JP2014188194A - Iron type golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an iron type golf club efficiently increased in high repulsive area without increasing the weight.SOLUTION: In a face part 6 of an iron type golf club, a maximum thickness part Q is provided from the center position C to the toe side, and thickness parts 8, 9, 10 varying in thickness to the top side, the sole side and the toe side are provided around the maximum thickness part Q. In peripheries of the thickness parts 8, 9, 10, thin parts 20a, 20b, 20c which are thinner than the thickness parts are continuously formed, and the thickness part 10 formed on the toe side is provided with the thin part 20c recessed toward the heel side.

Description

  The present invention relates to an iron type golf club.

  Normally, the head of an iron type golf club has a face part on which a hit ball is formed integrally with the head main body, or a face part (face member) separate from the head main body is bonded, welded, and caulked to the head main body. It is known to integrate by such means. It is also known to improve the flight distance by reducing the wall thickness of the face and utilizing the deflection at the time of hitting to improve the coefficient of restitution.

  However, the wall thickness is often uniform and thin, and as a result, the coefficient of restitution at the center of the face (the midpoint of the maximum width in the toe and heel direction at the face) is the highest and moves to the periphery. As a result, the coefficient of restitution drops rapidly, and the initial velocity difference between the hit ball at the center position and the hit ball at the off-center position increases, and the flight distance variation increases. In particular, in an iron head, a hosel portion exists on the heel side and a low center of gravity is achieved. Therefore, generally, a sweet spot (intersection when a perpendicular line is drawn from the center of gravity position to the face surface) It is located on the heel side and the sole side from the center position. For this reason, there is a deviation between the center position where the golfer is most conscious of hitting the ball and the position where the golf ball hits most efficiently and the flight distance comes out (sweet spot position). You will feel variation.

  Therefore, in Patent Document 1, a maximum thickness portion is formed at the center position of the face portion, and a thickness change portion (taper) is formed on the top side and the sole side from here. An iron-type golf club has been proposed in which the toe-side spread angle θ1 is larger than the heel-side spread angle θ2 with respect to the spread angle of the thin-walled region sandwiched between the sole-side thickness change portions.

  According to the configuration described above, the maximum thickness portion is formed at the center position of the face portion, so that bending at the center position of the face portion is suppressed, and the thin thickness region on the toe side is changed to the thin thickness region on the heel side. Compared to a wider range, the maximum deflection position of the face portion can be moved from the center position to the heel side. That is, when the maximum deflection position of the face portion approaches the sweet spot position, the hitting efficiency can be improved, and by effectively providing a thin-thick area, the center of gravity is secured on the toe side while ensuring the deflection amount area. Thus, a face structure that does not shift to 1 is obtained.

JP2012-115393A

  Normally, when a thick part is formed on the face part, it becomes difficult for the part to bend. Therefore, by making the central part of the face part the thickest, the central part is restrained from being bent. It becomes possible to expand the region where high repulsion occurs.

  However, the shape of the iron-type golf club is wider in the vertical direction on the toe side than in the vertical direction (top / sole direction) on the heel side. The area is wider than the area on the heel side. For this reason, the shape on the toe side is relatively easy to bend, and the center position of the face portion is not necessarily the most bendable position.

  That is, in the conventional structure described above, the high repulsion area can be expanded, but there is room for improvement in order to efficiently expand the high repulsion area. Further, although the high repulsion area can be enlarged by forming a thick part or a thickness change part in the face part, it is not preferable that the weight of the head becomes heavy. Furthermore, if the thick-walled area is increased, the hit feeling (hit sound, vibration, etc.) is affected.

  The present invention has been made based on the above-described problems, and an object of the present invention is to provide an iron type golf club that efficiently expands a high repulsion area without increasing the weight.

  In order to achieve the above object, the present invention is an iron type golf club having a head body having a face portion having a ball striking face and having a cavity formed on the back side of the face portion, wherein the face portion is And having a maximum thickness portion on the toe side from the center position, and having a thickness portion whose thickness changes on the top side, the sole side and the toe side around the maximum thickness portion. A thin thick portion having a thickness smaller than that of the thick portion is continuously formed around the periphery, and the thin thick portion is formed in a concave shape toward the heel side in the thick portion formed on the toe side. It is characterized by being.

