JP2006198327A - Iron golf club head and iron golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a run of a hit golf ball by increasing a hitting angle while maintaining the amount of spin of the golf ball in an iron golf club head with a face surface for hitting the golf ball. <P>SOLUTION: A face member constituting the face surface 12b is provided with an approximately flat cut 20 along the face surface 12b to divide the face member into the hit front side and hit rear side from a top part 18 of a golf club head 10 toward a sole part 19. In a hollow golf club head 40 surrounded by an outer shell member, a member constituting a top part 42 of the iron golf club head is provided with an opening 44 passing through an internal space of the hollow iron golf club head in a heel-toe direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a solid iron golf club head having a face surface for hitting a golf ball, a hollow iron golf club head having a face surface for hitting a golf ball and surrounded by an outer shell member, and these irons The present invention relates to an iron golf club having a golf club head.

  Iron golf clubs, particularly short iron golf clubs, are required to have a function of accurately hitting a golf ball at a target position. For this reason, in order to accurately hit the golf ball at the target position, it is necessary to reduce the distance of the run where the golf ball rolls on the ground while maintaining the carry of the golf ball. Accordingly, there is a demand for increasing the launch angle of the golf ball and increasing the amount of spin given to the golf ball.

Generally, when the loft angle of the golf club head is increased, the launch angle of the golf ball is increased and the spin rate is increased. However, by increasing the loft angle, the hitting point position on the face surface of the golf ball varies, and the golf player It becomes difficult to handle golf clubs.
On the other hand, by increasing the launch angle while maintaining the spin amount of the golf ball, the run of the golf ball can be reduced and the golf ball can be hit accurately at the target position.

Patent Document 1 below discloses a golf club head in which a slit is provided in a protruding portion in the back direction on the sole side of an iron golf club, and the face surface is made low-rigidity by this slit to improve the resilience of the golf ball. Yes. Thereby, it is supposed that the flight distance of a golf ball can be increased.
Further, in Patent Document 2 below, a concave portion is formed on the back side corresponding to the face surface of the golf club head, and a thick and wide bulging portion is formed on the sole surface side. A golf club head in which a slit is provided in an inner peripheral portion on the face surface side is disclosed.

Registered Utility Model No. 3035480 JP-A-11-104283

In Patent Document 1, although the face surface has low rigidity and is easily bent by providing a slit, and the resilience can be improved, the iron golf club head has a larger loft angle than the wood-based golf club head. Therefore, even if the resilience is improved by reducing the rigidity of the face surface, the initial velocity of the golf ball is not necessarily increased.
Further, in Patent Document 1, since the rigidity of the portion on the sole side of the face surface, that is, the portion below the striking position is reduced, the face surface when the golf ball is launched is deformed in a direction in which the loft angle decreases. By this deformation, the launch angle is lowered and the spin amount is also lowered.
Also in Patent Document 2, since the rigidity of the portion on the sole side of the face surface, that is, the portion below the striking position is reduced, the launch angle is reduced due to deformation of the face surface when the golf ball is launched, and spin is further increased. It acts to reduce the amount.
For this reason, the golf club head disclosed in Patent Documents 1 and 2 does not function as an iron golf club that reduces the run of the golf ball by increasing the launch angle while maintaining the spin amount of the golf ball.

  Accordingly, the present invention provides an iron golf club head having a face surface for hitting a golf ball. The iron golf club head reduces the run of the golf ball by increasing the launch angle while maintaining the spin amount of the golf ball. And it aims at providing a golf club using this golf club head.

  In order to achieve the above object, the present invention provides an iron golf club head having a face surface for hitting a golf ball, wherein the face member constituting the face surface includes a top portion from a top portion of the iron golf club head. Provided is an iron golf club head having a substantially planar cut along the face surface so as to divide the face member into a striking front side and a striking rear side in a direction. To do.

In that case, it is preferable that the cut is provided from the top portion toward the sole portion so as to cross a perpendicular perpendicular to the face surface passing through the center of gravity of the iron golf club head.
Furthermore, it is preferable that the notch has a slit-like opening on the face surface and a toe side surface of the iron golf club head in addition to the top portion of the face member.

