JP2003265657A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head whose rebounding performance is improved. <P>SOLUTION: The golf club head comprises: a head base body B1 provided with a face 2, a crown extension part 9 connected with the crown side of this face 2, a sole extension part 10 connected with the sole side of the face 2, a toe-side flange part 11 extending to the rear face side of the head on the toe side of the face 2 and connected to the crown extension part 9 and the sole extension part 10, and a heel-side flange part 12 extending to the rear face side of the head on the heel side of the face 2 and connected to the crown extension part 9 and the sole side flange part 11; a toe-side member B2 which can be connected with the crown extension part 9, the sole extension part 10 and the toe-side flange part 11; and a heel-side member B3 which can be connected with the crown extension part 9, the sole extension part 10 and the heel-side flange part 12. A hosel 7 is formed at the heel-side member B3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head capable of improving resilience performance.

[0002]

2. Description of the Related Art In recent years,
In order to improve the flight distance of hit balls in golf competitions,
Improving the resilience performance of a golf club head has become an important issue. In general, in order to improve the resilience performance of the head, it is effective to configure the face portion or its peripheral portion to have low rigidity and to bend the face portion more greatly when hitting a ball.

FIG. 9A shows a front view of the golf club head a as described above, and FIG. 9B shows an exploded perspective view thereof. The golf club head a is composed of a face member a1 having a face portion b, and a head main body portion a2 fixed to the face member a1 by welding. The face member a1 includes a face portion b integrally provided with a crown side flange portion d1, a sole side flange portion d2, a toe side flange portion d3, and a heel side flange portion d4 which are bent and extend to the head back side at the peripheral edge e. There is. Therefore, the face member a1 is separated from the peripheral edge e of the face portion b toward the back side of the head by the head main body portion a2.
Can be welded with. In such a golf club head a, the repulsion performance is expected to be improved by moving the welded portion, which tends to become thick and thick due to the inclusion of molten metal, from the peripheral edge e of the face portion b to the back side of the head. Is.

However, in the golf club head a as described above, a cylindrical hosel f for inserting a shaft is provided on the face member a1, and the hosel f is integrally fixed to the back surface of the face portion b. There is. Therefore, there is a drawback that the rigidity of the face portion b is increased and the bending is reduced. Therefore, in such a head a, although the welded portion is moved to the back side of the head, not only the improvement of the resilience performance cannot be expected, but also the hosel f partially bends the heel portion of the face portion b. As a result, the sweet area j1 that should be originally obtained (repulsion coefficient at sweet spot (maximum repulsion coefficient)
On the other hand, it is a hitting point area on the face surface where the reduction in the coefficient of restitution is relatively small, and is usually 0.
It is defined as a region having a coefficient of restitution of 8 times or more. ) Becomes smaller as indicated by the symbol j2.

The present invention has been made in view of the above problems, and includes a crown extension extending to the face portion on the crown side, a sole extension extending to the sole side of the face portion, and a toe side of the face portion. With the toe side flange part that extends to the back side of the head and is connected to the crown extension part and the sole extension part, and the heel side flange part that extends to the back face side of the head on the heel side of the face part and that connects to the crown extension part and the sole extension part. A head base, a heel side member that can be coupled to the crown extension portion, the sole extension portion, and the heel side flange portion, and the face portion is effective based on forming a hosel on the heel side member. It is an object of the present invention to provide a golf club head which can improve the coefficient of restitution and increase the flight distance of a struck ball by bending the ball into a ball.

[0006]

According to a first aspect of the present invention, there is provided a golf club head having a hollow interior, the face portion being continuous with the crown side of the face portion and the upper edge of the face portion. Toe, crown extension between the heels, the width of which is smaller than the length of the crown face, the sole extension that extends to the bottom of the head continuously from the sole side of the face, and extends to the back of the head on the toe side of the face and extends the crown. Head base including a toe-side flange portion connected to the base portion and the sole extension portion, and a heel-side flange portion extending to the head back side on the heel side of the face portion and connected to the crown extension portion and the sole extension portion, the crown extension portion And a toe side member that can be coupled to the sole extension and the toe flange, as well as a crown extension, a sole extension and a heel side flange. Together comprising a heel-side member capable of binding to, it is characterized by the formation of the hosel to the heel side member.

