JP2000037482A - Metal wood club head - Google Patents

Abstract

(57) [Problem] To provide a metal wood club head having a deep center of gravity and a wide sweet spot while securely fitting a back metal member and a wood club head body by a simple method. SOLUTION: When attaching a back metal member 2 having a higher specific gravity than the wood club head body 1 to a back portion of a hollow metal wood club head, a projection 4 is formed on a joint surface 31 on the wood club head body 1 side. Is provided on the joint surface 32 of the back metal member 2 so as to fit into the projection 4. After the wood club head main body 1 and the back metal member 2 are fitted together, The back metal member 2 is fixed to the wood club head main body 1 with screws reaching the head main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to designing a center of gravity position of a metal wood club head to a most preferable position.

[0002]

2. Description of the Related Art In recent years, metal wood club heads manufactured by casting such as a lost wax manufacturing method and the like are divided into two to four heads. A metal wood club head formed by forging and then joining these members by welding or the like is known.

In such a metal wood club head, since there is no difference in specific gravity between the crown, face, back, and side portions, the shape of the head and the shape of each head are exclusively used to obtain the optimum center of gravity. It depended on how to design the wall thickness of each part. However, in casting, there is a limit to providing an extreme difference in wall thickness for each part due to the problem of castability (running). In forging, it was very difficult to control fine wall thickness.

The optimum position of the center of gravity is considered to be better when the depth of the center of gravity is deeper (that is, the position of the center of gravity is farther from the face surface), and it is better when the position of the center of gravity is lower (closer to the sole surface). ing. This is because the sweet spot becomes wider as the depth of the center of gravity becomes deeper, and the sweet spot becomes closer to the ball hitting point as the position of the center of gravity becomes lower, so that the ball is more likely to rise.

[0005]

As a method of deeply designing the depth of the center of gravity, a member having a different specific gravity used in the era of the conventional Persimmon wood club head is attached to the rear end of the head as a back metal (back weight). Can be considered. However, just like the Persimmon head era, simply screwing the back metal member to the metal wood club head body is a joint between metals, so it can not withstand the impact at the time of collision between the ball and the head, There has been a problem that a gap or a gap occurs between the back metal member and the wood club head body.

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

[0007]

According to the first aspect of the present invention, when a back metal member having a higher specific gravity than the wood club head body is attached to a back portion of a hollow metal wood club head, the wood club head body is provided. A projection is provided on the joining surface on the side, and a recess is provided on the joining surface of the back metal member so as to be fitted to the projection, and after the wood club head body and the back metal member are fitted, 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.

According to a second aspect of the present invention, there is provided the metal wood club head according to the first aspect of the present invention, wherein the protrusion on the joining surface of the wood club head body has 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 to second aspects, the periphery of the projection on the joining surface on the side of the wood club head main body is larger than a plane constituting the joining surface. This is a metal wood club head with a lower groove.

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 body has a specific gravity larger than the specific gravity of the wood club head body excluding the sole member. This is a metal wood club head made of the above material.

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 made of a copper alloy, a nickel alloy, a cobalt alloy, a stainless steel, a tungsten alloy, or the like. Is a metal wood club head made of a cobalt alloy, a copper alloy, a nickel alloy, a stainless steel, a tungsten alloy or the like.

[0012]

FIG. 1 is a cross-sectional view of a hollow metal wood club head body 1 fitted with a back metal member 2 cut along a plane substantially parallel to a sole surface. FIG. 2A shows the joining surface 31 of the wood club head main body 1 as viewed from the back side, and FIG.
FIG. 2 is a cross-sectional view of the wood club head body 1. FIG.
3A is a view of the back metal member 2 as 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 higher specific gravity than the wood club head body 1. Specifically, a copper alloy, a nickel alloy, a cobalt alloy, a stainless steel, a tungsten alloy, or the like is used. The material of the wood club head body 1 is titanium, a titanium alloy, an aluminum alloy, a magnesium alloy, stainless steel, or the like.

As shown in FIGS. 1 and 2, a projection 4 is provided on a joint surface 31 of the wood club head main body 1. On the other hand, as shown in FIG. 1 or FIG. 3, the joint surface 32 of the back metal member 2 is provided with a concave portion 5 fitted to the protrusion 4. After fitting the wood club head body 1 and the back metal member 2, 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 to reach
The back metal member 2 is fixed to the wood club head main body 1 through 2 through 61. If the head of the inserted screw is cut along the outer periphery of the back weight member 2, the appearance of the appearance is improved.

If the projection 4 of the joining surface 31 of the wood club head main body 1 is formed in a shape other than a circle, the back metal member 2 is fitted to the wood club head main body 1, and when the golf club is used. Therefore, the back metal member 2 does not rotate due to the impact. Projection 4
Can be elliptical, square, rectangular, rhombic, and the like. In FIG. 2, the shape is substantially rectangular. However, if such a linear shape is formed, if the fitting cannot be performed because the shape does not match the shape of the concave portion 5 of the back metal member 2, the periphery of the projection 4 can be relatively cut off. It can be easily fitted.

