JP2840556B2 - Golf club set - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron-based golf club set in which the loft angle is increased in a predetermined order as the iron number increases.

[0002]

2. Description of the Related Art A conventional iron-based golf club set has nine pitches (PW) and a sand wedge (SW) added to the third to ninth, or a pitching sand (PW) between a PW and a SW. PS) or an approach wedge plus 10 sets is common. In such a set, the loft angle is increased in a predetermined order as the count increases. Typical loft angle setting examples are No. 1 ... 18 °, No. 2 ... 2
0 °, 3rd… 22 °, 4th… 25 °, 5th… 28 °, 6
No. 32 °, No. 7 36 °, No. 8 40 °, No. 9 44
°, PW: 48 °, PS: 53 °, SW: 57 °. The loft angles of these counts differ by about ± 3 ° depending on the set example. It is the point where the resultant force of the weight acting on the head gathers, and as a position to measure the balance, that is, considering the center of gravity as a whole set, one that is designed to be the center of the face with all counts, and all counts Known are those designed to have a low center of gravity. Such an attempt to lower the center of gravity of all counts is mainly intended to realize a high trajectory flight that is easy to raise the ball.

[0003]

The conventional set is effective for a flow system relating to the position of the center of gravity in the vertical direction.
Such things are not, in the other hand set which aimed at the total count low center of gravity, it is difficult to increase the spin amount of the ball with a short iron, stop the ball on the green had become worse. In a general PW, the head weight was about 294 g and the height of the center of gravity was 18.1 mm. When the ball of the thread wound balata cover was hit at a head speed of 40 m / s with this PW, the speed was 9060 rpm. In the case of a PW with a low center of gravity, an increase in the flight distance can be expected, but the spin amount further decreases,
The ball was difficult to stop on the green.

Accordingly, an object of the present invention is to provide a golf club set that makes it easy for a long iron to raise a ball, and a short iron that increases the spin rate and makes it easier for the ball to stop on a green.

[0005]

[SUMMARY OF] To achieve the above object, the present invention is a golf club set of irons system loft angle is increased in a predetermined order according to count increases, the upper portion of the head back of the cavity The toe
Weighted fillet over the heel or
Overlay the ribs around the cavity in addition to the
By setting the center of gravity height HG to 19 ± 3 mm with a club having a loft angle of 27 ° ± 3 °, the weighted portion is adjusted so that the center of gravity HG becomes higher as the club number increases.
The thickness of the ribs is increased or the weight of the ribs is increased or the thickness of the ribs is increased . In a preferred embodiment, the height of the center of gravity HG is set to 21 ± 3 mm or more, more preferably 21 ± 1 mm or more, for a club having a loft angle of 40 ° or more.

[0006]

According to the present invention, a weighted portion in the cavity is provided.
Or weight distribution based on the buildup of ribs around the cavity
As a result, the center of gravity in the vertical direction is adopted, so the longer the iron, the lower the center of gravity, making it easier to raise the ball.The shorter the iron, the higher the center of gravity, increasing the spin rate of the ball, and Makes the ball stop easily. Ball speed of 40% /
The spin rate when hit at s was 9,700 rpm. An increase in the spin amount of 640 rpm was observed as compared with the above-mentioned general PW spin amount.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an iron golf club head 1 to be set. The head 1 includes a hosel 2 connected to a lower end of a shaft 10, and the lower end of the hosel 2 has a face surface. 3, a sole portion extending from the heel to the toe in a plane substantially parallel to the ground when the golf club is addressed, a depression 5 provided at the center of the back surface of the head 1, ie, a cavity, provided around the depression 5. A rib 6 is provided. In a set of a plurality of golf clubs having a so-called cavity-back type iron head 1 shown in FIGS. 1 and 2, the head 1 is caused to flow such that the center of gravity of the head 1 increases as the iron count increases. At this time, the loft angle 27
The center of gravity is 19 ± 3 mm, preferably 19 ± 1 mm, for a club having a count of ± 3 ° (especially for a 5-iron). As an example of such a flow, a weighted portion 8 is provided in the recess 5 near the rib 6 on the side of the top edge 7. The thickness of the weighted portion 8 is increased as the count increases. In a long iron, such a weighted portion 8 is not necessary. In addition, the position of the center of gravity can be changed from the position closer to the toe to the position closer to the heel by adjusting the thickness of the rib 6 closer to the toe. As another example of the means for flowing the height of the center of gravity, not only the adjustment of the thickness of the portion shown in FIG. 2 but also the adjustment of the thickness of the portion of the top edge 7, that is, the thickness of the portion in FIG. The height of the center of gravity can be caused to flow by adjusting the weight, or by adjusting the thickness of the sole portion 4, that is, the thickness of the portion shown in FIG. 2, or by adjusting the thickness of the portion at the portion shown in FIG. It goes without saying that the flow can be performed in combination with the adjustment of the amount of flesh.
Alternatively, in a head in which different materials called a composite club are combined, the height of the center of gravity can be caused to flow by materials having different specific gravities.