Preferably, the face member is a metal member, and the cut portion of the face member is filled with rubber or resin so as to be sandwiched between the metal members.
In addition, when the face member is cut along a plane perpendicular to the face surface, it is preferable that the cut has a cross-sectional shape in which the thickness of the cut decreases from the top portion toward the sole portion. .
Furthermore, it is preferable that the thickness of the face member on the front side between the notch and the face surface is 3 mm or less.

  The present invention further relates to a hollow iron golf club head surrounded by an outer shell member having a face surface for hitting a golf ball, wherein the member constituting the top portion of the iron golf club head includes a heel toe. Provided is an iron golf club head characterized in that an opening that penetrates an internal space of a hollow iron golf club head is provided in a direction.

At this time, the length of the opening in the heel / toe direction is preferably 40 mm or more.
Furthermore, the opening is preferably provided so as to cross a plane perpendicular to the face surface that passes through the center of the face in the heel / toe direction. Here, the center in the heel / toe direction refers to the center position of the score line having the maximum width among the score lines provided on the face surface.
Moreover, it is preferable that the opening is provided with a member that closes the internal space.

  Furthermore, the present invention provides an iron golf club having the iron golf club head and a golf club shaft attached to the iron golf club head.

In the present invention, the face member constituting the face surface is divided along the face surface so as to divide the face member into the striking front side and the striking rear side from the top part of the iron golf club head toward the sole part. Therefore, the face surface when the golf ball is hit is deformed to increase the loft angle. Thereby, the launch angle of the golf ball increases. In particular, by filling the notch with a member such as resin or rubber, the launch angle can be increased while maintaining the initial velocity and spin rate of the golf ball at the same level as before.
Further, in the hollow iron golf club head surrounded by the outer shell member, the member constituting the top portion of the iron golf club head penetrates the internal space of the hollow iron golf club head in the heel-toe direction. Since the opening is provided, the face surface when the golf ball is hit is deformed so that the loft angle becomes large. Thereby, the launch angle of the golf ball increases.

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

A golf club 10 shown in FIG. 1 is an iron golf club, and mainly includes a golf club head 12, a golf club shaft 14, and a grip 16.
One end of the golf club shaft 14 is attached to the hosel 12a of the golf club head 12, and a grip 16 is provided at the other end.
A known material is used for the golf club shaft 14, and a metal shaft such as steel, a carbon fiber shaft, or the like is used, and is not particularly limited.
The grip 16 is also made of a known material and is provided so as to cover the end of the golf club shaft 14.

The golf club head 12 is mainly composed of a metal face member such as steel or aluminum, and the face member constituting the face surface 12b is directed from the top portion 18 of the golf club head 12 toward the sole portion 19. A substantially planar cut 20 is provided along the face surface 12b. The substantially planar shape means a shape in which the cut width in the toe / heel direction of the cut 20 is extremely wide as compared to the thickness of the cut 20.
Here, the top portion 18 of the golf club head 12 is an upper portion of the face member that is connected above the face surface 12b that hits the golf ball when the golf club head 12 is installed at a normal address position. Say.

  FIG. 2A is a front view when the golf club head 12 is disposed such that the golf club shaft 14 is positioned on the vertical plane. FIG. 2B is a front view of the golf club shaft 14 on the vertical plane. FIG. 2C is a top view as viewed from above when positioned so as to be positioned, FIG. 2C is a side view when the golf club head 12 is viewed from the toe side, and FIG. 2D is a golf club. 3 is a perspective view of a head 12. FIG.

As shown in FIG. 2C, the golf club head 12 is provided with a substantially planar cut 20 so as to divide the face member into a striking front side and a striking rear side. This notch 20 extends from the top portion 18 to the lower portion of the face member toward the sole portion 19 so as to cross a perpendicular perpendicular to the face surface 12b passing through the center of gravity of the golf club head 12, and stops on the way. Yes.
Regarding the shape of the cut 20, the thickness of the cut when the face member is cut by a vertical surface perpendicular to the face surface 12 b is smaller than the width of the cut in the toe-heel direction, and from the top portion 18 to the sole portion 19. The thickness of the notch 20 is gradually narrowed as it goes. And the rubber | gum or resin is provided in the part of this notch 20 as a filler. It should be noted that the rubber or resin used as the filler has an elastic modulus (Young's modulus) of 1/10 or less that of the metal material that constitutes the face member. It is preferable from the point.

