JP5107074B2 - Golf club - Google Patents

Description

  The present invention relates to a golf club, and more particularly to a golf club having a hollow metal club head.

  In general, metal club heads have been increased in size and lowered in center of gravity in recent years in order to improve the flying distance of the hit ball and stabilize the directionality. The larger the club head, the thinner the outer shell thickness must be in relation to the weight, and the lower crown thickness etc. must be reduced to lower the center of gravity. There is.

  It has been empirically known that the hitting sound of the club head is usually low when the outer shell is sufficiently thick, resulting in a fluttering sound (short reverberation sound). If the thickness is reduced, it is impossible to obtain a metal sound with a sound quality that is moderately suppressed during hitting, like a conventional thick-walled club head. In extreme cases, a cracking sound that occurs when a tin can is hit or a high-pitched sound that sounds uncomfortable is generated, and furthermore, there is a sound cracking phenomenon in which multiple sounds are heard due to the difference in frequency. , The player may be uncomfortable.

  Also, it is possible to provide a tuning fork that emits a pleasant vibration sound in the hollow part of the club head, but such tuning fork vibrations, for example, when hit with a sweet spot or when the ball is hit with the sweet spot greatly removed, Since a unique vibration sound is generated regardless of the hitting state, the sound of the tuning fork is not a sound corresponding to the hitting state and does not adjust the sound at the time of hitting, and the hitting sound cannot be improved.

In order to improve the hitting sound of a metal club head with such a hollow structure, a plurality of linear protrusions are formed on the inner side of the crown part or the sole part in a direction substantially perpendicular to the face part, so that the reverberation sound at the time of hitting the ball is generated. An increased version has been developed (see, for example, Patent Document 1).
JP 2002-126136 A

  However, in the metal club head formed with such linear protrusions, the thickness and unevenness are adjusted over the entire crown portion and sole portion, making it difficult to reduce the overall thickness and weight. In particular, when a plurality of linear protrusions extending in a direction substantially perpendicular to the face portion are raised from the inner surface of the crown portion, the weight of the crown portion increases, and the sound is increased while the center of gravity is held at a low position. It becomes difficult. Further, even if the air reverberation is positively resonated and interfered with the dense air waves generated inside the club head at the time of hitting, and the reverberant sound is made to sound for a long time, it is difficult to adjust the hit sound of the club head itself. Further, when a weight is provided in the back portion, the adjustment becomes extremely difficult.

  The present invention has been made based on such circumstances, and an object of the present invention is to provide a golf club that is thinner and lighter while improving the strength of the sole portion and has an excellent feel at impact.

The golf club of the present invention that achieves the above object comprises a face portion, a crown portion, a sole portion, a toe side and a heel side side portion, and a back portion at the rear portion, each having a golf ball hitting surface formed on the front surface. A golf club having a hollow metal club head in which a shell is formed and an internal space is formed in the outer shell, wherein the back portion is provided with a weight portion, and the sole portion is a thin portion having a thickness of less than 1 mm A toe-side curved rib extending from the position separated from the inner surface of the face part in the face-back direction and having an intermediate region protruding from the toe side toward the heel side and overlapping the thin part, and separated from the inner surface of the face part JP that projecting from the inner space extends and a central region situated in the face-back direction and a heel side curved rib overlapping the thin portion protrudes toe side from the inner surface of the sole portion To.

  A concave portion that is longer in the face / back direction than the toe / heel direction and that is recessed into the inner space side is formed in the thin-walled thick portion, and the toe side curved rib and the heel side curved rib cross the corresponding concave portions, respectively. Preferably it extends.

  According to the golf club of the present invention having such features, the weight is reduced by the thin portion provided in the sole portion, and the toe side curved rib and the heel side curved rib that the intermediate portion overlaps with the thin portion are provided. The thin-walled portion is strengthened, and further, these curved toe side curved ribs and heel side curved ribs can transmit the weight of the weight portion to the face portion in a soft manner, and the hitting sound and feel can be softened. Even if the hit points vary, an approximate hitting sound and hit feeling can be obtained, thereby providing a golf club that is thinner and lighter while improving the strength of the sole portion and has an excellent hit feeling.

  When the toe-side curved rib and the heel-side curved rib of the sole portion extend across the recessed portion formed in the thin-walled thick portion, the deformation of the sole portion at the time of hitting is deformed by the curved shape of the recessed portion and the reinforcing effect by the rib. And the mass of the weight portion of the back portion can be reliably transmitted to the face portion.

