JPH10295861A - Iron club for golf and iron club set formed by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron club which ensures a good head turn or an iron club which substantially prevents hooking and an iron club set for which these iron clubs are used by setting the centroid position of a head body nearer the toe side or heel side than the center in its bottom. SOLUTION: The head body 1 of the iron club is formed of a light metal like titanium or titanium alloy. Three pieces to six pieces of bar-shaped weight materials 6 consisting of the tungsten, tungsten alloy, etc., having the sp. gr. larger than the sp. gr. of the light metal are arrayed apart prescribed intervals from the toe side to the heel side in the section below the rear cavity part 2 of the head body and above the ground contact surface. There weight materials are embedded at prescribed depths from the rear surface of the head body toward the club face side in such a manner that the axial canters thereof are nearly paralleled with the ground contact surface. The total weight ratio of the weight materials 6 to the head body is confined to <=40%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an iron club for golf and an iron club set using the same. More specifically, the present invention relates to a golf club having a head body made of a light metal such as titanium or a titanium alloy. The present invention relates to a golf iron club in which a weight material having a specific gravity higher than that of the light metal is buried below a back cavity portion of a head body, and to an improvement of an iron club set using the same.

[0002]

2. Description of the Related Art Conventionally, a head body is formed of a titanium alloy, pure titanium or aluminum, and a weight material having a specific gravity higher than that of the head body, for example, beryllium copper alloy, copper alloy, stainless steel, is provided below a rear cavity of the head body. A golf iron club having a block piece such as embedded therein is known.

[0003] In this club, the center of gravity of the entire head is shifted to the lower rear side to facilitate swinging of the club and to achieve the effect of a low center of gravity iron such that the trajectory can be increased and the flight distance of the golf ball can be extended. Things.

[0004]

However, in the above iron club, the weight material is embedded as a single block piece over a wide range from the heel side to the toe side in the lower portion of the rear cavity of the head body. The center of gravity of the weight material is at the center, and the center of gravity of the iron head is at the center of the lower part of the head body.

[0005] Unlike golfers and fairway woods, golf iron clubs are said to be preferable because swinging the club head into the ground allows the ball to rise higher and hit the ball with a good backspin. When the head is driven, the sole of the head is generally touched from the center or slightly heel side of the center and swings out, and after this touch, the club head rotates the heel side shaft. The so-called head will return as the center and be swung away.

[0006] There are about ten types of iron clubs, from long irons to short irons. It has been pointed out that long irons are particularly difficult and cannot swing well with amateurs. It is pointed out that a so-called golf ball is apt to be caught.

[0007] Conventional iron golf clubs have been developed mainly with a low center of gravity. However, in fact, iron clubs have not been developed in consideration of the return of the head in addition to the low center of gravity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object the purpose of setting the center of gravity of the head main body below the head main body as in the prior art, while changing the weight material embedded in the head main body to the heel side. And a golf iron club that can change the degree of return of the head by changing the position of the center of gravity of the lower part of the head between the long iron and the short iron toward the heel or the toe by dividing the head into a toe side, and an iron using the same. To provide a club set.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, in a golf iron club according to the present invention, a head body of the iron club is formed from a light metal such as titanium or a titanium alloy, and a back cavity of the head body is formed. Three or more rod-shaped weight members having a specific gravity larger than that of the light metal are arranged at predetermined intervals from the toe side to the heel side below the ground contact surface and above the ground surface, and the axis of the weight material is aligned with the ground surface. The head material is buried at a predetermined depth from the back surface of the head body to the face surface side so as to be substantially parallel to the head body, and the total weight ratio of the weight material to the head body is 40%.
It becomes as follows.

By adjusting the weight of the weight member on the toe side or the heel side so that one is larger than the other, the center of gravity of the head body is set to the toe side or the heel side from the center of the bottom. Is easy.

In the golf iron club described above, when four to six rod-shaped weight members are arranged at a predetermined interval, the center of gravity of the head body can be further reduced. Also, the position of the center of gravity of the head main body can be finely adjusted widely from the toe side to the heel side.

In the golf iron club described above, when the rod-shaped weight member is made of a round rod-shaped tungsten or a tungsten alloy, it is easy to bury the rod-shaped weight material in the head main body, and it is possible to reduce the cost relatively. it can.

In a golf iron club set including a long iron to a short iron according to the present invention, the head body of each iron club is formed of a light metal such as titanium or a titanium alloy, and the head body is formed under the rear cavity of the head body. A plurality of weight members having a specific gravity greater than that of the light metal are arranged at a predetermined interval from the toe side to the heel side above the contact surface, and the weight members are directed from the back surface of the head main body to the face surface side. To a predetermined depth, the weight balance of the plurality of weight members is set closer to the toe side than the lower center of the head body in the case of a long iron, and the weight balance of the plurality of weight members is set in the case of a short iron. It is set on the heel side of the lower center of the head body.

