JPH0228941Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in an iron club set consisting of a plurality of iron clubs, and particularly to an improvement in the hosel portion of each club in the iron club set.

[Conventional technology]

Generally, an iron club set consists of a plurality of iron clubs ranging from long irons to short irons. The head of each iron club includes a hosel section into which the shaft is inserted and a ball striking section for hitting the ball, and the loft angle of the ball striking section gradually increases from long irons to short irons. ing. In the conventional iron club set, the British patent no.
As shown in the specification of No. 260226, the length and shape of the hosel portion are the same for each club, and the ball-hitting portion is also formed to have approximately the same contour shape. On the other hand, Japanese Patent Laid-Open No. 53-87829 discloses an iron club set in which the length of the hosel portion is gradually increased from long irons to short irons.

[The problem that the idea attempts to solve]

Incidentally, compared to middle irons and short irons, the long irons in the iron club set focus on hitting the ball farther, and therefore require a relatively low flight trajectory. As short irons become more important, more emphasis is placed on the accuracy of ball flight distance, and therefore higher trajectory flight is required as short irons become more important. That is, in the case of a flight with a high trajectory, the falling angle of the ball becomes large and the rolling distance of the ball after falling becomes short, making it easier to obtain a shot with an accurate flight distance.

One way to change the height of the ball's trajectory is to change the degree to which the club shaft flexes during the swing. That is, the clubshaft is bent toward the hand [the kick point (the point of dynamic deflection in the swing) is closer to the grip. ] Compared to iron clubs that exhibit this tendency, iron clubs that exhibit a tendency for the tip of the clubshaft to bend (the tight point is closer to the head) have a larger actual loft angle at impact, which increases the flight of the ball. The increased angle allows more backspin to be applied to the ball, giving the ball a higher trajectory. Therefore, in an iron club set, it is desirable that the shaft's kick point be gradually moved closer to the head as the club length becomes shorter.

Furthermore, in general, in an iron club set, the impact position of the ball on the ball hitting portion of the club head is influenced by the loft angle, and as the golfer changes from long irons to short irons, the ball hitting location moves closer to the sole of the ball hitting portion of the club head. In this case, if the sweet spot of the club is off from the ball's impact position, the head will rotate even if you hit the ball at the sweet spot, worsening the direction of the ball's flight, and
You will not be able to obtain sufficient flight distance. Therefore, it is desirable that the sweet spot of the club coincides with the hitting point of the ball, so as the hitting point of the club moves closer to the sole, the center of gravity of the head should also gradually move closer to the sole. desirable.

The length of the hosel in an iron club set affects the above-mentioned kick point position of the club and the position of the center of gravity of the head, but in a conventional iron club set, as mentioned above, the length of the hosel part affects each club. same or
Since the length of the club gradually increases as it becomes shorter, it has been difficult to satisfy the above-mentioned demands.

[Means for Solving the Problems] In view of the above points, the present invention consists of a plurality of iron clubs with shafts of different lengths, and each club has a shaft of a normal length, a ball-striking part, a hosel part, and a shaft of a normal length. The ball-striking portion of the head of each club has a loft angle that increases as the club length becomes shorter, and the ball-striking portion of each club has a shape that is In the iron club set, the vertical height of the ball hitting portion and the horizontal length from the connecting portion side to the side surface of the toe portion are equal to each other when viewed from the direction in which the ball is launched during normal address. To provide an iron club set characterized in that the length of a hosel part of a club is formed to be gradually shorter as the club length becomes shorter.

[Effect]

According to the present invention, the length of the hosel portion is shortened as the club length becomes shorter, so as the club length becomes shorter, the position of the club shaft's kick point (dynamic deflection point during swing) is sequentially adjusted. It can be set closer to the head. Therefore,
As you change from short iron to short iron, you will be able to obtain a higher ball trajectory, and as you change from long iron to short iron, you will be able to easily control the flight distance of the ball.

Additionally, in general, in an iron club set, as the club length becomes shorter due to the influence of the loft angle, the ball's impact position becomes closer to the sole, but as the club length becomes shorter, the length of the hosel part is shortened. Therefore, as the club length becomes shorter, the center of gravity of the club head can be changed closer to the sole, and the position of the sweet spot of the club head can therefore be made to correspond to changes in the ball hitting position. Therefore, it is possible to prevent the rotation of the head due to the misalignment between the sweet spot and the point of impact, and it is possible to improve the direction of flight of the ball with any club, and to improve the flight distance of the ball. You will be able to do this.

Additionally, in general, in an iron club set, the head speed increases as the club length increases, so as the club length increases, it is necessary to increase the connection strength between the head and the shaft. In an iron club set, the longer the club, the longer the hosel portion, so that this requirement for strength can be met.

In the present invention, the length of the hosel portion of the club may be formed to gradually become shorter as the club length becomes shorter so that the sweet spot of the club is positioned at the same ratio with respect to the toe and heel of the head of the club. preferable.

With this configuration, the sweet spot positions relative to the toe and heel of the club head are aligned at the same ratio, making it possible to easily catch the ball at the sweet spot position. Therefore, with any club in the club set, it is possible to further increase and stabilize the flight distance of the ball, and to stabilize the directionality of the ball.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the embodiments shown in FIGS. 1 to 6, from long irons to short irons,
Each club has a regular length shaft (not shown);
For example, a 2 iron is 39 inches and a 5 iron is 39 inches.
The shaft length is 37.5 inches, and the pitching wedge is 35 inches, and the length decreases proportionally from long irons to short irons.

The head 1 of each iron consists of a hosel part 2 to which a shaft is attached, a ball hitting part 3 to hit a ball, and a connecting part 4 between the two parts. The loft angle of the ball hitting portion 3 is gradually increased from long iron to middle iron to short iron (α ₁ >α ₂ >α ₃ ). Also, the ball hitting section 3
As shown in Figures 2, 4, and 6, the shape is from the boundary between the vertical height of the ball hitting part 3 and the connecting part 4 to the side surface of the toe part when viewed from the direction in which the ball is launched during normal address. The horizontal length of each club is the same (hereinafter referred to as the same contour shape). The structure and shape of such a head is no different from that of a conventional iron club set. However, in the present embodiment, unlike the conventional method, the length of the hosel portion 2 is formed to be gradually shorter from long irons to middle irons and short irons so that l ₁ > l ₂ > l ₃ . ing.

That is, in the long irons shown in FIGS. 1 and 2, since the loft angle of the head ball-striking section 3 is small, the size of the connecting section 4 that connects the ball-striking section 3 and the hosel section 2 is inevitably small. Therefore, the heel 6 side of the head 1 becomes lighter than the toe 5 side.
Therefore, the length l ₁ of the hosel part 2 is made longer than the hosel part 2 of other iron heads, so that the sweet spot P can be adjusted to the toe of the face surface 7.
It is positioned approximately in the center between the heels.

Further, in the middle irons shown in FIGS. 3 and 4, the loft angle is larger than that of the long irons, and therefore the size of the connecting portion 4 is larger than that of the long irons, so that the weight distribution of the head 1 is The side and the heel 6 side are approximately the same. Therefore, the length _l2 of the hosel portion 2 is formed to be approximately the middle length between long irons and short irons, and as a result, the sweet spot P of the iron head is located between the toe and heel of the face surface 7 as in the long irons. It is located approximately in the center of the

Furthermore, in short irons with a large loft angle (Figs. 5 and 6), the connecting portion 4 is the largest, so the weight distribution of the head 1 is
The distribution is heavier on the side than on the toe 5 side. Therefore, the length _l3 of the hosel portion 2 is formed shorter than that of the long irons and middle irons, and as a result, the sweet spot P is located approximately at the center between the toe and heel of the face 7, similar to the long irons and middle irons. It is becoming located. However, the position of the sweet spot P does not necessarily need to be located in the center between the toe and heel of the face 7 as in the above embodiment, and the position of the sweet spot P is determined by the distance from the sweet spot P to the toe 5 and the sweet spot of each club of each number. As long as the ratio of the distance from P to the heel 6 is constant, the position may have a ratio of 6 to 4, for example.

