JP5698168B2 - Iron type golf club and iron type golf club head - Google Patents

Description

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

  Conventionally, as a head of an iron-type golf club, a head having a cavity structure on the back side of a face portion on which a ball is hit is known. In such a head structure, the weight is distributed around the face portion and the weight on the sole side can be increased, so that the moment of inertia can be increased while the center of gravity is lowered, and the hitting ball direction is stable. Can be achieved.

  The head of the cavity structure described above can increase the resilience and increase the moment of inertia by thinning the face (face member), but the strength decreases if the face is made too thin. At the same time, the center of the face portion is easily bent at the time of hitting, and the directionality is lowered or the hit feeling is deteriorated.

  Therefore, as disclosed in Patent Document 1, it is known to form a rib on the bottom surface of the cavity (the back surface of the face portion). The rib disclosed in Patent Document 1 is formed with a uniform width and height on the back surface of the face portion so that the center position of the face portion is difficult to bend. Patent Document 2 discloses an iron type golf club in which a rib different from Patent Document 1 is formed on the back surface of the face portion. Specifically, a plurality of ribs extending in the top / sole direction are formed at intervals in the toe / heel direction, and the volume ratio increases as each rib shape shifts from the toe side to the heel side. By forming it so that it gradually decreases or the height gradually decreases, the rigidity of the face portion is lowered as it moves from the toe side to the heel side.

JP 2001-87430 A Actual Kaihei 7-3777

  In the head provided with the rib as disclosed in the above-mentioned Patent Document 1, the deflection of the entire face portion is suppressed, and the face structure is difficult to repel. In particular, the face portion of an iron-type golf club has a shape with a long toe side and a short heel side when viewed from the top / sole direction. When the ribs are formed, the heel side deflection of the face portion tends to be suppressed, and this increases the repulsion difference between the hit ball at the center position and the hit ball on the heel side, so that when the hit point fluctuates, The distance difference becomes large (the flight distance is not stable).

  Further, in the head having a rib as disclosed in Patent Document 2 described above, when the hitting point is deviated in the toe-heel direction, the hitting point at the position where the rib is formed and the hitting point at other positions. The difference in repulsion occurs between the two and the flight distance difference due to the hitting point is large, and the flight distance is not stable.

  The present invention has been made on the basis of the above-described problems, and the face portion is lighter and stronger, and has improved resilience, so that even if hitting occurs in the toe-heel direction, there is little variation in flight distance. An object of the present invention is to provide an iron type golf club having a head structure.

In order to achieve the above object, the present invention provides a face portion having a face surface on which a hit ball is formed, and supports the face portion at a predetermined loft angle, and includes a top portion, a sole portion, a toe portion, and a heel. In an iron type golf club having a head main body having a cavity formed by a portion and a shaft fixed to the head main body, the maximum thick portion on the toe side from the center position of the effective hitting area of the face portion And a rib extending from the maximum thick portion toward the heel side is formed on the back surface of the face portion, and the cross-sectional area of the rib decreases from the maximum thick portion toward the heel side. It is, from the thickest portion, further toe side upward, and toward the toe side downward to form a rib extending, face portion is divided into three regions by the rib, Thickness of the thick> toe side region of the region of the over thickness of Le side area> top side, characterized in that it is formed to be.

Further, the present invention provides a face portion having a face surface on which a hit ball is formed, a cavity formed by a top portion, a sole portion, a toe portion, and a heel portion while supporting the face portion at a predetermined loft angle. In the iron-type golf club head provided, the maximum thick portion is formed on the toe side of the center of the effective hitting area of the face portion, and the back surface of the face portion is directed toward the heel side from the maximum thick portion. The rib has a cross-sectional area that decreases from the maximum thickness portion toward the heel side , and further from the maximum thickness portion toward the upper side of the toe side and the lower side of the toe side. The face portion divided into three regions by the ribs has the thickness of the sole side region> the thickness of the top side region> the thickness of the toe side region. In Made is characterized in that is.

