JP2001204863A - Iron golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the deflection of a ball hitting face without working after the formation of a head of an iron golf club head of a cavity back struc ture to improve the repulsion of the ball hitting face and to increase a shot distance of a ball, and to increase a degree of freedom in design by enabling the delicate distribution of mass. SOLUTION: This iron gold club head 1 of a cavity back structure is divided into a front face part 10 and a rear face part 11, both are integrally assembled to form a head, and a cavity 12 is formed between the front face part 10 and the rear face part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron golf club head capable of improving the resilience and increasing the flight distance of a hit ball by increasing the amount of deflection of the hitting surface.

[0002]

2. Description of the Related Art Recent iron golf club heads are:
Cavity back with a configuration in which the thickness of the periphery of the head body is increased and the weight is distributed around the head body, compared to the so-called plain back iron in which the back side of the ball striking surface gradually becomes thinner from the sole part to the top edge part Irons are the mainstream. This is because the cavity back iron has higher stability in directionality with respect to variation in hit points. When combined with the cavity back structure, if the extra mass is added to the sole part, the head will have a lower center of gravity, and the ball will easily rise,
This is because it is easier to hit. In the iron golf club head having the cavity back structure, the thickness of the hitting surface portion that defines the cavity is small and the thickness of the sole portion is thick, and the hitting surface portion and the sole portion are integrally formed. For this reason, when the ball is hit, the deflection of the hitting surface is suppressed by the sole portion, so that the resilience is reduced and the flight distance of the hit ball is reduced.

[0003] In order to solve this problem, FIG.
As shown in FIG. 3, a slit 20 is provided between the thick portion of the sole portion 2 and the striking surface 4, and the slit 20 is filled with an elastic body to reduce the restraining portion of the striking surface 4, thereby expanding the sweet area and lowering the center of gravity. An iron golf club head which has been developed is disclosed in JP-A-11-104283. FIG.
As shown in the figure, the thick part of the sole part 2 is undercut 2
Japanese Patent Laid-Open No. 11-2 discloses an iron golf club head that attempts to obtain a flight distance by reducing the restraining portion of the striking surface 4 by adopting a single shape.
No. 44430.

Incidentally, in an iron golf club head disclosed in Japanese Patent Application Laid-Open No. 10-263122, which is called a hollow iron as shown in FIG. 15, the hitting surface 4 becomes large and the deflection of the hitting surface 4 also becomes large. However, from this form, a head shape having a large sole width 22 was obtained.

[0005]

However, in the iron golf club head shown in FIG. 13 which solves the problem of the iron golf club head having the cavity back structure, a core material which is provided in the slit portion in advance after the iron head body is formed. 14 is required, and FIG.
In the iron golf club head shown in (1), time and manufacturing costs are required, for example, the core needs to be attached and detached when formed by forging, and cutting needs to be performed when formed by machining. Further, it was difficult to form a slit or an undercut having a complicated shape by these processes.

In the hollow iron shown in FIG. 15, the center of gravity becomes high because the thickness of the sole cannot be increased due to weight restrictions. Furthermore, because the width of the sole part is wide,
At the time of addressing, the rear surface of the head entered the viewing angle, and the head shape was difficult to address.

Accordingly, the present invention provides a golf club head having a cavity-back structure, while maintaining characteristics such as a wide sweet area and a low center of gravity, while further improving the resilience of the ball striking surface and increasing the initial velocity of the ball. The aim is to increase the flight distance.

[0008]

SUMMARY OF THE INVENTION The present invention provides an iron golf club head having a cavity back structure in which a sole portion is thicker than a top edge portion, and a joint portion between both a front portion component and a rear portion component. It is formed by fixing and assembling together. A recess is formed in the inner surface of the front part and / or the rear part, and a joint between the front part and the rear part is fixed to form a space between the front part and the rear part. By increasing the deflection of the ball striking surface and improving resilience without processing after forming the head,
This is to increase the flight distance of the hit ball. Furthermore, since the space shape can be freely designed, fine mass distribution is possible, and the degree of freedom in design is increased.

