JP4326065B2 - Iron type golf club head - Google Patents

Iron type golf club head Download PDF

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Publication number
JP4326065B2
JP4326065B2 JP10826099A JP10826099A JP4326065B2 JP 4326065 B2 JP4326065 B2 JP 4326065B2 JP 10826099 A JP10826099 A JP 10826099A JP 10826099 A JP10826099 A JP 10826099A JP 4326065 B2 JP4326065 B2 JP 4326065B2
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Japan
Prior art keywords
sole
portion
side
head
specific gravity
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP10826099A
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Japanese (ja)
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JP2000296192A (en
Inventor
眞徳 藪
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Sriスポーツ株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an iron-type golf club head that is easy to hit and can be manufactured at low cost.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, materials such as fiber reinforced resins have been generally used for iron-type golf club heads (hereinafter sometimes simply referred to as “heads”) in addition to metal materials such as soft iron, stainless steel, and zinc alloys. However, in recent years, a combination of a low specific gravity material and a high specific gravity material has been proposed in order to enlarge the sweet area and minimize the loss of flight distance at the time of a miss shot. For example, in Japanese Patent No. 2850314, as shown in FIG. 10 and FIG. 11 which is a DD cross section thereof, a shaft attachment portion a2 for mounting a shaft is provided on the heel side of the face base portion a1 where the face surface F is formed. A head composed of a head main body a and an annular weight c made of a high specific gravity material and disposed along the outer periphery of the rear surface b on the back surface (back face) b of the head main body a is disclosed.
[0003]
Such a head can distribute more of its weight to the periphery of the head and the sole s side, making it possible to expand the sweet area by increasing the moment of inertia and lowering the center of gravity, and to make it easier to raise the ball higher. To do. However, since the weight c is provided along the outer periphery of the back surface b of the head main body a1, the boundary line e between the head main body a1 and the weight c is formed on the head outer peripheral surface, that is, the sole s, the toe t, and the top portion g. It will be formed continuously. Therefore, in such a head, a high-precision finishing process is required so that the surfaces of different members (the head main body a1 and the weight c) appearing on the outer peripheral surface of the head having a complicated shape are flush with each other without a step. Compared with the finishing process of the outer peripheral surface of the head made of one kind of material, it takes much labor and time, and it is inferior in productivity and has the disadvantage of increasing the price of the head.
[0004]
The present invention has been devised in view of the above-mentioned problems, while reducing the appearance of the boundary between the head main body and the weight as described above on the outer peripheral surface of the head as much as possible while improving ease of hitting. An object of the present invention is to provide an iron-type golf club head that can be manufactured at a low cost by simplifying the finishing process of the head outer peripheral surface.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention is an iron type golf club head having a head body provided with a shaft mounting portion for mounting a shaft on the heel side of a face base portion on which a face surface is formed, and a weight member. The face base portion is made of a low specific gravity material having a specific gravity of 5.0 or less, and has a plate-like portion forming the face surface, and protrudes toward the back face side at the periphery of the plate-like portion, along the periphery. A rib having an inner wall surface facing the annular center side by extending in an annular shape and having one or more notched portions cut out on the sole side, and the protruding amount of the rib from the plate-like portion is a top portion The weight member gradually increases from g to the sole s, and the weight member is made of a high specific gravity material having a specific gravity of 7.0 or more, and the weight member forms an annular shape along the inner wall surface of the rib. A base-like substrate, a sole weight piece formed on the sole side of the annular substrate and inserted into the notch to form a part of the surface of the sole, and a thickness smaller than the annular substrate and from the inner peripheral surface thereof look including a backing member extending along said plate-like portion of the face base, yet the backing is characterized in that covers at least a sole side of the internal annular body.
[0006]
The notch includes a toe-side notch provided near the toe side and a heel-side notch provided near the heel,
The sole weight piece includes a toe side sole weight piece fitted into the toe side cutout portion, and a heel side sole weight piece fitted into the heel side cutout portion, and the plate-like shape The portion can include a shaft body that is positioned by protruding from the plate-like body toward the back face side and inserted into the sole weight piece . The notch portion includes a toe side notch portion provided near the toe side and a heel side notch portion provided near the heel side, and the sole weight piece includes the notch portion on the toe side. A toe-side sole weight piece to be fitted into the portion, and a heel-side sole weight piece to be fitted into the heel-side cutout portion.