  Normally, the face portion of the head of an iron-type golf club has a shape in which the length on the heel side is short when viewed in the top / sole direction and becomes longer as it moves to the toe side. Since the face portion having such a shape is fixed so that a cavity is formed with respect to the head body, the region that greatly bends as the entire face portion is located at the center position when viewed in the effective hitting region. On the other hand, it is on the toe side. Even on the toe side, the face portion has a shape in which the top portion gradually rises toward the toe side, so that the large deflection is on the toe side as viewed from the center position.

In the iron type golf club having the above-described configuration and the head thereof, the maximum thickness portion is formed on the toe side from the center position of the effective hitting region of the face portion, so that the bending of the greatly bent region is suppressed. Become. In addition, a rib extending from the maximum thickness portion toward the heel side is formed on the back surface of the face portion, and the cross-sectional area of the rib is reduced from the maximum thickness portion toward the heel side. Therefore, in the region where it becomes difficult to bend gradually toward the heel side, the bending is not greatly suppressed. That is, as the transition to the heel side occurs, the rib formed on the back surface of the face portion is formed so that the cross-sectional area is reduced, so that the effect of suppressing the bending by the rib is reduced, and the entire face portion is towed. -When viewed in the heel direction, a well-balanced deflection state can be obtained, so that even if the hit points vary in the toe / heel direction, the resilience will not be extremely different depending on the hit point position, and the flight distance Stabilization can be achieved. Moreover, in the said structure, in addition to being able to aim at the low center of gravity etc. by forming so that the thickness of the area | region on the toe side might become the thinnest, the whole rigidity can also be suppressed.

  In the above-described configuration, the surface of the face portion (the hitting ball side) is flat, and such a thickness change appears on the back surface side of the face portion. In this case, the maximum thick portion only needs to exist on the toe side with respect to the center position when viewed in the effective spot area, and the range of the maximum thick portion may be a point or to some extent. It may be formed in the range of. In addition, the effective hit point area means an area where a score line is formed when viewed on the face surface.

  According to the present invention, an iron-type golf club having a head structure in which the face portion can be reduced in weight and strength, and the resilience is enhanced, so that even if hitting occurs in the toe-heel direction, the flying distance variation is small. And such an iron type golf club head is obtained.

1 is a front view showing a first embodiment of an iron-type golf club according to the present invention. Sectional drawing along the AA line of FIG. The figure which looked at the face part from the back side. Sectional drawing along the BB line of FIG. Sectional drawing along CC line of FIG. Sectional drawing along the DD line | wire of FIG. Sectional drawing along the EE line of FIG. It is a figure which shows the modification of a face part, and is the figure which looked at the face part from the back surface side. It is a figure which shows the 2nd modification of a face part, and is a front view of a head part. It is a figure which shows the 3rd modification of a face part, and is a front view of a head part. Sectional drawing along the FF line of FIG.

Embodiments of an iron type golf club and a head thereof according to the present invention will be described below with reference to the accompanying drawings.
FIGS. 1 to 3 are views showing an embodiment of the present invention, FIG. 1 is a front view of an iron type golf club, FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is a view of the face portion viewed from the back side.

  The golf club 1 according to the present embodiment includes a shaft 3, a head main body 5, and a face portion (material) 6 formed as a separate body from the head main body 5. 5 is fixed. The shaft 3 and the head body 5 are set so that a predetermined lie angle α is formed between the axis X of the shaft 3 and the reference horizontal plane P when the golf club 1 is held with respect to the reference horizontal plane P.

  The head body 5 is formed with a hosel 5a for inserting the shaft 3 through the socket 7 and fixing the tip region, and the face portion 6 has a flat face surface 6F on which a hit ball is formed. It is fixed to the stepped portion (face support portion) 5c formed in the opening 5b of the head body 5 formed in a ring shape by caulking, welding, adhesion or the like so as to have a predetermined loft angle β. Has been.

  The head body 5 and the face portion 6 can be integrally formed by casting or the like using a metal material such as titanium, titanium alloy, stainless steel, carbon steel, or tungsten, for example. It is preferable to form by forging so that the thickness can be reduced with high strength.

