JPS63192474A - Iron club head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a golf club iron set.

(Prior Art and Problems) The sweet spot of a golf club is the intersection of the perpendicular line drawn from the center of gravity of the club head to the ball-striking surface and the ball-striking surface.
When the ball is hit at the sweet spot, maximum initial velocity can be given to the ball, and the direction of the ball can also be stabilized. Also, when the ball is hit off the sweet spot, the impact causes the club head to rotate around the head's center of gravity, resulting in a lower initial velocity and a shorter flight distance than if the ball were hit in the sweet spot. do. Also, there is a large fluctuation in the direction of the ball's flight.
The direction is poor.

In order to minimize the decrease in the initial velocity of the ball and the fluctuation in the direction of launch, the moment of inertia of the head is increased.
It is generally well known that rotational movement about the center of gravity of the club head should be suppressed as much as possible.

Conventional methods for increasing the moment of inertia (hereinafter referred to as I) of a club head include: (1) Japanese Utility Model Publication No. 53-288 spreads the weight distribution of the head as much as possible to the outer periphery of the club head on the back of the ball-striking surface of the club head. It is proposed to increase ■ by making it biased. However, in this utility model, the size of the head is almost the same as that of a conventional iron head, and there is a limit to increasing the size of the iron head.

(2) Utility Model Publication No. 61-165762 stipulates the horizontal length of the ball-hitting surface of the club head, and also stipulates the vertical length for each club club head. It is proposed to increase the vertical length. However, in this utility model, since the vertical length of the ball hitting surface is large, the sweet spot is located high;
The disadvantage was that the ball was hit well below the sweet spot, and the trajectory of the ball was low and the flight distance was short.

(Means for Solving the Problems) In order to eliminate the drawbacks of the above-mentioned conventional example, the present invention is a club head that minimizes the reduction in flight distance when the ball is hit off the sweet spot and the deflection in the direction of the ball's flight. In order to increase the ball-hitting area and make it extremely safe to hit the ball, the vertical length of the ball-hitting surface was kept at an appropriate level, while the horizontal length was increased, and the area of the ball-hitting surface was made smaller than the conventional one. It is made larger than the club head of an iron club.

The material of the iron head of the golf club according to the present invention is, for example, a low specific gravity metal such as aluminum or magnesium, a whisker-reinforced metal in which these metals are mixed with whiskers such as silicon carbide whiskers, or a composite material such as carbon fiber. Using fiber-reinforced plastics, etc., the horizontal length of the ball hitting surface is 96- or more, 1
10 towns or less, and the vertical length of the ball hitting surface,
For each club number in the iron club set, No. 3 iron: 46- or more, 57 + ms or less, No. 4 iron, 46 or more, 58 M or less, No. 5 iron, 47 n+s or more, no more than 60 m, No. 6 iron 4
8+w* or more 61- or less 7 @ Iron 49 Oi 153m
No. 8 iron of m or less 50-64 m or less No. 9 iron 511 or more and 66- or less Pw Faian 2L 111 I or more and 75 or less Sw iron 53 mm or more and 80 or less.

The present invention further provides a club head in order to adjust the weight of each number of an iron type club head to a preferable weight, to adjust the position of the sweet spot to a preferable state, and to further increase the l of the head. A hole for weight adjustment is provided on the back of the iron head, and a weight body such as lead or steel may be attached to this hole. Considering the specific gravity of the various materials of the iron head, the horizontal length of the ball-hitting surface is the same as before. Approximately 25~
By increasing the length of the ball hitting surface in the vertical direction by 50%, the square radius of the head can be increased, and the vertical length of the ball hitting surface can be maintained at an appropriate level. As a result, the position (height) of the sweet spot is not much different from that of conventional products, and the probability of hitting the ball at the sweet spot in the vertical direction of the ball hitting surface is not impaired.
Even if the ball is hit horizontally off the sweet spot, it is possible to minimize the reduction in flight distance. or,
The area of the ball hitting surface has been increased by 40 to 60%, making it possible to hit the ball with greater peace of mind.

(Example) Hereinafter, an example of an iron head according to the present invention will be explained.

Table 1 shows the dimensions of an iron-type club head (product of the present invention) made from a whisker-reinforced metal made by mixing silicon carbide whiskers with aluminum, and the area of the spherical surface. The values are shown in comparison with conventional products).

