JP2001046560A - Iron type golf club - Google Patents

Abstract

(57) [Problem] To provide an iron-type golf club capable of lowering the depth of the center of gravity. A shaft (3) is connected to a head body (8) having a face (4) formed on a front surface, a sole (7) formed on a lower portion, and a cavity (9) formed on a rear surface. A through hole 10 is provided to connect the sole 7 and the lower surface 9A of the cavity 9. A hollow portion is formed by the through hole 10 in the lower rear portion of the head 1, that is, between the sole 7 and the lower surface 9A of the cavity 9.
The center of gravity of the head 1 can be arranged rearward. Also,
By providing the plate member 12 on the same plane as the sole 7,
The sole 7 does not catch on the green at the time of hitting, and can swing smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an iron type golf club.

[0002]

Generally, golf clubs comprise a head and a shaft connected to the head body, and are roughly classified into an iron type, a wood type and a putter type.
The head of the iron type golf club is roughly classified into a muscle type in which a rear surface of a metal head body is formed substantially flat, and a cavity type in which a concave portion is formed in the rear surface. The cavity-shaped golf club head has the advantage that the weight distribution of the head can be freely set by the cavity formed so as to be cut out.

[0003] By the way, even a golfer whose head has a relatively low speed can use a club having a low center of gravity of the head and a rear center of gravity in order to achieve a certain flight distance. If the position of the center of gravity is low in the head and the center of gravity is located rearward, the hit ball is likely to rise and backspin is likely to occur, thereby extending the carry. In the case of iron clubs, the directionality is particularly emphasized, and the above-mentioned cavity type is generally used in order to reduce the bending of the hit ball even in an off-center hit. This is because, in the head of the cavity-type iron-type golf club, the center portion is reduced in weight, and the portion is redistributed to the periphery of the head to increase the moment of inertia and to reduce blur.

However, the peripheral weight distribution of such a cavity type head does not always make the position of the center of gravity low and deep. In this regard, a wood-type head such as a driver has a wide sole and the head itself has a depth, so that it is easy to devise a method of reducing the depth of the center of gravity. However, an iron-type head has a relatively flat shape and is hard to lower the depth of the center of gravity.

In addition, the sectional shape of the iron type head is
The sole shape is thicker on the face side and becomes thinner toward the rear. For this reason, in order to lower the depth of the center of gravity without changing the overall weight of the head, it is necessary to reduce the weight of the sole on the face side and redistribute that amount to the rear of the sole.

Accordingly, an object of the present invention is to provide an iron-type golf club that can lower the depth of the center of gravity, that is, lower the position of the center of gravity and deepen the position of the center of gravity.

[0007]

According to the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed at a front surface, a sole formed at a lower portion, and a cavity formed at a rear surface. An iron-type golf club, characterized in that a through-hole is provided to connect the lower surface of the cavity and the lower surface of the cavity, and a plate-shaped member is provided so as to close the sole side of the through-hole.

According to the structure of the first aspect, the weight can be distributed to other parts by the through holes.

A second aspect of the present invention is an iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface. And the height of the weight in the vertical direction is 3.0 mm higher than the portion formed by the surface of the head body cavity on the sole side and the surface of the weight in the cavity direction when the face is vertically arranged. An iron-type golf club characterized by being formed as described above.

According to the configuration of the second aspect, the depth of the center of gravity of the head can be reduced by the weight.

According to a third aspect of the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface, wherein a groove is provided on the sole. The groove should be at least 2.0 mm deeper than the surface drawn smoothly from the leading edge to the trading edge,
The groove is formed to have a length of 80% or more of the sole surface.

According to the structure of the third aspect, the weight of the portion can be reduced by the groove formed in the sole, and the weight can be distributed to other portions.

According to a fourth aspect of the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface. Alternatively, there is provided an iron-type golf club in which a through hole is formed, and a lightweight member having a lower specific gravity than the head body is provided in the concave portion or the through hole.

According to the structure of the fourth aspect, by providing the lightweight member having a smaller specific gravity than the head body on the sole side, the weight generated by the specific gravity difference can be distributed to other parts.

According to a fifth aspect of the present invention, the distance from the face to the highest part of the sole in the vertical direction with respect to the face is 20 mm or more. It is an iron type golf club described in the paragraph.

According to the fifth aspect of the present invention, the highest point of the sole, that is, the portion farthest from the face can be separated from the face as much as possible to lower the depth of the center of gravity.

According to a sixth aspect of the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface. An iron-type golf club wherein a weight having a higher specific gravity than a metal forming the head body is arranged.

According to this configuration, a weight having a higher specific gravity than the metal forming the head main body is disposed behind the sole side of the cavity, so that the depth of the center of gravity can be reduced.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG. In the iron-type golf club, a shaft 3 is connected to a hosel 2 which is a shaft mounting portion formed on one side of the head 1. Head 1
Is made of steel in which the face 4 is formed on the front surface, the hosel 2 is formed on one side, that is, the upper part of the heel 1A on the base side, the toe 1B is formed on the other side, that is, the tip side, and the sole 7 is formed on the lower surface. Has a head main body 8 formed by forging. Both ends of the sole 7 are smoothly connected to the front and rear, that is, the trading edge 5 and the leading edge 6, respectively, and the cavity 9 is formed by forming the rear surface of the head 1 in a concave shape. This cavity 9 has a lower surface 9A,
It has an upper surface 9B, left and right side surfaces 9C and a front surface 9D,
The lower surface 9A, the upper surface 9B, and the right and left side surfaces 9C are formed along the outline substantially inside the outline of the head main body 8. The thickness A of the sole 7 and the lower surface 9A is formed so as to gradually decrease toward the rear.

Further, a through hole 10 is formed so as to connect the sole 7 and the lower surface 9A. The through-hole 10 is formed by cutting to have a width extending from the side of the trading edge 5 to the side of the leading edge 6 and to be elongated from the heel 1A to the toe 1B. The through-hole 10 has a front-rear width B substantially the same, and a shallow groove 11 having a front-rear width C larger than the front-rear width B at its lower end.
Is formed (B <C). The front and rear ends of this groove 11 are through holes 10
The plate member 12 is fixed to the groove 11 so as to close the through hole 10 and to be flush with the sole 7. The plate-shaped member 12 is made of the same material as the head body 8, for example, S20C, or a material having a specific gravity greater than that of the head body 8, for example, beryllium copper alloy. Then, the plate-like member 12
Is preferably 5 mm or less, preferably 2 mm or less. The rearward projection of the sole 7 has a distance E of 20 m from the face 4 to the highest portion of the sole 7 in the vertical direction with respect to the face 4.
m or more. The peripheral surface 11A of the groove 11 is formed in an inversely tapered shape so as to expand upward, and the peripheral surface of the plate member 12 is plastically deformed and fixed by press-fitting the plate member 12 into the groove 11. is there.

In the figure, reference numeral 13 denotes a lateral groove called a score line or the like formed on the face 4, and the fixing of the plate member 12 to the groove 11 may be performed by welding or the like in addition to the press-fitting.

As described above, in the above embodiment, in the iron type golf club in which the shaft 3 is connected to the head body 8 having the face 4 formed on the front surface, the sole 7 formed on the lower portion, and the cavity 9 formed on the rear surface. Sole 7
By providing a through-hole 10 connecting the lower surface 9A of the cavity 9 to the lower side of the head 1, that is, between the sole 7 and the lower surface 9A of the cavity 9, a hollow portion is formed by the through-hole 10. As a result, the center of gravity of the head 1 can be arranged rearward. In addition, since the plate-like member 12 is provided in the lower part of the through-hole 10 on the same plane as the sole 7, the sole 7 can be smoothly swung without hitting the green (ground) when hitting a ball. .

Moreover, the through hole 10 has a width extending from the trading edge 5 side to the leading edge 6 side by cutting.
Since the heel 1A extends from the heel 1A to the toe 1B, the lower rear portion of the face 4 is in an open state. Therefore, the degree of freedom of the lower rear portion of the face 4 at the time of hitting the ball is increased, the ball is easily elastically deformed, and the flight distance is extended. be able to. Furthermore, the formation of the through hole 10 allows the weight of the sole 7 to extend rearward, and the protrusion of the sole 7 extends vertically from the face 4 with respect to the face 4. Distance E to the highest part is 20
mm or more, the center of gravity of the head 1 can be further arranged rearward. The distance E is 20 m
If it is less than m, it is somewhat difficult to arrange the center of gravity of the head 1 behind.

