JP2003310804A - Metallic wood club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic wood club whose back metal member and wood club head main body are surely fitted by a simple method, which is deep in gravity depth and which has a wide sweet spot. <P>SOLUTION: In order to fit the back metal member 2 which has a specific gravity larger than that of the wood club head main body 1 to the back part of a hollow metallic wood club head, a protrusion 4 is formed on a joint surface 31 on the side of the wood club head main body 1, and a recess part 5 to be fitted to the protrusion 4 is formed on a joint surface 32 on the back metal member 2. After fitting the wood club head main body 1 and the back metal member 2 to each other, the back metal member 2 is fixed to the wood club head main body 1 with a screw reaching the wood club head main body 1 from the back metal member 2. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to design the center of gravity of a metal wood club head at the most preferable position.

[0002]

2. Description of the Related Art Metal wood club heads manufactured in recent years include those made by casting such as the lost wax method, and the head as a whole divided into 2 to 4, and the outer shell member constituting each is pressed or pressed. A metal wood club head is known in which these members are joined by welding or the like after being formed by forging.

In such a metal wood club head, since there is no difference in specific gravity between the crown portion, face portion, back portion, side portion and the like, the head shape and each of them are exclusively set for the optimum center of gravity. It depended on how to design the thickness of each part. However, in casting, there was a limit to making an extreme difference in wall thickness change between the respective parts due to the problem of castability (melting area). In forging, it was very difficult to control the fine wall thickness.

The optimum position of the center of gravity is preferably such that the depth of the center of gravity is deep (that is, the position of the center of gravity is far from the face surface), and the position of the center of gravity is low (close to the sole surface). ing. This is because the sweet spot becomes wider as the depth of the center of gravity becomes deeper, and as the position of the center of gravity becomes lower, the sweet spot and the hitting point of the ball come closer to each other, and the ball easily goes up.

[0005]

As a method for deeply designing the depth of the center of gravity, a member having a different specific gravity, which has been adopted in the era of the conventional Persimmon wood club head, is attached to the rearmost portion of the head as a back metal (back weight). Can be considered. However, as in the era of Persimmon head, by simply screwing the back metal member to the metal wood club head body, it is a joint between metals, so it is not possible to withstand the impact at the time of collision between the ball and the head, There is a problem that a gap or a gap is generated between the back metal member and the wood club head body.

Therefore, according to the present invention, the back metal member and the wood club head main body are securely fitted together by a simple method, and when completed as a wood club head, the depth of the center of gravity becomes deep, and a metal having a wide sweet spot is formed. It is what the wood club head is trying to provide.

[0007]

According to a first aspect of the present invention, in attaching a back metal member having a specific gravity larger than that of the wood club head body to the back portion of the hollow metal wood club head, the wood club head body is attached. A protrusion is provided on the joint surface on the side, and a first recess that fits into the protrusion is formed on the joint surface of the back metal member .
After the second recesses are provided on both sides to fit the wood club head body and the back metal member, the back metal member is screwed to the wood club head body with a screw from the back metal member to the wood club head body. It is a metal wood club head fixed to the head body.

According to a second aspect of the present invention, in the first aspect of the present invention, the protrusion of the joint surface on the main body side of the wood club head is a metal wood club head having a shape other than a perfect circle.

According to a third aspect of the present invention, in the invention according to any one of the first and second aspects, the peripheral edge of the protrusion of the joint surface on the main body side of the wood club head is more than that of the plane forming the joint surface. A metal wood club head with a groove that is one step lower.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the sole member of the wood club head main body has a specific gravity larger than that of the wood club head main body excluding the sole member. It is a metal wood club head made of the material. The present invention relates to a structure for fixing a head body and a face member to each other so as not to reduce the resilience performance, in a metal golf club, which is composed of a head body and a face member that is a member separate from the head body, particularly an iron club. Is.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the back weight member is a copper alloy, a nickel alloy, a cobalt alloy, or stainless steel.
Or a tungsten alloy, the sole member is a metal wood club head is a cobalt alloy, copper alloy, nickel alloy, stainless steel or tongue <br/> stainless alloy.

