JP2013000161A - Iron golf club head and iron golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron golf club head and an iron golf club enabling smooth swing.SOLUTION: The iron golf club head 10 includes: a face part 1; a back part 2 located in the rear of the face part 1; and a sole part 3 which connects the face part 1 with the back part 2. The ratio of the horizontal distance D from the front end 3f of the sole part 3 to the lowest point 3m of the sole part 3 in the longitudinal direction BF from the face part 1 toward the back part 2, relative to the height H from the lowest point 3m of the sole part 3 to the lowest end edge 1m of a planar portion 1a of the face part 1 in a cross section perpendicular to a score line passing through the lowest point 3m of the sole part 3 and engraved in the face part 1, is 1.7 or less. The ratio of the horizontal distance D from the front end 3f of the sole part 3 to the lowest point 3m of the sole part 3 in the longitudinal direction BF relative to the width W in the longitudinal direction BF of the sole part 3 is 0.6 or less.

Description

  The present invention relates to an iron golf club head and an iron golf club.

  In an iron golf club, an accurate shot for accurately dropping a golf ball onto a green or the like is more important than a flight distance of the golf ball. In order to realize an accurate shot, it is required to reduce the rolling (run) after the golf ball falls on a green or the like. In order to reduce the run, it is effective to increase the backspin amount of the golf ball.

  For example, in Japanese Patent Application Laid-Open No. 2005- 211560 (Patent Document 1), golf that aims to fly and stop the golf ball at an accurate position by giving a larger amount of backspin to the golf ball than before. The club head is disclosed.

JP 2005-111560 A

  In order to realize an accurate shot, in addition to reducing the above-mentioned run, it is required to stabilize the directionality of the hit ball. In order to stabilize the directionality of the hit ball, it is effective to improve the swing of the iron golf club head.

  However, in the golf club head described in the above publication, the backspin amount is increased by the gear effect due to the rotation of the face portion that occurs when the lowest point of the sole surface comes into contact with the ground when hitting the golf ball. At this time, the face portion greatly rotates in the direction opposite to the direction in which the golf club head is shaken out. Due to the rotation of the face portion, the swing-out of the golf club head becomes worse.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an iron golf club head and an iron golf club with good swing-through.

  The iron golf club head of the present invention includes a face portion, a back portion located behind the face portion, and a sole portion that connects the face portion and the back portion. In the cross section perpendicular to the score line carved in the face part through the lowest point of the sole part, the face part to the back part with respect to the height from the lowest point of the sole part to the lowermost edge of the flat part of the face part The ratio of the horizontal distance from the front end of the sole portion to the lowest point of the sole portion in the front-rear direction toward the bottom is 1.7 or less, and the front end of the sole portion in the front-rear direction to the width of the sole portion in the front-rear direction The ratio of the horizontal distance to the lowest point of the part is 0.6 or less.

  Here, the lowest point of the sole part is the most of the sole part in a state where the iron golf club head is installed on the horizontal plane so as to form the set loft angle and lie angle (hereinafter referred to as an installed state). It means the point located below. Also, the lowermost edge of the flat portion of the face portion means the lowermost end of the flat portion of the face portion in a cross section cut through the lowermost point of the sole portion and perpendicular to the score line on the face. Yes. Further, the front-rear direction from the face part toward the back part means a direction from the face part toward the back part in parallel to the horizontal plane in the installed state.

  The inventors have a large value of the ratio (Speed ratio) of the speed (Speed out) of the iron golf club head between two points immediately after the impact to the speed (Speed in) of the iron golf club head between the two points immediately before the impact. I found out that the swing was good.

  Then, the inventors have intensively studied and found that the sole portion from the front end of the sole portion in the front-rear direction from the face portion toward the back portion with respect to the height from the lowest point of the sole portion to the lowermost edge of the flat portion of the face portion. The ratio of the horizontal distance to the lowest point is 1.7 or less, and the ratio of the horizontal distance from the front end of the sole part to the lowest point of the sole part in the front-rear direction with respect to the width in the front-rear direction of the sole part is 0 It was found that the value of Speed ratio increases by being .6 or less. That is, this can improve the swing of the iron golf club head.