Hereinafter, another embodiment of the present invention will be described.
The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 4 and 5 show a second embodiment of the present invention, in which a sole 7 of a head body 8 and a lower surface 9 of a cavity 9 are shown.
A rear portion between the head body 8 and the head body 8 is formed so as to be cut out, and a weight 21 separate from the head main body 8 is provided at the rear portion of the portion. The head body 8 and the weight 21 are formed by, for example, S20C. The lower surface 9A of the cavity 9 is formed in a substantially flat shape, and the front surface 21A of the weight 21, which has a sole rear portion 7B continuous with a curved surface formed on the sole front portion 7A of the head main body 8, is inclined obliquely upward. It is inclined backward. A rear portion between the front portion 7A of the sole and the lower surface 9A of the cavity 9 and a rear portion between the lower portion of the front surface 21A and the rear portion of the lower portion of the front surface 21A, which are inclined obliquely rearward upward, are surface-joined. Side protrusion 22
A is fixed by a horizontally long dovetail groove 22 press-fitted into a concave portion 22B on the sole front portion 7A side. Further, the weight 21 has a width extending from the trading edge 5 to the leading edge 6 of the head main body 8 and extends horizontally from the heel 1A to the toe 1B.

When the face 4 is vertically arranged, the weight 21 is provided on the surface of the cavity 9 of the head body 8 on the sole front portion 7A side, that is, the lower surface 9A, and the weight 21
Surface in the direction of the cavity 9, ie, the front surface 21A of the weight 21
The height F of the highest position in the vertical direction of the weight 21 is formed to be 3.0 mm or more than the part formed by the weight 21.

The distance E from the face 4 to the highest or farthest part of the sole rear portion 7B from the face 4 is formed to be 20 mm or more.
In this embodiment, the head body 8 and the weight 21 are connected to the dovetail groove 22.
However, fixing means such as welding may be used.

Therefore, in the above embodiment, the rear portion of the sole 7 is formed by a separate weight 21, and when the face 21 is arranged vertically, the surface of the cavity 9 of the head body 8 on the side of the sole front portion 7A and the weight 21 By making the height F in the vertical direction of the weight 21 larger than the portion formed by the surface of the cavity 21 in the direction of the cavity 9, the cavity 9 is in a so-called undercut state, and the center of gravity of the head 1 is lowered and further deepened. A head 1 having a wide area can be provided. Further, by forming the height F to be 3.0 mm or more, the undercut state of the cavity 9 can be ensured, and the center of gravity of the head 1 can be further lowered and deepened.

Further, in the above embodiment, the weight 21 having the sole rear portion 7B continuous with the sole front portion 7A and being separate from the head main body 8 is fixed to the head main body 8 having the sole front portion 7A. The undercut cavity 9 can be easily formed.

FIGS. 6 and 7 show a third embodiment of the present invention. The head body 8 is made of S20C or the like in which the face 4, the sole 7 and the like are formed.
The groove 31 is formed by cutting or the like. The cross section of the groove 31 is cut out in an arc shape. The width of the groove 31 from the trading edge 5 to the leading edge 6 of the sole 7 is taken from the heel 1A side to the toe. The width G is formed to be 30% or more of the width G 'of the sole 7 drawn smoothly (0.3G'<G). Further, the length is formed to be 80% or more of the sole 7 from the heel 1A side to the toe 1B side. Further, the depth H of the groove 31 is set at the leading edge 6.
From the edge of the sole 7 drawn smoothly from the edge to the trading edge 5 to a depth of 2.0 mm or more. Further, with reference to the face 4, the face 4
From the vertical to the highest point of the sole 7 is 20
mm or more.

As described above, in the above embodiment, the groove 31 is formed from the trading edge 5 to the leading edge 6 of the sole 7 and from the heel 1A to the toe 1B, so that the weight of the missing groove 31 can be reduced, for example. The rear portion of the sole 7 can be distributed so as to extend rearward, so that the center of gravity of the head 1 can be low and deep. Moreover, by forming the groove at the deepest portion of the groove 31 at a depth of 2.0 mm or more from the surface of the sole 7, the weight can be sufficiently reduced, and the portion is distributed so that the rear portion of the sole 7 extends rearward. As a result, the center of gravity of the head 1 can be reliably set low and deep.

The groove 31 is formed horizontally from the heel 1A to the toe 1B with the width extending in the direction from the trading edge 5 to the leading edge 6 so that the head 1
Since the weight reduction by the groove 31 can be obtained uniformly, the balance of the head 1 can also be ensured.

In the fourth embodiment shown in FIGS. 8 to 9, the sole 7 of the head body 8 made of an iron-based metal such as S20C having a specific gravity of about 7.8 has a concave portion facing the lower surface 9A of the cavity 9. The concave receiving groove 41 has a width in the direction from the trading edge 5 to the leading edge 6 and is formed horizontally from the heel 1A to the toe 1B, and the receiving groove 41 has a specific gravity of the head body 8 such as titanium or titanium alloy. A light metal member 42 having a small specific gravity of 5 or less is fixed thereto. This fixing is performed by forming the peripheral surface 41A of the receiving groove 41 in a reverse taper shape so that the width gradually decreases downward, and press-fitting the flat lightweight member 42 into the receiving groove 41 to thereby obtain the lightweight weight. The peripheral surface 42A of the member 42 is plastically deformed and deformed into a reverse taper shape to be tightly fixed, and a part of the sole 7 is formed by the lower surface 42B of the lightweight member 42.
Further, the distance E from the face 4 to the highest portion of the sole 7 vertically from the face 4 is set to 20 mm or more.