With this arrangement, when a golf ball is hit with a long iron, the tip of the head, ie, the toe side, around the heel side rotates faster, the head returns better, the moment of inertia with respect to the ball increases, and the flight distance of the ball increases. Can be extended, and the iron club can be easily swung out of the club head. On the other hand, since the head is hard to return with the short iron, a so-called short iron which does not easily cause a hook can be obtained.

In the iron set, each of the weight members may be a rod-shaped weight member, and the length of the weight member embedded in the head body may be changed.
The position of the center of gravity from the long iron to the short iron can be changed very easily.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 (a) and 1 (b) show a front view of a head body of an iron club according to the present invention, respectively. FIG. 2 is a sectional view taken along line II-II in FIG.

The head body 1 is made of titanium or a titanium alloy, and a cavity 2 is formed on the back surface of the head body 1 in a shape substantially similar to the shape of the back surface and the lower portion is deeper than the upper portion. The inner surface 2a of the cavity portion 2 is substantially parallel to the face surface 3 and a uniform thick portion is formed therebetween.

The inner lower surface 2b of the cavity 2 and the sole surface 4
As shown in FIG. 1 (b), there are a total of five round cylindrical recesses 5 (5a to 5e) from the heel side to the toe side as shown in FIG.
Are formed at substantially equal intervals, and the central concave portion 5c is located at the lower center of the head main body 1. Each of the recesses has a round bar-shaped tungsten 6 (6a) as a weight material.
To 6e) are buried. As shown in FIG. 2, each recess 5 is formed so that its axis is substantially parallel to the grounding surface when the head body is used, and the diameter of the cylindrical recess is 6 to 10 mm. 8 to 2 axial depth
The diameter of the tungsten 6 is set to 0 mm, and the tungsten 6 buried in the recess 5 has a diameter that can be tightly fitted into the recess 5 so that the tungsten 6 does not fall off when the iron club is used. The length of embedding the round bar-shaped tungsten 6 into the recess 5 can be changed within the range of the depth of the recess, and by changing the embedding length of tungsten 6 on the toe side and the heel side, The position of the center of gravity of the main body can be changed to the toe side or the heel side from the center of the lower part of the head main body. The gap between the tip of the buried tungsten and the inner surface of the recess is preferably filled with an adhesive for preventing the tungsten from falling off.

The specific gravity of the round bar-shaped tungsten is 17 g.
/ Cm ³ , the total weight of the round bar-shaped tungsten buried in the recesses 5a to 5e of the head main body varies depending on the iron club number, and an example of the total weight of tungsten with respect to the total weight of the head main body is shown in Table 1 below. As shown in FIG.

[0020]

[Table 1]

In the iron set for a golf club of the present invention, the long irons (# 2 to # 3) and the short irons (# 8 to PW, AW) use tungsten 6a to 6e.
The position of the center of gravity of the weight member is changed to the toe side or the heel side. That is, in the long iron, the tungsten 6 on the toe side of the five round rod-shaped tungsten 6a to 6e is used.
The weight of a and 6b is 25% to 100% greater than the weight of tungsten 6d and 6e on the heel side, while the weight of tungsten 6d and 6e on the heel side of the six round rod-shaped tungsten 6a to 6e is increased in the short iron. It is 20% to 80% heavier than tungsten 6a and 6b on the toe side.

As described above, by making the weight ratio of tungsten on the toe side of the long iron larger than that on the heel side, the rotation of the club body around the shaft of the head body after the ball is hit by the club head, ie, the rotation of the head, It is possible to provide a long iron club that returns quickly and is easy to swing. On the other hand, in the case of a short iron, by making the weight ratio of tungsten on the heel side smaller than that of the toe side, the head returns poorly as opposed to the case of the long iron, so the head is left as it is immediately after hitting the ball with the club head By maintaining the posture, it is possible to easily perform a control shot and to prevent the occurrence of a so-called hooked ball caused by the head returning too fast.

In the case of the iron club head shown in Table 1, the lower limit of the weight ratio of tungsten is 19.2%, but this ratio can be reduced to 15%. If the ratio is less than 15%, the position of the center of gravity of the entire head main body cannot be sufficiently lowered.
The upper limit of the weight ratio of tungsten is 31.5%, but this ratio can be increased to 40%.
Here, increasing the weight ratio of the weight member means that the weight of the entire head body of the iron club is substantially determined by the iron count, so the weight ratio of titanium constituting the head body is reduced and the shape of the head body is reduced. Means The upper limit of the weight ratio of the weight member is set to 40%. When the weight ratio exceeds this ratio, the size of the head main body is no different from that of the conventional iron head formed of stainless steel having a relatively large specific gravity. This is because the characteristics of the iron head made of metal cannot be utilized.

