Golf club head with adjustable weight

Abstract

To provide an improved weighting system that seamlessly fits the traditional shaping of a wedge type golf club head to preserve the aesthetics of the golf club head expected by a golfer.SOLUTION: A golf club head comprises a body portion and a weight assembly. The body portion further comprises: a striking face defining a striking face plane and having a lower edge; a sole extending rearward from the lower edge; a back portion positioned rearward of the striking face and coupled to a rearward portion of the sole; and a rear cavity formed near the sole of the body portion. The weight assembly further comprises a cover adapted to completely cover the rear cavity. When a weight is installed in at least one of an internal heel receptacle and an internal toe receptacle and the cover is fully secured to the rear cavity using the fastener, the cover completely conceals the weight from view.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This invention generally relates to an improved adjustable weighting system for iron and / or wedge type golf club heads. More specifically, the golf club head according to this invention relates to an improved weighting system that imparts reliability while seamlessly conforming to the traditional shape of a wedge type golf club head while maintaining the beauty of the golf club head desired by the golfer.

Background Art

[0002] In the game of golf, each golfer's swing is slightly different from the next swing. Therefore, what is optimal for one golfer is not necessarily optimal for another golfer. In one example, a golfer may need a golf club that provides a lot of forgiveness, while another golfer may need a golf club that provides more accuracy. In the golf equipment industry, traditionally, various types and models of golf clubs have been provided to meet the various needs of different golfers.

[0003] With the continuous development of innovations in golf club technology, golf club designers have been able to incorporate adjustment functions into golf club heads in order to meet the various needs of golfers. U.S. Patent No. 8,088,019 (Long et al.) shows an example of adding an adjustable hosel mechanism to a golf club head so that the loft, lie, and face angle of the golf club head can be adjusted according to the needs of the golfer.

[0004] In addition to adjustable hosel technology, U.S. Patent No. 7,410,425 (Willett et al.) shows that the weighting of a golf club head can also be adjusted via one or more weighting screws of different densities, changing the center of gravity of the golf club head and providing different ball flight characteristics to the golfer according to the needs of the golfer.

[0005] U.S. Patent No. 8,696,491 (Myers) provides an alternative method for providing adjustability to metalwood golf club heads via a track weighting system instead of multiple individual weights, allowing a single weight to move along the track of the golf club head while also manipulating the center of gravity and the performance of the golf club head.

[0006] The use of adjustable weighting can be applied not only to metalwood-type golf club heads as shown above, but also to iron-type situations to achieve a similar purpose. U.S. Patent No. 6,015,354 (Ahn et al.) shows one of the earliest attempts to adjust the weight of an iron-type golf club head using various highly visual types of adjustments. Maintaining aesthetic appeal is a very important feature in golf club design, as it often contributes to the golfer's confidence.

[0007] U.S. Patent No. 8,777,774 (Kim et al.) offers a more modern attempt to adjust the weight of a golf club head, but this time it maintains the overall appearance of the golf club head.

[0008] All of the exemplary advancements described above in the performance of golf club heads are highly effective in adjusting the weight and center of gravity of the golf club head. However, despite all of the aforementioned advancements, there has been no reference material that achieves a truly elegant way to provide weight adjustment, and consequently the adjustment of the center of gravity of the golf club head, while maintaining the shape and appearance of the conventional golf club head. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] U.S. Patent No. 8,088,019 [Patent Document 2] U.S. Patent No. 7,410,425 [Patent Document 3] U.S. Patent No. 8,696,491 [Patent Document 4] U.S. Patent No. 6,015,354 [Patent Document 5] Domestic Specification No. 8,777,774 [Overview of the project]

[0010] In one aspect, the technology described herein relates to a golf club head, the golf club head comprising a body portion and a weight assembly, the body portion further comprising a striking face having a lower edge forming a striking face plane, a sole extending rearward from the lower edge, a rear portion positioned behind the striking face and coupled with the rear portion of the sole, and a rear cavity formed in the vicinity of the sole of the body portion, the weight assembly further comprising a cover adapted to completely cover the rear cavity, and further comprising an internal heel receptacle and an internal toe receptacle The device includes a cover having a through hole separating the internal heel receptacle and the internal toe receptacle, a weight adapted to engage with at least a portion of at least one of the internal heel receptacle or the internal toe receptacle, and a fastener adapted to engage with the through hole and attach the cover to the body portion, wherein the cover completely conceals the weight when the weight is attached to at least one of the internal heel receptacle or the internal toe receptacle and the cover is fully attached to the rear cavity using the fastener.

