JPH0838657A - Golf club head - Google Patents

Abstract

(57) [Summary] [Purpose] To expand the sweet spot and to improve the concentration by visual recognition when addressing. [Structure] A balance weight 10 having a smaller specific gravity than the material of the head body 1 is provided at the rear of the head body 1. Back side 1A of head body 1 and back side 10A of the balance weight 10
Are formed in the same plane. [Effect] The sweet spot can be increased by increasing the depth L of the center of gravity. There is no obtrusive part on the back of the head, and concentration can be enhanced when addressing.

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 such as an iron golf club, a putter golf club or a pitching golf club.

[0002]

2. Description of the Related Art Conventionally, a golf club head of this type (hereinafter referred to as a head) is integrally formed of stainless steel or the like as shown in FIGS. 1 and 6 of JP-A-6-1020, and its rear surface ( On the back side), a recess called a cavity was formed to control the center of gravity of the head.

[0003]

In the above prior art, in order to increase the depth of the center of gravity, which is the distance between the center of gravity of the face and the center of gravity of the head in relation to the size of the sweet area, the above-mentioned problem is solved under a limited weight condition. It is necessary to increase the protruding length of the sole, but there is a limit to the protruding length of the sole,
As a result, there was a limit to the expansion of sweet areas on the face. Further, when the golfer approaches the golf ball with a head before addressing the ball before addressing, it is necessary to carefully visually check and adjust the positional relationship between the face and the golf ball. Since the protrusion of the sole is formed on the bottom, there is a problem that it becomes an eyesore and lacks concentration.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to expand the sweet area, and to provide a golf club head which does not lack concentration when addressing.

[0005]

According to the present invention, in a golf club head having a face on the front surface of a head body and a hosel for connecting a shaft on one side, a recess is formed on the back surface of the head body. At the same time, a balance weight made of a material having a smaller specific gravity than the head body is provided in the recess, and the back surface of the head body and the back surface of the balance weight are provided in the same plane. Is.

The present invention also provides a golf club head according to claim 1, wherein a groove having a substantially semicircular cross section is formed at the boundary between the back surface of the head body and the back surface of the balance weight. is there.

[0007]

According to the structure of the first aspect, the center of gravity can be disposed at the rear portion of the head, the depth of the center of gravity can be increased, and there is no obstructive portion on the back side of the head, so that the concentration can be increased when addressing. .

Further, according to the structure of claim 2,
The delicate balance of the head can be adjusted by the depth and width of the groove.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The head body 1 is made of, for example, stainless steel, copper, beryllium copper alloy, lead, etc., a face 2 having a predetermined inclination is formed on the front surface, and a hosel 4 for connecting a shaft 3 is formed on one side. A recess 5 is formed on the back surface 1A of the head body 1. The depth A of the lower portion of the recess 5 is formed larger than the depth B of the upper portion thereof (A> B), and the height C of the inner portion is also increased.
The height D on the outer side is large (C <D).
Further, a projection 7 is integrally provided on the bottom 6 of the recess 5, and the projection 7 is formed in a reverse trapezoidal shape with a wide back surface 1A and a narrow bottom 6 side.

A balance weight provided in the recess 5
10 is made of a material having a smaller specific gravity than the head body 1, for example, titanium, aluminum or alloys thereof,
A recess 11 which is slightly larger than the recess 5 and is slightly smaller than the protrusion 7 is formed in advance.

Then, the balance weight 10 is fixed by press-fitting it into the recess 5 using a pressing device or the like. At the time of press-fitting and fixing, the back surface 1A of the head body 1 and the back surface 10A of the balance weight 10 are formed in a flat shape as shown by a chain line. As the combination of the materials, it is preferable that the difference between the material specific gravity of the head body 1 and the material specific gravity of the balance weight 10 is large.
It is preferable that the head body 1 is made of beryllium copper alloy and the balance weight 10 is made of titanium alloy.

