JP2005261459A - Iron club set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an iron club set providing an optimal hitting sound in an iron club with relatively large loft angle and an iron club with a relatively small loft angle respectively. <P>SOLUTION: This iron club set is provided with a composite iron head 2 having a head body (h) having an opening part 8 in a face part 3a and a face plate 9 joined with the opening part 8. The rear face 9a of the face plate 9 is provided with an abutment part 4 abutting on the head body (h) in its circumferential edge part and a non-abutment part 5 non-abutting on the head body (h). This iron club set is so constituted that, when the area of the non-abutment part 5 is assumed to be S1 and the total area of the abutment part 4 and the non-abutment part 5 is assumed to S2, the minimum value of values of the ratio (S1/S2) in respective iron clubs with the loft angle less than 42° is constituted larger than the maximum value of values of the ratio (S1/S2) in respective iron clubs with the loft angle of 42° or more. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an iron club set including a plurality of iron clubs each having a face plate attached to a face portion of a head body.

  Main performances required for iron golf clubs (iron clubs) include directional stability, low center of gravity, and high resilience. As a structure of an iron golf club head (iron head) that is advantageous for high performance, a structure having a head body having an opening in a face portion and a face plate joined to the opening has been proposed. In such a structure, since the head main body has an opening, the vicinity of the center of the face member is not supported by the head main body. Therefore, the face plate is in a state of being easily bent at the time of hitting, and the resilience performance can be enhanced. In this case, by further reducing the thickness of the face plate using a high-strength material, the deflection of the face at the time of hitting can be further increased, and the resilience performance can be further enhanced. In addition, by reducing the thickness of the face plate or reducing the specific gravity of the face plate to be smaller than that of the head body and reducing the weight of the face portion, the corresponding weight is distributed to the peripheral edge or sole portion of the head, thereby reducing the moment of inertia. Increase and lower center of gravity can be achieved.

In the case of an iron head having a solid structure (for example, soft iron or stainless steel) including the face portion and a solid structure iron head, the hitting sound is low and the peak frequency thereof is relatively low. No hitting sound like that was generated, and the hitting sound hardly posed a problem. However, in the head structure described above, since the face member is separated from the head body, and the face member is not supported by the head body in the opening of the head body, the vibration of the face member during hitting is relatively low. The hitting sound with a relatively large sound pressure was easily generated. Moreover, the hitting sound of the iron head is a frequency band sound having a peak frequency of about 4000 Hz to 8000 Hz, which is often relatively high as the hitting sound, and is relatively easy for humans to hear (easy to hear). Therefore, when the sound pressure of the hitting sound increases, the influence of the hitting sound on the golfer is great.
In view of this, an iron head has been proposed that improves the hitting sound by providing an opening above the half of the head height on the back side wall of the iron head with respect to the hitting sound of the iron head (see Patent Document 1).
JP-A-11-239995 (FIGS. 1 to 3)

As a result of further investigation on the hitting sound of the iron head having the above-described structure, it was found that the hitting sound can be further improved by considering the circumstances of each iron number in the iron club set.
In other words, since the impact of the hitting sound differs among the iron clubs (each count) constituting the iron club set, it is possible to make an iron club set with excellent hitting sound by considering this. found.
In an iron club set, a club with a larger loft angle has more approach shots and shots under delicate circumstances, and a delicate feeling tends to be particularly emphasized. The club with a larger loft angle is used in a situation where the distance to the target (pin) is shorter, but the shorter the distance to the pin, the greater the impact on the score and the need for mental concentration. . This tendency is particularly remarkable in an iron club having a loft angle of 42 degrees or more. And in a scene where an iron club with a large loft angle is used, the hitting sound with a relatively high frequency as described above tends to disturb the subtle feeling and disturb the mental concentration. It turns out that there is a strong tendency to feel uncomfortable.
On the other hand, as the iron club has a smaller loft angle, the flight distance or the like tends to be more important than the delicate feeling. This tendency is particularly remarkable in an iron club having a loft angle of less than 42 degrees. Therefore, as the iron club has a smaller loft angle, the hitting sound having a relatively high frequency as described above tends to give the golfer the impression that the rebound coefficient of the head is large and the flight distance is increased, and the golf club tends to feel more comfortable. I understood.
The above prior art does not consider the circumstances of each iron number in the iron set, but this time, in the iron set, in particular, each of an iron club with a relatively large loft angle and an iron club with a relatively small loft angle It has been found that by optimizing the hitting sound in consideration of the above circumstances, an iron club set with extremely excellent hitting sound can be obtained.