In the above embodiment, an example is shown in which a total of five round bar-shaped tungsten materials are arranged from the heel side to the toe side as the weight material made of tungsten. However, the present invention is not limited to this embodiment. Instead, the round bar-shaped tungsten may be one in the center of the bottom of the head body and one each on the heel side and the toe side across the head, or a total of three pieces, or the heel side and the toe side across the center of the bottom of the head body. 2 each
A total of four or six pieces, one by one or three, may be used.

In the above embodiment of the present invention, the weight material made of tungsten has a round bar shape, but the shape is not limited to a round bar shape, but may be an appropriate shape such as a square bar shape. it can. Further, not limited to tungsten, a tungsten alloy or other substance having a large specific gravity can be used.

[0026]

As described above, in the golf iron club of the present invention, three or more rod-shaped weight members are arranged at predetermined intervals from the toe side to the heel side, and the axis of the weight members is in contact with each other. Since the head is buried at a predetermined depth from the back of the head body to the face side so as to be almost parallel to the ground, it can be used not only as an iron club with a low center of gravity, but also as a weight material for the toe side or heel side. By adjusting the weight so that one is larger than the other, the center of gravity of the head main body is set to the toe side or the heel side from the center of the bottom, and the iron club with good head return or the iron club that is hard to be caught Can be provided.

In the above-described golf iron club, when four to six rod-shaped weight members are arranged at a predetermined interval, the center of gravity of the head body can be further reduced. Also, the position of the center of gravity of the head main body can be finely adjusted widely from the toe side to the heel side.

In the above golf iron club, when the rod-shaped weight material is made of round rod-shaped tungsten or a tungsten alloy, it is easy to bury the rod-shaped weight material in the head main body, so that the cost can be reduced relatively. it can.

Also, the configuration of the iron club is applied to a golf iron club set including a long iron to a short iron, and in a long iron, the weight balance of a plurality of the weight members is more than the lower center of the head body. By setting the weight balance of the plurality of weight materials to the heel side from the lower center of the head body in the short iron for the short iron, the head is set to center on the heel side when the golf ball is hit in the long iron. The rotation of the tip side, i.e., the toe side, becomes faster, the head returns better, the moment of inertia with respect to the ball increases, the flight distance of the ball can be extended, and the iron club can be easily swung out. On the other hand, since the head is hard to return with the short iron, a so-called short iron which does not easily cause a hook can be obtained.

In the above-mentioned iron set, each of the weight members is a bar-shaped weight member, and the length of embedding the weight member in the head body is changed so that the center of gravity position from the long iron to the short iron can be determined. Changes can be made very easily.

[Brief description of the drawings]

1A and 1B show a head portion of an iron club according to a first embodiment of the present invention, wherein FIG. 1A is a front view and FIG. 1B is a rear view.

FIG. 2 is a view II- of a head portion of the iron club of FIG. 1 (b);
FIG. 2 is a sectional view taken along line II.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head main body 2 Cavity part 3 Face surface 4 Sole surface 5 (5a-5e) Depression 6 (6a-6e) Round rod-shaped tungsten

Claims (5)

[Claims] An iron club head body is formed of a light metal such as titanium or a titanium alloy, and at least three or more specific gravities larger than the light metal are provided below a back cavity portion of the head body and above a ground contact surface. A rod-shaped weight material is arranged at a predetermined interval from the toe side to the heel side, and a predetermined weight is set from the rear surface of the head body toward the face surface side so that the axis of the weight material is substantially parallel to the ground contact surface. An iron club for golf, wherein the golf club is buried at a depth and the total weight ratio of the weight member to the head body is 40% or less. 2. The golf iron club according to claim 1, wherein four to six rod-shaped weight members are arranged at a predetermined interval. 3. The golf club according to claim 1, wherein the rod-shaped weight member is made of a round rod-shaped tungsten or a tungsten alloy. 4. In a golf iron club set including a long iron to a short iron, a head body of each iron club is formed of a light metal such as titanium or a titanium alloy, and a ground contact surface is formed below a back cavity portion of the head body. A plurality of weight members having a specific gravity greater than that of the light metal are arranged at a predetermined interval from the toe side to the heel side above the light metal, and the weight members are arranged from the back surface of the head body toward the face surface side. The weight balance of the plurality of weight members is set to be closer to the toe side than the lower center of the head body in the case of a long iron, and the weight balance of the plurality of weight members is set to the head in the case of a short iron. A golf eye characterized by being set on the heel side of the lower center of the main body. Club set. 5. The weight balance is changed to a toe side or a heel side by changing each of the weight members into a rod-shaped weight member and changing a length of embedding the weight members in the head body. The golf iron club set according to claim 4, wherein