  1 to 7 show a metal club head 10 used in a golf club 8 according to a preferred embodiment of the present invention.

  As shown in FIG. 1, a golf club 8 using the club head 10 of the present embodiment has a specified lie angle with respect to a reference horizontal plane B at the tip of a shaft 6 formed into a tubular structure with, for example, a fiber reinforced resin or a metal material. It is attached with α and a loft angle β set, and a grip 4 formed of a soft or soft material such as natural rubber or synthetic rubber is attached to the base end. Here, the lie angle α is an attachment angle of the shaft axis 6a with respect to a sole portion or a reference horizontal plane B described later.

  2 and 3 show in detail a club head 10 formed of a metal material in a hollow structure.

  In the club head 10 of this embodiment, a face member 14 having a hitting surface is disposed on the face portion 12, and the head member 10a supports the face member 14 from the back side. In the head body 10a, a crown portion 16 and a sole portion 18 extend from the upper edge portion 12a and the lower edge portion 12b of the face portion 12 to the back side, respectively. Between the crown portion 16 and the sole portion 18, the toe side side portion 20 and the heel side portion 22 are curved from the toe side and the heel side of the face portion 12 along the peripheral edge portion of the crown portion 16. It extends to the back side and continues to the back portion 24. The toe side part 20 and the heel side part 22 have large dimensions in the vertical direction, that is, the crown / sole direction on the face part 12 side, and the dimensions gradually decrease to the back part 24. Therefore, the club head 10 substantially forms an outer shell by the face portion 12, the crown portion 16, the sole portion 18, the toe side and heel side portions 20 and 22, and the back portion 24 at the rear portion. An internal space N (FIG. 4) is formed in the shell.

  The upper edge portion 12a between the face portion 12 and the crown portion 16 can be specified by a ridge line therebetween, but is specified at a portion smaller than the radius of curvature of the surface portion forming the most part of the face portion 12. May be. The same applies to other parts that define the face part 12 such as the lower edge part 12b.

  The face member 14 fixed to the front opening of the head main body 10a is formed of a plate-like member having a bulge with a central portion slightly bulged outward, and the front surface hits a golf ball. Form a surface. A large number of score lines 13 (see FIG. 1) extending in the toe-heel direction are formed on the hitting surface of the face portion 12 by a suitable means such as a shallow groove in a substantially horizontal direction. A sweet spot S, which is a point extending through the center of gravity G of the club head 10 and extending perpendicularly to the hitting surface of the face portion 12, is located.

  The face member 14 is formed of a plate-like member that closes the front side opening of the head main body 10a including the crown portion 16, the sole portion 18, the toe side and heel side portions 20, 22, and the back portion 24. 12 may be formed as a whole, or may be formed as a so-called force-up shape, and may form part of the crown portion 16, the sole portion 18, and the side portions 20 and 22 on the face portion 12 side. Furthermore, it may be formed in a plate shape that fits into an opening of a predetermined size formed in the face portion 12, and only a part of the face portion 12 may be formed.

  The head body 10a of the present embodiment is preferably integrally formed by casting, for example, a titanium-based alloy, an iron-based alloy, etc., except for the face member 14 provided on the face portion 12. In addition, an opening is formed in which a face member 14 formed in a force-up shape constituting the hitting surface of the face portion 12 is fixed by welding, adhesion or the like. Instead of such an integral structure, each member constituting the head body 10a (a member forming an outer shell such as a face portion, a crown portion, a sole portion, a side portion, etc.) is individually formed, and then assembled. They may be integrated by welding or adhesion. Furthermore, the crown portion 16 can be formed of a fiber reinforced metal, a fiber reinforced resin, or the like, or a combination of materials such as those metals and fibers.

  The face member 14 coupled to the head main body 10a is integrally formed by, for example, pressing or forging a titanium alloy, an iron alloy, or the like so as to have a predetermined force-pipe shape, For example, the average thickness of the ball striking surface including the position of the sweet spot S (the average value of the maximum thickness portion, the minimum thickness portion, and the intermediate thickness portion of each part, and at least three portions of a wide area portion with a predetermined thickness) It is preferable to form a thickness of about 1.5 mm to 3.2 mm that can withstand an impact at the time of hitting. In the case of forming with a rolled material, it is preferable to arrange the rolling direction along the crown / sole direction in order to increase the repulsive force of the face portion 12 and increase the durability. Moreover, the repulsive force can be increased while maintaining the strength by forming the portion where the sweet spot S is disposed slightly thicker than the peripheral portion.

