Example 155 of the present disclosure, which also includes the subject matter of any one of Examples 149-154 above.

[0162] Further disclosed herein is a golf club head. The golf club head includes a body that partially defines an internal cavity of the golf club head. The golf club head includes a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head, a skirt portion disposed around the golf club head between the sole portion and the crown portion, a front region, a rear region opposite the front region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the front region of the body. The face portion includes an inner surface that partially defines the internal cavity. The golf club head further includes a slot formed in the sole portion of the body and extending longitudinally generally in a heel-toe direction. The golf club head further includes an insert that includes a channel. The insert is secured and retained within the slot. The golf club head also includes a stiffener secured and retained within the channel of the insert. The foregoing subject matter of this paragraph characterizes Example 156 of the present disclosure.

[0163] The insert includes a front opening and a rear opening opposite the front opening. The stiffener includes a front extending tab and a rear extending tab opposite the front extending tab. The front extending tab passes through the front opening of the insert and directly contacts the front wall of the slot. The rear extending tab passes through the rear opening of the insert and directly contacts the rear wall of the slot. The preceding subject matter of this paragraph characterizes Example 157 of the present disclosure, which also includes subject matter according to Example 156 above.

[0164] The slot is made of a first material having a first modulus of elasticity. The insert is made of a second material having a second modulus of elasticity. The reinforcement is made of a third material having a third modulus of elasticity. The third modulus of elasticity is higher than the second modulus of elasticity and lower than the first modulus of elasticity. The preceding subject matter of this paragraph characterizes Example 158 of the present disclosure, which also includes subject matter according to any one of Examples 156-157 above.

[0165] The slot includes an open end that is open to the interior cavity of the body. The insert seals the open end of the slot. The preceding subject matter of this paragraph characterizes Example 159 of the present disclosure, which also includes the subject matter of any one of Examples 156-158 above.

[0166] The overall length of the reinforcement is less than the overall length of the channel of the insert.The preceding subject matter of this paragraph characterizes Example 160 of the present disclosure, which also includes the subject matter of any one of Examples 156-159 above.

[0167] The reinforcement is located on the toe side or heel side from the center of the face portion. The preceding subject matter of this paragraph characterizes Example 161 of the present disclosure, which also includes the subject matter of any one of Examples 156-160 above.

[0168] The stiffener is selectively removable from the slot.The preceding subject matter of this paragraph characterizes Example 162 of the present disclosure, which also includes the subject matter of any one of Examples 156-161 above.

[0169] The golf club head further includes a plurality of stiffeners secured and held within the slots in spaced relation to one another. The preceding subject matter of this paragraph characterizes Example 163 of the present disclosure, which also includes the subject matter of any one of Examples 156-162 above.

[0170] Also disclosed herein is a method of adjusting one or more characteristic times of a golf club head. The method includes measuring a first measured characteristic time (CT) value of a face portion of the golf club head. The golf club head includes a body defining an interior cavity and including a sole portion disposed at a bottom region of the golf club head, a crown portion disposed at a top region of the golf club head, a skirt portion disposed around the golf club head between the sole portion and the crown portion, a forward region, a rear region opposite the forward region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the forward region of the body. The golf club head further includes a slot formed in the sole portion of the body and extending longitudinally generally in a heel-toe direction. The golf club head further includes a first stiffener secured and retained within the slot. The method also includes adjusting the CT of the golf club head by removing the first stiffener from the slot after the first CT measurement is measured and securing and retaining a second stiffener different from the first stiffener within the slot. The preceding subject matter of this paragraph characterizes Example 164 of the present disclosure.

[0171] The second reinforcement has a higher modulus of elasticity than the modulus of elasticity of the first reinforcement. Adjusting the CT of the golf club head includes reducing the CT of the golf club head. The preceding subject matter of this paragraph characterizes Example 165 of the present disclosure, which also includes the subject matter of Example 164 above.

[0172] The second reinforcement is larger than the first reinforcement. Adjusting the CT of the golf club head includes decreasing the CT of the golf club head. The preceding subject matter of this paragraph characterizes Example 166 of the present disclosure, which also includes the subject matter of any one of Examples 164-165 above.

[0173] The golf club head further includes an insert secured and retained in the slot, the insert including a channel. A first stiffener is secured and retained in the channel of the insert. The CT of the golf club head is further adjusted by removing the insert from the slot, removing the first stiffener from the channel of the insert, securing and retaining a second stiffener in the channel of the insert, and securing and retaining the insert in the slot with the second stiffener secured and retained in the slot within the channel of the insert. The preceding subject matter of this paragraph characterizes Example 167 of the present disclosure, which also includes subject matter according to any one of Examples 164-166 above.

[0174] Further disclosed herein is a golf club head. The golf club head includes a body defining an internal cavity and including a sole portion disposed at a bottom region of the golf club head, the sole portion having a sole surface region. The body also includes a crown portion disposed at a top region of the golf club head, the crown portion having a crown surface region. The body further includes a skirt portion disposed around the periphery of the golf club head between the sole portion and the crown portion. The body further includes a forward region, a rear region opposite the forward region, a heel region, and a toe region opposite the heel region. The golf club head also includes a face portion coupled to the body at the forward region of the body and including a striking face and an inner surface opposite the striking face. The face portion has a different thickness. The crown portion of the golf club head has an areal weight of about 0.35 g / cm over about 50% or more of the total surface area of ​​the crown portion. 2 The weight per area of ​​the sole of the golf club head is less than about 0.35 g / cm over at least about 50% of the total surface area of ​​the sole. 2The striking face has a central region defined by a 40 millimeter by 20 millimeter rectangular region centered on the center of the striking face and elongated in a heel-toe direction. Within the central region, the maximum thickness of the face portion is 5 mm or less and the minimum thickness of the face portion is 2.4 mm or more. Within the central region, the striking face has a characteristic time (CT) of 257 microseconds or less. Within the central region, 25% or more of the striking face has a coefficient of restitution (COR) of at least 0.8. Within the central region, 60% or more of the striking face has a CT of at least 235 microseconds. Within the central region, 50% or more of the striking face has a CT of at least 240 microseconds. The foregoing subject matter of this paragraph characterizes Example 168 of the present disclosure.

[0175] More than 20% of the striking face has a CT of at least 245 microseconds.The preceding subject matter of this paragraph characterizes Example 169 of the present disclosure, which also includes the subject matter of Example 168 above.

[0176] At least 60% of the striking face in the central region has a CT of at least 240 microseconds.The preceding subject matter of this paragraph characterizes Example 170 of the present disclosure, which also includes the subject matter of any one of Examples 168-169 above.

[0177] At least 40% of the striking face in the central region has a CT of at least 245 microseconds. The preceding subject matter of this paragraph characterizes Example 171 of the present disclosure, which also includes the subject matter of any one of Examples 168-170 above.

[0178] At least 10% of the striking face in the central region has a CT of at least 250 microseconds.The preceding subject matter of this paragraph characterizes Example 172 of the present disclosure, which also includes the subject matter of any one of Examples 168-171 above.

[0179] The CT at any location on the striking face within at least 5 millimeters of the center of the striking face is greater than 240 microseconds. The preceding subject matter of this paragraph characterizes Example 173 of the present disclosure, which also includes the subject matter of any one of Examples 168-172 above.

[0180] The golf club head has a center of gravity (CG) having a head center face origin x-axis coordinate of about -5 mm to about 5 mm, a head center face origin y-axis coordinate of about 25 mm to about 50 mm, and a center face head origin z-axis coordinate of less than 2 mm. The preceding subject matter of this paragraph characterizes Example 174 of the present disclosure, which also includes the subject matter of any one of Examples 168-173 above.

[0181] The golf club head is about 350 cm 3 ~about 500cm 3 The golf club has a volume of 1.5 mm, a moment of inertia (Izz) about the z-axis of the head center of gravity, and a moment of inertia (Ixx) about the x-axis of the head center of gravity. The preceding subject matter of this paragraph characterizes Example 175 of the present disclosure, which also includes the subject matter of any one of Examples 168-174 above.

[0182] The sum of Izz and Ixx is approximately 740kg mm 2 ~1100kg・mm 2 The preceding subject matter of this paragraph characterizes Example 176 of the present disclosure, which also includes the subject matter of Example 175 above.

[0183] The golf club head further includes a stiffener disposed within the internal cavity of the body and in direct contact with the inner surface of the face portion. The stiffener is made of a material having a hardness of at least Shore 5.95 D. The preceding subject matter of this paragraph characterizes Example 177 of the present disclosure, which also includes the subject matter of any one of Examples 168-176 above.

[0184] The golf club head further includes a plurality of stiffeners disposed within the interior cavity of the body and in direct contact with the inner surface of the face portion. The plurality of stiffeners are a plurality of ribs made of the same material as the body. The preceding subject matter of this paragraph characterizes Example 178 of the present disclosure, which also includes the subject matter of any one of Examples 168-177 above.

[0185] The plurality of ribs are disposed proximate the transition between the face portion and the crown portion. The preceding subject matter of this paragraph characterizes Example 179 of the present disclosure, which also includes the subject matter of Example 178 above.

[0186] At least one of the plurality of ribs has a head origin x-axis coordinate between +15 mm and +25 mm, and at least one of the plurality of ribs has a head origin x-axis coordinate between -15 mm and -25 mm. The preceding subject matter of this paragraph characterizes Example 180 of the present disclosure, which also includes the subject matter of any one of Examples 178-179 above.

[0187] The golf club head further includes a plurality of reinforcements disposed within the internal cavity of the body and offset from the inner surface of the face portion by at least 1 mm and no more than 20 mm as measured along a head origin y-axis. The plurality of reinforcements are elongated reinforcing members extending between the inner surface of the crown portion and the inner surface of the sole portion. The preceding subject matter of this paragraph characterizes Example 181 of the present disclosure, which also includes subject matter according to any one of Examples 168-180 above.

[0188] The plurality of stiffeners includes two or more brace bars. The two or more brace bars each have a mass per unit length of 0.005 g / mm to 0.40 g / mm. The preceding subject matter of this paragraph characterizes Example 182 of the present disclosure, which also includes the subject matter of Example 181 above.

[0189] At least one of the plurality of reinforcements has a head origin x-axis coordinate of +15mm to +25mm, and at least one of the plurality of reinforcements has a head origin x-axis coordinate of -15mm to -25mm. The preceding subject matter of this paragraph characterizes Example 183 of the present disclosure, which also includes the subject matter of any one of Examples 181-182 above.

[0190] The maximum thickness of the face portion is 4 mm or less.The preceding subject matter of this paragraph characterizes Example 184 of the present disclosure, which also includes the subject matter of any one of Examples 168-183 above.

[0191] The minimum thickness of the face portion is less than 3 mm.The preceding subject matter of this paragraph characterizes Example 185 of the present disclosure, which also includes the subject matter of any one of Examples 168-184 above.

[0192] The body and face are integral to form a single monolithic structure. The preceding subject matter of this paragraph characterizes Example 186 of the present disclosure, which also includes the subject matter of any one of Examples 168-185 above.

[0193] The face portion includes a face opening and a striking plate welded to the face opening. The preceding subject matter of this paragraph characterizes Example 187 of the present disclosure, which also includes the subject matter of any one of Examples 168-186 above.

[0194] The golf club head further includes a first wall extending upright from the sole portion and extending longitudinally in a heel-toe direction and made of a first material having a first modulus of elasticity between 15 GPa and 350 GPa. The golf club head also includes a reinforcement disposed within the interior cavity of the body and disposed between the inner surface of the face portion and the first wall. The reinforcement is made of a second material having a second modulus of elasticity less than the first modulus of elasticity, the second modulus of elasticity being between 0.5 GPa and 30 GPa, the second material having a hardness of at least Shore 5.95D, and the reinforcement directly contacts the inner surface of the face portion. The preceding subject matter of this paragraph characterizes Example 188 of the present disclosure, which also includes subject matter according to any one of Examples 168-187 above.

[0195] The golf club head further includes a second wall extending upright from the sole portion, generally longitudinally in the fore-aft direction, and made of a third material having a third modulus of elasticity less than the first modulus of elasticity. The second modulus of elasticity is greater than the third modulus of elasticity. The reinforcement abuts the second wall. The golf club head further includes a third wall extending upright from the sole portion, generally longitudinally in the fore-aft direction, spaced apart from the second wall in a direction parallel to the heel-toe direction, and made of a third material. The reinforcement abuts the third wall and is disposed between the second wall and the third wall. The preceding subject matter of this paragraph characterizes Example 189 of the present disclosure, which also includes subject matter according to Example 188 above.

[0196] The first material is one of titanium or steel. The second material is foam. The third material is acrylic. The preceding subject matter of this paragraph characterizes Example 190 of the present disclosure, which also includes subject matter according to Example 189 above.

[0197] The described features, structures, advantages, and / or characteristics of the presently disclosed subject matter may be combined in any suitable manner in one or more embodiments and / or implementations. In the following description, numerous specific details are provided to provide a thorough understanding of the embodiments of the presently disclosed subject matter. Those skilled in the art will understand that the presently disclosed subject matter may be practiced without one or more of the specific features, details, components, materials, and / or methods of a particular embodiment or implementation. In other instances, a particular embodiment and / or implementation may recognize additional features and advantages that may not be present in all embodiments or implementations. Moreover, in some instances, well-known structures, materials, or operations have not been shown or described in detail to avoid obscuring aspects of the presently disclosed subject matter. The features and advantages of the presently disclosed subject matter will become more fully apparent from the following description and appended claims, or may be learned by practice of the subject matter as set forth below. [Brief description of the drawings]

[0198] So that the advantages of the subject matter may be more readily understood, a more particular description of the subject matter briefly described above will be given by reference to specific embodiments which are illustrated in the accompanying drawings, the subject matter being described and explained with additional specificity and detail using the drawings, with the understanding that these drawings depict only typical embodiments of the subject matter and therefore should not be considered as limiting the scope of the subject matter.

[0199] [Figure 1] FIG. 1 is a perspective view of a golf club head from the bottom of the golf club head according to one or more examples of the present disclosure. [Diagram 2] FIG. 2 is a perspective view of a golf club head from the rear of the golf club head according to one or more examples of the present disclosure. [Diagram 3] FIG. 3 is an exploded perspective view of a golf club head from the top of the golf club head according to one or more examples of the present disclosure. [Figure 4]FIG. 4 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with the crown insert of the golf club head removed in accordance with one or more examples of the present disclosure. [Diagram 5] FIG. 5 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 6] FIG. 6 is a cross-sectional rear view of a golf club head taken along a line similar to line 2-2 in FIG. 1 according to one or more examples of the present disclosure. [Figure 7] FIG. 7 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with the crown insert of the golf club head removed in accordance with one or more examples of the present disclosure. [Figure 8] FIG. 8 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 9] FIG. 9 is a cross-sectional rear view of a golf club head taken along a line similar to line 2-2 in FIG. 1 according to one or more examples of the present disclosure. [Figure 10] FIG. 10 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with the crown insert of the golf club head removed in accordance with one or more examples of the present disclosure. [Figure 11] FIG. 11 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 12] FIG. 12 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 13]FIG. 13 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with the crown insert of the golf club head removed in accordance with one or more examples of the present disclosure. [Figure 14] FIG. 14 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 15] FIG. 15 is a cross-sectional rear view of a golf club head taken along a line similar to line 2-2 in FIG. 1 according to one or more examples of the present disclosure. [Figure 16] FIG. 16 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with the crown insert of the golf club head removed in accordance with one or more examples of the present disclosure. [Figure 17] FIG. 17 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 18] FIG. 18 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 19] FIG. 19 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with the crown insert of the golf club head removed in accordance with one or more examples of the present disclosure. [Figure 20] FIG. 20 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 21] FIG. 21 is a cross-sectional rear view of a golf club head taken along a line similar to line 2-2 in FIG. 1 according to one or more examples of the present disclosure. [Figure 22]FIG. 22 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with the crown insert of the golf club head removed in accordance with one or more examples of the present disclosure. [Figure 23] FIG. 23 is a cross-sectional rear view of a golf club head taken along a line similar to line 2-2 in FIG. 1 according to one or more examples of the present disclosure. [Figure 24] FIG. 24 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Diagram 25] FIG. 25 is a cross-sectional rear view of a golf club head taken along a line similar to line 2-2 in FIG. 1 according to one or more examples of the present disclosure. [Figure 26] FIG. 26 is a cross-sectional plan view of a golf club head taken along a line similar to line 3-3 of FIG. 5 according to one or more examples of the present disclosure. [Figure 27] FIG. 27 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 28] FIG. 28 is a perspective view of a golf club according to one or more examples of the present disclosure. [Figure 29] FIG. 29 is a schematic flow diagram of a method for adjusting a characteristic time (CT) of a golf club head after the golf club head is fully manufactured, in accordance with one or more examples of the present disclosure. [Diagram 30] FIG. 30 is a front view of a golf club head according to one or more examples of the present disclosure. [Figure 31A] FIG. 31A is a cross-sectional front view of a golf club head taken along a line similar to line 31-31 of FIG. 2 according to one or more examples of the present disclosure. [Figure 31B] FIG. 31B is a cross-sectional front view of a golf club head taken along a line similar to line 31-31 of FIG. 2 according to one or more examples of the present disclosure. [Figure 31C]FIG. 31C is a cross-sectional front view of a golf club head taken along a line similar to line 31-31 of FIG. 2 according to one or more examples of the present disclosure. [Figure 32A] FIG. 32A is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 32B] 32B is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Diagram 33] FIG. 33 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with a portion of the top of the golf club head removed in accordance with one or more examples of the present disclosure. [Diagram 34] FIG. 34 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Diagram 35] FIG. 35 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Diagram 36] FIG. 36 is a cross-sectional perspective view of a golf club head taken from a side of the golf club head along a line similar to line 1-1 in FIG. 2 with a portion of the top of the golf club head removed in accordance with one or more examples of the present disclosure. [Figure 37] FIG. 37 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 38] FIG. 38 is a perspective view of a golf club head from the bottom of the golf club head in accordance with one or more examples of the present disclosure. [Figure 39] FIG. 39 is an exploded perspective view of a golf club head from the bottom of the golf club head in accordance with one or more examples of the present disclosure. [Diagram 40]FIG. 40 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Figure 41A] FIG. 41A is a cross-sectional side view of a face-sole transition region of a golf club head taken along a line similar to line 1-1 of FIG. 2 according to one or more examples of the present disclosure. [Figure 41B] FIG. 41B is a cross-sectional side view of a face-sole transition region of a golf club head taken along a line similar to line 1-1 of FIG. 2 according to one or more examples of the present disclosure. [Diagram 42] FIG. 42 is a cross-sectional top view of a golf club head taken along a line similar to line 3-3 in FIG. 5 according to one or more examples of the present disclosure. [Diagram 43] FIG. 43 is a cross-sectional top view of a golf club head taken along a line similar to line 3-3 of FIG. 5 according to one or more examples of the present disclosure. [Diagram 44] FIG. 44 is a cross-sectional side view of a golf club head taken along a line similar to line 1-1 in FIG. 2 according to one or more examples of the present disclosure. [Diagram 45] FIG. 45 is a cross-sectional top view of a golf club head taken along a line similar to line 3-3 in FIG. 5 according to one or more examples of the present disclosure. [Figure 46] FIG. 46 is a front view of a golf club head according to one or more examples of the present disclosure. [Figure 47] FIG. 47 is a graph illustrating characteristic time (CT) values ​​within a central region of a striking face of a golf club head in accordance with one or more examples of the present disclosure. [Figure 48] FIG. 48 is a graph illustrating characteristic time (CT) values ​​within a central region of a striking face of a golf club head in accordance with one or more examples of the present disclosure. [Figure 49] FIG. 49 is a graph illustrating characteristic time (CT) values ​​along a horizontal path on a striking face that passes through the center of the striking face, in accordance with one or more examples of the present disclosure. [Figure 50]FIG. 50 is an exploded cross-sectional side view of a face portion of a golf club head according to one or more examples of the present disclosure. [Figure 51] FIG. 51 is a cross-sectional side view of the face portion of the golf club head of FIG. 50 according to one or more examples of the present disclosure. [Figure 52] FIG. 52 is a cross-sectional side view of a face portion of a golf club head according to one or more examples of the present disclosure. [Figure 53] FIG. 53 is a cross-sectional side view of a face portion of a golf club head according to one or more examples of the present disclosure. [Figure 54] FIG. 54 is a cross-sectional side view of a face portion of a golf club head according to one or more examples of the present disclosure. [Figure 55] FIG. 55 is a rear view of a face portion of a golf club head according to one or more examples of the present disclosure. [Figure 56] FIG. 56 is a rear view of a face portion of a golf club head according to one or more examples of the present disclosure. [Figure 57] FIG. 57 is a perspective view of the face portion of FIG. 56 according to one or more examples of the present disclosure. [Figure 58] FIG. 58 is a rear view of a face portion of a golf club head according to one or more examples of the present disclosure.

[0200] Detailed Description The following describes embodiments of golf club heads in the context of driver-type golf clubs, although the principles, methods and designs described may be applicable in whole or in part to fairway woods, utility clubs (also known as hybrid clubs), and the like.

[0201] U.S. Patent Application Publication No. 2014 / 0302946A1 ('946 App), published October 9, 2014, which is incorporated herein by reference in its entirety, describes a "reference position" similar to the address position that is used to measure various parameters discussed throughout this application. The address or reference position is based on the procedures set forth in "Procedure for Measuring the Club Head Size of Wood Clubs," Revision 1.0.0 (November 21, 2003) of the United States Golf Association and R&A Rules Limited. Unless otherwise indicated, all parameters are specified with the club head in the reference position.

[0202] Figures 5, 6, 8, 9, 11, 12, 14, 15, 17, 18, 20, 21, 23-25, and 27 are examples showing a club head in an address position, i.e., the club head is positioned so that the hosel axis is at a lie angle of 60 degrees relative to the ground and the club face is square to an imaginary target line. Positioning the golf club head 100 in a reference position, as shown in Figures 5, 6, 8, 9, 11, 12, 14, 15, 17, 18, 20, 21, 23-25, and 27, aids in using a club head origin coordinate system 185 to take various measurements. Additionally, USGA methodology may be used to measure various parameters described throughout this application, including head height, club head center of gravity (CG) location, and moments of inertia (MOI) about various axes.

[0203] For further details or clarity, the reader is referred to the measurement methods set forth in the '946 App and USGA procedures. In particular, however, the origins and axes used in this application are not necessarily aligned or oriented in the same manner as set forth in the '946 App or USGA procedures. Further details regarding locating the club head origin coordinate system 185 are provided below.

[0204] The golf club heads described herein may include driver-type golf club heads having a relatively large striking plate area of ​​at least 3500 mm^2, preferably at least 3800 mm^2, and even more preferably at least 3900 mm^2. Additionally, the driver-type golf club heads may include a center of gravity (CG) protrusion adjacent the center face that may be up to 3 mm above or below the center face, preferably 1 mm above or below the center face, as measured along the vertical axis (z-axis).

