Multi-piece golf club head

Abstract

To provide a lightweight club head that bonds different materials having different properties near a striking face portion of a golf club head, by creatively designing a golf club head with multiple different components with varying material properties and shapes to achieve the performance benefits of these new modern materials while maintaining durability of the bonded materials.SOLUTION: A golf club head 100 in accordance with the present invention utilizes multiple portions of different materials to form a frontal portion of the golf club head, allowing more of the frontal portion of the golf club head to be made of a lightweight material to match the lightweight material of an aft body of the golf club head.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention generally relates to multi-piece golf club heads made from various materials. More specifically, a golf club head according to this invention utilizes multiple portions of various materials to form the front portion of the golf club head, and enables more of the front portion of the golf club head to be manufactured from a lightweight material that matches the lightweight material of the aft body of the golf club head.

Background Art

[0002] To assist in improving the performance of golf club heads, golf club designers have continued to experiment with using various components at various positions of the golf club head to achieve various performance criteria. When attempting to bond these types of materials within a golf club head that is subject to such high impact forces, problems often arise when using various materials.

[0003] U.S. Patent No. 5,232,224 (Zeider) exemplifies the use of welding to join various components of a metal wood type golf club mainly made from various metal materials that are mainly stainless steel. Unfortunately, since the welding process can only join metal materials with similar properties, the welding method described in U.S. Patent No. 5,232,224 may not be applicable in situations where materials with significantly different properties need to be joined.

[0004] U.S. Patent No. 7,186,191 (Chen et al.) shows a method of brazing metal materials with different properties. More specifically, U.S. Patent No. 7,186,191 discloses a method of forming a gap between a striker plate and a body portion, and allowing a brazing material to flow into the gap by capillary action to fix two slightly different materials.

[0005] Traditional joining methods such as welding and brazing are very effective when joining metal parts to a golf club head, but they may not be effective when it comes to joining modern lightweight materials such as composite materials.

[0006] U.S. Patent No. 9,452,325 (DeShiell et al.) discloses a multi-material golf club head in which a lightweight crown can be made from composite materials. Because composite materials are not suitable for conventional metal joining processes such as welding and brazing, Patent No. 9,452,325 uses adhesives to join the parts. However, while the use of adhesives is effective for bonding composite materials to metal in areas that are not subjected to large impact forces, bonding these types of materials near the striking face of the golf club head can be difficult.

[0007] To provide a lightweight club head that combines different materials with varying properties near the striking face of the golf club head, it is necessary to creatively design a golf club head with multiple different components that have different material properties and shapes, thereby realizing the performance advantages of these new and modern materials while maintaining the durability of the bonded materials. [Prior art documents] [Patent Documents]

[0008] (1) U.S. Patent No. 5,232,224 (2) U.S. Patent No. 7,186,191 (3) U.S. Patent No. 9,452,325 [Overview of the project]

[0009] In some respects, the technology described herein relates to a golf club head, the golf club head comprising a striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component comprises the striking face component forming the leading edge of the golf club head, and a lightweight face return extension adapted to engage with the rear of the striking face component, wherein the lightweight face return extension is manufactured from a second material, and a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension, wherein the density of the first material is greater than the density of the second material, and no portion of the striking face component is located beyond approximately 30.0 mm from the leading edge when measured along the z-axis.

[0010] In some respects, the technology described herein relates to a golf club head, the golf club head comprising: a striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component forms the leading edge of the golf club head; and a lightweight face return extension adapted to engage with the rear of the striking face component, wherein the lightweight face return extension is manufactured from a second material; and a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension, wherein the density of the first material is greater than the density of the second material; and the golf club head comprises an upper extension overlap ratio between approximately 1 and approximately 2.4, where the upper extension overlap ratio is Upper extension overlap ratio = Upper front overlap distance d3 / Upper rear overlap distance d4 Defined by, The above golf club head has a downward extension overlap ratio between approximately 1 and approximately 2.4, and the downward extension overlap ratio is Lower extension overlap ratio = Lower front overlap distance d5 / Lower rear overlap distance d6 It is defined as follows.