As the head base, for example, an integrally molded product by casting can be used, and it is preferable that the crown extension and the sole extension are continuous on the back surface of the head. Further, the head base body can be connected by plastically deforming the plate-shaped material by forging or pressing, and welding the crown extension portion and the sole extension portion on the back surface of the head.

The toe-side flange portion has, for example, a face progression of 0.3 to 2.
It is desirable that the length of the heel side flange portion to the back surface of the head is 0.3 to 0.5 times the face progression.

Further, the toe side member or the heel side member is
It may be made of a metal material having a specific gravity larger than that of the head substrate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a golf club head (hereinafter, may be simply referred to as “head”) 1 according to the present embodiment in a normal state in which the golf club head 1 is placed on a horizontal plane HP at a prescribed lie angle and loft angle, and FIG. It is the front view seen from the face side.

In the figure, a head 1 includes a face portion 2 having a face surface 3 for hitting a ball, a crown portion 4 which is connected to an upper edge 2a of the face portion 2 to form a head upper surface, and a lower portion of the face portion. A sole portion 5 connected to the edge 2b and forming the bottom surface of the head, and a joint between the crown portion 4 and the sole portion 5 joins the toe side edge 2t of the face surface F to the heel side edge 2h of the face portion 2 through the back surface of the head. An example is one including a side portion 6 extending to the outside and a substantially cylindrical hosel 7 to which a shaft (not shown) is fixed.

The head 1 of this embodiment is exemplified by a wood type head made of a metal material and having a hollow inside. The wood type is not particularly limited, but the head volume is 260 cm ³ or more, more preferably 300 to 450.
It is desirable to form it as a large head of about cm ³ . This is preferable in that the ease of hitting can be improved, for example, the feeling of security at the time of holding can be increased and the moment of inertia can be increased. It is needless to say that the "hollow" means a hollow as a head shape, and the head may be configured by filling a foamed resin or the like in the hollow portion.

The face portion 2 has a horizontally long shape and has a crown face length Wu which is a horizontal length between the toe and heel of the upper edge 2a and a horizontal length between the toe and heel of the lower edge 2b. It is formed in a smooth trapezoidal shape larger than the sole face length Wd which is the length. Although not particularly limited, the thickness of the face portion 2 is, for example, 2.0 to
It is desirable that the thickness is about 4.0 mm, more preferably about 2.0 to 3.0 mm. This helps maintain a good balance between durability and low rigidity. Also, the hosel 7 is
The face portion 2, the crown portion 4, and the side portion 6 are formed in the vicinity of the position where they intersect on the heel side. This hosel 7
It has a shaft insertion hole 7a for inserting the shaft. Since the shaft insertion hole 7a substantially coincides with the axis center line of the shaft to be inserted later, when the head 1 is in the normal state, the shaft center line CL of the shaft insertion hole 7a is aligned with the vertical plane VP1. (Shown in FIG. 4) and is inclined at a specified lie angle β with respect to the horizontal plane HP.

The hosel 7 in this example is formed so as to project into the inside of the head (see FIG. 3). The hosel 7 is provided inside the head so as to be separated from the back surface of the face portion 2 and not to contact the back surface of the face portion 2 even when the face portion 2 is bent at the time of hitting a ball.

FIG. 3 is an exploded perspective view showing the head 1 of the present invention in a state before assembly (before welding), and FIGS.
FIG. 4 shows a plan view, a bottom view and a side view seen from the toe side of a temporarily assembled state in which each member is temporarily assembled before welding.
The head 1 of this embodiment includes a head base B1, a toe side member B2 welded to the toe side thereof, and the head base B1.
It can be configured with a three-piece structure including a heel side member B3 welded to the heel side.

The head base B1 is made up of the face portion 2
A crown extension 9 extending from the crown side of the face 2 to the back side of the head, a sole extension 10 extending from the sole side of the face 2 to the bottom of the head to the back side of the head, 2 extends to the back side of the head on the toe side with a small length and extends to the toe side flange portion 11 connected to the crown extension 9 and the sole extension 10 and on the heel side of the face portion 2 to the back side of the head with a small length. Moreover, the heel side flange portion 12 connected to the crown extension portion 9 and the sole extension portion 10 is integrally provided.