[0011] In other respects, the technology described herein relates to a golf club head, the golf club head comprising a body portion and a weight assembly, the body portion further comprising a striking face having a lower edge forming a striking face plane, a sole extending rearward from the lower edge, a rear portion positioned behind the striking face and coupled with the rear portion of the sole, and a rear cavity formed in the vicinity of the sole of the body portion, the weight assembly further comprising a cover adapted to completely cover the rear cavity. Furthermore, the device includes an internal heel receptacle, an internal toe receptacle, a cover having a through hole separating the internal heel receptacle and the internal toe receptacle, a weight adapted to engage with at least a portion of either the internal heel receptacle or the internal toe receptacle, and a fastener adapted to engage with the through hole to attach the cover to the body portion, wherein the fastener moves along the weight axis, and the weight axis forms an angle α with the striking face plane between approximately -10 degrees and approximately +10 degrees.

[0012] In other respects, the technology described herein relates to a golf club head, the golf club head comprising a body portion and a weight assembly, the body portion further comprising a striking face having a lower edge forming a striking face plane, a sole extending rearward from the lower edge, a rear portion positioned behind the striking face and coupled with the rear portion of the sole, and a rear cavity formed in the vicinity of the sole of the body portion, the weight assembly further comprising a cover adapted to completely cover the rear cavity. Furthermore, the golf club head includes an internal heel receptacle, an internal toe receptacle, a cover having a through hole separating the internal heel receptacle and the internal toe receptacle, a weight adapted to engage with at least a portion of either the internal heel receptacle or the internal toe receptacle, and a fastener adapted to engage with the through hole to attach the cover to the main body portion, wherein the weight assembly is capable of a delta change (Δx) along the x-axis between approximately 0 mm and approximately 2.5 mm.

[0013] 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]

[0014] 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.

[0015] [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 accompanying drawings shows an internal perspective view of a weight assembly according to an embodiment of the present invention. [Figure 4] Figure 4 of the accompanying drawings shows another internal perspective view of a weight assembly according to another alternative embodiment of the present invention. [Figure 5] Figure 5 of the accompanying drawings shows a front view of a golf club head according to an embodiment of the present invention. [Figure 6] Figure 6 of the accompanying drawings shows an exploded heel side view of a golf club head according to an embodiment of the present invention. [Figure 7] Figure 7 of the accompanying drawings shows a rear view of a golf club head according to an embodiment of the present invention. [Figure 8] Figure 8 of the accompanying drawings shows a cross-sectional view of a golf club head according to an embodiment of the present invention, taken along the sectional line A-A' shown in Figure 5. [Figure 9] Figure 9 of the accompanying drawings shows a cross-sectional view of a golf club head according to an embodiment of the present invention, taken along the sectional line B-B' shown in Figure 5. [Figure 10] Figure 10 of the accompanying drawings shows a cross-sectional view of a golf club head according to an embodiment of the present invention, taken along the sectional line C-C' shown in Figure 5. Detailed Description of the Invention

[0016] The following detailed description describes the currently contemplated best mode for carrying out the invention. This description should not be construed in a limiting sense, as the scope of the invention is best defined by the appended claims, and is made merely for the purpose of explaining the general principles of the invention.

[0017] 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 only some or all of the above problems, or may address only one of the above problems. Furthermore, one or more of the problems described above may not be fully addressed by any of the functions described below.

[0018] Before beginning the discussion of the golf club head of this invention and its performance criteria, it is beneficial to note here that the following discussion is based on the coordinate system 301 (shown in FIG. 3) and the measurement axes, which are important for properly evaluating the performance numerical values. Thus, while the specific names given to the following measurements are important for understanding this 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 coordinate system that is consistent with each other.

[0019] In accordance with the above, for the purpose of establishing a reference coordinate system for the following discussion, FIG. 5 of the accompanying drawings shows the coordinate system 501 used to define various measurement values and performance numerical values of this invention. The x-axis used in the current discussion refers to the axis that is horizontal with respect to the striking face from the heel to the toe direction. The y-axis used in this discussion refers to the vertical axis from the crown to the sole direction through the club. The z-axis used in this 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 a 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 that have 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.