[0007]
The notch can be formed by completely removing the rib from the plate-like body or by cutting out the protruding amount of the rib at least partially.
[0008]
Further, it is desirable that the neck length L, which is the length from the upper end of the shaft mounting portion to the point where the center line of the shaft mounting portion intersects the horizontal plane, is 70 mm or less. When the shaft mounting portion is shortened in this way, it is desirable that the outer diameter D at the upper end of the shaft mounting portion is 13.2 mm or more.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an iron-type golf club head 1 according to the present embodiment as viewed from the back face side, FIG. 2 is an exploded view thereof, FIG. 3A is a cross-sectional view taken along line AA in FIG. (B) shows a sectional view taken along the line B-B. In the figure, a head 1 of this embodiment is composed of a head body 2 and a weight member 3.
[0010]
The head body 2 is configured by providing a shaft mounting portion 2b for mounting a shaft (not shown) on the heel h side of the face base portion 2a on which a face surface F serving as a ball hitting surface is formed. In this embodiment, the head main body 2, that is, the face base portion 2a and the shaft mounting portion 2b are both integrally formed of the same low specific gravity material having a specific gravity of 5.0 or less.
[0011]
Examples of such a low specific gravity material include pure titanium (specific gravity of about 4.5), titanium alloy (specific gravity of about 4.4 to 4.7), magnesium alloy (specific gravity of about 1.8 to 2.3), duralumin ( Specific gravity is about 2.8) or an aluminum-lithium (Al-Li) alloy (specific gravity is about 2.6). If the specific gravity is excessively small, the head is remarkably enlarged in order to secure the minimum weight required for the head, and the contact area with the turf tends to increase and the head swinging tends to be poor. From this point of view, it is desirable that the low specific gravity material has a specific gravity of 1.5 or more, more preferably 3.0 to 5.0, and a titanium alloy having a high specific strength is adopted in view of strength. Is particularly preferred.
[0012]
In this way, the face base 2a is made of a low specific gravity material, so that the face base 2a can be reduced in weight, and accordingly, more weight can be distributed around the head. The head body 2 can also be configured by combining two or more kinds of low specific gravity materials.
[0013]
As shown in FIGS. 2 and 3, the face base portion 2a has a plate-like portion 4 forming the face surface F, and protrudes toward the back face side at the periphery and extends in an annular shape along the periphery and cuts the sole s side. And a rib 5 having one or more notched portions 6 that are lacking. In this example, a recess C (so-called cavity) is formed inside the rib 5 . Thus, the rib 5 forms the inner wall part 5i facing the annular center side. In the rib 5, the plate-like portion 4 has a thickness T1 of about 3 to 5 mm, for example, approximately 4 mm in this example, and a score line or the like is appropriately recessed in the face surface F.
[0014]
The ribs 5 are formed on the top portion g, the toe t, the sole s, and the heel h of the head 1 except for the notched portion 6 of the sole s . The amount of projection of a plate-like portion 4 of the rib 5 in this example is gradually Daito ing toward the top portion g on the sole s. Further, the notch 6 of this example is formed with two including a toe-side notch 6A provided near the toe t side and a heel-side notch 6B provided near the heel h side.
[0015]
A small-length rib 5 is interposed between the notch portion 6A on the toe side and the notch portion 6B on the heel side. Such a cut-out portion 6 may be cut out by, for example, reducing the protruding amount of the rib 5 at least partially in addition to the embodiment of FIG. 2 in which the rib 5 is completely removed from the plate-like body 4. . Further, in this example, the notched portion 6 is provided with a shaft body 11 that protrudes in a conical shape from the plate-like portion 4 to the back face side, for example.