  The head body 5 includes a top portion 5d, a sole portion 5e, a toe portion 5f, and a heel portion 5g, which are fixed to a step portion 5c formed around the opening 5b. Is extended rearward from the periphery of the face portion. In this case, the top portion 5d extends to the back side and is bent so that the tip side hangs downward, and the sole portion 5e is raised upward while extending to the back side, and the tip thereof is towed. It extends to a substantially intermediate position between the portion 5f and the heel portion 5g (see FIG. 2). Similarly, the toe portion 5f and the heel portion 5g extend to the back side, and the front end side thereof is bent toward the center, so that the head body 5 has a cavity structure (cavity structure) in which the rear side of the face portion 6 is opened. Is indicated by a symbol R). The sole portion 5e may be formed of a material having a specific gravity higher than that of the constituent material of the head main body 5 so that the center of gravity can be lowered, or a separate weight member may be attached. .

  The head body 5 and the face portion 6 have a shape that increases in height as they move from the heel side to the toe side. The face portion 6 having a similar shape has a score along the toe-heel direction. A plurality of lines 6L are formed. As shown in FIG. 1, the area where the score line 6 </ b> L is formed becomes an effective spot area W of the face portion 6.

  The face portion 6 to be fixed as described above is supported by the periphery 6f being applied to the step portion 5c, and the rear side has a cavity structure, so that the face portion as a whole bends. Is possible. In this case, the face portion 6 is the region where the center region is most easily bent. As described above, the face portion 6 of the head of the iron type golf club has a heel side length when viewed in the top / sole direction. It is short and has a shape that becomes longer as it shifts to the toe side, and the top portion 5d gradually rises toward the toe side.

  For this reason, the region that bends greatly as the face portion is on the toe side with respect to the center position C when viewed in the effective spot region W. Here, the center position C is a perpendicular line when a perpendicular line L is drawn with respect to the reference horizontal line P from the midpoint C1 in the toe-heel direction of the area where the score line 6L is formed (effective striking point area W). It is defined by the midpoint of the line segment by points P1 and P2 (identified by the edges of the face portion) intersecting the top portion and the sole portion of the face portion 6 in L. Further, the sweet spot S of the head depends on the center of gravity G of the head main body 5 to which the face portion 6 is fixed. Usually, the head main body 5 forms a hosel on the heel side as shown in FIG. The sweet spot S does not exactly coincide with the center position C because the weight is biased toward the heel and the sole portion is weighted so as to reduce the center of gravity, but for the reason described above, It is considered that the center position C exists on the heel side and the sole side.

  The face portion 6 fixed to the head main body 5 has a structure in which the wall thickness is changed so that the deflection balance can be improved even if the hit points vary in the toe-heel direction. Hereinafter, the thickness changing structure of the face portion 6 will be specifically described.

  The face portion 6 is formed with a maximum thickness portion 10 on the toe side from the center position C specified as described above. The maximum thickness portion 10 is the portion where the thickness is the largest when considering the thickness of the entire face portion, and such a thick portion has a function of increasing the rigidity and suppressing the bending. doing. As described above, when the face portion 6 is viewed in the effective hitting area, the portion that is easily bent is on the toe side with respect to the center position C. The bending of the bending area is suppressed. In this embodiment, as will be described later, the maximum thick portion 10 is formed on the toe side and the top side with respect to the center position C.

  In this case, the maximum thick portion 10 may be specified by a point, or may be formed in a certain range (flat surface). Further, the maximum thickness portion 10 only needs to be located on the toe side relative to the center position C, but in the toe-heel direction, if the distance is too close to the center position C, the tendency of excessively suppressing the overall rebound increases. As shown in FIG. 1, it is possible to reduce the weight of the toe side and to reduce the weight of the center of gravity, etc. by forming it so as to be within a range of ¼ W from the toe side edge W1 in the range of the effective spot area W. The remaining power is preferable.

  A rib 12 is formed on the back surface of the face portion 6 so as to extend toward the heel side from the maximum thick portion 10 formed at the above-described position. The rib 12 is formed so as to improve the bending balance of the face portion 6 along the toe-heel direction. Specifically, the rib 12 extends from the maximum thick portion 10 toward the heel side. The cross-sectional area is formed so as to decrease. Normally, by forming a rib, an effect is obtained in which the rigidity is increased in the peripheral region and bending is suppressed, but the rigidity varies depending on the cross-sectional area of the rib (if the cross-sectional area of the rib is reduced, The difficulty of bending is reduced).