[0205] Further, the driver-type golf club head may have a relatively high moment of inertia about the z-axis of the head center of gravity, e.g., Izz>350 kg-mm^2, preferably Izz>400 kg-mm^2, and a relatively high moment of inertia about the x-axis of the head center of gravity, e.g., Ixx>200 kg-mm^2, preferably Ixx>250 kg-mm^2, and preferably a ratio of Ixx / Izz>0.55. For example, in one implementation, Ixx is 305 kg mm 2 or more, and in another implementation, Ixx is 320 kg mm 2 In some cases, the sum of Izz and Ixx is about 740 kg mm 2 ~1100kg・mm 2 In one example, the sum of Izz and Ixx is about 790 kg mm 2 In another example, the sum of Izz and Ixx is about 805 kg mm 2 Greater than.

[0206] The head center of gravity x-axis, head center of gravity y-axis, and head center of gravity z-axis that define the head center of gravity origin coordinate system are centered on the center of gravity of the golf club head. Furthermore, the head center of gravity x-axis, head center of gravity y-axis, and head center of gravity z-axis are parallel to the corresponding x-axis, y-axis, and z-axis of the club head origin coordinate system 185 as defined herein. The location of the center of gravity can be defined relative to a center face head origin coordinate system defined by the head center face origin x-axis, head center face origin y-axis, and head center face origin z-axis that are centered on the center face of the striking face of the golf club head. The head center face origin x-axis, head center face origin y-axis, and head center face origin z-axis are parallel to the corresponding x-axis, y-axis, and z-axis of the club head origin coordinate system 185 as defined herein. In some examples, the golf club head has a center of gravity (CG) with a head center face origin x-axis coordinate of about -5 mm to about 5 mm, a head center face origin y-axis coordinate of about 25 mm to about 50 mm, and a center face head origin z-axis coordinate of less than 2 mm.

[0207] 1 and 2, the golf club head 100 of the present disclosure includes a body 110. The body 110 has a toe region 114 and a heel region 116 opposite the toe region 114. The body 110 further includes a front region 112 and a rear region 118 opposite the front region 112. The body 110 further includes a face portion 142 in the front region 112 of the body 110. The body 110 of the golf club head 100 further includes a sole portion 117 in the bottom region 135 of the golf club head 100 and a crown portion 119 in the top region 133 of the golf club head 100 opposite the sole portion 117. The body 110 of the golf club head 100 also includes a skirt portion 121 that defines a transition region where the body 110 of the golf club head 100 transitions between the crown portion 119 and the sole portion 117. Thus, the skirt portion 121 is disposed between the crown portion 119 and the sole portion 117 and extends around the periphery of the golf club head 100. The face portion 142 extends along the forward region 112 from the sole portion 117 to the crown portion 119. Furthermore, the outer surface and at least a portion of the inner surface of the face portion 142 are planar in the vertical direction. As further defined, the face portion 142 is the portion of the body 110 in the forward region 112 having an outer surface that generally faces forward.

[0208] The face portion 142 includes a lip 147 and a striking plate 143 that defines a striking face 144. The lip 147 is circumferentially closed, defines a face opening, and extends around the periphery of the forward region 112 of the body 110. The lip 147 circumferentially surrounds the striking plate 143 and is integrally molded (e.g., unitarily forming a continuous monolithic structure) with the crown portion 119, skirt portion 121, and sole portion 117 of the body 110. The striking plate 143 defines a striking face that is configured to impact and propel a golf ball a long distance during a normal swing of the golf club head 100. Referring to FIG. 5, the striking plate 143 is attached to or integrally molded with the lip 147 to form the face portion 142 of the body 110. In one example, the striking plate 143 is attached to the lip 147 by fixedly attaching (e.g., welding) the striking plate 143 to the lip 147 or face opening. According to another example, the striking plate 143 is integrally molded (e.g., one piece) with the lip 147 by casting the striking plate 143 with the lip 147 and other portions of the body 110 to form a continuous monolithic structure integral with the body 110. For example, the striking face can be co-cast with the golf club head in a manner similar or identical to that shown and described in U.S. Patent Application Serial No. 16 / 161,337, filed October 16, 2018, which is incorporated herein by reference in its entirety.

[0209] When cast together, the striking plate 143, the lip 147, and the rest of the body 110 are made of the same material, such as any of a variety of materials described below. However, welding the striking plate 143 to the lip 147, rather than integrally molding the striking plate 143 and the lip 147 as a unitary structure, allows the striking plate 143 to be made of a different material, such as any of the materials described below, and / or by a different manufacturing process than the lip 147 and the rest of the body 110. According to certain implementations, the golf club head 100 includes a variable thickness face feature similar to those described in more detail in U.S. Patent Application Serial No. 12 / 006,060; and U.S. Patent Nos. 6,997,820; 6,800,038; and 6,824,475, which are incorporated herein by reference in their entireties. Within that central region, as defined below, face portion 142 has a maximum face thickness of 4.5 mm or less and a minimum face thickness of 2.0 mm or more in some instances. According to specific examples, the maximum face thickness is 5 mm or less and the minimum face thickness is less than 3 mm.

[0210] In some examples, the golf club head 100 includes a face portion 142 having a variable thickness face feature. According to one example, the variable thickness face feature of the face portion includes an inverted cone that protrudes from an inner surface 145 of the face portion 142 into the internal cavity of the golf club head 100. The inverted cone is centered on a center face of the face portion 142. In this example, the variable thickness face feature of the face portion 142 further includes a plurality of thickness zones spaced apart circumferentially around the inverted cone or center face of the face portion 142. Each of the thickness zones extends radially outward from the inverted cone toward the outer periphery of the face portion 142. In some implementations, one or more of the thickness zones terminate before the outer periphery of the face portion 142 and / or one or more of the thickness zones extend all the way to the outer periphery of the face portion 142. Additionally, each of the thickness zones defines a portion of the face portion 142 having a constant thickness. In other words, the thickness of the face portion 14 within a given one of the thickness zones is the same or does not vary. However, the thickness of the face portion 142 within one thickness zone differs from the thickness of an adjacent thickness zone. Thus, the thickness of the face portion 142 varies from thickness zone to thickness zone in the circumferential direction around the inverted cone.

[0211] According to one example, the multiple thickness zones include multiple high thickness zones and multiple low thickness zones. Each of the high thickness zones has a thickness greater than each of the high thickness zones. In some implementations, the thickness of each of the low thickness zones is greater than the minimum thickness of the face portion 142. The multiple high thickness zones and multiple low thickness zones are arranged alternating between the high thickness zones and the low thickness zones around the inverted cone 608.

[0212] FIG. 55 shows an exemplary backside of the face portion 600 of the golf club 100 disclosed herein. The face portion 142 may form part of the cast cup of the golf club head 100 as described in U.S. Patent Application No. 16 / 161,337, filed October 16, 2018, which is incorporated herein by reference in its entirety. The face portion 142 is viewed from the rear with the hosel / heel on the left and the toe on the right. FIGS. 56 and 57 show another exemplary face portion 700 having a variable thickness profile, and FIG. 58 shows yet another exemplary face portion 800 having a variable thickness profile. The face portions disclosed herein may be formed as a result of the casting process and any post-casting modifications to the face portion. Thus, the face portion may have a wide variety of novel thickness profiles. By casting the face into the desired shape, rather than forming the face plate from a flat rolled metal sheet in traditional processes, the face can be made in a wider variety of shapes and can have different material properties, such as different grain orientations and chemical impurity content, which can provide advantages in golf club performance and manufacturing.

[0213] In traditional processes, face plates are formed from flat metal sheets having a uniform thickness. Such metal sheets are typically rolled along one axis to reduce the thickness of the sheet to a constant uniform thickness. This rolling process imparts grain orientation in the sheet that produces different material properties along the rolling axis compared to a direction perpendicular to the rolling direction. This variation in material properties can be undesirable and can be avoided by using the disclosed casting method to produce the face portion instead.

[0214] Furthermore, because a conventional faceplate begins as a flat sheet of uniform thickness, the overall sheet thickness must be at least as thick as the maximum thickness of the desired final product faceplate, which means that much of the starting sheet material must be removed and wasted, increasing material costs. In contrast, in the disclosed casting method, the face portion is initially formed very close to its final shape and mass, resulting in much less material being removed and wasted. This saves time and cost.

[0215] Furthermore, in conventional processes, the initial flat metal sheet must be bent in a special process to impart the desired bulge and roll curvature to the faceplate. When using the disclosed casting method, such a bending step is not required.

[0216] The unique thickness profiles illustrated in Figures 55-59 are made possible using casting methods such as those disclosed in U.S. Patent Application Serial No. 16 / 161,337, and could not be achieved by conventional processes such as mounting a sheet on a lathe or similar machine and rotating the sheet to form a variable thickness profile across the rear of the faceplate. In such turning processes, the imparted thickness profile must be symmetric about a central axis of rotation, which limits the thickness profile to an arrangement of concentric rings each having a uniform thickness at any radius from the center point. On the other hand, more complex face shapes can be produced using the disclosed casting methods without such limitations.

[0217] By using a casting method, large numbers of the disclosed club heads can be manufactured faster and more efficiently: for example, 50 or more cups 402 can be cast simultaneously on a single casting tree, whereas creating new face thickness profiles on the face plate one at a time using a traditional slicing method using a lathe would take much longer and require more resources.

[0218] In FIG. 55, the rear or inner face surface of the face portion 600 includes an asymmetric variable thickness profile, illustrating just one example of the wide variety of variable thickness profiles made possible with the disclosed casting method. The center 602 of the face can have a center thickness, and the face thickness can gradually increase radially outward from the center across an inner blend zone 603 to a ring of maximum thickness 604, which can be circular. The face thickness can gradually decrease as one moves radially outward from the ring of maximum thickness 604 across a variable blend zone 606 to a second ring 608, which can be non-circular, such as elliptical. The face thickness can gradually decrease as one moves radially outward from the second ring 608 across an outer blend zone 609 to a heel and toe zone 610 of constant thickness (e.g., minimum thickness of the face portion) and / or to a radial peripheral zone 612 that defines the area of ​​the face portion 600 where the face transitions to other portions of the golf club head 100.

[0219] The second ring 608 may itself have a variable thickness profile, whereby the thickness of the second ring 608 varies as a function of circumferential position about the center 602. Similarly, the variable blend zone 606 may have a variable thickness profile as a function of circumferential position about the center 602, resulting in a transition in thickness from the maximum thickness of the ring 604 to the variable, thinner thickness of the second ring 608. For example, the variable blend zone 606-second ring 608 may be divided into eight sectors, labeled A-H in FIG. 55, including a top zone A, a top-toe zone B, a toe zone C, a bottom-toe zone D, a bottom zone E, a bottom-heel zone F, a heel zone G, and a top-heel zone H. These eight zones may have different angular widths as shown, or each may have the same angular width (e.g., 1 / 8 of 360 degrees). Each of the eight zones can have its own thickness variation, each ranging from a common maximum thickness adjacent ring 604 to a different minimum thickness at the second ring 608. For example, the second ring can be thicker in zones A and E, thinner in zones C and G, and have intermediate thicknesses in zones B, D, F, and H. In this example, zones B, D, F, and H can vary in thickness radially (thinning semi-radially outward) and circumferentially (thinning from zones A and E to zones C and G).

[0220] One example of a face portion 600 can have the following thicknesses: 3.1 mm at the center 602, 3.3 mm at the ring 604, and the second ring 608 can vary from 2.8 mm in zone A to 2.2 mm in zone C, 2.4 mm in zone E, 2.0 mm in zone G, and 1.8 mm in the heel and toe zones 610.

[0221] 56 and 57 show the rear face surface of another example face portion 700 including an asymmetric variable thickness profile. The center 702 of the face can have a center thickness, and the face thickness can gradually increase from the center to a ring of maximum thickness 704 that can be circular radially outward across an inner blend zone 703. The face thickness can gradually decrease as one moves radially outward from the ring of maximum thickness 704 across a variable blend zone 705 to an outer zone 706 consisting of a number of wedge-shaped sectors A-H having various thicknesses. As best shown in FIG. 57, sectors A, C, E, and G can be relatively thick, while sectors B, D, F, and H can be relatively thin. An outer blend zone 708 surrounding the outer zone 706 varies in thickness from the variable sectors to a circumferential ring 710 having a relatively small but constant thickness. The outer zone 706 can also include blend zones between each of the sectors A-H that transition in thickness gradually from one sector to the adjacent sector.

[0222] One example of face portion 700 can have the following thicknesses: 3.9 mm at center 702, 4.05 mm at ring 704, 3.6 mm at zone A, 3.2 mm at zone B, 3.25 mm at zone C, 2.05 mm at zone D, 3.35 mm at zone E, 2.05 mm at zone F, 3.00 mm at zone G, 2.65 mm at zone H, and 1.9 mm at peripheral ring 710.

[0223] FIG. 58 illustrates the rear of another exemplary face portion 800 including an asymmetric variable thickness profile with a target thickness offset toward the heel side (left side). The center 802 of the face has a center thickness and toward the toe / top / bottom the thickness gradually increases across an inner blend zone 803 to an inner ring 804 having a thickness greater than the center 802. The thickness then decreases moving radially outward across a second blend zone 805 to a second ring 806 having a thickness less than the thickness of the inner ring 804. The thickness then decreases moving radially outward across a third blend zone 806 to a third ring 808 having a thickness less than the thickness of the second ring 806. The thickness then decreases moving radially outward across a fourth blend zone 810 to a fourth ring 811 having a thickness less than the thickness of the third ring 808. The tow end zone 812 blends with a periphery 814 having a relatively thin thickness across the outer blend zone 813 .

[0224] On the heel side, the thicknesses are offset by a set amount (e.g., 0.15 mm) to be slightly thicker relative to their corresponding regions on the toe side. Thickened zone 820 (dashed line) provides a transition where all thicknesses gradually increase toward the thicker offset zone 822 (dashed line) on the heel side. In offset zone 822, ring 823 is thicker than ring 806 on the heel side by a set amount (e.g., 0.15 mm), and ring 825 is thicker than ring 808 by the same set amount. Blend zones 824 and 826 gradually decrease in thickness as they move radially outward and are thicker than corresponding blend zones 807 and 810, respectively, on the toe side. In thickened zone 820, inner ring 804 gradually increases in thickness as it moves toward the heel.

[0225] One example of face portion 800 can have the following thicknesses: 3.8 mm at center 802, 4.0 mm at inner ring 804, thickening to 4.15 mm across thickened zone 820, 3.5 mm at second ring 806 and 3.65 mm at ring 823, 2.4 mm at third ring 808 and 2.55 mm at ring 825, 2.0 mm at fourth ring 811, and 1.8 mm at peripheral ring 814.

[0226] The desired offset thickness profile shown in FIG. 58 can help provide a desirable CT profile across the face. A thicker heel side can help avoid having a CT spike on the heel side of the face, for example, which can help avoid having a non-conforming CT profile across the face. Such an offset thickness profile can be applied to the toe side of the face or both the toe and heel sides of the face as well to avoid CT spikes on both the heel and toe sides of the face. In other embodiments, the offset thickness profile can be applied to the upper side of the face and / or the lower side of the face.

[0227] The golf club head 100 also includes a hosel 120 extending from the heel region 116 of the golf club head 100. As shown in FIG. 28, a shaft 272 of the golf club 270 may be directly attached to the hosel 120 or may be indirectly attached to the hosel 120, such as via a Flight Control Technology (FCT) member 122 (e.g., an adjustable lie / loft assembly) coupled to the hosel 120 (see, e.g., FIG. 3). The golf club 270 also includes a grip 274 attached around a distal or free end of the shaft 272. The grip 104 of the golf club 270 helps to facilitate the handling of the golf club 270 by a user during a golf swing. The golf club head 100 includes a hosel axis 191 (see, e.g., FIG. 3) that is coaxial with the shaft 272 and defines a central axis of the hosel 120.

[0228] In some embodiments, as shown in FIG. 3 , the body 110 of the golf club head 100 includes a frame 124 to which one or more inserts of the body 110 are coupled. For example, the crown portion 119 of the body 110 includes a crown insert 126 attached to the frame 124 at a top region 133 of the golf club head 100. Similarly, the sole portion 117 of the body 110 includes a sole insert attached to the frame 124 at a bottom region 135 of the golf club head 100. For example, the frame 124 of the body 110 can have at least one of a sole opening sized and configured to receive the sole insert or a crown opening 162 sized and configured to receive the crown insert 126. More specifically, the sole opening receives and secures the sole insert. Similarly, the crown opening 162 receives and secures the crown insert 126. The sole and crown openings are each formed with a periphery or recess for seating the sole insert and crown insert, respectively, which are either flush with or slightly recessed from the frame 124 to provide a smooth, seamless outer surface.

[0229] Although not shown, the frame 124 may have a face opening in the forward region 112 of the body 110 for receiving and securely fastening the striking plate 143 of the golf club head 100. In some implementations, the striking plate 143 is securely fastened to the face opening of the frame 124 by welding, brazing, soldering, screws, or other fastening means. In general, the frame 124 provides a framework or skeleton for the golf club head 100 to strengthen the golf club head 100 in areas that experience high stresses caused by the impact of a golf ball with the face portion 142. Such areas include transition areas where the golf club head 100 transitions from the face portion 142 of the body 110 to the crown portion 119, the sole portion 117, and the skirt portion 121.

[0230] In some examples, the body 110 (e.g., only the frame 124 of the body 110) and / or the face portion 142 are made of one or more of the following materials: carbon steel, stainless steel (e.g., 17-4PH stainless steel), alloy steel, Fe-Mn-Al alloy, nickel-based ferroalloy, cast iron, superalloy steel, aluminum alloy (including but not limited to 3000 series alloys, 5000 series alloys, 6000 series alloys such as 6061-T6, 7000 series alloys such as 7075), magnesium alloy, copper alloy, titanium alloy (6-4 titanium, 3-2.5, 6-4, SP700, 15-3-3-3, 10-2-3, or other alpha / near alpha, alpha-beta, and beta / near beta titanium alloys), or mixtures thereof. In yet other examples, the body 110 (e.g., the crown insert and / or the sole insert) and / or the face portion 142 are made of one or more of the following materials: carbon steel, stainless steel (e.g., 17-4PH stainless steel), alloy steel, Fe-Mn-Al alloy, nickel-based ferroalloy, cast iron, superalloy steel, aluminum alloy (including but not limited to 3000 series alloys, 5000 series alloys, 6000 series alloys such as 6061-T6, 7000 series alloys such as 7075), magnesium alloy, copper alloy, titanium alloy (6-4 titanium, 3-2.5, 6-4, SP700, 15-3-3-3, 10-2-3, or other alpha / near alpha, alpha-beta, and beta / near beta titanium alloys), or mixtures thereof. In yet other examples, the body 110 (e.g., the crown insert and / or the 3 to about 2 g / cm 3 Between about 2g / cm 3 The non-metallic material may include a polymer or a polymer-reinforced composite. The polymer may be either thermoset or thermoplastic and may be amorphous, crystalline and / or semi-crystalline in structure.

[0231] The body 110 is made of a titanium alloy, which in some examples can be either titanium or various titanium-based alloys. In specific examples, the body 110 is made of a titanium alloy, including but not limited to 9-1-1 titanium, 6-4 titanium, 3-2.5, 6-4, SP700, 15-3-3-3, 10-2-3, or other alpha / near alpha, alpha-beta, and beta / near beta titanium alloys) or mixtures thereof. Titanium alloys containing aluminum (e.g., 8.5-9.5% Al), vanadium (e.g., 0.9-1.3% V), and molybdenum (e.g., 0.8-1.1% Mo), optionally with other minor alloying elements and impurities, collectively referred to herein as "9-1-1Ti", can have a less significant alpha case, which makes HF acid etching unnecessary or at least less necessary, compared to faces made from conventional 6-4Ti and other titanium alloys. Additionally, 9-1-1Ti may have minimum mechanical properties of 820 MPa yield strength, 958 MPa tensile strength, and 10.2% elongation. These minimum properties are significantly superior to typical cast titanium alloys such as 6-4Ti, which may have minimum mechanical properties of 812 MPa yield strength, 936 MPa tensile strength, and ∼6% elongation.

[0232] A golf club head body that is cast with the face as an integral part of the body (e.g., cast simultaneously as a single casting) can provide superior structural properties compared to a club head in which the face is formed separately and later attached to the front opening of the club head body. However, the advantage of having an integrally cast Ti face is mitigated by the need to remove the alpha case on the surface of the cast Ti face.

[0233] When the club head body disclosed herein includes an integrally cast 9-1-1 Ti face, the disadvantage of having to remove the alpha case can be eliminated or at least substantially mitigated. For a cast 9-1-1 Ti face, using conventional mold preheat temperatures of 1000C or greater, the thickness of the alpha case can be about 0.15mm or less, or about 0.20mm or less, or about 0.30mm or less in some embodiments, such as about 0.10mm to about 0.30mm, while for a cast 6-4 Ti face, the thickness of the alpha case can be greater than about 0.15mm, or greater than about 0.20mm, or greater than about 0.30mm, in some instances, such as about 0.25mm to about 0.30mm.

[0234] In some cases, the reduced thickness of the alpha case of the 9-1-1Ti face section (e.g., 0.15 mm or less) may not be thin enough to provide sufficient durability required for the face section and avoid the need to etch away part of the alpha case with harsh chemical etchants such as HF acid. In such cases, the preheat temperature of the mold can be reduced (e.g., below 800C, below 700C, below 600C, and / or below 500C) before pouring the molten titanium alloy into the mold. This can further reduce the amount of oxygen that transfers from the mold to the cast titanium alloy, resulting in a thinner alpha case (e.g., below 0.15 mm, below 0.10 mm, and / or below 0.07 mm). This provides better ductility and durability for a body with an integral face, which is especially important for the face section.

[0235] The thinner alpha case of the cast 9-1-1Ti face helps provide improved durability such that the face is durable enough that removal of some of the alpha case from the face by chemical etching is not required. Thus, when the body and face are cast integrally using 9-1-1Ti, especially when using a mold with a lower preheat temperature, hydrofluoric acid etching can be eliminated from the manufacturing process. This can simplify the manufacturing process, reduce costs, reduce safety risks and operational hazards, and eliminate the possibility of environmental contamination by HF acid. Furthermore, because HF acid is not introduced into the metal, the body with the integral face, or even the entire club head, can contain little or substantially no fluorine atoms, which can be defined as less than 1000 ppm, less than 500 ppm, less than 200 ppm, and / or less than 100 ppm, with any fluorine atoms present being due to impurities in the metal material used to cast the body.

[0236] In some examples, the body 110 is made of an alpha-beta titanium alloy including 6.5% to 10% Al, 0.5% to 3.25% Mo, 1.0% to 3.0% Cr, 0.25% to 1.75% V, and / or 0.25% to 1% Fe by weight, with the balance including Ti (one example is sometimes referred to as a "1300" titanium alloy). In another representative example, the alloy may include 6.75% to 9.75% Al, 0.75% to 3.25% or 2.75% Mo, 1.0% to 3.0% Cr, 0.25% to 1.75% V, and / or 0.25% to 1% Fe by weight, with the balance including Ti. In yet another exemplary embodiment, the alloy can include 7% to 9% Al, 1.75% to 3.25% Mo, 1.25% to 2.75% Cr, 0.5% to 1.5% V, and / or 0.25% to 0.75% Fe, with the balance including Ti. In a further exemplary embodiment, the alloy can include 7.5% to 8.5% Al, 2.0% to 3.0% Mo, 1.5% to 2.5% Cr, 0.75% to 1.25% V, and / or 0.375% to 0.625% Fe, with the balance including Ti. In another exemplary embodiment, the alloy may include 8 wt.% Al, 2.5 wt.% Mo, 2 wt.% Cr, 1 wt.% V, and / or 0.5 wt.% Fe, with the balance including Ti (such a titanium alloy may have the formula Ti-8Al-2.5Mo-2Cr-1V-0.5Fe). As used herein, references to "Ti-8Al-2.5Mo-2Cr-1V-0.5Fe" refer to a titanium alloy including the referenced elements in any of the above proportions. Certain embodiments may also include trace amounts of K, Mn, and / or Zr, and / or various impurities.

