JP3453755B2 - Iron golf club - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron type golf club. Generally, golf clubs are composed of 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 heads of the iron-type golf clubs are roughly classified into a muscle shape in which the rear surface of the metal head body is formed to be substantially flat and a cavity shape in which a recess is notched in the rear surface. The head of the cavity-type iron golf club has an advantage that the weight distribution of the head can be freely set by the cavity formed so as to be cut out. By the way, even a golfer having a relatively slow head speed may use a club having a low center of gravity position of the head and a rear center of gravity in order to obtain a certain flight distance. This is because if the position of the center of gravity is low in the head and the center of gravity is behind, the hit ball is likely to rise, and backspin is likely to be applied, thereby increasing the carry. Further, in the iron club, the directionality is particularly important, and the above-described cavity type is generally used in order to reduce the bending of the hit ball even in an off-center hit. This is because the cavity-type iron-type golf club head is lightened at the center and redistributed to the periphery of the head, thereby increasing the moment of inertia and making it difficult to shake. However, the peripheral weight distribution of such a cavity head does not necessarily make the position of the center of gravity low and deep. In this respect, the wood-type thing like a driver has a wide sole and the head itself has a depth, so it is easy to devise to reduce the depth of the center of gravity, but the iron-type head is relatively flat and difficult to lower the depth of center of gravity. In addition, in the cross-sectional shape of the iron-type head, the sole shape is thick on the face side and becomes thinner toward the rear. For this reason, in order to reduce the depth of the center of gravity without changing the overall weight of the head, it is necessary to reduce the weight on the face side of the sole and redistribute it to the rear of the sole. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an iron-type golf club capable of lowering the depth of the center of gravity, that is, lowering the position of the center of gravity and further increasing the position of the center of gravity. The invention of claim 1 is an iron type golf club in which a shaft is connected to a head body having a face formed on the front surface and a sole formed on the lower surface and a cavity formed on the rear surface. Providing a through hole that connects the sole and the lower surface of the cavity, the sole side of the through hole being
The head body is fixed on the same surface as the sole and closed.
The iron-type golf club is characterized in that a plate-like member having a higher specific gravity is provided, and the through hole is formed from the heel to the toe. According to the first aspect of the present invention, the weight can be distributed to other parts by the through holes. DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. The iron-type golf club has a shaft 3 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 having the face 4 on the front surface, the hosel 2 on the upper side of the heel 1A on one side, that is, the proximal side, the toe 1B on the other side, that is, the distal side, and the sole 7 on the lower surface, for example, S20C The head main body 8 is 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, and the rear surface of the head 1 is formed in a concave shape to form a cavity 9. 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 left and right side surfaces 9C are formed substantially along the contour of the head body 8 along the contour. The thickness A of the sole 7 and the lower surface 9A is formed so as to gradually decrease backward. Further, a through hole 10 is formed so as to connect the sole 7 and the lower surface 9A. This through hole 10 is formed to be elongated by cutting from the trading edge 5 side to the leading edge 6 side and from the heel 1A to the toe 1B. This through-hole 10 is formed with substantially the same front-rear width B, 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-like member 12 is fixed to the groove 11 on the same surface as the sole 7 so as to close the through-hole 10. The plate-like member 12 is made of the same material as that of 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. The plate-like member 12
The thickness D is 5 mm or less, preferably 2 mm or less. Further, 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 a reverse taper shape so as to spread upward, and by pressing the plate-like member 12 into the groove 11, the peripheral surface of the plate-like member 12 is plastically deformed and fixed. is there. In the figure, reference numeral 13 denotes a horizontal groove called a score line or the like formed on the face 4, and the plate-like member 12 may be fixed to the groove 11 by welding or the like. As described above, in the embodiment, in the iron-type golf club in which the shaft 3 is connected to the head body 8 in which the face 4 is formed on the front surface and the sole 7 is formed on the lower surface and the cavity 9 is formed on the rear surface, Sole 7
By providing the through-hole 10 that connects the lower surface 9A of the cavity 9 and the lower portion of the rear 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. Further, by providing a plate-like member 12 in the same plane as the sole 7 at the lower part of the through hole 10, the sole 7 can be smoothly swung without hitting the green (ground) during hitting. . Moreover, the through-hole 10 is cut from the trading edge 5 side to the leading edge 6 side by cutting.