[0011] In some respects, the technology described herein relates to a golf club head, the golf club head comprising a striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component forms the leading edge of the golf club head, and a lightweight face return extension adapted to engage with the rear of the striking face component, wherein the lightweight face return extension further comprises an upper hosel opening adapted to engage with a hosel adapter and a lower hosel opening adapted to engage with a lower hosel component, wherein a threaded fastener engages with the hosel adapter via the lower hosel component, and the lightweight face return extension is manufactured from a second material, comprising a lightweight face return extension and a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension, wherein the density of the first material is greater than the density of the second material.

[0012] These and other features, aspects, and advantages of this invention will be better understood by referring to the following drawings, description, and claims. [Brief explanation of the drawing]

[0013] Prior or other features and advantages of this invention will be apparent from the following description of this invention, as illustrated in the accompanying drawings. The accompanying drawings are incorporated herein and form part of the specification, further describing the principles of this invention and enabling those skilled in the art to practice or utilize this invention.

[0014] [Figure 1] Figure 1 in the attached drawings shows a perspective view of a golf club head according to an embodiment of this invention. [Figure 2] Figure 2 in the attached drawings shows an exploded perspective view of a golf club head according to an embodiment of this invention. [Figure 3] Figure 3 of the attached drawings shows another exploded perspective view of a golf club head according to an embodiment of this invention. [Figure 4] Figure 4 in the attached drawings shows a top crown view of a golf club head according to an embodiment of this invention. [Figure 5] Figure 5 in the attached drawings shows a bottom sole view of a golf club head according to an embodiment of this invention. [Figure 6] Figure 6 of the attached drawings shows a cross-sectional view of a golf club head according to an embodiment of this invention, along the cross-sectional line 6-6' in Figure 5. [Figure 7] Figure 7 in the attached drawings shows an enlarged partial cross-sectional view of the crown transition region of a golf club head according to an embodiment of this invention. [Figure 8] Figure 8 in the attached drawings shows an enlarged partial cross-sectional view of the sole transition region of a golf club head according to an embodiment of this invention. [Figure 9] Figure 9 in the attached drawings shows a cross-sectional view of the hosel portion of a golf club head according to an embodiment of this invention. Detailed description of the invention

[0015] The following detailed description illustrates the best currently considered mode for carrying out this invention. This description should not be interpreted restrictively, as the scope of this invention is best defined by the appended claims, and is therefore provided solely for the purpose of illustrating the general principles of this invention.

[0016] Various features of the present invention are described below, each of which can be used independently of one another or in combination with other features. However, a single feature of the invention may address some or all of the above problems, or it may address only one of the above problems. Further, one or more of the problems described above may not be fully addressed by any of the functions described below.

[0017] Before beginning the discussion of the golf club head of the present invention and its performance criteria, it is useful to note here that the following discussion is based on a coordinate system 101 and measurement axes, which are important for properly evaluating performance numerical values. Thus, while the specific names given to the following measurements are important for understanding the present invention, it is important to recognize here that the nomenclature should not be interpreted alone. Rather, it is important to understand the numerical values shown below in the context of how the coordinate system relates to the golf club head itself. To provide sufficient information to avoid ambiguity, each of the figures provided below that reference the golf club head is provided with a mutually consistent coordinate system.

[0018] In accordance with the above, for the purposes of establishing a reference coordinate system for the following discussion, FIG. 1 of the accompanying drawings shows a coordinate system 101 used to define various measurements and performance numerical values of the present invention. The x-axis used in the present discussion refers to the axis that is horizontal with respect to the striking face in the direction from the heel to the toe. The y-axis used in the present discussion refers to the vertical axis in the direction from the crown to the sole passing through the club. The z-axis used in the present discussion refers to the horizontal axis that is horizontal in the front-rear direction. In other words, the x-axis is defined as the horizontal axis that contacts the geometric center of the striking face in the positive direction toward the heel of the golf club head, the y-axis is the vertical axis that is orthogonal to the x-axis and has a positive direction toward the top of the golf club head, and the z-axis is orthogonal to both the x-axis and the y-axis and has a positive direction toward the front of the golf club head. The x-y-z coordinate system described above shall be the same in all subsequent descriptions.