  The face member 14 formed in this way is fixed to the end face of the opening formed in the head main body 10a by suitable means such as adhesion, welding, or brazing. Of course, the face portion 12 may be integrally formed with the head main body 10a instead of fixing the face member 14 as a separate member.

  A shaft fastening portion (not shown) for fastening the tip of the shaft 6 is integrally formed on the head body 10 a that supports the face member 14. The shaft 6 is fixed to the shaft fixing portion by inserting the tip end portion of the shaft 6 through the opening 26 a of the hosel portion 26 formed to protrude from the crown portion 16.

  The crown portion 16 of the head body 10 a forms a ridge line 28 between the toe side portion 20, the back portion 24, and the heel side portion 22. The ridge line 28 is a portion (boundary) that divides the air flow into the direction of the sole portion 18 and the direction of the cravane portion 16 during the swing. The crown portion 18 forms a top edge along the upper edge portion 12a between the crown portion 18 and the sole portion 18, and the sole portion 18 forms a leading edge along the lower edge portion 12b between the face portion 12 and the face portion 12. To do.

  As shown in FIGS. 4 and 5, a weight portion 30 is provided in the inner space N of the head body 10 a so as to bulge from the inner surface of the back portion 24. For example, the weight part 30 is firmly and firmly fixed to the inner surface of the back part 24 by a suitable means such as adhesion, welding, screwing, brazing, or the like. In this case, the back portion 24 may be formed thicker. Furthermore, you may form combining such a thick part and a weight member.

  As shown in FIG. 2, the weight portion 30 has a virtual line L connecting the sweet spot S and the center of gravity G and a position intersecting with the back portion 24 in a plan view from the crown portion 16 side. Further, it is preferable to form in a region extending from the position P to the toe side and the heel side. The area where the weight part 30 is disposed can be formed over a range substantially corresponding to the hitting surface of the face part 12, for example. In the case of extending from the position P to the toe side and the heel side, it is preferable not to form them uniformly over the entire region but to distribute them to the toe side and the heel side.

  For example, by distributing the weight distribution of the weight part 30 to the heel side more than the position P, it is easy to return the club head 10 before moving from the downswing position to the impact position, and the operability is easy to swing. The golf club 8 can be formed, and at the same time, the hit feeling on the heel side can be softened. As shown in FIG. 5, the weight portion 30 of the present embodiment is biased toward the heel side and extends to a wider area toward the heel side than extending from the position P to the toe side. Further, as shown in FIG. 4, it is preferable to lower the center of gravity by biasing the weight portion 30 toward the sole portion 18 side rather than the crown portion 16 side.

  Further, as shown in FIGS. 4 to 7, the club head 10 smoothly curves the respective wall portions forming the sole portion 18, the toe side portion 20 and the heel side portion 22 toward the inner space N side. A plurality of recesses are formed by immersing in the state of being caused to enter. The plurality of recesses include a heel side recess, a toe side recess, and a sole side recess so that a passage through which air flows as indicated by an arrow X (FIG. 7) from the heel side to the toe side is formed. Have. In the present embodiment, the toe side recess has one location (indicated by reference numeral 32), the heel side recess has one location (indicated by reference numeral 34), and the sole side recess has the heel side recess 34 formed for each one of the above, Two locations (indicated by reference numerals 36 and 38 respectively) are formed between the toe side recess 32 and the toe side recess 32.

  In the present embodiment, the heel side recess 34, the toe side recess 32, and the sole side recesses 36, 38 are arranged in the face-back direction so that air can flow more easily from the heel side to the toe side. The substantially central portion is formed with a curved surface that immerses most deeply into the internal space N. The deepest recesses of these heel side recesses 34, sole side recesses 38, 36 and toe side recesses 32 that are deepest inside the inner space N are operated to return the club head 10 from the top position when the backswing is performed. It is preferable to arrange along the line X (FIG. 7) indicating the direction of airflow flowing from the heel side toward the toe side until the position is shifted. These maximum depressions are preferably arranged linearly along the line X in consideration of the actual air flow, but each depression is slightly shifted to the face side or the back side. The entire sole portion 18 is preferably formed so that air can easily flow from the heel side toward the toe side.