  In the iron type golf club having the above-described configuration, the maximum thickness portion is provided on the toe side from the center position of the face portion, thereby suppressing the bending of the region where the face portion is easily bent. That is, the shape of the face part of the iron-type golf club is wider in the vertical direction on the toe side than in the vertical direction on the heel side (the toe side area is wider than the heel side area). Since the toe side is relatively easier to bend than the center position, by providing the maximum thickness part on the toe side than the center position, the bend in the easily bent part is suppressed, and the high repulsion area is efficiently It becomes possible to enlarge. In addition, a thick part with varying thicknesses is formed on the top side, the sole side, and the toe side centering on the maximum thick part, and the thin part is thinner than the thick part around the thick part. By continuously forming the thick part, the flexibility of the face part as a whole can be improved, and the thin part is formed concavely toward the heel side with respect to the thick part formed on the toe side. It is possible to efficiently expand the high repulsion area without increasing the weight.

  In the above configuration, since the surface of the face portion (the hitting ball side) is flat, such a maximum thickness portion, a thick portion, and a thin thickness portion appear on the back side of the face portion. . In this case, on the top side and the sole side centering on the maximum thickness portion, there are formed thick portions that become thinner toward the top side and the sole side, and the maximum thickness is on the toe side of the face portion. A thick-walled portion is formed which becomes thinner as it moves from the portion to the toe side. And such a thick part will be in the state surrounded by the thin part formed over the circumference, and the thin part which is dented in the heel side in the thick part on the toe side It is formed.

  In the above-described configuration, the maximum thickness portion varies depending on the forming material of the face portion, but the thickness is in the range of 2.0 mm to 4.0 mm so as to effectively suppress the bending of the easily bent portion. The thick portion is specified in the range of 0.2 mm to 2.3 mm with respect to the maximum thick portion specified within the above range. Moreover, the said thin thickness part continuously formed in the circumference | surroundings of a thick part is thinner than the said thick part, and the thickness is specified in 0.7mm-2.0mm. In this case, the thin-walled portion existing around the thick-walled portion may be formed to have a uniform thickness within the above-described range, or may be tapered such that the thickness gradually decreases toward the periphery. It may be formed.

  According to the present invention, it is possible to obtain an iron-type golf club that efficiently expands a high repulsion area without increasing the weight of the face portion.

1 is a front view of a head portion of a first embodiment of an iron type golf club according to the present invention. The rear view of the head part shown in FIG. Sectional drawing along the AA line of FIG. Sectional drawing which shows the example of the attachment aspect of a face part and a head main body, respectively including (a)-(d). The 2nd Embodiment of the iron-type golf club which concerns on this invention is shown, and the rear view of a head part.

Embodiments of an iron-type golf club according to the present invention will be described below with reference to the accompanying drawings.
1 to 3 show a first embodiment of an iron-type golf club according to the present invention, FIG. 1 is a front view of a head portion, FIG. 2 is a rear view of the head portion shown in FIG. 3 is a cross-sectional view taken along line AA in FIG.

  The golf club 1 according to this embodiment includes a shaft 3 and a head main body (iron head) 5, and is configured by fixing the head main body 5 to the tip of the shaft 3. 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 has a hosel 5a for inserting the shaft 3 and fixing the tip region, and a plate-like face portion 6 having a face surface 6F on which a hit ball is formed. In this case, the face portion 6 of the present embodiment is formed separately from the head main body 5, and is formed on a step portion (face support portion) 5c formed in the opening 5b of the head main body 5 formed in a ring shape. On the other hand, it is fixed by caulking, welding, adhesion or the like so as to have a predetermined loft angle β. The head body 5 and the face portion 6 are integrally formed by casting or the like using a metal material such as titanium, titanium alloy, stainless steel, carbon steel, tungsten, or tungsten alloy.

