Multi-material golf club head

Abstract

To provide a golf club using a lightweight composite rear body that enables sufficient structural rigidity, preferable sound, and preferable performance.SOLUTION: The present invention relates to a multi-material golf club head having a metal front portion and a lightweight rear portion to which an internal ribbon support member is added. The multi-material golf club head includes a front volume chamber part 1446 and a rear volume chamber part 1444 divided by a secondary wall 1442. A weighting system 1440 is connected to the rear volume chamber part 1444. The volume of the front volume chamber part 1446 is 12.6 to 19.1 times the volume of the rear volume chamber part 1444.SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] This invention generally relates to a multi-material golf club head with improved performance. More specifically, this invention relates to a multi-material golf club head having a metallic front portion and a lightweight rear portion with an added internal ribbon support member. The internal ribbon support member significantly improves the structural rigidity of the lightweight rear portion and helps improve the acoustic performance of the golf club head itself. This invention may also include a weighting mechanism that is accessible through an opening in the lightweight rear portion but is directly coupled to the metallic front portion, alleviating any structural integrity issues associated with the attachment of weights to the lightweight portion of the golf club head.

Background Art

[0002] The use of weighting elements to improve the performance of golf club heads is known in the industry. U.S. Patent No. 3,692,306 (Glover), filed in 1971, shows one of the earliest golf clubs with a weighting mechanism. By using different materials with essentially different density and weight characteristics, the performance of the golf club head can be improved.

[0003] Modern golf club heads, particularly metalwood type golf club heads, have continuously utilized weighting to improve the performance of the golf club head. U.S. Patent No. 8,951,143 (Morales et al.) teaches a weight attachment mechanism where a weight member is coupled to a bracket, as one of the more modern ideas.

[0004] When lightweight composite materials are used to form part of a golf club head, the problem of adding weight to the golf club head becomes even more complex. Lightweight composite materials are very strong in the orientation perpendicular to the fibers, but can often become weak when subjected to forces in other orientations. Therefore, adding weight to a lightweight composite golf club head is often difficult. U.S. Patent No. 8,979,671 (DeMille et al.) shows one solution to this problem by strengthening the material around the weight and adding support members.

[0005] Therefore, it can be seen that there is a need in the industry to create golf clubs that utilize a lightweight composite rear body that enables sufficient structural rigidity, good sound, and good performance.

[0006] Furthermore, adding material thickness and support members to strengthen the material around the weight can have the undesirable side effect of adding weight in unwanted locations. Therefore, based on the above, when a golf club head forms part of the golf club head itself using a lightweight second material, it is necessary to assist in improving the weight attachment mechanism of the golf club head and, moreover, to avoid the negative side effects associated with conventional methods. Furthermore, adding material thickness and support members to strengthen the material around the weight can have the undesirable side effect of adding weight in unwanted locations. Therefore, based on the above, when a golf club head forms part of the golf club head itself using a lightweight second material, it is necessary to assist in improving the weight attachment mechanism of the golf club head and, moreover, to avoid the negative side effects associated with conventional methods.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0008] One aspect of this invention is a golf club head having a front striking face portion with one or more threaded receptacles and a rear body attached to the rear of the front striking face portion. The rear body portion further includes a lightweight shell having one or more weight openings and an internal ribbon support member attached to the inner surface of the lightweight shell around the skirt of the lightweight shell. The internal ribbon support member further has a secondary wall, and this secondary wall further includes a portion. The entire internal volume of the golf club head is separated into a front volume chamber portion and a rear volume chamber portion, and the volume ratio of the golf club head is between about 12.6 and about 19.1. This volume ratio is defined as follows. Volume ratio = (Volume of the front volume chamber portion) / (Volume of the rear volume chamber portion)

[0009] Another aspect of this invention is a golf club head comprising a front striking face portion with one or more threaded receptacles and a rear body attached to the rear of the front striking face portion. The rear body portion further includes a lightweight shell having one or more weight openings and an internal ribbon support member attached to the inner surface of the lightweight shell around the skirt of the lightweight shell. The internal ribbon support member further has a secondary wall, and this secondary wall separates the entire internal volume of the golf club head into a front volume chamber portion and a rear volume chamber portion. The golf club head has a front volume chamber portion that constitutes about 82% to about 91% of the entire internal volume of the golf club head.

[0010] Another aspect of the invention is a golf club head comprising a front striking face portion having one or more threaded receptacles, and a rear body attached to the rear of the front striking face portion. The rear body portion further comprises a lightweight shell having one or more weight openings, and an internal ribbon support member attached to the inner surface of the lightweight shell around the skirt of the lightweight shell, the internal ribbon support member further having a secondary wall which divides the entire internal volume of the golf club head into a front volume chamber portion and a rear volume chamber portion, the golf club head comprising a front volume chamber portion which is configured between about 82% and about 91% of the entire internal volume of the golf club head, and wherein more than about 15 percent of the total mass of the golf club head is located behind and to the rear of the secondary wall.

[0011] Another aspect of the invention is a golf club head having a front striking face portion comprising one or more threaded receptacles, and a rear body attached to the rear of the front striking face portion. The rear body portion further comprises a lightweight shell having one or more weight openings, and an internal ribbon support member attached to the inner surface of the lightweight shell around the skirt of the lightweight shell, the internal ribbon support member having a plurality of cutouts and the internal ribbon support member having a mass of less than about 5.0 grams.

[0012] In another aspect of the invention, the internal ribbon support member further has internal components and external components.

[0013] In another aspect of the invention, the internal components and the external components combine to form a diamond-shaped internal ribbon support member.

[0014] Another aspect of the invention is a golf club head that generates a sound having a critical time T greater than about 0.01 seconds and less than about 0.02 seconds. critical The critical time T critical is defined as the time it takes for the sound to swing from the peak amplitude A max to the 10% point of the peak amplitude A max .

[0015] Another aspect of the present invention is a golf club head having a front striking face portion with one or more threaded receptacles and a rear body attached to the rear of the front striking face portion. The rear body portion has a lightweight shell having one or more weight openings, an internal ribbon support member attached to the inner surface of the lightweight shell around the skirt of the lightweight shell, and one or more threaded weights inserted through the one or more weight openings and engaging the one or more threaded receptacles. Both the lightweight shell and the internal ribbon support member are manufactured from a fiber reinforced polymer.

[0016] Another aspect of the present invention is a golf club head having a front striking face portion with two or more threaded receptacles and a rear body portion attached to the rear of the front striking face portion. The rear body portion further has a lightweight shell having two or more weight openings, an internal ribbon support member attached to the inner surface of the lightweight shell around the skirt of the lightweight shell, and two or more threaded weights inserted through the one or more weight openings and engaging the two or more threaded receptacles. The two or more threaded weights are spaced apart by a distance between about 80 mm and about 120 mm.

[0017] These and other features, aspects, and advantages of the present invention will be better understood by reference to the following drawings, description, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The foregoing and other features and advantages of the present invention will become apparent from the following description of the invention, as illustrated in the accompanying drawings. The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate the principles of the invention and further serve to enable one skilled in the art to practice and use the invention.

