JP2000005356A - Iron club head - Google Patents

Abstract

(57) Abstract: The present invention relates to an iron club head made of metal, which secures a wide sweet area, has a low center of gravity, and easily moves a ball. SOLUTION: A low-toe type having a back cavity 3, a sole portion 4 having a wide width and a large thickness, and a cutout 8 formed in a lower end portion 7 of a neck on a heel side 5 of the sole portion 4. In the metal iron club head 1, a sole weight is provided on the sole portion 4 from the back face portion 9a on the toe portion side 6 through the sole center portion 10 to the back face portion 9b on the heel portion side 5. An iron club head 1 in which a bent concave portion 11 for fitting a member is formed, and a sole weight member 12 formed in a bent shape matching the bent concave portion 11 is press-fitted and integrated. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron club head made of metal, which secures a wide sweet area, has a low center of gravity, and is easy for a ball to rise.

[0002]

2. Description of the Related Art Conventionally, an iron club head has been manufactured by precision casting or forging using lost wax.
Those formed of iron, stainless steel, titanium alloys, and other metal materials were common. However, an iron club head made entirely of the same material has a disadvantage in that the degree of freedom in designing the weight distribution of the head main body is small, and it is difficult to design a wide sweet spot or sweet area.

[0003] Therefore, in order to widen the sweet spot or sweet area, the center of gravity of the head main body is set lower and rearward, or the weight distribution of the head main body is distributed to the periphery of the head main body, so that even a beginner can use it. Iron club heads have been provided that allow the ball to rise easily and increase the flight distance.

Therefore, as one of means for realizing such an iron club head, a so-called back cavity type iron club head in which a recess is formed on the back face side of the head body has been generally used. . However, even in such a back cavity type, there is a limit in terms of weight distribution when the head body is made of the same metal material, for example, using titanium or a titanium alloy as a material. In addition, a weight member made of beryllium copper material with a large specific gravity is placed at the bottom of the back face to reduce the center of gravity of the head body without increasing the weight of the head body of the iron club head made of titanium or titanium alloy. Some are well known, but have had the improvement that they could not expand the sweet area as expected.

For this reason, a material having a larger specific gravity than the head body, such as a back cavity type iron club head made of titanium or a titanium alloy disclosed in JP-A-7-265473 or JP-A-8-257181, is used. It is also known that weight members are arranged at a plurality of locations on a face portion, a sole portion, and a back face portion of a head main body and fitted together.

[0006]

However, in the back cavity type iron club head disclosed in JP-A-7-265473 and JP-A-8-257181, weight members are provided at a plurality of positions on the head body. In the case where the head body is manufactured by a precision casting method using lost wax, many recesses for these fittings are formed. As a result, there is an improvement such as warpage of the completed head body casting itself. When the head body is manufactured by forging,
Due to the large number of these concave portions for fitting, there are problems such as cases where forging cannot be performed, and increase in accuracy and forging frequency of the forging die, resulting in significant cost increase. Therefore, there has been a demand for a back cavity type iron club head made of titanium or a titanium alloy that can provide a lower center of gravity and a wider sweet area at a low price.

[0007]

The iron club head according to the present invention has a back cavity, and the width and thickness of the sole portion are set wider and thicker than the width and thickness of the top edge portion. A toe-type metal iron club head in which a cutout is formed at a lower end of a neck on a heel portion side of a sole portion, wherein the sole portion is heeled from a back face portion on a toe portion side via a sole center portion. A bent concave portion for fitting a sole weight member is formed in a portion hanging on the back face portion on the side,
An iron club head characterized in that a sole weight member having a specific gravity greater than that of a head body formed into a bent shape matching the bent concave portion is press-fitted and integrated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 has a back cavity, a sole portion having a large width and a large thickness, and a cutout portion formed at a lower end of a neck portion on a heel side of the sole portion. A metal iron club head of a low toe type formed, wherein the sole portion has a sole weight member at a portion extending from the back face portion on the toe portion side to the back face portion on the heel portion side via the sole center portion. An iron club head, wherein a bent concave portion for fitting is formed, and a sole weight member formed in a bent shape matching the bent concave portion is press-fitted and integrated.

In the iron club head according to a second aspect of the present invention, the cross-sectional shape of the bent concave portion for fitting the sole weight member formed in the sole portion is increased toward the inner bottom surface portion from the opening width of the opening portion. It is configured to be an undercut portion to be formed.

In the iron club head according to a third aspect of the present invention, the cross-sectional shape of the sole weight member may be formed such that the width of the bottom surface of the lower sole is wider than the width of the upper surface of the sole portion. This is also preferable from the viewpoint of increasing the fitting strength.

In the iron club head according to claim 4 of the present invention, the sole weight member is made of a material having a hardness lower than that of the metal material constituting the head body, so that the press-fitting can be easily performed. Is desirable. In addition, as a metal material constituting the head main body, pure tantalum or a titanium alloy (for example, Ti-6Al-4
V, Ti-4Al-22V, Ti-15V-3Cr-3
Al-3Sn, Ti-4.5Al-3V-2Fe-2M
o, Ti-10V-2Fe-3Al, etc) can be used, and a nickel-copper alloy, nickel, beryllium-copper alloy, brass, etc. can be used as the sole weight member. As the sole weight member according to the present invention, the nickel copper alloy has good workability even in terms of hardness and good wear resistance, so that the sole portion of the head body can be reduced from abrasion due to sand and gravel received during swing. This has the effect of improving the durability of the head body.

