JP3936887B2 - Golf club head and golf club having the head - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a golf club head having a metal shell structure and a golf club including the golf club head.
[0002]
[Prior art]
It is desired to provide a so-called wood-type golf club head that can always be hit with a sweet spot, has a good directivity, can achieve straight flight without slicing or hooking, and can extend the flight distance.
[0003]
In order to meet this demand, the present applicant has proposed a golf club head having a metal shell structure in Japanese Patent No. 2831585. This golf club head has a recess extending in the front-rear direction that extends rearward from a position spaced from the face surface and is open to the back face surface at the center in the width direction of the sole surface.
[0004]
[Problems to be solved by the invention]
The present invention relates to an improvement of the golf club head according to the above proposal.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a golf club head capable of ensuring a wide sweet spot and suppressing the center of gravity to be low, thereby increasing the straightness of the hit ball and increasing the flight distance, and a golf club equipped with the head. There is to do.
[0006]
Another object of the present invention is to provide a golf club head and head capable of further reducing grounding resistance and guiding the head straight in the direction of the ball even when the sole surface of the head is grounded during the swing process. It is to provide a golf club having
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, a golf club head having a metal shell structure,
A sole surface formed in a gentle downward projecting arc shape from the heel to the toe,
A downwardly bulging portion of a substantially rectangular shape having a predetermined width and extending rearward from the face surface in an intermediate region between the heel and the toe on the sole surface;
A recess extending in parallel with a substantially constant width rearward from a position away from the face surface by a predetermined distance at the center in the width direction of the bulging portion, and having a recess opened at the back face surface, By forming the recess in the bulge portion, a pair of bulge rail portions parallel to both sides of the recess are formed.
[0008]
According to this invention, the center of gravity depth is increased by the weight of the shell walls on both sides sandwiching the recess, and the sweet spot is widened. Therefore, the probability of hitting at the sweet spot is improved, and a straight trajectory with good directionality can be realized. Further, the downward bulge formed on the sole surface can provide a low center of gravity, realizing a high trajectory and increasing the flight distance. Furthermore, due to the presence of a pair of parallel bulging rails formed on both sides of the recess, even when the sole surface of the head is grounded during the swing process, the grounding resistance is further reduced and the head is straightened in the direction of the ball. Can be guided to.
[0009]
In the case where a straight guide groove is formed at the center in the width direction of each of the bulging rail portions, the straight guide groove further enhances the straightness in the hitting direction described above, and makes the swing more stable. Can be realized.
[0010]
The bulging portion is preferably formed in a region of about ½ to about ¼ of the length from the heel to the toe.
[0011]
As for the said recess, it is desirable for the front-end | tip part by the side of the said face to be formed in the semicircular arc shape.
[0012]
The recess preferably includes a parallel front parallel portion having a substantially constant width, and a rear opening portion that is connected to the front parallel portion and gradually increases in width toward the rear and is opened at the back face surface. .
[0013]
The recess has a longitudinal length of the front parallel part in the range of 10 to 40 mm, particularly in the range of 20 to 35 mm, the width of the parallel part in the range of 8 to 20 mm, particularly in the range of 10 to 15 mm, and the depth. It is desirable that the distance is set in the range of 3 mm to ½ of the head height, particularly in the range of 5 to 15 mm.
[0014]
According to another aspect of the present invention, a golf club including a golf club head,
The golf club head is
A sole surface formed in a gentle downward projecting arc shape from the heel to the toe,
A downwardly bulging portion of a substantially rectangular shape having a predetermined width and extending rearward from the face surface in an intermediate region between the heel and the toe on the sole surface;
A recess extending in parallel with a substantially constant width rearward from a position a predetermined distance rearward from the face surface at the center in the width direction of the bulging portion, and having a recess opened at the back face surface;
By forming the recess in the bulging portion, a pair of bulging rail portions parallel to both sides of the recess are formed.
[0015]
Other objects and features of the present invention will become more apparent from the following description with reference to the accompanying drawings.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the present invention will be described with reference to the drawings.
[0017]
The wood type golf club head (1) shown in FIGS. 1 to 7 is of a type called a so-called metal wood. Reference numeral (2) is a metal head shell, and (3) is a filler. The head shell (2) is a molded product made of a metal such as stainless steel, aluminum, titanium, or magnesium. The filler (3) is made of a material having a specific gravity smaller than that of the shell (2), for example, a foamed resin material such as hard urethane foam, and is filled and arranged in the shell (2) by a conventional method. Yes.
[0018]
In particular, as clearly shown in FIG. 6, the sole surface (4) of the golf club head (1) is formed in a gentle downward protruding arc shape from the heel (5) to the toe (6). As shown in FIG. 2, the width direction intermediate region of the sole surface (4), that is, the intermediate region between the heel (5) and the toe (6) is rearward from the face surface (7). That is, a substantially rectangular downward bulging portion (9) having a predetermined width is formed toward the back face surface (8).
[0019]
Due to the presence of the downward bulging portion (9), the head (1) has a low center of gravity structure, and as a result, a high trajectory is realized and the flight distance can be extended. In addition, even when the sole surface (4) is grounded during the swing, the ground contact area can be reduced due to the presence of the downward bulging portion (9) coupled with the shape of the sole surface (4) described above. . Therefore, the head swing-out performance can be improved regardless of the grounding due to a miss shot or the intentional grounding. The bulging portion (9) is formed in a region of about ½ to about ¼ of the length from the heel (5) to the toe (6). This is because the effects described below cannot be sufficiently achieved if the value is too larger than the upper limit value or conversely too smaller than the lower limit value.
[0020]
By the way, if the depth of the center of gravity, which is the distance from the face (7) to the center of gravity, is increased, the sweet spot is widened accordingly. In order to take advantage of this property, in the club head according to this embodiment, the back face extends in the center in the width direction of the sole surface (4) from the position spaced rearward from the back surface of the face constituting shell wall (7). A recess (10) extending in the front-rear direction opened on the surface (8) is provided.
[0021]
That is, in the central portion in the width direction of the downward bulging portion (9), the back face surface (8) extends in parallel with a substantially constant width from the position rearwardly spaced from the face surface (7) toward the rear. The recess (10) opened at (1) is formed. As clearly shown in FIG. 4, the recess (10) extends rearward from a position spaced rearward from the rear surface of the shell wall constituting the face (7), and is formed on the back face surface (8). It is open. The front side is a parallel portion (11) having a constant width or a substantially constant width, and the rear side is connected to the parallel portion (11), and the width is gradually increased toward the rear side to the back face surface (8). An open rear opening (12) is provided. The parallel part (11) has a tip end on the face side formed in a semicircular arc shape, and a bottom surface formed in an arcuate cross section as shown in FIG.
[0022]
Thus, by forming the recess (10) in the downward bulging portion (9), a pair of bulging rails (9a) (9a) parallel to both sides of the recess (10) is formed. ing.
[0023]
In the metal wood head (1) having a metal shell structure, the recess (10) is formed in the downward bulging portion (9) as described above, so that the recess (10) is held as shown in FIG. Rising metal shell walls (13) (13) are formed on both sides. The weight of these shell walls (13) and (13) increases the depth of the center of gravity of the head (1) and realizes a structure with a low center of gravity.
[0024]
In the head (1), the front and rear of the head portion (4) that extend rearward from a position spaced rearward from the back surface of the face-constituting shell wall (7) and opened to the back face surface (7) Since the recess (10) extending in the direction is provided, as described above, as shown in FIG. 7, the shell walls (13) (13) on both sides of the recess (10) are sandwiched. The center of gravity of the head (1) is deepened by the weight, and the sweet spot is widened. As a result, the hit probability at the sweet spot is increased, and a straight flight with good directionality and no slice or hook can be realized.
[0025]
Moreover, the center of gravity of the head (1) becomes lower due to the presence of the shell walls (13) and (13) on both sides of the recess (10) and the presence of the downward bulging portion (9). As a result, a higher trajectory can be realized and the flight distance can be extended.
[0026]
In particular, the recess (10) has a rear opening (12) whose width is gradually increased toward the rear on the rear side thereof, so that the shell walls (13) on both sides sandwiching such an opening (12) are provided. By the weight of (13), the depth of the center of gravity can be deepened more effectively and the center of gravity can be lowered.
[0027]
In particular, the recess (10) is formed in the parallel portion (11) on the front side which is the face surface (7) side, so that the shell walls (13) on both sides sandwiching the parallel portion (11) are formed. (13) faces in the front-rear direction. Therefore, the shell walls (13) and (13) on both sides transmit energy intensively and explosively to the ball at the moment of hitting the ball, so that a so-called hammer effect is produced and a further increase in flight distance can be realized. . In addition, both side walls (13) and (13) sandwiching the parallel portion (11) are spaced apart from each other, and are present at positions spaced from the back surface of the face-constituting shell wall (7). Therefore, the ball muscle does not become unstable.
[0028]
Further, the sole surface (4) is formed in a gentle downward projecting arc shape from the heel (5) to the toe (6), and a downward bulging portion (9) is formed on the sole surface (4). The bulging portion (9) is provided with a recess (10) opened to the back face surface (8), and the bulging portion (9) has a pair of bulging rail portions (9a) (9a) in parallel. It has been. Therefore, even when the sole surface (4) is grounded during the swing, the head ground contact area is reduced due to the downward projecting arc shape of the sole surface (4), the presence of the downward bulging portion (9), and the presence of the recess (10). The swing-out performance is good due to the low resistance at the time of swing-out due to the decrease and the rear opening of the recess. Moreover, since the recess (10) has the parallel part (11), when the sole surface (4) is grounded in the swing process, the recess parallel part (11) guides the head (1) straight. Acts like Therefore, even when the sole surface (4) is grounded during the swing process in this way, the ball can be thrown with good directivity and the flying distance can be increased. This action is further promoted by the pair of parallel bulging rail portions (9a) (9a) of the downward bulging portion (9), and further increases the straightness in the hitting direction and the stability of the shot.
[0029]
In addition, the recess (10) is formed in the rear opening (12) whose rear side is connected to the parallel portion (11) and is gradually increased in width, so that the intensive swing can be smoothly performed and advanced. You can smoothly achieve exquisite shots using golf techniques.
[0030]
As for the said downward bulging part (9), it is desirable for the protrusion height h (refer FIG. 7) from a sole surface (4) to be set to the range of 1-5 mm. That is, if the protrusion height h is less than 1 mm, the effect of reducing the grounding resistance when the head contacts the ground during swing cannot be expected so much. Conversely, if it exceeds 5 mm, the center of gravity increases and the high ballistic effect due to the low center of gravity decreases. A tendency tends to appear, and a tendency to deteriorate the ground contact stability at the time of stance appears, and further, a change in loft and an unstable setting are likely to occur. For this reason, the protruding height h of the downward bulging portion (9) from the sole surface (4) is particularly preferably set in the range of 1.5 to 4 mm.
[0031]
In the recess (10), the length L (see FIG. 4) of the front parallel part (11) in the front-rear direction is 10 to 40 mm, and the width W (see FIG. 4) of the parallel part (11) is 8 to 20 mm. And the depth D (see FIG. 7) are preferably set in the range of 3 mm to ½ of the head height H, respectively.
[0032]
That is, when the length L of the parallel portion (11) of the recess (10) becomes smaller than 10 mm, the hammer effect tends to become dull. In addition, when the length L of the parallel portion (11) exceeds 40 mm, the opening portion becomes narrower in the front-rear direction, and the intentional swinging tends to be difficult. For this reason, the length L of the recess parallel part is preferably set in the range of 20 to 35 mm.