[0019]

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[0020] The following detailed description describes the presently contemplated best mode for practicing the invention. This description is not to be construed in a limiting sense, but is made for the purpose of illustrating the general principles of the invention, as the scope of the invention is most clearly defined by the appended claims.

[0021] The various features of this invention are described below, each of which can be used independently of one another or in combination with other features. However, a single inventive feature may address only one of the above problems, or may not address some or all 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.

[0022] Figure 1 of the accompanying drawings shows a perspective view of a golf club head 100 according to an embodiment of the present invention. Although this perspective view of the present invention may not be immediately apparent in this figure, it shows that the golf club head is separated into two main sub-components, namely a front striking face portion 102 having an actual striking face insert 101, and a rear body portion 104. These components are specifically identified because they are generally made of different materials. The front striking face portion 102 may generally be made of a metallic material such as titanium, while the rear body portion 104 may generally be made of a lightweight material such as a fiber-reinforced polymer. Details regarding fiber-reinforced polymer materials suitable for this rear body portion 104 can be found in U.S. Patent Application Publication No. 2020 / 0023247 (Larsen et al.) and U.S. Patent Application Publication No. 2020 / 0188746 (Sugimae et al.) related to the applicant's application, and the disclosures of both are hereby incorporated by reference in their entirety.

[0023] Figure 2 of the accompanying drawings shows a front view of the golf club head 200, which shows the face insert 201, and the face center 203 is part of the front striking face portion 202. Figure 2 of the accompanying drawings shows the coordinate system 205 used to assist in identifying the axis of this invention. The x-axis is directed from heel to toe, and the positive x-direction is directed towards the heel of the golf club head 200. The y-axis is directed from crown to sole, and the positive y-axis is directed towards the crown of the golf club head 200. Finally, the z-axis is directed from front to back, and the positive z-direction points to the front of the golf club head 200. This front view provides a reference point when the golf club head 200 is sectioned in several subsequent figures. The section line A-A' provides a basis for sectioning the golf club head 200 at the face center 203 in the direction from crown to sole. The section line B-B' provides a basis for sectioning the golf club head 200 at the face center 203 in the direction from heel to toe. Finally, the section line C-C' provides a basis for sectioning the golf club head 200 along one of the weighting systems unique to this invention.

[0024] To provide more context by the position of the cross-section line C-C' shown in FIG. 2, a sole view of the golf club head 300 according to an exemplary embodiment of the present invention is shown in FIG. 3. FIG. 3 shows a sole view of the golf club head 300 according to an exemplary embodiment of the present invention, enabling the weight opening 310 to be shown in more detail together with the cross-section line C-C' passing through the center of the weight opening 310. More specifically, in this embodiment of the present invention, the golf club head 300 includes a toe-side weight opening 310a and a heel-side weight opening 310b to enable a plurality of weighting systems to be installed in the golf club head 300. In this exemplary embodiment of the present invention, the positions of the toe-side weight opening 310a and the heel-side weight opening 310b, corresponding respectively to the positions of the toe-side weight 438a and the heel-side weight 438b, are separated by a distance D1 between about 80 mm and about 120 mm, more preferably between about 90 mm and about 110 mm, and most preferably about 100 mm. Alternatively, it can be said that the position of the toe-side screw weight 438a and the position of the heel-side screw weight 438b are separated by a distance D1 between about 80 mm and about 120 mm, more preferably between about 90 mm and about 110, and most preferably about 100 mm. In addition to the above, this sole view of the golf club head 300 also enables a clearer visualization of the separation between the front striking face portion 302 and the rear body portion 304. Finally, FIG. 3 of the accompanying drawings shows a joint cover 320 covering the joint between the front striking face portion 302 and the rear body portion 304, and a sole plate 322 attached to the sole immediately behind the joint cover 320, the details of both of which will become clearer in the subsequent figures.

[0025] Figure 4 of the accompanying drawings shows an exploded view of a golf club head 400 according to this invention. In this exploded view, not only can external components be shown, but also the relationship between internal components and external components can be shown. Before referring to the details of specific components, it can be seen here that the golf club head 400 is still separated into a front hitting face portion 402 and a rear body portion 404. The front hitting face portion further has a plurality of threaded receptacles 439, which may be further identified as a toe-side threaded receptacle 439a and a heel-side threaded receptacle 439b. The rear body portion 404 may be further composed of an internal weight cover 430, a weighting member 432, an internal ribbon support member 434, a lightweight shell 436 having at least one weight opening 410 (only the heel-side weight opening 410b is shown in FIG. 4), and two screw weights 438, which may be specifically identified as a toe screw weight 438a and a heel screw weight 438b.

[0026] Here, although the screw weight 438 of this invention appears spatially at the rear end of the golf club head 400, it is noted that by being inserted into the weight opening 410 on the lightweight shell 436 of the rear body portion 404, it actually engages with the threaded receptacle 439 disposed in the front striking face portion 402. The attachment method here is important for the proper functioning of this invention as it addresses several major drawbacks of conventional weight attachment mechanisms. Traditionally, in order to form the lightweight shell 436 using lightweight materials, these materials do not have sufficient strength to withstand the vibrations of the high-density weights when colliding with a golf ball, so it is difficult to attach a high-density weighting mechanism directly to these materials. Alternatively, although the weight can generally be attached directly to the metal front striking face portion 402, it is not always desirable to place the weight very close to the front face of the face. This invention addresses both of these problems by creating a weight opening 510 within the lightweight shell 436 into which the screw weight 438 can be directly attached to the threaded receptacle 439 within the metal front striking face portion 402 of the golf club head.

[0027] In addition to the above, the exploded view of the golf club head 400 shown in FIG. 4 also shows the joint cover 420 together with the sole plate 422, which are spatially oriented between the front striking face portion 402 and the rear body portion 404 of the golf club head 400, not only improving the connection between the two components but also assisting in protecting the rear body portion 404, which tends to be vulnerable to damage when colliding with the ground during a golf swing.

[0028] Finally, the internal weight cover 430, the weighting member 432, and the internal ribbon support member 434 are also important for the proper functioning of this invention that is not related to the weighting mechanism. Although not visible from the outside, the internal ribbon support member 434 is one of the radical and most important components for achieving the improved performance of the golf club head 400 according to this invention. The internal ribbon support member 434 is attached to the inner surface of the lightweight shell 436 around the skirt portion of the lightweight shell 436 described above. The skirt or ribbon of the golf club head 400 is an industry term that refers to the junction between the crown of the golf club head 400 and the sole of the golf club head 400. As shown in this current embodiment of this invention, the internal ribbon support member 434 may generally be made from a fiber-reinforced polymer, which is adhesively bonded or diffusion bonded to the lightweight shell 436. However, it should be noted that the internal ribbon support member 434 can be made from all lightweight or non-lightweight alternative materials without departing from the scope and content of this invention as long as it can enhance the structural rigidity of the rear body portion 404. The internal ribbon support member has at least the following four distinguishable advantages. That is, 1) it enables the weighting member 432 to be attachable behind the lightweight shell 436. 2) It improves the connection between the front hitting face portion 402 and the rear body portion 404. 3) When using a fiber-reinforced polymer to form the lightweight shell 436, it increases the structural rigidity of the rear body portion to prevent failure. 4) It enhances the acoustic characteristics of the golf club head 400 when it contacts the golf ball.