In the iron club head according to a fifth aspect of the present invention, from the toe portion to the heel portion of the sole portion in which the sole weight member is press-fitted and integrated, the toe portion side and the heel portion side excluding the central portion thereof. It is desirable from the standpoint of preventing double bleeding that the notch portion is formed on the back face portion side because the head body swings more easily when the head body is swung.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an iron club head according to the present invention will be described with reference to the drawings, that is, as shown in FIGS.
Is a low-toe type metal iron club head 1 in which a notch 8 is formed in a neck lower end 7 on a heel side 5 of the sole 4. A bent concave portion 11 for fitting a sole weight member is formed in a portion extending from the back face portion 9a on the toe portion side 6 to the back face portion 9b on the heel portion side 5 through the sole center portion 10 and the bent portion 11 is formed. The iron club head 1 is characterized in that a sole weight member 12 formed in a bent shape conforming to the concave portion 11 is press-fitted and integrated.

As shown in FIGS. 3 and 4, the cross-sectional shape of the bent concave portion 11 for fitting the sole weight member formed in the sole portion 4 has a bottom surface deeper than the opening width 11b of the opening 11a. An iron club head 1 having an undercut portion 11A that widens toward a portion 11c.

As shown in FIG. 4, an iron is characterized in that the cross-sectional shape of the sole weight member 12 is formed so that the width of the lower bottom surface portion 12b is wider than the width of the upper surface portion 12a. The club head 1.

The sole weight member 12 of the present invention
Is preferably made of a material having a hardness lower than that of the metal material constituting the head main body 2. Particularly, as described above, the nickel copper alloy has good workability in terms of hardness and good wear resistance. It is also possible to reduce the abrasion of the sole portion of the main body due to sand, gravel or the like received at the time of swing, and to achieve an effect of improving the durability of the head main body.

Further, as shown in FIG. 2, the sole weight member 12 of the present invention has a sole center part 10 extending from the toe part side 6 to the heel part side 5 of the sole part 4 which is press-fitted and integrated. Excluding the toe side 6a and the heel side 5
It is preferable to configure the iron club head 1 in which the tapered portion 10A is formed on the back face portion side 9 of FIG. By making the sole portion bulged around the sole center portion 10 in this manner, doubles of the swing can be prevented, and further weight distribution can be performed at this portion, and the center of gravity is low at the center of gravity and behind the head body. It is possible to provide an iron club for beginners to advanced players because it can lower the ball and increase the ball's projection angle. Also, the notch 8 is formed in the lower end 7 of the neck on the heel side 5 of the sole 4,
Even if the ball is hit from any lie, the heel side 5 can be prevented from being caught.

[0018]

Since the present invention is an iron club head having a back cavity as described above and a roto-toe type, weight members are provided at a plurality of positions on the head main body as in a conventional iron club head. Because there is no need to fit, there is no need to take time in the manufacturing process, which leads to cost increase.Also, when manufacturing the head body by precision casting method with lost wax, there are few recesses for these fittings, The yield can be improved without fear of warping of the finished head body casting itself. Further, even when the head body is manufactured by a forging method, the number of these recesses for fitting is small, so that forging can be performed without increasing the accuracy and the number of times of forging, so that the cost does not increase. . Therefore, in a back cavity type iron club head made of titanium or a titanium alloy, there is an effect that an iron club head having a lower center of gravity and a wider sweet area can be provided at a low price.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an assembled state of an iron club head according to the present invention.

FIG. 2 is a perspective view showing a sole portion side of the iron club head according to the present invention.

FIG. 3 is a perspective view showing a cross-sectional position of an AA portion of the iron club head according to the present invention.

FIG. 4A of the iron club head according to the present invention in FIG. 3;
Sectional drawing which shows the cross section of -A part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron club head 2 Head main body 3 Back cavity 4 Sole part 5 Heel part side 5a Heel part side 6 Toe part side 6a Toe part side 7 Neck lower end part 8 Notch 9 Back face part side 9a Back face part side 9b Back face Part side 10 Sole center part 10A Taper part 11 Bent recess 11A Undercut part 11a Opening 11b Opening width 11c Bottom part 12 Sole weight member 12a Surface part 12b Bottom part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Junichi 1-12-35 Minami Kohoku, Suminoe-ku, Osaka-shi, Osaka Inside Mizuno Co., Ltd. (72) Inventor Lee Goto Three-stage four Jinan Road, Daan District, Taipei, Taiwan 17 Gogoro F term (reference) 2C002 AA03 CH02 LL01 MM04 PP03

Claims (5)

[Claims] 1. A low-toe type metal iron club having a back cavity, a sole portion having a wide width and a large thickness, and a cutout portion formed at a lower end of a neck on a heel side of the sole portion. In the head, a bent concave portion for fitting a sole weight member is formed in a portion of the sole portion hanging from the back face portion on the toe portion side to the back face portion on the heel portion side via the sole center portion, An iron club head, wherein a sole weight member formed into a bent shape matching the bent concave portion is press-fitted and integrated. 2. A cross-sectional shape of a bent concave portion for fitting a sole weight member formed in the sole portion has an undercut portion that widens toward a bottom portion deeper than an opening width of the opening portion. The iron club head according to claim 1, wherein: 3. The iron club head according to claim 1, wherein a cross-sectional shape of the sole weight member is formed in a shape in which a width of a lower bottom portion is wider than a width of an upper surface portion. is there. 4. The iron club head according to claim 1, wherein the sole weight member is made of a material having a hardness lower than that of a metal material constituting the head body. 5. A tapered portion is formed from the toe portion of the sole portion into which the sole weight member is press-fitted and integrated into the heel portion, on the toe portion side except the sole center portion and on the back face portion side of the heel portion. The iron club head according to claim 1, 2 or 3, wherein: