KR101861715B1 - Golf Club Head Having Optimized Ball Speed to CT Relationship - Google Patents

Abstract

을 만족하는 골프 클럽 헤드가 본 명세서에 개시된다. 본체는 페이스(face)부, 소울부, 및 크라운 또는 리턴부를 포함하고, 중공의 내부를 정의한다. 복수의 보강 부재의 각각은 골프공과 충돌 시 페이스부 상에 가해지는 응력을 저감시키기 위해, 중공 내부에 크라운 또는 리턴부로부터 소울부까지 연장된다. 보강 부재들은 모두 페이스의 중심과 수직인 평면을 따라 측정된 페이스부의 후면의 1인치 이내에 위치되며, 중공 내부에 서로 0.500 내지 2.00 인치의 거리로 이격된다.A main body and a plurality of reinforcing members,

0.0 > a < / RTI > golf club head is disclosed herein. The body includes a face portion, a soul portion, and a crown or return portion, and defines a hollow interior. Each of the plurality of reinforcing members extends from the crown or the return portion to the soul portion inside the hollow portion in order to reduce the stress applied on the face portion in the collision with the golf ball. The reinforcing members are all located within 1 inch of the backside of the face portion measured along a plane perpendicular to the center of the face and are spaced from each other by a distance of 0.500 to 2.00 inches in the hollow interior.

Description

[0001] The present invention relates to a golf club head having an optimum ball velocity versus time (CT)

The present invention is a continuation-in-part of US patent application Ser. No. 15 / 051,361, filed Feb. 23, 2016, and Ser. No. 15 / 051,361, filed on January 15, 2016, 14 / 997,199, which is a continuation-in-part of U.S. Patent Application No. 14 / 788,326, filed June 30, 2015, No. 14 / 794,578, filed on June 30, 2015, which is a continuation-in-part of U.S. Patent Application No. 14 / 794,578 filed on June 30, 2015, Is a continuation-in-part of U.S. Patent Application No. 14 / 498,843, filed September 26, 2014, and U.S. Patent No. 9,259,627, filed February 16, 2016, which is filed February 5, 2014, U.S. Patent Application No. 14 / 173,615, filed November 10, U.S. Patent No. 9,180,349 9,180,349 is a continuation-in-part of U.S. Patent Application No. 14 / 039,102, filed September 27, 2013, and assigned to U.S. Patent No. 8,834,294, issued September 16, 2014, and U.S. Patent No. 8,834,294, No. 13 / 797,404, filed March 12, 2013 and now abandoned, and Ser. No. 13 / 797,404, filed on June 27, 2012, and U.S. Provisional Patent Application No. 61 / 665,203 filed June 27, 2012, U.S. Patent Application No. 61 / 684,079, filed August 16, 2005, the disclosures of each of which are incorporated herein by reference in their entirety. U.S. Patent Application No. 14 / 997,199 is also a continuation-in-part of U.S. Patent Application No. 14 / 622,606, filed February 13, 2015, and U.S. Patent No. 9,345,936, issued May 24, 2016, U.S. Patent Application No. 13 / 906,572, filed May 31, 2015, and U.S. Patent No. 8,956,244, filed February 17, 2015, the disclosure of each of which is incorporated herein by reference in its entirety.

The present invention relates to a golf club head. More particularly, the present invention relates to stress-reducing features that connect a crown portion and a sole portion through a hollow interior and are disposed proximate the striking face section, To a golf club head.

The prior art discloses various golf club heads having internal structures. For example, US Pat. No. 6,299,547 to Kosmatka for a golf club head with an internal striking plate brace discloses a golf club head with a bracing to limit deflection of the striking plate, U.S. Patent No. 6,85,208 to Yabu on a club head and its method of manufacture discloses a golf club head with a sound bar and is described in Callaway, U.S. Patent 7118493 for a multiple material golf club head A golf club head having a composite aft body with an interior sound component extending upwardly from a sole section of a metal face component, US Patent No. 8834294 to Seluga et al. Discloses a golf club head having a center of gravity adjustability, Discloses a golf club head having a tube with a mass for adjusting the center of gravity (CG) of the club head and is disclosed in U.S. Patent No. 8900070 to Dawson et al., For a Weighted Golf Club Head, A golf club head having an interior weight lip extending from a soul toward a face.