[0237] Ti-8Al-2.5Mo-2Cr-1V-0.5Fe may have minimum mechanical properties of 1150 MPa yield strength, 1180 MPa ultimate tensile strength, and 8% elongation. These minimum properties may be significantly superior to other cast titanium alloys, including 6-4Ti and 9-1-1Ti, which may have the above minimum mechanical properties. In some embodiments, Ti-8Al-2.5Mo-2Cr-1V-0.5Fe has a tensile strength of about 1180 MPa to about 1460 MPa, a yield strength of about 1150 MPa to about 1415 MPa, an elongation of about 8% to about 12%, an elastic modulus of about 110 GPa, and an elongation of about 4.45 g / cm. 3 and a hardness of about 43 on the Rockwell C scale (43HRC). In certain embodiments, the Ti-8Al-2.5Mo-2Cr-1V-0.5Fe alloy may have a tensile strength of about 1320 MPa, a yield strength of about 1284 MPa, and an elongation of about 10%. The Ti-8Al-2.5Mo-2Cr-1V-0.5Fe alloy, particularly when used to cast golf club head bodies, facilitates less deflection for the same thickness due to its higher ultimate tensile strength compared to other materials. In some implementations, providing less deflection for the same thickness is beneficial for golfers with higher swing speeds because the face of the golf club head maintains its original shape (e.g., bulge and roll) over time and is less prone to flattening over time.

[0238] The polymer may also be made of engineering plastics, such as crystalline or semi-crystalline engineering plastics or amorphous engineering plastics. Potential engineering plastic candidates include polyphenylene sulfide ether (PPS), polyetherimide (PEI), polycarbonate (PC), polypropylene (PP), acrylonitrile-butadiene styrene plastic (ABS), polyoxymethylene plastic (POM), nylon 6, nylon 6-6, nylon 12, polymethyl methacrylate (PMMA), polyphenylene oxide (PPO), polybutylene terephthalate (PBT), polysulfone (PSU), polyethersulfone (PES), polyetheretherketone (PEEK), or mixtures thereof. Organic fibers, such as glass fibers, carbon fibers, or metal fibers, can be added to the engineering plastic to increase structural strength. The reinforcing fibers can be continuous long fibers or short fibers. One advantage of PSU is that it is relatively stiff with relatively low damping, which produces a better sounding or more metallic sounding golf club compared to other polymers that may be overly damped. Additionally, PSU requires less post-processing in that it does not require finishing or painting to achieve the final finished golf club head.

[0239] One exemplary material from which the sole insert and / or crown insert 126 can be formed is a thermoplastic continuous carbon fiber composite laminate material having long carbon fibers in a PPS (polyphenylene sulfide) matrix or base. A commercially available example of a fiber reinforced polymer from which the sole insert and / or crown insert 126 can be made is TEPEX® DYNALITE 207 manufactured by Lanxess®. TEPEX® DYNALITE 207 is a high strength lightweight material arranged in sheets having multiple layers of continuous carbon fiber reinforcement in a PPS thermoplastic matrix or polymer to embed the fibers. The material can have a fiber volume of 54%, but can also have other fiber volumes (e.g., 42% to 57% volume). According to one example, the material has a fiber weight of 200 g / m 2Another commercially available example of a fiber reinforced polymer for manufacturing the sole and / or crown insert 126 is TEPEX® DYNALITE 208. This material also has a carbon fiber volume ranging from 42-57%, including 45% by volume in one example, and a weight of 200 g / m 2 DYNALITE 208 differs from DYNALITE 207 in that it has a TPU (thermoplastic polyurethane) matrix or base rather than a polyphenylene sulfide (PPS) matrix.

[0240] As an example, the fibers of each sheet of TEPEX® DYNALITE 207 sheet (or other fiber reinforced polymer material such as DYNALITE 208) are oriented in the same direction with the sheets oriented in opposite directions from each other, and the sheets are placed into a two-piece (male / female) matching mold, heated above melting temperature, and formed to form when the die is closed. This process is sometimes referred to as thermoforming, and is particularly suited to forming the sole insert and crown insert 126. After the crown insert 126 and / or sole insert are formed by the thermoforming process (separately in some implementations), each is cooled and removed from the matching mold. In some implementations, the crown insert 126 and / or sole insert have a uniform thickness, which facilitates the use of the thermoforming process and ease of manufacture. However, in other implementations, the crown insert 126 and / or sole insert may have a variable thickness to strengthen selected localized areas of the insert, for example, by adding additional plies to selected areas to improve durability, acoustic properties, or other properties of the respective insert.

[0241] In some examples, the crown insert 126 and / or sole insert can be manufactured by methods other than thermoforming, such as injection molding or thermosetting. In a thermosetting process, the crown insert 126 and / or sole insert can be manufactured from "prepreg" plies of woven fabric or unidirectional composite fiber fabric (such as carbon fiber composite fabric) that are pre-impregnated with a resin and hardener formulation that activates when heated. The prepreg plies are placed into a mold suitable for the thermosetting process, such as a bladder mold or compression mold, and stacked / oriented with the carbon or other fibers facing in different directions. The plies are heated to activate a chemical reaction that forms the crown insert 126 and / or sole insert. Each insert is cooled and removed from its respective mold.

[0242] The carbon fiber reinforcement material for the crown insert 126 and / or sole insert produced by the thermosetting manufacturing process may be carbon fiber having a tensile modulus of 234 Gpa (34 Msi) and a tensile strength of 4500 Mpa (650 Ksi), known as "34-700" fiber, available from Grafil, Inc., Sacramento, Calif. Another suitable fiber, also available from Grafil, Inc., is carbon fiber known as "TR50S" fiber, having a tensile modulus of 240 Gpa (35 Msi) and a tensile strength of 4900 Mpa (710 Ksi). Exemplary epoxy resins for the prepreg plies used to form the thermosetting crown and sole inserts include Newport 301 and 350, available from Newport Adhesives & Composites, Inc., Irvine, Calif. In one example, the prepreg sheet has an areal weight of about 20 g / m^2 to about 200 g / m^2, preferably about 70 g / m^2, and has a quasi-isotropic fiber reinforcement of 34 to 700 fibers impregnated with epoxy resin, resulting in a resin content (R / C) of about 40%. For ease of reference, the primary composition of the prepreg sheet can be identified in an abbreviation by identifying its fiber areal weight, fiber type, e.g., 70 FAW 34-700. The abbreviation can further identify the resin system and resin content, e.g., 70 FAW 34-700 / 301, R / C 40%. According to some examples, the areal weight of the crown portion of the golf club head is about 0.35 g / cm^2 over about 50% or more of the total surface area of ​​the crown portion. 2 In the same or another example, the weight per area of ​​the sole of the golf club head is less than about 0.35 g / cm over about 50% or more of the total surface area of ​​the sole. 2 is less than.

[0243] The crown insert 126, and in some implementations the sole insert, has a complex three-dimensional shape and curvature that generally corresponds to the desired shape and curvature of the crown portion 119 of the golf club head 100. It will be appreciated that other types of club heads, such as fairway wood type clubs, may be manufactured using one or more of the principles, methods, and materials described herein.

[0244] 10, 11, and 16-18, in some implementations, the golf club head 100 includes a slot 170 formed in the sole portion 117 of the body 110. The slot 170 opens to the exterior of the golf club head 100 and extends longitudinally from the heel region 116 to the toe region 114. More specifically, the slot 170 is elongated in a longitudinal direction that is substantially parallel to but offset from the face portion 142. Generally, the slot 170 is a groove or channel formed in the sole portion 117 of the body 110 of the golf club head 100. In some implementations, the slot 170 is a through slot, or a slot that is open on the sole side of the slot 170 and open on the interior cavity 113 or interior side of the slot 170. However, in other implementations, as shown in FIGS. 10, 11, and 16-18, the slot 170 is not a through slot, but rather is closed on the interior cavity or interior side of the slot 170. For example, slot 170 is defined by a portion 171 of a sidewall of sole portion 117 of body 110 that protrudes into internal cavity 113 and has a concave outer surface having any of a variety of cross-sectional shapes, such as substantially U-shaped, V-shaped, etc.

[0245] The slot 170 may be any of the various flexible boundary structures (FBS) described in U.S. Patent No. 9,044,653, filed March 14, 2013, which is incorporated herein by reference in its entirety. Additionally or alternatively, the golf club head 100 may include one or more other FBSs at any of a variety of other locations on the golf club head 100. The slot 170 may be comprised of several portions, which may be curved portions or a combination of curved and straight portions. Additionally, the slot 170 may be machined or cast into the golf club head 100. Although shown in the sole portion 117 of the golf club head 100, the slot 170 may alternatively or additionally be incorporated into the crown portion 119 of the golf club head 100.

[0246] In some implementations, the slot 170 is filled with a filler. The filler can be made of a non-metallic material, such as a thermoplastic material, a thermoset material, etc. The slot 170 may be filled with a material to prevent dirt and other debris from entering the slot and possibly the internal cavity 113 of the golf club head 100 when the slot 170 is a through slot. The filler can be any relatively low modulus material, including polyurethane, elastomeric rubber, polymers, various rubbers, foams, and fillers. The filler should not substantially impede deformation of the golf club head 100 during use, as this would impede flexibility of the perimeter.

[0247] In one embodiment, the filler is a viscous material that is initially injected or otherwise inserted into the slot 170. Examples of materials that may be suitable for use as a filler disposed within the slots, channels, and other flexible boundary structures include, but are not limited to, viscoelastic elastomers; vinyl copolymers with or without inorganic fillers; polyvinyl acetate with or without inorganic fillers such as barium sulfate; acrylics; polyesters; polyurethanes; polyethers; polyamides; polybutadiene; polystyrene; polyisoprene; polyethylene; polyolefins; styrene / isoprene block copolymers; hydrogenated styrenic thermoplastic elastomers; metallized polyesters; metallized acrylics; epoxies; epoxy and graphite composites; natural and synthetic rubbers; piezoelectric ceramics; thermoset and thermoplastic rubbers; foamed polymers; ionomers; low density fiberglass; bitumen; silicones; and mixtures thereof. Metallized polyesters and acrylics can include aluminum as the metal. Commercially available materials include resilient polymeric materials such as Scotchweld® (e.g., DP-105®) and Scotchdamp® from 3M, Sorbothane® from Sorbothane, Inc., DYAD® and GP® from Soundcoat Company Inc., Dynamat® from Dynamat Control of North America, Inc., NoViFlex®, Sylomer® from Pole Star Maritime Group, LLC, Isoplast® from The Dow Chemical Company, Legetolex® from Piqua Technologies, Inc., and Hybrar® from Kuraray Co., Ltd. In some embodiments, the solid filler may be pressed or adhesively bonded into the slots, channels, or other flexible boundary structures. In other embodiments, the filler material may be poured, injected, or otherwise inserted into the slots or channels and cured in place to form a fully cured or resilient exterior surface.In yet other embodiments, the filler is placed into the slot or channel and sealed in place with a resilient cap or other structure formed of metal, metal alloy, metal, composite, hard plastic, resilient elastomer, or other suitable material.

[0248] In other implementations, the slots 170 are not filled with filler, but rather maintain an open, empty space within the slots 170 .

[0249] 11, the slot 170 functions as a weight track for adjustably retaining at least one weight 175 therein. Thus, the slot 170 is defined in some implementations as a front or rear weight track. As mentioned above, the slot 170 can be integrally formed with the body 110. The slot 170 can define a track or port in which the at least one weight 175 is slidably mounted. In one example, the at least one weight 175 includes a first weight (or weight assembly) having two pieces and a second weight (or weight assembly) having two pieces. Each of the first and second weights is secured to the slot 170 by a respective fastening means such as a screw. In some implementations, the first and second weights can be secured to the slot 170 by tightening a portion of the track, such as at least one ledge, such that the fastening means is placed in tension. Alternatively or additionally, the first and second weights may be secured to the slot 170 by compressing them against a portion of the track such that the securing means is placed in compression. The first and second weights may take any of a variety of shapes and may be attached to the slot 170 in any of a variety of ways. Furthermore, the at least one weight 175 may take the form of a single piece design or a multi-piece design (e.g., three or more pieces).

[0250] The slot 170 allows the slot 175 to be selectively loosened and tightened for slidable adjustment laterally in the heel-toe direction to adjust the effective center of gravity (CG) of the golf club head 100 in the heel-toe direction. Adjusting the CG of the golf club head 100 laterally adjusts the performance characteristics of the golf club head 100, which facilitates adjustment to the flight characteristics of a golf ball struck by the golf club head 100, such as the side spin characteristics of the golf ball. In particular, the use of two weights (e.g., first and second weights) that are independently adjustable relative to each other allows for adjustment and interaction between the weights. For example, both weights may be positioned completely in the toe region 114, completely in the heel region 116, at a maximum distance from each other, with one weight completely in the toe region 114 and the other weight completely in the heel region 116, together in the center or intermediate position of the slot 170, or in other weight position patterns.

[0251] In some embodiments, the slot 170 is offset from the face portion 142 by an offset distance, which is the minimum distance between a first vertical plane passing through the center of the striking plate of the face portion 142 and the slot at the same x-axis coordinate as the center of the striking plate, such as about 5 mm to about 50 mm, for example about 5 mm to about 35 mm, for example about 5 mm to about 30 mm, for example about 5 mm to about 20 mm, or about 5 mm to about 15 mm.

[0252] Although not shown, the body 110 of the golf club head 100 may include a rear slot having a configuration similar to the slot 170, but oriented in the front-to-rear direction opposite the heel-to-toe direction. The body 110 includes the rear slot, but in some implementations does not include the slot 170, and in other implementations includes both the rear slot and the slot 170. In one example, the rear slot is located rearward of the slot 170. The rear slot can function as a weight track in some implementations. Additionally, the rear track can be offset from the face portion 142 by an offset distance, which is the minimum distance between a first vertical plane passing through the center of the striking plate of the face portion 142 and the rear track at the same x-axis coordinate as the center of the striking plate 43, such as about 5 mm to about 50 mm, such as about 5 mm to about 40 mm, such as about 5 mm to about 30 mm, or about 10 mm to about 30 mm.

[0253] In certain embodiments, the slot 170, as well as the rear slot, if present, has a particular slot width, which is measured as the horizontal distance between the first and second slot walls. As with the rear track, for the slot 170, the slot width can be from about 5 mm to about 20 mm, such as from about 10 mm to about 18 mm, or from about 12 mm to about 16 mm, etc. According to some embodiments, the depth of the slot 170 (i.e., the vertical distance between the bottom slot wall and an imaginary plane that includes the area of ​​the sole adjacent the first and second slot walls of the slot 170) can be from about 6 mm to about 20 mm, such as from about 8 mm to about 18 mm, or from about 10 mm to about 16 mm, etc.

[0254] Additionally, the slots 170, as well as the rear slots, if present, have a particular slot length, which may be measured as the horizontal distance between a slot end wall and another slot end wall. For both the slots 170 and the rear slots, their lengths may be from about 30 mm to about 120 mm, such as from about 50 mm to about 100 mm, or from about 60 mm to about 90 mm, etc. Alternatively or additionally, the length of the slots 170 may be expressed as a percentage of the length of the striking plate of the face portion 142. For example, the slots 170 may be from about 30% to about 100% of the length of the striking plate, such as from about 50% to about 90% or from about 60% to about 80% mm of the length of the striking plate.

[0255] In some examples, the slot 170 is a feature for improving and / or increasing the coefficient of restitution (COR) across the striking plate 143 of the face portion 142. With respect to the COR feature, the slot 170 can take various forms, such as a channel or a through slot. The COR of the golf club head 100 is a measurement of the energy loss or retention between the golf club head 100 and a golf ball when the golf ball is struck by the golf club head 100. It is desirable for the COR of the golf club head 100 to be high to promote efficient transfer of energy from the golf club head 100 to the ball during impact with the ball. Thus, the COR feature of the golf club head 100 promotes an increase in the COR of the golf club head 100. In general, the slot 170 increases the COR of the golf club head 100 by increasing or enhancing flexibility around the striking plate of the face portion 142 of the golf club head 100.

[0256] Further details regarding the slot 170 as a COR feature of the golf club head 100 can be found in U.S. patent application Ser. Nos. 13 / 338,197, 13 / 469,031, and 13 / 828,675, filed Dec. 27, 2011, May 10, 2012, and Mar. 14, 2013, respectively, U.S. patent application Ser. No. 13 / 839,727, filed Mar. 15, 2013, U.S. Patent No. 8,235,844, filed Jun. 1, 2010, U.S. Patent No. 8,241,143, filed Dec. 13, 2011, and U.S. Patent No. 8,241,144, filed Dec. 14, 2011, all of which are incorporated herein by reference in their entireties.

[0257] The golf club head 100 disclosed herein may have a volume equal to the swept volume of the body 110 of the golf club head 100. For example, the golf club head 100 of the present application may have a volume equal to the swept volume of the body 110 of the golf club head 100. 3 ~about 600cm 3 In a more particular embodiment, the head volume is about 250 cm 3 ~about 500cm 3 In an even more particular embodiment, the head volume is about 300 cm 3 ~about 500cm 3 , about 300cm 3 ~approx. 360cm 3 , about 300cm 3 ~about 420cm 3 , about 350cm 3 ~about 500cm 3 , or about 420 cm 3 ~about 500cm 3 For a driver, the golf club head 100 may be approximately 300 cm 3 ~about 460cm 3 For a fairway wood, the golf club head 100 may have a volume of about 100 cm 3 ~250cm 3For a utility or hybrid club, the golf club head 100 may have a volume of about 60 cm 3 ~150cm 3 and a total weight of about 145 g to about 280 g.

[0258] The golf club head 100 includes at least one stiffener 150 disposed at least partially within the interior cavity 113, as shown generally in FIGS. 4-6. The stiffener 150 can be directly coupled (e.g., contactable or abuttingly engaged) to the face portion 142 of the body 110. More specifically, the stiffener 150 can be directly coupled to the inner surface 145 of the face portion 142 of the body 110. The inner surface 145 is opposite the striking face 144, which defines the outer surface of the face portion 142. In some implementations, the stiffener 150 can be directly coupled to the inner surface 145 of just the lip 147 of the face portion 142. However, in other implementations, the stiffener 150 can be directly coupled to the inner surface 145 of both the lip 147 and the striking plate 143. In embodiments in which the striking plate 143 is welded to the lip 147, the stiffener 150 can be directly coupled to the weld. The stiffener 150 may be non-adjustably coupled directly to the inner surface 145 of the face portion 142, or may be adjustably coupled directly to the inner surface 145 of the face portion 142. As defined herein, the stiffener 150 is non-adjustably coupled directly to the inner surface 145 when permanent deformation is required to separate the stiffener 150 from the face portion 142. On the other hand, as defined herein, the stiffener 150 is adjustably coupled directly to the inner surface 145 when the stiffener 150 can be separated from the face portion 142 without permanent deformation.

[0259] The stiffener 150 is configured to locally stiffen the face portion 142 such that, when directly coupled to the face portion 142, the characteristic time (CT) of the golf club head 100 in an area of ​​the striking plate 143 proximate the stiffener 150 is lower than it would be without the stiffener 150. In general, the stiffener 150 stiffens the face portion 142 in an area of ​​the striking plate 143 that is offset from the origin 183 of the club head origin coordinate system 185 along the x-axis of the club head origin coordinate system 185 and away from the origin 183 along the x-axis of the club head origin coordinate system 185, lowering the CT. In this manner, the CT of the golf club head 100 can be locally reduced at locations having x-axis coordinates in a toe direction (e.g., toward the toe region 114) and / or in a heel direction (e.g., toward the heel region 116) away from the origin 183 without significantly affecting the CT of the golf club head 100 at locations having x-axis coordinates proximate to the x-axis coordinate of the origin 183. Additionally, the use of the stiffeners 150 to discretely reduce the CT of the golf club head 100 at locations having x-axis coordinates in a toe direction and / or heel direction away from the origin 183 helps achieve a desirable COR of the striking plate 143 by promoting a thinner thickness of the striking plate 143, particularly at the toe and / or heel locations of the striking plate 143.

[0260] The golf club head 100 may have any number of stiffeners 150 at any of a variety of locations with x-axis coordinates greater than or less than zero. The stiffeners 150 with x-axis coordinates greater than zero are located closer to the toe region 114 than the heel region 116 and therefore may be considered toe stiffeners. Meanwhile, the stiffeners 150 with x-axis coordinates less than zero are located closer to the heel region 116 than the toe region 114 and therefore may be considered heel stiffeners. Referring to FIG. 6, there are two stiffeners 150 with x-axis coordinates greater than zero and two stiffeners 150 with x-axis coordinates less than zero. In another embodiment as shown in FIG. 9, the golf club head 100 has two or more stiffeners 150 with x-axis coordinates greater than zero and two or more stiffeners 150 with x-axis coordinates less than zero. However, in yet other embodiments, the golf club head 100 has fewer than two stiffeners 150 with an x-axis coordinate greater than zero (e.g., zero stiffeners or one stiffener) and / or fewer than two stiffeners 150 with an x-axis coordinate less than zero (e.g., zero stiffeners or one stiffener).

[0261] Additionally, each stiffener 150 of the golf club head 100 may be connectable (e.g., directly connectable) to an inner surface of the body 110 at the top region 133 and / or bottom region 135 of the golf club head 100. With reference to Figures 4 and 5, in one embodiment, the golf club head 100 includes at least one stiffener 150 connectable directly to an inner surface of the body 110 at the top region 133 and at least one stiffener 150 connectable directly to an inner surface of the body 110 at the bottom region 135 of the golf club head 100. It is recognized that in some implementations, one stiffener 150 may be connectable directly to an inner surface of the body 110 at both the top region 133 and the bottom region 135 (e.g., extends continuously from the top region 133 to the bottom region 135).

[0262] 6, in one embodiment, the golf club head 100 includes two stiffeners 150 directly bondable to the inner surface of the body 110 at the top region 133 and two stiffeners 150 directly bondable to the inner surface of the body 110 at the bottom region 135 of the golf club head 100. According to other embodiments, the golf club head 100 includes one or more stiffeners 150 directly bondable to the inner surface of the body 110 at the top region 133 but does not include a stiffener 150 directly bondable to the inner surface of the body 110 at the bottom region 135, or includes one or more stiffeners 150 directly bondable to the inner surface of the body 110 at the bottom region 135 but does not include a stiffener 150 directly bondable to the inner surface of the body 110 at the top region 133.

