JP2005211560A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To send a golf ball flying to an accurate position and to stop the golf ball there by giving a back spin amount greater than a conventional amount to the golf ball, by a golf club head. <P>SOLUTION: When a golf club head 10 is set on a horizontal surface to obtain a loft angle and a lie angle which have been set, a first horizontal distance S between a lowest point B of a sole portion of the golf club head and a distal end point C of a face portion of the golf club head is 20 to 50 mm. Furthermore, a cross section Q is determined where a straight line L orthogonal with a shot surface 16 through a position on a shot surface of the face portion higher than the lowest point B by 14 mm crosses the horizontal surface, and when a second horizontal distance between this cross section Q and the distal end point C is defined as P, the first horizontal distance S is 0.9 to 1.2 times of the second horizontal distance P. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a golf club head for an iron golf club, and more particularly to a golf club head of a short iron such as an approach wedge or a sand wedge that adjusts a flight distance of a golf ball.

In short irons such as approach wedges and sand wedges, rather than earning a flight distance of the golf ball, an accurate shot is required in which the golf ball is accurately dropped and stopped near the cup on the green or in the vicinity of the cup.
In order to realize an accurate shot, it is necessary to reduce the rolling (run) of the golf ball after the golf ball has landed on the ground. This is because the run of the golf ball depends on the state of the ground on which it falls and the flight distance of the golf ball varies.

  For this reason, it is effective to increase the backspin amount of the golf ball in order to reduce the run of the golf ball, and the run of the golf ball can be reduced by giving a larger backspin amount to the golf ball.

Patent Document 1 below discloses a golf club in which the swing of the golf club head main body is improved by providing a guide surface inclined toward the toe side and the heel side at the sole portion of the golf club head.
Patent Document 2 below discloses a short iron that realizes a sharp and sharp shot by narrowing the sole width.

JP-A-8-266686 JP-A-8-257173

These golf club heads adjust the shape of the sole part and the like to cause the head body to bite into the ground and give a large back spin to the golf ball, or to swing the head body after biting into the ground To do.
On the other hand, professional golfers and advanced golfers want to give golf balls more backspin in approach wedges and sand wedges and drop the golf ball to the target position to stop it accurately. The golf club heads of Patent Documents 1 and 2 are not always satisfactory.

  Therefore, the present invention provides a golf ball with a higher backspin amount than that of the conventional golf club head such as a short iron such as an approach wedge or a sand wedge, thereby allowing the golf ball to fly to an accurate position. An object of the present invention is to provide a golf club head that can be stopped.

  In order to achieve the above object, the present invention provides a golf club head for an iron golf club, wherein when the golf club head is set on a horizontal plane so as to form a set loft angle and lie angle, the sole portion is A golf having a convex shape toward the lower side, and a horizontal distance between the lowest point of the sole part of the golf club head and the foremost part of the face part of the golf club head is 20 mm or more and 50 mm or less Provide club head.

  At that time, the loft angle is preferably 40 degrees or more.

  Furthermore, the present invention provides a golf club head for an iron golf club, wherein when the golf club head is set on a horizontal plane so as to form a set loft angle and lie angle, the sole portion is convex downward. And the striking surface of the face portion 14 mm above the lowest point, where S is the first horizontal distance between the lowest point of the sole portion of the golf club head and the forefront of the face portion of the golf club head. When the second horizontal distance between this intersection point and the forefront of the face portion is defined as P, a straight line perpendicular to the striking surface passing through the upper position intersects the horizontal plane, and the first horizontal distance The golf club head is characterized in that the horizontal distance S is not less than 0.9 times and not more than 1.2 times the second horizontal distance P.

At this time, the first horizontal distance S is preferably 20 mm or more and 50 mm or less.
The loft angle is preferably 40 degrees or more.

  In the present invention, the first horizontal distance S is set to 20 mm or more and 50 mm or less, and the first horizontal distance S is set to 0.9 times or more and 1.2 times or less of the second horizontal distance P. When the golf ball is hit, the rotational movement of the face portion that occurs when the lowest point of the sole surface comes into contact with the ground and bounces can be increased. For this reason, it is possible to increase the backspin amount of the golf ball hit by the gear effect due to the rotation of the face main body.

  Hereinafter, the golf club head of the present invention will be described in detail based on the preferred embodiments shown in the accompanying drawings.