[0029] First, the internal ribbon support member 434 enables the weighting member 432 to be properly fixed to the lightweight shell 436 of the rear body portion 404 of the golf club head 400. The weighting member 432 in this embodiment is disposed at the rearmost portion of the golf club head 400 to assist in improving the moment of inertia of the golf club head 400. The weighting member 432 may generally be made of a high-density metal material such as tungsten, and, as is generally the case with these types of golf club heads 400, particularly if the lightweight shell 436 is made of a fiber-reinforced polymer, it will generally be necessary to bond the weighting member 432 to the lightweight shell 436 with an adhesive. To address the bonding issues that generally occur when a heavy weighting member 432 is attached to a fiber-reinforced polymer, the internal weight cover 430 may be used to assist in fixing the weighting member 432 to the lightweight shell 436. Due to the fact that the thickness of the lightweight shell 436 is very thin for weight reduction, combined with the shape that converges to the small edge of the lightweight shell 436 at the rear of the golf club head 400, the structural rigidity of the lightweight shell 436 at the rear of the golf club head 400 may generally not be strong enough to support the vibrations and movements of the high-density weighting member 432 experienced when the golf club head 400 impacts a golf ball. To address this problem, the present invention includes an internal ribbon support member 434 that is slightly thickened as a whole to further enhance the structural rigidity of the golf club head 400 around the portion of the weighting member 432. In the present invention, this is achieved by installing the internal ribbon support member 434 around the internal ribbon portion of the lightweight shell 436, thereby realizing a more robust structure to which the high-density weighting member 432 and the weight cover 430 are attached.

[0030] Second, in addition to providing additional structural rigidity to the lightweight shell 436 in relation to weight retention as described above, the internal ribbon support member 434 further has many advantages in assisting the overall golf club head 400 to stay together by supporting the entire rear body portion 404. Increasing the overall structural rigidity of the rear body portion 404 is as important as, but not more important than, the weight retention function of the internal ribbon support member 434. The lightweight shell 436 is generally manufactured from a fiber-reinforced polymer as previously described. First, fiber-reinforced polymer materials cannot be directly bonded to metallic materials without the use of adhesives. Materials bonded with adhesives generally have the potential to be lost if either of the bonded materials vibrates and moves too much. This tends to occur when the fiber-reinforced polymer is subject to high impact forces. This movement of the materials often makes it difficult to bond the titanium front striking face portion 402 to the fiber-reinforced polymer rear body portion 404, thus creating significant design challenges. To address this problem, the internal ribbon support member 434 provides a rigid surface to which the lightweight shell 436 can be bonded around it, thus reducing the vibration of the components and, as a result, enhancing the bond between the front striking face portion 402 and the rear body portion 404, which is often achieved via an adhesive.

[0031] As a supplement, the above-described joint cover 420 also assists in the bond between the front striking face portion 402 and the rear body portion 404 by increasing the structural rigidity of the bond region. The joint cover 420 is made of the same fiber-reinforced polymer in this embodiment, but may be manufactured from any alternative material that can be adhered to the outer surface of the bond region to improve structural rigidity without departing from the scope and content of this invention.

[0032] Thirdly, as a result of the ability to couple to the metallic front impact face portion 402 of the rear body portion 404, the same type of undesirable movement that impedes proper coupling between the front impact face portion 402 and the rear body portion 404 can cause the lightweight shell 436 to fail when subjected to high impact forces. In this invention, an internal ribbon support member 434 is also utilized to assist in addressing the issue of the ability of the lightweight shell 436 made of a thin fiber-reinforced polymer material to withstand the impact forces during the collision of the golf club head 400 with a golf ball. The internal ribbon support member 434 accomplishes this by strengthening the weak areas of the lightweight shell 436 that typically vibrate more than normal during a collision with a golf ball, thereby preventing the lightweight shell 436 made of the fiber-reinforced polymer from cracking or delaminating.

[0033] Fourthly and finally, the addition of the internal ribbon support member 434 improves the acoustics of the golf club head 400. This is because a golf club that is made of a significant portion of purely thin fiber-reinforced polymer can produce undesirable sounds. For a more detailed discussion regarding the sound of the golf club head, including the methodology for testing the sound, refer to the Applicant's U.S. Patent No. 10,653,927 (Murphy et al.). In summary, it can be said that the internal ribbon support member 434 enables the golf club head 400 to achieve desirable acoustic characteristics similar to those of the golf club in U.S. Patent No. 10,653,927. Referring to FIG. 5 of the accompanying drawings, in the current golf club head, the time it takes for the amplitude of the sound to vibrate from peak amplitude A max to an amplitude of 10% of peak amplitude A max is the critical time T criticalis defined as, and this is generally greater than about 0.01 seconds and less than about 0.02 seconds, more preferably greater than about 0.015 seconds and less than about 0.02 seconds, and most preferably greater than about 0.0175 seconds and less than about 0.02 seconds. In addition to the above, the golf club head 400 of this invention may generally have its own resonance frequency greater than 3300 kHz, more preferably greater than 3400 kHz, and most preferably greater than 3500 kHz, mainly by the addition of the internal ribbon support member 434, all of which do not deviate from the scope and content of this invention.

[0034] Here, the internal ribbon support member 434 may further include two recesses 433, and these recesses 433 engage with two or more weight openings 510 to form a space that allows the screw weight 438 to engage with the threaded receptacle 439.

[0035] Finally, the internal ribbon support member 434 may generally have a total mass between about 3.7 grams and about 4.1 grams, more preferably between about 3.8 grams and about 4.0 grams, and most preferably about 3.9 grams in the current embodiment shown. However, it should be noted that the mass of the internal ribbon support member 434 is also important for the proper function of the golf club head 400. The mistake of making the same internal ribbon support member 434 of the golf club head 400 too thin and lightweight may not provide sufficient structural support for the golf club head 400 itself to achieve the desired results.

[0036] Figure 6 of the accompanying drawings shows a cross-sectional view of a golf club head 600 according to an embodiment of the present invention along the cross-section line A-A' shown in Figure 2. This cross-sectional view of the golf club head 600 enables the relationship between various components to be shown more clearly in an assembled state, which sheds more light on the internal structure of the current golf club head 600 of the present invention. Similar to the previous discussion, Figure 6 mainly consists of a front hitting face portion 602 and a rear body portion 604. The front hitting face portion 602 is provided with a threaded receptacle 639. More specifically, since the cross-sectional view shows only the heel side of the golf club head 600, only the heel side threaded receptacle 639b is shown. Attached behind the front hitting face portion 602 is the rear body portion 604, which is mainly made of a lightweight material that is not directly suitable for weight attachment.

[0037] In relation to the weighting mechanism, Figure 6 of the accompanying drawings shows a rear body portion 604 having a heel side weight opening 610b, by which a heel side screw weight 638b can mechanically fix the rear body portion 604 to the front hitting face portion 602. The heel side screw weight 638b and a toe side screw weight 638a (not shown) may be positioned at a distance D2, which is between about 25 mm and about 35 mm behind the face center 603, more preferably between about 27 mm and about 33 mm behind the face center 603, and most preferably between about 28 mm and about 32 mm behind the face center 603. This cross-sectional view of the golf club head 600 shown here also shows a weight member 632, which is sandwiched between an internal weight cover 630 and an internal ribbon support member 634 to assist in its retention. The position of the weighting member 632 may be greater than about 100 mm behind the face center 603, more preferably greater than about 105 mm behind the face center 603, and most preferably arranged at a distance D3 of about 110 mm behind the face center.