Table 2, like Table 1, shows the sweet spot position and the distance from the shaft axis to the sweet spot of the embodiment of the product of the present invention in comparison with the conventional product. Here, as shown in FIG. 1, the length L (L') in the five horizontal directions is the length from the point 3 where the axis 6 of the shaft 5 intersects the knoll 2 to the toe l, and the length H in the one vertical direction (H') is the length from the sole 2 to the upper end 4 of the stamping surface. The area of the ball-hitting surface ~(A') is defined as the ball-hitting flat area from the end 3 where the axis of the shaft intersects with the sole to the toe 1.

Also, the sweet spot S (S') is the shaft D
Indicated by the horizontal distance 1 [M (M') from the point 3 where the axis and the sole intersect to the sweet spot, and the vertical path MN (N') from the sole 2 to the sweet spot,
The distance from the shaft axis to the sweet spot is the length R (R') of a perpendicular line drawn from the sweet spot 15 (S') to the shaft axis.

FIG. 2 is a rear view of an iron head according to an embodiment of the present invention, in which a blind hole 7 for height adjustment is opened from the back of the club head toward the ball hitting surface 6 by shifting the center of gravity of the club head. A predetermined amount of weight body 8 made of lead, copper, etc. is attached to 7,
Furthermore, the blind hole is closed with a decorative plate 9 made of a thin plate of aluminum, plastic, or the like.

4 and 5 show a second embodiment of the present invention.

The basic member 10 of the club head is made of a metal with low specific gravity such as aluminum, magnesium, titanium, etc. to form a large head, and a recess 11 is provided on the back side, and a recess 11 is formed in the back, and a material such as stainless steel, iron, copper, bronze, etc. A heavy body 12 made of a high specific gravity metal with a large target specific gravity is inserted and buried. In this second embodiment, the weight body 12 is buried near the toe, the heel, and the sole, so that the weight is even stronger! The value is large;
Furthermore, the sweet spot is lower. Furthermore, the sweet spot can be located at various positions by variously changing the shape of the weight body other than in this embodiment.

FIGS. 6 and 7 show a third embodiment of the present invention.

An aggregate 13 whose club head is made of stainless steel, iron, etc.
It is composed of a composite of reinforced plastic 14 reinforced with carbon fiber, aramid fiber, whisker fiber, etc., and the elasticity of the reinforced plastic increases flight distance. In addition, in this embodiment, the neck part and sole part are made of aggregate 13.
However, if the aggregate 13 is formed into a frame shape and the weight of the head is placed on the periphery, the moment of inertia will be larger.

FIGS. 8 and 9 show a fourth embodiment of the present invention.

In the club head, a plate member 15 made of a ceramic material such as alumina or zirconia is inserted in the center of the club head of the third embodiment described above to increase the strength of the head. Also, in this embodiment, a ceramic member plate is used for a part of the head, but the entire head may be made of ceramic members. Figures 10 and 11 show a sixth embodiment of the present invention. In order to realize the present invention, a hollow portion 16 is formed in the club head to form a hollow structure. Further, the ball hitting surface is reinforced by forming a bevel 17 behind the ball hitting surface 6. With this structure, the present invention can be carried out even if the head rope material has a high specific gravity.

Figures 12 and 131! Further, it is a sixth embodiment of the present invention, in which the back surface of the club head has a honeycomb structure 18, so that the ball hitting surface can be reinforced and the size of the head can be increased. Further, the honeycomb structure may be provided inside the head without being exposed on the back surface.

14 and 15 further show a seventh embodiment of the present invention, in which the club head is made of metals commonly used for club heads, such as stainless steel, iron, bronze, etc. It is a thinner version of the above. Further, in order to stabilize the club head at address, the sole may be provided in an L-shape.

A comparison test was conducted using a robot machine between the products of the present invention shown in Tables 1 and 2 and the conventional No. 5 iron, and the results shown in FIG. 3 and Table 3 were obtained.

Table 3 Unit m From these results, the product of the present invention has (1) a flight distance of approximately 7.6 when hit at the sweet spot compared to the conventional product;
It became m large.

(2) Hit the ball off the sweet spot (toe 1.2
mm), the flight distance was approximately 0 m.