[0012]

1 is a cross-sectional view of a hollow metal wood club head body 1 fitted with a back metal member 2 taken along a plane substantially parallel to the sole surface. FIG. 2A shows the joint surface 31 of the wood club head body 1 as viewed from the back side, and FIG.
FIG. 3 is a cross-sectional view of the wood club head body 1. Figure 3
FIG. 3A is a view of the back metal member 2 viewed from the back side, FIG. 3B is a cross-sectional view of the back metal member 2, and FIG. Face 32
It is the figure seen from the side.

The back metal member 2 is made of a material having a larger specific gravity than the wood club head body 1. Specifically, a copper alloy, a nickel alloy, a cobalt alloy, stainless steel, a tungsten alloy, or the like is used. The material of the wood club head body 1 is titanium, titanium alloy, aluminum alloy, magnesium alloy, stainless steel or the like.

As shown in FIGS. 1 and 2, a protrusion 4 is provided on the joint surface 31 of the wood club head body 1. On the other hand, as shown in FIG. 1 or 3, the joint surface 32 of the back metal member 2 is provided with a recess 5 that fits into the protrusion 4. Then, after the wood club head body 1 and the back metal member 2 are fitted together, screws (not shown) from the back metal member 2 to the wood club head body 1 are transferred from the back metal member 2 to the wood club head body 1. Hole 6
The back metal member 2 is fixed to the wood club head body 1 by passing through 2 to 61. If the head of the inserted screw is cut along the outer periphery of the back weight member 2, the appearance will be improved.

If the projection 4 of the joint surface 31 of the wood club head body 1 is formed in a shape other than circular, when the back metal member 2 is fitted to the wood club head body 1 and the present golf club is used. Therefore, the back metal member 2 is prevented from rotating due to the impact. Protrusion 4
Can be oval, square, rectangular, rhombic, etc. In FIG. 2, the shape is substantially rectangular, but if such a linear shape is adopted and fitting is not possible because it does not match the shape of the concave portion 5 of the back metal member 2, it is possible to relatively cut the peripheral edge of the protruding portion 4. It is possible to fit them easily.

As shown in FIG. 2, the peripheral edge of the protrusion 4 of the joint surface 31 of the wood club head body 1 is set as a groove 7 which is one step lower than the plane forming the joint surface 31. Even if the angle formed between the side surface of the protruding portion 4 and the joint surface 31 is designed to be 90 °, in actual products, this portion often has a gentle rounded shape. Therefore, when the back metal member 2 is fitted to the projection 4 of the wood club head body 1, the projection 4 is not completely fitted in the recess 5 of the back metal member 2, and the joint surface 32 of the back metal member 2 is not formed.
May float from the joint surface 31 of the wood club head body 1.

As shown in FIG. 2, the wood club head body 1
If the peripheral edge of the protrusion 4 of the joint surface 31 is formed as a groove that is one step lower than the plane forming the joint surface 31, the radius formed by the side surface of the protrusion 4 and the joint surface 31 is not rounded, and the wood club head body 1 Since the joint surface 31 of 1 and the joint surface 32 of the back metal member 2 are closely fitted to each other, it is not necessary to perform post-processing so that the angle formed between the side surface of the protrusion 4 and the joint surface 31 is exactly 90 °.

As shown in FIGS. 1 to 3, after the wood club head body 1 and the back metal member 2 are fitted, the back metal member 2 is passed through the screws from the back metal member 2 to the wood club head body 1. It is fixed to the wood club head body 1. 1 to 3, the protrusion 4 of the wood club head main body 1 extends from the center of the back metal member 2.
Holes 62 and 61 are opened in the center of the screw so that one screw is passed through and fixed, but the position and the number of screws are not limited to this embodiment.