[0016]
The weight member 3 is made of a high specific gravity material having a specific gravity of 7.0 or more. Here, examples of the high specific gravity material include stainless steel (specific gravity of about 7.8 to 8.0), nickel-copper alloy (specific gravity of about 8.9), tungsten alloy (specific gravity of about 12 to 15), or tungsten (specific gravity of about 18). ), Platinum (specific gravity of about 21.3), copper alloy (specific gravity of about 8 to 13), and the like. In consideration of workability and economy, stainless steel, nickel-copper alloy, tungsten alloy or tungsten is particularly preferable. From a practical viewpoint, the specific gravity is preferably about 7.0 to 20.0.
[0017]
Further, in this example, the weight member 3 is formed in an annular base 7 having an annular shape along the inner wall surface 5i of the rib 5, and is formed on the sole s side of the annular base 7 and is fitted into the notch 6 to be fitted into the sole s. 1 including a sole weight piece 9 forming a part of the surface and a backing material 10 having a thickness smaller than that of the annular base 7 and extending from the inner peripheral surface along the plate-like portion 4 of the face base portion 2a. In this example, it is exposed and arranged on the back face side.
[0018]
The annular base body 7 made of the high specific gravity material as described above is arranged around the center of gravity G (shown in FIG. 4B) of the head 1 in an annular shape. For this reason, the head 1 can distribute more of the weight to the peripheral portion of the head 1 and increase the moment of inertia. Further, since the weight member 3 includes a sole weight piece 9 which is inserted into a notch portion 6 in which the rib 5 is notched on the sole s side to form a part of the surface of the sole s, the weight of the head 1 is increased. More distribution is also made on the sole side to promote a lower center of gravity. As a result, the height Sh of the sweet spot SS (shown in FIG. 4B), which is a perpendicular foot drawn from the center of gravity G to the face surface F, is reduced in the head 1, and as a result, the hit ball has a high launch angle and low back. Ease of hitting can be greatly improved by increasing the amount of spin and making it easier to raise the ball.
[0019]
Since the weight member 3 is along the inner wall surface 5i of the rib 5 as shown in FIG. 1, it does not appear at all on the outer peripheral surface of the head 1, such as the top portion g or the toe t, as shown in FIG. Only the sole weight piece 9 appears on a part of the surface of the sole s. Thereby, the head 1 can prevent the finishing process of the outer peripheral surface of the head from becoming complicated while reducing the center of gravity, and can be produced inexpensively and efficiently. Note that a boundary line between the head main body 2 and the weight member 3 is formed on the back face side, but the back face compared to the outer peripheral surface of the head including the top portion g, the toe t, and the like is configured by a substantially simple curved surface. Therefore, finishing work can be easily performed.
[0020]
Also, the sole weight piece 9 of this example includes a toe side sole weight piece 9A and a heel side sole weight piece 9B, which respectively fit into the toe side cutout portion 6A and the heel side cutout portion 6B. Thus, the weight can be more effectively distributed and distributed to the toe and heel of the head 1. Each sole weight piece 9A, 9B is formed with an insertion hole 3a (shown in FIG. 3 (A)) for inserting the conical shaft body 11 to facilitate positioning with the head body 2. Helps to strengthen the fixation.
[0021]
As shown in FIGS. 4A and 4B, such a head 1 has the center line CL of the shaft mounting portion 2b positioned in the vertical plane N and is inclined at the design lie angle α. In the reference state sole on the horizontal plane H, not only the moment of inertia about the X axis, which is the horizontal axis along the face surface passing through the sweet spot SS of the head 1, but also the moment of inertia about the Y axis, which is a vertical axis perpendicular to the moment of inertia. For example, it is possible to reduce the movement of the face around the Y axis when hitting the ball near the heel or toe, and to suppress a loss in flight distance and a large deviation in directionality. Is preferable.
[0022]
4C, the length U in the toe-heel direction along the sole S of the sole weight piece 9 (when there are a plurality of sole weight pieces, the total of the respective lengths U1, U2,... The length is preferably 10 mm or more, more preferably 30 mm or more, and still more preferably 45 mm or more, from the viewpoint of lowering the center of gravity. In this example, the sole weight piece 9 has a length Q in the sole width direction larger than the thickness T1 of the plate-like portion 4 in the sole s.
