JP2007061369A - Golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club by which the position of a gravitational center can be made deeper to make the gravitational center low and the directional stability and the flying distance of hit balls can be improved. <P>SOLUTION: The golf club has a head 10 constituted by projecting a top portion 24, a sole portion 16, a toe portion 18, and a heel portion 20 to the back side of the back face 12b of a face portion 12 along the peripheral end portion of the face portion 12 forming the ball hitting face of golf balls, and forming a cavity 26A open to the back side within the top portion, the sole portion, the toe portion, and the heel portion. A back portion 28 is formed having an inside face 30 facing the back face 12b of the face portion 12 by extending from the sole portion 16 to the back side, a top portion side recessed portion 32 recessed to the sole portion 16 side is recessedly formed in a center portion in a toe-heel direction of the back portion 28, and the inner face of the top portion side recessed portion 32 is formed by the inclined face 32a which keeps the back side arranged above the face side relative to the reference horizontal face P. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a golf club having a head that is set to a prescribed lie angle and loft angle with respect to a reference horizontal plane and is fixed to one end of a shaft.

In general, it is required for golf club heads to improve the directional stability and the flight distance of a hit golf ball.
For this reason, a golf club head that improves the resilience by making the center part of the sole part of the iron head thinner than the toe side part and the heel side part, making the face part easy to bend while maintaining the rigidity required for the sole part. Has been developed (see, for example, Patent Document 1).

In addition, an undercut portion recessed toward the outer periphery of the head is recessed on the inner wall portion of the head body portion surrounding the cavity recessed on the face side, or recessed toward the sole portion, the toe portion or the top portion, or the entire inner wall portion. The undercut part is formed as a countersink-like groove provided on the face surface side of the inner wall part of the head main body part, so that the weight of the part is rearward of the inner wall part of the cavity. Iron-type golf club heads that have been shifted to have been developed (see, for example, Patent Document 2).
JP2002-191729 JP 2003-135632 A

  However, a golf club head with a thin structure at the center of the sole portion of the iron head distributes the weight to the toe side and the heel side, thereby increasing the moment of inertia in the toe and heel directions along both directions of the head toe and heel. However, even if it is possible to prevent the head from moving when the hit point is displaced along the toe-heel direction, it is not possible to increase the center of gravity, that is, to increase the position of the center of gravity from the face surface on which the golf ball is hit.

  An iron-type golf club head having an undercut portion recessed toward the outer periphery of the head on the inner wall portion of the head main body portion surrounding the cavity is formed by a groove having a substantially rectangular cross-sectional shape along the face surface. Thus, when the undercut portion is provided on the sole portion side, the center of gravity cannot be moved rearward sufficiently even if the center of gravity can be lowered.

  The present invention has been made based on such circumstances, and a golf club capable of lowering the center of gravity while deepening the position of the center of gravity and improving the direction stability of the hit ball and improving the flight distance. The purpose is to provide.

  The golf club of the present invention that achieves the above object has a head that is set to a prescribed lie angle and loft angle with respect to a reference horizontal plane and is fixed to one end of a shaft. The top part, the sole part, the toe part, and the heel part protrude from the back part of the face part to the back side along the peripheral edge part of the face part formed on the front surface, and the top part, the sole part, the toe part, and the heel part. A golf club having a cavity opened on the back side on the inside of the part, extending from the sole part to the back side to form a back part having an inner surface facing the back of the face part, At the center of the back portion in the toe / heel direction, a concave portion on the top portion side is provided in a state of being depressed toward the sole portion side, and the inner surface of the concave portion on the top portion side is flush with the reference horizontal plane on the back side. Characterized by being formed with inclined surface which is arranged above the over scan portion.

  Further, the inner surface of the back portion is disposed on the toe side and the heel side of the top portion side recess, and an inclined surface in which the back side is disposed above the face side with respect to the reference horizontal plane. It is preferable that these toe side and heel side inclined surfaces form a larger inclination angle with respect to the reference horizontal plane than the inclined surface of the top portion side recess.

  Further, the back portion is arranged such that the back side is disposed below the face side with respect to the reference horizontal plane along the back side edge portions of the toe side portion and the heel side portion adjacent to the top side recess. It is preferable to form a chamfered portion in a direction intersecting with the inclined surface of the top-side concave portion by the inclined surface.

  Further, the inner side surface of the back portion is provided with a concave portion on the face side so as to be recessed toward the back side at the center portion in the toe / heel direction, and the inclined surface forming the inner surface of the concave portion on the face side is It is preferable to continue to the inclined surface of the top-side concave portion.