  As described above, the face portion 6 is configured such that the heel side is difficult to bend due to its shape. Therefore, when the rib 12 is formed, if the cross-sectional area is the same, the heel side is more difficult to bend and the flex balance is reduced. Will fall. In this embodiment, as shown in FIG. 3, when the width on the toe side is w1, and the width on the heel side is w2, the rib 12 is formed so that w1> w2, and further, FIG. As shown in FIG. 5, the height of the rib 12 is also set so that h1> h2 when the height on the toe side is h1 and the height on the heel side is h2, and the cross-sectional area thereof is the heel. The side is made smaller.

  Thus, the rib 12 has a reduced heel side cross-sectional area compared to the toe side cross-sectional area, so that the degree of difficulty of bending due to the rib is mitigated as it shifts to the heel side, and the face It is possible to improve the bending balance of the part in the toe-heel direction. In particular, when the entire face portion is thinned to have a structure that can be easily bent, the bending balance can be improved by forming the rib having a reduced cross-sectional area as described above.

  As shown in FIG. 1, the rib 12 of the present embodiment is formed so as to extend from the maximum thick portion 10 to the heel side (the edge W2 on the heel side of the effective hitting area W). What is necessary is just to form in the range W3 of 1 / 2W including a center at least with respect to the effective spot area W so that the suppression effect of bending may be exhibited. Further, as shown in FIGS. 3 and 4, the rib 12 is preferably formed so that the width and the height continuously decrease as it moves to the heel side, thereby stress concentration. Difficult structure can be achieved. Moreover, it is good also as the largest thick part 10 by the fixed width and height which followed the toe side edge part of the rib 12. FIG.

  In addition, at least the rib 12 is preferably formed on the top side of the ball hitting position of the face portion 6. Specifically, the entire rib is positioned on the top side with respect to the contact point K (striking point position) of the ball B when the head body 5 is installed at a specified loft angle or lie angle with respect to the reference horizontal plane P. (In FIG. 1, the position of the contact point K along the toe-heel direction is shown as a line L2, and the rib 12 is formed on the top side of the line L2. ing). By setting the formation position of the rib 12 in this way, the position where the ball hits when hitting the ball is less likely to be on the rib 12, and it is possible to prevent the hit feeling from being lowered. It becomes possible.

  Further, the rib 12 may be formed on the top side with respect to the above-described line L2 and so as to extend in the toe-heel direction, but the top portion of the face portion faces the toe side. Since the shape gradually increases, the large deflection is on the toe side as viewed from the central position, and tends to be on the top side. It is formed on the top side so as to suppress the bending of the region that is greatly bent so that the bending can be efficiently suppressed and the bending balance can be improved. Specifically, the intersection points of the toe side edge W1 and the heel side edge W2 of the effective hitting area W and the above-described line L2 are P3 and P4, respectively, and the top side edge of the toe side edge W1 is P5, When the top edge of the heel side edge W2 is P6, the midpoint of P3 and P5 is P7, and the midpoint of P4 and P6 is P8, the rib 12 is on the line L3 connecting the midpoints P7 and P8. It is formed to be located. That is, the line L3 connecting the midpoints P7 and P8 is in a direction along the geometric center line of the toe heel and has a high reinforcing effect and is considered to be above the hit point. By forming the ribs 12 along the ribs, it is possible to efficiently improve the strength, suppress the bending, and improve the bending balance without increasing the weight of the ribs. In the present embodiment, as shown in FIG. 1, the center line of the extending rib 12 is formed so as to coincide with the line L3 defined as described above. You may form so that a part may overlap.

  Further, the face portion 6 may have the same thickness except for the position where the maximum thickness portion 10 and the rib 12 are formed. However, the region M1 on the sole side with the rib 12 as a boundary. It is preferable that the thickness of the region M2 on the top side is made thinner than that.

  With this configuration, the necessary strength on the sole side in the vicinity of the hit point position (near the line L2) can be obtained, and the top side can be reduced in weight. The degree becomes higher. Further, even if the sole portion is thick, since the thin region is formed on the top side, the overall rigidity does not increase, and the flight distance can hardly be reduced.