  In the sole portion 18, the toe side, and the heel side side portions 20 and 22, ridges are formed between the concave portions formed from the heel side toward the toe side. That is, a peak 40 is formed between the heel side recess 34 and the sole side recess 38, and a peak 42 is formed between the sole side recesses 36, 38, and between the toe side recess 32 and the sole side recess 36. A ridge 44 is formed at the top. When the club head 10 is placed on the ground forming the reference plane in a state where a predetermined loft angle is formed between the vertical plane orthogonal to the reference horizontal plane B and the front surface of the face portion 12, the peak portion 42 is A small gap (distance) is formed between the ridges 40 and 44 and the ground.

  Further, as shown in FIG. 5, ridgelines 32a, 34a, 36a, and 38a are formed at the boundaries between the concave portions and the peak portions.

  In this manner, by forming the plurality of recesses 32, 34, 36, and 38 serving as a passage through which air flows from the heel side toward the toe side in the sole portion 18, the toe side, and the heel side side portions 20 and 22, The deformation in the face-back direction of the sole portion 18 at the time of hitting can be reduced, the strength can be improved and stabilized, and air can flow from the heel side to the toe side during the swing before the transition from the top position to the downswing. It becomes easy.

  In particular, in the present embodiment, the maximum depression in each recess is formed in a straight line so as to coincide with the direction along the line X in FIG. 7, thereby reducing the air resistance acting on the head and reducing the head speed. It is possible to suppress the decrease.

  Moreover, it is preferable to form the curved inclined surfaces 34b and 32b centering on the line X in the heel side recessed part 34 and the toe side recessed part 32 at the sole part 18 side. As shown in FIG. 7, the inclined surfaces 32 b and 34 b are configured as curved surfaces that gradually rise toward the center side with the curved bottom lines 32 c and 34 c as lower end edges in each recess.

  By forming the curved inclined surfaces 32b and 34b in this way, air can be guided more smoothly from the heel side to the toe side, and the air flow can be converged and guided. As a result, it becomes easy for the player to raise the club and swing it down, and both the directionality and the flight distance are improved. Further, it is possible to prevent stress concentration on a specific portion, and the strength can be improved and stabilized, and the sole portion 16 can be thinned.

  Further, the direction of the maximum depression (the direction indicated by the line X) is not parallel to the tangent R at the center position C in the toe-heel direction of the face 12 but is separated from the tangent R on the toe side. It is desirable to form as follows.

  As shown in FIGS. 5 and 7, the above-described sole-side recesses 36 and 38 may be formed so that the length dimension along the face-back direction is larger than the width dimension along the toe-heel direction. preferable. In this case, the ratio of the dimension in the toe / heel direction to the dimension in the face / back direction is preferably (2 × toe / heel direction dimension ≦ face / back direction dimension).

  With such a shape, it is possible to prevent the deformation of the sole portion 18 at the time of hitting the ball and to regulate the flow of air up to the impact, effectively reducing the speed of the head due to air resistance. It becomes possible to prevent. That is, in the swing from the downswing position to the impact position, it is possible to create a backward flow path from the leading edge portion 12b of the face portion 12 toward the back portion 24 of the sole portion 18 in the air flow. A stable locus can be easily obtained, and the force acting in the vertical direction on the sole portion 12 can be reduced. Therefore, it is possible to provide a golf club that is easy to swing and has excellent operability over the entire swing from the top position to the hit ball.

  In addition, the direction of the maximum depression along the face-back direction in the sole side recesses 36 and 38 (indicated by the line y) is formed so as to coincide with the traveling direction of the club head 10 at the time of impact. Is preferred.

  With such a shape, strength can be stabilized and the most efficient air flow can be formed along the line Y direction, suppressing the speed reduction due to air resistance as much as possible. It is possible to make an impact. Further, by setting the strength and rigidity at the time of hitting in this direction, high strength and high rigidity (effect of stable hitting sound) can be obtained.

  The sole portion 18 and the concave portion configured as described above can be modified into various forms.

  For example, the toe side recess 32 is preferably formed over the sole portion 12 and the toe side side portion 20, and the heel side recess 34 is preferably formed over the sole portion 12 and the heel side side portion 22.