In the embodiment, the boundary portion between the back surfaces 1A and 10A may become unclear at the time of the press-fitting and fixing as indicated by the dashed line in the vertical direction shown in the enlarged view of FIG. In addition, the groove 12 is formed by end mill processing or the like in order to maintain aesthetics. The groove 12 is formed in an arc shape having a width E and a depth F in cross section, and the groove 12 is colored blue, red or the like not shown.

In the head constructed as described above, the balance weight 10 having a smaller specific gravity than the material of the head body 1 is provided at the rear portion of the head body 1,
The center of gravity G can be disposed at the rear of the head, and the depth of center of gravity L can be increased to increase the sweet spot. Further, since the depth A of the lower portion is larger than the depth B of the upper portion and the height C of the inner side is larger than the height D of the outer side, the recess 5 has a dovetail shape, and the balance weight 10 is provided. Further, the balance weight 10 can be fixedly attached, and the center of gravity (not shown) of the balance weight 10 itself is located at the lower rear, so that the depth L of the center of gravity can be further increased.

Further, since the back surface 1A of the head main body 1 and the back surface 10A of the balance weight 10 are formed in the same plane, there is no obstructive portion at the rear part of the head, and the concentration is enhanced when addressing. You can

A groove 12 is formed at the boundary between the back surface 1A and the back surface 10A, and the width E and depth F of the groove 12 are adjusted to finely adjust the center of gravity G to a position suitable for a golf player. You can Furthermore, since the groove 12 has an arc-shaped cross section, sand and soil are less likely to be clogged and can be kept hygienic. Moreover, the groove 12 is end-milled, so that the groove 12 can be accurately and easily processed.

Further, when the head body 1 is made of beryllium copper alloy and the balance weight 10 is made of titanium alloy, the difference between the material specific gravity of the head body 1 and the material specific gravity of the balance weight 10 becomes large, and a good center of gravity G is obtained. The position can be adjusted.

FIG. 4 shows a second embodiment of the present invention,
The same parts as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, the back surface 1 of the head body 1 is formed without forming the groove 12 in the first embodiment.
A and the back surface 10A of the balance weight 10 are formed in the same plane.

Therefore, the center of gravity G can be arranged in the rear part of the head, the center of gravity depth L can be increased to increase the sweet spot, and the recess 5 and the balance weight 10 can be securely fixed in the form of a dovetail groove. In addition, since the center of gravity of the balance weight 10 itself is located at the lower rear, the center of gravity depth L can be further increased.

Further, since the back surface 1A of the head main body 1 and the back surface 10A of the balance weight 10 are formed in the same plane, there is no obstructive portion at the rear portion of the head, and the concentration is enhanced when addressing. You can

The present invention is not limited to the above embodiment, and various modifications can be made, for example, various combinations of materials of the head body 1 and the balance weight 10 can be applied.

[0021]

According to the invention of claim 1, in a golf club head having a face on the front surface of the head body and a hosel for connecting a shaft on one side, a recess is formed on the back surface of the head body. In addition, a balance weight made of a material having a smaller specific gravity than that of the head main body is provided in the recess, and the back surface of the head main body and the back surface of the balance weight are provided in the same plane, thereby expanding the sweet spot. It is possible to provide a golf club head capable of improving the concentration of visual recognition while addressing.

According to a second aspect of the present invention, there is provided a golf club head capable of finely adjusting the center of gravity of the head by forming a groove at the boundary between the back surface of the head body and the back surface of the balance weight. Can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a first embodiment of the present invention.

FIG. 3 is a rear view showing the first embodiment of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

[Explanation of symbols]

 1 head body 1A back surface 2 face 3 shaft 4 hosel 5 recessed portion 10 balance weight 10A back surface 12 groove

Claims (2)

[Claims] 1. A golf club head having a face on the front surface of the head body and a hosel for connecting a shaft on one side, wherein a recess is formed on the back surface of the head body, and the head is formed in the recess. A golf club head, wherein a balance weight made of a material having a smaller specific gravity than that of the main body is provided, and the back surface of the head main body and the back surface of the balance weight are provided in the same plane. 2. The golf club head according to claim 1, wherein a groove is formed at a boundary between a back surface of the head body and a back surface of the balance weight.