  The notch 20 is provided with a slit-like opening 20a (shaded portion in FIG. 1) in the top portion 18 in the heel / toe direction. Further, an opening 20b (a hatched portion in FIG. 1) of the cut 20 is provided in a slit shape at a heel side portion of the face surface 12b. Further, as shown in FIG. 2 (c), an opening 20c (a hatched portion in FIG. 2 (c)) of the notch 20 is also provided in a slit shape on the side surface 12c on the toe side of the face member.

  Further, the upper limit of the wall thickness on the front side of the face member constituting the face surface 12b between the notch 20 and the face surface 12b is preferably 3 mm, and the lower limit of the wall thickness is preferably 1 mm. By setting the thickness within the above range, the rigidity of the face surface 12b can be further reduced.

In such a golf club head 12, when hitting a golf ball, the top surface 18b of the face surface 12b is increased by the notch 20 and the elastic modulus of the rubber or resin filled in the notch 20 so that the loft angle becomes large. The side (upper side) portion is greatly deformed as compared with the sole portion 19 side (lower side) portion. For this reason, the launch angle of the golf ball increases as the loft angle increases.
On the other hand, the loft angle increases due to the deformation of the face surface 12b, but the increase in the spin amount caused by this increase is offset by the decrease in the spin amount caused by the relaxation of the local deformation of the face surface 12b, and the spin amount does not change. . In other words, the golf ball hitting force applied to the face surface 12b under the influence of rubber or resin provided in the cut 20 is dispersed, and local deformation of the face surface that occurs in the conventional golf club head is mitigated. As a result, the spin amount of the golf ball acts in the direction of decreasing.
In addition, the rigidity of the face surface 12b is reduced by the elastic modulus of the rubber or resin filled in the notch 20, and the coefficient of restitution when the golf ball is hit increases, but this increase is offset by the energy loss of the rubber or resin. Thus, the initial velocity of the launched golf ball does not change as compared with the conventional golf club head.

  Thus, the golf club head 10 can increase the launch angle while maintaining the initial velocity and spin rate immediately after the golf ball is launched at the same level as the conventional golf club head.

As such a golf club, a 4-iron golf club was used, and the effect was confirmed.
As a golf club head, the same face member as a conventional golf club head (golf club head A) using a metal (stainless steel) solid face member (thickness 4 mm) is used, and the thickness of the notch is 1 mm. As shown in FIGS. 2A to 2D, the notch 20 is provided from the top portion 18 toward the sole portion 19 up to 80% of the height of the face surface 12b, and an epoxy resin is applied to the notch 20 portion. Using the filled golf club head (golf club head B) according to the present invention and the golf club head (golf club head C) not filled with resin among the golf club heads according to the present invention, Initial velocity, launch angle, and spin rate were measured. The measurement used the method disclosed by Unexamined-Japanese-Patent No. 2003-57258.

Of the face members of the golf club heads B and C, the thickness on the front side of the impact was 2 mm, and the thickness on the rear side of the impact was 2 mm. The thickness of the resin in the golf club head B was 1 mm, similar to the cut thickness.
The results are shown in Table 1.

As is apparent from Table 1, the golf club head B of the present invention has the same initial speed and spin rate as the conventional golf club head A, but the launch angle is increased by 1 degree. Recognize. This increase in the launch angle of 1 degree corresponds to a decrease in the run of about 2 m (the distance from when the golf ball hits the ground until it stops), and the stability of the flight distance increases as the run decreases.
The launch angle of the golf ball by the golf club head C is further increased as compared with the golf club head B. However, since the golf club head C is not filled with the resin in the notch 20, the initial speed is lowered. For this reason, in order to maintain the initial speed in the same manner as in the prior art, it is preferable to provide rubber or resin as the filler in the cut 20.