As shown in FIG. 4, the crown extension 9 of the present embodiment has a width Wa in the toe and heel directions which gradually decreases and extends to the back side of the head. Parts up to part 6 are shown. Thereby, the crown extension portion 9 occupies most of the crown portion 4 of the head 1. Further, as shown in FIG. 5, the sole extension portion 10 extends to the back side of the head while the minimum width Wb in the toe and heel directions of the sole portion 5 gradually decreases, and in this example, a side portion passing through the back surface of the head. Shown up to 6. The sole extension portion 10 also occupies most of the sole portion 5. In this example, the sole extension portion 10 is formed integrally with the crown extension portion 9 on the back side of the head via the narrow side piece 14 on the back side. As such 11, for example, an integrally molded product formed by casting including the lost wax method is preferably used.

Further, the toe side flange portion 11 is formed in a flange shape which joins the crown extension portion 9 and the sole extension portion 10 on the toe side and extends to the back side of the head by a small length and terminates. The heel side flange portion 12 has a flange shape that joins the crown extension portion 9 and the sole extension portion 10 on the heel side and extends to the back side of the head with a small length and terminates. As a result, the head substrate B1 of the present embodiment
As shown in FIG. 3, the toe side and the peripheral edge of the face portion 2 (the peripheral edge including the upper edge 2a, the lower edge 2b, the toe side edge 2t, and the heel side edge 2h are thus referred to as "periphery"). A toe-side opening O1 is formed on the back side of the head with respect to E, and a heel-side opening O2 is formed on the back side of the head with respect to the heel side and the peripheral edge E of the face portion 2. Therefore, the head base body B1 is welded to other members on the head rear surface side of the peripheral edge E of the face portion 2 by the crown extension portion 9, the sole extension portion 10, the toe side flange portion 11 and the heel side flange portion 12 so as to form a welded portion. It will be equipped.

Since the head substrate B1 includes the face portion 2 for hitting a ball, it is desirable that the head substrate B1 be made of a metal material having excellent resilience and strength. Specifically, titanium, titanium alloy, stainless steel, maraging steel, aluminum alloy and the like are suitable. When using an integrally molded product by casting as in this example, Ti-6A suitable for casting is used.
An α + β type titanium alloy such as 1-4V is particularly preferable.

The toe side member B2 is, as shown in FIG.
A toe-side crown piece 16 that constitutes a toe-side small area of the crown portion 4, a toe-side sole piece 17 that constitutes a toe-side small area of the sole portion 5, and a part of the side portion 6 that connects between them. 1 shows a curved plate-shaped body integrally provided with a toe side 18 forming a part. The toe side member B2 is welded to the toe side opening O1 of the head base B1.

The toe side member B2 can be formed of various metal materials like the head base body B1 and has a relatively simple shape. Therefore, for example, the toe side member B2 can be formed by plastic working such as pressing or forging in addition to the casting. Can be easily formed.
The toe-side member B2 may be formed of the same metal material as that of the head base B1, or may be formed of a metal material having a specific gravity larger or smaller than that of the head base B1. In the former case, the center of gravity of the head 1 can be moved to the toe side. Further, in this case, the weight at a position distant from the center of gravity of the head to the toe side can be increased, which also serves to increase the moment of inertia of the head 1, which is preferable in that the degree of freedom in designing the center of gravity can be increased. .

The heel side member B3 is welded to the heel side opening O2 to form a small heel side crown portion 19 of the crown portion 4.
A heel side sole piece 20 that constitutes a small area on the toe side of the sole portion 5, a heel side side piece 21 that connects between these and forms a part of the side portion 6, and the hosel 7 It is composed of The heel side member B3
Like the toe-side member B2 and the head base B1, it can be formed of various metal materials, and can be easily formed by, for example, casting, pressing or forging, or a combination thereof.