[0263] Additionally, the amount of stiffener 150 that can be directly bonded to the inner surface of body 110 at top region 133 may be the same as or different from the amount of stiffener 150 that can be directly bonded to the inner surface of body 110 at bottom region 135. For example, in one implementation, the amount of stiffener 150 that can be directly bonded to the inner surface of body 110 at bottom region 135 is greater than the amount of stiffener 150 that can be directly bonded to the inner surface of body 110 at top region 133. However, stiffener 150 is sized such that the total area of ​​inner surface 145 of face portion 142 that stiffener 150 contacts is less than the total area of ​​inner surface 145 of face portion 142.

[0264] The stiffeners 150 are significantly offset from the origin along the x-axis of the club head origin coordinate system 185, resulting in a corresponding decrease in CT at locations offset from the origin along the x-axis. In one embodiment, one or more of the stiffeners 150 of the golf club head 100 have an x-axis coordinate of the club head origin coordinate system 185 that is greater than 10 mm and less than 50 mm, or greater than -50 mm and less than -10 mm. According to another embodiment, one or more of the stiffeners 150 of the golf club head 100 have an x-axis coordinate of the club head origin coordinate system 185 that is greater than 20 mm and less than 50 mm, or greater than -50 mm and less than -20 mm. In another embodiment, one or more of the stiffeners 150 of the golf club head 100 have an x-axis coordinate of the club head origin coordinate system 185 that is greater than 30 mm and less than 40 mm, or greater than -40 mm and less than -30 mm. In another embodiment, one or more of the stiffeners 150 of the golf club head 100 has an x-axis coordinate in the club head origin coordinate system 185 that is greater than 40 mm and less than 50 mm, or greater than -50 mm and less than -40 mm. The location of the stiffener 150 is defined as the location of either the midpoint (e.g., geometric center) or center of mass of the face or center-contactable portion of the stiffener 150.

[0265] In embodiments having multiple reinforcements 150, two or more of the reinforcements 150 can be of different types. In other words, in some embodiments, not all of the reinforcements 150 are the same type of reinforcement. More specifically, one of the reinforcements 150 can be a particular type of reinforcement described herein, and another of the reinforcements 150 can be another type of reinforcement described herein. For example, the reinforcements 150 in the top region 133 can be one type of reinforcement 150 (e.g., ribs) and the reinforcements 150 in the bottom region 135 can be another type of reinforcement 150 (e.g., discrete chunks of polymeric material).

[0266] 4 and 5, in some examples, the inner surface 145 of the face portion 142 includes a continuous bead 149 around the center of the face portion 142. In other words, the continuous bead 149 defines a portion of the inner surface 145 of the face portion 142. The continuous bead 149 can be a welded bead formed when the striking location 143 is welded to an opening in the face portion. Alternatively, the continuous bead 149 can be a cast bead that is cast simultaneously with the face portion 142 and the body 110 according to a wax-weld casting technique such as that described in more detail in U.S. Patent Application No. 16 / 161,337, filed October 16, 2018, which is incorporated by reference herein in its entirety, and in yet another example, the continuous bead 149 is formed by chemically etching the inner surface 145 with a chemical such as hydrochloric acid. In either example, the thickness of the face portion 142 at the continuous bead 149 is greater than the thickness at the portion of the face portion directly adjacent to the continuous bead 149. As shown, the reinforcement 150, in some embodiments, extends from an inner surface of the body 110 (e.g., an inner surface of the crown portion 114 or the sole portion 117) at least to the continuous bead 149 such that the reinforcement 150 contacts at least the periphery of the continuous bead 149. In some examples, the reinforcement 150 extends beyond or through the continuous bead 149 such that the reinforcement 150 contacts the entirety of the continuous bead 149 at the location of the reinforcement 150.

[0267] 7-9, in one embodiment, the stiffener 150 is a rib 152 non-adjustably coupled directly to the face portion 142. When the rib 152 is directly coupled to the face portion 142 at the bottom region 135 of the golf club head 100, the rib 152 can be considered a lower rib. On the other hand, when the rib 152 is directly coupled to the face portion 142 at the top region 133 of the golf club head 100, the rib 152 can be considered an upper rib. The rib 152 is directly coupled to an inner surface of the lip 147, and in certain implementations, is also directly coupled to an inner surface of the striking plate 143. In addition to the face portion 142, the rib 152 in the bottom region 135 can be non-adjustably coupled directly to an inner surface of the sole portion 117 and / or skirt portion 121, and the rib 152 in the top region 133 can be non-adjustably coupled directly to an inner surface of the crown portion 119 and / or skirt portion 121. The ribs 152 are integrally molded with the body 110 and form a continuous monolithic structure with the body 110. For example, in one implementation, the ribs 152 are integrally molded with the crown portion 119, the skirt portion 121, and the sole portion 117 of the body 110 in the same casting process. Thus, the ribs 152 are made of the same material as the body 110. However, in other examples, the ribs 152 are formed separately from the body 110 and welded onto the body 110.

[0268] The ribs 152 are thin-walled, sheet-like structures having a thickness significantly less than their height and length, and project substantially laterally from the face portion 142 and the sole portion 117 of the body 110. In one implementation, the ribs 152 are substantially wedge-shaped with a height that decreases only in the direction from the forward region 112 to the rearward region 118. Thus, in such an implementation, the ribs 152 do not have an inflection point. Further, with reference to FIG. 8 , in the vertical direction when the golf club head 100 is in a proper address position, the ribs 152 in the bottom region 135 have a height H R1 and the ribs 152 in the top region 133 have a height H R2 and the face portion 142 has a height H FP The height H of the face portion 142FP is equal to the vertical distance between the ground and the top of the face portion 142. In one implementation, the height H FP The height H of the rib 152 in the bottom region 135 R1 In one embodiment, the ratio of the height H of the face portion 142 is 0.15 or more, 0.17 or more, or 0.23 or more. FP The height H of the rib 152 in the bottom region 135 R1 and the height H of the rib 152 in the top region 133 R2 The ratio of the total of the height H of the face portion 142 to the total of the height H of the face portion 142 is 0.15 or more, 0.20 or more, or 0.25 or more. FP As defined herein, the height of a rib is defined as the maximum distance between the bottom of the rib and the top of the rib, and is therefore not a measure of the location of the rib on the face portion. However, the height of a rib is measured from the location L relative to the discrete mass 176, as described in more detail below. DM In addition, the rib height and face portion ratios disclosed above are equally applicable to the discrete mass 176 discrete mass height and face portion ratios.

[0269] The golf club head 100 may have any number of ribs 152. For example, in one implementation, the golf club head 100 has four ribs 152 in the bottom region 135, with two toe ribs 152 and two heel ribs 152, and four ribs 154 in the bottom region 135, with two toe ribs 154 and two heel ribs 154. The ribs 152 are spaced apart from one another in a direction parallel to the x-axis of the golf club head origin coordinate system 185.

[0270] 10 and 11 , the golf club head 100 may include a slot 170, which may be a COR feature and / or a weight track. The rib 152 may further be directly coupled to an inner surface of the slot 170 or may be disposed between the slot 170 and the face portion 142. The rib 152 provides a reinforcing bridge to structurally connect the face portion 142, and particularly the lip 147, to the slot 170.

[0271] According to one example, the CT at the center of the face portion 142 and at a position on the face portion 142 with an x-axis coordinate of 20 mm was determined for a golf club head 100 having a slot 170 but no reinforcement 150 (e.g., rib 152) at the x-axis coordinate of 20 mm, and a golf club head 100 without a slot 170 but with a reinforcement 150 at the x-axis coordinate of 20 mm was determined at the x-axis coordinate of 20 mm. The CT at the center of the face portion 142 of the golf club head 100 without the reinforcement 150 was 246 microseconds, and the CT at the center of the face portion 142 of the golf club head 100 with the reinforcement 150 was 243 microseconds. The CT of the face portion 142 at a position having an x-axis coordinate of 20 mm for the golf club head 100 without the reinforcement 150 was 256 microseconds, and the CT of the face portion 142 at a position having an x-axis coordinate of 20 mm for the golf club head 100 with the reinforcement 150 was 246 microseconds. The drop in CT at the x-axis coordinate of 20 mm had a larger drop (i.e., 12 microseconds) than the center of the face portion 142 (i.e., 3 microseconds). Thus, the reinforcement 150 helps to lower the CT of the face portion at a position away from the center of the face portion without a relatively large drop in CT at the center of the face portion. It was also determined that the difference between the COR and CT of the golf club head 100 with the reinforcement 150 was smaller than that of the golf club head 100 without the reinforcement 150, which means that the COR tracks the CT more closely in the golf club head 100 with the reinforcement 150 than in the golf club head 100 without the reinforcement 150.

[0272] 12, the golf club head 100 may further include openings 172 (e.g., holes or ports) formed in the outer wall of the body 110 proximate to each one or more of the ribs 152 or ribs 154. As shown, in one example, each opening 172 opens into a respective one of the ribs 152 or ribs 154. Thus, one of the ribs 152 is directly or indirectly accessible from the exterior of the body 110 through one of the openings 172, and one of the ribs 154 is directly or indirectly accessible from the exterior of the body 110 through another one of the openings 172. Although not shown, the golf club head 100 may further include plugs configured to respectively block one of the openings 172, thus preventing access to the ribs from the exterior of the golf club head 100. The plugs may be removable and reinsertable from the openings 172 to selectively allow and prevent access to the ribs. As will be described in more detail, the openings 172 may be used to remove a portion of a post-manufacture rib of the golf club head 100 to adjust (e.g., tune) the CT of the golf club head 100 after manufacture.

[0273] 13-15, in one embodiment, the stiffeners 150 are discrete masses 176 that are non-adjustably coupled directly to the face portion 142. The discrete masses 176 are directly coupled to the face portion 142 at the bottom region 135 of the golf club head 100. Such discrete masses 176 may be considered lower discrete masses. Meanwhile, the discrete masses 176 are directly coupled to the face portion 142 at the top region 133 of the golf club head 100. Thus, such discrete masses 176 may be considered lower upper discrete masses. The discrete masses 176 are directly coupled to the inner surface of the lip 147 and, in certain implementations, are also directly coupled to the inner surface of the striking plate 143. In addition to the face portion 142, the discrete masses 176 in the bottom region 135 may be non-adjustably joined directly to the inner surface of the sole portion 117 and / or skirt portion 121, and the discrete masses 176 in the top region 133 may be non-adjustably joined directly to the inner surface of the crown portion 119 and / or skirt portion 121.

[0274] The discrete masses 176 are made of a polymeric material. According to one example, the polymeric material of the discrete masses 176 is any of a variety of polymeric materials having a hardness of about Shore 20D or greater. In another example, the polymeric material of the discrete masses 176 is any of a variety of polymeric materials having a hardness of about Shore 45D or greater. In yet another example, the polymeric material of the discrete masses 176 is any of a variety of polymeric materials having a hardness of about Shore 85D or greater. The polymeric material is an acrylic in one implementation. In some examples, the discrete masses 176 have a hardness of Shore 40D to Shore 80D or Shore 75D to Shore 85D. In yet some examples, the discrete masses 176 have a hardness of at least Shore 50D, at least 60D, or at least 70D. In yet some examples, the discrete masses 176 are any of a variety of polymeric materials having a hardness of about Shore 5.95D or greater.

[0275] In other implementations, some examples of polymeric materials include, but are not limited to, viscoelastic elastomers, vinyl copolymers with or without inorganic fillers, polyvinyl acetate with or without inorganic fillers such as barium sulfate, acrylics, polyesters, polyurethanes, polyethers, polyamides, polybutadiene, polystyrene, polyisoprene, polyethylene, polyolefins, styrene / isoprene block copolymers, metallized polyesters, metallized acrylics, epoxies, epoxy and graphite composites, natural and synthetic rubbers, piezoelectric ceramics, thermoset and thermoplastic rubbers, foamed polymers, ionomers, low density fiberglass, bitumen, silicones, and mixtures thereof. Metallized polyesters and acrylics can include aluminum as the metal. Commercially available materials include elastomeric polymeric materials such as Scotchdamp® from 3M, Sorbothane® from Sorbothane, Inc., DYAD® and GP® from Soundcoat Company Inc., Dynamat® from Dynamat Control of North America, Inc., NoViFlex® Sylomer® from Pole Star Maritime Group, LLC, Isoplast® from The Dow Chemical Company, and Legetolex® from Piqua Technologies. In one embodiment, the polymeric material can be a material having a modulus of elasticity ranging from about 0.001 GPa to about 25 GPa and a durometer ranging from about 10 to about 30 on the Shore D scale. In a preferred embodiment, the polymeric material can be a material having a modulus of elasticity ranging from about 0.001 GPa to about 10 GPa and a durometer ranging from about 15 to about 25 on the Shore D scale. In another embodiment, the polymeric material may be a material having a modulus of elasticity ranging from about 0.001 GPa to about 5 GPa, and a durometer ranging from about 18 to about 22 on the Shore D scale. In some instances, materials that provide vibration dampening properties are preferred.

[0276] The polymeric material, in some implementations, is a thermosetting material, such as an epoxy, resin, etc. A thermosetting material is any of a variety of polymeric materials that undergo a chemical transformation that hardens and toughens the material when heated above the material's cure temperature. The chemical transformation of a thermosetting material is irreversible. The polymeric material, in other implementations, is a thermoplastic material, such as polyester, polyethylene, etc. In contrast to a thermosetting material, a thermoplastic material is any of a variety of polymeric materials that undergo a physical transformation that softens the material when heated and hardens the material when cooled. The physical transformation of a thermoplastic material is reversible.

[0277] The golf club head 100 may have any number of discrete masses 176 in the bottom region 135 and / or any number of discrete masses 176 in the top region 133. For example, in one implementation, the golf club head 100 has four discrete masses 176 in the bottom region 135, with two toe-directed discrete masses 176 and two heel-directed discrete masses 176, and four discrete masses 176 in the top region 133, with two toe-directed discrete masses 176 and two heel-directed discrete masses 176. The discrete masses 176 are considered discrete because they are spaced apart from one another in a direction parallel to the x-axis of the golf club head origin coordinate system 185. The discrete masses 176 may have any of a variety of shapes and sizes. Although shown as substantially spherical in FIGS. 13-15, the discrete masses 176 may be more flat or more polygonal.

[0278] Referring to FIG. 14, the discrete masses 176 of polymeric material are positioned at locations L 110 spaced from the outer periphery 181 of the face portion 142. DM The discrete mass 176 is directly connected to the face portion at position L DM Rather, the discrete masses 176 are spaced apart from the outer periphery 181 of the face portion 142 at locations L DM In some implementations, the position L may be directly coupled to the face portion 142 at all or only a portion thereof. DMis at least 5 mm, 10 mm, 15 mm, 20 mm, or 30 mm, depending on the lateral location of the discrete mass on the face portion and the desired reduction in CT of the face portion 142. For example, the location L DM , the greater the impact of the face portion 142 on the CT. The outer periphery 181 is defined as the outermost boundary of the face portion 142 radially away from the geometric center of the face portion 142, or as an imaginary line where the face portion 142 transitions into the crown portion 119, the sole portion 117, and the skirt portion 121. Thus, the outer periphery 181 is not the same as the outer periphery of the striking plate 143. Rather, as shown in FIG. 6, for example, the outer periphery 181 of the face portion 142 is radially away from and surrounds the edge of the striking plate 143.

[0279] The discrete masses 176 of polymeric material are bonded directly to the face portion 142 such that the discrete masses 176 contact a certain amount of surface area of ​​the face portion (e.g., the inner surface 145 of the face portion 142). In general, the more surface area that the discrete masses 176 contact, the greater the effect on the CT of the face portion 142. In one implementation, the discrete masses 176 are bonded directly to the face portion 142 such that the discrete masses 176 contact a certain amount of surface area of ​​the face portion (e.g., the inner surface 145 of the face portion 142). ... 2 , 150mm 2 , or 225mm 2 In embodiments having a plurality of discrete masses 176, the surface area of ​​the face portion 142 contacted by one of the discrete masses 176 may be different than another of the discrete masses 176. Further, in certain implementations having a plurality of discrete masses 176, the total surface area of ​​the face portion 142 contacted by the discrete masses 176 may be at least 100 mm 2 , 800mm 2 , or 1600mm 2 According to certain implementations, the ratio of the surface area of ​​the face portion 142 contacted by one or more discrete masses 176 to the total interior surface area of ​​the face portion 142 (e.g., the total surface area of ​​the inner surface 145) may be at least 0.01, 0.05, or 0.1, for example. In some implementations, the total surface area of ​​the face portion 142 may be at least 2,500 mm2 ~6,000mm 2 The striking plate 143 is 2,600 mm in some implementations. 2 ~3,300mm 2 may have a total surface area of

[0280] In embodiments having multiple discrete masses 176, the material of one discrete mass 176 can be different from another discrete mass 176. For example, one discrete mass 176 can have a different elastic modulus or hardness than another discrete mass 176, with such difference depending on the corresponding location of the discrete mass 176 relative to the face portion 142. In one implementation, a discrete mass 176 offset in a toe direction from the center of the face portion 142 can have a higher elastic modulus or higher hardness than a discrete mass 176 in a heel direction from the center of the face portion 142.

[0281] 18, the discrete masses 176 can be applied to the inner surface 145 of the face portion 142 using any of a variety of techniques, such as injecting the polymer material in a fluid state using an injection tool (e.g., see injection tool 177 in FIG. 17) and allowing the polymer material to cool or harden. Because the polymer material is injected in a fluid state, the polymer material is not under compression. In one implementation of the golf club head 100 having the crown insert 126, the discrete masses 176 are applied to the inner surface 145 of the face portion 142 after the frame 124 is formed but before the crown insert 126 is attached to the frame 124. More specifically, the discrete masses 176 can be applied to the inner surface 145 of the face portion 142 after the frame 124 is formed and before the crown insert 126 is attached to the frame 124, using access through the crown opening 162. Alternatively, the discrete masses 176 can be applied to the inner surface 145 of the face portion 142 after the body 110 is fully formed (e.g., after the crown insert 126 is attached to the frame 124 of the body 110) by accessing the interior cavity 113 through one or more ports formed in the body 110. For example, with reference to FIG. 17 , an injection tool 177 can be formed in an outer wall of the body 110 (e.g., a wall of the face portion 142) and can inject polymeric material onto the inner surface 145 of the face portion 142 through an opening 172 that opens into the interior cavity 113.

[0282] 16 and 17, the discrete masses 176 may also be bonded directly to an inner surface of the slot 170 of the golf club head 100 and interposed between the slot 170 and the face portion 142. The discrete masses 176 provide a reinforcing bridge to structurally connect the face portion 142, and particularly the lip 147, to the slot 170.

[0283] As shown, in some embodiments, the golf club head 100 includes at least one retaining wall 180 coupled to the sole portion 117. The retaining wall 180 projects upright from the sole portion 117. Moreover, the retaining wall 180 can have a thin-walled structure and extend longitudinally in a heel-toe direction (e.g., substantially parallel to the face portion 142). In some examples, the bottom region 135 of the golf club head 100 includes a single retaining wall 180 that can extend from the heel region 116 to the toe region 114. However, in other examples, the bottom region 135 of the golf club head 100 includes a plurality of separate retaining walls 180 spaced apart from one another in the heel-toe direction, as shown in FIG. 16 . Each separate retaining wall 180 is associated with a respective one of the discrete masses 176. In some implementations, the retaining wall 180 is a separate structure. However, in other implementations, the retaining wall 180 is integrated into another structure. For example, the retaining wall 180 can form a portion of the slot 170. In certain implementations, such as shown in Figures 16 and 17, the retaining wall 180 projects from the slot 170 at a front wall of the slot 170 such that the retaining wall 180 projects further from the sole portion 117 than the slot 170. Although not shown, the golf club head 100 may also have one or more retaining walls projecting upright from the crown portion 119.

[0284] The retaining wall 180 not only provides a structure to which one or more discrete masses 176 may be structurally coupled, but also aids in locating the discrete masses 176 higher on the face 142 at the bottom region 135 and / or lower on the face 142 at the top region 133 by providing backing at those higher or lower locations. In general, the closer a discrete mass 176 is in contact with the face 142 at a given x-axis location, the greater the impact the discrete mass 176 will have on lowering the CT of the striking plate 143 at that location. Thus, by locating the discrete mass 176 closer to the center of the striking plate 143, the CT of the striking plate 143 can be correspondingly lowered.

[0285] Corresponding to the above, the further away the discrete masses 176 are in contact with the face portion 142 at a given x-axis location relative to the center of the striking plate 143, the less effect the discrete masses 176 have on lowering the CT of the striking plate 143 at that location. Thus, in some implementations, such as shown in FIG. 18 , the reinforcement 150 includes both the discrete masses 176 and a foam 184. When the reinforcement 150 is located in the bottom region 135, the foam 184 is located between the discrete masses 176 and the sole portion 117. Additionally, when the reinforcement 150 is located in the top region 133, the foam 184 is located between the discrete masses 176 and the crown portion 119. As shown, when the golf club head 100 includes the slots 170 or retaining wall 180, the foam 184 is located between the slots 170 or retaining wall 180 and the face portion 142.

[0286] The foam 184 provides a platform (e.g., acts as a spacer) to locate the discrete masses 176 higher on the face 142 in the bottom region 135 or lower on the face 142 in the top region 133. The foam 184 is lighter than the polymeric material of the discrete masses 176. Thus, by effectively replacing some of the discrete masses 176 of FIG. 17 with the foam 184, the overall weight of the stiffener 150 can be reduced without sacrificing the CT reduction performance of the stiffener 150. In some implementations, the foam 184 of each stiffener 150 is a separate piece of foam such that the foam 184 of one stiffener 150 is separate from the foam 184 of another stiffener 150. The foam 184 can be any of a variety of types of foams, such as polyurethane, polyethylene, etc., that have a lightweight cellular morphology resulting from the introduction of air bubbles during manufacture.

[0287] The foam 184 of each stiffener 150 may be applied to the inner surface 145 of the body 110, such as the sole portion 117, crown portion 119, and / or face portion 142, using any of a variety of techniques, such as adhesive. In other words, the foam 184 may be glued to the inner surface 145 of the body 110. The discrete masses 176 may then be applied over the foam 184 using the same or similar techniques as described above in connection with FIGS. 16 and 17. In one implementation of the golf club head 100 having the crown insert 126, the foam 184 is bonded to the inner surface 145 of the body 110 after the frame 124 is formed and the striking plate 143 is bonded to the lip 147 (whether attached to the lip 147 or integrally formed with the lip 147), but before the crown insert 126 is bonded to the frame 124. More specifically, after the frame 124 is formed and the striking plate 143 is in place on the body 110, but before the crown insert 126 is attached to the frame 124, access through the crown opening 162 can be utilized to secure the foam 184 to the inner surface 145 of the body. Thus, when the striking plate 143 is welded to the lip 147, the heat from the welding process will not melt the foam 184 because the foam 184 is not secured to the body 110 until the striking plate 143 is welded to the lip 147 and the weld has cooled. Additionally, due to the cellular, lightweight nature of the foam 184, it does not significantly impact the acoustics of the golf club head 100.