[0019] Figure 1 of the accompanying drawings shows a perspective view of a golf club head 100 according to an exemplary embodiment of the present invention. The exemplary embodiment of the present invention shown in FIG. 1 may be further composed of several sub-components that make up the golf club head 100 itself. More specifically, the golf club head 100 shown in FIG. 1 may include a striking face component 102, a lightweight face return extension 104, a rear lightweight aft body 110, an upper hosel component 106, and a lower hosel component 108, and the rear lightweight aft body 110 may be formed from several additional parts. The golf club head 100 shown here is structurally unique because it includes a simple and compact striking face component 102 that can be formed from a simple punched metal sheet material, and all the feature parts with more complex geometries, such as the lightweight face return extension 104, the upper hosel component 106, and the lower hosel component 108, are all formed as individual components. The ability to use a punched sheet type of metal material to form the striking face component 102 of the golf club head allows for the use of a greater variety of materials, and some of them are beneficial because they have significant performance advantages.

[0020] In this exemplary embodiment of the present invention, the striking face component 102 may be made from a titanium type of material having a density of about 4.5 g / cc. However, in an alternative embodiment of the present invention, the striking face component 102 may be made from other types of materials that can withstand the impact force of a golf ball without departing from the scope and content of the present invention.

[0021] To illustrate the various components of the golf club head 100 in more detail, an exploded view of the golf club head 100 is shown in Figure 2. In the exploded view shown in Figure 2, it can be seen that the striking face component 202 has a very simple geometric shape with a substantially planar front end, combined with a partial return portion that avoids the hosel portion of the golf club head 200. It should be noted that the return portion of the striking face component 202 is significantly shorter than that of conventional face cup type golf club heads, as the hosel component is formed separately, eliminating the need to manufacture the striking face component 202. The striking face component 202 shown in this embodiment of the invention may generally be made from a titanium-type material due to its high strength and lightweight properties, but in alternative embodiments of the invention, other types of high-strength materials may be used without departing from the scope and content of the invention. Instead of the oversized striking face component of the prior art with a long return, the invention replaces the long portion of the conventional return portion of the face cup design with a lightweight face return extension 204. Since the lightweight face return extension 204 does not include the upper hosel component 206 and the lower hosel component 208, it can be formed from a lightweight composite material, thereby reducing more mass from this part of the golf club head 200 and allowing more discretion for optimization. In this exemplary embodiment of the invention, the lightweight face return extension 204 may be made from a composite type material having a density of less than about 2.0 g / cc, but in alternative embodiments, other types of lightweight materials may be used without departing from the scope and content of the invention, as long as they reduce the overall mass of the golf club head 200. Considering that the striking face component 202 is generally made from titanium material and the lightweight face return extension 204 is made from a composite type material, it can be said that the first material used to form the striking face component 202 has a higher density than the second material used to form the lightweight face return extension 204.

[0022] To further reduce the mass of the lightweight face return extension 204, the lightweight face return extension 204 is provided with a front opening 203 for forming an unsupported striking face portion, thereby allowing the striking face component 202 to be attached to the lightweight face return extension 204 so as to be supported only around its periphery. However, in alternative embodiments of this invention, without departing from the scope and content of this invention, the lightweight face return extension 204 may fully support the striking face component 202 without the front opening 203.

[0023] Here, the upper hosel component 206 shown in Figure 2 is generally attached to the upper opening 205 of the lightweight face return extension 204 and is generally made of a metallic material such as titanium. The upper hosel component 206 is made of titanium because such a component is also subjected to high stress levels when it is attached to the shaft adapter 207 to engage with the golf shaft. Opposite the upper hosel component 206 is the lower hosel component 208, which is attached to the complementary lower hosel opening 311 (shown in Figure 3) of the lightweight face return extension 204. This lower hosel component 208 is not subjected to as much stress as the upper hosel component 206 and can therefore be made from a different metallic material such as steel instead of titanium. However, steel, which has a higher density than titanium, may also be useful in adjusting the center of gravity of the golf club head 200 to be lower and further forward, and in any case, it is often a desirable location for the weight. A threaded fastener 209 is also shown in Figure 2, which is configured to engage with the shaft adapter 207, allowing the hosel component to be secured together with the lightweight face return extension 204. The rear lightweight aft body 210, shown herein in the exploded view of Figure 2, further comprises a lightweight crown subshell 212, a lightweight sole subshell 214, an inner weight housing 216, an outer weight housing 218, a high-density weight section 220, and a thread 222. Further details relating to the structure of the rear lightweight aft body 210, along with various weighting components, are described in U.S. Patent Application Publication No. 2022 / 0219049, the entire disclosure of which is incorporated by reference.