In the iron club set having the above configuration, the length of the hosel portion 2 of each club having the same contour shape is sequentially shortened as the club length becomes shorter. The clubshaft's tight point gradually moves closer to the head. The term "tight point" here refers to the dynamic deflection point of the club shaft during a swing, and is the point where the curvature of deflection changes the most during the swing. In other words, the shaft of a golf club has a head, which is a heavy body, at the tip of the shaft, so during the downswing, the head deflects backward in the direction of travel, creating a tight point, and this deflection is restored just before impact, accelerating the ball at the time of impact. give. This tight point occurs at the point where the clubshaft is most flexible, but clubshafts are generally flexible, and the diameter decreases toward the tip, and this narrowest diameter portion is located at the hosel section, which has greater rigidity. connected. Therefore, a difficult point during swing occurs near the connection between the shaft and the hosel. The state of the head at impact with an iron club is greater than the actual loft of the face because the head is in front and the head is directed upwards. At this time, if the part of the shaft near the head is more flexible, the loft will be larger and the ball will have a higher trajectory.

By the way, in this example, as mentioned above,
As the length of the club becomes shorter, the length of the hosel portion 2 becomes shorter, so the tighter the short iron, the closer the tight point is to the head. It is larger than the loft of the face, making it easier to obtain a high trajectory, and therefore,
The shorter the iron, the more accurate the distance it will fly, and the more it meets actual requirements.

Furthermore, if the length of the hosel portion 2 is short, the weight of that portion will be small, so the center of gravity of the head will be lowered. Therefore, in the iron club set configured as described above, as the club length becomes shorter, the center of gravity of the club head can be moved closer to the sole, and therefore, as the club length becomes shorter, the center of gravity of the club head becomes closer to the sole. The sweet spot can be gradually moved closer to the sole. This coincides with the fact that as the club length becomes shorter, the ball hitting position of the head becomes closer to the sole, making it easier to hit the ball at the sweet spot with any club.

In addition, in general, the longer the club length, the greater the head speed, so as the club length increases, the connection between the club shaft and the head needs to be reinforced more firmly. Since the length of the hosel portion 2 increases as the club length increases, this requirement for strength can be met.

Furthermore, in the iron club set configured as described above, the sweet spot positions of the club head are aligned at the same ratio with respect to the toe and heel, making it possible to easily catch the ball at the sweet spot position. Therefore,
It is possible to increase and stabilize the flight distance of the ball with any club in the club set, and also to stabilize the direction of flight of the ball.

[Effect of idea]

As is clear from the above description, in the iron club set according to the present invention, each club has a head ball-striking part with approximately the same contour shape, and as the club length becomes shorter, the length of the hosel part of the club is sequentially shortened. As the club length becomes shorter, the shaft's kick point position can be moved closer to the head of the shaft as the club length becomes shorter.
The center of gravity of the head can be moved closer to the sole. Therefore, as you change from short iron to short iron, you will be able to obtain a higher ball trajectory, and as you change from long iron to short iron, you will be able to easily control the flight distance of the ball. With any club, it becomes easier to hit the ball at the sweet spot, which increases the flight distance of the ball and improves its direction.

Generally, the longer the club length, the greater the head speed, so as the club length increases, the connection between the club shaft and the head needs to be made stronger. Since the length of the hosel portion becomes longer as the length increases, such strength requirements can be met.

[Brief explanation of drawings]

Fig. 1 is a side view of the head of a long iron according to an embodiment of the present invention, Fig. 2 is a front view of the head shown in Fig. 1, and Fig. 3 is a side view of the head of a middle iron according to an embodiment of the present invention. 4 is a front view of the head shown in FIG. 3, FIG. 5 is a side view of a short iron head in an embodiment of the present invention, and FIG. 6 is a front view of the head shown in FIG. . 1... Head, 2... Hosel part, 3... Ball hitting part, 4... Connecting part.

Claims (1)

[Claims for Utility Model Registration] 1. Consisting of a plurality of iron clubs with different shaft lengths, each club having a shaft of normal length, a head consisting of a ball-striking part, a hosel part, and a connecting part between the two. The loft angle of the ball hitting portion of the head of each club increases as the club length becomes shorter, and the shape of the ball hitting portion of each club is different from the direction in which the ball is launched at normal address. In an iron club set in which the vertical height of the ball-striking part and the horizontal length from the connecting part side to the toe part side surface are equal to each other, the length of the hosel part 2 of each club is l ₁ , l ₂ , and l ₃ are formed to become shorter in sequence as the club length becomes shorter. 2. The iron club set according to claim 1, wherein the sweet spot of the head of the club is located at the same proportion to the toe and heel of the club.