  The ring-shaped head main body 5 includes a top portion 5d, a sole portion 5e, a toe portion 5f, and a heel portion 5g, which are step portions 5c formed on the inner periphery along the opening 5b. It extends toward the rear along the periphery of the face portion fixed to the head. Thus, the head body 5 has a structure in which the rear side of the face portion 6 is open, that is, a so-called cavity structure. In this case, the top portion 5d is bent so as to extend to the back side and the tip end side hangs downward, and the sole portion 5e is raised upward while extending to the back side, and the toe portion 5f and the heel portion 5g extends to the back side and has its tip end bent toward the center.

  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. . Further, as described above, the top portion 5d, the sole portion 5e, the toe portion 5f, and the heel portion 5g are extended rearward along the periphery of the face portion, and the end portions thereof are bent toward the center side. However, this bent state can be appropriately modified. For example, as shown in FIG. 3, the bending height H of the central portion in the sole portion 5e is formed to be the lowest, and the height H is gradually increased as it shifts to the toe side and the heel side. It may be formed. Further, such a bent portion may be in a state in which a part of a thick portion described later is covered as viewed from the rear.

  The face portion 6 may be integrally formed with the head main body, but when formed as a separate body, the shape and attachment method to the head main body can be appropriately modified. For example, as shown in FIG. 4 (a), a flange 5h protruding forward may be formed on the sole portion 5e of the head, and a plate-like face portion 6 may be applied to this portion. Furthermore, a groove portion 6g may be formed in the face portion 6 along the abutting portion. For example, as shown in FIG. 4B, a flange 6h is formed on the edge of the face portion 6 on the sole side, and this flange 6h is applied to the flange 5h formed on the sole portion 5e of the head. May be. Alternatively, as shown in FIG. 4 (c), a step portion 6i may be formed in the flange 6h portion of the face portion 6 and attached to the sole portion in a thinner state. Further, for example, as shown in FIG. 4D, a plate-like face portion 6 may be applied and a groove portion 5g may be formed in the flange 5h of the sole portion 5e of the head.

  As described above, the attachment method of the face portion with respect to the head body can be appropriately modified. As described above, the groove portion and the flange are formed in the attachment portion of the face portion and the head body, thereby forming the face portion. It becomes possible to improve the flexibility of a part. In the configuration shown in FIG. 4, the attachment manner of the face portion in the sole portion of the head body is illustrated, but the top portion, the toe portion, and the heel portion can be similarly configured.

  The head body 5 and the face portion 6 have a shape in which the width in the top / sole direction (vertical direction) increases as they move from the heel side to the toe side when viewed from the front, and have the same shape. A plurality of score lines 6L are formed on the face portion 6 along the toe-heel direction.

  The face portion 6 to be fixed as described above is supported in a state where the periphery of the face portion 6 is in contact with the stepped portion 5c, and the rear side thereof has a cavity structure, so that it can bend toward the back side. It is possible. In this case, as shown in FIGS. 2 and 3, since the face portion 6 is supported by the step portion 5c, the central region surrounded by the support edge (peripheral edge portion of the cavity) E has the largest amount of deflection. However, the position where the amount of deflection becomes the largest is the center position of the face part (parallel to the reference horizontal plane P when set at a predetermined lie angle α and widest in the support state in the toe-heel direction) The intermediate point (C) of the line L1 is not exactly the same. In other words, the head shape of the iron-type golf club is wider in the vertical direction on the toe side than in the vertical direction (top / sole direction) on the heel side. Since the area of is larger than the area on the heel side, the shape on the toe side is relatively easy to bend. In addition, according to the shape of the face portion as shown in FIGS. 1 and 2, the position where bending is most likely is the toe side and the top side with respect to the center position C.

  Further, the sweet spot S of the head depends on the position of the center of gravity of the head main body 5. Normally, as shown in FIG. 1, the head main body 5 has a weight bias on the heel side, such as forming a hosel on the heel side. Therefore, it exists on the heel side with respect to the center position C of the face portion specified as described above. In this case, when a weight is arranged or weighted in the sole portion 5e in order to lower the center of gravity, the sweet spot S is shifted to the sole side from the position shown in FIGS.