[0024] Figure 3 of the attached drawings shows exploded perspective views of a golf club head 300 according to an exemplary embodiment of the present invention from different angles, providing different views of various components. In this figure, the front portion of the golf club head 300 shows a striking face component 302 having a relatively small return portion as previously shown. The striking face component 302 is adapted to engage with a lightweight face return extension 304, which further has an upper hosel opening 305 and a lower hosel opening 311. The upper hosel opening 305 is adapted to engage with an upper hosel component 306, and the lower hosel opening 311 is adapted to engage with a lower hosel component 308. The upper hosel component 306 is adapted to engage with a shaft adapter 307, and the lower hosel component 308 is adapted to engage with a shaft adapter 307. This is configured to engage with a threaded fastener 309, which ultimately engages with the shaft adapter 307 to secure all the aforementioned components together. The rear of these front components is attached to a lightweight aft body 310, which consists of a lightweight crown subshell 312, a lightweight sole subshell 314, an inner weight housing 316, an outer weight housing 318, a high-density mass 320, and a screw 322, all of which function in the same manner as described above in Figure 2.

[0025] Figure 4 of the attached drawings shows a top view of a golf club head 400 according to one embodiment of the present invention. In this top view of the golf club head 400, a striking face component 402 with a shortened return distance is visible at the front of the golf club head 400, and a lightweight face return extension 404 is attached to the aft portion of the golf club head 400. Finally, a rear lightweight aft body 410 is connected to the aft portion of the lightweight face return extension 404 to complete the golf club head 400. In this top view of the golf club head 400, the golf club head 400 is viewed from the xz plane of the coordinate system 401, as shown in the coordinates. The face is square and the hosel is positioned at a lie angle of 60 degrees.

[0026] In this top view of the golf club head 400, it can be seen that there is a front surface 430 located along the xy plane at the leading edge 431 of the golf club head 400, forming the foremost position of the golf club, and the distance from the front surface 430 to the striking face component 402 and the lightweight face return extension 404 can be measured. Here, as shown in Figure 4, the depth distance d1 of the striking face component is measured from the front surface 430 toward the rear end of the striking face component, and is generally less than about 30.0 mm, more preferably less than about 27.5 mm, and most preferably less than about 25 mm. In other words, it can be said that any part of the striking face component is located at a position of about 30.0 mm or less from the leading edge 431 along the z axis, more preferably at a position of about 27.5 mm or less from the leading edge 431 along the z axis, and most preferably at a position of about 25 mm or less from the leading edge 431 along the z axis.

[0027] Figure 4 of the attached drawings also shows that the lightweight face return extension distance d2, measured from the front surface 430 to the rearmost point of the lightweight face return extension 404, is generally greater than about 40.0 mm, more preferably greater than about 42.5 mm, and most preferably greater than about 45.0 mm. In other words, the rearmost point of the lightweight face return extension 404 is located at a distance of about 40.0 mm or more from the leading edge along the z-axis, more preferably at a distance of about 42.5 mm or more from the leading edge along the z-axis, and most preferably at a distance of about 45.0 mm or more from the leading edge along the z-axis.

[0028] Since the return extension distance d2 of the lightweight face is measured from the front face 430, simply subtracting the striking face component depth d1 from the return extension distance d2 of the lightweight face gives the component distance of the return extension depth of the lightweight face, which is greater than about 10.0 mm, more preferably greater than about 15.0 mm, and most preferably greater than about 20.0 mm.

[0029] Figure 5 of the attached drawings shows a sole view of a golf club head 500 according to an alternative embodiment of the present invention. In this sole view, a cross section line 6-6' is shown that crosses the center of the golf club head 500 and passes through the leading edge 531, allowing for a more detailed description of the coupling between the striking face component 502, the lightweight return extension 504, and the remaining rear lightweight aft body 510.

[0030] Figure 6 of the attached drawings shows a cross-sectional view of the golf club head 600 along the cross-sectional line 6-6' shown in Figure 5. In the cross-sectional view of the golf club head 600 shown in Figure 6, it can be seen that the striking face component 602 forms the front portion of the golf club head 600 and has a stubby return portion 630 that is shortened in distance to reduce mass and facilitate manufacturing. The weight is reduced by incorporating the shortened, stubby return portion 630. This is because the material used to form the striking face component 602 generally needs to be made from high-strength material to withstand the impact force of the golf ball, and these materials are generally heavier than the material used to form the other components of the golf club head 600, which do not require such high strength. Manufacturing is facilitated by incorporating the stubby return portion 630. This is because the striking face component 602 has a more squat shape, eliminating the need to form various accessory components of the golf club head 600, such as the hosel, which were previously formed as an integral part of the conventional face cup structure. Eliminating the need to form such components allows the striking face component 602 to be easily manufactured from a stamped sheet of titanium material, including simple bends that form a more robust return portion 630, resulting in significantly easier manufacturing of the component.