FIG. 1A is a front view of a golf club head 10 which is an example of the golf club head of the present invention. The golf club head 10 is a wedge-type golf club head having a loft angle of 40 degrees or more.
The golf club head 10 includes a face main body portion 12 having a striking surface for hitting a golf ball, and a hosel portion 14 connected to the face main body portion 12 and into which a golf club shaft is inserted and coupled.

FIG. 1B is a cross-sectional view taken along the line AA ′ of the golf club head 10 shown in FIG.
When the golf club head 10 is set on a horizontal plane so as to form the set loft angle and lie angle, the golf club head 10 is positioned between the lowest point of the sole portion of the golf club head and the forefront of the face portion of the golf club head. The horizontal distance of 1 is 20 mm or more and 50 mm or less.
Specifically, when the golf club head 10 is set on the horizontal plane G so as to form the set loft angle and lie angle, the lowest point B of the face main body portion 12 of the golf club head 10 in contact with the horizontal plane G is set. The sole horizontal side of the face body 12 so that the first horizontal distance S between (the lowest point of the sole) and the most distal point C of the face body 12 of the golf club head 10 is 20 mm or more and 50 mm or less. The shape (the shape of the sole portion) is a convex shape.

Further, the golf club head 10 is set on the horizontal plane G so as to form the set loft angle and lie angle, and passes through the position on the striking surface 16 of the face main body 12 14 mm above the lowest point B. When a straight line L perpendicular to the striking surface 16 intersects the horizontal plane G, an intersection point Q is defined, and when the second horizontal distance between the intersection point Q and the most distal point C of the face body 12 is P, the first Is formed so that the sole side shape (the shape of the sole portion) of the face main body portion 12 is convex so that the horizontal distance S is 0.9 times to 1.2 times the second horizontal distance P. .
Here, the position on the striking surface 16 14 mm above the lowest point B is the average position of the hit center when the golf ball is hit.

  Note that setting (installation) on a horizontal plane so as to form the set loft angle and lie angle specifically means installation at a normal address position, and more specifically, it is set. This is equivalent to installing a lie angle so that the center axis of the insertion hole of the neck portion into which the golf club shaft of the golf club head is inserted is parallel to the leading edge of the golf club. Here, the installation is performed so that the set lie angle is formed, and the clearance between the round surface of the sole portion forming the bottom surface of the golf club head and the reference surface is substantially equal on the toe side and the heel side. That means. When the round surface of the sole portion is unclear, the score line formed on the face surface may be installed so that the reference surface is parallel. Further, in a golf club manufactured by inserting a golf club shaft into a golf club head, it is determined whether or not the round surface of the sole portion is indistinct and the score line is not linear, for example, parallel to the reference surface Is difficult, the lie angle is set as lie angle (degree) = (98−club length (inch)). For example, if the club length is 35 inches, the lie angle is 98−35 = 63 degrees. Here, the club length is measured by a traditional standard measuring method established by the Japan Golf Equipment Association. An example of the measuring device is Club Major II manufactured by Kamoshita Seikosho Co., Ltd.

Moreover, the loft angle in a golf club provided with the said golf club head can be obtained by measuring as follows.
The loft angle is an angle formed by the shaft axis of the golf club shaft inserted into the neck portion of the golf club head and the face surface, and is measured by a loft angle measuring device 50 as shown in FIG.
FIG. 3 shows an example in which an iron golf club having the above-described golf club head is attached to a loft angle measuring device 50, and FIG. 3 is an enlarged view of the periphery of the golf club head 10 in FIG.

  In the measurement of the loft angle, the mounting angle is adjusted by the lie angle adjusting unit 53 so that the golf club is installed at the lie angle described above with respect to the reference plane 52 in a state where the golf club is mounted on the loft angle measuring device 50. Next, the golf club attached to the loft angle measuring device 50 is arranged so that the sole portion 19 is in contact with the reference surface 52 and the striking surface 16 is in close contact with the front end portion 56a of the face angle adjuster 56, that is, The golf club is fixed by the chuck portion 58 so that the face angle becomes 0 °.

Here, the installation according to the above-mentioned lie angle means that the score line 55 is installed so as to be parallel to the tip end portion 56 a of the face angle adjustment jig 56. Further, when it is difficult to discriminate by the score line, for example, the score line is not a straight line, the sole portion 19 is convex between the toe side (T) and the heel side (H) of the sole portion 19 as shown in FIG. When it is round, it means that the gap formed between the reference surface 52 and the sole portion 19 is installed so that it is substantially equal on the toe side and the heel side.
Further, when the convex portion of the sole portion 19 is unclear and the score line is not linear and the parallelism with the reference plane 52 cannot be determined, as described above, the lie angle is 100-golf club length. It is set as the value of (inch) and installed according to the lie angle. The golf club length is the length from the contact point between the sole surface of the golf club head and the back of the neck portion to the grip end (not including the roundness of the cap).