The golf club head 12 described above has a configuration in which the slit-shaped opening of the cut 20 is provided in the top member 18, the heel side portion of the face surface 12b, and the side surface 12c on the toe side of the face member. As shown in FIGS. 3A to 3C, the opening of the notch 34 may be provided in a slit shape only in the top portion 32 of the face member of the golf club head 30.
3C is a vertical plane (AA ′ line in FIG. 3A) passing through the center of gravity G of the golf club head 30 and perpendicular to the face surface 36 shown in FIG. It is sectional drawing which shows the cross-sectional shape of the face member when cut | disconnected. The cut 34 has a constant cut width, is provided from the top portion 32 toward the sole portion 38, and extends from the center of gravity G toward the sole portion 38.
In the golf club head 30 as well as the golf club head 10, the launch angle increases.
Thus, the present invention provides a golf club head provided with a substantially planar cut along the face surface.

FIG. 4 is a view showing a golf club head 40 provided with a hollow inner space and an opening 44 penetrating in a hollow iron golf club head surrounded by an outer shell member having a face surface for hitting a golf ball. It is.
In the golf club head 40, a member constituting the top portion 42 of the iron golf club head is provided with an opening 44 penetrating a hollow internal space in a heel-toe direction in a slit shape.
The opening 44 is provided with a metal or resin member that closes the internal space of the hollow golf club head.
The length of the opening 44 in the heel / toe direction is preferably 40 mm or more. By setting it to 40 mm or more, the deformation of the face surface can be increased at the time of impact of the golf ball, and the launch angle can be increased.

  Even in such a golf club head 40, the rigidity of the top portion 42 is lower than that of the sole portion. Therefore, when the golf ball is hit, the face surface 46 is deformed so that the loft angle is increased, and the launch angle is increased. To do.

  As described above, the iron golf club head and the iron golf club of the present invention have been described in detail. However, the present invention is not limited to the above embodiment, and various improvements and modifications may be made without departing from the gist of the present invention. Of course it is good.

It is a perspective view showing one embodiment of an iron golf club of the present invention. (A) is a front view of the golf club head shown in FIG. 1, (b) is a top view of the golf club head shown in FIG. 1, and (c) is a side view of the golf club head shown in FIG. FIG. 2D is a perspective view of the golf club head shown in FIG. (A)-(c) is a figure which shows other embodiment of the golf club head of this invention. It is a figure which shows other embodiment of the golf club head of this invention.

Explanation of symbols

10, 30, 40 Golf club 12 Golf club head 12b, 36, 46 Face surface 14 Golf club shaft 16 Grip 18, 32, 42 Top portion 19, 38 Sole portion 20, 34 Cut 20a, 20b, 20c, 44 Opening portion

Claims (10)

An iron golf club head having a face surface for hitting a golf ball,
The face member constituting the face surface is arranged along the face surface so as to divide the face member into a front hitting side and a hitting rear side from the top part of the iron golf club head toward the sole part. An iron golf club head, wherein a substantially planar cut is provided.   2. The iron golf club head according to claim 1, wherein the cut is provided from the top portion toward the sole portion so as to cross a perpendicular perpendicular to the face surface passing through the center of gravity of the iron golf club head.   3. The iron golf club head according to claim 1, wherein the notch has a slit-like opening on the face surface and a toe side surface of the iron golf club head in addition to the top portion of the face member. The face member is a metal member,
The iron golf club head according to any one of claims 1 to 3, wherein the cut portion of the face member is filled with rubber or resin so as to be sandwiched between the metal members.   5. When the face member is cut along a plane perpendicular to the face surface, the cut has a cross-sectional shape in which the thickness of the cut decreases from the top portion toward the sole portion. The iron golf club head according to any one of the above.   The iron golf club head according to any one of claims 1 to 5, wherein a thickness of the face member on the front side of the hit between the notch and the face surface is 3 mm or less. A hollow iron golf club head surrounded by an outer shell member, comprising a face surface for hitting a golf ball,
An iron golf club head, wherein a member constituting a top portion of an iron golf club head is provided with an opening penetrating through an internal space of a hollow iron golf club head in a heel-toe direction.   The iron golf club head according to claim 7, wherein a length of the opening in a heel / toe direction is 40 mm or more. The iron golf club head according to claim 7 or 8, wherein a member that closes the internal space is provided in the opening. An iron golf club having the iron golf club head according to any one of claims 1 to 9 and a golf club shaft attached to the iron golf club head.

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