For example, holes may be formed at two locations on the left and right of the protrusion 4 (including the back metal member 2 corresponding thereto), or holes may be formed at two locations by removing the protrusion 4. .
Of course, holes may be formed in two or more places. By inserting screws into the holes, the head of the screws after fixing the back metal member 2 to the wood club head body 1 can be trimmed along the outer circumference of the back weight member 2 to improve the appearance.

With the above structure, a golf club having a deep center of gravity can be provided. Furthermore, if the sole member is made of a material having a specific gravity larger than that of the wood club head body excluding the sole member, the position of the center of gravity is lowered, and the sweet spot and the hitting point of the ball come closer to each other, which makes it easier to climb the ball. Therefore, it is possible to provide a preferable golf club to the player. As the sole member having a large specific gravity, cobalt alloy, copper alloy, nickel alloy, stainless steel, tungsten alloy or the like can be used.

[0021]

Since the present invention is constructed as described above,
The back metal member 2 can be easily and firmly fixed to the wood club head body 1 in spite of the combination of metals. Therefore, the back metal member 2 and the wood club head body 1 do not endure the impact at the time of the collision between the ball and the head, and there is no gap or gap.

In particular, if the projection 4 of the joint surface 31 on the side of the wood club head body 1 is formed in a shape other than a perfect circle, the gap or gap between the back metal member 2 and the wood club head body 1 can be more reliably achieved. Can be prevented. Further, if the peripheral edge of the protrusion 4 of the joint surface 31 on the side of the wood club head body 1 is set as the groove portion 7 that is one step lower than the plane forming the joint surface 31, the joint surface 32 of the back metal member 2 and the wood club head body 1 are formed. It is possible to form a perfect joint with the joint surface 31 of.

Since the back metal member 2 is made of a material having a large specific gravity such as a copper alloy, a nickel alloy, a cobalt alloy, a stainless steel, or a tungsten alloy, the depth of the center of gravity becomes deep, and the golf club head made of metal having a wide sweet spot. Becomes Furthermore, if the sole member is made of a material such as cobalt alloy, copper alloy, nickel alloy, stainless steel, or tungsten alloy material having a specific gravity larger than that of the wood club head body excluding the sole member, the center of gravity is lowered, and the sweet spot and the ball are It is possible to provide a golf club that is suitable for the player.

[Brief description of drawings]

FIG. 1 is a lateral cross-sectional view of a main part of a wood club head embodying the present invention.

FIG. 2A is a front view of a joint surface of a wood club head main body, and FIG. 2B is a cross-sectional view of the wood club head main body.

3A is a rear view of the back metal member on the side opposite to the bonding surface, FIG. 3B is a cross-sectional view, and FIG. 3C is a front view of the bonding surface.

[Explanation of symbols]

1 Wood club head body 2 Back metal member 31 Bonding surface 32 joining surface 4 protrusion 5 recess 61 holes 62 holes 7 groove

Claims (5)

[Claims] 1. When attaching a back metal member having a heavier specific gravity than the wood club head body to a back portion of a hollow metal wood club head, a protrusion is provided on a joint surface of the wood club head body side. A first recess that fits into the protrusion and a second recess on both sides of the first recess are provided on the joint surface of the back metal member to fit the wood club head body and the back metal member. After that, a metal wood club head in which the back metal member is fixed to the wood club head body with a screw from the back metal member to the wood club head body. 2. The metal wood club head according to claim 1, wherein the projection on the joint surface on the main body side of the wood club head has a shape other than a perfect circle. 3. The metal wood according to claim 1, wherein the peripheral edge of the protrusion on the joint surface on the main body side of the wood club head is a groove portion that is one step lower than the plane forming the joint surface. Club head. 4. The metal according to claim 1, wherein the sole member of the wood club head main body is made of a material having a specific gravity larger than that of the wood club head main body excluding the sole member. Wood club head. Wherein said back the weight member is a copper alloy, nickel alloy, cobalt alloy, a stainless steel or tungsten <br/> emissions alloy, the sole member of the cobalt alloy, copper alloy, nickel alloy, stainless or tungsten alloy The metal wood club head according to any one of claims 1 to 4.