[0288] 19-21, the foam 184 of the stiffener 150 can be formed into an enclosure 186 made of foam. As shown, the enclosure 186 can be configured (e.g., molded) for seating or complementary engagement with an inner surface of the body 110. The foam of the enclosure 186 can be the same types of foams as described above in connection with the foam 184. The enclosure 186 defines a cavity 188 having a side that opens to the face portion 142. More specifically, in one example, the enclosure includes a base 187 secured directly to an inner surface of the body 110 at the sole portion 117, the crown portion 119, or the skirt portion 121. One or more walls 189 protrude from the base 187 and together with the base 187 define the cavity 188. The base 187 and wall 189 of the enclosure 186 abut the inner surface of the face portion 142 such that the inner surface of the face portion 142 effectively closes the open side of the cavity 188, while the open end of the cavity 188 remains open. Thus, the cavity 188 has a closed end defined by the base 187, an open end opposite the closed end, at least one closed side defined by a wall 189 of the enclosure 186, and one open side that is open to the face portion 142. In the illustrated implementation, the base 187 is quadrilateral and the enclosure 186 includes three walls 189 that project orthogonally from the base 187. Thus, in the illustrated implementation, the cavity 188 is substantially square in shape. However, in other implementations, the enclosure 186 and the cavity 188 can have any of a variety of shapes, so long as the cavity 188 has a side that is open to the face portion 142.

[0289] The discrete masses 176 of the stiffener 150 are positioned and held within a cavity 188 of the enclosure 186. Similar to the foam 184, the base 187 of the enclosure 186 provides a platform for placing the discrete masses 176 higher on the face 142 in the bottom region 135 or lower on the face 142 in the top region 133. The walls 189 of the enclosure 186 serve to hold and position the discrete masses 176 in a location on the face 142 where CT adjustability is desired. Although not specified as such, the foam 184 in FIG. 18 can be part of the enclosure, similar to the enclosure 186. For example, the side walls 189 of the enclosure can be used to hold the discrete masses 176 laterally while the retaining walls 180 and / or slots 170 hold the discrete masses 176 rearward. Thus, in some implementations, the foam 184 directly contacts the retaining wall 180 and / or the slots 170 to form a seal to prevent the discrete masses 176 from leaking between the foam 184 and / or the slots 170 .

[0290] 19 , in some implementations, the golf club head 100 includes a plurality of enclosures 186 and a plurality of corresponding discrete masses 176 spaced apart from one another in a direction parallel to the x-axis of a golf club head origin coordinate system 185. The plurality of enclosures 186 may be disposed in the bottom region 135 and / or the top region 133 of the golf club head 100.

[0291] In one implementation of the golf club head 100 having the crown insert 126, the enclosure 186 is coupled to the inner surface 145 of the body 110 after the frame 124 is formed and the striking plate 143 is coupled to the lip 147 (whether attached to the lip 147 or formed integral therewith), but before the crown insert 126 is attached to the frame 124. More specifically, after the frame 124 is formed and the striking plate 143 is in place on the body 110, but before the crown insert 126 is attached to the frame 124, access through the crown opening 162 can be used to secure the enclosure 186 to the inner surface 145 of the body.

[0292] The discrete masses 176 can be applied into the cavity 188 of the enclosure 186 using the same or similar techniques as described above with respect to FIGS. 16 and 17. For example, the discrete masses 176 can be injected into the cavity 188 through the crown openings 162 before the crown insert 126 is attached to the frame 124 of the golf club head 100. Alternatively, the discrete masses 176 can be injected into the cavity 188, for example, through openings 172 formed in the outer wall of the body 110 (see, for example, openings 172 in FIG. 23). In some implementations, the openings 172 are aligned with openings 173 formed in the base 187 that open into the cavity 188 of the enclosure 186. In other words, the openings 173 in the base 187 effectively form a continuation of the openings 172. In this manner, the injection tool 177 can inject the polymer material through the opening 172 in the outer wall of the body 110 and through the opening 173 in the base 187 of the enclosure 186 and into the cavity 188 of the enclosure 186 (see, e.g., FIG. 23). After the polymer material is injected and hardened, the opening 172 can be plugged with the polymer material or another material, such as aluminum or titanium.

[0293] 22 and 23, in some embodiments, the foam enclosures of the multiple stiffeners 150 are effectively combined to form a unitary, continuous, monolithic structure. In other words, the enclosures combine to form an enclosure ladder, while the discrete masses 176 and cavities 188 of each of the multiple stiffeners 150 are spaced apart from one another in a direction parallel to the x-axis of the golf club head origin coordinate system 185. The enclosure ladder 190 includes a single piece of foam having a plurality of spaced apart cavities 188 formed in the foam. The cavities 188 are formed in the enclosure ladder 190 at desired locations of the discrete masses 176 on the face portion 142. The golf club head 100 may include multiple enclosure ladders, such as one (or more) enclosure ladders 186 disposed at the bottom region 135 of the golf club head 100 and / or one (or more) enclosure ladders 186 disposed at the top region 133 of the golf club head 100. The enclosure ladders 190 shown in FIG. 23 include five and seven cavities 188, respectively, although in other embodiments, each enclosure ladder 190 may include less than five, six, or more than seven cavities 188. Each enclosure ladder 190 may include any number of cavities 188.

[0294] The enclosure ladder 190 is coupled to the inner surface 145 of the body 110 after the frame 124 is formed and the striking plate 143 is coupled to the lip 147 (whether attached to the lip 147 or formed integral therewith), but before the crown insert 126 is attached to the frame 124. More specifically, after the frame 124 is formed and the striking plate 143 is in place on the body 110, but before the crown insert 126 is attached to the frame 124, access through the crown opening 162 can be utilized to secure the enclosure ladder 190 to the inner surface of the body.

[0295] The discrete masses 176 can be applied into the cavity 188 of the enclosure 186 using the same or similar techniques as described above with respect to FIGS. 16 and 17. For example, the discrete masses 176 can be injected into the cavity 188 through the crown openings 162 before the crown insert 126 is attached to the frame 124 of the golf club head 100. Alternatively, for example, the discrete masses 176 can be injected into the cavity 188 through openings 172 (see, for example, openings 172 in FIG. 23) formed in an outer wall of the body 110. In some implementations, the openings 172 are aligned with openings 173 formed in the base 187 that open into the cavity 188 of the enclosure 186. In other words, the openings 173 in the base 187 effectively form a continuation of the openings 172. In this manner, the injection tool 177 can inject polymer material through the opening 172 in the outer wall of the body 110 and the opening 173 in the base 187 of the enclosure 186 and into the cavity 188 of the enclosure 186 (see, for example, FIG. 23).

[0296] In some examples, as shown in FIGS. 24-27, the stiffeners 150 of the golf club head 100 include fasteners 198. The fasteners 198 of each stiffener 150 are at least partially within the internal cavity 113 of the body 110. For example, a portion of the fasteners 198 in the top region 133 of the golf club head 100 is disposed outside the internal cavity 113 and another portion of the fasteners 198 is disposed inside the internal cavity 113. Such fasteners 198 are engageable by an adjustment tool at a location outside the internal cavity 113. In other examples, such as the fasteners 198 in the bottom region 135 of the golf club head 100, the entire fasteners 198 are disposed inside the internal cavity 113. Such fasteners 198 are engageable by an adjustment tool at a location inside the internal cavity 113. The fasteners 198 can be any of a variety of types of fasteners, such as screws, bolts, nails, pins, nuts, washers, pegs, and the like. In one implementation, the fastener 198 is a threaded fastener (ie, a threaded fastener) having a head portion engageable by the adjustment tool 200 and a threaded shank extending from the head portion.

[0297] The fasteners 198 are adjustably coupled to the body 110 and are adjustable to contact the inner surface 145 of the face portion 142 at a location LF away from the outer periphery 181 of the face portion 142 where adjustability of the CT is desired. In some implementations, the fasteners 198 are adjustable to position the fasteners 198 in contact with the inner surface 145 of the face portion 142 and out of contact with the inner surface 145 of the face portion 142. However, in other implementations, the fasteners 198 remain in contact with the inner surface 145 of the face portion 142 and the contact area of ​​the fasteners 198 with the inner surface 145 is adjustable. The fasteners 198 of each stiffener 150 can be adjustably coupled to the body 110 in any of a variety of ways. In some implementations, the location LF is at least 5 mm, 10 mm, 15 mm, 20 mm, or 30 mm, depending on the lateral location of the fasteners 198 on the face portion and the desired reduction in the CT of the face portion 142.

[0298] In one example shown in FIG. 24 , fasteners 198 of stiffeners 150 in section region 135 of golf club head 100 are adjustably coupled to body 110 using fastener ribs 194 or tabs. Fastener ribs 194 are non-movably attached to or integrally formed with body 110 of golf club head 100 and protrude from an inner surface of body 110 into interior cavity 113 of body 110. Fastener ribs 194 include openings 196 through which fasteners 198 pass. Openings 196 support fasteners 198 as fasteners 198 are adjusted relative to body 110. In one implementation, fasteners 198 are threaded fasteners, openings 196 are threaded holes, and fasteners 198 threadably engage openings 196. According to such implementations, the threaded engagement between the fastener 198 and the opening 196 translates the fastener 198 toward or away from the face portion 142 as the fastener 198 rotates relative to the fastener rib 194. The fastener 198 may be rotated using an adjustment tool 200, which may be any of a variety of fastener adjustment tools known in the art, such as a screwdriver, ratchet, drill, wrench, and the like. As shown, in some implementations, the fastener 198 is accessible by the adjustment tool 200 through a port 192 formed in the body 110 of the golf club head 100. The port 192 may be a dedicated stiffener adjustment port or a port designed for other uses, such as a weight port for holding an adjustable weight. The port 192 may be located at a desired location on the body 110, such as the skirt portion 121 of the rear region 118 of the golf club head 100. In certain implementations, when the fastener 198 is disposed completely within the internal cavity 113 , the adjustment tool 200 is configured to extend through the port 192 and through the internal cavity 113 to engage the fastener 198 .

[0299] 25, the golf club head 100 can have any number of fastener ribs 194. Additionally, while each fastener rib 194 is shown supporting one fastener 198, in some implementations, one fastener rib 194 can support two or more fasteners 198. Also, while only the reinforcement 150 in the bottom region 135 is shown including fastener ribs 194, it will be recognized that the reinforcement 150 in the top region 133 can also include fastener ribs 194.

[0300] According to another example, also shown in FIG. 24 , the fastener 198 of the stiffener 150 in the top region 133 of the golf club head 100 is adjustably coupled to the body 110 using a fastener port 202 in the body 110. The fastener port 202 is integrally molded with the body 110. Moreover, the fastener port 202 is configured to directly engage and support the fastener 198 as the fastener 198 is adjusted relative to the body 110. For example, in some implementations, the fastener 198 is a threaded fastener, the fastener port 202 is threaded, and the fastener 198 threadably engages with the fastener port 202. According to such implementations, as the fastener 198 rotates relative to the fastener port 202, the threaded engagement between the fastener 198 and the fastener port 202 causes the fastener 198 to translate toward or away from the face portion 142. The face portion 142 may include a ledge 204 or shoulder configured to receive an end of the fastener 198 as the fastener 198 rotates toward the face portion 142 .

[0301] The fasteners 198 can be rotated with an adjustment tool 200. As shown, in some implementations, when a portion of the fasteners 198 is outside of the internal cavity 113, the fasteners 198 can be accessed by the adjustment tool 200 from outside of the internal cavity 113 by engaging a portion of the fasteners 198 outside of the internal cavity 113. Fastener Port 202. The fastener port 202 can be located anywhere on the body 110 as desired.

[0302] 25, the golf club head 100 may have any number of fastener ports 202 and corresponding fasteners 198. Also, while only the stiffeners 150 in the top region 133 are shown as including fastener ports 202, it will be recognized that the stiffeners 150 in the bottom region 135 may also include fastener ports 202 in lieu of the fastener ribs 194.

[0303] 26, the golf club head 100 includes side fastener ports 210. Each side fastener port 210 is similar to the fastener port 202. The fasteners 198 of each stiffener 150 are adjustably coupled to the body 110 using a respective one of the side fastener ports 210. The fastener ports 210 are integrally molded with the body 110. As shown, each side fastener port 210 is formed on a side of the golf club head 100, for example, on the toe region 114 of the forward region 112, or on the skirt portion 121 of the heel region 116, or on the sole portion 117. The fastener ports 210 are inclined with respect to the y-axis of the club head origin coordinate system 185. Meanwhile, the fasteners 198 of the reinforcements 150 are adjustably coupled to the body 110 using a respective one of the side fastener ports 210. The port 192 and / or the fastener port 202 may be substantially parallel to the y-axis of the club head origin coordinate system 185 in some implementations.

[0304] The fastener port 210 is configured to directly engage and support the fastener 198 as the fastener 198 is adjusted relative to the body 110. For example, in some implementations, the fastener 198 is a threaded fastener, the fastener port 210 is threaded, and the fastener 198 threadably engages with the fastener port 210. According to such implementations, as the fastener 198 rotates relative to the fastener port 210, the threaded engagement between the fastener 198 and the fastener port 210 causes the fastener 198 to translate toward or away from the face portion 142.

[0305] The fasteners 198 can be rotated with an adjustment tool 200. As shown, in some implementations, when a portion of the fasteners 198 is outside of the internal cavity 113, the fasteners 198 can be accessed by the adjustment tool 200 from outside of the internal cavity 113 by engaging a portion of the fasteners 198 outside of the internal cavity 113. Fastener Port 202. The fastener port 202 can be located anywhere on the body 110 as desired.

[0306] 26, the fastener 198 has a rounded end surface 230 in some implementations. The fastener 198 of FIG. 26 is adjustable to adjust the size of the area of ​​the rounded end surface 230 of the fastener 198 that contacts the inner surface 145 of the face portion 142. In other words, the fastener 198 is translatable toward the face portion 142 to increase the area of ​​the rounded end surface 230 that contacts the inner surface 145 of the face portion 142, and is translatable away from the face portion 142 to decrease the area of ​​the rounded end surface 230 that contacts the inner surface 145 of the face portion 142. Due to the variation in Hertzian contact stress caused by adjusting the size of the area of ​​the rounded end surface 230 that contacts the inner surface 145, the stiffness of the face portion 142 may correspondingly change (e.g., may be gradually adjustable).

[0307] According to another example shown in FIG. 27, the stiffness of the face portion 142 may be gradually adjustable using a spring element 220. More specifically, the reinforcement 150 of the golf club head 100 of FIG. 27 includes a spring element 220 disposed between a rib 194 and a washer 222. The reinforcement 150 further includes a washer 222, a spring element 220, and a fastener 198 extending through an opening 196 in the rib 194. Through adjustment of the fastener 198 (such as by the adjustment tool 200), as the fastener 198 translates toward the face portion 142, the fastener 198 causes the washer 222 to compress the spring element 220 against the rib 194. Meanwhile, through adjustment of the fastener 198, as the fastener 198 translates away from the face portion 142, the spring element 220 is allowed to decompress. The stiffness or resilience of the spring element 220 gradually changes as the spring element 220 is gradually compressed or decompressed. For example, as the spring element 220 is gradually compressed more, the stiffness of the spring element 220 gradually increases and the elasticity of the spring element 220 gradually decreases. However, as the spring element 220 is gradually decompressed more, the stiffness of the spring element 220 gradually decreases and the elasticity of the spring element 220 gradually increases. In some implementations, the spring element 220 is a solid block of a polymeric material, such as acrylic.

[0308] The ends of the fasteners 198 of the stiffeners 150 of FIG. 27 directly engage the face portion 142 at the locations where CT adjustability is desired. In some implementations, the ends of the fasteners 198 of the stiffeners 150 of FIG. 27 permanently engage the face portion 142. For example, the face portion 142 can include recesses 197 formed in the inner surface 145 of the face portion 142 configured to receive the ends of the fasteners 198. The recesses 197 can be threaded to threadably mate with the ends of the fasteners 198. The fasteners 198 structurally couple the face portion 142 to the spring elements 220 such that the local stiffness of the face portion 142 where the ends of the fasteners 198 contact the face portion 142 matches the stiffness of the spring elements 220. Therefore, as the stiffness of the spring element 220 gradually increases through adjustment of the fastener 198, the CT of the face portion 142 where the end of the fastener 198 contacts the face portion 142 correspondingly gradually decreases. On the other hand, as the stiffness of the spring element 220 gradually decreases through adjustment of the fastener 198, the CT of the face portion 142 where the end of the fastener 198 contacts the face portion 142 correspondingly gradually increases.

[0309] The stiffeners 150 of the golf club heads 100 of the present disclosure advantageously facilitate reducing the CT of the golf club heads 100 at locations having x-axis coordinates toe and / or heel away from the origin 183 without significantly affecting the CT of the golf club heads 100 at locations having x-axis coordinates proximate to the x-axis coordinate of the origin 183. In some embodiments, the stiffeners 150 of the golf club heads 100 can be adjusted to adjust the CT after a batch of golf club heads 100 is manufactured to further facilitate reducing the standard deviation of the CT away from the target CT at the center face of the striking plate 143 and at locations +20 mm and -20 mm horizontally away from the center face for a manufactured batch of golf club heads 100. Reducing the standard deviation allows a given batch of manufactured golf club heads 100 to have a CT closer to the target CT, which allows for the selection of a target CT closer to a prescribed CT threshold for the golf club heads 100. For example, if the CT of a given batch of golf club heads 100 does not meet a prescribed CT threshold after manufacture, one or more stiffeners 150 of the golf club heads 100 can be adjusted to adjust the CT so that the prescribed CT threshold is met. Similarly, if the CT of a given batch of golf club heads 100 does not meet a target CT after manufacture, one or more stiffeners 150 of the golf club heads 100 can be adjusted to adjust the CT so that the target CT is achieved.

[0310] Thus, the standard deviation for a batch of golf club heads 100 can be based on the adjustable range of CT for the batch of golf club heads 100. In one embodiment, the standard deviation is about 2 microseconds. According to another embodiment, the standard deviation is about 1 microsecond to about 4 microseconds. The target CT is, in one example, 235 microseconds to 257 microseconds, in another example, 240 microseconds to 250 microseconds, and in yet another example, about 247 microseconds. According to some embodiments, the target CT is 1 microsecond to 20 microseconds below the prescribed CT threshold. In one example, the target CT is about 10 microseconds below the prescribed CT threshold. According to yet another embodiment, the target CT is 0.4% to 7.8% below the prescribed CT threshold. In one example, the target CT is about 4% below the prescribed CT threshold.

[0311] According to some embodiments, the reinforcement 150 of the golf club head 100 is adjusted by removing material from the reinforcement 150 to adjust the CT of the golf club head 100. Removing a portion of one or more ribs 152 of the golf club head 100 of FIG. 12, such as by using a material removal tool 240, locally increases the CT. The material removal tool 240 can be any of a variety of tools, such as drills, grinders, sanders, etc., configured to cut, shear, grind, etc., metal material. The material removal tool 240 can access the ribs 152 through the openings 172 formed in the outer wall of the body 110 of the golf club head 100. Thus, the entire golf club head 100, including the ribs 152 and the openings 172, can be manufactured. The manufactured golf club head 100 can then be tested for CT. If the tested CT of the manufactured golf club head 100 is lower than the target CT, material may be removed from one or more of the ribs 152 until the CT of the manufactured golf club head 100 is increased to the target CT. After material is removed from the ribs 152, the corresponding openings 172 may be permanently or non-permanently blocked in preparation for actual use of the golf club head 100 by an end user. In some implementations, the openings 172 may be non-permanently blocked prior to removing material from the ribs 152 and then permanently or non-permanently blocked after removing material from the ribs 152.

[0312] According to some embodiments, the reinforcement 150 of the golf club head 100 is adjusted and the CT of the golf club head 100 is adjusted by adding material to the reinforcement 150. For example, referring to the golf club head 100 of FIGS. 13-23, adding a polymeric material to the golf club head 100, such as by using an injection tool 177, to form or add one or more discrete masses 176 locally reduces the CT. The locations of the discrete masses 176 for forming or adding the discrete masses 176 can be accessed through the openings 172 formed in the outer wall of the body 110 of the golf club head 100. Thus, the entire golf club head 100 of FIGS. 13-23 can be manufactured, including the openings 172, and including the attachment of the foam 184, enclosure 186, or enclosure ladder 190. The manufactured golf club head 100 can then be tested for CT. If the test CT of the manufactured golf club head 100 is higher than the target CT, polymer material may be added to form or expand one or more discrete masses 176 until the CT of the manufactured golf club head 100 is reduced to or below the target CT. After the polymer material is added to the golf club head 100 through one or more openings 172, the corresponding openings 172 may be permanently or non-permanently blocked in preparation for actual use of the golf club head 100 by an end user. In some implementations, the openings 172 may be non-permanently blocked prior to removing material from the ribs 152 and then permanently or non-permanently blocked after removing material from the ribs 152.

[0313] According to some implementations, more precise tuning of the CT can be achieved by varying the amount or type of polymer material added to the golf club head 100 of FIGS. 12-23 to form the discrete masses 176. In some implementations, the polymer material of all of the discrete masses 176 of the golf club head 100 is the same, while the amount of polymer material of at least one of the discrete masses 176 is different from another of the discrete masses 176. For example, testing of the manufactured golf club head 100 may reveal a need to reduce the CT more at one location on the face portion 142 than another location. Thus, more polymer material can be added to one location (i.e., a larger discrete mass 176 can be formed) compared to the other locations. In other implementations, the amount of polymer material of the discrete masses 176 is the same, but the type of polymer material of at least one of the discrete masses 176 is different from the other of the discrete masses 176. For example, testing of the manufactured golf club head 100 may reveal a need to reduce the CT more at one location on the face portion 142 than another location. Thus, a polymer material having a higher hardness may be added to one location compared to the polymer material at another location. In one particular example, the type of polymer material added to the cavities 188 of the enclosure ladder 190 varies from cavity to cavity, with the hardness of the polymer material becoming progressively higher the further away from the origin 183 in the toe direction and the further away from the origin 183 in the heel direction.

[0314] According to some embodiments, the reinforcement 150 of the golf club head 100 of FIGS. 24-27 is adjusted by adjusting the fastener 198 of the reinforcement 150 to adjust the CT of the golf club head 100. The entire golf club head 100 of FIGS. 24-27 including the reinforcement 150 can be manufactured. The CT of the manufactured golf club head 100 can then be tested. If the test CT of the manufactured golf club head 100 is higher than the target CT, the fastener 198 can be adjusted, such as by using an adjustment tool 200, to either bring the fastener 198 into contact with the face portion 142, increase the area of ​​the fastener 198 in contact with the face portion 142, and / or further compress the spring element 220 until the CT of the manufactured golf club head 100 is equal to or lower than the target CT.

[0315] In some implementations, more precise adjustment of the CT can be achieved by independently and differently adjusting the fasteners 198 of the stiffeners 150 of a given golf club head 100 of FIGS. 12-23. For example, one of the fasteners 198 of the golf club head 100 can be adjusted to contact the face portion 142 while the other fasteners 198 of the golf club head 100 remain out of contact with the face portion 142. As another example, the fasteners 198 of a given golf club head 100 can be adjusted differently such that the area of ​​one fastener 198 in contact with the face portion 142 can be different than the area of ​​the other fastener 198 in contact with the face portion 142. Furthermore, in an additional example, the fasteners 198 of a given golf club head 100 can be adjusted differently such that the spring elements 220 of one stiffener 150 of the golf club head 100 are compressed differently than the spring elements 220 of another stiffener of the golf club head 100.