However, the prior art does not disclose an internal structure that increases the ball speed by reducing the stress of the striking surface during a collision while minimizing the mass of the golf club head.

The golf club head includes an inner structure that connects the crown portion to the sole portion to reduce the stress on the striking surface portion when the golf ball collides with the golf ball. In some embodiments, the internal structure is hollow tubes or solid rods made of a titanium alloy.

을 만족하고, 그리고

이다. 추가의 실시형태에서, 골프 클럽 헤드는 방정식

을 만족할 수 있다. One aspect of the present invention is to provide a striking surface portion, a sole portion extending from a lower edge of the striking surface portion, and a crown portion extending from an upper edge of the striking surface portion, wherein the striking surface portion, the sole portion, and the crown portion define And at least one reinforcement member disposed within the hollow body and extending from the crown portion to the soul portion, wherein the striking surface portion faces the interior of the hollow body wherein the at least one reinforcing member is located at a position less than or equal to one inch from the rear face surface along a vertical plane extending through a face center perpendicular to the striking face portion, Wherein no part of said at least one reinforcement member contacts the striking surface,

, And

to be. In a further embodiment,

Can be satisfied.

In some embodiments, the at least one reinforcing member may include first and second reinforcing members, the first reinforcing member may extend substantially parallel to the second reinforcing member, and the first reinforcing member may extend substantially parallel to the first reinforcing member, The reinforcing member may be spaced from the second reinforcing member by a distance of 0.75 to 1.50 inches. In a further embodiment, each of the first and second stiffening members may comprise a structure selected from the group consisting of a solid rod and a hollow tube. In yet another further embodiment, each of the first and second stiffening members may be a solid rod comprised of a metallic material selected from the group consisting of a titanium alloy and steel. In an alternative embodiment, the at least one stiffening member may be disposed at a position less than 0.25 inches from the rear face surface along a vertical plane extending through a face center perpendicular to the striking face portion. In a further embodiment, the at least one reinforcing member may include an upper end proximate to the crown portion and a lower end adjacent to the soul portion, the upper end being spaced a first distance from the rear face surface, The first distance may be less than the second distance, and the first distance may be less than the second distance. In any of these embodiments, the golf club head may further include a cover piece, wherein the soul portion may include a plurality of cutouts, And at least partially cover each of the plurality of cutouts. In addition, in any of the embodiments, the golf club head may include a crown insert, the crown portion may include an upper opening, and the crown insert may cover the upper opening .

을 만족하고, 그리고

이다. 추가의 실시형태에서, 골프 클럽 헤드는 상부 개구를 폐쇄하도록 본체에 영구적으로 부착될 수 있는 크라운 인서트를 포함할 수 있다. 일부 실시형태들에서, 크라운 인서트는 탄소 복합 재료로 구성될 수 있으며, 제1 및 제2 보강 부재의 각각은 본체와 일체로 주조될 수 있다. Another aspect of the present invention is directed to a method of forming a stiffener comprising a striking surface portion, a sole portion extending from a lower edge of the striking surface portion, and a return section extending from an upper edge of the striking surface portion, And wherein the striking surface portion, the sole portion, and the return portion define a hollow body interior, and a first and a second body portion disposed within the hollow body and extending from the return portion to the soul portion, Wherein each of the first and second reinforcing members is a solid metal rod and that no part of the first or second reinforcing member is in contact with the striking surface portion, The golf club head is an equation

, And

to be. In a further embodiment, the golf club head may include a crown insert that may be permanently attached to the body to close the upper opening. In some embodiments, the crown insert may be constructed from a carbon composite, and each of the first and second reinforcement members may be cast integrally with the body.

In another embodiment, a golf club head may include a carbon composite cover piece, wherein the soul portion may include at least one cutout, and wherein the cover piece includes at least one cut- And may be permanently attached to the soul portion. In another embodiment, each of the first and second reinforcing members may have a length of 1.00 inch to 2.50 inches, the first reinforcing member may extend substantially parallel to the second reinforcing member, One reinforcing member may be spaced from the second reinforcing member by a distance of 0.500 to 2.00 inches. In another embodiment, the striking surface portion may include a face center and a rear face surface, and each of the first and second stiffening members may include a rear face extending along a vertical plane extending through a face center perpendicular to the striking face portion, And may be disposed at a position of 0.500 inches or less from the surface.

을 만족하고, 그리고

이다. 일부 실시형태들에서, 제1 보강 부재는 리턴부에 근접한 상단 및 소울부에 근접한 하단을 포함할 수 있으며, 상기 상단은 상기 타격면부로부터 제1 거리만큼 이격될 수 있고, 그리고 상기 하단은 상기 타격면부로부터 제2 거리 - 상기 제2 거리는 상기 제1 거리보다 큼 - 만큼 이격될 수 있다. 추가의 실시형태에서, 상기 제1 거리는 0.120 인치 내지 0.150 인치일 수 있고, 상기 제2 거리는 0.180 인치 내지 0.210 인치일 수 있다. 또 하나의 실시형태에서, 제1 및 제2 보강 부재의 각각은 1.00 인치 내지 2.50 인치의 길이를 가질 수 있으며, 상기 제1 보강 부재는 제2 보강 부재와 대체로 평행하게 연장될 수 있으며, 상기 제1 보강 부재는 제2 보강 부재로부터 0.75 인치 내지 1.50 인치의 거리만큼 이격될 수 있다. Another aspect of the present invention is directed to a stapler comprising a striking surface portion, a sole portion extending from a lower edge of the striking surface portion, a return portion extending from an upper edge of the striking surface portion, and an aft end opposite the striking surface portion, And a return portion defining a hollow interior of the body; a metal body disposed within the hollow body and defining an upper opening defined by the soul portion and the return portion; Wherein each of the first and second reinforcing members is a golf club head comprising a first and a second reinforcing members extending to the upper opening and a carbon composite crown insert permanently attached to the body to close the upper opening, Wherein the golf club head is positioned closer to the striking surface than the rear end in a hollow body, the golf club head having a volume of 420 cm 3 to 470 cm 3, The golf club head is an equation

, And

to be. In some embodiments, the first reinforcement member may include an upper end proximate the return portion and a lower end adjacent the soul portion, the upper end may be spaced a first distance from the striking surface portion, A second distance from the surface portion, the second distance being greater than the first distance. In a further embodiment, the first distance may be 0.120 inches to 0.150 inches, and the second distance may be 0.180 inches to 0.210 inches. In another embodiment, each of the first and second reinforcing members may have a length of 1.00 to 2.50 inches, and the first reinforcing member may extend substantially parallel to the second reinforcing member, One reinforcing member may be spaced from the second reinforcing member by a distance of 0.75 to 1.50 inches.

While the present invention has been described in brief, those skilled in the art will recognize from the following detailed description of the invention, when taken in conjunction with the accompanying drawings, those which are perceived by those skilled in the art, and which further objects, features and advantages of the invention emerge.

1 is a top perspective view of a preferred embodiment of a golf club head of the present invention.
2 is a bottom perspective view of the golf club head shown in FIG.
3 is a cross-sectional view of the golf club head according to line 3-3 shown in Fig.
4 is a cross-sectional view of the golf club head according to line 4-4 shown in FIG.
5 to 6 are cross-sectional views of the golf club head according to each of the lines 5-5 and 6-6 shown in Fig.
FIG. 7 is a top perspective view of the golf club head shown in FIG. 1 with the crown insert and the sole cover piece removed.
8 is a bottom perspective view of the embodiment shown in Fig.
9 is a flow chart illustrating a method for calculating a normalized ball velocity of a golf club head including the embodiment shown in FIG.
10 is a plan view of an exemplary calibration plate used to calculate a normalized ball speed of a golf club head.
11 is a cross-sectional view of the calibration plate according to line 11-11 shown in Fig.
12 is a graph showing the relationship between the normalized ball speed (y-axis) and the characteristic time (μ-axis) of a conventional golf club head and the inventive golf club head described herein .