[0020] Figure 1 of the attached drawings shows a perspective view of a golf club head 100 according to one embodiment of the present invention. The golf club head 100 shown in Figure 1 may comprise a body having a striking face 502 (shown in Figure 5), a sole 104 (shown in Figure 5) extending rearward from the lower front edge of the striking face 502, and a back portion 106 positioned behind the striking face 502 and coupled to the rear of the sole 104. The golf club head 100 according to this embodiment of the present invention may have a rear cavity 208 (shown in Figure 2) adapted to accommodate a weight assembly 110. The rear cavity 208 (shown in Figure 2) is generally located within the muscle portion of the golf club head 100 and, in accordance with one of the main objectives of the present invention, creates a seamless and aesthetically pleasing visual appearance.

[0021] Figure 2 of the attached drawings shows an exploded view of a golf club head 200 according to one embodiment of the present invention. In the exploded view of the golf club head 200 shown in Figure 2, the weight assembly 210 has been removed from the rear cavity 208, showing how the various components of the weight assembly 210 are connected to the rear cavity 208. The weight assembly 210 shown herein further comprises a cover 212 having a predetermined shape and size that completely covers the gap formed by the rear cavity 208. The cover comprises an internal heel receptacle 322 (shown in Figure 3) and an internal toe receptacle 324 (shown in Figure 3), separated by a through hole 214, both of which are adapted to accommodate weights 216. When the fastener 218 shown in Figure 2 engages with the threaded receptacle 220 in the rear cavity 208, the entire weight assembly 210, including the weight 216 mounted inside the cover 212, can be secured to the rear cavity 208.

[0022] It is important to note that the weight 216 is attached to either the internal heel receptacle 322 (shown in Figure 3) or the internal toe receptacle 324 (shown in Figure 3) to assist in adjusting the center of gravity of the golf club head 200, and this depends on which receptacle the weight 216 is attached to. In fact, this invention assumes that the weight 216 may not be sized to fill the entire internal heel receptacle 322 (shown in Figure 3) or the internal toe receptacle 324 (shown in Figure 3), and further assumes that the center of gravity of the golf club head 200 can be further adjusted depending on where it is attached within each receptacle.

[0023] The weight 216 shown in this embodiment of the present invention may generally be manufactured from a high-density material having a density greater than about 12 g / cc, more preferably greater than about 14 g / cc, and most preferably greater than about 17 g / cc. In one embodiment, the preferred material for weight 216 may be a tungsten-type material, but in alternative embodiments, various other types of materials may be used without departing from the scope and content of the present invention, as long as they have a higher density than steel.

[0024] A detailed comparison of the fully assembled golf club head 100 shown in Figure 1 and the exploded view of the golf club head 200 shown in Figure 2 illustrates one of the key and important features of this invention: when the cover 212 is fully secured to the rear cavity 208 of the golf club head 200, the cover 212 completely hides the weight 216 from view. This feature is important to the current wedge-type design because, unlike other types of tracking weighting systems that require an indicator to locate their position, wedge-type golf club heads need to be durable against impacts in various turf conditions, including bunkers, unlike other types of golf clubs that do not experience severe impacts from the ground. Therefore, this feature is important to this invention.

[0025] Figure 3 of the attached drawings shows an internal perspective view of a weight assembly 310 according to one embodiment of the present invention. The internal perspective view of the weight assembly 310 allows for a clearer view of the internal heel receptacle 322 and the internal toe receptacle 324. In this embodiment of the present invention shown in Figure 3, as shown in Figure 3, the weight 316 is attached to the internal heel receptacle 322, while the internal toe receptacle 324 is left empty. Attaching the high-density weight 316 to the internal heel receptacle 322 allows the center of gravity of the golf club head to be shifted toward the heel side of the golf club head, while the reverse is true if the weight 316 is attached to the internal toe receptacle 324. Finally, Figure 3 of the attached drawings also shows a fastener 318 that separates the internal heel receptacle 322 from the internal toe receptacle 324, which is adapted to engage with the threaded receptacle 220 (shown in Figure 2) to secure the weight assembly 310 to the golf club head.