The heel side member B3 also includes the head base body B1.
In addition to the case of using the same metal material as described above, it is also preferable to use a metal material having a specific gravity larger or smaller than that of the head base body B1. For example, when the specific gravities of the metal materials forming the head base B1, the toe side member B2, and the heel side member B3 are ρ1, ρ2, and ρ3, the following combinations of materials are possible. ρ1 = ρ2 = ρ3 ρ1 <ρ2 = ρ3 ρ1 <ρ2 <ρ3 ρ1 = ρ2 <ρ3 ρ1> 2 = ρ3 ρ1>ρ2> ρ3 ρ1 = ρ2> ρ3 ρ1> ρ2 <ρ3 ρ1 <ρ2> ρ3

In the case of any of the above or combinations, the head 1
It is possible to move the center of gravity of the to the heel side.
Since such a head 1 can reduce the distance of the center of gravity, the head return can be improved. This is especially true for average golfers with slow head speeds, where the hit ball is to the right (the same applies to right-handed golfers).
It is possible to effectively prevent slippage. Further, in the case of the above or combinations, it becomes possible to bring the center of gravity of the head 1 closer to the toe side. In such a head 1, the head return is rather deteriorated by increasing the distance of the center of gravity. This can effectively prevent the hit ball from shifting to the left, especially in a professional golfer or an advanced golfer who has a fast head speed and has a good head return.

Further, in the case of the above combination, the weight at the positions separated from the center of gravity of the head to the toe side and the heel side can be large, and as a result, the moment of inertia of the head 1 in the left-right direction is increased, and the sweet spot is removed to play the ball. Even when hit, it helps reduce head shake and stabilizes the direction. More preferably, in the normal state, the left and right moments of inertia about the vertical axis passing through the center of gravity of the head are set to 3000.
~ 5000 g · cm ² , more preferably 3500-450
It is desirable to set it to about 0 g · cm ² .

Then, as shown in FIG. 1, the head substrate B
1, the toe side member B2 and the heel side member B3 are integrally formed by welding.
Is further moved away from the peripheral edge E of the face portion 3 toward the back side of the head, thereby preventing the welded portion J from increasing the rigidity in the vicinity of the peripheral edge of the face portion 2. Further, in the head 1 of the present invention, since the hosel 7 is provided not on the head base body B1 but on the heel side member B3, it is also possible to prevent the face portion 2 from becoming highly rigid due to the hosel 7. Therefore, by effectively deflecting the face portion 2 at the time of hitting a ball, the resilience performance is enhanced and it is useful for increasing the flight distance of the hit ball.

Further, in the conventional head shown in FIG. 9, since the crown portion 4 and the sole portion 5 are formed with welded portions (not shown) extending in the direction perpendicular to the stress transmitting direction X,
At the time of hitting the ball, the welded portion restricts the deflection, which reduces the overall deflection of the head. On the other hand, as in the present embodiment, the crown extension 9 and the sole extension 10 that continuously extend from the upper edge 2a and the lower edge 2b of the face portion 2 to the side portion 6 on the back side of the head on the head base body B1. By disposing a welded portion extending in a direction perpendicular to the stress transmission direction X (shown in FIG. 4) in the crown portion 4 and the sole portion 5, the entire head base body B1 uniformly receives and bends the stress when the ball is hit. It becomes possible. Therefore, the coefficient of restitution of the head 1 can be further increased, and stress concentration can be prevented to improve durability.

The crown extension 9 does not necessarily have to reach the side portion 6 on the head back side, but as shown in FIG. 6, the horizontal length La from the upper edge 2a of the face portion 2 to the head back side. Is too small, the welded part will be
And tends to impair the deflection of the head when hitting the ball.
From such a point of view, it is preferable that the length La of the crown extension portion 9 is at least 0.6 times or more the crown length L1 from the upper edge 2a of the face portion 2 to the back surface of the head, and more preferably. Is 0.7 times or more, more preferably 0.8 to 1.0 times (in this example, 1.0 times is shown).

Similarly, the sole extension portion 10 does not need to reach the side portion 6 on the head back side, but if the horizontal length Lb from the lower edge 2b of the face portion 2 to the head back side is too small, welding is performed. The portion is close to the lower edge 2b of the face portion 2 and tends to impair the deflection of the head. Therefore, preferably, the length Lb of the sole extension 10 is at least 0.6 times or more, more preferably 0.7 times or more, more preferably 0.7 times or more of the sole length L2 from the lower edge 2b of the face portion 2 to the back surface of the head. Is preferably 0.8 to 1.0 times (in this example, 1.0 times is shown).