[0038] The position and presence of the screw weight 638 and the weight member 632 enable the current golf club head 600 of this invention to have improved center of gravity and moment of inertia characteristics. More specifically, the golf club head 600 may have a CG depth that is greater than about 32 mm, more preferably greater than about 33 mm, and most preferably greater than about 34 mm in the z direction, as shown in FIG. 2. Further, the current golf club head 600 of this invention may have a moment of inertia about the y axis that exceeds about 5,200 g-cm 2 and is more preferably greater than about 5,300 g-cm 2 and most preferably greater than about 5,400 g-cm 2 as shown in FIG. 2. Finally, this cross-sectional view of the golf club head 600 shows the joint cover 620 wrapping around the entire joint between the front hitting face portion 602 and the rear body portion 604, eliminating any step in the transition between the two. Also, the joint cover 620 further includes a sole plate 622 for protecting the underside of the golf club head 600, because the portion of the golf club head 600 is prone to wear when the golf club head 600 is swung.

[0039]

[0040] FIG. 7 of the accompanying drawings shows an enlarged cross-sectional view of the golf club head 700 taken along the section line C-C' of FIG. 3. This enlarged cross-sectional view of the golf club head 700 makes it possible to more clearly show the relationship between the weight opening 710, the screw weight 738, and the threaded receptacle 739. Although this cross-sectional view of the golf club head 700 is taken along the toe-side weight opening 710a, the relationship between the various components is the same with respect to the heel-side weight component (not shown in FIG. 7). That is, although it was previously foreseen that the screw weight 738a could assist in mechanically connecting the rear body portion 704 to the front striking face portion 702, that specific relationship has not been specifically shown until this FIG. 7. In FIG. 7, the toe-side weight opening 710a has an opening within the end of the recess, and the male threaded portion of the toe-side screw weight 738a projects to engage with the female threaded portion of the toe-side threaded receptacle 739a. Alternatively, the diameter of the end opening of the toe-side weight opening 710a is smaller than the head diameter of the toe-side weight 738a, and thus, it can be said to create a mechanical retention. Here, although the toe-side screw weight 738a can be used to further assist in fixing the attachment of the rear body portion 704 to the front striking face portion 702, it should be noted that the screw does not need to provide such a mechanical engagement as shown hereinafter from the subsequent figures.

[0041] Figure 8 of the accompanying drawings shows a cross-sectional view of a golf club head 800 taken across the section line B-B' shown in Figure 2. This cross-sectional view of the golf club head can more clearly show both sets of weights 838a and 838b. The basic components of weights 838a and 838b, threaded receptacles 839a and 839b, and weight openings 810a and 810b have all been discussed previously and are the same in the current embodiment shown in Figure 8. Although the current embodiment of this invention shows two sets of weighting members, it should be noted that three or more sets of weighting members, or even one set of weighting members, can be used without departing from the scope and content of this invention. Further, as shown in the cross-sectional view of the golf club head 800, the heights of the toe-side weighting members 810a, 838a, and 839a are higher than those of the heel-side weighting members 810b, 839b, and 839b along the y-axis (as previously considered in Figure 2). This type of arrangement not only allows the center of gravity of the golf club head 800 to be adjusted in the direction from heel to toe by attaching the threaded weight 838 with mass characteristics, but also allows the center of gravity to be adjusted in the direction from crown to sole due to this change in height. In this specific embodiment of the invention, the toe-side threaded weight 838a is positioned approximately 8 mm higher, more preferably approximately 9 mm higher, and most preferably more than approximately 10 mm higher than the heel-side threaded weight 838b. However, in an alternative embodiment of this invention, the toe weighting members 810a, 838a, and 839a may be lower or the same height as the heel weighting members 810b, 883b, and 839b, and it should be noted that this does not depart from the scope and content of this invention.

[0042] Figure 9 of the accompanying drawings shows an enlarged cross-sectional view of a golf club head 900 according to an alternative embodiment of the present invention. In this alternative embodiment of the present invention, a different screw weighting mechanism is used which does not provide a mechanical lock between the front striking face portion 902 and the rear body portion 904. The golf club head 900 shows that there is no overlap between the head of the screw weight 938a and the inner wall of the weight opening 910a as the screw weight 938a is screwed into the threaded receptacle 939a. Alternatively, it can be said that the end opening of the weight opening 910a may have a diameter larger than the head diameter of the screw weight 938a. This lack of overlap means that the screw weight 938a is attached only to the front striking face portion 902 of the golf club head 900 for the purpose of attaching weight to the golf club head 900, and the connection between the front striking face portion 902 and the rear body portion 904 is achieved only through the joint around the outer peripheral joint in the area covered by the joint cover 920.

[0043] Figures 10, 11, and 12 show a golf club head 1000 according to an alternative embodiment of the present invention. More specifically, FIG. 10 shows the golf club head 1000. FIG. 10 shows a sole view of the golf club head 1000, FIG. 11 shows an exploded perspective view of the golf club head 1000, and FIG. 12 shows a cross-sectional view of the golf club head 1000. Considering all three of these figures together, in this embodiment of the present invention, it can be seen that the position of the weight opening 1010 is located near the rear central portion of the golf club head 1000. The rear body portion 1004 of the golf club head 1000 is adapted to accommodate the weighting system discussed previously. This embodiment of the present invention may be preferred when there is no need for heel-to-toe weighting adjustment and the emphasis is placed on moving the center of gravity rearward in the golf club head 1000. The exploded view of the golf club head 1000 is shown again in FIG. 11, which shows that the internal ribbon support member 1034 is positioned in the rear body portion 1004 of the golf club head 1000, which, as previously discussed, has already been shown to provide an important benefit to the present invention. In addition to this, FIG. 11 also shows the internal components of the screw weight 1038 that engages with the threaded receptacle 1039. However, in this embodiment, instead of being held in place by the internal ribbon support member 1034, the weighting member 1032 may be held via the screw weight 1038 as shown in FIG. 11, as shown in the previous embodiment.

[0044] FIG. 12 shows a cross-sectional view of the golf club head 1000 taken along the section line A-A' shown in FIG. 2, and FIGS. 12 and 10 enable a clearer explanation of the newly introduced weighting mechanism. In FIG. 12, it can be seen that the screw weight 1038 assists in holding the weighting member 1032 near the rear of the golf club head 1000 without actually being attached to the rear body portion 1004. Finally, in this embodiment of the invention, the screw weight 1038 is disposed behind the golf club head 1000, and the screw weight 1038 does not assist in mechanically fixing the rear body portion 1004 to the front striking face portion 1002 as some of the initial embodiments show.