  The present invention has been made in view of such a situation, and provides an iron club set capable of obtaining an optimal hitting sound in each of an iron club having a relatively large loft angle and an iron club having a relatively small loft angle. It is an object.

  The iron club set of the first invention in the present invention includes a plurality of composite iron clubs mounted with a composite iron head having a head body having an opening in the face portion and a face plate joined to the opening, An iron club set including the composite iron club having a loft angle of 42 degrees or more and the composite iron club having a loft angle of less than 42 degrees, and the back surface of the face plate is in contact with the head main body at the periphery thereof. An abutting portion that is in contact with the head main body, and an inner portion of the abutting portion that does not abut against the head body. When the total area of the non-contact portion is S2, the minimum value of the ratio (S1 / S2) in each composite iron club having a loft angle of less than 42 degrees is Wherein the loft angle is greater than the maximum value of the value of the ratio (S1 / S2) in 42 degrees of the respective composite iron club.

  In this case, in an iron club set having a plurality of composite iron clubs with the above structure, where the hitting sound is likely to be a problem, all of the composite iron clubs having a loft angle of 42 degrees or more are all of the composite iron clubs of less than 42 degrees. Since the ratio (S1 / S2) is smaller than that of the club, the hitting sound is optimized at each count in the set. That is, since the ratio (S1 / S2) is relatively small in clubs having a loft angle of 42 degrees or more, the sound pressure level of the hitting sound that is uncomfortable when hitting a club with a large loft angle is minimized. Can be suppressed. In a club having a loft angle of less than 42 degrees, the ratio (S1 / S2) is relatively large, so that the sound pressure level of the hitting sound is relatively high, and the impression that the hitting distance of the hitting ball is large is a golfer. Can be given to.

The iron club set of the second invention in the present invention includes a plurality of composite iron clubs mounted with a composite iron head having a head body having an opening in the face portion and a face plate joined to the opening, An iron club set including the composite iron club having a loft angle of 42 degrees or more and the composite iron club having a loft angle of less than 42 degrees, and the back surface of the face plate is in contact with the head main body at the periphery thereof. An abutting portion that is in contact with the head main body, and an inner portion of the abutting portion that does not abut against the head body. The total area of the non-contact portions is S2, and the ratio (S1 / S2) is set to H (1), H (2),..., H (n) (n When three or more integer), and is characterized in satisfying the following formula (A) ~ (B).
H (1) ≧ H (2) ≧ ・ ・ ・ ≧ H (n) (A)
H (1)> H (n) (B)
By doing so, the ratio of iron clubs having a relatively small loft angle (S1 / S2) is smaller than the ratio of iron clubs having a relatively large loft angle (S1 / S2) between arbitrary numbers in the set. In addition, the ratio of the number with the smallest loft angle (S1 / S2) is larger than the ratio of the number with the largest loft angle (S1 / S2). Therefore, the hitting sound of an iron club having a relatively small loft angle (which tends to favor a large hitting sound) is larger than the hitting sound of an iron club having a large loft angle (which tends to suppress the hitting sound). This makes it easier to obtain a hitting sound suitable for each count.

The ratio (S1 / S2) is 0.6 or more and 0.9 or less for a composite iron club having a loft angle of less than 42 degrees, and 0.4 or more and 0.7 for a composite iron club having a loft angle of 42 degrees or more. It is preferable that:
By setting the ratio (S1 / S2) in such a numerical range, the value of the ratio (S1 / S2) is optimized.