  In the present embodiment, in addition to the ribs 12 described above, two ribs 22 and 32 extending from the maximum thick portion 10 are formed. Of these, the ribs 22 are formed so as to extend upward from the maximum thick portion 10 toward the toe side, and are formed so as to intersect at the end position of the top portion 5d. Further, the rib 32 is formed so as to extend downward from the maximum thickness portion 10 toward the toe side, and as shown in the drawing, it is formed so as to intersect below a substantially middle position of the toe portion 5f. Thus, the repulsion on the lower side of the face toe side may be suppressed.

  As described above, in addition to the rib 12 described above, the ribs 22 and 32 are formed in accordance with the shape of the face portion from the most easily bent region (maximum thick portion 10). The reinforcement effect makes it possible to reduce the thickness of the entire face portion, and to obtain a lightweight, high-strength and highly repulsive face structure.

Also, the ribs 22 and 32 are preferably formed so that the cross-sectional area decreases from the thickest portion 10 toward the peripheral portion, similarly to the rib 12.
By forming the ribs 22 and 32 in this way, the face portion can be effectively thinned and the face portion can be made lightweight and high in strength.

  Further, by forming the ribs (substantially Y-shaped ribs 12, 22, 32) as described above, three areas are formed on the back surface of the face portion 6 (the above-mentioned area on the sole side). M1, top side region M2, and toe side region M3). The three regions M1 to M3 are preferably formed so that the thickness of the sole-side region M1> the thickness of the top-side region M2> the thickness of the toe-side region M3. That is, by forming the toe side region M3 to be the thinnest, the overall rigidity can be suppressed in addition to the reduction in the center of gravity as described above.

  Specifically, the thickness of the maximum thickness portion 10 is 2.5 mm, the thickness of the region M1 on the sole side is 2.1 mm, the thickness of the region M2 on the top side is 1.8 mm, It is possible to set the thickness of the side region M3 to 1.5 mm. In this case, the thickness of the maximum thickness portion 10 and the thickness of each region M1 to M3 can be appropriately modified, but the thickness difference between the regions is too large, Since stress is concentrated at the boundary portion or the flex balance is lost, it is preferable to set the thickness to about 0.2 to 0.5 mm. In each region, it is not always necessary to make the wall thickness uniform. For example, the wall thickness may be changed by gradually decreasing the thickness as the region moves.

  Further, the three ribs 12, 22, and 32 described above have a predetermined crossing angle (toe side crossing angle θ1, top side crossing angle θ2, and sole side crossing angle θ3) centering on the maximum thickness portion 10. The ribs are preferably formed so that the crossing angle θ2 of the ribs and the crossing angle θ3 of the sole side are obtuse angles (greater than 90 °). That is, the ribs 22 and 32 are formed to have an obtuse angle because when the crossing angles θ2 and θ3 are acute angles (right angles), the vertical deflection is suppressed and the repulsive force is reduced. Is preferred. The toe side crossing angle θ1 may be an acute angle, but the crossing angles θ1 to θ3 are all obtuse angles so that the entire face portion can be thinned and the deflection balance can be further improved. It is preferable to form it like this.

  According to the iron type golf club having the above-described configuration, the maximum thickness portion 10 is formed on the toe side with respect to the center position C of the effective hitting region of the face portion 6 so that the bending of the greatly bent region is suppressed. become. Further, a rib 12 is formed on the back surface of the face portion so as to extend from the maximum thick portion 10 toward the heel side, and the cross-sectional area of the rib decreases from the maximum thick portion 10 toward the heel side. Therefore, the effect of suppressing the bending on the heel side is reduced. That is, as the transition to the heel side is effected, the effect of suppressing the bending by the ribs 12 is reduced. Therefore, when the entire face portion is viewed in the toe-heel direction, a well-balanced bending state is obtained. Even if the hit points vary in the direction, the resilience will not be extremely different depending on the hit point position, and the flight distance can be stabilized.

  In addition, by forming such ribs, it is possible to increase the resilience by reducing the thickness of the face part while maintaining strength, and by further reducing the weight of the face part, the degree of freedom in design can be improved. It will be able to plan.