Since the lower part of the face 4 is opened from the heel 1A to the toe 1B, the degree of freedom of the lower part of the face 4 is increased when hitting a ball, and it is easy to be elastically deformed, thereby extending the flight distance. be able to. Further, by forming the through hole 10, it is possible to extend the weight of the sole 7 rearward, and the protrusion of the sole 7 is perpendicular to the face 4 with respect to the face 4. The distance E to the highest part is 20
Since it is formed to be greater than or equal to mm, 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 rearward. 4 to 5 show a first reference example, the same reference numerals are given to the same parts as those in the first embodiment, and detailed description thereof will be omitted. The rear part between the sole 7 of the head main body 8 and the lower surface 9A of the cavity 9 is cut out, and a weight 21 separate from the head main body 8 is provided at the rear part of the part. The head body 8 and the weight 21 are formed by S20C, for example. The lower surface 9A of the cavity 9 is formed in a substantially flat shape, and the sole rear portion 7 is continuous with the sole front portion 7A of the head body 8 in a curved shape.
The front surface 21A of the weight 21 forming B is inclined obliquely rearward as it goes upward. The sole front part 7 which is inclined obliquely rearward as it goes upward
A and a rear portion between the lower surface 9A of the cavity 9 and the front surface 21A
The rear portion between the lower portion and the lower portion is surface-bonded, and a protrusion 22A on the weight 21 side is fixed by a horizontally long dovetail portion 22 press-fitted into a recess 22B on the sole front portion 7A side. Furthermore, the weight 21 has a width from the trading edge 5 to the leading edge 6 of the head body 8 and a toe 1B from the heel 1A.
It is formed horizontally long. When the face 4 is arranged vertically, the weight 21 is a 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.
The surface of the cavity 9 in the direction, that is, the front surface 21A of the weight
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 portion formed by the two. With respect to the face 4, the distance E from the face 4 to the highest, that is, farthest part of the sole rear portion 7B is formed to be 20 mm or more.
In this embodiment, the head body 8 and the weight 21 are connected to the dovetail portion 22.
However, a fixing means such as welding may be used. Accordingly, in the above reference example, the rear portion of the sole 7 is formed by the separate weight 21 and the face 21 is formed.
Are disposed vertically, the surface of the cavity 9 of the head body 8 on the sole front portion 7A side and the cavity 9 of 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 direction, the cavity 9 is in a so-called undercut state, the center of gravity of the head 1 is lowered and deepened, and the head with a wide sweet area 1 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. In addition, a weight 21 having a sole rear portion 7B continuous with the sole front portion 7A, which is a separate body from the head body 8, is fixed to the head body 8 having the sole front portion 7A. The cavity 9 can be easily formed. 6 to 7 show a second reference example.
In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment,
Detailed description thereof is omitted. A groove 31 having a lower opening is formed in the sole 7 of the head body 8 made of S20C or the like on which the face 4, the sole 7, etc. are formed by cutting or the like. The groove 31 is cut out in an arc shape in cross section. The sole 7 is formed in a horizontally long shape from the heel 1A side to the toe 1B side with the width from the trading edge 5 to the leading edge 6 of the sole 7 and the lateral width G is drawn smoothly. Width of G'30
% Or more (0.3G ′ <G). Further, the length of the sole 7 is 80% or more in the direction from the heel 1A side to the toe 1B side. Further, the depth H of the groove 31 is 2.0 mm or more at the deepest position from the surface of the sole 7 drawn smoothly from the leading edge 6 to the trading edge 5. The distance E from the face 4 to the highest part of the sole 7 is formed to be 20 mm or more with the face 4 as a reference. As described above, the heel 1A has the width from the trading edge 5 to the leading edge 6 of the sole 7.