  On the back surface of the face portion 6 having the above-described configuration, the thickest portion Q is provided on the toe side from the center position C. In the face portion 6 having the shape of the present embodiment, the toe side with respect to the center position C is provided. And the largest thick part Q is provided in the position used as the top side. That is, as described above, the shape of the face portion of the iron-type golf club is wider in the vertical direction on the toe side than in the vertical direction on the heel side, and is closer to the toe side than the center position C of the face portion 6. Since the direction is relatively easy to bend, by providing the maximum thick part Q on the toe side and the top side with respect to the center position C, the bend in the most bendable part is suppressed, and the high repulsion area is made efficient. Is expanding. The maximum thick portion Q may be formed in a dot shape or may be formed in a curved shape. Alternatively, a predetermined range may be formed as a flat surface.

  On the top side, sole side, and toe side centering on the maximum thick part Q formed as described above, the thick parts 8, 9, and 10 are formed which are changed in thickness (thinned in a tapered shape). In addition, thin-walled portions 20a, 20b, and 20c that are thinner than the thick-walled portions 8, 9, and 10 are continuously formed around the thick-walled portion. The thin-walled portions 20a to 20c may be thinner than the thick-walled portions 8, 9, and 10 so as to surround the thick-walled portion (a portion of the thick-walled portion is formed on the peripheral edge E of the cavity). The ridgelines R1, R2, R3 accompanying the thickness change are generated at the boundary portion.

  In this case, as shown in FIG. 2, each of the thick portions 8, 9, and 10 of the present embodiment has a corner portion between the heel side end portion P1 of the face portion and the toe-top with respect to the peripheral edge portion E of the cavity. It is formed to be closest to the peripheral edge E of the cavity at the position of the corner P3 between P2 and the toe sole.

  In the toe-side thick portion 10 formed as described above, the thin-walled portion 20c is formed to be recessed in the heel side. That is, the thick portion 10 on the toe side is recessed to the heel side with respect to a line segment connecting the corner portion P2 between the toe and the top and the corner portion P3 between the toe and the sole. Is formed so that the area of the thick portion 10 is reduced. In the present embodiment, the thin thick portion 20c formed by entering the toe side thick portion 10 is formed so as to bend toward the heel side (the ridge line R3 is curved).

  The thick portions 8, 9, and 10 are formed around the maximum thick portion Q as described above, and the thickness is thinner than the thick portions around the thick portions 8, 9, and 10. By continuously forming the thin and thick portions 20a to 20c, the high repulsion area can be expanded efficiently, thereby suppressing the variation in the flight distance and improving the flexibility of the face portion as a whole. Can be improved. In addition, the thick portion 10c formed on the toe side is formed in a concave shape with the thin thickness portion 20c facing the heel side, thereby efficiently expanding the high repulsion area without increasing the weight. Is possible. In other words, since the recessed area is originally a position where the ball is not hit, it is possible to reduce the thickness of the thick area as much as possible, thereby reducing the weight and increasing the resilience. Since the weight is not increased, a golf club that is easy to swing can be obtained.

  As described above, the sweet spot S exists on the heel side with respect to the center position C. However, the high repulsion area is expanded, so that the high repulsion state is maintained even when the sweet spot S is hit. As a result, the flight distance does not vary. That is, the resilience when hitting with the sweet spot S is improved and the initial speed can be increased efficiently, and the flight distance performance inherently possessed by the iron can be sufficiently exhibited.

  Further, as described above, the thin-walled portion 20c that is recessed in the heel side is formed in a curved shape, so that stress concentration can be prevented even if the thin-walled portion 20c is thinned to the limit. It becomes. In this case, it is preferable to make the area of the thick part 10 smaller than the area of the thin thick part 20c in the recessed part, and thereby the resilience can be further improved.

  In the present embodiment, the thick portions 8 and 9 formed on the top side and the sole side are both formed so as to become narrower as they move from the toe side to the heel side. That is, considering the vertical width, the face portion 6 has a shape that is difficult to bend on the heel side, so that both the thick portions 8 and 9 become narrower as they move from the toe side to the heel side. By forming, it is possible to expand the high repulsion area in a balanced manner. In addition, since the thick portions 8 and 9 have a shape matching the face shape, it is possible to efficiently suppress vibration at the time of hitting and to make the hitting sound quieter.