  According to the present invention, since the ratio (S1 / S2) in each count is appropriately set, an iron club set that can obtain an optimum hitting sound in each of a relatively large iron club and an iron club having a relatively small loft angle. It can be.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an exploded perspective view of an iron club head (hereinafter also referred to as an iron head) 1 mounted on an iron club constituting an iron club set 20 according to an embodiment of the present invention, and FIG. FIG. 3 is a cross-sectional view taken along line AA of FIG.
As shown in FIG. 1, the iron head 1 is formed by joining two members. That is, the iron head 1 includes a composite iron head 2 formed by joining a head body h having an opening 8 in the face portion 3 a and a face plate 9 as a face member joined to the opening 8. Has been. The head body h has a hosel 11 provided with a shaft hole 10 for inserting and bonding a shaft (not shown) in addition to the opening 8 (see FIG. 2). The head body h can be manufactured by casting such as lost wax precision casting or forging, and the face plate 9 can be manufactured by punching a plate material into a predetermined shape and then pressing it. Further, by applying NC processing to the inner peripheral surface of the opening 8 and the contour of the face plate 9 and adjusting the size and shape of both of them accurately, the bonding strength is increased and a good appearance is obtained. Note that a face line is usually provided on the front surface 9a of the face plate 9, but the face line is not shown in FIGS.

The opening 8 passes through the head main body h, and a face plate 9 is mounted so as to close the opening 8. More specifically, as shown in FIG. 3, the opening 8 is in contact with the front inner peripheral surface 12 having substantially the same shape as the contour shape of the face plate 9 and the back surface 9 a of the face plate 9. And a support surface 13 supported from the back side. The support surface 13 is in contact with the face plate 9 only at the periphery of the face plate 9. A face plate 9 is fitted into the front inner peripheral surface 12. 3, the front surface 9a of the face plate 9 and the front surface h1 of the head body h arranged around the face plate 9 are flush with each other to form the face surface 3, and Most of the face surface 3 is constituted by the front surface 9 a of the face plate 9.
On the other hand, the back surface 9b of the face plate 9 is a contact part 4 that contacts the support surface 13 of the head body h, and a non-contact part 5 that is an inner part of the contact part 4 and does not contact the head body h. Consists of.

  The head body h includes a sole portion 16 that extends from the face surface 3 side to the back side to form a sole surface 15 at a lower portion of the head, and a back portion 17 that extends in the top direction (upward) from the back side edge of the sole portion 16. have. By providing the back portion 17, the weight distribution on the back side and the sole side in the composite iron head 2 increases, which can contribute to an increase in the center of gravity depth of the composite iron head 2, an increase in moment of inertia, or a reduction in the center of gravity.

  As a method for joining the face plate 9 and the head main body h, for example, the face plate 9 is press-fitted into the head main body h, or a protrusion for locking is provided on the head main body h or the face plate 9 and the protrusion is provided. Each method of engaging both by using plastic deformation or using an adhesive, or a method combining these can be employed as appropriate. In the present embodiment, the entire face plate 9 has a substantially constant thickness. For example, the central portion is relatively thick (that is, the peripheral portion is relatively thin), and both strength and resilience are achieved. Needless to say, the face plate 9 may have a thickness distribution in which the thickness is appropriately changed.

As described above, the back surface 9b of the face plate 9 has a contact portion 4 (indicated by broken line hatching in FIG. 4) that contacts the support surface 13 of the head main body h at the periphery thereof, and an inner side of the contact portion 4 The non-contact part 5 which is a part and does not contact | abut with the head main body h (it shows by the continuous line hatching in FIG. 2). In the present invention, the ratio (S1 / S2) between the area S1 of the non-contact portion 5 and the total area S2 of the contact portion 4 and the non-contact portion 5 is considered. The area S2 is the sum of the area S1 of the non-contact part 5 and the area S3 of the contact part 4. That is, S2 = S1 + S3.
FIG. 2 is a view of the composite iron head 2 as seen from the face surface 3 side, and the contact part 4 and the non-contact part 5 are not visible, but each of the contact part 4 and the non-contact part 5 is shown. In order to describe the area in an easy-to-understand manner, the areas of the contact part 4 and the non-contact part 5 are shown in perspective in FIG.