  In addition, since the sole portion 18 may not be designed to have a recessed middle portion in consideration of contact with the ground or lawn and guideability, all from the heel side to the toe side are as described above. It is not necessary that the recesses are continuous, and a shape having no recesses in part may be used. Specifically, the concave portion can be arbitrarily set, but it is sufficient that at least three in total, one on the heel side, the toe side, and the center are formed. Furthermore, it is preferable to form it on the heel side and the toe side, and form 2 to 4 places in the center so that the total is 6 places or less.

  Further, each of the recesses 32, 34, 36, and 38 is formed on the back portion 24 side from the leading edge along the lower edge portion 12 b of the face portion 12, and ends in front of the rearmost end position on the back side of the sole portion 18. It is preferable. That is, as shown in FIG. 5, the concave portion is formed within a range that defines the outer edge of the back side of the club head 10 when the sole portion 18 is viewed from the lower surface side, and does not extend to the crown portion 16 side. Good.

  Further, as shown in FIG. 4, the back side sole portion 18a which is the rear portion of the sole portion 18 is preferably formed with an inclined portion so as to be gradually inclined upward as it moves to the back side. By forming the inclined portion 18a in this manner, air can be easily flowed to the rear of the sole portion 18. In addition, about the shape which inclines upwards, it may be a shape that rises flush, or may be a shape that rises in a multifaceted (stepwise) manner.

  Furthermore, the surface of the back portion 18 may be formed into a curved shape having an uneven stripe along the toe / heel direction. In this case, it is possible to prevent an increase in air resistance during the swing and to stabilize the movement of the head during the swing in combination with the respective recesses described above.

  The concave portions 32, 34, 36 and 38 as described above are formed in thin portions having an average thickness of 1 mm or less and 0.5 to 0.9 mm, preferably 0.6 to 0.85 mm. By forming the recesses 32, 34, 36, and 38 in such a thin portion, it is possible to reduce the weight while maintaining the strength in the region on the sole side that is the lower region of the crown portion 16 of the club head 10. .

  Specifically, the peak portion 42 between the sole-side recesses 36 and 38 and the region between the sole-side recesses 36 and 38 and the face portion 12 are formed in a thick portion, and the average thickness of the thick portion is determined. Is 0.7 to 1.5 mm. The toe side sole portion 18 and the toe side side portion 20 including the sole side recess 36 are formed as thin portions having an average thickness of 0.6 to 0.9 mm. Further, the heel side sole portion 18 and the heel side side portion 22 including the sole side concave portion 38 are formed in thin portions having an average thickness of about 0.6 to 0.9 mm. The back-side sole portion 18a between the sole-side concave portions 36 and 38 and the above-described weight portion 30 is formed in a thin portion having an average thickness of 0.6 to 1.0 mm.

  In addition, the toe side concave portion 32 and the heel side concave portion 34 can be omitted, and the toe side side portion 20 and the heel side side portion 22 can be formed on curved surfaces that smoothly transition from the peak portions 40 and 44 to the crown portion 16 side. . In this case, the thickness is slightly increased to 0.65 to 0.95 mm.

  As shown in FIGS. 4 to 6, the sole portion 18 of the present embodiment includes a toe side curved rib 46 extending in the face-back direction and having an intermediate region protruding from the toe side to the heel side and overlapping the above-described thin portion. A heel side curved rib 48 extending in the face-back direction and having a central region curved from the heel side to the toe side and overlapping the above-described thin portion is projected from the inner surface of the sole portion 18 into the internal space N. These curved ribs 46 and 48 extend from the face portion 12 to the weight portion 30 on the back side, and force can be transmitted between the face portion 12 and the weight portion 30 via these curved ribs 46 and 48. It is formed as follows.

  In the present embodiment, the middle part of the toe side curved rib 46 overlaps with the sole side recessed part 36, and the middle part of the heel side curved part 48 overlaps with the sole side recessed part 38. Therefore, these curved ribs 46, 48 are formed in the sole side recessed part. 36 and 38 extend in a state crossing the corresponding recesses. These curved ribs 46, 48 extend to the maximum depression along the line y of the sole side recesses 36, 38, that is, the position shifted from the most protruding position in the internal space N to the toe side and the heel side, and the center of gravity G The position of is lowered.