Since the groove 31 is formed from the toe 1B to the toe 1B, the weight of the lacking groove 31 can be distributed, for example, so that the rear part of the sole 7 extends rearward, and the center of gravity of the head 1 is lowered and deepened. be able to. Moreover, by forming 2.0 mm or more at the deepest part of the groove 31 from the surface of the sole 7, the weight can be sufficiently reduced, and that portion is distributed so that the rear part of the sole 7 extends backward. Thus, the center of gravity of the head 1 can be reliably set low and deep. The groove 31 is formed in a horizontally long shape from the heel 1A to the toe 1B with the width from the trading edge 5 to the leading edge 6 as a width.
Since the weight reduction by the groove 31 can be obtained uniformly, the balance of the head 1 can be ensured. In the second embodiment shown in FIGS. 8 to 9, the sole 7 of the head main body 8 made of iron-based metal such as S20C having a specific gravity of about 7.8 is recessed toward the lower surface 9 A of the cavity 9. A concave receiving groove 41 is formed in a horizontally long shape from the trading edge 5 to the leading edge 6 and extending from the heel 1A to the toe 1B, and in the receiving groove 41 from the specific gravity of the head body 8 such as (pure) titanium or titanium alloy. A metal lightweight member 42 having a small specific gravity of 5 or less is fixed. This fixing is done by forming a reverse tapered shape so that the circumferential surface 41A of the receiving groove 41 is gradually narrowed downward, and press-fitting the flat lightweight member 42 into the receiving groove 41. The circumferential surface 42A of 42 is plastically deformed and deformed into a reverse taper shape and is firmly 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 part of the sole 7 with respect to the face 4 is set to 20 mm or more. As described above, in the above-described embodiment, the sole 7 of the head body 8 made of an iron-based metal having a specific gravity of about 7.8.
A concave receiving groove 41 is formed on the head body 8 in the receiving groove 41.
By providing a lightweight member 42 made of (pure) titanium or the like having a specific gravity smaller than the specific gravity, the weight on the sole 7 side can be reduced, and the rear portion of the sole 7 can be extended to the rear of the reduced weight. Thus, the center of gravity of the head 1 can be set low and deep. Further, 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 a specific gravity difference of about 30% is utilized.
It is possible to move the center of gravity backward. In the third embodiment shown in FIGS. 10 to 11, a through hole is formed in the sole 7 of the head body 8 made of 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 heel 1A to the toe 1B with the width from the trading edge 5 to the leading edge 6 and the specific gravity smaller than the specific gravity of the head body 8 such as (pure) titanium or titanium alloy is 5 or less. The metal lightweight member 52 is fixed.
This fixing is achieved by press-fitting a lightweight member 52 into a through-hole 51 previously formed through the sole 7 from the lower surface 9A.
The peripheral surface 52A of 52 is pressure-bonded to the peripheral surface 51A of the through-hole 51 and is plastically worked to be firmly fixed. A part of the sole 7 is formed by the lower surface 52B of the lightweight member 52, while the upper surface 52A of the lightweight member 52 is formed. Is formed in the same plane as the lower surface 9A. The distance E from the face 4 to the highest part of the sole 7 is formed to be 20 mm or more with the face 4 as a reference. As described above, in the above-described embodiment, the sole 7 of the head body 8 made of an iron-based metal having a specific gravity of about 7.8.
A through hole 51 is formed in the lower surface 9A from the bottom, and a light weight member 52 made of (pure) titanium or the like having a specific gravity smaller than the specific gravity of the head body 8 is provided in the through hole 51, thereby reducing the weight on the sole 7 side. The reduced weight can extend the rear portion of the sole 7 rearward, and the center of gravity of the head 1 can be set low and deep. In the case where 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 so that a specific gravity difference of about 38% is utilized.