  The iron club set 20 of the present embodiment includes a plurality of composite iron clubs k including the composite iron head 2 described above. Here, as shown in FIG. 4, an iron club set 20 including six composite iron clubs k is illustrated, but the iron club set of the present invention is not limited to this, and a plurality (two or more) of composite iron clubs are used. For example, an iron club other than the composite iron club k described above (for example, an iron club having a head made of a single material, a face plate 9 having a non-contact portion). An iron club set in which the entire back surface of the face plate 9 is supported by the head body h without including 5, or an iron club having a ratio (S1 / S2) outside the scope of the present invention. There may be. FIG. 4 shows only the composite iron head 2 and the tip portion of the shaft s of each composite iron club k.

As shown in FIG. 4, the iron club set 20 includes six composite iron clubs k including composite iron clubs k1, k2, k3, k4, k5, and k6 in order from the smallest loft angle. The composite iron club k having the smallest loft angle in the set 20 is the composite iron club k1, and the composite iron club k having the largest loft angle is the composite iron club k6. That is, the loft angles (real loft angles) α1, α2,..., Α6 of the composite iron clubs k1, k2,..., K6 are in the relationship of α1 <α2 <α3 <α4 <α5 <α6. is there.
The real loft angle refers to a shaft axis line and a face surface in a projected image that is projected onto a plane that includes the normal of the face surface and is perpendicular to the horizontal plane in a state where the head is placed on a horizontal plane according to a predetermined lie angle. This is the angle formed by In this case, when the face surface is a curved surface, the contact surface of the face surface at the sweet spot can be regarded as the face surface.

  Of the composite iron clubs k1, k2,..., K6, the loft angle is less than 42 degrees is the composite iron club k1, k2, k3, k4, and the loft angle is 42 degrees or more. Are composite iron clubs k5 and k6. That is, the above-described loft angles α1, α2,..., Α6 (all in units) have a relationship of α1 <α2 <α3 <α4 <(42 degrees) ≦ α5 <α6.

The ratio (S1 / S2) in each of the composite iron clubs k1, k2,..., K6 is H (1), H (2),..., H (6), and the loft angle is 42 degrees. The minimum value among the ratios (S1 / S2) values H (1), H (2), H (3), and H (4) in each of the less than clubs k1 to k4 is P1, and the loft angle is 42 degrees. When the maximum value of the ratios (S1 / S2) values H (5) and H (6) in each of the clubs k5 and k6 is P2, the iron club set 20 of the present embodiment has the following formula (A ) To (C) are satisfied.
H (1) ≧ H (2) ≧ ・ ・ ・ ≧ H (6) (A)
H (1)> H (6) (B)
P1> P2 (C)
Furthermore, the values H (1), H (2), H (3), and H (4) of the ratio (S1 / S2) in each of the clubs k1 to k4 having a loft angle of less than 42 degrees are all 0.6 or more and 0. The ratios (S1 / S2) of the clubs k5 and k6 having a loft angle of 42 degrees or more and H (5) and H (6) are both 0.4 or more and 0. .7 or less.