  Further, a lateral rib 50 extending in a state of intersecting with the curved ribs 46 and 48 in the toe-heel direction connecting substantially the center positions along the face-back direction of the sole-side recesses 36 and 38 extends from the inner surface of the sole portion 12 to the internal space N. Protrusively inside. The lateral ribs 50 are formed so as to bend up and down along the concave and convex inner surfaces of the sole side concave portions 36 and 38 and the peak portion 42, the toe side overlaps the inner surface of the toe side concave portion 32, and the heel side is It extends so as to overlap the inner surface of the heel side recess 34. Even when the toe side and heel side recesses 32 and 34 are not provided, the end portions of the lateral ribs 50 are provided on the toe side and heel side side portions in order to reinforce the thin portion and increase the rigidity in the lateral rib direction. It is preferable to extend to the inner surface of 20,22.

  The number of the lateral ribs 50 extending in the toe-heel direction may be, for example, only one extending along the direction of the above-described line X, but is not limited to this. You can also. In this case, instead of the continuous rib structure connecting the side portions 20 and 22, a short rib structure can be combined.

  Such a lateral rib 50 has an average height from the inner surface of the sole portion 12 of 2 to 5 times (preferably, an average thickness of the thin portion) for efficiency of rib weight and rigidity effect and moldability. (2 times to 4 times), specifically, in the range of 1.4 mm to 4.2 mm, preferably about 1.5 mm to 3.5 mm. Also, the average width may be formed in the same dimension as the average height for the rib weight, the efficiency of the rigidity effect and the moldability, but it is preferable to make it smaller than this. In this case, it is preferable that the rib weight has an R shape (with a fillet) so as not to concentrate stress. However, for the strength of the rib base and stability at the time of molding, it is formed at least 1/2 of the average height. Moreover, it is preferable not to make the corner | angular of the upper end of a rib into R shape from a rigid effect.

  On the other hand, it is preferable that the curved ribs 46 and 48 extending in the face-back direction are formed so that both or one of the protruding height and width from the inner surface of the sole portion 12 is larger than the lateral rib 50. The curved ribs 46 and 48 extending in the face-back direction are preferably formed to have a cross-sectional area multiplied by a height and a width larger than that of the lateral rib 50, for example, when the shape is complicated. Thereby, it is possible to prevent the shocking influence by the weight part 30 from acting on the thin part. That is, the inertial force or mass of the weight portion 30 at the time of hitting the ball is reliably transmitted to the face portion 12 through these curved ribs 46 and 48. That is, the rate of consumption as vibration energy of the sole surface can be reduced. At this time, the curved ribs 46 and 48 are separated from each other on the face side and the back side, and are formed in a curved structure in which the intermediate portions are close to each other, thereby acting like a spring and transmitting in a soft manner.

  In addition, when the weight part 30 is very small or when it eliminates, it is good to enlarge the direction of the horizontal rib 50 by making the magnitude | size of an above-mentioned rib into the reverse relationship. It is also possible to eliminate the curved rib.

  Furthermore, face side ribs 52 that protrude from the inner surface into the internal space N are provided on the face portion 12 that receives force from the curved ribs 46 and 48.

  The face side rib 52 of this embodiment extends linearly in the toe-heel direction with a space between the lower edge portion 12 b and protrudes from the inner surface of the face portion 12 into the internal space N. Between the face side rib 52 and the sole portion 12, an auxiliary rib 54 projects from the inner surface of the face portion 12 to the back side. The auxiliary ribs 54 may be provided at one to four positions along the toe / heel direction. For example, as shown in FIG. 5, in the case where it is provided at the central portion, the face side rib 52 is formed at the thick portion of the sole portion 12 by projecting toward the back side from the face side rib 52 extending in the toe / heel direction. It can be integrated into a certain ridge 42.

  The face-side rib 52 extends over an area of approximately 50 to 80% of the area forming the hitting surface of the face portion 12, continues to the front end of the toe-side curved rib 46 at the toe-side end, and heels at the heel-side end. It continues to the front end of the side curved rib 48. Thereby, the strength of the hitting surface can be improved, and mass transmission at the time of hitting can be reliably performed. A plurality of face-side ribs 52 can be provided, but only one may be used as long as the mass of the weight part 30 can be reliably transmitted to the face part 12.