  Further, in the present embodiment, as described above, the ribs 22 and 32 are formed in addition to the ribs 12, so that the face portion can be efficiently reinforced, and the face structure is made thinner and highly repulsive. can do.

The configuration of the ribs 12, 22, and 32 formed as described above can be modified as appropriate. Specifically, the rib structure of this embodiment will be specifically described with reference to FIGS.
In these drawings, FIG. 4 is a sectional view taken along line BB in FIG. 3, FIG. 5 is a sectional view taken along line CC in FIG. 3, and FIG. FIG. 7 is a sectional view taken along line E-E in FIG. 3.

As described above, the rib 12 is formed so that the cross-sectional area decreases as it moves to the heel side. In this case, the cross-sectional shape of the rib 12 is not particularly limited, but in the present embodiment, the cross-section is formed in a substantially trapezoidal shape. In addition, as shown in FIG. 4, the rib 12 is gradually lowered in height as it moves toward the heel side, as shown in FIG. 4, and as shown in FIG. The width (the width of the lower base) is also gradually narrowed as it shifts to the heel side.
The cross sections of the ribs 22 and 32 are also substantially trapezoidal (similar to the rib 12, the cross-sectional area may be reduced as it moves to the peripheral edge).

  As described above, by making the cross-sectional shape of the rib substantially trapezoidal, as shown in FIG. 5, the rib can be thickened in a tapered shape having a predetermined inclination angle with respect to the back surface of the face portion. The stress concentration can be relaxed as compared with a rib having a configuration that stands perpendicularly. That is, when the inclination angles of the respective taper of the rib 12 (the taper 12a on the region M1 side and the taper 12b on the region M2 side) are θ4 and θ5, respectively, by setting θ4 and θ5 to less than 90 °, the stress concentration Can be relaxed (the smaller the angle, the less the stress concentration).

  As described above, since the thickness of the region M2 is formed thinner than the thickness of the region M1, the inclination angle θ5 on the side of the region M2 where the thickness is reduced is the region M1 where the thickness is increased. It is preferable to set it to be equal to or smaller than the side inclination angle θ4 (θ5 ≦ θ4). That is, by forming in this way, the stress concentration on both sides of the rib 12 can be relaxed in a balanced manner. In this case, the widths wa and wb of the respective tapers 12a and 12b are formed such that wb> wa.

  On the other hand, the inclination angles θ4 and θ5 can be set to θ5> θ4. However, in this case, since the taper width is increased and the weight is increased, the widths wa and wb of the respective tapers 12a and 12b are preferably formed so that wb ≦ wa.

  Further, as shown in FIG. 6, the rib 32 can be thickened in a tapered shape having a predetermined inclination angle with respect to the back surface of the face portion by making the cross-sectional shape substantially trapezoidal as shown in FIG. It is possible to reduce stress concentration. That is, when the inclination angles of the respective taper of the rib 32 (the taper 32a on the region M1 side and the taper 32b on the region M3 side) are θ6 and θ7, respectively, the stress concentration is set by setting θ6 and θ7 to less than 90 °. Can be relaxed.

  In this case, as described above, since the thickness of the region M3 is formed thinner than the thickness of the region M1, the inclination angle θ7 on the side of the region M3 where the thickness is reduced is the region where the thickness is increased. It is preferable to set the inclination angle on the M1 side to be equal to or smaller than θ6 (θ7 ≦ θ6). That is, by forming in this way, the stress concentration on both sides of the rib 32 can be relaxed with a good balance. In this case, the widths wa ′ and wb ′ of the respective tapers 32a and 32b are formed so that wb ′> wa ′.

  Note that the inclination angles θ6 and θ7 can be set to θ7> θ6. However, like the rib 12, the widths wa ′ and wb ′ of the respective tapers 32a and 32b are preferably formed so that wb ′ ≦ wa ′.

  Further, as shown in FIG. 7, the rib 22 can be thickened in a tapered shape having a predetermined inclination angle with respect to the back surface of the face portion by making the cross-sectional shape substantially trapezoidal as shown in FIG. 7. It is possible to reduce stress concentration. That is, when the inclination angles of the tapers (the taper 22a on the region M3 side and the taper 22b on the region M2 side) of the rib 22 are θ8 and θ9, respectively, the stress concentration is set by setting θ8 and θ9 to less than 90 °. Can be relaxed.