The effects of the iron club set 20 configured as described above will be described.
An iron head having a head main body having an opening in the face portion and a face plate joined to the opening, and further provided with a non-contact portion that does not contact the head main body on the back surface of the face plate. In this case, since the face plate is separate from the head body, and part of the face plate is not supported by the head body, the entire head is integrally formed with a single member, or the entire face plate is Compared with the head supported by the head body, the face plate tends to vibrate when hitting. Therefore, the sound pressure of the hitting sound at the time of hitting is relatively large. In addition, the hitting sound has a peak frequency of about 4000 Hz to 8000 Hz and is often a relatively high pitched hitting sound, and is a sound in a frequency band that is relatively easy for humans to hear (easy to hear). Therefore, when the sound pressure of the hitting sound increases, the influence of the hitting sound on the golfer is great. In the iron club set 20 of the present embodiment, the ratio (S1 / S2) is set to obtain an appropriate hitting sound for each count.

  That is, in the iron club set 20, since the above-described formula (C), that is, P1> P2 is satisfied, the composite iron clubs k5 and k6 having a loft angle of 42 degrees or more are combined with less than 42 degrees. The ratio (S1 / S2) is smaller than any of the iron clubs k1 to k4. Then, the ratio (S1 / S2) is relatively small in a club having a loft angle of 42 degrees or more, and the sound pressure level of the hitting sound that is felt uncomfortable in the hitting in a club having a large loft angle is relatively small. In a club having a loft angle of less than 42 degrees, the ratio (S1 / S2) is relatively large, the sound pressure level of the hitting sound is relatively high, and it is easy to give the golfer the impression that the hit distance of the hitting ball is large. Become.

Further, the following formula (A) and formula (B),
H (1) ≧ H (2) ≧ ・ ・ ・ ≧ H (n) (A)
H (1)> H (n) (B)
Are all true. However, H (n) is the ratio (S1 / S2) of the club with the largest loft angle in the above-described composite iron club set, and H (6) corresponds to the above-mentioned iron club set 20. H (1) is the ratio (S1 / S2) of the club having the smallest loft angle. Therefore, when comparing any two clubs in the set 20 from the formula (A), the ratio of iron clubs having a relatively small loft angle (S1 / S2) is a ratio of iron clubs having a relatively large loft angle. It is never smaller than (S1 / S2). Further, from the formula (B), the ratio of the count with the smallest loft angle (S1 / S2) is made larger than the ratio of the count with the largest loft angle (S1 / S2). Therefore, the hitting sound of an iron club having a relatively small loft angle (which tends to favor a large hitting sound) is larger than the hitting sound of an iron club having a large loft angle (which tends to suppress the hitting sound). This makes it easier to obtain a hitting sound suitable for each count.

  The ratio of H (1) to H (n) [H (1) / H (n)] is preferably 1.1 or more, more preferably 1.2 or more, and further preferably 1.3 or more. 1.4 or more is particularly preferable. If the ratio [H (1) / H (n)] is too small, the sound pressure level of the hitting sound becomes too low in a club with a loft angle of less than 42 degrees, or the hitting sound of a club with a loft angle of 42 degrees or more. The sound pressure level may become too high. The ratio [H (1) / H (n)] is preferably 2.0 or less, more preferably 1.8 or less, and still more preferably 1.6 or less. If the ratio [H (1) / H (n)] is too large, the non-contact portion 5 becomes too wide in a club having a loft angle of less than 42 degrees, resulting in insufficient face strength, or a loft angle of 42 degrees or more. In some clubs, the contact portion 4 becomes too wide, and the resilience performance may be excessively lowered.

  Then, as in the above embodiment, in a club having a loft angle of less than 42 degrees, the ratio (S1 / S2) is preferably 0.6 or more, more preferably 0.65 or more, and 0.7 or more. Is more preferable. In this case, if the ratio (S1 / S2) is too small, the area S1 of the non-contact portion 5 is too small and the sound pressure level of the hitting sound becomes too small, or the rigidity of the face plate 9 becomes too high and The resilience performance may decrease. For clubs with a loft angle of less than 42 degrees, the ratio (S1 / S2) is preferably 0.9 or less, and more preferably 0.8 or less. In this case, if the ratio (S1 / S2) is too large, the face strength of the head may be insufficient. Further, when the ratio (S1 / S2) is too large, the area S3 of the contact portion 4 tends to be small, and thus the area of the support surface 13 of the head main body h tends to be small. If it does so, it will become the tendency for the thickness of the head main-body part (ring-shaped part) which exists around the opening part 8 to become thin. In this case, the rigidity and strength of the head main body h may be insufficient. In particular, when adopting a method of press-fitting the face plate 9 into the head main body h as a method of manufacturing the composite iron head 2, the head main body h is caused by the press-fitting stress at the time of the press-fitting. h is easily deformed.