  In the above iron golf club head, preferably, the sole portion includes a chamfered portion provided so as to shorten the length of the horizontal distance from the front end of the sole portion to the lowest point of the sole portion. Since the chamfered portion is provided to shorten the length of the horizontal distance from the front end of the sole portion to the lowest point of the sole portion, the contact area between the bottom surface of the sole portion and the turf and the ground can be suppressed. it can. Therefore, it is possible to further improve the swing-out of the iron golf club head.

  The iron golf club head described above preferably has a loft angle of 48 ° or more. The present invention is particularly useful for wedge iron golf club heads having loft angles of 48 ° or greater.

  The iron golf club of the present invention includes a shaft, a grip attached to one end of the shaft, and the above-described iron golf club head attached to the other end of the shaft opposite to the grip. Thereby, an iron golf club with good swing-through can be obtained.

  As described above, according to the iron golf club head and the iron golf club of the present invention, it is possible to improve the swing-through of the iron golf club head and the iron golf club.

It is a schematic front view of the iron golf club head in one embodiment of the present invention. It is a schematic sectional drawing in alignment with the II-II line of FIG. It is a schematic enlarged view of the P section of FIG. It is a schematic back view of the iron golf club in one embodiment of the present invention. FIG. 4 is a schematic enlarged cross-sectional view of a modified iron golf club head according to an embodiment of the present invention, and is a schematic enlarged cross-sectional view at a cross-sectional position corresponding to FIG. 3. It is a schematic back view of the iron golf club of the modification in one embodiment of this invention. It is a figure which shows the relationship between Speed ratio of this invention Examples 1-2 and Comparative Examples 3-7, and D / H. It is a figure which shows the relationship between Speed ratio and D / W of this invention Examples 1-2 and Comparative Examples 3-7. It is a figure which shows the relationship between Speed ratio of this invention Examples 1-2 and Comparative Examples 3-7, and a backspin amount. It is a figure which shows the relationship between Speed ratio and D / H of this invention examples 11-12 and comparative examples 13-17. It is a figure which shows the relationship between Speed ratio and D / W of this invention examples 11-12 and comparative examples 13-17. It is a figure which shows the relationship between Speed ratio of this invention examples 11-12 and comparative examples 13-17, and a backspin amount.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, the configuration of an iron golf club head according to an embodiment of the present invention will be described.

  1 is a front view of an iron golf club head according to the present embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is an enlarged view of a region surrounded by reference numeral P in FIG. Represents each.

  Referring to FIGS. 1 to 3, an iron golf club head 10 includes a face portion 1, a back portion 2, a sole portion 3, a hosel portion 4, a score line portion 5, a leading edge portion 6, and a toe portion. It mainly has a portion 7, a heel portion 8, and a top edge portion 9.

  The face portion 1 has a flat portion 1a. The flat surface portion 1a constitutes a ball striking surface. A plurality of score line (groove) portions 5 are formed on the ball striking surface of the face portion 1. The plurality of score line portions 5 are formed at substantially equal intervals in a direction that longitudinally cuts the ball striking surface of the face portion 1, and are formed in a straight line in a direction crossing the ball striking surface. The face portion 1 has a curved portion 1 b that curves from the flat portion 1 a toward the leading edge portion 6.

  The back part 2 is located behind the face part 1 (back face). Around the face portion 1, a sole portion 3, a hosel portion 4, a leading edge portion 6, a toe portion 7, a heel portion 8 and a top edge portion 9 are located. The sole portion 3 is provided so as to connect the face portion 1 and the back portion 2. The sole portion 3 is formed in a convex shape downward in both the side view and the front view in the installed state. The sole portion 3 is a portion constituting the bottom portion of the iron golf club head 10.

  The hosel part 4 is a part connected to the shaft (FIG. 4). The leading edge portion 6 is a portion where the face portion 1 and the sole portion 3 are in contact with each other. The toe part 7 is a part that connects the top edge part 9 and the sole part 3 on the side away from the hosel part 4. The heel portion 8 is a portion extending from the lower end of the hosel portion 4 to the sole portion 3. The top edge portion 9 is a portion constituting an upper end edge portion of the iron golf club head 10 extending from the hosel portion 4 to the toe portion 7.

  Referring to FIGS. 2 and 3, in the iron golf club head 10, the face portion 1 with respect to the height H from the lowest point 3 m of the sole portion 3 to the lowest end edge 1 m of the flat portion 1 a of the face portion 1. The ratio (D / H) of the horizontal distance D from the front end 3f of the sole portion 3 to the lowest point 3m of the sole portion 3 in the front-rear direction BF toward the back portion 2 is 1.7 or less. Yes.