  According to the golf club of the present invention, by forming a concave portion on the top portion side in the center portion in the toe / heel direction of the back portion, a large amount of weight can be distributed to the toe side and heel side of the back portion, and the hitting position is shifted. The head can be prevented from shaking, and the recess is formed by an inclined surface with the back side positioned above the face side with respect to the reference horizontal surface on which the ball is placed. The center of gravity can be lowered while the position is deepened, and the direction stability of the hit ball and the flight distance can be increased.

  When the inner side surface of the back portion has toe side and heel side inclined surfaces that form a larger inclination angle with respect to the reference horizontal plane than the inclined surface of the top side concave portion, the weight of the back portion is reduced. The head can be distributed to the side and the heel side, and the head blur due to the deviation of the hitting point can be efficiently prevented.

  Furthermore, by forming a chamfered portion in a direction intersecting the inclined surface of the top portion side recess along the back side edge of the toe side portion and the heel side portion adjacent to the top portion side recess, In particular, the outer edge of the recess on the top portion side becomes clear, the ball can be easily caught at the center portion of the face portion, and miss shots can be reduced and directional stability can be improved.

  In addition, when the concave part on the face part side is recessed in the center on the inner side of the back part in the toe / heel direction, the weight of the back part at the center part in the toe / heel direction is further increased on the back side. Can be arranged.

1 to 6 show a golf club according to a preferred embodiment of the present invention.
The golf club according to the present embodiment has a lie angle α (FIG. 1) and a loft angle β (FIG. 3) defined with respect to a reference horizontal plane P at the tip of a shaft (not shown) formed in a hollow structure with, for example, fiber reinforced resin or metal. It is formed as an iron head club to which the head 10 is fixed. Here, the lie angle α is a mounting angle of the shaft axis S with respect to a sole portion or a reference horizontal plane P, which will be described later, and a loft angle β is an angle between a front surface of the face portion, which will be described later, and a vertical plane R perpendicular to the reference horizontal plane P. This is the angle formed between them. In addition to the so-called iron head, the head 10 may be other than a wood club such as a pitching wedge, a sand wedge, or a putter.

  As shown in FIG. 1, in the head 10 of the present embodiment, a face portion 12 that forms a hitting surface of a golf ball on the front surface is formed of a highly elastic and high strength plate-like metal material, and the plate-like face portion 12 is formed. Is fixed to a metal head main body 14. A large number of score lines 12a are formed on the front surface of the face portion 12 by a suitable means such as a shallow groove in a substantially horizontal direction along a hitting ball region suitable as a hitting surface of a golf ball. Further, the head main body 14 has a sole portion 16 whose central portion bulges slightly downward, a toe portion 18 that forms a curved tip portion, and a shaft fastening portion 22 that protrude along the axis S of the shaft. It has a heel portion 20 and a top portion 24 that is inclined upward from the heel portion 20 toward the toe portion 18, and has an opening penetrating from the front side opening portion 26 to the back side as shown in FIGS. 3 to 6. It has the frame-like structure formed in. The face portion 12 is fixed in a state in which the peripheral portion is supported by the step portion 14 a surrounding the opening 26 on the front surface side of the head body 14 so as to be flush with the front surface of the head body 14. The face portion 12 is preferably fixed integrally to the head main body 14 by welding, caulking, or the like at a portion on the outer peripheral side of the portion where the score line 12a is formed.

  As shown in FIGS. 2 to 6, the head 10 having such a plate-shaped face portion 12 and a frame-structured head main body 14 has a sole portion 16 and a toe portion along the peripheral edge portion of the face portion 12. 18, the heel portion 20, and the top portion 24 protrude from the back surface 12 b of the face portion 12 to the back side, and a cavity 26 A that is closed by the face portion 12 and opens to the back side is formed or defined.

  Such a head 10 is made of a metal such as stainless steel, pure titanium, titanium alloy, aluminum alloy, maraging steel, etc., or a part or the whole of the head 10 if it has the same strength as that of the metal. It is also possible to form with resin, fiber reinforced metal, etc. Therefore, the metal head of the present invention includes those formed with such fiber reinforced resin or fiber reinforced metal. Further, for example, each portion forming the head 10 such as the head main body 14 can be formed by combining a plurality of materials. In any case, the face portion 12 is preferably made of a material having a higher hardness or a higher rigidity than other portions, and a material having a higher strength, but a material having a low elasticity and a low specific gravity is used. It is also possible.