  In the above-described configuration, the thick portions 8, 9, and 10 are arranged at the heel side end portion P1, the corner portion P2 between the toe and the top, and the corner portion P3 between the toe and the sole. Since it is formed so as to be closest to the portion E, the thin-walled portions 20a to 20c are efficiently reinforced, and the repulsion property of the thin-walled portion is not lowered by not contacting the peripheral portion E. Further, the shape of the thick portions 8, 9, and 10 makes it possible to effectively suppress the vibration at the time of hitting and quiet the hitting sound.

  In the configuration described above, the maximum thickness portion Q varies depending on the material for forming the face portion 6, but the thickness is specified in the range of 2.0 mm to 4.0 mm so as to suppress bending. Further, for the thick portions 8, 9, and 10, the change in thickness is specified in the range of 0.2 mm to 2.3 mm with respect to the maximum thick portion Q specified in the above-described range. Further, the thin-walled portions 20a to 20c continuously formed around the thick-walled portions 8, 9, and 10 are thinner than the thick-walled portions 8, 9, and 10; It is specified in the range of 7 mm to 2.0 mm. In this case, each thin-walled portion may be formed to have a uniform thickness within the above-described range, or may be formed in a tapered shape such that the thickness gradually decreases toward the periphery.

  The thickness of each thin portion is preferably set so that the thin portion 20b on the sole side> the thin portion 20a on the top side> the thin portion 20c on the toe side, thereby reducing the center of gravity. The rebound area can be expanded most efficiently. In addition, such a thickness relationship improves the balance of strength in addition to the expansion of the repulsion region.

Further, the thick portions 8 and 9 in the top / sole direction at the center position C of the face portion 6 are preferably formed so that the vertical width W1 thereof is at least 10 mm.
This is because, in the central position C where the ball is hit most, the range in which the ball is crushed and contacted with high pressure at the time of hitting is about 10 mm in the top-sole direction. By doing so, vibration can be efficiently suppressed. In this case, since the vibration is efficiently suppressed by securing a large vertical width of the thick portion, with respect to the vertical width passing through the center position C (the width between the upper and lower edges of the face portion), It is good to secure 30% or more, preferably 50% or more.

Further, in the above-described configuration, the edge (ridgeline R1) on the top side of the thick portion 8 and the edge on the sole side (ridgeline R2) of the thick portion 9 are respectively shown in FIG. It is preferable to be formed substantially parallel to the top side peripheral edge and the sole side peripheral edge.
By forming the thick portions 8 and 9 in this way, the thick portions are formed in a well-balanced manner along the face shape, thereby enabling the high repulsion area to be efficiently expanded. Note that the term “substantially parallel” here means that the directionality is the same, and it is sufficient that the direction does not deviate extremely.

Further, the width of the thin portion 20a on the top side and the width in the vertical direction of the thin portion 20b on the sole side are preferably formed substantially uniformly over the toe-heel direction.
By using such a thin and thick portion, it is possible to eliminate repulsion unevenness due to the difference in the hit ball position and to suppress the variation in the flight distance.

  The thick portions 8, 9, and 10 in the present embodiment are formed so as to gradually become thinner toward the edge E on the top side, the sole side, and the top side with the maximum thick portion Q as the center. For this reason, a boundary is formed in the adjacent regions of the thick portions 8, 9, and 10. Such a boundary may be visible as ridgelines R4, R5, R6 as shown in FIG. 2, or the boundary may be formed by a curved surface. Further, such a boundary may be a straight line or a curved boundary like the ridgelines R4, R5, and R6 in FIG.

Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a rear view of the head portion. In the following embodiments, parts different from those of the first embodiment will be described, and the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The thick portions 8 ′, 9 ′, and 10 ′ formed on the face portion 6 of the present embodiment are the heel side end portion P <b> 1 of the face portion, the corner portion P <b> 2 between the toe and the top, and the corner portion between the toe and the sole. It is formed to have a predetermined width at the position P3, and the thin-walled portion corresponding to this position is gradually thinned from the end of the thick-walled portion having the predetermined width toward the peripheral edge E of the cavity. (In FIG. 5, the thinned portions are indicated by reference numerals 21, 22, and 23).