  Here, the lowest point 3m of the sole part 3 is the position of the sole part 3 when the iron golf club head is installed (installed state) on the horizontal plane HP so as to form the set loft angle LO and lie angle LI. This is the lowest point. Further, the lowermost edge 1m of the flat surface portion 1a of the face portion 1 passes through the lowermost point 3m of the sole portion 3 and is a face portion in a cross section (lowermost point cross section CS1) cut perpendicularly to the score line portion 5. 1 is the lowest end of the flat portion 1a. The front end 3 f of the sole portion 3 is located at the leading edge portion 6.

  The height H is a vertical distance between the lowest point 3 m of the sole portion 3 and the lowermost edge 1 m of the flat surface portion 1 a of the face portion 1. The distance D is a horizontal distance between the lowest point 3m of the sole part 3 and the most protruding part (front end of the sole part 3) 3f of the leading edge part 6 in the lowest point cross section CS1. That is, in the lowest point cross section CS1, it is a horizontal distance between the lowest point 3m of the sole part 3 and a point where an imaginary straight line standing perpendicularly to the horizontal plane HP from the most protruding part 3f contacts the horizontal plane HP.

  In the iron golf club head 10, the ratio of the horizontal distance D from the most protruding portion (front end of the sole portion 3) 3 f in the front-rear direction BF to the width 3 W in the front-rear direction BF of the sole portion 3 to the lowest point 3 m of the sole portion 3. (D / W) is configured to be 0.6 or less.

  Here, the front-rear direction BF from the face portion 1 toward the back portion 2 is a direction from the face portion 1 toward the back portion 2 parallel to the horizontal plane HP in the installed state. The width W in the front-rear direction BF of the sole portion 3 is such that the most protruding portion 3f of the leading edge portion 6 in the lowest point cross section CS1 and the rear end 3b of the sole portion 3, that is, the back portion 2 and the sole portion 3 It is a horizontal distance with the trailing edge part used as a connection point.

  The loft angle LO of the iron golf club head 10 may be the loft angle LO of the normal iron golf club head 10. Iron golf club head 10 may be set to have a loft angle LO of, for example, 16 ° or more and 64 ° or less. The iron golf club head 10 is preferably configured to have a loft angle LO of 48 ° C. or higher.

  The iron golf club head 10 can be manufactured using a material including, for example, JIS standard S25C. Further, as a material of the iron golf club head 10, spring steel, maraging steel, stainless steel, or the like can be applied. The iron golf club head 10 may be manufactured by forging. Further, the iron golf club head 10 may be plated. The plating may be, for example, Ni (nickel) -Cr (chromium) plating.

  Referring to FIG. 4, an iron golf club 20 is configured by combining an iron golf club head 10 with a shaft 21 and a grip 22. The iron golf club 20 includes a shaft 21, a grip 22 attached to one end of the shaft 21, and an iron golf club head 10 attached to the other end opposite to the grip 22 of the shaft 21. Note that well-known shafts 21 and grips 22 can be employed. A socket 23 is attached to the shaft 21 so as to be adjacent to the hosel portion 4 of the iron golf club head 10.

  Further, the back portion 2 of the iron golf club head 10 may be chamfered at a portion continuous with the sole portion 3.

  Referring to FIGS. 5 and 6, iron golf club head 10 of Modification 1 of one embodiment of the present invention is chamfered at a portion continuous with sole portion 3 with reference to rear end 3 b of sole portion 3. A portion (tapered portion) 11 is provided. The chamfered portion 11 is provided so as to shorten the distance D of the sole portion 3. The chamfered portion 11 is configured to remove the rear end of the sole portion 3 on the back portion 2 side.

Next, the function and effect of the embodiment of the present invention will be described.
The inventors of the present invention have a good swing-through when the ratio of the speed of the iron golf club head 10 between two points immediately after the impact to the speed of the iron golf club head 10 between two points immediately before the impact is large. I found.