  In this case, as described above, since the thickness of the region M3 is formed thinner than the thickness of the region M2, the inclination angle θ8 on the side of the region M3 where the thickness is reduced is the region where the thickness is increased. It is preferable to set it to be equal to or less than the inclination angle θ9 on the M2 side (θ8 ≦ θ9). That is, by forming in this way, the stress concentration on both sides of the rib 22 can be relaxed with a good balance. In this case, the widths wa ″ and wb ″ of the respective tapers 22a and 22b are formed so that wa ″> wb ″.

  Note that the inclination angles θ8 and θ9 can be set to θ8> θ9. However, like the ribs 12 and 32 described above, the widths wa ″ and wb ″ of the respective tapers 22a and 22b are preferably formed so that wa ″ ≦ wb ″.

  Each of the ribs 12, 22, and 32 described above has a substantially trapezoidal cross section, but may be formed to have a triangular cross section as shown in the modification of FIG. With this configuration, the rib can be reduced in weight compared to the substantially trapezoidal shape, and the entire face portion can be reduced in weight.

  Furthermore, in this modification, the maximum thick portion 10 is formed in a dot shape, and the rib 12 extending from the maximum thick portion 10 toward the heel side is terminated in the middle without extending to the heel portion. Specifically, ribs 12 are formed in the range from the heel side (the heel side edge W2 of the effective hitting area W) to ¼ W, thereby making the heel side easy to bend and resilience. Can be improved. The ribs 22 and 32 are formed so that the cross-sectional area decreases toward the peripheral edge.

FIG. 9 is a view showing a second modification of the face portion, and is a front view of the head portion.
In the second modified example, the position of the maximum thick portion 10A is formed so as to be on the toe side and on the sole side with respect to the center position C of the effective hitting point region W. In such a configuration, the position of the rib 12A is shifted to the sole side as a whole than the rib 12 of the above-described embodiment, the rib 22A is longer than the rib 22 of the above-described embodiment, and the rib 32A is It becomes shorter than the rib 32 of the above-described embodiment.

  For this reason, the top side region M2 is wider than the top side region shown in FIG. 1, which makes it possible to increase the rebound of the entire face and reduce the center of gravity. Become. Even in such a configuration, the rib 12A is preferably formed to be on the top side of the line L2.

10 and 11 are views showing a third modification of the face portion, FIG. 10 is a front view of the head portion, and FIG. 11 is a cross-sectional view taken along the line FF in FIG.
In this modified example, the position of the maximum thick portion 10B is formed on the toe side and the top side with respect to the center position C of the effective hitting area W as in the configuration shown in FIG. The extending rib 12B is formed to face the sole side more than the configuration shown in FIG. Specifically, the heel side edge W2 defined in FIG. 1 is formed so as to intersect with a lower side than the middle point P8.

  As described above, in the iron type golf club head, the length in the vertical direction on the heel side is shortened, and the repulsion at that portion is reduced. Therefore, the rib 12B is positioned more than the midpoint P8 on the heel side edge W2. By intersecting on the lower side, the thin-walled region M2 on the heel side becomes wide, and the resilience on the heel side can be improved. Further, according to such a rib shape, it is possible to cross more score lines 6L as compared with the configuration shown in FIG. 1, so that the strength can be improved and the face portion 6 can be made thinner. Is possible.

In addition, the rib shape (here, the cross-sectional shape of the rib 32B among the substantially Y-shaped ribs 12B, 22B, and 32B) is curved from the back surface of the face portion 6 as shown in FIG. R surfaces 32a ′ and 32b ′ are preferably used so as to rise (R surfaces whose cross-sectional shape rises in a curved shape).
Stress concentration can be prevented by making the rib rise in the curved surface in this way, and thereby it becomes possible to increase the height difference with the rib 32 as a boundary.

  Further, in such a rib shape, the boundary portions 32a ″ and 32b ″ with the top plane 32d of the rib are not curved surfaces, but are formed in an edge shape so that a sharp impression can be obtained even when the height difference is low. And a feeling of reinforcement can be given, and the appearance of the cavity portion can be improved.