The crown extension portion 9 of the head base B1 has a minimum width Wa in the toe and heel directions of the crown portion 4 of 0.30 to the crown face length Wu.
It is desirable to set it to about 0.85 times, more preferably about 0.40 to 0.80 times. If the width Wa is less than 0.30 times the crown face length Wu, the crown extension portion 9 tends to be downsized and the stress load on the narrow width portion tends to increase. Conversely, if it exceeds 0.85 times. The toe side member B2 or the heel side member B3 tends to be downsized.
When the toe side member B2 and / or the heel side member B3 are downsized, the effect of designing the center of gravity tends to be insufficient when the head 1 is made of a material having a specific gravity different from that of the head base body B1, for example. There is. The sole extension portion 10 is not particularly limited, but it is desirable that the minimum width Wb in the toe and heel directions of the sole portion 5 be set to a dimension approximately the same as the width Wa.

As shown in FIG. 4, if the minimum length Lc to the back side of the head is too small, the toe side extension 11 has a sufficient effect of moving the welded part away from the back side of the head at the toe side. On the contrary, if it is too large, the shape becomes complicated and molding becomes difficult, and the degree of freedom in designing the center of gravity tends to be impaired. From such a viewpoint, the length Lc of the toe side extension 11 from the toe side edge 2t to the head back surface side is 0.30 to 2.50 times the face progression FP, more preferably 0.35.
It is desirable to be ˜2.00 times. Also for the heel-side extension 12, the minimum length Ld from the heel-side edge 2h of the heel-side extension 12 to the back side of the head is 0.30 of the face progression FP for the same reason as the toe-side extension 11. ~ 0.50 times, more preferably 0.35
It is desirable to set it up to 0.45 times. The face progression FP is the axis center line CL of the hosel 7 in a plan view with the head 1 in a normal state as shown in FIG.
Is the horizontal distance from the vertical surface VP1 where is located to the most protruding position of the lower edge 2b of the face portion 2.

In FIGS. 7A to 7D, the head substrate B1 is shown.
An example of forming by using a plastic working method such as forging or pressing will be shown. First, as shown in FIG. 7A, first, a material piece 30 for forming the head base body B1 is die-cut from a plate material such as a rolled material by punching or the like. Next, a disassembled assembly core 31 is arranged on the material piece 30, and bending is performed by pressing or forging along the assembly core 31 so as to surround the core. And
As shown in FIG. 7C, a crown extension portion 9, a sole extension portion 10, a toe side flange portion 11 and a heel side flange portion 12 are formed. Thereafter, the assembly core 31 is disassembled and taken out from the toe side or the sole side, and the joint portion where the crown extension portion 9 and the sole extension portion 10 face each other so as to be continuous on the head rear surface side as shown in FIG. 7D. 32 is welded and integrated. It should be noted that the assembly core 31 may not be provided, and the assembly core 31 may be formed mainly by bending using a mold or the like.

With such a molding method, although not suitable for casting, it is possible to form the head substrate B1 having a complicated shape by using a β-type titanium alloy having a very high strength and capable of being thinned. It is preferable in that Also, when forging is used, there are few casting defects as seen in cast products, a homogeneous and dense crystal structure is obtained, variations in mechanical properties such as strength and hardness are reduced, and in addition to the product shape Grain flow lines (metal flows) are obtained, and the strength is increased against repeated bending stress, which is preferable in that the quality level can be improved.

Further, in this embodiment, when the head base B1 is formed, the crown extension 9 and the sole extension 10 are formed.
Will be welded on the back side of the head, and a welded portion extending in a direction perpendicular to the stress transmission direction X at the time of hitting a ball will be formed. However, the position of the welded portion is most distant from the face portion 2 toward the back side of the head. Therefore, even if the welded portion is formed, the malfunction that occurs when the deflection of the entire head is impaired does not substantially occur. Therefore, it is possible to realize the high resilience which is almost the same as that of the head base B1 shown in FIG.