It is possible to move the center of gravity backward. In the third reference example shown in FIGS. 12 to 13, the cavity 9 formed on the rear surface of the head body 8 made of iron-based metal such as S20C having a specific gravity of about 7.8 is located behind the sole 7 side. That is, a weight 61 made of a metal having a specific gravity higher than that of the metal forming the head body 8, for example, a metal such as beryllium / copper alloy, is disposed on the rear side of the lower surface 9 </ b> A of the cavity 9. The weight 61 is a rear edge 9 of the lower surface 9A.
According to A ′, the trading edge 5 to the leading edge 6 are arranged in width and are fixed in a horizontally long manner from the heel 1A to the toe 1B, and the lower rear edge thereof coincides with the rear edge 9A ′. In addition, an interval I is provided between the front portion and the front surface 9D so as to form an undercut cavity 9. Further, the front-rear width J of the lower portion of the weight 61 is formed larger than the front-rear width K of the upper portion (J> K). The protrusion 62 protruding downward from the lower portion of the weight 61 is press-fitted into and fixed to a recess 63 penetrating or recessed from the lower surface 9A toward the sole 7. The means for fixing the weight 61 on the lower surface 9A may be welding, bonding or the like. As described above, in the iron-type golf club in which the shaft 3 is connected to the head body 8 in which the face 4 is formed on the front surface and the sole 7 is formed on the lower surface and the cavity 9 is formed on the rear surface, the sole of the cavity 9 is formed. 7
Since the weight 61 having a higher specific gravity than the metal forming the head body 8 is disposed on the rear side, the center of gravity of the head 1 can be disposed on the rear side. Furthermore, 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 undercut,
Further, the center of gravity of the head 1 can be arranged rearward. In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. 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 the front surface and a sole formed on the lower surface and a cavity formed on the rear surface. A through hole connecting the lower surface of the cavity is provided, and the sole side of the through hole is flush with the sole.
Larger specific gravity than the head body so that it sticks on top and closes
It is an iron type golf club characterized in that a plate member of a threshold material is provided and the through hole is formed from the heel to the toe, and the weight is distributed to other parts by the through hole. Can lower the depth of gravity,
Since the lower rear part of the face is in an open state, the degree of freedom of the lower rear part of the face is increased at the time of hitting, the elastic deformation becomes easy, and the flight distance can be extended.

[Brief description of the drawings] FIG. 1 is a cross-sectional view showing a first embodiment of the present invention. FIG. 2 is a front view showing a first embodiment of the present invention. FIG. 3 is a rear view showing the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing a first reference example. FIG. 5 is a rear view showing a first reference example; FIG. 6 is a cross-sectional view showing a second reference example. FIG. 7 is a rear view showing a second reference example. FIG. 8 is a cross-sectional view showing a second embodiment of the present invention. FIG. 9 is a rear view showing a second embodiment of the present invention. FIG. 10 is a cross-sectional view showing a third embodiment of the present invention. FIG. 11 is a rear view showing a third embodiment of the present invention. FIG. 12 is a cross-sectional view showing a third reference example. FIG. 13 is a rear view showing a third reference example. [Explanation of symbols] 3 Shaft 4 face 7 Sole 9 cavity 10 Through hole 12 Plate member 41 51 Receiving groove (recess) 42 52 Light weight

Continuation of front page (56) References JP-A-6-23074 (JP, A) JP-A-10-258143 (JP, A) JP-A-11-178961 (JP, A) JP-A-8-776 (JP , A) JP-A-8-38658 (JP, A) JP-A-10-155946 (JP, A) JP-A-8-294552 (JP, A) JP 60-147451 (JP, U) JP 61-133070 (JP, U) Registered utility model 3035480 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) A63B 53/00-53/16

Claims (1)

1. An iron-type golf club in which a shaft is connected to a head body having a face formed on the front surface and a sole formed on the lower surface and a cavity formed on the rear surface. Provide a through hole to connect the bottom surface,
A plate-like member made of a material having a specific gravity greater than that of the head body is provided so that the sole side of the through hole is fixed and closed on the same surface as the sole , and the through hole is formed from the heel to the toe. Iron-type golf club characterized by