[0023]
Further, in this example, the weight member 3 includes the backing material 10, whereby the thickness of the face portion can be secured, the rigidity of the face portion can be increased, and a solid shot feeling can be obtained. The thickness T2 of the backing material 10 is preferably about 3 to 6 mm, for example. The backing material 10 may cover the entire inside of the annular base body 7, or may partially cover the sole S side as in this example.
[0024]
In the present embodiment, as shown in FIG. 4A, in the reference state, the head 1 has the center line CL of the shaft mounting portion 2b intersecting the horizontal plane H from the upper end 2e of the shaft mounting portion 2b. The neck length L, which is the length up to the point K, is set to a small length of 70 mm or less. As a result, the center of gravity of the head 1 can be further lowered. However, if the neck length L is excessively small, the bonding area between the shaft and the head 1 tends to decrease. Therefore, it is desirable to secure 30 mm or more, more preferably 35 to 70 mm.
[0025]
When the neck length L is small as described above, it is desirable to set the outer diameter D at the upper end 2e of the shaft mounting portion 2b to 13.2 mm or more, which is larger than the conventional diameter. It is. As a result, the weight of the shaft mounting portion 2b can be secured to some extent while maintaining a small length, and for example, the center of gravity distance E of the head (the shortest distance from the sweet spot SS of the head to the center line of the shaft mounting portion 2b) becomes significantly large. Can be effectively suppressed. As a result, it is possible to prevent the head 1 from returning poorly. The outer diameter D is preferably continuous at least 30 mm from the upper end 2e of the shaft mounting portion 2b to the sole side. If the outer diameter D is too large, the weight of the shaft mounting portion 2b becomes excessive. Therefore, it is preferably 14.0 to 15.0 mm, more preferably 14.0 to 14.6 mm.
[0026]
In addition, the head 1 is joined by, for example, press-fitting and fitting the head body 2 and the weight member 3 together, or by bonding with an adhesive, welding, screwing, brazing, or the like alone or in combination. can do. Note that it is particularly desirable to use a combination of caulking and an adhesive that provides a stable bonding strength and is beautiful in appearance.
[0027]
The head shown in FIG. 5 includes a plate-like portion 4 having a face base portion 2a that forms the face surface F, a peripheral portion protruding toward the back face side, an annular shape extending along the peripheral edge, and a notch on the sole s side. The thing which has the rib 5 which has the notch part 6 is illustrated. Further, the weight member 3 includes one sole weight piece 9 that fits in the notch portion 6 and the backing material 10 that is partially disposed on the top side inside the annular base body 7 in this example. It is out.
[0028]
Although the embodiments of the present invention have been described in detail above, the shapes and materials of the head main body and the weight member are not limited to the illustrated embodiments, and various modifications and combinations may be implemented. For example, a bulging portion may be provided inside the rib 5 of the head main body 2a, and the back face side of the head 1 may be flat.
[0029]
【Example】
In order to confirm the effect of the present invention, FIG. 1, a golf club head (Example 1, the ratio Comparative Examples 5) shown in FIG. 5 was measured prototype (both fifth I) performance by specification in Table 1. For comparison, the same measurement was performed for the golf club heads (Comparative Examples 1 to 4) shown in FIGS. In addition, the upper end outer diameter D of the shaft attachment part of Comparative Examples 1-4 was unified into 13.0 mm, and neck length L was 71 mm, 48 mm, 71 mm, and 60 mm, respectively.
[0030]
The measured values are the sweet spot height from the horizontal plane, the moment of inertia around each of the X and Y axes (each is an exponent value with Example 2 as 100, and the larger the value, the better the center of gravity distance, the neck length). And the outer diameter at its upper end. In addition, a golf club was prototyped with a shaft attached to each head, and a trial hit test was conducted by a swing robot and 10 average golfers.