  In particular, as clearly shown in FIGS. 3 and 4, the head 10 of this embodiment has a back portion 28 extending from the sole portion 16 of the head body 14 to the back side and the top portion 24 side. An inner side surface 30 that faces the back surface 12b of the face portion 12 is formed. The back portion 28 is formed in a continuous state from the sole portion 16, and the head 10 is disposed on the reference horizontal plane P so that the front surface of the face portion 12 forms a prescribed loft angle β with respect to the vertical plane R. In addition, the golfer holding the golf club may extend the back side from the top part 24 to a position where the back side edge of the back part 28 can be seen.

  Further, in the direction of the top portion 24, as shown in FIG. 2, for example, it extends at substantially the same height in the range of the hitting surface on which the score line 12a is formed, and the height h1 on the toe portion 18 side and the heel portion A back surface 29 (FIG. 3) having a height 20 substantially equal to the height h2 on the 20 side is formed. The back portion 28 extended from the sole portion 16 smoothly transitions to the head main body 14 on the toe portion 18 side and the heel portion 20 side, and the toe portion 18, the heel portion 20, and the top portion 24 of the head main body 14. The back side opening 26b of the cavity 26A is formed together with each back side inner edge. By forming the back side opening 26b smaller than the opening 26 on the front side, the center of gravity position can be arranged on the back side.

  As shown in FIGS. 2 and 3, the back portion 28 is formed with a top portion-side recess 32 that is recessed toward the sole portion 16 at the center in the toe-heel direction. The top portion side recess 32 is disposed in the center plane Q passing through the center line in the toe / heel direction of the area where the hitting surface, that is, the score line 12a is formed, and opens in the toe / heel direction in the cavity 26A side. The dimension g is, for example, about 1/2 to 1/3 of the dimension of the back side opening 26b of the head 10 in the toe / heel direction or substantially equal to the diameter of the golf ball, and distributes the weight to the toe side and the heel side. Yes.

  The top portion side recess 32 is a position where the back side back surface 29 forms the lowest height h3 from the reference horizontal plane P at the position intersecting the central surface Q, and the heights h1 and h2 higher than this are formed. The weight of the back portion 28 is disposed on the portion 18 side and the heel portion 20 side. As a result, the moment of inertia in the toe / heel direction can be increased, and even when the hitting point is deviated in the toe / heel direction, the head 10 is prevented from blurring and the direction stability of the hitting ball is improved. Can do.

  Further, the top portion side concave portion 32 has an inner surface formed by an inclined surface 32a in which the back surface 29 side, that is, the back side is disposed above the face portion 12 side, that is, at a high position from the reference horizontal plane P. That is, as shown in detail in FIG. 3, the inclined surface 32a forming the top portion side recess 32 has a tangent line T1 passing through the face portion 12 side edge portion and the back side edge portion in the center surface Q. An angle θ1 smaller than 90 ° with respect to the front surface of 12 is formed.

  As described above, the top-side concave portion 32 is formed by the inclined surface 32a in which the face side is closer to the reference horizontal plane P than the back side, so that the center of gravity position of the back portion 28 approaches the reference horizontal plane P side and the face portion It is arranged on the back side further away from the twelve striking surfaces. As a result, the center of gravity depth of the head 10 is deepened, the moment of inertia of the head 10 in the toe-heel direction can be increased, and blurring of the head 10 at the time of hitting is suppressed, thereby improving the direction stability of the hit ball. To do.

  The inner side surface 30 of the back portion 28 on the toe side and the heel side of the top portion side concave portion 32 forms a larger inclination angle with respect to the reference horizontal plane P than the inclined surface 32 a of the top portion side concave portion 32. Side and heel side inclined surfaces 30a are formed. Therefore, the tangent line T2 formed by the upper edge portion of the toe side and heel side inclined surface 30a in the plane perpendicular to the reference horizontal plane P is smaller than the angle θ1 described above with respect to the front surface of the face portion 12. θ2 is formed. As described above, even in a region other than the top portion side recess 32 of the back portion 28, the tangent line T2 of the inner side surface 30 is inclined by θ2 which is an angle smaller than 90 ° with respect to the front surface of the face portion 12. Also on the toe side and the heel side of the recess 32, the weight is arranged on the back side. As a result, the back portion 28 can reduce the center of gravity by the top-side concave portion 32 and increase the moment of inertia of the head 10 while increasing the depth of the center of gravity by the inclined arrangement of the inner side surface 30. Therefore, the head 10 can distribute the weight of the back portion 28 to the toe side and the heel side, and can effectively prevent the head 10 from being shaken due to a hit point shift.