Further, by making the front part lower in specific gravity than the rear part, the depth of the center of gravity is deepened and the sweet area can be widened. Further, by forming the front surface part integrally with the ball striking surface and the hosel, the degree of freedom of mass distribution is increased, and an iron golf club head having a lower center of gravity can be obtained.

Further, the resilience performance can be further improved by using a material of lower elasticity for the front part than for the rear part.

[0011] Further, by opening the bottom portion constituting the cavity of the rear part, the degree of freedom of mass distribution is increased,
An iron golf club head having a lower center of gravity can be obtained.

Further, the distance between the front part and the rear part is maximized at a position where the height of the iron golf club head, which is a part having a high probability of hitting the ball, from the ground contact surface is 15 mm to 25 mm. By forming the space, it is possible to further ensure that the hitting surface bends without contacting the rear part.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An iron golf club head according to the present invention has a cavity back structure in which a sole portion is thicker than a top edge portion, and includes a front part including a ball striking surface and a rear part of a remaining part. The parts are integrally assembled, and a space is formed between the front part and the rear part by forming a concave portion on the inner surface of the front part and / or the rear part. The larger the space on the back side of the ball striking face, the larger the amount of deflection is desirable. However, it is sufficient if the area of the space / the area of the ball striking face is 60% or more, preferably 70% or more. Also, the smaller the area of the joint, the lower the joining force between the front part and the rear part, so the area ratio is preferably 95% or less.

Materials for forming the iron golf club head include soft iron, stainless steel,
Aluminum, titanium, magnesium, tungsten,
A single or alloy of a metal material such as copper, nickel, cobalt, manganese, zinc, tin, and chromium is used.

The front part and the rear part are molded by die casting, press molding, injection molding, forging, casting or the like. The front and rear parts are assembled by welding, bonding, press-fitting, fitting, press-fitting, screwing, brazing, or the like. The joint between the front part and the rear part is formed with the minimum width required for the above-mentioned assembling at the outer peripheral edge, so that there is no gap when the front part and the rear part are joined. are doing. By setting the minimum width in this manner, the constraint distance of the hitting surface can be increased, and the deflection of the hitting surface at the time of hitting can be increased.

As described above, by molding the front part and the rear part, a space formed between the front part and the rear part can be easily formed even if it has a complicated shape. Further, a mass body having a higher specific gravity can be attached to the inner surface forming the space between the front part and the rear part. Therefore, delicate mass distribution can be facilitated, and the degree of freedom in design can be increased.

Further, since the front part is made of a material having a low specific gravity, a sufficient mass distribution can be provided, and an iron having a wider sweet area and a lower center of gravity than the conventional iron golf club head having a cavity back structure. It can be a golf club head. In addition, by using a low elastic material for the front part, an iron golf club head can be obtained in which the hitting surface is more bent and the flight distance is increased.

Further, by removing a part or all of the bottom surface constituting the cavity of the rear part, the degree of freedom of mass distribution is further increased, and an iron golf club head having a lower center of gravity can be obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an iron golf club head 1 including a front part 10 forming a ball striking face 4 and a remaining rear part 11 before assembling the front part 10 and the rear part 11. FIG. 2 shows the front part 10 of FIG.
FIG. 4 is a cross-sectional view taken along line AA after assembling the rear part 11.
In the embodiment shown in FIG. 1, the front part 10 is formed of a titanium plate and the rear part 11 is formed by precision casting of stainless steel.
3a, and the front part 10 is replaced with the rear part 11
In this case, the periphery of the joint 6 of both parts is welded and integrated.

FIG. 3 shows a front part 10 and a rear part 11 of the iron golf club head 1 comprising a front part 10 in which the ball striking face 4 and the hosel 5 are integrated and a rear part 11 in the remaining part. FIG. 4 is an exploded perspective view before assembling, and FIG. 4 is a sectional view taken along line BB after assembling the front part 10 and the rear part 11 of FIG. In the embodiment shown in FIG. 3, the front part 10 is formed by forging an aluminum alloy, and the rear part 11 is formed by precision casting of stainless steel. A space 12 is formed between the front part 10 and the rear part 11. The recesses 13a and 13b are provided, and the periphery of the joint 6 having a width of about 3 mm is welded and integrated with the front part 10 in accordance with the rear part 11.