As described above, in the above embodiment, the specific gravity is 7.
A concave receiving groove 41 is formed in the sole 7 of the head body 8 made of about 8 iron-based metal, and a lightweight member 42 made of (pure) titanium or the like having a specific gravity smaller than the specific gravity of the head body 8 is formed in the receiving groove 41. With the provision, the weight of the sole 7 can be reduced, the reduced weight can be extended rearward of the rear of the sole 7, and the center of gravity of the head 1 can be set low and deep.

When the head body 8 is made of an iron-based metal having a specific gravity of about 7.8, the specific gravity of the lightweight member 42 is set to 5 or less, so that the specific gravity difference of about 30% is used.
The rearward movement of the center of gravity can be greatly performed.

In the fifth embodiment shown in FIGS. 10 to 11, a through hole is formed in the sole 7 of the head body 8 made of an iron-based metal such as S20C having a specific gravity of about 7.8 toward the lower surface 9A of the cavity 9. 51 is formed horizontally from the trading edge 5 to the leading edge 6 with the width extending from the leading edge 6 to the toe 1B, and the specific gravity of the through-hole 51 is smaller than the specific gravity of the head body 8 of (pure) titanium or a titanium alloy. The following light metal member 52 is fixed. The fixing of the lightweight member 52 is performed by press-fitting the lightweight member 52 into a through hole 51 formed in advance through the lower surface 9A from the sole 7.
Is pressed against the peripheral surface 51A of the through-hole 51 and plastically processed and tightly fixed, and the lower surface 52B of the lightweight member 52 forms a part of the sole 7, while the upper surface 52A of the lightweight member 52 is It is formed in the same plane as the lower surface 9A. Further, the distance E from the face 4 to the highest part of the sole 7 perpendicularly from the face 4 is formed to be 20 mm or more.

As described above, in the above embodiment, the specific gravity is 7.
A through hole 51 is formed in the lower surface 9A from the sole 7 of the head body 8 made of about 8 iron-based metal, and a light member 52 made of (pure) titanium or the like having a specific gravity smaller than the specific gravity of the head body 8 is formed in the through hole 51. By vignetting, the weight on the sole 7 side can be reduced, the reduced weight can be extended rearward of the rear portion of the sole 7, and the center of gravity of the head 1 can be set low and deep.

When the head body 8 is made of an iron-based metal having a specific gravity of about 7.8, the specific gravity of the lightweight member 52 is set to 5 or less, and the specific gravity difference of about 38% is utilized.
The rearward movement of the center of gravity can be greatly performed.

In the sixth embodiment shown in FIGS. 12 and 13, the rear of the cavity 9 formed on the rear surface of the head body 8 made of an iron-based metal such as S20C having a specific gravity of about 7.8, That is, a weight 61 made of a metal having a higher specific gravity than the metal forming the head main body 8, for example, a metal such as beryllium / copper alloy, is arranged upward at the rear of the lower surface 9A of the cavity 9. The weight 61 is provided at the rear edge 9 of the lower surface 9A.
According to A ', the width from the trading edge 5 to the leading edge 6 is set so as to be horizontally fixed along the heel 1A to the toe 1B, and the lower rear edge thereof coincides with the rear edge 9A'. There is an interval I between the front part and the front face 9D so as to form an undercut cavity 9. The lower front-rear width J of the weight 61 is formed larger than the upper front-rear width K (J> K). The projection 62 projecting downward from the lower portion of the weight 61 is press-fitted and fixed to a recess 63 penetrating or recessed from the lower surface 9A toward the sole 7. The weight 61 may be fixed to the lower surface 9A by welding, bonding, or the like.

As described above, in the above embodiment, the iron type golf club in which the shaft 3 is connected to the head body 8 having the face 4 formed on the front surface, the sole 7 formed on the lower portion, and the cavity 9 formed on the rear surface. Since the weight 61 having a higher specific gravity than the metal forming the head body 8 is arranged behind the cavity 9 on the sole 7 side, the center of gravity of the head 1 can be arranged behind.

Further, by attaching a separate weight 61 upward to the lower surface 9A of the cavity 9 of the head body 8, the shape of the cavity 9 becomes an undercut state,
The center of gravity of the head 1 can be further arranged rearward.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention.