[0031] In the cross-sectional view shown in Figure 6, the connection between the striking face component 602 and the lightweight face return extension 604 can be seen. The two components are joined via an overlapping joint, as shown in Figure 5. The striking face component 602 forms the outer portion of the golf club head 600 at the joint. Similarly, the connection between the lightweight face return extension 604 and the rear lightweight aft body 610 is also achieved via an overlapping joint, as shown in Figure 6, where the lightweight face return extension 604 forms the outer portion of the golf club head 600 at the joint. While joining adjacent components using overlap joints is not new, when applying it to the joining of golf club components, this invention is unique in the overlap distance between the striking face component 602, the lightweight face return extension 604, and the lightweight aft body 610 and their relative overlap distances from one another, which are unique and important to this invention as they help distribute the stress that the golf club experiences when it collides with the golf ball.

[0032] To better illustrate these important measurements and generate ratios, enlarged views of the upper and lower parts of the lightweight face return extension 604 are provided in Figures 7 and 8.

[0033] Figure 7 of the attached drawings shows an enlarged partial cross-sectional view of the upper part of a lightweight face return extension 704 according to one embodiment of the present invention. In this enlarged partial cross-sectional view, it can be seen that the overlap between the upper part of the striking face component 702 and the upper part of the lightweight face return extension 704 is identified as the upper front overlap distance d3. According to the present invention, the upper front overlap distance d3 may generally be between about 8.0 mm and about 12.0 mm, more preferably between about 9.0 mm and about 11.0 mm, and most preferably about 10.0 mm. The upper rear overlap distance d4 shown in Figure 4 measures the overlap between the upper part of the lightweight face return extension 704 and the upper part of the lightweight aft body 710, and is generally between about 5.0 mm and about 8.0 mm, more preferably between about 6.0 mm and 7.0 mm, and most preferably about 6.7 mm. The ratio of the front and rear overlap distances of the lightweight face return extension 704 helps quantify the amount of overlap needed to help distribute the impact stress between the golf club head and the golf ball, and is quantified here as the upper extension overlap ratio, defined by equation (1) below. Upper extension overlap ratio = Upper front overlap distance d3 / Upper rear overlap distance d4 Equation (1) The upper extension overlap ratio according to this invention is between about 1 and about 2.4, more preferably between about 1.2 and about 1.8, and most preferably about 1.4.

[0034] Figure 8 of the attached drawings shows an enlarged partial cross-sectional view of the lower part of a lightweight face return extension 804 according to an embodiment of the present invention, also showing the striking face component 802 and the rear lightweight aft body 810. The overlapping joint shown here is similar to the one shown on the upper part of the lightweight face return extension 704 in Figure 7, but with significantly different dimensions. First and foremost, according to the present invention, the lower front overlap distance d5 may generally be between about 8.0 mm and about 12.0 mm, more preferably between about 9.0 mm and about 11.0 mm, and most preferably about 10.0 mm. This is similar to the value of the upper front overlap distance d5 disclosed previously. Similarly, the lower rear overlap distance d6 in this embodiment is also designed to be very close to the upper overlap distance d4 shown in Figure 7. More specifically, the lower rear overlap distance d6 may generally be between approximately 5.0 mm and approximately 8.0 mm, more preferably between approximately 6.0 mm and approximately 7.0 mm, and most preferably approximately 6.7 mm. The ratio of the front and rear overlap distances of the lightweight face return extension 804 helps to quantify the amount of overlap required to help distribute the impact stress between the golf club head and the golf ball, which is quantified here as the lower extension overlap ratio and is defined by the following equation (1). Lower extension overlap ratio = Lower front overlap distance d5 / Lower rear overlap distance d6 Equation (2) The overlap ratio of the upper extension according to this invention is between about 1 and about 2.4, more preferably between about 1.2 and about 1.8, and most preferably about 1.4.