FIG. 5 is a sectional view of the iron golf club head 1 in which the sole portion 2 of the concave portion 13a of the rear part 11 forming the space 12 is further deeply recessed and the space 12 is expanded to the sole portion 2. By increasing the space 12 in this way, the depth of the center of gravity can be increased, and the degree of freedom in mass distribution can be increased.

FIG. 6 is a sectional view of the iron golf club head 1 in which the upper part of the rear part 11 is thinner than the lower part and the upper part of the space 12 is widened. By widening the upper space 12 in this manner, the iron golf club head 1 having a lower center of gravity can be obtained.

FIG. 7 is a sectional view of the iron golf club head 1 in which the thickness of the portion near the peripheral edge of the front part 10 is smaller than the thickness of the hitting surface 4. By forming in this way, the deflection of the hitting surface 4 can be increased, and the deflection does not change significantly even if the hitting point varies.

FIG. 8 is a sectional view of the iron golf club head 1 in which the surface 4a opposite to the hitting surface 4 of the front part 10 has a mountain shape and is expanded inside the space 12. By continuously changing the thickness of the hitting portion in this way, it is possible to prevent the deflection of the hitting surface 4 from changing significantly even if the hitting points vary.

FIG. 9 is a cross-sectional view of the iron golf club head 1 in which the joint 6 between the front part 10 and the rear part 11 is provided as far as possible behind the hitting surface 4. By providing the joint portion 6 at the rear in this way, the impact force applied to the joint portion 6 at the time of hitting the ball can be reduced, and the variation in the deflection of the hitting surface 4 due to the joining can be reduced.

FIGS. 10 and 11 show an iron golf club head 1 in which part or all of the bottom surface 7a constituting the cavity 7 of the rear surface part 11 is removed and the bottom surface 7a of the cavity 7 is opened. It is sectional drawing. By opening the bottom surface 7a of the cavity 7 in this manner, the degree of freedom in mass distribution can be increased.

FIG. 12 shows a front part 10 and a rear part 1.
1 is the largest width portion 12 in which the space of the space 12 is the widest.
It is sectional drawing of the iron golf club head 1 which shows the position of a. As shown in the drawing, the maximum width portion 12a is formed at a position at a height of 15 mm to 25 mm from the ground contact surface 8 of the iron golf club head 1 which is a portion where the probability of hitting the ball is high, so that the front part can be hit at the time of hitting the ball. The deflection of the ball striking face 4 can be made more reliable without the 10 hitting the rear part 11. The interval between the maximum width portions 12a differs depending on the materials and shapes of the front part 10 and the rear part 11, but is preferably 0.5 mm to 5 mm.

By using a material having a lower specific gravity for the front part 10 than for the rear part 11, the degree of freedom in mass distribution can be further increased. In addition, by using a material having lower elasticity than the rear part 11 for the front part 10, the hitting surface 4
The deflection of the ball can be increased, the initial speed of the ball can be increased, and the flight distance can be increased. Also, since the impact force transmitted to the joint between the hosel 5 and the shaft when hitting can be reduced,
Shaft breakage can also be reduced. In addition, as the combination of the front part 10 and the rear part 11, it is desirable to use titanium or an aluminum alloy for the front part 10, and to use stainless steel or soft iron for the rear part 11.

[0029]

As described above, the iron golf club head of the present invention maintains the characteristics of the cavity back structure, such as a wide sweet area and a low center of gravity, while maintaining the characteristics.
Furthermore, the resilience of the ball striking surface can be improved, and the flight distance of the ball can be increased.

Further, by forming the iron golf club head by integrally assembling the front part and the rear part, a space formed between the front part and the rear part is reduced.
Even a complicated shape can be easily formed, and the degree of freedom in design can be increased.

Further, by using a material having a lower specific gravity or a material having a lower elasticity than the rear part, the front part can be made smaller than the conventional iron golf club head having a cavity back structure.
An iron golf club head with a wider sweet area, a lower center of gravity, and a more striking surface can be provided.