[0316] Referring to FIG. 29, according to one embodiment, a method 300 for adjusting the CT of a golf club head, such as golf club head 100, after manufacturing of the golf club head is disclosed. As defined herein, a manufactured golf club head, or a manufactured golf club head, is a fully functional golf club head having a fully formed body. Except for possible ports for securing weights or plugs, the body of the manufactured golf club head is completely enclosed. According to another definition, except for the possibility of not meeting a prescribed CT threshold, the manufactured golf club head meets all other prescribed thresholds, such as those prescribed by the USGA.

[0317] The method 300 may first include, at 302, manufacturing a golf club head. The manufactured golf club head includes at least one stiffener, such as stiffener 150, for adjusting a CT of the golf club head. The stiffener is at least partially within an internal cavity of the golf club head and may be directly bonded to a face portion of the golf club head. The method 300 further includes, at 304, testing the golf club head to determine a CT of the golf club head. The CT test utilized at 304 of the method 300 may be a pendulum-based CT test standardized by the USGA. The method 300 further includes, at 306, determining whether the CT of the golf club head determined by testing at 304 meets a desired or target CT. If the CT of the golf club head meets the target CT at 306, the method 300 ends. However, if the CT of the golf club head does not meet the target CT, the method 300 may, at 308, adjust the stiffener of the golf club head to adjust the CT of the golf club head. In some implementations, after adjusting the stiffeners at 308, the method 300 again tests the golf club head to determine the CT of the golf club head at 304 and continues from there.

[0318] Tailoring the at least one reinforcement of the golf club head at 308 can be accomplished in a number of different ways depending on the configuration of the reinforcement. For example, if the reinforcement is a rib directly bonded to the face of the golf club head (see, e.g., FIGS. 7-12), tailoring the reinforcement at 308 includes removing material from the at least one rib through a port formed in the body of the golf club head. As another example, if the reinforcement includes discrete masses directly bonded to the face of the golf club head (see, e.g., FIGS. 13-23), tailoring the reinforcement at 308 includes adding a polymeric material, such as one having a hardness of about Shore 10D or greater, to the at least one reinforcement through a port or opening formed in the body of the golf club head. According to yet another example, where the stiffener is at least partially within an interior cavity of the golf club head and includes a fastener adjustably coupled to a body of the golf club head (e.g., see FIGS. 24-27), adjusting the stiffener at 308 includes adjusting (e.g., rotating) it into contact with a face portion of the golf club head or adjusting the fastener while in contact with the face portion of the golf club head.

[0319] Referring to FIG. 30, according to one implementation, the CT of a golf club head constructed according to golf club head 100 was adjusted after manufacturing of the golf club head and tested before and after adjustment. The CT adjustment was accomplished by injecting 1 gram of polymer material through opening 172 on the toe side and heel side of face portion 142, respectively. In this exemplary implementation, the polymer material was Scotch Weld Epoxy Adhesive DP420 manufactured by 3M. The epoxy adhesive may be a two-part epoxy adhesive. The injected polymer material was held within respective enclosures made of foam, similar to enclosure 186, such that discrete chunks of the polymer material contacted the inner surface of face portion 142 as described above. The polymer material was then allowed to cure.

[0320] The CTs at three points A, B, and C on the striking face of the striking plate 143 were experimentally obtained before and after injecting and curing the polymeric material. Point A was located at the center face, point B was located 20 mm in the toe direction from point A, and point C was located 20 mm in the toe direction from point A. Before injecting and curing the polymeric material, the CT at point A was 256 microseconds, the CT at point B was 267 microseconds, and the CT at point C was 245 microseconds. After injecting and curing the polymeric material, the CT at point A was 249 microseconds (or 7 microseconds or less), the CT at point B was 251 microseconds (or 16 microseconds or less), and the CT at point C was 247 microseconds (or 2 microseconds or more). Thus, the injection of the polymeric material resulted in a significant reduction in the CT at points A and B, and a substantially identical CT at point C.

[0321] 31A and 32A, in another embodiment, the golf club head 100 includes a stiffener 254. The location of the stiffener 254 relative to the center of the face portion 142 may be similar to the location of the stiffener 150 described above in connection with FIGS. 3-6. The stiffener 254 forms part of a stiffener assembly 260 that is comprised of a first wall 252, a second wall 250, and a third wall 251. Thus, the stiffener assembly 260 includes the first wall 252, the second wall 250, the third wall 251, and the stiffener 254.

[0322] The first wall 252 projects upright from the sole portion 117 of the body 110. In some instances, the first wall 252 extends perpendicularly from the sole portion 117, and in other instances, the first wall 252 may form an acute or obtuse angle with the portion of the sole portion 117 from which the first wall 252 projects. The first wall 252, in some instances, is formed separately from the body 110 and attached to the body 110, such as by welding or bonding techniques. However, in other instances, the first wall 252 is integrally formed with the body 110 such that the body 110 is one piece and forms a continuous monolithic structure. In specific examples, the first wall 252 has a thin-walled construction such that the thickness of the first wall 252 is significantly less than the length and height of the first wall 252. The first wall 252 extends longitudinally in a generally heel-to-toe direction that may be parallel to the x-axis of the golf club head origin coordinate system 185 or angled relative to the x-axis of the golf club head. For example, in some implementations, the first wall 252 defines angles with the x-axis of the golf club head of -30° to -15° and 15° to 30°.

[0323] As shown in FIG. 31A, the first wall 252 has a length L5. The length L5 is less than the total length L3 of the face portion 142. In other words, the first wall 252 is a separate wall with respect to the total length L3 of the face portion 142. According to another example, the length L5 is less than the total length L4 of the entire section of the face portion 142 adjacent to (e.g., abutting or directly connected to) the sole portion 117 of the body 110. Thus, the first wall 252 can also be a separate wall with respect to the total length L4 of the entire section of the face portion 142 adjacent to the sole portion 117. In one example, the length L5 of the first wall 252 is less than 30 millimeters.

[0324] The first wall 252 is made of a first material having a first modulus of elasticity. In some examples, the first modulus of elasticity is between 15 and 350 GPa. According to other examples, the first modulus of elasticity is between 90 and 210 GPa. In one example, the first modulus of elasticity is the same as the modulus of elasticity of the body 110. For example, the first material can be one of titanium or steel. However, in other examples, the first material is different from that of the body 110 and the first modulus of elasticity is different from that of the body 110. By way of example, the first material can be a non-metal, such as a plastic or polymer. In general, the first wall 252 is stiffer than the second wall 250, the third wall 252, and the stiffener 254, as described in more detail below. For example, the stiffener 254 is made of a second material having a second modulus of elasticity that is less than the first modulus of elasticity. The first wall 252 has a relatively high elastic modulus in order to support the reinforcement member 254 when a load in the front-to-rear direction caused by the impact of a golf ball against the face portion 152 during a swing is applied to the reinforcement member 254.

[0325] Each of the second wall 250 and the third wall 251 projects upright from the sole portion 117 of the body 110. In some examples, each of the second wall 250 and the third wall 251 extends perpendicularly from the sole portion 117, and in other examples, each of the second wall 250 and the third wall 251 may form an acute or obtuse angle with the portion of the sole portion 117 from which the first wall 252 projects. In some examples, the second wall 250 and the third wall 251 are formed separately from the body 110 and attached to the body 110 by, for example, welding or bonding techniques. The second wall 250 and the third wall 251 extend in a longitudinal direction parallel to a front-to-rear direction that may be parallel to the y-axis of the golf club head origin coordinate system 185. The length of each of the second wall 250 and the third wall 251 is equal to the distance between the inner surface 145 of the face portion 142 and the first wall 252.

[0326] The second wall 250 and the third wall 251 are made of a third material having a third modulus of elasticity. The third modulus of elasticity is less than the first modulus of elasticity. In some examples, the third modulus of elasticity is between 0.01 GPa and 8.0 GPa. According to other examples, the third modulus of elasticity is between 0.05 GPa and 2.0 GPa. The third material is a foam in one example. In other examples, the third material is a relatively soft polymer or low strength metal. In general, the second wall 250 and the third wall 251 are configured to hold the stiffener 254 in place laterally, and the second wall 250 and the third wall 251 are less stiff than the first wall 252 because the lateral loads (e.g., heel-toe loads) on the stiffener 254 during a golf swing are less than the front-to-back loads on the stiffener 254.

[0327] The second wall 250 and the third wall 251 are spaced apart from each other in the heel-toe direction by a distance equal to the length L2 of the stiffener 254. In this manner, the second wall 250 and the third wall 251 help to laterally retain the stiffener 254 within the gap between the second wall 250 and the third wall 251.

[0328] The stiffener 254 is disposed within the internal cavity 113 of the body 110 and is directly bonded to the inner surface 145 of the face portion 142. The stiffener 254 helps to reduce the CT of the golf club head 100 compared to a golf club head without the stiffener 254. As shown in FIG. 31A, the stiffener 254 has a length L2. The length L2 is less than the total length L3 of the face portion 142. In other words, the stiffener 254 is a separate feature relative to the total length L3 of the face portion 142. According to another example, the length L2 is less than the total length L4 of the entire section of the face portion 142 adjacent (e.g., abutting or directly bonded to) the sole portion 117 of the body 110. Thus, the stiffener 254 can also be a separate wall relative to the total length L4 of the entire section of the face portion 142 adjacent to the sole portion 117. In one example, the length L2 of the stiffener 254 is less than 30 millimeters. According to a specific example, the length L2 of the stiffener 254 is less than or equal to the length L5 of the first wall 252.

[0329] As described above, the stiffener 254 is made of a second material having a second modulus of elasticity. The second modulus of elasticity is less than the first modulus of elasticity of the first material of the first wall 252 and greater than the third modulus of elasticity of the third material of the second wall 250 and the third wall 251. In some examples, the second modulus of elasticity is between 0.5 GPa and 30 GPa. According to other examples, the second modulus of elasticity is between 1 GPa and 5.0 GPa. The second material is acrylic in one example.

[0330] In the assembly 260, the stiffener 254 is disposed between the inner surface 145 of the face portion 142 and the first wall 252, and the stiffener 254 is disposed between the second wall 250 and the third wall 251. In some examples, the second wall 250 is directly coupled (e.g., abuts) to the inner surface 145 of the face portion 142 and is directly coupled to the first wall 252. Similarly, in some examples, the third wall 251 is directly coupled to the inner surface 145 of the face portion 142 and is directly coupled to the first wall 252. The second wall 250 and the third wall 251 can be directly coupled to the inner surface 145 and the first wall 252 by directly abutting the inner surface 145 and the first wall 252 or by being joined to the inner surface 145 and the first wall. The stiffener 254 is directly coupled to the first wall 252, the second wall 250, and the third wall 251. Thus, stiffener 254 is at least laterally confined or contained between inner surface 145, first wall 252, second wall 250, and third wall 251. In some examples, the maximum height of first wall 252, second wall 250, and third wall 251 is greater than the maximum height of stiffener 254.

[0331] According to another example shown in FIGS. 31B and 32B, the stiffener 254 of the stiffener assembly 260 of the golf club head 100 is not directly bonded to the inner surface of the body 110, which is in contrast to the golf club head 100 of FIGS. 31A and 32A, in which the stiffener 254 of the stiffener assembly 260 is directly bonded to the inner surface of the body 110. Rather, in the example of FIGS. 31B and 32B, the stiffener assembly 260 further includes a base 255 on which the stiffener 254 is supported relative to the body 110. In other words, the base 255 is disposed between the stiffener 254 and the inner surface of the body 110. The base 255 is directly bonded to the inner surface of the base 255 by adhesive or the like. The base 255 functions as a platform that helps the golf club head 100 to be positioned higher on the face portion 142 when disposed in the bottom region of the golf club head 100, and to be positioned lower on the face portion 142 when disposed in the top region of the golf club head 100. In some examples, the base 255 has a length equal to the length L2 of the stiffener 254. The base 255 is made of a fourth material having a fourth modulus of elasticity that is less than the second modulus of elasticity of the second material of the stiffener 254. According to examples, the fourth material is the same as the third material, and the fourth modulus of elasticity is the same as the third modulus of elasticity. Indeed, in some examples, the base 255 forms an integral, monolithic, seamless structure with the second wall 250 and the third wall 251.

[0332] In some examples of the golf club head 100 of FIGS. 31A and 32A and the golf club head 100 of FIGS. 31B and 32B, the stiffener assembly 260 does not include the second wall 250 or the third wall 251. As one example, the stiffener assembly 260 of the golf club head 100 includes only one of the second wall 250 or the third wall 251. In such an example, the golf club head 100 can be oriented during formation of the stiffener 254 such that the second wall 250 or the third wall 251 acts as a vertical lower stop against which the stiffener 254 gathers and hardens, which helps to eliminate the need for the other of the second wall 250 or the third wall 251. Alternatively, in another example, the stiffener assembly 260 does not include the second wall 250 and the third wall 251. In such an example, the reinforcement 254 is not formed in place in the golf club head 100 (e.g., by pouring a hardenable material into the golf club head 100), but rather the reinforcement 254 may be pre-formed and securely inserted in place between the first wall 252 and the inner surface 145 of the face portion 142.

[0333] As shown in FIGS. 31A, 32A, 31B, and 32B, the golf club head 100 includes a plurality of stiffener assemblies 260 in some examples. The stiffener assemblies 260 can be located at any of a variety of positions on the sole portion 117 and / or the crown portion 119. The plurality of assemblies 260 on the sole portion 117 are laterally spaced apart from one another in the heel-toe direction, and the plurality of assemblies 260 on the crown portion 119 are laterally spaced apart from one another in the heel-toe direction as well. According to some examples, each of the plurality of stiffener assemblies 260 is located in a toe or heel direction from the center of the face portion 142 such that the stiffener 254 is located at any of the various positions described above in connection with the stiffener 250. Furthermore, in some examples, the stiffener assemblies 260 of one golf club head 100 may be different from another stiffener assemblies 260 of the golf club head 100. For example, one stiffener assembly 260 may have a base 255 and another stiffener assembly 260 may not have a base 255. As another example, the elastic modulus of the first wall 252, the second wall 250, the third wall 251, or the base 255 of a stiffener assembly 260 of a golf club head 100 may be different than the elastic modulus of the first wall 252, the second wall 250, the third wall 251, or the base 255, respectively, of another stiffener assembly 260 of the same golf club head 100. Such flexibility in the configuration of one stiffener assembly 26 relative to another stiffener assembly 260 of the same golf club head 100 allows the impact of the stiffener assembly 260 to the CT at one location of the golf club head 100 to be different than at another location of the golf club head 100.

[0334] 33 and 34, one implementation of the golf club head 100 of FIGS. 31A and 32A is shown. In the golf club head 100 of FIGS. 33 and 34, the stiffener assembly 260 is configured similarly to that of the golf club head 100 of FIGS. 31A and 32A in one implementation. For example, in the golf club head 100 of FIGS. 33 and 34, the first wall 252 is a retaining wall 180 integrally molded with the body 110 of the golf club head, the second wall 250 is one wall 189 made of foam, the third wall 251 is the other wall 189 made of foam, and the stiffener 254 is a discrete mass 176 of polymeric material. Although not shown, in another implementation, the stiffener assembly 260 of the golf club head 100 of FIGS. 33 and 34 is configured to have a base 187 made of foam between the discrete masses 176 of polymeric material and the inner surface of the body 110, similar to that of the golf club head 100 of FIGS. 31B and 32B. The golf club head 100 of FIGS. 33 and 34 also includes openings 172 formed in the face portion 142 through which the polymeric material of the discrete masses 176 are respectively applied to form the stiffener assembly 260. Each opening 172 is plugged with a plug 179 after applying the polymeric material. In some examples, the golf club head 100 may include openings 172 and corresponding plugs 179 at any one or more of the locations shown in FIG. 46. According to an embodiment, the golf club head 100 may include openings 172 and corresponding plugs 179 at any two or more of the locations shown in FIG. 46. Additionally, in some examples, the golf club head 100 may include openings 172 and corresponding plugs 179 in all locations shown in FIG.

[0335] 50, according to some examples of the golf club head 100, the opening 172 extends through the face portion 142 from the striking face 144 to the inner surface 145. The opening 172 includes internal threads 193 and a counterbore 195 in the illustrative examples. The counterbore 195 is disposed between the internal threads 193 and the striking face 144. The counterbore 195 has a radial dimension greater than a maximum radial dimension of the internal threads 193. Additionally, the counterbore 195 has a depth DCB relative to the striking face 144. The plug 179 includes a shank 159 and a head 169. The shank 159 includes external threads 167 configured to threadably mate with the internal threads 193 of the opening 172. The head 169 has a radial dimension greater than a maximum radial dimension of the external threads 167. 51, the radial dimension of head 169 is equal to or just less than the radial dimension of counterbore 195 such that head 169 can be telescopically seated within counterbore 195 when male threads 167 are mated with female threads 193. Further, head 169 has a height HH.

[0336] 51, the plug 179 is fixed and held immovably within the opening 172. Generally, the plug 179 of FIGS. 50 and 51 is fixed and held immovably within the opening 172 when the male threads 167 are mated with the female threads 193 and the head 169 is fully seated against the counterbore 195. In some instances, an adhesive is applied between the male threads 167 and the female threads 193 to promote a secure attachment between the plug 179 and the opening 172.

[0337] When immovably secured and held within the opening 172, the outermost surface 157 of the plug 179, which in the example corresponding to FIGS. 50 and 51 is the outermost surface of the head 169, establishes a flushness with the striking face 144. The flushness can be quantified as a distance D that the outermost surface 157 protrudes from the striking face 144 (see, e.g., FIG. 52) or a distance D that the outermost surface 157 sinks or sinks below the striking face 144 (see, e.g., FIG. 53). In FIG. 51, the distance D is zero such that the outermost surface 157 is perfectly flush with the striking face 144. However, in some examples, the distance D is greater than zero such that the outermost surface 157 is not perfectly flush with the striking face 144. For example, in one implementation, the outermost surface 157 of the plug 179 protrudes from the striking face 144 by a distance D of 0.15 millimeters or less or sinks below the surface of the striking face by a distance D of 0.1 millimeters or less. Allowing for flushness within this range helps improve the performance of the golf club head by reducing potentially negative interactions with the golf ball upon impact.

[0338] According to one method, the desired flushness is achieved by determining a depth DCB of the counterbore 195 after the face portion 142 is formed. In response to the determined depth DCB, a plug 179 having a desired head height HH corresponding to the determined depth DCB is selected from a plurality of plugs 179, each having a different head height HH. After the plug 179 having the desired head height HH is selected, it is immovably fixed and held within the opening 172.

[0339] 54, in some examples, the plug 179 includes a portion of the reinforcement material. In one example, the reinforcement material is a discrete mass 176 of a polymer material, and the plug 179 is made of a portion of the polymer material. The polymer material is injected through the openings 172 to form the discrete masses 176 within the golf club head 100, and is allowed to fill the openings 172 after forming the discrete masses 176. To obtain a desired flushness with the striking face 144, in one example, the polymer material of the plug 179 originally protrudes from the striking face 144 and can be surface finished (e.g., sanded, ground, polished, chemically etched, etc.) until the plug 179 reaches the desired flushness.

[0340] The stiffener assembly 260 of the golf club head 100 of Figure 35 is similar to that of the golf club head 100 of Figures 31A and 32A except that a first wall 252, rather than a separate, dedicated wall, forms a front-most sidewall of a slot 170 formed in the sole portion 117 of the body 110. The slot 170 extends in a longitudinal direction parallel to the heel-toe direction. Although the slot 170 is shown as being closed to the interior cavity 113 of the body, in some examples the slot 170 may be open to the interior cavity 113 (see, e.g., Figure 40).

[0341] In one example, the slot 170 extends the entire length of the entire section of the face portion 142 adjacent the sole portion 117 of the body 110 (see, for example, FIG. 36). Thus, the first wall 252 also extends the entire length of the entire section of the face portion 142 adjacent the sole portion 117 of the body 110. However, the stiffener 254 extends in a length direction that is less than the entire length of the entire section of the face portion 142 adjacent the sole portion 117 of the body 110. In other words, the length L5 of the first wall 252 is much greater than the length L2 of the stiffener 254.

[0342] Although not shown, one or more of the stiffener assemblies 260 of the golf club head 100 of Figure 35 further includes a base 255 disposed between the stiffener 254 and the inner surface of the body 110, similar to the stiffener assemblies 260 of the golf club head 100 of Figures 31B and 32B. It will also be appreciated that in some instances, one or more of the stiffener assemblies 260 of the golf club head 100 of Figure 35 may include only one or none of the second wall 250 and the third wall 251.

[0343] 36 and 37, one implementation of the golf club head 100 of FIG. 35 is shown. In the golf club head 100 of FIG. 36 and 37, the second wall 250 is one wall 189 made of foam, the third wall 251 is the other wall 189 made of foam, and the stiffeners 254 are discrete masses 176 of polymeric material. The golf club head 100 of FIG. 36 and 37 also includes openings 172 formed in the face portion 142 through which the discrete masses 176 of polymeric material, respectively, are applied to form stiffener assemblies 260. Each opening 172 is plugged with a plug 179 after the polymeric material is applied.

[0344] Although not shown, in another implementation, the stiffener assembly 260 of the golf club head 100 of FIGS. 36 and 37 is configured similarly to the golf club head 100 of FIGS. 31B and 32B to have a base 187 made of foam between the discrete masses 176 of polymeric material and the inner surface of the body 110.

[0345] The stiffener assemblies 260 of the golf club heads 100 of FIGS. 31A, 31B, 32A, and 32B are shown offset from the center of the face portion 142 (e.g., center face). Thus, the stiffeners 254 of the golf club heads 100 of FIGS. 31A, 31B, 32A, and 32B are offset from the center of the face portion 142. In contrast, or in addition, in some examples, such as shown in FIG. 31C, at least one stiffener assembly 260 of the golf club head 100 is aligned with the center of the face portion 142 (i.e., disposed along the yz plane of the club head origin coordinate system 185) in order to offset the stiffener assemblies 260. In such examples, the stiffeners 254 of the corresponding stiffener assembly 260 are also aligned with the center of the face portion 142. When at least a portion of the stiffener 254 has an x-axis coordinate of zero in the golf club head origin coordinate system 185, the stiffener assembly 260 and stiffener 254 are considered to be aligned with the center of the face portion 142. In the illustrated example of FIG. 31C , although not in all examples, the golf club head 100 includes a stiffener assembly 260 at the bottom of the golf club head 100 aligned with the center of the face portion 142 and a stiffener assembly 260 at the top of the golf club head 100 aligned with the center of the face portion 142.

[0346] 38-43, according to another embodiment, the golf club head 100 includes a slot 400 and an insert 406 secured and retained within the slot 400. The slot 400 is similar to the slot 170 described above. For example, the slot 400 is formed in the sole portion 117 of the body 110 and extends generally vertically (e.g., longitudinally) in a heel-to-toe direction. More specifically, the slot 400 is parallel to and offset from the face portion 142. Along the length of the slot 400, the slot 400 is defined between a front wall 402 and a rear wall 404. The front wall 402 and the rear wall 404 extend substantially upright away from the sole portion 117 into the interior cavity 113 of the golf club head 100. The slot 400 is integrally molded with the body 110 and is made of the same material as the body 110. 40 and 41 , the slot 400, in some examples, opens into the interior cavity 113 of the body 110. More specifically, the slot 400 includes a first open end 422 and a second open end 424. The first open end 422 may be considered a bottom open end and the second open end 424 may be considered a top open end.