  By forming in this way, a step does not occur in the portion that transitions from the thick portion to the peripheral portion E, stress concentration can be avoided, and vibration during hitting can be reduced.

Further, in the above-described configuration, the thin thick portion 20c formed so as to be recessed in the toe side thick portion 10 ′ is formed in a linear shape so that the ridgeline R3 is parallel to the ridgelines R5 and R6, Thereby, as many thin-walled regions 20c that are recessed toward the heel side are secured as much as possible.
Thus, by securing a large number of thin-walled regions 20c, the flexibility can be improved and the weight can be reduced.

Further, in the present embodiment, the thin portion 20a on the top side is formed so that the vertical width gradually increases as it moves from the toe side to the heel side.
By forming the thin and thick portion 20a in this way, the heel side that is difficult to bend can be easily bent, and the overall balance can be improved and the high repulsion area can be expanded. Of course, the thin-walled portion 20b on the sole side may also be formed so that the vertical width gradually increases as it moves from the toe side to the heel side.

Further, in the face portion 6 of the present embodiment, a groove portion 6g is formed along the peripheral edge portion E of the cavity on the sole side.
As described above, by forming the groove portion along the peripheral edge portion E of the cavity, it is possible to improve the flexibility of the face portion.

As mentioned above, although embodiment of the golf club which concerns on this invention was described, this invention is not limited to above-described embodiment, Various deformation | transformation is possible.
For example, the degree of the width of the toe side relative to the heel side in the shape of the head main body is not limited to the shape shown in the figure. That is, the toe side may be slightly wider than the heel side. In such a face shape, the maximum thick portion Q is located on the toe side with respect to the center position C of the face portion. Shift to. Further, each of the thick portions 8, 9, and 10 may be linearly changed in thickness, or may be changed in a curved shape.

DESCRIPTION OF SYMBOLS 1 Golf club 3 Shaft 5 Head main body 6 Face part 8, 9, 10 Thick part 20a, 20b, 20c Thin thick part C Center position E Face peripheral part Q Cavity part P Maximum thick part P Reference horizontal plane S Sweet spot

Claims (8)

An iron-type golf club having a head body having a face portion provided with a ball striking surface and having a cavity formed on the back side of the face portion,
The face portion has a maximum thickness portion on the toe side from a central position, and has a thick portion whose thickness changes on the top side, the sole side, and the toe side around the maximum thickness portion,
Over the periphery of the thick portion, continuously forming a thin thickness portion that is thinner than the thick portion,
An iron-type golf club, wherein the thin-walled portion is formed in a concave shape toward the heel side in the thick-walled portion formed on the toe side.   2. The iron type golf club according to claim 1, wherein the thick portion formed on the top side and the sole side is formed narrower as it moves from the toe side to the heel side.   The thickness of the thin portion formed around the thick portion is formed such that the thin portion on the sole side> the thin portion on the top side> the thin portion on the toe side. The iron type golf club according to claim 1 or 2.   4. The iron-type golf club according to claim 1, wherein the thick portion in the top / sole direction at a center position of the face portion is at least 10 mm. 5.   The thick part is closest to the peripheral edge of the cavity at the heel side end of the face, the corner between the toe and the top, and the corner between the toe and the sole. The iron-type golf club according to any one of 1 to 4. The thick part has a predetermined width at the heel side end of the face part, the corner between the toe and the top, and the corner between the toe and the sole,
6. The thin-walled portion according to claim 1, wherein the thin-walled portion is gradually thinned from an end portion of the thick-walled portion having the predetermined width toward a peripheral portion of the cavity. Iron type golf club.   The top side and the sole side edge of the thick part are formed substantially parallel to the top side peripheral part and the sole side peripheral part of the cavity, respectively. An iron-type golf club according to claim 1.   The iron-type golf club according to any one of claims 1 to 7, wherein the thin-walled portion formed in the concave shape is formed to bend toward the heel side.

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