[0033]
When the width W of the parallel portion (11) is smaller than 8 mm, there is a high possibility that an inconvenience such as clogging of objects in the parallel portion will occur, and the instability of the ball muscle at the time of hitting by the hammer effect tends to increase. Becomes easier to appear. In addition, when the width W of the parallel portion increases beyond 20 mm, the shell wall on the bottom surface of the parallel portion increases correspondingly, which tends to increase the position of the center of gravity and reduce the high ballistic effect due to the low center of gravity. In addition, there is a tendency that the grounding stability at the time of stance deteriorates, and further, the change of loft and the instability of setting are likely to be caused. For this reason, the width W of the recess parallel part (11) is particularly preferably set in the range of 10 to 15 mm.
[0034]
Moreover, if the depth D of the parallel part (11) becomes smaller than 3 mm, the effect of increasing the weight of the side walls (13) and (13) sandwiching the recess (10) becomes insufficient, resulting in an increase in the depth of the center of gravity. There is a tendency that the sweet spot becomes wider and the low center of gravity effect is less likely to appear. Further, when the depth D of the recess (10) becomes larger than 1/2 of the head height H, this also tends to make the low center of gravity effect less likely to appear. For this reason, the depth D of the parallel portion (11) of the recess (10) is particularly preferably set in the range of 5 to 15 mm.
[0035]
Further, each bulging rail portion (9a) (9a) has a width so as to further promote the operational effect of the recess (10) and the operational effect of the pair of parallel bulging rail portions (9a). A guide groove (15) is formed straight along the front-rear direction over the substantially entire length of the bulging rail portion (9a) at the center in the direction. In order to exert the effect of the guide groove (15), it is desirable to set the width in the range of 1.5 to 3.0 mm and the depth in the range of 0.5 to 2.0 mm. The guide groove (15) further promotes the lowering of the center of gravity of the head (1), the reduction of grounding resistance, and the straight-line inductivity of the head in the direction of hitting the ball when swinging. In addition, in order to improve swing-out performance, the guide groove (15) is a rear opening portion whose rear end portion is opened to the back face surface (8), similar to the recess (10). There may be.
[0036]
In this embodiment, in order to realize an optimum head structure, the protrusion height h from the sole surface (4) of the downward bulging portion (9) is 2.5 mm, and the recess (10) has a depth D. The parallel portion (11) has a width W of about 13 mm, the parallel portion (11) has a length L of about 30 mm, and the guide groove (15) has a width of 2.0 mm and a depth of 1.5 mm. Yes.
[0037]
FIG. 8 shows a golf club provided with the golf club head (1). Reference numeral (20) is a shaft, and (21) is a grip.
[0038]
The terms and explanations used here are used to describe one embodiment of the present invention, and the present invention is not limited to this. The present invention allows any design changes within the scope of the claimed invention without departing from the spirit thereof.
[0039]
【The invention's effect】
According to this invention, the center of gravity depth is increased by the weight of the shell walls on both sides sandwiching the recess, and the sweet spot is widened. Therefore, the probability of hitting at the sweet spot is improved, and a straight trajectory with good directionality can be realized. Further, the downward bulge formed on the sole surface can provide a low center of gravity, realizing a high trajectory and increasing the flight distance. Furthermore, due to the presence of a pair of parallel bulging rails formed on both sides of the recess, even when the sole surface of the head is grounded during the swing process, the grounding resistance is further reduced and the head is straightened in the direction of the ball. Can be guided to.
[0040]
In the case where a straight guide groove is formed at the center in the width direction of each of the bulging rail portions, the straight guide groove further enhances the straightness in the hitting direction described above, and makes the swing more stable. Can be realized.
[Brief description of the drawings]
FIG. 1 is a perspective view of a golf club head according to an embodiment of the present invention.
FIG. 2 is a perspective view of the golf club head as viewed obliquely from the front and lower side.
FIG. 3 is a perspective view of the golf club head as viewed from behind and below.
FIG. 4 is a bottom view of the golf club head.
FIG. 5 is a side view of the golf club head as viewed from the heel side.
FIG. 6 is a front view of the golf club head.
7 is a cross-sectional view taken along line 7-7 of FIG.
FIG. 8 is a golf club provided with the golf club head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Golf club head 2 ... Head shell 3 ... Filler 4 ... Sole surface 5 ... Heel 6 ... Toe 7 ... Face surface 8 ... Back face surface 9 ... The bulging part 10 ... Recess 11 ... Parallel part 12 ... Back opening part 13 … Ciel wall

Claims (12)

A golf club head having a metal shell structure,
A sole surface formed in a gentle downward projecting arc shape from the heel to the toe,
A downwardly bulging portion of a substantially rectangular shape having a predetermined width and extending rearward from the face surface in an intermediate region between the heel and the toe on the sole surface;
A recess extending in parallel with a substantially constant width rearward from a position a predetermined distance rearward from the face surface at the center in the width direction of the bulging portion, and having a recess opened at the back face surface;
A golf club head according to claim 1, wherein a pair of bulge rail portions parallel to both sides of the recess is formed by forming the recess in the bulge portion. The golf club head according to claim 1, wherein each of the bulging rail portions is formed with a straight guide groove at a center portion in the width direction. The golf club head according to claim 1, wherein the bulging portion is formed in a region of about ½ to about ¼ of a length from the heel to the toe. The golf club head according to claim 1, wherein the recess has a semicircular arc-shaped tip on the face side. The recess includes a parallel front parallel part having a substantially constant width, and a rear opening part connected to the front parallel part and gradually widened toward the rear and opened at the back face surface. The golf club head described in 1. The recess is set in a range in which the front parallel portion has a length in the front-rear direction of 10 to 40 mm, a width of the parallel portion in the range of 8 to 20 mm, and a depth in the range of 3 mm to 1/2 of the head height. A golf club head according to claim 1. The golf club head according to claim 6, wherein the front parallel portion of the recess has a longitudinal length set in a range of 20 to 35 mm. The golf club head according to claim 6, wherein the width of the front parallel portion of the recess is set in a range of 10 to 15 mm. The golf club head according to claim 6, wherein the recess has a depth set in a range of 5 to 15 mm. The golf club head according to claim 2, wherein the guide groove has a width set in a range of 1.5 mm to 3.0 mm and a depth set in a range of 0.5 mm to 2.0 mm. A golf club head having a metal shell structure,
A sole surface formed in a gentle downward projecting arc shape from the heel to the toe,
A substantially rectangular downward bulging portion having a predetermined width, which is formed in an intermediate region between the heel and the toe on the sole surface and extends rearward from the face surface;
A recess extending in parallel with a substantially constant width rearward from a position a predetermined distance rearward from the face surface at the center in the width direction of the bulging portion, and having a recess opened at the back face surface;
By forming the recess in the bulge portion, a pair of bulge rail portions parallel to both sides of the recess is formed,
A guide groove is formed in the front-rear direction at the center in the width direction of each bulge rail portion,
The bulging portion is formed in a region of about ½ to about ¼ of the length from the heel to the toe,
The recess has a parallel front parallel portion having a substantially constant width, and a rear opening portion connected to the front parallel portion and gradually widened toward the rear and opened at the back face surface,
The recess is set in a range in which the front parallel portion has a length in the front-rear direction of 10 to 40 mm, a width of the parallel portion in the range of 8 to 20 mm, and a depth in the range of 3 mm to ½ of the head height. ,
2. The golf club head according to claim 1, wherein the guide groove has a width of 1.5 to 3.0 mm and a depth of 0.5 to 2.0 mm. A golf club with a golf club head,
The golf club head is
A sole surface formed in a gentle downward projecting arc shape from the heel to the toe,
A downwardly bulging portion of a substantially rectangular shape having a predetermined width and extending rearward from the face surface in an intermediate region between the heel and the toe on the sole surface;
A recess extending in parallel with a substantially constant width rearward from a position a predetermined distance rearward from the face surface at the center in the width direction of the bulging portion, and having a recess opened at the back face surface;
A golf club characterized in that a pair of bulging rail portions parallel to both sides of the recess are formed by forming the recess in the bulging portion.

Images