FIG. 8 shows still another embodiment of the head 1 of the present invention. In this embodiment, the head 1 has a four-piece structure including a head base body B1, a toe side member B2, a heel side member B3, and a back member B4. The head base body B1 of the present embodiment includes the crown extension portion 9
The sole extension portion 10 has an upper end portion 9e and a lower end portion 10e which both terminate near the side portion 6 on the back surface of the head. The back member B4 includes the upper end 9e and the lower end 1 of the head base B1.
0e and is welded integrally with them. For this reason, also in this form, a weld portion extending in a direction perpendicular to the stress transmission direction X at the time of hitting a ball is formed, but the position thereof is substantially the ridge line portion between the side portion 6 and the crown portion 4, and Since it becomes the ridge line portion of the side portion 6 and the sole portion 5 and is largely separated from the face portion 2, the deterioration of the deflection of the entire head is extremely limited. Therefore, higher resilience can be achieved as compared with the conventional head.

The head 1 can be constructed in various forms. For example, the head 1 may be further changed from the form shown in FIG. 8 and, for example, the toe side member B2 and the back member B4 may be preliminarily formed constant. Further, the heel side member B3 and the back member B4 can be integrally formed. Furthermore, the toe side member B2 and the heel side member B3 can be embodied in various forms, such as one integrally cast through the back member B4.

[0037]

EXAMPLES Examples in which the present invention is embodied will be described below. A wood type golf club head was prototyped based on the specifications in Table 1, the coefficient of restitution and the moment of inertia were measured, and the performance was compared. In Example 1, the head base was formed by casting, and the crown extension and the sole extension were connected. In Example 2, the head substrate was formed by the method shown in FIG. 7, and the crown extension portion was connected to the back surface of the head. Further, in Comparative Example 1, a sole plate was welded to a head body having a sole opening as shown in FIG. 10, and Comparative Example 2 was a head of the type shown in FIG. As common specifications, the head volume was 320 cm ³ , the loft angle was 10 °, the shaft length was 46 inches, the central thickness of the face portion was 2.7 mm, and there was no face line. The test method is as follows.

<Repulsion coefficient> S. G.
A. Procedure for Measuring the Velocity Ratio
of a Club Head for Conformance to Rule 4-1e, Revi
It was conducted based on sion 2 (February 8, 1999). Specifically, a golf ball is shot by using a ball launching device and is made to collide with a sweet spot on a face portion of a head mounted without being fixed on a pedestal, and an incident velocity Vi and a rebound velocity immediately before the collision of the golf ball. Measure Vo and. Then, the incident speed of the golf ball is Vi and the bounce speed is V
The coefficient of restitution e was calculated by the following equation, where o, the mass of the head is M, and the average mass of the golf ball is m. The larger the value, the better. (Vo / Vi) = (eM-m) / (M + m) The distance from the launch port of the golf ball to the face part is 55 inches, and the ball is not more than 5 mm away from the head sweet spot position and the face surface is Make a right-angled collision with. The golf ball uses Pinnacle Gold made by Titleist, and the initial ball speed is 160
Feet ± 0.5 feet (48.768 ± 0.152
m / s).

<Inertia Moment> The inertia moment is defined by the left and right inertia moments about the vertical axis passing through the center of gravity with the head in the normal state, and the upper and lower inertia moments about the horizontal axis extending in the toe and heel directions. INERT respectively
MOMENT OF INERTIA MEASURING made by IA DYNAMICS Inc
It measured using INSTRUMENT MODEL NO.005-002. The larger the value, the smaller the blurring of the head when hitting the ball with the sweet spot removed, and the better. Table 1 shows the test results and the like.

[0040]

[Table 1]

As a result of the test, it can be confirmed that the head of the example has a higher coefficient of restitution than the comparative examples 1 and 2. It is considered that this is because the welded portion of the member was closer to the back side of the head, and was further displaced in the toe and heel directions. In addition, the welded part, which is thicker and heavier, is closer to the toe and heel directions, so an increase in the moment of inertia on the left and right is also observed, and a good head was obtained.

[0042]

As described above, according to the first aspect of the invention, the head base body having the face portion has the crown extension portion and the sole extension portion extending to the back surface side of the head, and the toe side and the heel side thereof. Is provided with a toe-side flange portion and a heel-side flange portion that extend to the head back surface side, respectively, so that the coupling position with the toe-side member and the heel-side member can be moved away from the face portion to the head back surface side. In particular, in the crown portion and the sole portion where the impact force at the time of hitting the ball is great, it is possible to keep the crown portion and the sole portion farther than the toe and heel sides by the both extension portions. As a result, it is possible to improve the resilience performance by preventing the decrease in the bending due to the approaching position of the members approaching the face portion. Therefore, a head having excellent flight distance performance can be provided.