[0026] Here, it should be noted that the weight 316 shown in Figure 3 does not need to completely fill the internal heel receptacle 322. That is, in the illustrated embodiment, this is Therefore, the weight 316 cannot completely fill the entire internal heel receptacle 322, but only fills the terminal side of the internal heel receptacle 322, leaving a gap on the proximal side of the internal heel receptacle 322. It should be noted that in alternative embodiments of this invention, without departing from the scope and content of this invention, the weight 316 may occupy many other positions in relation to the internal heel receptacle 322 or the internal toe receptacle 324.

[0027] Figure 4 of the attached drawings shows one of the alternative positions for the weight 416 within the internal toe receptacle 424 instead of the internal heel receptacle 422. In addition to illustrating an embodiment of how the weight can be positioned in a different location within the internal toe receptacle 424, Figure 4 of the attached drawings also shows that the arrangement of the weight within the internal toe receptacle 424 may also be different. In the weight assembly 410 shown in Figure 4, the weight 416 is positioned near the fastener 418 at the proximal end of the internal toe receptacle 424, leaving a gap at the distal end of the internal toe receptacle 424. Needless to say, in yet another embodiment of the present invention, without departing from the scope and content of the present invention, the weight 416 may also be positioned at the proximal end of the internal heel receptacle 422.

[0028] Figure 5 of the attached drawings shows a front view of the golf club head 500, with the striking face 502 visible. In the front view of the golf club head 500 shown in Figure 5, section lines A-A', B-B', and C-C' can be seen, and their details will be described later. Section line A-A' passes through the center of the fastener 218 (shown in Figure 2), and section line B-B' passes through the toe-side plane of section line A-A', which indicates the empty side of the internal toe receptacle, and in this embodiment, it is shown as an empty cavity.

[0029] In addition to showing multiple cross-sectional lines along this xy plane, Figure 5 of the attached drawings also shows the positions of the face center 532 and the center of gravity 534 of the golf club head 500. The face center 532 of the golf club head 500 is defined as the midpoint between the full-length scorelines (partial scorelines are ignored) along the x-axis, and is located on the front striking surface of the striking face 502 on the fifth scoreline from the bottom. The emphasis on the position of the center of gravity in this invention is important because the adjustable weight assembly 210 (shown in Figure 2) adjusts the position of the weights along the x-axis, and therefore the resulting position of the center of gravity along the x-axis changes depending on the position of the weights 216 (shown in Figure 2) within the weight assembly 210 (shown in Figure 2).

[0030] In this embodiment of the invention, the distance d1 of the center of gravity 534 along the x-axis away from the face center 532 may generally be between about 2 mm and about 8 mm, more preferably between about 3 mm and about 7 mm, and most preferably between about 3 mm and about 6 mm. Because the above-described range of center of gravity positions relates to different wedge chassis having different lofts, the entire range of center of gravity distances previously specified is generally not within the adjustable range. In practice, changes in the center of gravity position of the wedge between the ends of the weight arrangement inside the internal heel receptacle 322 (shown in Figure 3) and internal toe receptacle 324 (shown in Figure 3) of the weight assembly 310 (shown in Figure 3) may result in a delta change quantified as Δx between about 0 mm and about 2.5 mm, more preferably between about 0 mm and about 2.0 mm, and most preferably between 0 mm and about 1.8 mm, none of which departs from the scope and content of the invention. In other words, the weight assembly 310 can achieve a delta change (Δx) along the x-axis between approximately 0 mm and approximately 2.5 mm, more preferably between approximately 0 mm and approximately 2.0 mm, and most preferably between 0 mm and approximately 1.8 mm.

[0031] Figure 6 of the attached drawings shows an exploded heel side view of a golf club head 600 according to one embodiment of the present invention. In this exploded view of the golf club head 600, it can be seen that the entire weight assembly 610 moves along the weight axis 636, forming a weight assembly angle α with the loft plane 638 of the golf club head 600. Here, the loft plane 638 shown in Figure 6 is a plane formed along the xz plane shown in coordinate system 601, and is intended to capture the loft of the golf club head 600. The loft plane 638 forms a loft angle θ with the ground plane 640, which is greater than 40 degrees, more preferably about 43 degrees, and most preferably greater than about 45 degrees.

[0032] The weight assembly angle α is important to this invention as it ensures that the weight assembly 610 is strategically positioned within the muscle portion of the golf club head 600. In the current exemplary embodiment of this invention, the weight assembly angle α may generally be between -10 and +10 degrees of the loft plane 638, more preferably between -5 and +10 degrees of the loft plane 638, and most preferably between approximately 0 and +10 degrees of the loft plane 638. Although the weight assembly angle α is shown as a positive number in the embodiment shown in Figure 6, α may be a negative number as described above without departing from the scope and content of this invention.