Further, since the iron golf club head which solves the problem of the conventional cavity back structure can be formed only by assembling the front part and the rear part integrally, processing after forming the head is unnecessary, and cost is reduced. Down is measured.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an iron golf club head showing a first embodiment of the present invention.

FIG. 2 is a view showing A after the front part and the rear part of FIG. 1 are assembled;
-A line sectional drawing.

FIG. 3 is an exploded perspective view of an iron golf club head showing a second embodiment of the present invention.

FIG. 4 is a view B after assembling the front part and the rear part of FIG. 3;
-B line sectional drawing.

FIG. 5 is a cross-sectional view showing a space shape between a front part and a rear part.

FIG. 6 is a cross-sectional view showing another example of a space between a front part and a rear part.

FIG. 7 is a cross-sectional view of the iron golf club head in which the thickness of the hitting portion of the front part is increased.

FIG. 8 is a cross-sectional view of an iron golf club head in which the thickness of the hitting portion of the front part is continuously changed.

FIG. 9 is a cross-sectional view of an iron golf club head in which a joint between a front part and a rear part is provided at the rear.

FIG. 10 is a cross-sectional view of the iron golf club head in which a part of a bottom surface part forming a cavity of a rear part is removed.

FIG. 11 is a cross-sectional view of the iron golf club head in which the entire bottom surface constituting the cavity of the rear part has been removed.

FIG. 12 is a cross-sectional view of the iron golf club head showing a position of a maximum width portion of a space between a front part and a rear part.

FIG. 13 is a sectional view of a conventional iron golf club head having a cavity back structure.

FIG. 14 is a cross-sectional view of another example of a conventional iron golf club head having a cavity back structure.

FIG. 15 is a sectional view of a hollow iron.

[Explanation of Signs] 1 Iron golf club head 2 Sole part 3 Top edge part 4 Striking surface 4a Opposite surface 5 Hosel 6 Joint 7 Cavity 8 Grounding surface 7a Bottom part 10 Front part 11 Rear part 12 Space 12a Maximum width Part 13a recess 13b recess 20 slit 21 undercut 22 sole width

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoyuki Masuda 1-12-35 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Inside Mizuno Corporation (72) Inventor Mamoru Saraya 1-chome, Minami-Kohoku, Suminoe-ku, Osaka No.12-35 Mizuno Co., Ltd. F-term (reference) 2C002 AA03 AA07 CH01 CH02 CH04 CH05 CH06 MM07 PP03

Claims (6)

[Claims] 1. A sole part (2) having a top edge part (3).
An iron golf club head (1) having a cavity back structure having a greater wall thickness, wherein a front part (10) forming a ball striking face (4) and a rear part (1) remaining.
1) is assembled integrally, and the front part (1
0) and the rear part (11) are fixed at a joint (6) between the two parts, and a space (12) is provided between the front part (10) and the rear part (11). An iron golf club head (1), characterized in that: 2. A sole part (2) having a top edge part (3).
An iron golf club head (1) having a cavity back structure, which is thicker than a front surface part (10) in which a ball striking surface (4) and a hosel (5) are integrally formed, and a remaining part. The front part (10) and the rear part (11) are configured by integrally attaching the face part (11).
The front part (10) is fixed at the joint (6) between the two parts.
An iron golf club head (1) characterized in that a space (12) is provided between the iron golf club head and the rear part (11). 3. The iron golf club according to claim 1, wherein the material forming the front part has a lower specific gravity than the material forming the rear part. Head (1). 4. The iron golf club according to claim 1, wherein a material forming the front part (10) has lower elasticity than a material forming the rear part (11). Head (1). 5. The iron golf club head (1) according to claim 1, wherein a bottom portion (7a) constituting a cavity (7) of the rear surface part (10) is opened. ). 6. A space (12) formed between the front part (10) and the rear part (11) has a height from the ground plane (8) of the iron golf club head (1). Front part (10) at the position of 15mm to 25mm
The iron golf club head (1) according to any one of claims 1 to 4, wherein the space (12) between the rear part and the rear part is formed so as to have the largest space.