  On the other hand, in a club having a loft angle of 42 degrees or more, the ratio (S1 / S2) is preferably 0.7 or less, more preferably 0.65 or less, and even more preferably less than 0.65. , 0.6 or less is particularly preferable. If the ratio (S1 / S2) is too large, the sound pressure level of a relatively high frequency hitting sound that tends to be particularly uncomfortable when hitting a club with a loft angle of 42 degrees or more tends to be too high. . In a club having a loft angle of 42 degrees or more, the ratio (S1 / S2) is preferably 0.4 or more, more preferably 0.45 or more, and further preferably 0.5 or more. . If the ratio (S1 / S2) is too small, the balance in the iron club set (the balance of the design flow from the low loft to the large count) may deteriorate in terms of head design.

Also, the range of loft angles at each count in the iron club set, and the upper and lower limit values (unit: cm ² ) of the preferable ranges of the area S1 and area S2 in each of the clubs of each loft angle are summarized. Is Table 1 below.

The reason why the area S1 and the area S2 shown in Table 1 are preferable will be described.
In a club having a loft angle of less than 42 degrees, if the area S1 is too small, the sound pressure level of the hitting sound may be too small, or the rigidity of the face plate 9 may be too high and the rebound performance of the head may be reduced. is there. Further, if the club has a loft angle of less than 42 degrees and the area S1 is too large, the face strength of the head may be insufficient.
On the other hand, in a club with a loft angle of 42 degrees or more, if the area S1 is too large, the sound pressure level of a hitting sound with a relatively high frequency, which is particularly uncomfortable when hitting with a club with a loft angle of 42 degrees or more, is obtained. It tends to be too large. In addition, in a club having a loft angle of 42 degrees or more, if the area S1 is too small, the balance in the iron club set (the balance of the design flow from a loft with a small loft to a large count) becomes poor in terms of head design. There is a case.
Then, considering the face area of each iron head in a general iron club set, the shape balance in the iron club set (flow in the shape set), and the preferred range of the ratio (S1 / S2) described above, The range of the area S2 described in 1 is preferable. In a general iron club set, the face area tends to be wider as the club has a larger loft. Therefore, regarding the areas S1 and S2 in the preferable range of Table 1, the clubs with a loft angle of less than 42 degrees tend to have larger areas S1 and S2 as the club has a larger loft angle.

  As described above, any thickness distribution of the face plate 9 can be adopted. However, the thickness (absolute value) of the non-contact portion 5 in the face plate 9 is preferably 3.5 mm or less. 3.0 mm or less is more preferable. If the thickness of the non-contact portion 5 is too thick, the vibration of the face plate 9 is reduced, the sound pressure level of the hitting sound is reduced and it is difficult to hear, and the significance of applying the present invention may be reduced. Further, if the thickness of the non-contact portion 5 in the face plate 9 is too thin, the face strength may be lowered.

  In the present invention, the material of the head main body h and the face plate 9 is not particularly limited, but the face plate 9 is preferably a titanium alloy having high strength and capable of being thinned. Examples of the titanium alloy include 6Al-4V titanium, 15V-3Cr-3Al-3Sn titanium, 15Mo-5Zr-3Al titanium, 13V-11Cr-3Al titanium, and the like. Among these, particularly high strength 15V-3Cr Β-type titanium alloys such as −3Al-3Sn titanium are preferred. As the head body h, a material having a specific gravity higher than that of the face plate 9 is preferable from the viewpoint of improving the moment of inertia of the head (distribution around the weight). For example, a stainless alloy such as SUS630 that is relatively easy to cast and relatively inexpensive. Is preferred.