  As a result of intensive studies by the inventors, the longitudinal direction BF from the face portion 1 toward the back portion 2 with respect to the height H from the lowest point 3m of the sole portion 3 to the lowest end edge 1m of the flat surface portion 1a of the face portion 1 is shown. The ratio (D / H) of the distance D from the front end 3f of the sole part 3 to the lowest point 3m of the sole part 3 is 1.7 or less, and the longitudinal direction with respect to the width W of the longitudinal direction BF of the sole part 3 The finding that the ratio of the distance D (D / W) from the front end 3f of the sole part 3 to the lowest point 3m of the sole part 3 at BF is 0.6 or less increases the value of Speed ratio. It was. In other words, this can improve the swing-out of the iron golf club head 10. Therefore, an accurate shot can be realized by improving the swing of the iron golf club head 10.

  Further, as a result of examination by the inventors, the ratio of the distance D to the height H (D / H) is 1.7 or less, and the ratio of the distance D to the width W (D / W) is 0.1. It was found that the backspin amount can be increased by being 6 or less. The reason why the backspin amount can be increased is considered as follows. By improving the swing-through of the iron golf club head 10, it is possible to suppress the speed reduction of the iron golf club head 10 before and after impact. As a result, the contact area between the golf ball and the iron golf club head 10 can be increased, so that the backspin amount can be increased.

  For this reason, the spin performance of the iron golf club head 10 can be improved. Therefore, according to the iron golf club head 10, the run can be reduced by increasing the backspin amount. This also makes it possible to realize an accurate shot.

  In the iron golf club head 10 according to the embodiment of the present invention, the sole portion 3 includes a chamfered portion 11 provided on the basis of the rear end 3b of the sole portion 3 so as to shorten the length of the distance D. It is preferable. Since the chamfered portion 11 is provided so as to shorten the length of the distance D of the sole portion 3, the position of the lowest point 3m can be adjusted without changing the length of the width W of the sole portion 3. , D / W and D / H can be arbitrarily adjusted. Further, by providing the chamfered portion 11, the contact area between the bottom surface 12 of the sole portion 3, the turf and the ground can be suppressed. Therefore, it is possible to further improve the swing of the iron golf club head 10.

  In the iron golf club head 10 according to one embodiment of the present invention, the iron golf club head 10 preferably has a loft angle of 48 ° or more. The iron golf club head 10 according to one embodiment of the present invention is particularly useful (effective) for a wedge iron golf club head having a loft angle of 48 ° or more.

  An iron golf club 20 according to an embodiment of the present invention includes the iron golf club head 10 described above. Thereby, the iron golf club 20 with good swing-through can be obtained.

  Examples of the present invention will be described below. In addition, the same reference number is attached | subjected to the part which is the same as that of the above, or the same, The description may not be repeated.

  In Table 1, Examples 1-2 of the present invention are examples of the present invention. Comparative Examples 3 to 7 are comparative examples for the present invention. Invention Examples 1-2 and Comparative Examples 3-7 are iron golf clubs 20 having the specifications shown in Table 1. The iron golf clubs 20 of Examples 1-2 of the present invention and Comparative Examples 3-7 are wedges having a loft angle of 48 °.

  The symbols D, W, and H in Table 1 indicate the same symbols in FIG. The symbol D / H in Table 1 indicates the ratio of the distance D to the height H, and D / W indicates the ratio of the distance D to the width W. The values of D (mm), W (mm), and H (mm) in Table 1 indicate the dimensions of the same symbols in FIG. Further, the value of Sr in Table 1 indicates the value of Speed ratio, and BS (rpm) indicates the amount of backspin (the number of backspin rotations per minute).

A method for measuring the speed ratio will be described.
Using FASTCAM-MAX120KC manufactured by Photoron Co., Ltd., before and after impact when hitting a golf ball with the iron golf club 20 of Examples 1-2 of the present invention and Comparative Examples 3-7. The photo was taken from about 1.6m ahead from the front of the test hitter. The resolution was 1024 × 256 dots. 120 frames were recorded at 8000 frames per second and a shutter speed of 1/24000 seconds.

  The frame immediately before the impact was visually confirmed from the photographed photos. The tip of the exposed shaft portion and 20 mm above the tip of the exposed shaft portion were digitized. Then, the screen coordinates were converted to real coordinates. The X coordinate axis was parallel to the horizontal plane. The Y seat axis was perpendicular to the horizontal plane.

  The speed (Speed in) of the iron golf club head 10 between two points immediately before the impact was calculated from the frame immediately before the impact and the frame 15/8000 seconds before that frame. On the other hand, the speed (Speed out) of the iron golf club head 10 between two points immediately after the impact was calculated from the frame from which the ball was separated after the impact and the frame 40/8000 seconds after that. Then, the ratio (Speed ratio) of the speed (Speed out) of the iron golf club head 10 between the two points immediately after the impact to the speed (Speed in) of the iron golf club head 10 between the two points immediately before the impact was calculated.