Thereafter, as shown in FIG. 5, the loft angle θ is measured by using a protractor 60 that stands vertically to the reference surface 52 of the striking surface 16 of the golf club head 10. When the striking surface 16 is flat, the loft angle θ is obtained by the above measurement, but when the striking surface 16 is rounded convexly, as shown in FIG. It is measured with the measurement surface touching.
The loft angle θ can be measured by using a golf club as described above, or by inserting a shaft pin into a single golf club head. The numerical value of the loft angle θ obtained by measuring the golf club head alone is substantially the same as the loft angle θ obtained by measuring with the above-described golf club.

  Such a measuring device may be a known one that is commercially available, for example, Takatsuo ball head measuring table (manufactured by Shoho Co., Ltd.), golf club angle measuring device (manufactured by Golf Garage), and golf club gauge. (Manufactured by Golfsmith) and the like.

  The face body portion 12 and the hosel portion 14 of the golf club head 10 are made of a known metal material such as a stainless alloy or an aluminum alloy, but the material is not particularly limited in the golf club head of the present invention. Further, the golf club head of the present invention is not limited to wedge type golf club heads such as pitching wedges, approach wedges and sand wedges, and middle numbers such as No. 5 and No. 7 irons having loft angles of 25 degrees, 33 degrees, etc. It may be an iron or long iron golf club head. However, the present invention can be suitably applied to a golf club head having a function of carrying and stopping a golf ball such as a sand wedge near the cup, and the loft angle is preferably 40 degrees or more. A golf club having a loft angle of 40 degrees or more is a golf club in which it is desired to accurately stop the golf ball by dropping the golf ball to a target position by increasing the backspin amount. In addition, although an upper limit is not provided in a loft angle, as a practical golf club, a loft angle is 65 degrees or less.

In such a golf club head 10, when the golfer swings down toward the ground to hit the golf ball, the amount of back spin given to the golf ball increases as shown in the examples described later, and the golf ball is hit and ground. The run of the golf ball after it has dropped is reduced.
FIG. 7A is a view for explaining the operation of the face main body 12 of the golf club head 10 when the golf ball is hit.

  When a professional golfer or an advanced player hits a golf ball, the lowest point B of the golf club head 12 comes into contact with the ground and bounces. At that time, the golf club head 12 moves from the left to the right in FIG. 7A in order to launch the golf ball in the striking direction. For this reason, the face main body 12 rotates in the clockwise direction in FIG. 7A around the lowest point B in contact with the ground. This rotational motion is absorbed by the deflection of the golf club shaft or by the golfer's grip. However, in the golf ball 20, the striking surface 16 changes from a broken line to a solid line by this rotational movement, so that the golf ball that is launched is spun in the counterclockwise direction (arrow direction) in FIG. Occurs. Since the spin direction is a direction that increases the amount of backspin generated by the loft angle, the run of the golf ball falling on the ground decreases.

Since the golf club head 10 functions as described above when the golf ball is hit, by increasing the distance between the lowest point B and the hit point of the golf ball (the center point on the hitting surface with which the golf ball contacts). Even when the golf club head rotates at the same rotation angle θ (see FIGS. 7A and 7B), the amount of back spin applied to the golf ball increases. FIG. 7B shows a case where the distance between the lowest point B of the face body 22 and the hitting point of the golf ball is reduced.
In the present invention, when the straight line from the lowest point B to the hitting point of the golf ball is substantially orthogonal to the hitting surface, the amount of backspin applied to the golf ball is effectively increased.
In the present invention, such a state can be achieved by setting the first horizontal distance S to 20 mm or more and 50 mm or less. Further, this can be achieved by configuring the sole side shape of the face body portion 12 to be convex so that the first horizontal distance S is 0.9 times or more and 1.2 times or less of the second horizontal distance P. it can.

  As described above, the golf club head has a first horizontal distance S of 20 mm or more and 50 mm or less, and a first horizontal distance S of 0.9 times or more and 1.2 times or less of the second horizontal distance P. The form of the cross-sectional shape is not limited to the form in which the bounce angle (angle formed by the striking surface and the sole surface) is made constant and the position of the lowest point B is adjusted as shown in FIG. As shown in FIG. 4, the golf club head 30 may have a configuration in which the protruding portion 32 is provided on a part of the sole surface.