Here, as shown in FIG. 3, the height of the center of gravity is obtained by drawing a line (Z axis) perpendicular to the face surface 3 from the position of the center of gravity G of the head 1, and the face surface 3 and this line (Z axis) are drawn. The height HG between the crossing position and the sole portion 4 is referred to. When a line (Z axis) perpendicular to the face surface 3 is drawn from the center of gravity G, the distance from the center of gravity G to the face surface 3 is defined as the center of gravity depth Z.
G. Further, the height between the position of the center of gravity G and the sole portion 4 is referred to as HGR, and the distance between a line passing through the leading edge 9 and parallel to the Z axis and the Z axis is referred to as a center of gravity distance YG. Although not shown, a line passing through the center of gravity G and parallel to the face surface 3 and passing through the paper surface of FIG.
A straight line parallel to the face surface 3 and perpendicular to the X axis through Y
Assuming that a straight line perpendicular to the X axis and the Y axis and passing through the center of gravity G is the Z axis, the moment of inertia around the X axis is IX,
The moment of inertia around the Y axis is IY, and the moment of inertia around the Z axis is IZ. When each of these values is a conventional general PW, the head weight is 294.3 g and YG is 23.2 m.
m, ZG 0.3mm, HG 18.1mm, HGR 17.8m
m, IX 10.2 g · mm · sec ² , IY 27.4 g · mm · s
ec ² and IZ 30.0 g · mm · sec ² . The PW in the set example of the present invention has a head weight of 294.1 g, Y
G29.8mm, ZG0.7mm, HG21.1mm, HGR
20.6 mm, IX 13.2 g · mm · sec ² , IY 27.8
g · mm · sec ^2, was IZ32.5g · mm · sec ^2. Both of these two PWs were cast from stainless steel and subjected to normal nickel plating. As a result of a test hit of a ball of the thread-wound balata cover (our J's balata) with these two PWs (head speed 40 m / s), it was 9 in the conventional general PW.
The backspin was 060 rpm, whereas the PW of the set of the present invention was 9700 rpm. When the height of the center of gravity is 3 mm higher than that of the conventional PW, it is considered that the distance between the hit point and the position of the center of gravity increases, and the difference in the distance affects spin. FIG. 4 is a diagram for explaining the gear effect between the ball and the face surface 3 at the time of impact. When the ball is hit, the ball is rotated in the direction of the arrow, that is, the backspin is applied, and the head 1 is moved to the top edge 7 side. Try to rotate in the direction of the arrow.

[0010] In the graph shown in FIG. 5, □ indicates an example of the embodiment set of the present invention, and indicates the height HG of the center of gravity of each count. In addition, those marked with a triangle indicate the height HG of the center of gravity of each count in the conventional set example. In the embodiment of the present invention, the height of the center of gravity HG is set to 19 ± 1 mm for a club having a loft angle of 27 ° ± 3 °, for example, a 5-iron club, and the height of the center of gravity HG is set to increase as the iron number increases. It is. In the PW, the height HG of the center of gravity was 21.1 ± 1 mm as described above, and was 20.09 mm for the ninth iron. Generally, the height of the center of gravity HG
Is preferably set to increase by about 0.25 ± 0.1 mm for each count, but may be slightly changed depending on the set.

[0011]

As described above, according to the present invention , the toe is heated from the toe to the upper part in the cavity on the back surface of the head.
A weighted part over the
Overlay ribs around the cavity in addition to the attachment
By increasing the weighted fillet so that the height of the center of gravity increases as the count increases,
Since the buildup of the ribs is adjusted , the ball easily rises with a long iron, and the spin amount increases with a short iron, and the ball easily stops on the green. Especially 5
In a short iron shorter than a number iron, a larger backspin amount can be given than in a conventional club, and the ball can easily stop on the green.

[Brief description of the drawings]

FIG. 1 is a perspective view of an iron golf club head used in a set of the present invention as viewed from the back side.

FIG. 2 is an end view taken along the line AA of FIG. 1;

FIG. 3 is a diagram illustrating the height of the center of gravity.

FIG. 4 is a diagram illustrating a gear effect.

FIG. 5 is a graph showing the height of the center of gravity of each count of the conventional golf club set and the height of the center of gravity of the embodiment of the present invention.

[Explanation of symbols]

 1 head 3 face surface HG center of gravity height G center of gravity

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaomi Hiruda 45th Kanda Higashimatsushita-cho, Chiyoda-ku, Tokyo Inside Bridgestone Sports Co., Ltd. (56) References JP-A-63-29670 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A63B 53/00

Claims (3)

(57) [Claims] 1. An iron-based golf club set in which the loft angle is increased in a predetermined order as the iron count increases , from the toe to the heel at the upper part in the cavity on the back surface of the head.
By providing a weighted portion over the width, the loft angle 2
The center of gravity height HG is 19 ± 3mm with a club of 7 ° ± 3 °
The golf club set is characterized in that the weighted portion is increased so that the height HG of the center of gravity increases as the count increases . 2. The loft angle increases as the count increases.
Iron-based golf club sets increased in regular order
And from the toe to the heel at the top inside the cavity on the back of the head
Along with providing a weighted part over the cavity,
By building up the ribs, the loft angle 27 ° ± 3
The center of gravity height HG is set to 19 ± 3mm in the club of the number of °
Then, as the number increases, the height HG of the center of gravity increases.
The weight of the thickened part or the build-up of the ribs
Golf club set characterized by the following. 3. A golf club set according to claim 1 or 2 in the loft angle 40 ° or more count club is characterized in that setting the height of center of gravity HG than 21 ± 3 mm.