1 to 8, a preferred embodiment of the golf club head 10 of the present invention is generally designated. The golf club head 10 includes a striking face section 30 having a face center 34 and a return section 31 extending away from the upper edge 31 of the striking surface section 30, A sole section 22 extending away from the lower edge 33 of the striking surface section 30 and a hosel 24 for engaging the shaft, a heel end 23, A toe end 25, an upper opening 26, a hollow interior 27, and a body end 20 having aft end 28. As shown in FIG. The crown portion 40 includes a return portion 32 and a crown insert 42 disposed over the top opening 26 to surround the hollow interior 27. The body 20 also includes three cutouts 70, 72, 74 in the central region 21 of the soul portion 22 that are less than the density of the material used to make the body 20 And closed by a cover piece 80 having a low density. Each of the crown portion 40 and the cover piece 80 is preferably made of a carbon composite material while the body 20 is made of a metal material such as titanium alloy or steel.

Two reinforcement members 50 and 52 are formed in the hollow interior 27 from the soul portion 22 to the return portion 32 substantially parallel to the rear face 36 of the striking face portion 30 and substantially parallel to each other, As shown in Fig. In an alternative embodiment, the reinforcing members 50, 52 may instead extend to the crown insert 42; Importantly, the reinforcing members 50, 52 do not contact any part of the striking surface portion 30, even when the striking surface portion 30 impacts the golf ball, and the crown portion 40 does not contact the striking surface portion 30 To the adjacent soul portion (22). The reinforcement members 50,52 should in any case be closer to the striking surface portion 30 than the rear end 28 of the body 20.

3, the preferred embodiment has two reinforcing members 50, 52, each being a solid rod of a lightweight, strong metal material such as titanium alloy or steel, but in an alternative embodiment, the reinforcing member 50 , 52 may be a hollow tube or other hollow structure made of a strong lightweight metal or composite material. In another embodiment, the golf club head 10 may include both a solid and hollow reinforcing member 50. The reinforcing members 50,52 are preferably cast together with the body 20 using a wax molding process, but in alternative embodiments may be added after the body 20 is manufactured, May be secured to the body 20 via welding, brazing, solder, or adhesives and / or mechanically.

In a preferred embodiment, each of the reinforcing members 50, 52 has a diameter of 0.050 inches to 0.200 inches, and a length of 1 to 2.5 inches. The reinforcing members 50 and 52 are located within one inch of the rear surface 36 of the striking surface portion 30 measured along the vertical surface 60 extending through the face center 34 perpendicular to the striking surface portion 30 . No portion of any reinforcement members 50,52 should be located outside this one inch range; In practice, it is more desirable that each reinforcing member 50, 52 is located closer to the back surface 36 of the striking surface portion 30. [ The upper ends 50a and 52a of the respective reinforcing members 50 and 52 are spaced apart from the gap 30 between the lower ends 50b and 52b by an interval D ₂ , (D ₁ ) slightly closer to the back surface (36). In a preferred embodiment, D ₁ ranges from 0.120 inch to 0.150 inch and D ₂ ranges from 0.180 inch to 0.210 inch. The reinforcing members 50, 52 are also spaced from one another by a distance D3 of 0.500 to 2.00 inches, more preferably about 0.75 to 1.50 inches, and most preferably about 1.00 inches. This position of the reinforcement members 50, 52 optimizes the normalized ball speed relationship for the Characteristic Time (CT), as measured by μS in the USGA CT test.