[0043]

According to the first aspect of the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface. An iron-type golf club characterized by providing a connecting through-hole and providing a plate-shaped member so as to close the sole side of the through-hole, wherein the through-hole distributes the weight to another part. The depth of the center of gravity can be reduced.

According to a second aspect of the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed at a front surface, a sole formed at a lower portion, and a cavity formed at a rear surface. And the height of the weight in the vertical direction is 3.0 mm higher than the portion formed by the surface of the head body cavity on the sole side and the surface of the weight in the cavity direction when the face is vertically arranged. An iron-type golf club characterized by being formed as described above, wherein the depth of the center of gravity of the head can be reduced by the weight.

According to a third aspect of the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed at a front surface, a sole formed at a lower portion, and a cavity formed at a rear surface, wherein a groove is provided in the sole. The groove should be at least 2.0 mm deeper than the surface drawn smoothly from the leading edge to the trading edge,
The iron-shaped golf club is characterized in that the groove is formed to have a length of 80% or more of the sole surface. The groove formed in the sole reduces the weight of the portion, and the weight is reduced accordingly. Can be distributed to other parts to reduce the depth of the center of gravity of the head.

According to a fourth aspect of the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed at a front surface, a sole formed at a lower portion, and a cavity formed at a rear surface. Or an iron-type golf club in which a through-hole is formed and a light-weight member having a smaller specific gravity than the head body is provided in the recess or the through-hole, and a light-weight member having a lower specific gravity than the head body is provided on the sole side. With this arrangement, the weight generated by the specific gravity difference can be distributed to other portions, and the depth of the center of gravity of the head can be reduced.

According to a fifth aspect of the present invention, the distance from the face to the highest portion of the sole in the vertical direction with respect to the face is 20 mm or more. Item The iron-type golf club according to Item, wherein the highest portion of the sole can be as far away from the face as possible to reduce the depth of the center of gravity.

According to a sixth aspect of the present invention, there is provided an iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface. An iron-type golf club, wherein a weight having a higher specific gravity than the metal forming the head body is arranged, and a weight having a higher specific gravity than the metal forming the head body is provided behind the cavity on the sole side. It can be placed to lower the depth of the center of gravity.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a front view showing the first embodiment of the present invention.

FIG. 3 is a rear view showing the first embodiment of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a rear view showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a third embodiment of the present invention.

FIG. 7 is a rear view showing a third embodiment of the present invention.

FIG. 8 is a sectional view showing a fourth embodiment of the present invention.

FIG. 9 is a rear view showing a fourth embodiment of the present invention.

FIG. 10 is a sectional view showing a fifth embodiment of the present invention.

FIG. 11 is a rear view showing a fifth embodiment of the present invention.

FIG. 12 is a sectional view showing a sixth embodiment of the present invention.

FIG. 13 is a rear view showing a sixth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 3 shaft 4 face 5 trading edge 6 leading edge 7 sole 9 cavity 10 through hole 12 plate member 21 61 weight 31 groove 41 receiving groove (recess) 51 through hole E distance F height

Claims (6)

[Claims] 1. An iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface, wherein a through hole is provided for connecting the sole to the lower surface of the cavity.
An iron-type golf club, wherein a plate-shaped member is provided so as to close a sole side of the through hole. 2. An iron type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface, wherein a part of the sole is formed by a separate weight. ,
The height of the weight in the vertical direction is formed to be 3.0 mm or more higher than the portion formed by the surface of the cavity of the head body on the sole side and the surface of the weight in the cavity direction when the face is arranged vertically. An iron-shaped golf club characterized by the above. 3. An iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface, wherein a groove is formed in the sole, and the groove is formed from a leading edge. An iron-type golf club, characterized in that the groove is formed at a depth of 2.0 mm or more at the deepest position from the surface smoothly drawn up to the trading edge, and the groove is formed at a length of 80% or more of the sole surface. 4. An iron-type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface, wherein a concave portion or a through hole is formed from the sole surface to the cavity. An iron-type golf club, wherein a light member having a specific gravity smaller than that of the head body is provided in the concave portion or the through hole. 5. The iron according to claim 1, wherein a distance from the face to a highest portion of the sole in a vertical direction with respect to the face is 20 mm or more. Shaped golf club. 6. An iron type golf club in which a shaft is connected to a head body having a face formed on a front surface, a sole formed on a lower portion, and a cavity formed on a rear surface, wherein a head body is formed behind the cavity on the sole side. An iron-type golf club, wherein a weight having a higher specific gravity than that of a metal to be placed is arranged.