[0347] The insert 406 is formed separately from the formation of the body 110. The insert 406 is formed to complement the shape of the slot 400. More specifically, the insert 406 is configured to be press-fit into the slot 400 in some examples. As shown in FIGS. 40 and 41 , the insert 406 includes a base 406 that spans the width of the slot 400. When inserted into the slot 400, the base 406 covers or blocks the slot 400, preventing access to the interior cavity 113 through the slot 400. Extending from the base 406 are side walls, such as a front side wall 410 and a rear side wall 412. The insert 406 further includes a channel 408 defined between the front side wall 410 and the rear side wall 412. The channel 408 extends the entire length L1 of the insert 406, which is substantially the same length as the slot 400. The side walls of the slot 400 extend through the slot 400 and engage the sides of the slot to help retain the insert 406 within the slot 400. 41B, in some examples, an adhesive or bonding material 416 is disposed between the sidewalls of the insert 406 and the sides of the slot 400 to facilitate fixed retention of the insert 406 within the slot 400. In some examples, the insert 406 is selectively removable from the slot 400 without damaging the insert 406 or the slot 400. Thus, in such examples, the insert 406 can be reinserted into the slot 400 after removal.

[0348] The golf club head 100 of FIGS. 38-43 further includes at least one stiffener 414 secured and retained within the channel 408 of the insert 406. The stiffener 414 is directly bonded to the front wall 410 and the rear wall 412 of the insert 406. The stiffener 414 may be configured similarly to the stiffener 254 of FIGS. 31A and 32A. For example, the stiffener 414 may be made of a polymeric material having a hardness similar to that of the discrete masses 189 of polymeric material described above. In some examples, the stiffener 414 is selectively removable from the channel 408 such that the stiffener 414 may be inserted into and removed from the channel 408 without damaging the insert 406 or the stiffener 414. Thus, in one example, the stiffener 414 is press-fit into the channel 408. However, in other examples, the stiffener 414 is non-removably secured within the channel 408 of the insert 406, such as by an adhesive.

[0349] In some examples, the slot 400 is made of a first material having a first modulus of elasticity, the stiffener 414 is made of a second material having a second modulus of elasticity, and the insert 406 is made of a third material having a third modulus of elasticity. In these examples, the second modulus of elasticity is higher than the third modulus of elasticity and lower than the first modulus of elasticity. The ranges of values ​​for the first modulus of elasticity, the second modulus of elasticity, and the third modulus of elasticity can be the same as those listed above. According to one example, the slot 400 is made of a metal such as steel or titanium, the insert 406 is made of a plastic, and the stiffener 414 is made of an acrylic.

[0350] When the insert 406 having the stiffener 414 is inserted into the slot 400, the stiffener 414 affects the CT of the golf club head 100. Although the stiffener 414 does not directly contact the inner surface 145 of the face portion 142, the proximity of the stiffener 414 to the face portion 142 and the indirect coupling of the stiffener 414 to the face portion 142 via the front wall 402 of the slot 400 and the front side wall 410 of the insert 406 serves to stiffen the face portion 142, thus affecting (e.g., reducing) the CT of the golf club head 100.

[0351] To help improve the effect of the stiffener 414 on the CT of the golf club head 100, in some examples, the stiffener 414 is configured to be directly coupled to the front wall 402 and the rear wall 404 that define the slot 400, as shown in FIG. 41B. Directly coupling the stiffener 414 to the front wall 402 and the rear wall 404 reduces the distance D1 between the inner surface 145 and the stiffener 414, and effectively expands the stiffening effect of the stiffener 414 on the face portion 142 by more directly coupling the stiffener 414 to the face portion 142. The stiffener 414 is directly coupled to the front wall 410 and the rear wall 404 by passing a front extending tab 434 of the stiffener 414 through a front opening 430 formed in the front wall 410 of the insert 406 and a rear extending tab 436 of the stiffener 414 through a rear opening 432 formed in the rear wall 412 of the insert 406. The front extending tab 434 directly contacts the front wall 402 and the rear extending tab 436 directly contacts the rear wall 404. In this manner, the stiffener 414 is directly bonded to the front wall 402 and the rear wall 404.

[0352] 42, the length L2 of the stiffener 414 is less than the length L1 of the insert 406 and less than the full length of the channel 408. The stiffener 414 can be positioned along the channel 408 such that when the insert 406 is inserted into the slot 400, the stiffener 414 is toe-side, heel-side, or aligned with the center of the face portion 142. For example, the stiffener 414 can be positioned at any of the various positions of the stiffener 150 described above. The golf club head 100 can have two or more stiffeners 414 fixedly held within the channel 408 of the insert 406 as shown in FIG. 42. The stiffeners 414 are spaced apart along the length of the channel 408. The multiple stiffeners 414 can be configured similarly to one another. Alternatively, the multiple stiffeners 414 can be configured differently from one another, such as being made of materials with different elastic moduli, different hardness, different sizes, different shapes, etc. The different configurations can depend on the corresponding positions of the stiffeners 414. For example, the reinforcement 414 offset from the center of the face portion 142 toward the toe side may have a higher modulus of elasticity than the reinforcement 414 offset from the center of the face portion 142 toward the heel side.

[0353] 43, the insert 406 includes a single stiffener 414 having a length L2 substantially equal to the length L1 of the insert 406 and the length of the channel 408. In other words, the stiffener 414 can extend along the entire length of the channel 408.

[0354] 38-43 includes taking a first CT measurement on the face portion 142 of the golf club head 100 with the insert 406 and stiffener 414 retained within the slot 400. If the first CT measurement does not meet the intended target CT, the insert 406 with stiffener 414 is removed from the slot 400.

[0355] In one example, after removing the insert 406, the existing stiffeners 414 are removed and replaced with new stiffeners 414, such as made of a material with a higher modulus of elasticity or made of a material with the same modulus of elasticity but a larger size. The same insert 406 with the new stiffeners 414 is reinserted into the slot 400. Such an adjustment results in an adjustment (e.g., a reduction) to the CT of the golf club head at the same location on the face where the first CT measurement was taken. After reinserting the insert 406, another measurement can be taken to confirm the adjusted CT.

[0356] In another example, after removing the insert 406, a new insert 406 having stiffeners 414 configured differently than the stiffeners 414 of the removed insert 406 is inserted into the slot 400 in place of the removed insert 406. Such an adjustment results in an adjustment (e.g., a decrease) to the CT of the golf club head at the same location on the face where the first CT measurement was taken. After inserting the new insert 406, another measurement can be taken to confirm the adjusted CT.

[0357] 44 and 45, according to another example, the golf club head 100 includes a first wall 252 and a stiffener 254 disposed between the first wall 252 and the inner surface 145 of the face portion 142. The golf club head 100 also includes a slot 400 formed in the sole portion 117 of the body 110. The slot 400 generally extends longitudinally (e.g., longitudinally) in a heel-to-toe direction. More specifically, the slot 400 is parallel to the face portion 142. Along the length of the slot 400, the slot 400 is defined directly between the inner surface 145 of the front portion 142 and the retaining wall 252. Thus, the slot 400 of the golf club head 100 of FIGS. 44 and 45 is not offset rearwardly from the inner surface 145 as the slot 400 of the golf club head 100 of FIG. 40. Rather, the slots 400 of the golf club head 100 of Figures 44 and 45 are adjacent to the inner surface 145, which allows the stiffeners 254 to be in direct contact with the inner surface 154. The stiffeners 254 in direct contact with the inner surface 154 magnify the effect of the stiffeners 254 on the CT of the golf club head 100.

[0358] The first wall 252 of FIGS. 44 and 45 functions as a retaining wall that extends substantially upright into the internal cavity 113 of the golf club head 100, away from the sole portion 117, similar to the retaining wall 180 of FIGS. 33 and 34. However, the first wall 252 of the golf club head 100 of FIGS. 44 and 45 is inclined toward the face portion 142 at an obtuse angle θ1 defined between the first wall 252 and the inner surface of the sole portion 117 of the body 110. The first wall 252 is integrally molded with the body 110 in some implementations and is made of the same material as the body 110. The slot 400 opens into the internal cavity 113 of the body 110 in some examples. More specifically, the slot 400 includes a first open end 422 and a second open end 424. The first open end 422 can be considered a bottom open end and the second open end 424 can be considered a top open end.

[0359] The slot 400 of the golf club head 100 of FIG. 44 is directly defined by the inner surface 145 such that the stiffener 254 is sandwiched between the first wall 252 and the inner surface 145 of the face portion 142. In one example, the stiffener 254 is inserted into the slot 400 through the first open end 422. As the stiffener 254 is inserted, the slot 400 narrows and is defined upwardly by the angled first wall 252, causing a gradual increase in compression of the stiffener 254 between the inner surface 145 and the first wall 252. The compression of the stiffener 254 creates an interference fit of the stiffener 254 within the slot 400, which retains the stiffener 254 within the slot 400 during use of the golf club head 100. In some implementations, a retention-promoting feature, such as an adhesive, can be added to promote retention of the stiffener 254 within the slot 400. Alternatively or additionally, in certain implementations, the reinforcement 254 may be inserted into the slot 400 in an expandable state (pre-cured state) such that after insertion into the slot 400, the reinforcement 245 expands within the slot 400 to facilitate retention of the reinforcement 254 within the slot 400.

[0360] The reinforcement 254 of the golf club head of FIGS. 44 and 45 is made of a second material having a second elastic modulus. The second elastic modulus is less than the first elastic modulus of the material of the first wall 252 and the face portion 142. In some examples, the second elastic modulus is between 0.5 GPa and 30.0 GPa. According to other examples, the second elastic modulus is between 1.0 GPa and 5.0 GPa. Referring to FIG. 45, the length of the reinforcement 254 is less than the full length of the slot 400. The reinforcement 254 can be positioned along the slot 400 such that when the reinforcement 254 is inserted into the slot 400, the reinforcement 254 is in the toe direction, in the heel direction, or aligned with the center of the face portion 142. For example, the reinforcement 254 can be positioned in any of the various locations of the reinforcement 150 described above. 45, the golf club head 100 may have two or more stiffeners 254 fixedly held within the slot 400. The stiffeners 254 are spaced apart along the length of the channel 400. The stiffeners 254 may be configured similarly to one another. Alternatively, the stiffeners 254 may be configured differently from one another, such as by being made of materials with different elastic moduli, different hardness, different sizes, different shapes, etc. The different configurations may depend on the corresponding locations of the stiffeners 254. For example, a stiffener 254 offset toe-wise from the center of the face portion 142 may have a higher elastic modulus than a stiffener 254 aligned with the center of the face portion 142.

[0361] According to one example, the method of adjusting the CT of the golf club head 100 of Figures 44 and 45 includes taking a first CT measurement on the face portion 142 of the golf club head 100 having the stiffeners 254 retained in the slots 400. If the first CT measurement does not meet the CT for the intended purpose, the stiffeners 254 are removed from the slots 400.

[0362] In one example, the removed stiffener 254 is replaced with a new stiffener 254, such as one made of a material with a higher elastic modulus, higher hardness, or made of a material with the same elastic modulus but a larger size. In other words, the new stiffener 414 is inserted into the slot 400 in place of the removed stiffener 254. Such an adjustment results in an adjustment (e.g., a reduction) to the CT of the golf club head at the same location on the face where the first CT measurement was taken. The adjusted CT can be confirmed by taking another measurement after the new stiffener 254 is inserted. According to another example, the original stiffener 254 is moved to a new location along the slot 400 to adjust the CT to match the CT of the intended purpose.

[0363] Although not specifically shown, the golf club head 100 of the present disclosure may include other features to enhance performance characteristics of the golf club head 100. For example, the golf club head 100, in some implementations, may incorporate any of the features and configurations described in U.S. Patent Nos. 6,773,360; 7,166,040; 7,452,285; 7,628,707; 7,186,190; 7,591,738; 7,963,861; 7,621,823; 7,448,963; 7,568,985; 7,578,753; 7,717,804; 7,717,805; 7, and 7,410,426, the entire contents of each of which are incorporated herein by reference in their entirety.

[0364] In certain implementations, for example, the golf club head 100 may be configured to include a golf club head that is adapted to fit a golf club head according to U.S. Patent Nos. 7,775,905 and 8,444,505; U.S. Patent Application No. 13 / 898,313, filed May 20, 2013; U.S. Patent Application No. 14 / 047,880, filed October 7, 2013; U.S. Patent Application No. 61 / 702,667, filed September 18, 2012; U.S. Patent Application No. 13 / 841,325, filed March 15, 2013; and slidable weight mechanisms similar to those described in more detail in U.S. patent application Ser. No. 13 / 946,918, filed July 19, 2013; U.S. patent application Ser. No. 14 / 789,838, filed July 1, 2015; U.S. patent application Ser. No. 62 / 020,972, filed July 3, 2014; U.S. patent application Ser. No. 62 / 065,552, filed October 17, 2014; and U.S. patent application Ser. No. 62 / 141,160, filed March 31, 2015, the entire contents of each of which are incorporated herein by reference in their entirety.

[0365] According to some implementations, the golf club head 100 includes aerodynamic shape features similar to those described in more detail in U.S. Patent Application Publication No. 2013 / 0123040A1, the entire contents of which are incorporated herein by reference.

[0366] In certain implementations, the golf club head 100 includes a removable shaft mechanism similar to that described in more detail in U.S. Pat. No. 8,303,431, the contents of which are incorporated herein by reference in their entirety.

[0367] Further, according to some implementations, the golf club head 100 includes an adjustable loft / lie mechanism similar to those described in more detail in U.S. Patent No. 8,025,587; U.S. Patent No. 8,235,831; U.S. Patent No. 8,337,319; U.S. Patent Application Publication No. 2011 / 0312437 A1; U.S. Patent Application Publication No. 2012 / 0258818 A1; U.S. Patent Application Publication No. 2012 / 0122601 A1; U.S. Patent Application Publication No. 2012 / 0071264 A1; and U.S. Patent Application No. 13 / 686,677, the entire contents of which are incorporated herein by reference in their entireties.

[0368] Additionally, in some implementations, the golf club head 100 includes an adjustable sole mechanism similar to that described in more detail in U.S. Pat. No. 8,337,319; U.S. Patent Application Publication Nos. 2011 / 0152000 A1, 2011 / 0312437, 2012 / 0122601 A1; and U.S. Patent Application No. 13 / 686,677, the entire contents of each of which are incorporated herein by reference in their entirety.

[0369] In some implementations, the golf club head 100 includes a composite face feature similar to those described in further detail in patent application Ser. Nos. 11 / 998,435; 11 / 642,310; 11 / 825,138; 11 / 823,638; 12 / 004,386; 12 / 004,387; 11 / 960,609; 11 / 960,610; and U.S. Patent No. 7,267,620, the entireties of which are incorporated herein by reference.

[0370] In some examples, the golf club head includes a plurality of stiffeners disposed within the internal cavity of the body and offset from the inner surface of the face portion by at least 1 mm and no more than 20 mm as measured along a head origin y-axis. The plurality of stiffeners are elongated stiffening members extending between the inner surface of the crown portion and the inner surface of the sole portion. For example, the plurality of stiffeners are the same as or similar to the stiffening members shown and described in U.S. Patent Application No. 14 / 855,190, filed September 15, 2015, the brace bar shown and described in U.S. Patent Application No. 15 / 859,297, filed December 29, 2017, and the stiffening tube shown and described in U.S. Patent No. 9,795,840, issued October 24, 2017, all of which are incorporated herein by reference in their entirety.

[0371] The features of the golf club head described herein, including the ability to adjust the CT after manufacturing of the golf club head is complete, facilitate higher CT values ​​over a larger surface area of ​​the striking face, particularly in the central region, than conventional golf club heads. For example, graphs 500 and 510 in FIGS. 47 and 48 show relatively higher CT values ​​in the central region of the striking face of two different implementations of the golf club head described herein compared to conventional golf club heads. The central region of the striking face is defined by a rectangular area of ​​40 millimeters by 20 millimeters centered on the center of the striking face and elongated in a heel-toe direction. As shown in graphs 500 and 510, in the central region, the striking face of the golf club head described herein has a characteristic time (CT) of 257 microseconds or less. Furthermore, in the central region of at least one example of the golf club head described herein, such as that illustrated by graphs 500 and 510, more than 60% of the striking face has a CT of at least 235 microseconds. Further, within the central region of at least one example golf club head described herein, such as those illustrated by graphs 500 and 510, 35%, 60%, or 70% or more of the striking faces have a CT of at least 240 microseconds. Further, within the central region of at least one example golf club head described herein, such as those illustrated by graphs 500 and 510, 40% or 50% or more of the striking faces have a CT of at least 245 microseconds. Further, within the central region of at least one example golf club head described herein, such as those illustrated by graphs 500 and 510, 10% or more of the striking faces have a CT of at least 250 microseconds.

[0372] Further, in at least one example of a golf club head described herein, such as those illustrated by graphs 500 and 510, more than 20% of the striking face has a CT of at least 245 microseconds. Further, in at least one example of a golf club head described herein, such as those illustrated by graphs 500 and 510, the CT at any location on the striking face within at least 5 millimeters from the center of the striking face is greater than 240 microseconds. Referring to graph 520 of FIG. 49, in at least one example of a golf club head described herein, the CT of the striking face peaks at a distance of at least 30 millimeters in a toe direction from the center of the striking face along a horizontal path on the striking face that passes through the center of the striking face.

[0373] In accordance with at least one embodiment of the golf club head described herein, at least 25% of the striking face in the central region has a coefficient of restitution (COR) of at least 0.8. In at least one embodiment, at least 50% of the striking face in the central region has a coefficient of restitution (COR) of at least 0.8. In yet another embodiment, at least 55% of the striking face in the central region has a coefficient of restitution (COR) of at least 0.8.

[0374] In one embodiment, a method of manufacturing a golf club head, such as golf club head 100, includes one or more of the following steps: (1) forming a frame having a sole opening, injection molding a thermoplastic composite head component over the sole insert to form a sole insert unit, and bonding the sole insert unit to the frame; (2) providing a composite head component that is a weight track capable of supporting one or more slidable weights; (3) forming a sole insert from a thermoplastic composite material having a matrix suitable for bonding with the weight track; (4) forming a sole insert from a continuous fiber composite material having continuous fibers selected from the group consisting of glass fiber, aramid fiber, carbon fiber, and any combination thereof, and having a thermoplastic matrix consisting of polyphenylene sulfide (PPS), polyamide, polypropylene, thermoplastic polyurethane, thermoplastic polyurea, polyamide-amide (PAI), polyetheramide (PEI), polyetheretherketone (PEEK), and any combination thereof; (5) forming a sole insert and a composite head component from a thermoplastic composite material having a compatible matrix. (6) forming a sole insert from a thermosetting material, coating the sole insert with a heat activated adhesive, and forming a weight track from an injectable thermoplastic material on the sole insert after the coating process; (7) forming a frame from a material selected from the group consisting of titanium, one or more titanium alloys, aluminum, one or more aluminum alloys, steel, one or more steel alloys, and any combination thereof; (8) forming a frame having a crown opening, forming a crown insert from a composite laminate material, and bonding the crown insert to the frame such that the crown insert covers the crown opening; (9) selecting a composite head component from the group consisting of one or more ribs for strengthening the golf club head, ribs for adjusting one or more acoustic characteristics of the golf club head, one or more weight ports for receiving weights secured to the sole portion of the golf club head, one or more weight tracks for receiving slidable weights, and combinations thereof;(10) forming a sole insert and a crown insert from a continuous carbon fiber composite material; (11) forming a sole insert and a crown insert by heat curing with a material suitable for heat curing and coating the sole insert with a heat activated adhesive; (12) forming a frame from titanium, a titanium alloy or a combination thereof to have a crown opening, a sole insert, and a weight track from a thermoplastic carbon fiber material having a matrix selected from the group consisting of polyphenylene sulfide (PPS), polyamide, polypropylene, thermoplastic polyurethane, thermoplastic polyurea, polyamide-amide (PAI), polyetheramide (PEI), polyetheretherketone (PEEK), and any combination thereof; and (13) forming a frame with a crown opening, forming a crown insert from a thermoplastic composite material, and bonding the crown insert to the frame such that the crown insert covers the crown opening.

[0375] Exemplary polymers for the embodiments described herein include synthetic and natural rubbers, thermoset polymers such as thermoset polyurethanes or thermoset polyureas, and thermoplastic polyurethanes; thermoplastic polyureas; metallocene-catalyzed polymers; unimodal ethylene / carboxylic acid copolymers; unimodal ethylene / carboxylic acid / carboxylic acid terpolymers; bimodal ethylene / carboxylic acid copolymers; bimodal ethylene / carboxylic acid / carboxylic acid terpolymers; polyamides (PA); polyketones (PK); copolymer amides; polyesters; copolyesters; polycarbonates; polyphenylene sulfide (PPS); cyclic olefin copolymers (COC); polyolefins; halogenated polyolefins [e.g., chlorinated polyethylene (CPE)]; halogenated polyalkylene compounds; polyalkenamers; polyphenylene oxides; polyphenylene sulfides; diallyl phthalate polymers; polyimides; polyvinyl chloride; polyamide-ionomers; polyurethane ionomers; polyvinyl alcohols; polyarylates; polyacrylates. styrene-butadiene-styrene copolymers;styrene-acrylonitrile (SAN);acrylonitrile-styrene-acrylonitrile;styrene-maleic anhydride (S / MA) polymers, styrene-butadiene-styrene (SBS);styrene-ethylene-butylene-styrene;styrenic block copolymers including (SEBS) and styrene-ethylene-propylene-styrene (SEPS);styrenic terpolymers;functionalized styrenic block copolymers including hydroxylated, functionalized styrenic copolymers, and terpolymers;cellulosic polymers;liquid crystal polymers (LCP);ethylene-propylene-diene terpolymer (EPDM);ethylene-vinyl acetate copolymer (EVA);ethylene-propylene copolymers;propylene elastomers (such as those described in U.S. Pat. No. 6,525,157 to Kim et al., the entire contents of which are incorporated herein by reference);ethylene vinyl acetate;polyureas;and thermoplastic polymers, including thermoplastic elastomers such as polysiloxanes, and any and all combinations thereof;

[0376] Of these, polyamides (PA), polyphthalimides (PPA), polyketones (PK), copolymeramides, polyesters, copolyesters, polycarbonates, polyphenylene sulfides (PPS), cyclic olefin copolymers (COC), polyphenylene oxides, diallyl phthalate polymers, polyarylates, polyacrylates, polyphenylene ethers, and impact-modified polyphenylene ethers are preferred. Particularly preferred polymers for use in the golf club head of the present invention are the family of so-called high-performance engineering thermoplastics, known for their toughness and stability at high temperatures. These polymers include polysulfones, polyether amides, and polyamide-imides. Of these, the most preferred are polysulfones.