[0045] Here, FIGS. 10, 11, and 12 show a golf club head having a weighting system with one weight opening 1010 disposed behind the golf club head 1000, and two or more weighting systems may be disposed behind the golf club head without departing from the scope and content of the invention as shown in FIG. 3 of the accompanying drawings. FIG. 13 of the accompanying drawings shows a sole view of a golf club head 1300 having a heel side weight opening 1310a and a toe side weight opening 1310b into which two weighting systems can be incorporated, because these weighting configurations may be desirable in certain situations.

[0046] FIGS. 14 through 16 show a golf club head 1400 according to another alternative embodiment of the invention, which utilizes a different weighting mechanism that is not directly connected to the front striking face portion.

[0047] Figure 14 of the accompanying drawings shows a heel side view of a golf club head 1400 according to an alternative embodiment of the present invention. The golf club head 1400, like the previous embodiments, all includes a front striking face portion 1402 and a rear body portion 1406. The rear body portion 1406 in this embodiment is slightly different from the previous embodiments in that it uses a plurality of pieces to form a lightweight shell 1436 and also includes a slightly different weighting system 1440. Details of this weighting system will be discussed later.

[0048] The lightweight shell 1436 in this embodiment may be formed from two different pieces, a lightweight crown sub-shell 1436a and a lightweight sole sub-shell 1436b, which are both combined to form the lightweight shell 1436. Generally, these sub-components may be formed independently of each other and, after being formed, may be joined as separate individual parts. Note that since the entire lightweight shell is generally made from a fiber-reinforced polymer, the lightweight crown sub-shell 1436a and the lightweight sole sub-shell 1436b may also generally be formed from the same fiber-reinforced polymer. However, in alternative embodiments of the present invention, the lightweight crown sub-shell 1436a and the lightweight sole shell 1436b may each be made from different fiber-reinforced polymers, only one of the components may be made from a fiber-reinforced polymer, or both may be made from alternative lightweight materials that are not all fiber-reinforced polymers without departing from the scope and content of the present invention. Combining the lightweight crown sub-shell 1436a and the lightweight sole sub-shell 1436b to form the lightweight shell 1436 itself may be preferred because these substantially flat sub-components are easy to manufacture. However, when a plurality of sub-component parts are joined together to form the lightweight shell 1436, the structural integrity of the rear body portion 1406 may be compromised, and thus an internal ribbon support member (not shown in FIG. 14) becomes even more important in this invention. To show the relationships between the various components according to a further alternative embodiment of the present invention, FIG. 15 is described below.

[0049] Figure 15 of the accompanying drawings shows an exploded rear side view of a golf club head 1400 according to another alternative embodiment of the present invention. As previously discussed, in this other alternative embodiment of the present invention, the lightweight shell 1436 is divided into two sub-components, namely a lightweight crown sub-shell 1436a and a lightweight sole sub-shell 1436b, which are attached to each other to form the rear of the rear body portion 1460. The weighting system 1440 is attached to the rear of the rear body portion 1460 by engaging an opening in the lightweight sole sub-shell 1436b. Finally, an important component of the present invention is the internal ribbon support member 1434 shown in the exploded view of the golf club head 1400 in FIG. 15.

[0050] The internal ribbon support member 1434 shown in FIG. 15 is slightly different from the previous ribbon support member 434 shown earlier in FIG. 4 in the following respect. That is, because there is a weighting system 1440 located behind the rear body portion 1406, it does not support the entire skirt portion across the entire lightweight shell 1436. This internal ribbon support member 1434 compensates for the point where the connection is revised behind the rear body portion 1406, which, as shown in FIG. 15, is achieved by creating a secondary wall 1442 in a Y-shaped structure that connects the lightweight crown sub-shell 1436a to the lightweight sole sub-shell 1436b. The secondary wall 1442 compensates for this by providing structural rigidity to the lightweight shell 1436 through the connection between the lightweight crown sub-shell 1436a and the lightweight sole sub-shell 1436b, even though it does not contact the rear skirt portion of the lightweight shell 1436. As shown in this embodiment of the present invention, the secondary wall 1442 may generally have a thickness between about 0.5 mm and about 1.0 mm, more preferably between about 0.6 mm and about 0.9 mm, and most preferably between about 0.7 mm and about 0.8 mm. Although it cannot be seen until a cross-sectional view of the golf club head 1400 is provided in FIG. 16, the secondary wall creates two separate volume chambers within the golf club head 1400.

[0051] Finally, the weighting system 1440 may generally be a weighting system comprising a high-density weight member made of a metallic material attached to a chassis made of a lightweight material. The use of the lightweight material may generally be of the same type of material as the lightweight shell 1436, but alternative materials may be used for the chassis of the weighting system as long as they can be coupled to the remaining portion behind the rear body portion 1406, which does not depart from the scope and content of this invention.

[0052] Here, it should be noted that a significant portion of the weighting system in this embodiment is disposed behind the secondary wall 1442 and constitutes a significant portion of the overall mass of the golf club head 1400. In this current exemplary embodiment, the mass behind and rearward of the secondary wall 1442 may generally be greater than about 30 grams, more preferably greater than about 35 grams, and most preferably greater than about 40 grams. In other words, assuming the overall mass of the golf club head 1400 is about 200 grams, an amount exceeding about 15 percent of the overall mass of the golf club head 1400 is located behind and rearward of the secondary wall 1442, more preferably, an amount exceeding about 17.5 percent of the overall mass of the golf club head 1400 is located behind and rearward of the secondary wall 1442, and an amount exceeding about 20 percent of the overall mass of the golf club head 1400 is located behind and rearward of the secondary wall 1442.

[0053] To better understand the two separate volume chambers created by the secondary wall 1442 and the internal operation of the weighting system 1440, a cross-sectional view of the golf club head 1400 according to this other alternative embodiment is provided in FIG. 16. FIG. 16 of the accompanying drawings shows a cross-sectional view of the golf club head 1400 along the cross-section line A-A' shown in FIG. 2. In the cross-sectional view of the golf club head 1400 shown in FIG. 16, it can be seen that the secondary wall 1442 separates the golf club head 1400 into two separate volume chambers, a front volume chamber 1446 and a rear volume chamber 1444. Since the secondary wall 1442 is located near the rear of the golf club head 1400, the front volume measurement chamber may generally have a volume between about 380 cc and about 420 cc, more preferably between about 390 cc and about 410 cc, and most preferably about 400 cc. Considering that the overall size of a driver-type golf club head has an overall internal volume of about 460 cc, it can also be said that the front volume chamber has between about 82% and about 91% of the overall internal volume, preferably between about 84% and about 89% of the overall internal volume, and most preferably about 87% of the overall internal volume. Conversely, the rear volume chamber 1444 is created on the opposite side of the secondary wall 1442. In the illustrated embodiment, due to the presence of the track-based weighting system 1440, the rear volume chamber has between about 22 cc and about 30 cc, more preferably between about 24 cc and about 28 cc, and most preferably about 26 cc. In this embodiment, the rear volume chamber has between about 4.7% and about 6.5% of the overall internal volume, more preferably between about 5.2% and about 6.0% of the overall internal volume, and most preferably about 5.6% of the overall internal volume. However, it should be noted that in alternative embodiments of this invention, the rear volume chamber 1444 may have a simple screw weighting system or no weighting system at all without departing from the scope and content of this invention.In those alternative embodiments, the rear volume chamber portion 1444 may have a complementary volume of from about 40 cc to about 80 cc, more preferably from about 50 cc to about 70 cc, and most preferably about 60 cc, resulting in a percentage between about 9% and about 18% of the overall internal volume, more preferably between about 11% and about 16%, and most preferably about 13%, which does not depart from the scope and content of this invention.