[0031]
In the trial hit test using a swing robot, the face angle was set so that the head speed upon impact of the ball was 36 m / s and the side spin amount of the ball after launch was ± 200 rpm, manufactured by Sumitomo Rubber Industries, Ltd. TOUR SPECIAL SOFT & METAL golf balls were hit, and the ball launch angle and backspin amount were measured. In addition, in a test hit test by 10 golfers, each of the golfers evaluated the ease of raising the ball and the degree of variation of the ball in five stages by hitting the above balls 20 times from the turf of the golf course fairway. The average value of evaluation was shown. The evaluation shows that the larger the numerical value, the easier the ball rises and the less likely it is to vary.
[0032]
Tables 1 and 2 show the test results. As is clear from the table, it can be confirmed that the heads of the examples and the golf clubs using the heads are easier to hit than the comparative examples and prevent the deterioration of productivity.
[0033]
[Table 1]
[0034]
[Table 2]
[0035]
【The invention's effect】
As described above, according to the first aspect of the present invention, the annular weight member made of a high specific gravity material is disposed along the rib formed on the peripheral edge of the plate-like portion forming the face surface. Can be distributed more around the periphery of the, and the moment of inertia can be increased. In addition, the weight member includes a sole weight piece that forms a part of the surface of the sole portion by being inserted into the notch portion where the rib is notched on the sole side, so that the center of gravity of the head is lowered, and the sweet spot height is thereby increased. Easier to hit, such as reducing the ball and raising the ball. Furthermore, since the weight member is arranged along the inner wall surface of the rib, it does not appear on the top part or the toe part that forms the outer peripheral surface of the head, but appears only on a part of the sole part surface, thereby reducing the center of gravity. However, it is possible to prevent the finishing process of the outer peripheral surface of the head from becoming complicated, and the head can be produced inexpensively and efficiently.
[0036]
In the invention according to the second aspect, more weight can be distributed to the toe side and the heel side of the sole. As a result, in the reference state in which the head is solesed on a horizontal plane, the moment of inertia around the Y axis, which is the vertical axis passing through the sweet spot of the head, can be further increased, for example, when the ball is hit near the heel or toe The movement of the face around the Y axis can be reduced, and loss of flight distance and large deviation in directionality can be suppressed. In addition, the plate-like portion includes a shaft body that projects from the plate-like body toward the back face side and is inserted into the sole weight piece, so that the sole weight piece on the back face side is correctly aligned. it can.
[0037]
According to a fourth aspect of the present invention, the neck length L, which is the length from the upper end of the shaft mounting portion to the point where the center line of the shaft mounting portion intersects the horizontal plane, is shortened to 70 mm or less, By further reducing the center of gravity while setting the outer diameter D at the upper end of the shaft mounting portion to 13.2 mm or more, it is effective that the weight of the shaft mounting portion is secured to some extent and the center of gravity distance of the head is remarkably increased. And the ease of returning the head can be maintained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a head according to an embodiment as viewed from a back face side.
FIG. 2 is an exploded view thereof.
3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3B is a cross-sectional view taken along the line BB in FIG.
4A is a front view of a head in a reference state, and FIG. 4B is a side view thereof.
FIG. 5 is an exploded perspective view of a head showing another embodiment as viewed from the back face side.
6A is a rear view of the head of Comparative Example 1, and FIG. 6B is an xx ′ sectional view thereof.
7A is a rear view of the head of Comparative Example 2, and FIG. 7B is a sectional view taken along line yy ′ thereof.
8A is a rear view of the head of Comparative Example 3, and FIG. 8B is a zz ′ cross-sectional view thereof.
9A is a rear view of the head of Comparative Example 4, and FIG. 9B is a cross-sectional view taken along the line vv ′.
FIG. 10 is a perspective view of a conventional head.