[0033] In addition to showing the two angles described above, an exploded heel side view of the golf club head 600 can provide a more detailed view of the cover 612, weights 616, and fastener 618 of the weight assembly 610. In this particular embodiment of the invention, the fastener 318 may be a double-start thread that facilitates partial removal to facilitate turning over the cover 612 of the weight assembly 610, without departing from the scope and content of the invention. In this embodiment of the invention, the coarse thread portion of the double-start fastener 618 forms the first 4 mm portion of the thread, allowing the first 4 mm of the release process to be performed quickly, while the remaining portion of the thread may have a finer composition to prevent accidental removal of the entire cover 612, without departing from the scope and content of the invention.

[0034] Figure 7 of the attached drawings shows a rear view of a golf club head 700 according to one embodiment of the present invention. In this aspect of the present invention shown in Figure 7, it can be seen again that when fully installed, the cover 712 of the weight assembly 710 is sized and shaped to have the same size and dimensions as the rear cavity 208 (shown in Figure 2), and the rear cavity 208 (shown in Figure 2) is completely concealed. Furthermore, as mentioned above, an important aspect of the present invention shown in Figure 7 is that the weight inserted into either the internal heel receptacle or the internal toe receptacle is completely concealed and not visible in this figure. This is an important aspect of the present invention, as mentioned above.

[0035] In addition to enhancing this important feature of the present invention, the width d2 of the weight assembly 710 is shown, measured from the heel side point of the weight assembly 710 to the toe side point of the weight assembly 710. As shown in this embodiment of the present invention, the width d2 is generally greater than about 45 mm, more preferably greater than about 50 mm, and most preferably greater than about 55 mm, and this is not a departure from the scope and subject matter of the present invention.

[0036] Figure 8 of the attached drawings shows a cross-sectional view of the golf club head 800 along section line A-A' shown in Figure 5, where the fastener 816 is located below the center of the golf club head. This cross-sectional view of the golf club head 800 along section line A-A' shows how the internal components of the fastener 812 are used to secure the cover 810 to the threaded receptacle 820 of the rear cavity along the weight shaft 836.

[0037] Figure 9 of the attached drawings shows a cross-sectional view of the golf club head 900 along the section line B-B' shown in Figure 5, which is the location where the internal toe receptacle 924 is divided. This cross-sectional view of the golf club head 900 along section line B-B' shows the internal components of the cover 912 that conceals the rear cavity, and the internal toe receptacle 924 does not contain any weights.

[0038] Figure 10 of the attached drawings shows a cross-sectional view of the golf club head 1000 along the section line C-C' shown in Figure 5, which is the location where the heel receptacle 1022 is divided. This cross-sectional view of the golf club head 1000 along section line C-C' shows the internal components of the cover 1012 that conceals the rear cavity. The internal heel receptacle 1022 includes a weight 1016.

[0039] 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.

[0040] 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.

[0041] 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. [Explanation of symbols] 100 Golf Club Heads 104 Sole 106 Back section 110 Weight Assembly 200 Golf Club Heads 208 Rear Cavity 210 Weight Assembly 212 Cover 214 Through hole 216 weights 218 Fastener 220 Threaded Receptacle 301 Coordinate System 310 Weight Assembly 316 weights 318 Fastener 322 Internal Heel Receptacle 324 Internal toe receptacle 410 Weight Assembly 416 weights 418 Fastener 422 Internal Heel Receptacle 424 Internal toe receptacle 500 Golf Club Heads 501 Coordinate System 502 Hitting Face 532 Face Center 534 Center of gravity 600 Golf Club Heads 601 Coordinate System 610 Weight Assembly 612 Cover 616 weights 618 Fastener 636 Weight axis 638 Loft Plan 640 Ground Plan 700 Golf Club Heads 710 Weight Assembly 712 Cover 800 Golf Club Heads 810 Cover 816 Fastener 820 Threaded Receptacle 836 Weight axis 900 Golf Club Heads 912 Cover 924 Internal toe receptacle 1000 Golf Club Heads 1012 cover 1016 weight 1022 Internal Heel Receptacle

Claims

1. The main body and It has a weight assembly, The main body mentioned above is further, A striking face having a flat surface and a lower edge, The sole extends backward from the lower edge mentioned above, A rear portion positioned behind the above-mentioned striking face and connected to the rear portion of the above-mentioned sole, The main body portion has a rear cavity formed near the sole, The above weight assembly further, A cover adapted to completely cover the aforementioned rear cavity, further, Internal heel receptacle and, An internal toe receptacle that is spaced apart from the internal heel receptacle and is not continuous with the internal heel receptacle, The cover has a through hole provided between the internal heel receptacle and the internal toe receptacle, A weight, wherein the position of the weight is adapted to engage with a portion of the inner surface of the internal heel receptacle or the internal toe receptacle so that the position of the weight is variable in the direction in which the internal toe receptacle and the internal heel receptacle are aligned, It has a fastener adapted to engage with the above-mentioned through hole and attach the above-mentioned cover to the above-mentioned main body portion, The cover is characterized in that the weight is attached to at least one of the internal heel receptacle or the internal toe receptacle, and the cover completely hides the weight when the cover is fully attached to the rear cavity using the fastener.

2. The golf club head according to claim 1, wherein the distance d1 between the center of gravity of the golf club head and the center of the face is 2 mm to 8 mm.

3. The golf club head according to claim 2, wherein the above distance d1 is 3 mm to 7 mm.

4. The golf club head according to claim 3, wherein the above distance d1 is 3 mm to 6 mm.

5. The golf club head according to claim 1, wherein the weight assembly is capable of a delta change (Δx) along the x-axis between 0 mm and 2.5 mm.

6. The golf club head according to claim 5, wherein the weight assembly can achieve the delta change (Δx) along the x-axis between 0 mm and 2.0 mm.

7. The golf club head according to claim 6, wherein the weight assembly can achieve the delta change (Δx) along the x-axis between 0 mm and 1.8 mm.

8. The above fastener moves along the weight axis, The golf club head according to claim 5, wherein the weight axis forms an angle α between -10 degrees and +10 degrees with the striking face plane.

9. The golf club head according to claim 8, wherein the angle α is between -5 degrees and +10 degrees.

10. The golf club head according to claim 9, wherein the angle α is between 0 degrees and +10 degrees.

11. The golf club head according to claim 1, wherein the weight partially fills at least one of the internal heel receptacle or the internal toe receptacle.

12. The golf club head according to claim 11, wherein the weight occupies at least one of the internal heel receptacle or the internal toe receptacle.

13. The golf club head according to claim 12, wherein the arrangement of the weights leaves a gap on the proximal side of at least one of the internal heel receptacle or the internal toe receptacle.

14. The main body and It has a weight assembly, The main body mentioned above is further, A striking face having a flat surface and a lower edge, The sole extends backward from the lower edge mentioned above, A rear portion positioned behind the above-mentioned striking face and connected to the rear portion of the above-mentioned sole, the rear portion including the muscle portion, The main body portion has a rear cavity formed near the sole, The above weight assembly further, A cover adapted to completely cover the aforementioned rear cavity, further, Internal heel receptacle and, An internal toe receptacle that is spaced apart from the internal heel receptacle and is not continuous with the internal heel receptacle, The cover has a through hole provided between the internal heel receptacle and the internal toe receptacle, A weight, wherein the position of the weight is adapted to engage with a portion of the inner surface of the internal heel receptacle or the internal toe receptacle so that the position of the weight is variable in the direction in which the internal toe receptacle and the internal heel receptacle are aligned, It has a fastener adapted to engage with the above-mentioned through hole and attach the above-mentioned cover to the above-mentioned main body portion, The above fastener moves along the weight axis, The golf club head is characterized in that the weight axis described above forms an angle α between -10 degrees and +10 degrees with the striking face plane described above.

15. The golf club head according to claim 14, wherein the angle α is between -5 degrees and +10 degrees.

16. The golf club head according to claim 15, wherein the angle α is between 0 degrees and +10 degrees.

17. The golf club head according to claim 16, wherein the weight assembly is capable of a delta change (Δx) along the x-axis between 0 mm and 2.5 mm.

18. The golf club head according to claim 17, wherein the weight assembly can achieve the delta change (Δx) along the x-axis between 0 mm and 2.0 mm.

19. The golf club head according to claim 18, wherein the weight assembly can achieve the delta change (Δx) along the x-axis between 0 mm and 1.8 mm.

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