The curved ribs 46 and 48 extending between the face-side rib 52 and the weight portion 30 are continuous with the face-side rib 52 and the weight portion 30, that is, by making the surfaces defining the height and width continuous. Although it is possible to integrate the weight portion 30, the weight portion 30 may be discontinuous with respect to the face side rib 52 and the weight portion 30 as long as the weight portion 30 can be reliably transmitted to the face portion 12. Good. By making it non-continuous, weight reduction can be achieved. In this case, it is preferable to form a non-continuous part thickly between them, or to arrange an auxiliary rib (not shown). Moreover, you may utilize the "concave letter" and "groove" on a design instead of an auxiliary rib. (Normally, the inner surfaces of “characters” and “grooves” are convex)
The curved ribs 46 and 48 are connected to the toe side and heel side ends of the weight member 30 on the back side, and on the face side, the toe side of the face side rib 52 extending over a wide range of the hitting surface and By connecting to the heel side end portion, even if the hit point position varies, the weight portion 30 is reliably transmitted to the face portion 12, and the intermediate portion overlapping the thin portion reinforces this thin portion, Prevents sound cracking and improves the sound quality of thin parts.

  Thus, the formed club head 10 is reduced in weight by the thin portion provided in the sole portion 18, and the toe side curved rib 46 and the heel side curved rib 48 in which the intermediate portion overlaps the thin portion. The thin-walled portion is reinforced, and the curved toe-side curved rib 46 and heel-side curved rib 48 can transmit the mass of the weight portion 30 to the face portion 12 in a soft manner, so that the hitting sound and the shot feeling are soft. Furthermore, even if the hit points vary, a golf ball having an approximate hitting sound and hitting feeling, which improves the strength of the sole portion 18 while reducing the thickness and weight, and has an excellent hitting feeling. I will provide a.

  Further, when the toe side curved rib 46 and the heel side curved rib 48 of the sole portion 18 extend across the concave portions formed in the thin portion, that is, the sole side concave portions 36 and 38 and the side portions 20 and 22. Due to the curved shape of the sole side recesses 36 and 38 and the reinforcing effect by the curved ribs 46 and 48, deformation of the sole portion 18 at the time of hitting the ball is prevented, and the mass of the weight portion 30 of the back portion 24 is reliably applied to the face portion 12. Can communicate.

  Further, when the face side rib 52 and the auxiliary rib 54 are formed on the inner surface of the face portion 12, and the toe side curved rib 46 and the heel side curved rib 48 are integrally connected to the end of the face side rib 52, respectively. In this case, the weight portion 30 of the back portion 24 can be reliably connected to the sole side portion of the face portion 12 so that the hit ball can fly higher and further away.

  In the above-described embodiment, except for the auxiliary rib 54, the protruding heights of the curved ribs 46, 48, the lateral rib 50, and the face side rib 52 into the internal space N are formed to be substantially constant. For example, it is possible to change the thickness according to the thickness of each part forming the outer shell.

1 is an overall view of a golf club provided with a golf club head according to a preferred embodiment of the present invention. FIG. 2 is a schematic plan view of the club head of FIG. 1. FIG. 2 is a schematic front view of the club head of FIG. 1. Sectional drawing which follows the IV-IV line | wire of FIG. FIG. 3 is a partial sectional view of the club head of FIG. Sectional drawing which follows the VI-VI line of FIG. FIG. 3 is a bottom view of the club head of FIG. 2.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Club head, 10a ... Head main body, 12 ... Face part, 16 ... Crown part, 18 ... Sole part, 20, 22 ... Side part, 24 ... Back part, 30 ... Weight part, 36, 38 ... Sole side recessed part ( Thin portion), 46 ... toe side curved ribs, 48 ... heel side curved ribs, N ... internal space.

Claims (2)

An outer shell is formed by the face portion, the crown portion, the sole portion, the toe side and heel side side portions, and the back portion of the rear portion, in which the ball hitting surface of the golf ball is formed on the front surface. A golf club comprising a hollow metal club head formed of
A weight portion is provided on the back portion, a thin portion having a thickness of less than 1 mm is provided on the sole portion, extends in a face-back direction from a position separated from the inner surface of the face portion, and an intermediate region projects from the toe side to the heel side. A toe-side curved rib that overlaps the thin-walled portion, and a heel-side curved rib that extends in the face-back direction from a position separated from the inner surface of the face portion and protrudes toward the toe side with a central region protruding to the toe-side. A golf club characterized by protruding from the inner surface of the golf club into the internal space.   A concave portion that is longer in the face / back direction than the toe / heel direction and that is recessed into the inner space side is formed in the thin-walled thick portion, and the toe side curved rib and the heel side curved rib cross the corresponding concave portions, respectively. The golf club according to claim 1, wherein the golf club extends.

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