Further, the hosel is provided not on the head base having the face portion but on the heel member which is a separate member. As a result, the rigidity of the face member can be suppressed from being higher than that of the hosel integrally formed on the back surface of the face portion. Therefore, the deflection of the face portion at the time of hitting the ball can be maximized, and the reduction of the sweet area can be effectively prevented.

Further, in the head base according to the present invention, when the crown extension portion and the sole extension portion are continuous on the back surface of the head, the head impact force transmitted from the face surface to the back surface of the head at the time of hitting the ball. Can be effectively bent and received by the long crown extension and sole extension, and the resilience performance can be further improved. Further, even when the crown extension and the sole extension are welded on the back surface of the head as described in claim 3, the welding position is the farthest position from the face surface, so that the resilience performance can be effectively improved. In particular, when the crown extension and the sole extension are integrally connected by casting as in the second aspect of the present invention, there is no welded portion, so the resilience performance can be further improved.

Further, when the length of the toe side flange portion and the heel side flange portion to the back surface of the head is limited in accordance with the face progression, the head repulsion performance can be further effectively improved. Can be improved.

When the toe side member or the heel side member is made of a metal material having a specific gravity larger than that of the head base, the center of gravity is easily moved to the toe side or the heel side. This helps increase the degree of freedom in designing the center of gravity of the head.

[Brief description of drawings]

FIG. 1 is a perspective view of a head in a normal state showing an embodiment of the present invention.

FIG. 2 is a front view thereof.

FIG. 3 is an exploded perspective view of a head.

FIG. 4 is a plan view showing a temporary assembled state of the head before welding.

FIG. 5 is a bottom view thereof.

FIG. 6 is a side view of FIG. 4 viewed from the toe side.

7A to 7D are perspective views illustrating another method for forming a face member.

FIG. 8 is an exploded perspective view of a head showing another embodiment of the present invention.

FIG. 9A is a front view illustrating a conventional head,
(B) is an exploded perspective view thereof.

FIG. 10 is a perspective view of a head of a comparative example.

[Explanation of symbols]

1 golf club head 2 face part 2a Upper edge 2b lower edge 2t toe side edge 2h heel side edge 3 face 4 Crown 5 sole part 6 side part 7 Hosel 7a Shaft insertion hole 9 Crown extension 10 Sole extension 11 Toe side extension 12 Heel side extension B1 head substrate B2 toe side member B3 heel side member CL hosel centerline

Claims (6)

[Claims] 1. A golf club head having a hollow interior, wherein a face portion is continuous with the crown side of the face portion, and a crown extension having a width smaller than a crown face length between a toe and a heel of the upper edge of the face portion. Section, a sole extension extending to the sole bottom of the face and extending to the bottom surface of the head, a toe flange extending to the back of the head on the toe side of the face and extending to the crown extension and the sole extension, and a face Head base that extends toward the back side of the head on the heel side and that has a heel side flange portion that is continuous with the crown extension portion and the sole extension portion, and the toe side that can be coupled to the crown extension portion, the sole extension portion, and the toe side flange portion. A member, and a heel side member that can be coupled to the crown extension portion, the sole extension portion, and the heel side flange portion, and The golf club head obtained by forming a hosel Lumpur side member. 2. The golf club head according to claim 1, wherein the head base is made of an integrally molded product by casting, and the crown extension and the sole extension are continuous on the back surface of the head. 3. The golf club according to claim 1, wherein the head base is formed by plastically deforming a plate-shaped material by forging or press working, and joining the crown extension and the sole extension on the back surface of the head. head. 4. The golf club according to claim 1, wherein the toe-side flange portion has a length to the back surface of the head which is 0.3 to 2.5 times the face progression. head. 5. The golf club according to claim 1, wherein a length of the heel side flange portion toward the back surface of the head is 0.3 to 0.5 times the face progression. head. 6. The golf club head according to claim 1, wherein the toe side member or the heel side member is made of a metal material having a specific gravity larger than that of the head base body.