A method for measuring the backspin amount will be described.
Using a mechanical golfer manufactured by Miyamae Co., Ltd., golf balls were hit with the iron golf clubs 20 of the present invention examples 1 and 2 and comparative examples 3 to 7, and the number of rotations per minute of back spin was measured. Specifically, the number of backspin rotations per minute when the head speed was set to 17.3 m / sec was measured.

  With the iron golf clubs 20 of Invention Examples 1-2 and Comparative Examples 3-7, five golf balls were hit each. In the column of BS (rpm) in Table 1, an average value for each number of backspin rotations of golf balls hit by five balls is shown. The golf ball used was Titleest Pro V1. The positions of the hit points are the score line center (the central portion in the longitudinal direction of the score line portion 5 of the face portion 1), the second score line portion 5 from the top edge portion 9, and the third score line portion 5 from the sole portion 3. And between. The number of backspin rotations per minute of the golf ball was measured with a trajectory measuring instrument Trackman manufactured by Interactive Sports Games.

  With reference to Table 1 and FIG. 7, the value of Speed ratio of this invention example 1 and this invention example 2 became 0.950 or more and 0.953 or less. On the other hand, the value of Speed ratio of Comparative Examples 3 to 7 was 0.883 or more and 0.922 or less. From this, it was found that the value of Speed ratio of Invention Example 1 and Invention Example 2 was larger than the value of Speed ratio of Comparative Examples 3-7.

  The D / H values of Invention Example 1 and Invention Example 2 were 1.5 or more and 1.7 or less. On the other hand, the D / H values of Comparative Examples 3 to 7 were 1.7 or more and 2.8 or less. The D / H value of Comparative Example 3 was 1.7, but the speed ratio value was 0.901, which was smaller than Invention Example 1 and Invention Example 2.

  With reference to Table 1 and FIG. 8, the D / W values of Invention Example 1 and Invention Example 2 were 0.500 or more and 0.600 or less. On the other hand, the D / W values of Comparative Examples 3 to 7 were 0.600 or more and 0.862 or less. The D / W value of Comparative Example 4 was 0.600, but the speed ratio value was 0.905, which was smaller than Invention Example 1 and Invention Example 2.

  From the above, it was found that when the D / H value is 1.7 or less and the D / W value is 0.6 or less, the speed ratio value increases.

  Furthermore, the inventors of the present application conducted a test hit test with five subjects (subjects A to E) for each of the iron golf clubs 20 of Examples 1 to 2 and Comparative Examples 3 to 7.

  Referring to Table 2, ◯ in the table indicates that the swing-through is good, Δ indicates that the swing-through is normal, and x indicates that the swing-through is bad. As shown in Table 2, all the subjects who performed the test hit test determined that the golf golf club 20 of the present invention example 1 and the present invention example 2 had good swing-through. On the other hand, in Comparative Examples 3 to 7, none of the subjects determined that the swing-through was good.

  And when looking at the evaluation of swing-through in the order of Invention Example 2, Invention Example 1 and Comparative Example 6 having a high speed ratio, if the value of Speed ratio is at least larger than that of Invention Example 1, It can be seen that the evaluation of the swing-through is reliably increased. That is, when the value of D / H is 1.7 or less and the value of D / W is 0.6 or less, a value of Speed ratio with good swing-through evaluation can be obtained.

  Moreover, with reference to Table 1 and FIG. 9, the value of the backspin amount of the present invention example 1 and the present invention example 2 was 5180 rpm or more and 5200 rpm or less. On the other hand, the value of the backspin amount of Comparative Examples 3 to 7 was 4653 rpm or more and 5024 rpm or less. From this, it was found that the values of the backspin amounts of Invention Example 1 and Invention Example 2 were larger than those of Comparative Examples 3-7.

  For Invention Examples 1 and 2 and Comparative Examples 3 to 7, the order of the value of the speed ratio and the order of the value of the backspin amount are the same. Therefore, it was found that the value of the speed ratio is proportional to the value of the backspin amount. Therefore, it was found that the value of the backspin amount increases when the value of the speed ratio is large. In other words, it was found that the backspin amount increases as the swing through improves.

Next, No. 5 iron (5I) was examined in the same manner as the above wedge.
Regarding the measurement of the backspin rotation speed per minute, the head speed is set to 23.2 m / sec in the above-mentioned mechanical golfer manufactured by Miyamae Co., Ltd.

  Invention Examples 11 to 12 are examples of the present invention. Comparative Examples 13 to 17 are comparative examples for the present invention. Invention Examples 11 to 12 and Comparative Examples 13 to 17 are iron golf clubs 20 having the specifications shown in Table 3. The iron golf clubs 20 of Invention Examples 11 to 12 and Comparative Examples 13 to 17 are 5 irons (5I) having a loft angle of 27 °. The reference numerals in Table 3 are the same as those in Table 1.

  With reference to Table 3 and FIG. 10, the value of Speed ratio of this invention example 11 and this invention example 12 became 0.967 or more and 0.972 or less. On the other hand, the value of Speed ratio of Comparative Examples 13 to 17 was 0.852 or more and 0.904 or less. From this, it was found that the value of Speed ratio of Invention Example 11 and Invention Example 12 was larger than the value of Speed ratio of Comparative Examples 13-17.

  The D / H values of Invention Example 11 and Invention Example 12 were 1.5 or more and 1.7 or less. On the other hand, the D / H values of Comparative Examples 13 to 17 were 1.7 or more and 2.6 or less. In addition, although the value of D / H of Comparative Example 16 was 1.7, the value of Speed ratio was 0.903, which was smaller than Invention Example 1 and Invention Example 2.

  Referring to Table 3 and FIG. 11, the D / W values of Invention Example 11 and Invention Example 12 were 0.500 or more and 0.600 or less. On the other hand, the D / W values of Comparative Examples 13 to 17 were 0.600 or more and 0.862 or less. The D / W value of Comparative Example 17 was 0.600, but the speed ratio value was 0.904, which was smaller than Invention Example 1 and Invention Example 2.

  As described above, the speed ratio value for 5I is also increased when the D / H value is 1.7 or less and the D / W value is 0.6 or less, as in the case of the wedge described above. I understood.

  Moreover, with reference to Table 1 and FIG. 9, the value of the back spin amount of Invention Example 11 and Invention Example 12 was 5102 rpm or more and 5305 rpm or less. On the other hand, the value of the backspin amount of Comparative Examples 13 to 17 was 4874 rpm or more and 5004 rpm or less. From this, it was found that the backspin amount values of Invention Example 11 and Invention Example 12 were larger than those of Comparative Examples 13-17.

  Regarding Examples 1 to 2 and Comparative Examples 3 to 7, when the value of Speed ratio increases, the value of the backspin amount tends to increase. Therefore, it can be said that the backspin amount increases as the speed ratio also increases for the 5th iron (5I).

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied particularly advantageously to iron golf club heads and iron golf clubs.

  1 face part, 1a plane part, 1b curved part, 1m bottom end edge of face part, 2 back part, 3 sole part, 3f front end of sole part, 3m bottom part of sole part, 4 hosel part, 5 score line part 6 Leading edge portion, 7 Toe portion, 8 Heel portion, 9 Top edge portion, 10 Iron golf club head, 11 Chamfered portion, 12 Bottom of sole portion, 20 Iron golf club, 21 Shaft, 22 Grip, 23 Socket.

Claims (4)

A face part;
A back portion located behind the face portion;
A sole portion that connects the face portion and the back portion;
In a cross section perpendicular to the score line engraved in the face portion through the lowest point of the sole portion,
From the front end of the sole part to the lowest point of the sole part in the front-rear direction from the face part toward the back part with respect to the height from the lowest point of the sole part to the lowermost edge of the flat part of the face part And the ratio of the horizontal distance from the front end of the sole portion to the lowest point of the sole portion in the front-rear direction with respect to the width in the front-rear direction of the sole portion is 0 or less. Iron golf club head that is .6 or less.   The iron golf club head according to claim 1, wherein the sole portion includes a chamfered portion provided so as to shorten a length of a horizontal distance from a front end of the sole portion to a lowest point of the sole portion.   The iron golf club head according to claim 1 or 2, having a loft angle of 48 ° or more. A shaft,
A grip attached to one end of the shaft;
The iron golf club provided with the iron golf club head in any one of Claims 1-3 attached to the other end on the opposite side to the said grip of the said shaft.

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