As shown in FIG. 2, the periphery of the projection 4 on the joint surface 31 of the wood club head main body 1 is formed as a groove 7 one step lower than the plane constituting the joint surface 31. Even if the angle formed between the side surface of the projection 4 and the joint surface 31 is designed to be 90 °, in an actual product, this portion often has a gentle round shape. Therefore, when the back metal member 2 is fitted to the protrusion 4 of the wood club head main body 1, the protrusion 4 does not completely fit in the recess 5 of the back metal member 2, and the joining surface 32 of the back metal member 2
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 periphery of the projection 4 of the joint surface 31 is formed as a groove one step lower than the plane constituting the joint surface 31, there is no radius at the angle formed by the side surface of the projection 4 and the joint surface 31, and the wood club head body 1 The bonding surface 31 of the back metal member 2 and the bonding surface 32 of the back metal member 2 fit exactly, so that it is not necessary to post-process the angle between the side surface of the projection 4 and the bonding surface 31 exactly to 90 °.

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

For example, holes may be formed in two places on the left and right (including the corresponding back metal member 2) on the protrusion 4, or holes may be formed in two places by removing the protrusion 4. .
Of course, two or more holes may be formed. By inserting the screw into the hole, the head of the screw after the back metal member 2 is fixed to the wood club head main body 1 is cut along the outer periphery of the back weight member 2 to improve the appearance.

With the above configuration, 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 greater than the specific gravity of the wood club head main body excluding the sole member, the position of the center of gravity is lowered, the sweet spot and the ball hitting point are closer, and the ball is easily lifted. Because it is possible, it is possible to further provide a preferable golf club to the player. In addition, as a sole member having a large specific gravity, a cobalt alloy, a copper alloy, a nickel alloy, stainless steel, a tungsten alloy, or the like can be used.

[0021]

The present invention is configured as described above.
The back metal member 2 can be easily and firmly fixed to the wood club head main body 1 irrespective of the connection between the metals. Therefore, there is no occurrence of a gap or gap between the back metal member 2 and the wood club head main body 1 without being able to withstand the impact at the time of collision between the ball and the head.

In particular, if the projection 4 of the joining surface 31 on the side of the wood club head main body 1 is formed in a shape other than a perfect circle, the displacement and the gap between the back metal member 2 and the wood club head main body 1 can be further ensured. Can be prevented. Further, if the periphery of the projection 4 of the joint surface 31 on the side of the wood club head main body 1 is formed as the groove 7 which is one step lower than the plane constituting the joint surface 31, the joint surface 32 of the back metal member 2 and the wood club head main body 1 And the joining surface 31 can be joined exactly.

Since the back metal member 2 is made of a material having a high specific gravity, such as a copper alloy, a nickel alloy, a cobalt alloy, stainless steel, and a tungsten alloy, the depth of the center of gravity is increased, and a metal golf club head having a wide sweet spot is provided. Becomes Furthermore, if the sole member is made of a cobalt alloy, copper alloy, nickel alloy, stainless steel, tungsten alloy material or the like having a specific gravity larger than the specific gravity of the wood club head body excluding the sole member, the center of gravity is lowered, and the sweet spot and the ball are reduced. , And the golf club can be provided to the player.

[Brief description of the drawings]

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

FIG. 2A is a front view of a joining 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]

 DESCRIPTION OF SYMBOLS 1 Wood club head main body 2 Back metal member 31 Joining surface 32 Joining surface 4 Projection 5 Depression 61 Hole 62 Hole 7 Groove

Claims (5)

[Claims] When a back metal member having a higher specific gravity than the wood club head body is attached to a back portion of a hollow metal wood club head, a projection is provided on a joint surface on the wood club head body side. A concave portion is provided on the joint surface of the back metal member to be fitted to the protrusion, and after the wood club head body and the back metal member are fitted, the recess extends from the back metal member to the wood club head body. A metal wood club head in which the back metal member is fixed to the wood club head body with screws. 2. The metal wood club head according to claim 1, wherein the projection on the joining surface on the wood club head main body side has a shape other than a perfect circle. 3. The metal wood according to claim 1, wherein a peripheral edge of the projection on the joining surface on the side of the wood club head body is a groove one step lower than a plane constituting the joining surface. Club head. 4. The metal member according to claim 1, wherein the sole member of the wood club head body is made of a material having a specific gravity larger than that of the wood club head body excluding the sole member. Wood club head. 5. The back weight member is made of a copper alloy, a nickel alloy, a cobalt alloy, stainless steel, a tungsten alloy, or the like, and the sole member is made of a cobalt alloy, a copper alloy, a nickel alloy, stainless steel, a tungsten alloy, or the like. 5. The metal wood club head according to any one of 4.