  In order to examine the effect of the golf club head of the present invention, a golf club shaft is coupled to a golf club head having various ratios of the first horizontal distance S and the first horizontal distance S to the second horizontal distance P. A golf club was produced, and the initial velocity (m / sec) and the launch angle (degree) back spin rate (RPM) immediately after launch of the launched golf ball were measured. The form of the produced golf club head has the shape shown in FIG.

The golf club head is a 5-iron golf club head with a loft angle of 26 degrees, a 7-iron golf club head with a loft angle of 33 degrees, a 9-iron golf club head with a loft angle of 41 degrees, and a loft angle A golf club head having a pitching edge of 46 degrees.
The backspin amount of a golf ball immediately after launch is measured by shooting a golf ball with three marks on the surface at a certain time interval with a camera to measure the initial speed, launch angle and backspin amount immediately after launch of the golf ball. did. Three golfers hit the golf ball 5 times each to obtain a total of 15 measurement results of the golf ball, and obtain an average value of the measurement results.

  In Tables 1 to 7 below, the average values were indexed based on the average values of the initial speed, launch angle, and backspin amount when the first horizontal distance S = 5 mm (100). In either case, the higher the value, the higher the initial velocity, launch angle, and backspin amount.

As is clear from Tables 1 to 4, the first horizontal distance S is 20 mm or more and 50 mm or less,
In a golf club head in which the first horizontal distance S is 0.9 times or more and 1.2 times or less of the second horizontal distance P, the backspin amount increases rapidly without a significant change in the initial speed. Further, as apparent from Tables 5 to 7, when the first horizontal distance S / the second horizontal distance P is 0.9 or more and 1.2 or less, the backspin amount is increased by 2% or more. In particular, by adjusting the golf swing, the golf ball is stopped in the vicinity of the cup, and the loft angle such as a wedge system (pitching wedge, approach wedge, sand wedge, pitching sand, etc.) or a 9 iron is more than 40 degrees. It can be suitably used for a golf club head.

  The golf club head of the present invention has been described in detail above. However, the present invention is not limited to the above embodiment, and various improvements and modifications may be made without departing from the spirit of the present invention. is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a wedge-type golf club head that is an example of a golf club head according to the present invention, and FIG. 1B is a cross-sectional view of the golf club head shown in FIG. It is a figure explaining the loft angle measuring device which measures the loft angle in the golf club head of this invention. It is explanatory drawing explaining the principal part of the measuring device shown in FIG. It is another explanatory drawing explaining the method of measuring a loft angle with the measuring device shown in FIG. It is another explanatory drawing explaining the method of measuring a loft angle with the measuring device shown in FIG. It is another explanatory drawing explaining the method of measuring a loft angle with the measuring device shown in FIG. (A), (b) is a figure explaining the effect | action of the face main-body part of a golf club head at the time of a golf ball hit. It is sectional drawing of the other example of the golf club head of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Golf club head 12, 22 Face main-body part 14 Hosel part 16 Impact surface 20 Golf ball 50 Loft angle measuring device 60 Protractor

Claims (5)

A golf club head for an iron golf club,
When the golf club head is set on a horizontal plane so as to form a set loft angle and lie angle, the sole portion is convex downward, and the lowest point of the golf club head sole portion and the golf club A golf club head characterized in that a horizontal distance from the forefront of the face portion of the head is 20 mm or more and 50 mm or less.   The golf club head according to claim 1, wherein the loft angle is 40 degrees or more. A golf club head for an iron golf club,
When the golf club head is set on a horizontal plane so as to form a set loft angle and lie angle, the sole portion is convex downward, and the lowest point of the golf club head sole portion and the golf club A straight line perpendicular to the striking surface passing through a position on the striking surface of the face portion 14 mm above the lowest point is defined as a horizontal plane, where S is a first horizontal distance between the head portion and the tip of the face portion of the head. When the intersecting point is determined, and the second horizontal distance between this intersecting point and the forefront of the face portion is P,
The golf club head according to claim 1, wherein the first horizontal distance S is not less than 0.9 times and not more than 1.2 times the second horizontal distance P.   The golf club head according to claim 3, wherein the first horizontal distance S is 20 mm or more and 50 mm or less.   The golf club head according to claim 3 or 4, wherein the loft angle is 40 degrees or more.

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