The normalized ball velocity is determined by testing the velocity of the golf ball upon impact with any given golf club head including the golf club head 10 of the present invention to determine the mass and loft of the golf club head ) And eliminating the variable effect of the composition of a particular golf ball; In other words, it enables apples-to-apples comparison for golf club head performance. The normalized ball speed may also be determined for the golf club head using the following steps shown in the flowchart of FIG.

)를 측정한다(단계 130). 다음으로, 플레이트의 질량(

), 골프공의 질량(

), 골프 클럽 헤드(10)의 질량(

), 측정 헤드 테스트 볼 속도(measured head test ball in velocity; 109 mph 목표)(

), 측정 플레이트 테스트 볼 속도(measured plate test ball in velocity; 109 mph 목표)(

), 측정 헤드 테스트 볼 리턴 속도(measured head test ball return velocity)(

), 및 측정 플레이트 테스트 볼 리턴 속도(measured plate test ball return velocity)(

)를 측정하고 기록한다(단계 140). 마지막으로 다음 방정식을 사용하여 정규화 볼 속도를 계산한다(단계 150): First, as shown in FIGS. 10 and 11, a mass of about 190 grams, a diameter of about 4 inches (D ₄ ), a minimum thickness (T ₁ ) of about 0.100 to 0.150 inches, and a maximum thickness of about 0.200 to 0.400 inches (T ₂ ), and strikes the center 92 of the calibration plate with a test golf ball moving at about 109 mph (step 100). The ball's return velocity is measured (step 110). Next, the same test golf ball which moves back to about 109 mph through the center 34 of the striking face portion 30 of the estimated golf club head 10 is struck (Step 120) and the repulsive speed (rebound velocity;

(Step 130). Next, the mass of the plate (

), The mass of the golf ball (

, The mass of the golf club head 10 (

), The measured head test ball velocity (109 mph target) (

), Measured plate test ball velocity (109 mph target) (

), The measured head test ball return velocity (

), And a measured plate test ball return velocity (

(Step 140). Finally, the normalized ball velocity is calculated using the following equation (step 150): < RTI ID = 0.0 >

는 100이고

는 200이다.In this equation

Is 100

Lt; / RTI >

, 그리고 보다 바람직하게는

를 갖는다. 본 발명의 보강 부재(50,52)의 위치 설정(positioning)은 골프 클럽 헤드(10)가 이 방정식을 만족하도록 한다; 도 12에 도시된 바와 같이, 보강 부재 구조체를 포함하지 않는 종래 기술의 골프 클럽 헤드들은 이 성능 메트릭(performance metric)에 크게 미치지 못한다.The golf club head 10 of the present invention comprises

, And more preferably

. Positioning of the reinforcement members 50, 52 of the present invention causes the golf club head 10 to satisfy this equation; As shown in Figure 12, prior art golf club heads that do not include a reinforcing member structure do not significantly outperform this performance metric.

In addition to optimizing the normalized ball speed of the golf club head 10, positioning the reinforcement members 50, 52 in the region of the golf club head 10 defined above provides the golf club head 10 with the greatest stress Exhibit a stress-reducing effect. When any one of the reinforcement members 50 and 52 is located more than an inch away from the rear surface 36 of the striking surface portion 30 the reinforcement members may be attached to the striking surface portion 30 when the golf club head 10 is in use. Will not be significantly affected by stress, and will use discretionary masses without providing significant performance advantages.

When the golf club head 10 is designed as a driver, the golf club head preferably has a volume of 200 cm 3 to 600 cm 3, more preferably a volume of 300 cm 3 to 500 cm 3, and most preferably 420 cm 3 And the most preferred volume is 460 cm < 3 >. In a preferred embodiment, the golf club head 10 has a volume of about 450 cc to 460 cc.

The volume of the golf club head 10 will also vary between fairway woods (preferably in the range of 3 woods to 11 woods) having a smaller volume than the driver. When designed as a driver, the golf club head 10 preferably has a mass of 215 g or less, and most preferably 180 to 215 g; When designed as fairway wood, the golf club head 10 preferably has a mass of 135 g to 200 g, and preferably a mass of 140 g to 165 g.