[0054] Based on the numbers and percentages outlined above, the golf club head 1400 may have a volume ratio between about 12.6 and about 19.1, more preferably between about 13.9 and about 17.1, and most preferably about 15.4, which does not depart from the scope and content of this invention. Here, the volume ratio is defined by the following formula (1). Volume ratio = (Volume of the front volume chamber portion) / (Volume of the rear volume chamber portion) Formula (1)

[0055] As a result of the volume measurement clearly defined previously, the position of the secondary wall 1442 may also be defined as a measurement from the rearmost point of the golf club head 1400. In the current exemplary embodiment of this invention, the secondary wall is angled at an angle α of from about 8 degrees to about 12 degrees, more preferably from about 9 degrees to about 11 degrees, and most preferably about 10 degrees, as measured from a horizontal ground. As a result, the upper end of the secondary wall 1442 is located between about 20 mm and about 26 mm from the rearmost part of the golf club head 1400, more preferably between about 21 mm and about 25 mm from the rearmost part of the golf club head 1400, and most preferably at a distance D3 of about 23 mm from the rearmost part of the golf club head 1400. The lower end of the secondary wall 1442 is located between about 28 mm and about 34 mm from the rearmost part of the golf club head 1400, more preferably between about 29 mm and about 33 mm from the rearmost part of the golf club head 1400, and most preferably at a distance D4 of about 31 mm from the rearmost part of the golf club head 1400. If the angle α is positive, the upper end of the secondary wall 1442 is always located closer to the rearmost point of the golf club head 1400. It should be noted that in an alternative embodiment, the angle α may be a negative number. In this case, the lower end of the secondary wall 1442 is near the rearmost point of the golf club head 1400. The secondary wall 1442 is disposed closer to the rearmost part of the golf club head 1400 without departing from the scope and content of this invention. This also does not depart from the scope and content of this invention. And regardless of whether the angle α is positive or negative, no part of the secondary wall 1442 is located within 26 mm from the rearmost part of the golf club head 1400, more preferably no part of the secondary wall 1442 is located within 25 mm from the rearmost part of the golf club head 1400, and most preferably no part of the secondary wall 1442 is located within 23 mm from the rearmost part of the golf club head 1400.

[0056] Finally, the cross-sectional view of the golf club head 1400 shown in FIG. 16 shows a track type weighting system 1440. Details regarding this type of track type weighting system 1440 can be found in the applicant's U.S. Patent No. 10,695,628 (Yi et al.), the disclosure of which is hereby incorporated by reference in its entirety.

[0057] FIGS. 17 and 18 of the accompanying drawings show exploded cross-sectional views of a golf club head 1700 according to another alternative embodiment of the present invention. In another alternative embodiment of the present invention, all elements are the same as in the previous embodiments shown, except that the secondary wall 1643 of the internal ribbon support member 1734 may include an opening 1743 that allows adjustment of the acoustic characteristics of the golf club head 1700. The opening 1743 can assist in controlling the acoustic characteristics of the golf club head 17000 by allowing vibrational energy to move between the front volume chamber portion 1746 and the rear volume chamber portion 1744, thereby reducing unwanted vibrations that cause bad sounds.

[0058] Except for the opening 1743 in the secondary wall 1643 of the internal ribbon support member 1734, the remaining components of the golf club head 1700 are essentially the same. The golf club head 1700 still consists of a striking face portion 1702 and a rear body portion 1706. The lightweight shell 1736 in this embodiment may be further divided into a lightweight crown sub-shell 1736a and a lightweight sole sub-shell 1736b, and the weighting system 1740 is still attached to the rear of the rear body portion 1706.

[0059] FIG. 19 of the accompanying drawings shows an exploded perspective view of a golf club head 1900 according to another alternative embodiment of the present invention, in which the internal ribbon support member 1934 has additional features that assist in improving the performance of the golf club head 1900 itself. More specifically, only the outer surface (outer component) 1950, rather than the internal components 1952 of the internal ribbon support member 1934, includes additional features of a plurality of notches 1954 for creating a lattice structure. The lattice structure in the current exemplary embodiment of the present invention can further increase the structural rigidity of the internal ribbon support member 1934, and thus the lightweight shell 1936 can be made thinner and lighter. In this alternative embodiment of the present invention, the internal ribbon support member may have a mass of less than about 7.0 grams, more than about 6.0 grams, and most preferably less than about 5.0 grams. All other components of the golf club head 1900, such as the front hitting face portion 1902, the rear body portion 1904, the lightweight shell 1936, and the weighting system 1940, remain essentially the same except that the internal ribbon support member 1934 is different.

[0060] To show more details regarding the plurality of notches 1954 on the outer component 1950 of the internal ribbon support member 1934, an enlarged perspective view of the internal ribbon support member 1934 is shown in FIG. 20. In the enlarged perspective view of the internal ribbon support member 1934 from different viewpoints shown in FIG. 20, the difference between the outer component 1950 and the internal component 1952 can be shown more clearly. In this FIG. 20, it can be seen that the plurality of notches 1954 are only on the outer component 1950 and are substantially triangular in shape. The pattern of the plurality of notches alternates longitudinally along the internal ribbon support member 1934 and creates the above-described lattice structure that is not a mirror image of each other above and below the midpoint of the hemisphere. In an alternative embodiment of the present invention, it should be noted that different notch shapes can be used to form a plurality of notches 1954 such as squares, rectangles, ellipses, circles, or any other shape, all of which do not depart from the scope and content of the present invention.

[0061] FIG. 20 of the accompanying drawings shows a plurality of notches 1954 along the outer component 1950 of the internal ribbon support member 1934, and also shows how the outer component 1950 and the inner component 1952 of the internal ribbon support member 1934 are combined to form a diamond-shaped support member. These types of shapes tend to further increase the structural rigidity of the internal ribbon support member 1934 and maximize the strength-to-weight ratio of the internal ribbon support member 1934, and thus would generally be preferred in engineering design.

[0062] FIGS. 21 and 22 of the accompanying drawings show an exploded view of a golf club head 2100 and an enlarged perspective view of an internal ribbon support member 2134, respectively, to illustrate other alternative embodiments of this invention. In this alternative embodiment of the invention, the golf club head 2100 still comprises a striking face portion 2102 and a rear body portion 2104. The rear body portion 2104 is further composed of a lightweight shell 2136 and an internal ribbon support member 2134. However, upon closer examination of the inner component 2152 of the internal ribbon support member 2134, it will be noted that the inner component 2152 of the internal ribbon support member 2134 also has a plurality of notches 2154, which will highlight the unique feature of this embodiment. These notches 2154 assist in further reducing the mass of the internal ribbon support member. Alternatively, it can be said that both the inner component 2152 and the outer component 2150 of the internal ribbon support member 2134 are further composed of a plurality of notches 2154. Since additional mass is removed from the inner component 2152 of the internal ribbon support member 2134, the internal ribbon support member 2134 according to this embodiment of the invention may have a total mass of less than about 4.0 grams, more preferably less than about 3.9 grams, and most preferably less than about 3.8 grams.