FIG. 11 is a sectional view taken along the line DD.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Iron type golf club head 2 Head main body 2a Face base 2b Shaft attachment part 3 Weight member 4 Plate-like part 5 Rib 6 Notch part 6A Toe side notch part 6B Heel side notch part 7 Annular base body 9 Sole weight Piece 9A sole weight piece on the toe side 9B sole weight piece on the heel side s sole t toe h heel g top part

Claims (5)

  1. An iron-type golf club head having a head body provided with a shaft mounting portion for mounting a shaft on a heel side of a face base portion on which a face surface is formed, and a weight member,
    The face base is made of a low specific gravity material having a specific gravity of 5.0 or less,
    A plate-like portion forming the face surface;
    A rib having one or more notches that protrude toward the back face at the periphery of the plate-like portion and have an inner wall surface facing the center of the ring by extending annularly along the periphery, and also having a notch on the sole side Including
    The protruding amount of the rib from the plate-like portion gradually increases from the top portion g toward the sole s,
    The weight member is made of a high specific gravity material having a specific gravity of 7.0 or more,
    The weight member is an annular base body that forms an annular shape along the inner wall surface of the rib,
    A sole weight piece that is formed on the sole side of the annular base and is inserted into the notch to form part of the surface of the sole;
    And a backing material that is smaller in thickness than the annular base and extends from the inner peripheral surface along the plate-like portion of the face base, and
    An iron-type golf club head characterized in that the backing material covers at least the sole side inside the annular base body .
  2. The notch includes a toe-side notch provided near the toe side and a heel-side notch provided near the heel,
    The sole weight piece includes a toe side sole weight piece fitted into the toe side cutout portion and a heel side sole weight piece fitted into the heel side cutout portion , and the plate-like shape 2. The iron-type golf club head according to claim 1, wherein the portion includes a shaft body that projects from the plate-like body toward the back face side and is inserted into the sole weight piece .
  3. The said notch part was formed by removing a rib from the said plate-shaped object completely, or reducing the protrusion amount of a rib at least partially, and forming it. Iron type golf club head.
  4. The shaft attachment portion has a cylindrical body into which the shaft can be inserted, and an outer diameter D at the upper end of the center line thereof is 13.2 mm or more.
    In a reference state in which the center line of the shaft mounting portion is positioned in the vertical plane and the center line is inclined at a design lie angle and is solesed on a horizontal plane, the center line of the shaft mounting portion extends from the upper end of the shaft mounting portion The iron-type golf club head according to any one of claims 1 to 3 , wherein a neck length L, which is a length up to a point where the crossing points, is 70 mm or less.
  5. 5. The iron-type golf club head according to claim 1, wherein the low specific gravity material is made of pure titanium or a titanium alloy, and the high specific gravity material is made of stainless steel, a nickel-copper alloy, a tungsten alloy, or tungsten. .
JP10826099A 1999-04-15 1999-04-15 Iron type golf club head Expired - Fee Related JP4326065B2 (en)

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JP10826099A JP4326065B2 (en) 1999-04-15 1999-04-15 Iron type golf club head

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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6962538B2 (en) 2004-03-11 2005-11-08 Acushnet Company Golf club head with multiple undercuts
JP2005334648A (en) 2004-04-21 2005-12-08 Acushnet Co Transitioning hollow golf clubs
US7922604B2 (en) * 2006-07-21 2011-04-12 Cobra Golf Incorporated Multi-material golf club head
US8870682B2 (en) 2006-07-21 2014-10-28 Cobra Golf Incorporated Multi-material golf club head
US9586104B2 (en) 2006-07-21 2017-03-07 Cobra Golf Incorporated Multi-material golf club head
US8062150B2 (en) * 2007-09-13 2011-11-22 Acushnet Company Iron-type golf club
US8206241B2 (en) * 2009-07-27 2012-06-26 Nike, Inc. Golf club assembly and golf club with sole plate
US20110081986A1 (en) * 2009-10-01 2011-04-07 Nike, Inc. Golf clubs and golf club heads having a removable mass ring
US8092318B2 (en) * 2009-10-12 2012-01-10 Nike, Inc. Golf club assembly and golf club with suspended face plate
US8827831B2 (en) 2010-06-01 2014-09-09 Taylor Made Golf Company, Inc. Golf club head having a stress reducing feature
US8821312B2 (en) 2010-06-01 2014-09-02 Taylor Made Golf Company, Inc. Golf club head having a stress reducing feature with aperture
US8235844B2 (en) 2010-06-01 2012-08-07 Adams Golf Ip, Lp Hollow golf club head

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