  In this modified example as well, the maximum thickness portion may be formed in a dot shape or the cross-sectional shape may be modified, as in the configuration shown in FIG. Further, the rib 12B may be configured not to reach the heel.

While the embodiments of the golf club and the golf club head according to the present invention have been described above, the present invention forms the maximum thick portion on the toe side relative to the center position of the effective hitting area, and the back surface of the face portion. Further, the present invention is characterized in that a rib whose cross-sectional area decreases from the maximum thick portion toward the heel side is formed.
For this reason, about the cross-sectional shape of the above-mentioned rib, it is not limited to a special form, Moreover, it can change suitably also about the method of reduction of a cross-sectional area. For example, the width may be constant and the height may be changed, or the height may be constant and the width may be changed. Further, as for the direction in which the rib extends, it suffices if the rib extends from the maximum thickness portion toward the heel side, and it is slightly curved other than the one formed linearly as in this embodiment. Even if it is a shape like this, it does not interfere. Further, the surface of the rib may be formed in a curved shape other than the flat surface or the pointed state as described above. Further, the connection between the rib side surface and the back surface of the face may be formed in a curved shape. Furthermore, the method of reducing the cross-sectional area may be a configuration in which the cross-sectional area is decreased stepwise in addition to continuously decreasing.

  Moreover, the head main body should just be a cavity structure, and is not limited to the shape shown in the figure. For example, the head main body may be integrated by forming a plurality of parts with different materials without welding them together and welding them. The face portion may be formed integrally with the head body.

DESCRIPTION OF SYMBOLS 1 Golf club 3 Shaft 5 Head main body 6 Face part 10, 10A, 10B Maximum thickness part 12, 12A, 12B, 22, 22A, 22B, 32, 32A, 32B Rib B Ball C Center position G Center of gravity P Reference horizontal plane S Sweet Spot W effective dot area

Claims (6)

A face portion having a face surface on which a hit ball is formed, a head body having a cavity formed by a top portion, a sole portion, a toe portion, and a heel portion while supporting the face portion at a predetermined loft angle; In an iron type golf club having a shaft fixed to the head body,
Forming a maximum thick portion on the toe side from the center position of the effective spot area of the face portion, and forming a rib extending from the maximum thick portion toward the heel side on the back surface of the face portion;
The rib has a reduced cross-sectional area from the maximum thickness portion toward the heel side ,
From the maximum thickness portion, further forming a rib extending toward the upper side of the toe side and the lower side of the toe side,
The face section divided into three regions by the rib is formed so that the thickness of the sole side region> the thickness of the top side region> the thickness of the toe side region. Iron type golf club. It said toe side upward from a maximum thick-walled portion, and a rib extending toward the toe side downward, toward the periphery from the maximum thickness portion, claim 1, characterized in that the cross-sectional area is reduced The iron-type golf club described in 1. 3. The iron type golf club according to claim 1, wherein the maximum thickness portion is formed on a toe side and a top side of a center position of an effective hitting area of the face portion. An iron type golf club having a face portion having a face surface on which a hit ball is formed, and a cavity formed by a top portion, a sole portion, a toe portion and a heel portion while supporting the face portion at a predetermined loft angle. In the head
Forming a maximum thick portion on the toe side from the center position of the effective spot area of the face portion, and forming a rib extending from the maximum thick portion toward the heel side on the back surface of the face portion;
The rib has a reduced cross-sectional area from the maximum thickness portion toward the heel side ,
From the maximum thickness portion, further forming a rib extending toward the upper side of the toe side and the lower side of the toe side,
The face section divided into three regions by the rib is formed so that the thickness of the sole side region> the thickness of the top side region> the thickness of the toe side region. Iron type golf club head. It said toe side upward from a maximum thick-walled portion, and a rib extending toward the toe side downward, toward the periphery from the maximum thickness portion, claim 4, characterized in that the cross-sectional area is reduced The iron type golf club head described in 1. 6. The iron type golf club head according to claim 4 , wherein the maximum thickness portion is formed on a toe side and a top side of a center position of an effective hitting point area of the face portion.

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