[0035] Figure 9 in the attached drawings shows a cross-sectional view of the hosel portion of a golf club head, illustrating in more detail the various components that make up the hosel portion of the golf club head and showing their interrelationships. More specifically, in Figure 9, it can be seen that the hosel portion includes a shaft adapter 907 located at the top of the hosel portion, which is adapted to engage with the upper hosel component 906. The lower hosel component 908 enters from the bottom of the hosel portion and engages with the upper hosel component 906 via a threaded fastener that screws into the shaft adapter 907. These hosel components work together to attach to the lightweight face return extension 903 to complete the hosel area of ​​the golf club head.

[0036] Outside of the examples, or unless otherwise specified, all numbers, ranges, quantities, values, and percentages, such as the quantity of material, moment of inertia, center of gravity, loft, draft angle, various performance ratios, etc., in the specification, can be understood as having an approximate value, quantity, or range, even if the term "approximate" is not explicitly stated. Therefore, unless otherwise indicated, the numerical parameters in the specification and claims are approximations, which vary depending on the desired properties that are to be achieved by this invention. No intention is made to preclude the application of the doctrine of equivalents in the claims, but at the very least, the parameters of each quantity should be understood under the reported number of decimal places and grasped by ordinary rounding techniques.

[0037] Although the ranges and parameters of quantities that represent the broad scope of this invention are approximations, the values ​​of quantities shown in the examples of the specification are reported as accurately as possible. However, each value of quantity inherently contains the necessary error resulting from the standard deviation found in the measurements of each experiment. Furthermore, where ranges of quantities are given for various matters, it should be understood that combinations of these ranges can be used.