[0377] Aromatic polysulfones are a family of polymers made from the condensation polymerization of 4,4'-dichlorodiphenyl sulfone with itself or with one or more dihydric phenols. Aromatic polysulfones include thermoplastics also called polyethersulfones, whose general structure of repeating units has a diarylsulfone structure that can be represented as -arylene-SO2-arylene-. These units may be linked to each other through carbon-carbon bonds, carbon-oxygen-carbon bonds, carbon-sulfur-carbon bonds, or short alkylene bonds to form thermally stable thermoplastic polymers. Polymers of this family are completely amorphous, exhibit high glass transition temperatures, and provide high strength and stiffness properties even at high temperatures, making them useful for demanding engineering applications. The polymers also have good ductility and toughness, and are transparent in their native state due to their completely amorphous nature. Other important properties include resistance to hydrolysis by hot water / steam, and excellent resistance to acids and bases. Polysulfones are completely thermoplastic, allowing for manufacture by most standard methods such as injection molding, extrusion, and thermoforming. They also enjoy a wide range of high temperature engineering applications.

[0378] The three commercially important polysulfones are a) polysulfone (PSU); b) polyethersulfone (PES also called PESU); and c) polyphenylene sulfonate (PPSU).

[0379] Particularly important and preferred aromatic polysulfones are those consisting of repeating units of the structure -C6H4SO2-C6H4-O-, where C6H4 represents an m- or p-phenylene structure. The polymer chains may also contain repeating units such as -C6H4-, C6H4-O-, -C6H4-(lower alkylene)-C6H4-O-, -C6H4-O-C6H4-O-, -C6H4-S-C6H4-O-, and other thermally stable substantially aromatic difunctional groups known in the art of engineering thermoplastics. Each aromatic ring may have:

[0380] [ka] Also included are so-called modified polysulfones, which are further substituted with one or more substituents including:

[0381] In the formula, R is independently a hydrogen atom, a halogen atom, a hydrocarbon group, or a combination thereof. Halogen atoms include fluorine, chlorine, bromine, and iodine atoms. Hydrocarbon groups include, for example, C1-C20 alkyl groups, C2-C20 alkenyl groups, C3-C20 cycloalkyl groups, C3-C20 cycloalkenyl groups, and C6-C20 aromatic hydrocarbon groups. These hydrocarbon groups may be partially substituted with halogen atoms, or may be partially substituted with polar groups other than halogen atoms. Specific examples of C1-C20 alkyl groups include the above-mentioned methyl group, ethyl group, propyl group, isopropyl group, amyl group, hexyl group, octyl group, decyl group, and dodecyl group. Specific examples of C2-C20 alkenyl groups include the above-mentioned propenyl group, isopropenyl group, butenyl group, isobutenyl group, pentenyl group, and hexenyl group. Specific examples of C3-C20 cycloalkyl groups include the above-mentioned cyclopentyl group and cyclohexyl group. Specific examples of C3-C20 cycloalkenyl groups include the above-mentioned cyclopentenyl group and cyclohexenyl group. Specific examples of aromatic hydrocarbon groups include the above-mentioned phenyl group and naphthyl group, or a combination thereof.

[0382] A particular preferred polymer is (a) prepared by the condensation polymerization of bisphenol A and 4,4'-dichlorodiphenyl sulfone in the presence of a base, and has the main repeating structure

[0383] [ka] and the abbreviation PSF, sold under the trade names Udel®, Ultrason® S, Eviva®, and RTP PSU; (b) a polysulfone prepared by the condensation polymerization of 4,4'-dihydroxydiphenyl and 4,4'-dichlorodiphenyl sulfone in the presence of a base, having the main repeating unit

[0384] [ka] and (c) a polysulfone having the abbreviation PPSF and sold under the trade name RADEL® resin; and (d) a polysulfone prepared from 4,4'-dichlorodiphenyl sulfone in the presence of a base and having the main repeating structure

[0385] [ka] and the abbreviation PPSF, and sometimes referred to as "polyethersulfone", including condensation polymers sold under the trade names Ultrason® E, LNP®, Veradel® PESU, Sumikaexce, and VICTREX® resins, and any and all combinations thereof.

[0386] In some embodiments, composite materials, such as carbon composite materials, made of composite materials that include multiple layers or layers of fibrous material (e.g., graphite, or carbon fibers including turbolaminated or graphitic carbon fibers, or hybrid structures in which both graphitic and turbolaminated portions are present). Examples of some of these composite materials and their manufacturing procedures for use in metal wood golf clubs are described in U.S. Patent Application Nos. 10 / 442,348 (now U.S. Patent No. 7,267,620), 10 / 831,496 (now U.S. Patent No. 7,140,974), 11 / 642,310, 11 / 825,138, 11 / 998,436, 11 / 895,195, 11 / 823,638, 12 / 004,386, 12,004,387, 11 / 960,609, 11 / 960,610, and 12 / 156,947, which are incorporated herein by reference in their entireties. The composite materials can be manufactured according to the methods described in U.S. Patent Application No. 11 / 825,138, the entire contents of which are incorporated herein by reference.

[0387] Alternatively, short or long fiber reinforced compounds as mentioned above can be used. An exemplary compound includes a nylon 6 / 6 polyamide compound, filled with 30% carbon fiber, available from RTP Company under the trade name RTP285. This material has a tensile strength of 35,000 psi (241 MPa) as measured by ASTM D 638; a tensile elongation of 2.0-3.0% as measured by ASTM D 638; a tensile modulus of 3.30x106 psi (22754 MPa) as measured by ASTM D 638; a flexural strength of 50,000 psi (345 MPa) as measured by ASTM D 790; and a flexural modulus of 2.60x106 psi (17927 MPa) as measured by ASTM D 790.

[0388] Other materials also include a polyphthalamide (PPA) compound filled with 40% carbon fiber and commercially available from RTP Company under the tradename RTP4087UP, which has a tensile strength of 360 MPa as measured by ISO 527, a tensile elongation of 1.4% as measured by ISO 527, a tensile modulus of 41,500 MPa as measured by ISO 527, a flexural strength of 580 MPa as measured by ISO 178, and a flexural modulus of 34,500 MPa as measured by ISO 178.

[0389] Yet another material includes a polyphenylene sulfide (PPS) compound filled with 30% carbon fiber and commercially available from RTP Company under the tradename RTP1385UP, which has a tensile strength of 255 MPa as measured by ISO 527; a tensile elongation of 1.3% as measured by ISO 527; a tensile modulus of 28,500 MPa as measured by ISO 527; a flexural strength of 385 MPa as measured by ISO 178; and a flexural modulus of 23,000 MPa as measured by ISO 178.

[0390] A particularly preferred material includes a polysulfone (PSU) compound filled with 20% carbon fiber and commercially available from RTP Company under the trade name RTP 983. This material has a tensile strength of 124 MPa as measured by ISO 527; a tensile elongation of 2% as measured by ISO 527; a tensile modulus of 11,032 MPa as measured by ISO 527; a flexural strength of 186 MPa as measured by ISO 178; and a flexural modulus of 9,653 MPa as measured by ISO 178.

[0391] A preferred material may also include a polysulfone (PSU) compound filled with 30% carbon fiber and commercially available from RTP Company under the trade name RTP 985. This material has a tensile strength of 138 MPa as measured by ISO 527; a tensile elongation of 1.2% as measured by ISO 527; a tensile modulus of 20,685 MPa as measured by ISO 527; a flexural strength of 193 MPa as measured by ISO 178; and a flexural modulus of 12,411 MPa as measured by ISO 178.

[0392] A more preferred material includes a polysulfone (PSU) compound filled with 40% carbon fiber and commercially available from RTP Company under the trade name RTP 987. This material has a tensile strength of 155 MPa as measured by ISO 527; a tensile elongation of 1% as measured by ISO 527; a tensile modulus of 24,132 MPa as measured by ISO 527; a flexural strength of 241 MPa as measured by ISO 178; and a flexural modulus of 19,306 MPa as measured by ISO 178.

[0393] Throughout this specification, the use of "one embodiment," "an embodiment," or similar language means that a particular feature, structure, or characteristic described with respect to that embodiment is included in at least one embodiment of the present disclosure. Throughout this specification, the appearances of "in one embodiment," "in an embodiment," and similar phrases may, but do not necessarily, all refer to the same embodiment. Similarly, use of the term "implementation" refers to an implementation having a particular feature, structure, or characteristic described in connection with one or more embodiments of the present disclosure, but an implementation may be associated with one or more embodiments in the absence of an explicit correlation indicating otherwise.

[0394] In the above description, certain terms may be used, such as "top", "bottom", "upper", "lower", "horizontal", "vertical", "left", "right", "upper", "lower", etc. When applicable, these terms are used for clarity of description when dealing with relative relationships. However, these terms are not intended to imply absolute relationships, positions, and / or orientations. For example, with respect to an object, a "top" surface can become a "lower" surface by simply turning the object. Nevertheless, it is still of the same purpose. Furthermore, the terms "contain", "include", "have", and variations thereof mean "including but not limited to" unless otherwise expressly stated. A list of enumerated items does not imply that some or all of the items are mutually exclusive and / or mutually inclusive, unless otherwise expressly specified. The terms "a", "an", and "the" also refer to "one or more", unless otherwise expressly specified. Furthermore, the term "plurality" may be defined as "at least two". The term "about" in some embodiments may be defined to mean within + / - 5% of a given value.

[0395] Additionally, examples herein of an element being "coupled" to another element may include direct and indirect coupling. A direct coupling may be defined as an element being coupled to another element and in contact with the other element. An indirect coupling may be defined as a coupling between two elements that are not in direct contact with each other, but have one or more additional elements between the coupled elements. Additionally, as used herein, fixing an element to another element may include direct fixing and indirect fixing. Additionally, as used herein, "adjacent" does not necessarily mean in contact. For example, an element may be adjacent to another element without being in contact with the element.

[0396] As used herein, the phrase "at least one of," when used in conjunction with a list of items, means that different combinations of one or more of the listed items can be used. An item is a particular object, thing, or category. In other words, "at least one of" means that any combination or number of items can be used from the list, but not all of the items in the list are required. For example, "at least one of item A, item B, and item C" can mean item A; item A and item B; item B; item A, item B, and item C; or item B and item C. In some cases, "at least one of item A, item B, and item C" can mean, for example, but not limited to, two of item A, one of item B, and ten of item C; four of item B and seven of item C, or other suitable combinations.

[0397] Unless otherwise indicated, the terms "first," "second," and the like are used herein merely as labels and are not intended to impose any order, position, or hierarchy requirements on the items to which they refer. Moreover, a reference to, for example, a "second" item does not require or preclude the presence of, for example, a "first" or lower-numbered item, and / or, for example, a "third" or higher-numbered item.

[0398] As used herein, a system, device, structure, article, element, component, or hardware that is "configured" to perform a particular function is capable of performing the particular function without modification, rather than merely having the potential to perform the particular function after further modification. In other words, a system, device, structure, article, element, component, or hardware that is configured to perform a particular function is specifically selected, made, implemented, utilized, programmed, and / or designed for the purpose of performing the particular function. As used herein, "configured" refers to a system, device, structure, article, element, component, or hardware that exhibits existing characteristics that enable the system, device, structure, article, element, component, or hardware to perform a particular function without further modification. For purposes of this disclosure, a system, device, structure, article, element, component, or hardware that is described as "performing" a particular function may additionally or alternatively be described as "adapted" and / or "operable" to perform that function.

[0399] The subject matter may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope. The invention as originally claimed in the present application is set forth below. [1] Defines an internal cavity; a sole portion disposed in a bottom region of the golf club head, the sole portion having a sole surface region; a crown portion disposed at a top region of the golf club head, the crown portion having a crown surface area; a skirt portion disposed around the golf club head between the sole portion and the crown portion; anterior area; a posterior region opposite said anterior region; Heel area; and a body including a toe region opposite said heel region; a golf club head coupled to the body at the forward region of the body and comprising a face portion including a striking face and an interior surface opposite the striking face, wherein: the face portion having a different thickness; The crown portion of the golf club head has an areal weight of about 0.35 g / cm over about 50% or more of the total surface area of ​​the crown portion. 2 Less than; The area weight of the sole portion of the golf club head is about 0.35 g / cm over about 50% or more of the total surface area of ​​the sole portion. 2 Less than; the striking face having a central region defined by a 40 millimeter by 20 millimeter rectangular region centered about the center of the striking face and elongated in a heel-toe direction; Within the central region, the maximum thickness of the face portion is 5 mm or less and the minimum thickness of the face portion is 2.4 mm or more; Within the central region, the striking face has a characteristic time (CT) of 257 microseconds or less; Within the central region, 25% or more of the striking face has a coefficient of restitution (COR) of at least 0.8; Within the central region, 60% or more of the striking face has a CT of at least 235 microseconds; and Within the central region, greater than 50% of the striking face has a CT of at least 240 microseconds. [2] [1] A golf club head, wherein at least 20% of the striking face has a CT of at least 245 microseconds. [3] [1] The golf club head of claim 1, wherein at least 60% of the striking face within the central region has a CT of at least 240 microseconds. [4] [1] The golf club head of claim 1, wherein at least 40% of the striking face within the central region has a CT of at least 245 microseconds. [5] [1] The golf club head of claim 1, wherein at least 10% of the striking face within the central region has a CT of at least 250 microseconds. [6] A golf club head, wherein the CT at any location on the striking face within at least 5 millimeters of the center of the striking face is greater than 240 microseconds. [7] The golf club head of [1] has a center of gravity (CG) having a head center face origin x-axis coordinate of about -5 mm to about 5 mm, a head center face origin y-axis coordinate of about 25 mm to about 50 mm, and a center face head origin z-axis coordinate of less than 2 mm. [8] The golf club head is approximately 350 cm 3 ~about 500cm 3 A golf club head having a volume of [1], a moment of inertia (Izz) about the z-axis of the head's center of gravity, and a moment of inertia (Ixx) about the x-axis of the head's center of gravity. [9] The total of Izz and Ixx is approximately 740kg mm 2 ~1100kg・mm 2 [8] A golf club head.

[10] The golf club head according to [1] further includes a reinforcing member disposed within the internal cavity of the body and in direct contact with the inner surface of the face portion, the reinforcing member being made of a material having a hardness of at least Shore 5.95D.

[11] The golf club head of claim 1, further comprising a plurality of reinforcements disposed within the internal cavity of the body and in direct contact with the inner surface of the face portion, the plurality of reinforcements being a plurality of ribs made of the same material as the body.

[12] The golf club head according to claim 11, wherein the plurality of ribs are disposed adjacent to a transition portion between the face portion and the crown portion.

[13] At least one of the plurality of ribs has a head origin x-axis coordinate of +15 mm to +25 mm, and at least one of the plurality of ribs has a head origin x-axis coordinate of -15 mm to -25 mm.

[14] a plurality of reinforcing members disposed within the internal cavity of the body and offset from an inner surface of the face portion by at least 1 mm and not more than 20 mm when measured along a head origin y-axis, the plurality of reinforcing members being elongated reinforcing members extending between the inner surface of the crown portion and the inner surface of the sole portion [1].

[15] the plurality of stiffeners includes two or more brace bars; and The golf club head according to

[14] , wherein the two or more brace bars each have a mass per unit length of 0.005 g / mm to 0.40 g / mm.

[16] At least one of the plurality of reinforcements has a head origin x-axis coordinate of +15 mm to +25 mm, and at least one of the plurality of reinforcements has a head origin x-axis coordinate of -15 mm to -25 mm.

[17] A golf club head according to [1], wherein the maximum thickness of the face portion is 4 mm or less.

[18] A golf club head according to [1], wherein the minimum thickness of the face portion is less than 3 mm.

[19] The golf club head according to claim 1, wherein the body and the face portion are integrally formed into a single monolithic structure.

[20] The face portion of the golf club head according to [1] has a face opening and a striking plate welded to the face opening.

[21] a first wall extending upright from the sole portion and extending longitudinally in a heel-toe direction and made of a first material having a first modulus of elasticity between 15 GPa and 350 GPa; and 1. A golf club head according to claim 1, further comprising a reinforcing member disposed within the internal cavity of the body and between the inner surface of the face portion and the first wall, the reinforcing member being made of a second material having a second elastic modulus less than the first elastic modulus, the second elastic modulus being between 0.5 GPa and 30 GPa, the second material having a hardness of at least Shore 5.95D, and the reinforcing member being in direct contact with the inner surface of the face portion.

[22] The golf club head further includes a second wall extending upright from the sole portion, extending longitudinally generally in a front-to-rear direction, the second wall being made of a third material having a third modulus of elasticity less than the first modulus of elasticity; the second modulus of elasticity being greater than the third modulus of elasticity; the reinforcement abuts the second wall; The golf club head further includes a third wall extending upright from the sole portion, extending generally longitudinally in a fore-aft direction, spaced apart from the second wall in a direction parallel to the heel-toe direction and made of the third material; The golf club head according to

[21] , wherein the reinforcement member abuts the third wall and is disposed between the second wall and the third wall.

[23] the first material being one of titanium or steel; the second material is a foam;

[22] A golf club head according to claim 1, wherein the third material is acrylic.

Claims

1. Defines an internal cavity; a sole portion disposed in a bottom region of the golf club head, the sole portion having a sole surface region; a crown portion disposed at a top region of the golf club head, the crown portion having a crown surface area; Anterior area; a posterior region opposite said anterior region; Heel area; and a toe region opposite said heel region; A body including: a face portion coupled to the body at the forward region of the body and including a striking face and an inner surface opposite the striking face; The golf club head comprising: a weight port disposed in the rear region of the golf club head below a crown portion of the golf club head, the weight port configured to receive a weight; and and a crown insert configured to receive an opening having a periphery at the top region, the crown portion of the golf club head having an areal weight of about 0.35 g / cm over at least about 50% of a total surface area of ​​the crown portion. ２ less than about 1 g / cm 3 and said crown insert is formed of a non-metallic material having a density between about 1 g / cm 3 and about 2 g / cm 3 ; The golf club head has a center of gravity (CG) with an x-axis coordinate on an x-axis of a coordinate system centered at the geometric center of the striking face between about -5 mm and about 5 mm, a y-axis coordinate on a y-axis of a coordinate system centered at the geometric center of the striking face between about 25 mm and about 50 mm, and a z-axis coordinate on a z-axis of a coordinate system centered at the geometric center of the striking face less than 2 mm, the x-axis being parallel to the ground when the golf club head is in an address position on the ground, the x-axis extending in a heel-to-toe direction, with negative values ​​of the x-axis being toward the heel of the geometric center of the striking face and positive values ​​of the x-axis being less than 0.05 mm. a toe direction of the geometric center of the striking face, the y-axis being parallel to the ground when the golf club head is in an address position on the ground, the y-axis extending in a front-to-back direction, negative values ​​of the y-axis being behind the geometric center of the striking face and positive values ​​of the y-axis being in front of the geometric center of the striking face, and the z-axis being perpendicular to the ground when the golf club head is in an address position on the ground, the z-axis extending in a bottom-to-top direction, negative values ​​of the z-axis being below the geometric center of the striking face and positive values ​​of the z-axis being above the geometric center of the striking face; the striking face having a central region defined by a 40 millimeter by 20 millimeter rectangular region centered about the geometric center of the striking face and elongated in a heel-toe direction; the face portion having a different thickness; the face portion further comprises a face opening and a striking plate covering the face opening, the striking plate being adhered or bonded to the face opening; within the central region, the striking face has a characteristic time (CT) of 257 microseconds or less; Within the central region, 25% or more of the striking face has a coefficient of restitution (COR) of at least 0.8; Within the central region, 60% or more of the striking face has a CT of at least 235 microseconds; Within the central region, 35% or more of the striking face has a CT of at least 240 microseconds; a CT at the center of the striking face is greater than or equal to 240 microseconds (excluding greater than or equal to 254 microseconds); there is at least one point on the striking face within 10 mm of the striking face center where the CT is higher than the CT of the striking face center; the golf club head has a volume between about 350 cm3 and about 500 cm3, a moment of inertia (Izz) about a head center of gravity z-axis, and a moment of inertia (Ixx) about a head center of gravity x-axis, the head center of gravity z-axis being an axis passing through the center of gravity and parallel to the z-axis of a coordinate system centered at the geometric center of the striking face, and the head center of gravity x-axis being an axis passing through the center of gravity and parallel to the x-axis of a coordinate system centered at the geometric center of the striking face; The sum of Izz and Ixx is between about 790 kg·mm 2 and about 1100 kg·mm 2 ; and The ratio of Ixx / Izz is at least 0.55 and Ixx is greater than or equal to 305 kg·mm 2 .

2. A golf club head as described in claim 1, wherein the crown insert is made of a fiber reinforced polymer material.

3. The golf club head of claim 2, wherein the area weight of the sole portion of the golf club head is less than about 0.35 g / cm 2 over at least about 50% of a total surface area of ​​the sole portion.

4. A hosel extending from the heel region of the golf club head; and an adjustable lie / loft assembly coupled to the hosel; 4. The golf club head of claim 3, wherein the adjustable lie / loft assembly is configured to be coupled to a shaft and configured to allow adjustment to change the angle of the shaft relative to the golf club head when coupled to the adjustable lie / loft assembly.

5. The golf club head of claim 4, comprising a frame, the frame comprising the face opening and the top region opening.

6. The golf club head of claim 5, wherein the frame comprises one or more aluminum alloys.

7. The golf club head of claim 6, wherein the frame comprises one or more aluminum alloys or one or more steel alloys.

8. The golf club head of claim 4, wherein at least a portion of the body is a titanium alloy containing molybdenum, vanadium, and aluminum, the titanium alloy having a tensile strength of at least 958 MPa.

9. The golf club head of claim 4, wherein the CT at any location on the striking face within 5 millimeters of the center of the striking face is greater than 240 microseconds.

10. The golf club head of claim 9, wherein at least 20% of the striking face within the central region has a CT of at least 245 microseconds.

11. The golf club head of claim 9, wherein at least 60% of the striking face within the central region has a CT of at least 240 microseconds.

12. The golf club head of claim 4, wherein within the central region, the maximum thickness of the striking plate is less than or equal to about 4 mm, the minimum thickness of the striking plate is greater than or equal to about 2.4 mm, and the CT at any location on the striking face within 5 mm from the center of the striking face is greater than 240 microseconds.

13. The golf club head of claim 12, wherein within the central region, 20% or more of the striking face has a CT of at least 245 microseconds.

14. The golf club head of claim 13, wherein within the central region, at least 60% of the striking face has a CT of at least 240 microseconds.

15. The golf club head of claim 4, wherein within the central region, the maximum thickness of the striking plate is about 3.3 mm or less, the minimum thickness of the striking plate is about 1.8 mm or more, at least a portion of the striking plate has a thickness of less than 2 mm, and the CT at any location on the striking face within 5 mm of the center of the striking face is greater than 240 microseconds.

16. The golf club head of claim 15, wherein within the central region, 20% or more of the striking face has a CT of at least 245 microseconds.

17. The golf club head of claim 16, wherein within the central region, at least 60% of the striking face has a CT of at least 240 microseconds.

18. The golf club head of claim 4, wherein the minimum thickness of the striking plate is 2.4 mm or more, the maximum thickness of the striking plate is 5.0 mm or less, and the striking plate is made from a fiber reinforced polymer material.

19. A golf club head as described in claim 4, further comprising a slot located in the forward region of the golf club head and formed in the sole portion of the golf club head, the slot configured to adjustably hold at least one weight.

20. A golf club head as described in claim 4, further comprising a slot located in the forward region of the golf club head and formed in the sole portion of the golf club head, the slot being a through slot opening to the outside of the golf club head and opening into an internal cavity.

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