  As shown in FIGS. 3, 5, and 6, the inner side surface 30 is further provided with a face side recess 34 in the center in the toe / heel direction so as to be recessed toward the back side. The inclined surface 34 a that forms the inner surface of the side recess is continuous with the inclined surface 32 a of the top-side recess 32. The inclined surface 34a forms an angle smaller than the angle θ1 and larger than the angle θ2 with respect to the front surface of the face portion 12, and further reduces the weight of the back portion 28 at the center portion in the toe-heel direction. Can be arranged.

  In this way, the back portion 28 in which various inclined surfaces 30a, 32a, and 34a are formed, particularly along the back side edges of the toe side portion and the heel side portion adjacent to the top portion side recess 32, A chamfered portion 36 in a direction intersecting with each of the inclined surfaces 30a and 32a is formed by an inclined surface in which the back side is disposed below the face portion with respect to the reference horizontal plane P. Thereby, especially the outer edge of the back side of the top part side recess 32 becomes clear. In particular, when the top-side concave portion 32 is arranged on the substantially central surface Q (FIG. 2) to form a circular arc that is substantially the same shape as the diameter of the golf ball and a concentric arc, The side concave portion 32 serves as a standard, and it becomes easy to catch the ball at the central portion of the face portion 12, thereby reducing miss shots and improving directional stability.

  In the above-described embodiment, the inclined surface 32a that forms the top-side concave portion 32 and the inclined surface 34a that forms the face-side concave portion 34 are formed as shown in FIGS. As shown in FIG. 3, it is formed of a spherical curved surface that is curved in the face-back direction along both the face and the back as shown in FIG. For this reason, the recessed amount or notch amount of the concave portions 32 and 34 can be increased, and the weight can be largely distributed in the toe-heel direction and the back direction.

  The present invention is not limited to the above-described embodiments and modifications, and various modifications or changes can be made. For example, the head main body 14 may be entirely formed of the same member, or a weight member (not shown) is disposed at a required portion corresponding to various conditions such as the size, shape, center of gravity position, moment of inertia, and the like. It is also possible to finely distribute the weight, such as adjusting the distance. Further, the top-side recess 32 is separated from the position intersecting the center plane Q, and is formed on the toe side or the heel side, or the adjacent toe-side height h1 and heel-side height h2 are different, so You may adjust the position of the center of gravity, such as by number.

1 is an overall view of a head of a golf club according to a preferred embodiment of the present invention as viewed from a face portion. The front view of the head of FIG. FIG. 3 is an end view of a cross section taken along a line III-III passing through the center plane of the head of FIG. 1. The end elevation of the cross section which follows the IV-IV line of FIG. Sectional drawing which follows the VV line of FIG. The front view of the state which removed the face part from the head of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Head, 12 ... Face part, 12b ... Back surface, 14 ... Head main body, 16 ... Sole part, 18 ... Top part, 20 ... Heel part, 24 ... Top part, 26A ... Cavity, 28 ... Back part, 32 ... Top part side recessed part, 32a ... inclined surface, P ... reference | standard horizontal surface.

Claims (4)

It has a head that is set to a predetermined lie angle and loft angle with respect to a reference horizontal plane and is fixed to one end of the shaft, and this head extends along the peripheral edge portion of the face portion that forms the hitting surface of the golf ball on the front surface. The top, the sole, the toe, and the heel protrude from the back of the face to the back side, and the cavity opens to the back side inside the top, the sole, the toe, and the heel. A golf club formed of
A back portion having an inner surface facing the back surface of the face portion is formed extending from the sole portion to the back side, and the top is recessed in the sole portion side at the center portion in the toe-heel direction of the back portion. A golf club comprising a concave portion on the side, and an inner surface of the concave portion on the top portion formed by an inclined surface with a back side disposed above the face side with respect to the reference horizontal plane.   The inner surface of the back portion is disposed on the toe side and the heel side of the top portion side recess, and has an inclined surface with the back side disposed above the face side with respect to the reference horizontal plane. 2. The golf club according to claim 1, wherein the toe side and heel side inclined surfaces form a larger inclination angle with respect to the reference horizontal plane than the inclined surface of the top portion side recess. .   The back portion has an inclination in which the back side is disposed below the face side with respect to the reference horizontal plane along the back side edge portions of the toe side portion and the heel side portion adjacent to the top side recess. 3. The golf club according to claim 1, wherein a chamfered portion in a direction intersecting with the inclined surface of the top-side concave portion is formed by the shaped surface.   A concave portion on the face side is formed in the center of the back side in the toe / heel direction so as to be recessed toward the back side, and the inclined surface forming the inner surface of the concave on the face side is the top side. The golf club according to claim 1, wherein the golf club is connected to an inclined surface of the recess.

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