[0038] The above relates to illustrative embodiments of this invention, and it should be noted that modifications can be made without departing from the scope and extent of the invention as set forth in the following claims. The following technical features described here will be removed. [Technical Feature 1] In golf club heads, A striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component forms the leading edge of the golf club head, A lightweight face return extension adapted to engage with the rear of the above-mentioned striking face component, wherein the lightweight face return extension is manufactured from a second material, It has a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension mentioned above, The density of the first material described above is greater than the density of the second material described above. A golf club head characterized in that no part of the above-mentioned striking face component is located beyond approximately 30.0 mm from the leading edge when measured along the z-axis. [Technical Feature 2] The golf club head described in Technical Feature 1, wherein no part of the above striking face component is located beyond approximately 27.5 mm from the leading edge when measured along the above z-axis. [Technical Feature 3] The golf club head described in Technical Feature 2, wherein no part of the above striking face component is located beyond approximately 25 mm from the leading edge when measured along the z-axis. [Technical Feature 4] The golf club head described in Technical Feature 1, wherein the rearmost part of the lightweight face return extension is located at a distance of more than approximately 40.0 from the leading edge, as measured along the z-axis. [Technical Feature 5] The golf club head described in technical feature 4, wherein the rearmost part of the lightweight face return extension is located at a distance of more than approximately 42.5 from the leading edge, as measured along the z-axis. [Technical Feature 6] The golf club head described in technical feature 5, wherein the rearmost part of the lightweight face return extension is located at a distance of more than approximately 45.0 from the leading edge, as measured along the z-axis. [Technical Feature 7] The above golf club head has an upper extension overlap ratio between approximately 1 and approximately 2.4, and the above upper extension overlap ratio is Upper extension overlap ratio = Upper front overlap distance d3 / Upper rear overlap distance d4 A golf club head as defined in Technical Feature 4. [Technical Feature 8] The golf club head described in technical feature 7, wherein the overlap ratio of the upper extension is between approximately 1.2 and approximately 1.8. [Technical Feature 9] The golf club head described in technical feature 8, wherein the overlap ratio of the upper extension portion is approximately 1.4. [Technical Feature 10] The above golf club head has a downward extension overlap ratio between approximately 1 and approximately 2.4, and the downward extension overlap ratio is Lower extension overlap ratio = Lower front overlap distance d5 / Lower rear overlap distance d6 A golf club head as defined in Technical Feature 7. [Technical Feature 11] The golf club head described in technical feature 10, wherein the overlap ratio of the lower extension is between approximately 1.2 and approximately 1.8. [Technical Feature 12] The golf club head described in technical feature 11, wherein the overlap ratio of the lower extension portion is approximately 1.4. [Technical Feature 13] In golf club heads, A striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component forms the leading edge of the golf club head, A lightweight face return extension adapted to engage with the rear of the above-mentioned striking face component, wherein the lightweight face return extension is manufactured from a second material, It has a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension mentioned above, The density of the first material described above is greater than the density of the second material described above. The above golf club head has an upper extension overlap ratio between approximately 1 and approximately 2.4, and the above upper extension overlap ratio is Upper extension overlap ratio = Upper front overlap distance d3 / Upper rear overlap distance d4 Defined by, The above golf club head has a downward extension overlap ratio between approximately 1 and approximately 2.4, and the downward extension overlap ratio is Lower extension overlap ratio = Lower front overlap distance d5 / Lower rear overlap distance d6 A golf club head characterized by being defined as follows. [Technical Feature 14] The overlap ratio of the above-mentioned upper extension is between approximately 1.2 and 1.8, and The golf club head described in technical feature 13, wherein the overlap ratio of the lower extension is between approximately 1.2 and 1.8. [Technical Feature 15] The overlap ratio of the above-mentioned upper extension is approximately 1.4, and The golf club head described in technical feature 14, having an overlap ratio of approximately 1.4 for the lower extension portion. [Technical Feature 16] The golf club head described in technical feature 13, wherein no part of the above striking face component is located beyond approximately 30.0 mm from the leading edge when measured along the z-axis. [Technical Feature 17] The golf club head described in technical feature 16, wherein no part of the above striking face component is located beyond approximately 27.5 mm from the leading edge when measured along the above z-axis. [Technical Feature 18] The golf club head described in technical feature 17, wherein no part of the above striking face component is located beyond approximately 25 mm from the leading edge when measured along the above z-axis. [Technical Feature 19] In golf club heads, A striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component forms the leading edge of the golf club head, A lightweight face return extension adapted to engage with the rear of the above-mentioned striking face component, The above lightweight face return extension further, It has an upper hosel opening adapted to engage with a hosel adapter and a lower hosel opening adapted to engage with a lower hosel component, A threaded fastener engages with the hosel adapter via the lower hosel component. The above lightweight face return extension is manufactured from a second material, and the above lightweight face return extension is manufactured from a second material. It has a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension mentioned above, A golf club head characterized in that the density of the first material described above is greater than the density of the second material described above. [Technical Feature 20] The golf club head described in technical feature 19, wherein no part of the above striking face component is located beyond approximately 30.0 mm from the leading edge when measured along the z-axis. [Explanation of symbols] 100 Golf Club Heads 101 Coordinate System 102 Hitting Face Components 104 Lightweight Face Return Extension 106 Upper hosel component 108 Lower hosel component 110 Rear Lightweight Aft Body 200 Golf Club Heads 202 Impact Face Components 203 Front opening 204 Lightweight Face Return Extension 205 Upper opening 206 Upper hosel component 207 Shaft Adapter 208 Lower hosel component 209 Screw fastener 210 Rear Lightweight Aft Body 212 Lightweight Crown Subshell 214 Lightweight Sole Subshell 216 Inner weight housing 218 Outer weight housing 220 High density weight part 222 Screws 300 Golf Club Heads 302 Impact Face Components 304 Lightweight Face Return Extension 305 Upper hosel opening 306 Upper hosel component 307 Shaft Adapter 308 Lower hosel component 309 Fastener 310 Lightweight Aft Body 311 Lower hosel opening 312 Lightweight Crown Subshell 314 Lightweight Sole Subshell 316 Inner weight housing 318 Outer weight housing 320 High density mass 322 Screws 400 Golf Club Heads 401 Coordinate System 402 Impact Face Components 404 Lightweight Face Return Extension 410 Rear Lightweight Aft Body 430 Front 431 Leading Edge 500 Golf Club Heads 502 Impact Face Components 504 Lightweight Return Extension 510 Rear Lightweight Aft Body 531 Leading Edge 600 Golf Club Heads 602 Impact Face Components 604 Lightweight Face Return Extension 610 Rear Lightweight Aft Body 630 Return section 702 Impact Face Components 704 Lightweight Face Return Extension 710 Lightweight Aft Body 802 Impact Face Component 804 Lightweight Face Return Extension 810 Rear Lightweight Aft Body 903 Lightweight Face Return Extension 906 Upper hosel component 907 Shaft Adapter 908 Lower hosel component

Claims

1. In golf club heads, A striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component forms the leading edge of the golf club head, A lightweight face return extension adapted to engage with the rear of the above-mentioned striking face component, wherein the lightweight face return extension is adapted to mount a hosel, and the lightweight face return extension is manufactured from a second material, It has a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension mentioned above, The density of the first material described above is greater than the density of the second material described above. None of the above striking face components is located beyond 30.0 mm from the leading edge when measured along the z-axis. The golf club head is characterized in that the hosel has an upper hosel component located on the upper heel side of the lightweight face return extension and a lower hosel component located on the lower heel side of the lightweight face return extension, and the upper hosel component is manufactured from titanium.