In the present invention, the length L of the line of intersection ks between the non-contact portion 5 and the plane that crosses the non-contact portion 5 the shortest in the plane passing through the center of gravity z of the back surface 9b of the face plate 9 (see FIG. 2) is preferably 20 mm or more, and more preferably 25 mm or more. When the length L is short, the vibration of the face plate 9 is suppressed, the sound pressure level of the hitting sound becomes too small, and the hitting sound becomes difficult to hear. Therefore, the significance of applying the present invention decreases, and the face There is a case where the amount of deflection at the time of hitting the plate 9 is reduced and the coefficient of restitution is lowered. If the length L is too long, the face strength may be insufficient. Therefore, the length L is preferably 45 mm or less, and more preferably 40 mm or less.
In an iron club having a loft angle of 42 degrees or more, the length L is preferably 40 mm or less, and more preferably 35 mm or less. This is because, in an iron club having a loft angle of 42 degrees or more, if the length L is too long, the sound pressure level of the hitting sound becomes too high, and the player's feeling tends to be adversely affected or uncomfortable. .
Further, in an iron club having a loft angle of less than 42 degrees, the length L is preferably 25 mm or more, and more preferably 30 mm or more. In an iron club having a loft angle of less than 42 degrees, if the length L is too short, the sound pressure level of the hitting sound may be too small, making it difficult to receive the impression that the flight distance has increased.

  The minimum value P1 of the ratio (S1 / S2) in each iron club having a loft angle of less than 42 degrees and the maximum value P2 of the ratio (S1 / S2) in each iron club having a loft angle of 42 degrees or more The ratio (P1 / P2) is preferably 1.1 or more, and more preferably 1.2 or more. If the ratio (P1 / P2) is too small, the non-contact portion 5 of the club with a loft angle of 42 degrees or more becomes large and the hitting sound becomes too loud, or the non-contact portion of the club with a loft angle of less than 42 degrees This is because 5 may be small and the hitting sound may be too small. The ratio (P1 / P2) is preferably 1.5 or less, and more preferably 1.4 or less. If the ratio (P1 / P2) is too large, the contact portion 4 of the club having a loft angle of 42 degrees or more becomes large and the resilience performance is excessively lowered, or the non-contact portion of the club having a loft angle of less than 42 degrees This is because 5 may increase and the face strength may decrease excessively.

In order to confirm the effect of the present invention, a total of four types of iron club sets of Examples 1 and 2 and Comparative Examples 1 and 2 were prepared and evaluated.
In all the examples and all the comparative examples (hereinafter also referred to as all examples), the same shaft and grip were used, and the head weight and the total club weight were also common to each number. Furthermore, in all the examples, the face plate 9 is produced by punching out a plate material of titanium alloy (6Al-4V titanium) with a predetermined contour shape and then cutting it into a predetermined wall thickness distribution with an NC processing machine. did. In all examples, the head body h was made of SUS630 stainless steel by the lost wax precision casting method. Then, the head main body h and the face plate 9 were joined by using both caulking press-fitting and adhesive bonding.
In addition, all the examples are iron sets including a total of 10 pieces of # 3 (3 iron) to # 9 (9 iron), PW (pitching wedge), AW (approach wedge) and SW (sand wedge). . The loft angle of each count is shown in Tables 1 to 4 described later. The club length is also common to all examples, and the length system is the same as that of a normal iron club set.
Tables 2 to 5 summarize the club specifications and evaluation results in each set.