In each of the embodiments disclosed herein, striking surface portion 30 preferably has a variable thickness, such as that described in U.S. Patent No. 7448960 for a golf club head having a variable face thickness, Lt; / RTI > Another alternative embodiment of the thickness of striking surface 30 is disclosed in U. S. Patent No. 6,399, 866 to a golf club striking plate with variable thickness, U.S. Patent No. 6,471,603 to a contoured golf club face, U.S. Patent No. 6,368,234 to Golf Club Striking Plates having zones, all of which are owned by Callaway Golf Company, the relevant portions of which are incorporated herein by reference. Alternatively, the striking surface portion 30 may have a uniform thickness.

In each of the embodiments disclosed herein, the body 20 is preferably cast into molten metal in the same manner as the known lost-wax casting method. The casting metal is preferably a titanium or 6-4 titanium alloy, an alpha-beta titanium alloy or a titanium alloy such as a forging titanium alloy, and a casting 6-4 titanium. Alternatively, the body 20 is made of a 17-4 steel alloy. A further method for manufacturing the body 20 includes forming a body from a flat metal sheet, super-plastic forming the body from the flat metal sheet, removing the body 20 from the solid block of metal, Electrochemically milling the body 20 from a forged pre-form, casting the body using centrifugal casting, levitation casting, < RTI ID = 0.0 > Casting the main body 20 using the same, and similar manufacturing methods.

In other embodiments, the golf club head 10 may include a golf club head 10 as disclosed in U.S. Patent Nos. 6244976, 6332847, 6386990, 6406378, 6440008, 6471604, 6491592, 6527650, 6565452 , 6575845, 6478692, 6582323, 6508978, 6592466, 6602149, 6607452, 6612398, 6663504, 6669578, 6739982, 6758763, 6860824 No. 6,994,637, No. 7025692, No. 7070517, No. 7112148, No. 7118493, No. 7121957, No. 7125344, No. 7128661, No. 7163470, No. 7226366, No. 7252600, No. 7258631, 7314418, 7320646, 7387577, 7396296, 7402112, 7407448, 7413520, 7431667, 7438647, 7455598, 7476161, 7491134, 7497787 May have multiple material compositions such as those disclosed in U.S. Patent Nos. 5,754,995, 75,775,751, 77,178,17, 774,906, and 77,49097, each of which is incorporated herein by reference in its entirety It is hereinafter.

From the foregoing it will be appreciated by those of ordinary skill in the art that those skilled in the art may recognize the advancement of the present invention and that while the invention has been described in conjunction with the preferred embodiment thereof and other embodiments shown in the accompanying drawings, It will be readily understood that many variations, modifications and substitutions of equivalents may be made without departing from the spirit and scope of the present invention, and are not limited by the foregoing description, except as may appear in the appended claims below. Accordingly, embodiments of the present invention, which claim exclusive features or privileges, are defined by the following appended claims.

Claims (20)

A soul portion extending from a lower edge of the striking surface portion and a crown portion extending from an upper edge of the striking surface portion, the striking surface portion, the soul portion, and the crown portion defining a hollow body interior, ;
At least one reinforcing member disposed inside the hollow body and extending from the crown portion to the soul portion; And
A golf club head comprising a crown insert,
Wherein the striking surface portion includes a rear face surface facing toward the interior of the hollow body,
Wherein the at least one reinforcing member is disposed at a position less than one inch from the rear face surface along a vertical plane extending through a face center perpendicular to the striking face portion,
No part of the at least one reinforcing member comes into contact with the striking surface portion,
The crown portion including an upper opening,
Wherein the crown insert covers the upper opening,
Wherein the golf club head comprises:

, And

Golf club head. The method according to claim 1,
Wherein the golf club head comprises:

Of the golf club head. The method according to claim 1,
Wherein the at least one reinforcing member includes first and second reinforcing members, the first reinforcing member extends parallel to the second reinforcing member, and the first reinforcing member extends from 0.75 to 0. < RTI ID = 0.0 > A golf club head spaced 1.50 inches apart. The method of claim 3,
Wherein each of the first and second stiffening members comprises a structure selected from the group consisting of a solid rod and a hollow tube. 5. The method of claim 4,
Wherein each of the first and second reinforcing members is a solid rod composed of a metallic material selected from the group consisting of titanium alloy and steel. The golf club head of claim 1, wherein the at least one reinforcing member is disposed at a position less than 0.25 inches from the rear face surface along a vertical plane extending through a face center perpendicular to the striking face portion. The method according to claim 6,
Wherein the at least one reinforcing member includes an upper end proximate to the crown portion and a lower end adjacent the soul portion, the upper end is spaced a first distance from the rear face surface, the lower end is spaced a second distance from the rear face surface And the first distance is less than the second distance. The method according to claim 1,
The golf club head further comprising a cover piece, the soul portion including a plurality of cutouts, the cover piece being fixed to the soul portion and at least partially covering each of the plurality of cutouts. delete A return portion extending from an upper edge of the striking surface portion, the return portion and the soul portion defining an upper opening, and the striking surface portion, the soul portion, and the return portion define a striking surface portion, a soul portion extending from a lower edge of the striking surface portion, A metal body defining a hollow body interior;
First and second reinforcing members disposed in the hollow main body and extending from the return portion to the soul portion; And
A golf club head comprising a crown insert,
Wherein each of the first and second reinforcing members is a solid metal rod,
No part of the first or second reinforcing member is in contact with the striking surface,
The crown insert being permanently attached to the body to close the upper opening,
Wherein the golf club head comprises:

, And

Golf club head. delete 11. The method of claim 10,
Wherein the crown insert is comprised of a carbon composite material. 11. The method of claim 10,
Wherein each of the first and second reinforcing members is integrally cast with the main body. 11. The method of claim 10,
Carbon composite cover piece, the soul portion including at least one cutout, the cover piece being permanently attached to the soul portion to cover the at least one cutout. 11. The method of claim 10,
Wherein each of the first and second reinforcing members has a length of 1.00 to 2.50 inches, the first reinforcing member extends parallel to the second reinforcing member, and the first reinforcing member is extended from the second reinforcing member, 0.0 > 0.5 < / RTI > to 2.00 inches. 11. The method of claim 10,
Wherein the striking surface portion includes a face center and a rear face surface, and each of the first and second stiffening members is positioned at a position less than or equal to 0.500 inches from the rear face surface along a vertical plane extending through a face center perpendicular to the striking face portion The golf club head comprising: A return portion extending from an upper edge of the striking surface portion, and a rear end opposite to the striking surface portion, the return portion and the soul portion defining an upper opening, Wherein the striking surface portion, the sole portion, and the return portion define a hollow body interior, first and second stiffening members disposed in the hollow body and extending from the return portion to the sole portion, And a carbon composite crown insert permanently affixed to the body to close the upper opening,
Wherein each of the first and second stiffening members is positioned closer to the striking surface than the trailing end inside the hollow body, the golf club head having a volume of 420 cm to 470 cm 3,

, And

Golf club head. 18. The method of claim 17,
Wherein the first reinforcing member includes an upper end close to the return portion and a lower end close to the soul portion, the upper end is spaced apart from the striking surface portion by a first distance, and the lower end is distanced from the striking surface portion by a second distance- 2 The distance of the golf club head is greater than the first distance. 19. The method of claim 18,
Wherein the first distance is 0.120 inches to 0.150 inches and the second distance is 0.180 inches to 0.210 inches. 19. The method of claim 18,
Wherein each of the first and second reinforcing members has a length of 1.00 to 2.50 inches, the first reinforcing member extends parallel to the second reinforcing member, and the first reinforcing member extends from the second reinforcing member A golf club head spaced a distance of 0.75 to 1.50 inches.

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