2. The golf club head according to claim 1, wherein no part of the striking face component is located beyond 27.5 mm from the leading edge when measured along the z-axis.

3. The golf club head according to claim 2, wherein no portion of the striking face component is located beyond 25 mm from the leading edge when measured along the z-axis.

4. The golf club head according to claim 1, wherein the rearmost part of the lightweight face return extension is located at a distance of more than 40.0 mm from the leading edge, as measured along the z-axis.

5. The golf club head according to claim 4, wherein the rearmost part of the lightweight face return extension is located at a distance of more than 42.5 mm from the leading edge, as measured along the z-axis.

6. The golf club head according to claim 5, wherein the rearmost part of the lightweight face return extension is located at a distance of more than 45.0 mm from the leading edge, as measured along the z-axis.

7. The above golf club head has an upper extension overlap ratio between 1 and 2.4, and the above upper extension overlap ratio is Upper extension overlap ratio = Upper front overlap distance d3 / Upper rear overlap distance d4 A golf club head as defined in claim 4.

8. The golf club head according to claim 7, wherein the overlap ratio of the upper extension portion is between 1.2 and 1.

8.

9. The golf club head according to claim 8, wherein the overlap ratio of the upper extension portion is 1.

4.

10. The above golf club head has a downward extension overlap ratio between 1 and 2.4, and the downward extension overlap ratio is Lower extension overlap ratio = Lower front overlap distance d5 / Lower rear overlap distance d6 A golf club head as defined in claim 7.

11. The golf club head according to claim 10, wherein the overlap ratio of the lower extension portion is between 1.2 and 1.

8.

12. The golf club head according to claim 11, wherein the overlap ratio of the lower extension portion is 1.

4.

13. In golf club heads, A striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component forms the leading edge of the golf club head, A lightweight face return extension adapted to engage with the rear of the above-mentioned striking face component, wherein the lightweight face return extension is adapted to mount a hosel, and the lightweight face return extension is manufactured from a second material, It has a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension mentioned above, The density of the first material described above is greater than the density of the second material described above. None of the above striking face components is located beyond 30.0 mm from the leading edge when measured along the z-axis. The above golf club head has an upper extension overlap ratio between 1 and 2.4, and the above upper extension overlap ratio is Upper extension overlap ratio = Upper front overlap distance d3 / Upper rear overlap distance d4 Defined by, The above golf club head has a downward extension overlap ratio between 1 and 2.4, and the downward extension overlap ratio is Lower extension overlap ratio = Lower front overlap distance d5 / Lower rear overlap distance d6 Defined by, The golf club head is characterized in that the hosel has an upper hosel component located on the upper heel side of the lightweight face return extension and a lower hosel component located on the lower heel side of the lightweight face return extension, and the upper hosel component is manufactured from titanium.

14. In golf club heads, A striking face component located at the front of the golf club head, adapted for striking a golf ball, and comprising a return portion, wherein the striking face component is manufactured from a first material, and the striking face component forms the leading edge of the golf club head, A lightweight face return extension adapted to engage with the rear of the above-mentioned striking face component, The above lightweight face return extension is adapted to accommodate the hosel. The above lightweight face return extension further, It has an upper hosel opening adapted to engage with an upper hosel component, and a lower hosel opening adapted to engage with a lower hosel component, A threaded fastener engages with the shaft adapter via the lower hosel component and the upper hosel component. The above lightweight face return extension is manufactured from a second material, and the above lightweight face return extension is made of a second material. It has a rear lightweight aft body adapted to engage with the rear of the lightweight face return extension mentioned above, The density of the first material described above is greater than the density of the second material described above. None of the above striking face components is located beyond 30.0 mm from the leading edge when measured along the z-axis. The golf club head is characterized by the fact that the upper hosel component is manufactured from titanium material.

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