The “sound pressure level” in Tables 2 to 5 is a ball hitting sound by hitting a commercially available three-piece golf ball (registered trademark HI-BRID everio manufactured by SRI Sports) with a swing robot with a sweet spot. Was measured and wavelet analysis was performed to determine the sound pressure level (maximum value in the hitting sound). The unit is dB (dBSPL). The striking head speed for measuring the sound pressure level was set as follows.
# 3 (No. 3 iron) head speed: 35.5m / s
# 4 (4 iron) head speed: 35.0 m / s
# 5 (5 iron) head speed: 34.5m / s
# 6 (6 iron) head speed: 34.0m / s
# 7 (7 iron) head speed: 34.0m / s
# 8 (8 iron) head speed: 33.50 m / s
Head speed of # 9 (9 iron): 33.5m / s
PW (pitching wedge) head speed: 33.0 m / s
AW (approach wedge) head speed: 33.0 m / s
SW (sand wedge) head speed: 33.0 m / s

The evaluation was performed by hitting 10 golfers with handicap of 10-20. As a ball, registered trademark HI-BRID everio manufactured by SRI Sports Co., Ltd. was used. The 10 golfers evaluated the hitting sound at each club in the following three stages in view of the number of each club.
Evaluation A: Too loud as the hitting sound of the count.
Evaluation B: The hitting sound of the count is too small.
Evaluation C: Good as the hitting sound of the count.
In the table, the number of people who gave an evaluation A for each club number was “Evaluation A”, and the number of people who made an evaluation B was “Evaluation B”. Therefore, the number of people who gave evaluation C in each club is [10− (number of evaluation A + number of evaluation B)].
As can be seen from the results in Tables 2 to 5, the Examples had a smaller sum of [(Evaluation A Number) + (Evaluation B Number)] than the Comparative Examples, and good results were obtained.

It is a disassembled perspective view of the iron head with which the iron club which comprises the iron club set which is one Embodiment of this invention was mounted | worn. It is the front view which looked at the iron head of Drawing 1 from the face side. It is sectional drawing in the AA of FIG. It is the figure which looked at the iron club set which is one Embodiment of this invention from the toe side of the head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Iron head 2 Composite iron head 3a Face part 4 Contact part 5 Non-contact part 8 Opening part 9 Face plate 9b The back surface of a face plate 20 Iron club set h Head main body k Composite iron club

Claims (3)

The composite iron club including a plurality of composite iron clubs to which a composite iron head having a head body having an opening in a face portion and a face plate bonded to the opening is mounted, and having a loft angle of 42 degrees or more; An iron club set having the composite iron club having a loft angle of less than 42 degrees,
The back surface of the face plate is provided with a contact portion that comes into contact with the head main body at a peripheral portion thereof and a non-contact portion that is an inner portion of the contact portion and does not come into contact with the head main body. ,
When the area of the non-contact portion is S1 and the total area of the contact portion and the non-contact portion is S2, the ratio (S1 / S2) in each composite iron club having a loft angle of less than 42 degrees. The iron club set characterized in that the minimum value is larger than the maximum value of the ratio (S1 / S2) in each composite iron club having a loft angle of 42 degrees or more. The composite iron club including a plurality of composite iron clubs to which a composite iron head having a head body having an opening in a face portion and a face plate bonded to the opening is mounted, and having a loft angle of 42 degrees or more; An iron club set having the composite iron club having a loft angle of less than 42 degrees,
The back surface of the face plate is provided with a contact portion that comes into contact with the head main body at a peripheral portion thereof and a non-contact portion that is an inner portion of the contact portion and does not come into contact with the head main body. ,
The area of the non-contact portion is S1, the total area of the contact portion and the non-contact portion is S2, and the value of the ratio (S1 / S2) is H (1) in order from the smallest loft angle. An iron club set characterized by satisfying the following formulas (A) to (B) when H (2),..., H (n) (n is an integer of 3 or more).
H (1) ≧ H (2) ≧ ・ ・ ・ ≧ H (n) (A)
H (1)> H (n) (B)   The ratio (S1 / S2) is 0.6 or more and 0.9 or less for a composite iron club having a loft angle of less than 42 degrees, and 0.4 or more and 0.7 for a composite iron club having a loft angle of 42 degrees or more. The iron club set according to claim 1 or 2, wherein:

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