[0063] Figures 23 and 24 of the accompanying drawings respectively show an exploded view of a golf club head 2300 and a perspective view of an internal ribbon support member 2334 to illustrate other alternative embodiments of this invention. In this alternative embodiment of the invention, the golf club head 2300 still comprises a striking face portion 2302 and a rear body portion 2304. The rear body portion 2304 is further composed of a lightweight shell 2336 and an internal ribbon support member 2334. However, in this embodiment, the internal ribbon support member 2334 has only external components 2350 and completely removes the internal components shown in the previous embodiment. This embodiment may be desirable when dramatic weight reduction is desired, but it comes at the expense of a reduction in structural rigidity support. In this embodiment of the invention, the internal ribbon support member 2334 may have a total mass of less than about 2.8 grams, more preferably less than about 2.7 grams, and most preferably less than about 2.6 grams.

[0064] Except for the operating examples, or unless otherwise specified, all numerical ranges, amounts, values and percentages such as the amount of materials, moment of inertia, center of gravity position, loft, draft angle, various performance ratios, and others in the previous part of this specification should be understood as if the term "about" were prefixed thereto even if the term "about" does not explicitly appear in the value, amount, or range. Therefore, unless otherwise indicated, the numerical parameters described in the above specification and the appended claims are approximate values that may vary depending on the desired characteristics required to be obtained by this invention. At least, without attempting to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should be interpreted by applying ordinary rounding techniques in light of at least the reported significant digits.

[0065] Numerical ranges and parameters which set forth the broad scope of this invention are approximations, although specific numerical values are reported in specific examples as accurately as possible. However, each numerical value inherently contains certain errors resulting from the standard deviation found in its respective testing measurements. Further, when numerical ranges of various values are set forth herein, it should be noted that any combination of these values, including the recited values, may be utilized.

[0066] Of course, the foregoing description relates to exemplary embodiments of the invention and it is to be understood that modifications may be made without departing from the spirit and scope of the invention as set forth in the following claims. The following lists the technical features described herein. [Technical Feature 1] In a golf club head, a front hitting face portion located at the front of the golf club head, and a rear body portion attached to the rear of the hitting face portion, and the rear body portion further includes a lightweight shell, and an internal ribbon support member attached to the inner surface of the lightweight shell around the skirt of the lightweight shell, and the internal ribbon support member further includes a plurality of notches, and the internal ribbon support member has a mass of less than about 7.0 grams, a golf club head characterized thereby. [Technical Feature 2] The golf club head according to Technical Feature 1, wherein the internal ribbon support member has a mass of less than about 6.0 grams. [Technical Feature 3] The golf club head according to Technical Feature 2, wherein the internal ribbon support member has a mass of less than about 5.0 grams. [Technical Feature 4] The golf club head according to Technical Feature 3, wherein the internal ribbon support member further has internal components and external components, and the plurality of notches are exclusively arranged in the external components. [Technical Feature 5] The golf club head according to Technical Feature 1, wherein the internal ribbon support member further has an internal component and an external component, and the plurality of notches are disposed on both the internal component and the external component. [Technical Feature 6] The golf club head according to Technical Feature 5, wherein the internal ribbon support member has a mass of less than about 4.0 grams. [Technical Feature 7] The golf club head according to Technical Feature 6, wherein the internal ribbon support member has a mass of less than about 3.9 grams. [Technical Feature 8] The golf club head according to Technical Feature 7, wherein the internal ribbon support member has a mass of less than about 3.8 grams. [Technical Feature 9] The golf club head according to Technical Feature 1, wherein the internal ribbon support member further has an external component, and the plurality of notches are disposed on the external component. [Technical Feature 10] The golf club head according to Technical Feature 9, wherein the internal ribbon support member has a mass of less than about 2.8 grams. [Technical Feature 11] The golf club head according to Technical Feature 10, wherein the internal ribbon support member has a mass of less than about 2.7 grams. [Technical Feature 12] The golf club head according to Technical Feature 11, wherein the internal ribbon support member has a mass of less than about 2.6 grams. [Technical Feature 13] In a golf club head, a front hitting face portion located at a front portion of the golf club head, and a rear body portion attached to a rear portion of the hitting face portion, wherein the rear body portion further includes a lightweight shell, and an internal ribbon support member attached to an inner surface of the lightweight shell around a skirt of the lightweight shell. The internal ribbon support member further has a secondary wall that separates the entire internal volume of the golf club head into a front volume chamber portion and a rear volume chamber portion. The golf club head has a volume ratio between about 12.6 and about 19.1. The above volume ratio is Volume ratio = (Volume of the front volume chamber portion) / (Volume of the rear volume chamber portion) A golf club head characterized by being defined by. [Technical Feature 14] The golf club head according to Technical Feature 13, wherein the volume ratio is between about 13.9 and about 17.1. [Technical Feature 15] The golf club head according to Technical Feature 13, wherein the volume ratio is about 15.4. [Technical Feature 16] The golf club head according to Technical Feature 13, wherein the front striking face portion is made of a titanium material. [Technical Feature 17] The lightweight shell further has a lightweight crown sub - shell and a lightweight sole sub - shell, The golf club head according to Technical Feature 16, wherein the lightweight crown sub - shell and the lightweight sole sub - shell are formed independently of each other. [Technical Feature 18] The golf club head according to Technical Feature 17, wherein the entire lightweight shell and the internal ribbon support member are made of a fiber - reinforced polymer. [Technical Feature 19] The golf club head according to Technical Feature 17, wherein only the lightweight crown sub - shell is made of a fiber - reinforced polymer. [Technical Feature 20] The golf club head generates a sound having a critical time T greater than about 0.01 seconds and less than about 0.02 seconds. The critical time T critical is such that the sound has a peak amplitude A critical to the peak amplitude A max from the peak amplitude A maxThe golf club head according to technical feature 17 defined as the time taken to swing to the 10% point of [Technical feature 21] The critical time T critical is greater than about 0.015 seconds and less than about 0.02 seconds, as described in technical feature 20 of the golf club head. [Technical feature 22] The critical time T critical is greater than about 0.0175 seconds and less than about 0.02 seconds, as described in technical feature 20 of the golf club head. [Technical feature 23] In a golf club head, a front striking face portion having one or more threaded receptacles, and a rear body portion attached to the rear of the front striking face portion, The rear body portion further includes a lightweight shell having one or more weight openings, an internal ribbon support member attached to the inner surface of the lightweight shell around the skirt of the lightweight shell, and one or more screw weights inserted through the one or more weight openings for engaging with the one or more threaded receptacles, wherein both the lightweight shell and the internal ribbon support member are manufactured from a fiber-reinforced polymer, characterized by the golf club head. [Technical feature 24] The golf club head according to technical feature 23, wherein the front striking face portion is manufactured from a titanium material. [Technical feature 25] The golf club head according to technical feature 24, wherein the internal ribbon support member further has one or more recesses that engage with the one or more weight openings so that the one or more screw weights can engage with the one or more threaded receptacles. [Technical feature 26] The golf club head has a critical time T greater than about 0.01 seconds and less than about 0.02 seconds criticalgenerates a sound having a critical time T critical wherein the critical time T max is defined as the time it takes for the sound to swing from the peak amplitude A max to the 10% point of the peak amplitude A, according to the golf club head of technical feature 23 [Technical Feature 27] wherein the critical time T critical is greater than about 0.015 seconds and less than about 0.02 seconds, according to the golf club head of technical feature 26 [Technical Feature 28] wherein the critical time T critical is greater than about 0.0175 seconds and less than about 0.02 seconds, according to the golf club head of technical feature 27 [Technical Feature 29] further comprising a weighting member disposed on an inner rear skirt portion of the rear body portion, according to the golf club head of technical feature 23 [Technical Feature 30] wherein the weighting member is attached to an inner surface of the inner ribbon support member of the rear body portion, and the inner ribbon support member separates the weighting member from the lightweight shell, according to the golf club head of technical feature 29 [Technical Feature 31] further comprising an internal weight cover that engages both an inner surface of the weight member and an inner surface of the inner ribbon support member, according to the golf club head of technical feature 30 [Technical Feature 32] wherein the rear body portion is mechanically fixed to the front striking face portion via the one or more nedivates, according to the golf club head of technical feature 23 [Technical Feature 33] wherein an end of the weight opening engages a head of the nedivate to mechanically fix the rear body portion to the front striking face portion, according to the golf club head of technical feature 32 [Technical Feature 34] The golf club head according to technical feature 23, wherein the rear body portion is non - mechanically fixed to the front striking face portion by the one or more screw weights. [Technical feature 35] The golf club head according to technical feature 34, wherein the end of the weight opening has an opening with a diameter larger than the head diameter of the screw weight.

Explanation of reference signs

[0067] 100 Golf club head 101 Striking face insert 102 Front striking face portion 104 Rear body portion 200 Golf club head 201 Face insert 202 Front striking face portion 203 Face center 205 Coordinate system 300 Golf club head 302 Front striking face portion 304 Rear body portion 310 Weight opening 310a Toe - side weight opening 310b Heel - side weight opening 320 Joint cover 322 Sole plate 400 Golf club head 402 Front striking face portion 402 2) Front striking face portion 404 Rear body portion 410 Weight opening 410b Heel - side weight opening 420 Joint cover 422 Sole plate 430 Inner weight cover 430 Weight cover 432 Member 433 Recess 434 Inner ribbon support member 434 Ribbon support member 436 Lightweight shell 438 Weight 438 Screw weight 438a Toe side weight 438b Heel side weight 439 Grooved receptacle 439a Toe side grooved receptacle 439b Heel side grooved receptacle 510 Weight opening 600 Golf club head 602 Front hitting face portion 603 Face center 604 Rear body portion 610b Heel side weight opening 620 Joint cover 622 Sole plate 630 Inner weight cover 632 Weight member 632 Member 634 Inner ribbon support member 638 Screw weight 638a Toe side weight 638b Heel side screw weight 639 Grooved receptacle 639b Heel side grooved receptacle 700 Golf club head 702 Front hitting face portion 704 Rear body portion 710 Weight opening 710a Toe side weight opening 738 Screw weight 738a Toe side screw weight 739 Grooved receptacle 739a Toe side grooved receptacle 800 Golf club head 810a Toe side weight opening 810b Heel side weight opening 838 Screw weight 838a Toe-side screw weight 838b Heel-side screw weight 839a Grooved receptacle 900 Golf club head 902 Front hitting face portion 904 Rear body portion 910a Weight opening 920 Joint cover 938a Toe-side screw weight 939a Toe-side grooved receptacle 1000 Golf club head 1002 Front hitting face portion 1004 Rear body portion 1010 Weight opening 1032 Weighting member 1034 Internal ribbon support member 1038 Screw weight 1039 Grooved receptacle 1300 Golf club head 1310a Heel-side weight opening 1310b Toe-side weight opening 1400 Golf club head 1402 Front hitting face portion 1406 Rear body portion 1434 Internal ribbon support member 1436 Lightweight shell 1436a Lightweight crown sub-shell 1436b Lightweight sole sub-shell 1440 Weighting system 1442 Secondary wall 1444 Rear volume chamber portion 1446 Front volume chamber portion 1460 Rear body portion 1643 Secondary wall 1700 Golf club head 1702 Hitting face portion 1706 Rear body portion 1734 Internal ribbon support member 1736 lightweight shell 1736a lightweight crown sub - shell 1736b lightweight sole sub - shell 1740 weighting system 1743 opening 1744 rear volume chamber part 1746 front volume chamber part 1900 golf club head 1902 front hitting face part 1904 rear body part 1934 internal ribbon support member 1936 lightweight shell 1940 weighting system 1950 external component 1952 internal component 1954 notch 2100 golf club head 2102 hitting face part 2104 rear body part 2134 internal ribbon support member 2136 lightweight shell 2150 external component 2152 internal component 2154 notch 2300 golf club head 2302 hitting face part 2304 rear body part 2334 internal ribbon support member 2336 lightweight shell 2350 external component 17000 golf club head

Claims

1. In the golf club head, a front striking face portion located at a front portion of the golf club head; a rear body portion attached to a rear portion of the front striking face portion; The rear body portion further comprises: A lightweight shell and an internal ribbon support member attached to an inner surface of the lightweight shell about a skirt of the lightweight shell; the internal ribbon support member further includes a secondary wall separating an internal overall volume of the golf club head into a front volume chamber and a rear volume chamber; the golf club head has a volume ratio between 12.6 and 19.1; The above volume ratio is Volume ratio = (volume of front volume chamber) / (volume of rear volume chamber) 1. A golf club head as defined by the following:

2. The golf club head of claim 1 , wherein the volume ratio is between 13.9 and 17.

1.

3. The golf club head of claim 1 , wherein the volume ratio is 15.

4.

4. 2. The golf club head of claim 1, wherein said front striking face portion is manufactured from a titanium material.

5. The lightweight shell further comprises: Lightweight crown subshell and A lightweight sole subshell is provided. The golf club head of claim 4 , wherein the lightweight crown sub-shell and the lightweight sole sub-shell are formed independently of each other.

6. 6. The golf club head of claim 5, wherein both said lightweight shell and said internal ribbon support member are fabricated entirely from a fiber reinforced polymer.

7. 6. The golf club head of claim 5, wherein only said lightweight crown subshell is fabricated from a fiber reinforced polymer.

8. The golf club head is rotated within a critical time T that is greater than 0.01 seconds and less than 0.02 seconds. ｃｒｉｔｉｃａｌ and generating a sound having a critical time T ｃｒｉｔｉｃａｌ is the peak amplitude A of the sound ｍａｘ from the peak amplitude A ｍａｘ 6. The golf club head of claim 5, wherein the time it takes for the club head to swing to a 10% point of the swing.

9. The critical time T ｃｒｉｔｉｃａｌ 9. The golf club head of claim 8, wherein is greater than 0.015 seconds and less than 0.02 seconds.

10. The critical time T ｃｒｉｔｉｃａｌ 9. The golf club head of claim 8, wherein is greater than 0.0175 seconds and less than 0.02 seconds.

Images