(3) The drop in flight distance when missing the sweet spot is small.

Furthermore, (4) when comparing a ball hit with the product of the present invention off the sweet spot and a ball hit with the sweet spot of the conventional product, the product of the present invention had a longer flight distance of 5.9 m.

The reason for these results (+) to (4) is that the distance R from the shaft axis to the sweet spot is different from that of the conventional product R.
′, the length from the grip end to the sweet spot is longer by K, and the speed of the sweet spot is increased.

In addition, in actual use, as shown in Table 2, the vertical sweet spot position (height) N of the product of the present invention is almost similar to that of the conventional product; The probability of hitting the ball is not affected.

Although the embodiments shown in the drawings have been described above, the present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention as set forth in the claims.

(Effect of the invention) As described in the example, the horizontal I value is about 25 to 35.
% increase, and even if you hit the ball off the sweet spot, the flight distance will be reduced and the direction of the ball will be improved. Furthermore, the increased area of the ball hitting surface allows the player to hit the ball with confidence. Also, the position (height) of the sweet spot is not much different from the conventional product.
The probability of hitting the ball at the sweet spot in the vertical direction of the ball hitting surface is not impaired. In addition, it is possible to provide a club that can fly farther than conventional products.

41 "3" Description of Drawings FIG. 1 is a diagram showing the dimensions of various parts of iron club heads of the conventional product and the product of the present invention. FIG. 2 is a rear view of the first embodiment of the product of the present invention, showing the moment of inertia (moment of inertia around the center of gravity in the horizontal direction) (
1) This shows the axis of rotation during measurement. FIG. 3 is an end view taken along the line a-a' in FIG. 2. FIG. Figures Wc4 and 5 are a rear view and an end view of the bb' cross section of the second embodiment of the present invention. FIGS. 6 and 7 are a rear view and an end view taken along the line cc' of the third embodiment of the present invention.

8 and 9 are rear views and d of the fourth embodiment of the present invention.
It is an end view of the -d' cross section. Figures 10 and 11 are
FIG. 7 is a rear view and an end view of the cross section e-e' of a fifth embodiment of the present invention. FIGS. 12 and 813 are a rear view and an end view of the ff' section of the sixth embodiment of the present invention. 14 and 15 are a rear view and an end view of the gg' cross section of the sixth embodiment of the present invention. FIG. 16 shows the relationship between flight distances when the hitting points of a conventional product and a product of the present invention are shifted in the horizontal direction using a robot machine. l... Toe, 2... Sole, 3...-Intersection of shaft axis and sole, 4... Upper end of ball hitting surface, 5... Shaft, 5'... Axis of shaft, 6... Skewer・Ball hitting surface, 7...Blind hole, 8...Heavy body, 9...Decorative plate, 10...φ basic member, 11・φ・
Recessed portion, 12... Weight body, 13... Aggregate, 14...
Reinforced plastic, 16... Plate material, 16... Hollow part, 17... Rib, 18. Honeycomb structure, A...
Area of the ball-hitting surface (product of the present invention), A'...Area of the ball-hitting surface (conventional product), H...-vertical length (product of the present invention), H
′ ・Long length in the vertical direction (conventional product), L ・Long length in the horizontal direction (invented product), L′ ・Length in the horizontal direction
Conventional product), M...Horizontal distance from the intersection of the shaft axis and sole to the sweet spot (present invention product), M'
...Horizontal distance IIK from the intersection of the shaft axis and the sole to the sweet spot (conventional product), N...Vertical distance from the sole to the sweet spot (invention product), N'
... Vertical distance from the sole to the sweet spot (conventional product), R... Length of the perpendicular line drawn from the sweet spot to the shaft axis (invented product), R'... Perpendicular line drawn from the sweet spot to the shaft axis line long conventional product)
, K... Difference in length from the grip end to the sweet spot between the product of the present invention and the conventional product, S... Sweet spot of the product of the present invention, N' Clear... Sweet spot of the conventional product,
Z: Horizontal axis of rotation.

Claims (9)

[Claims] (1) In a golf club with a club head attached to one end of the shaft and a grip attached to the other end, the horizontal length of the ball hitting surface of the club head is 96 mm or more and 110 mm.
1. A club head for an iron, which satisfies the following characteristics and has a vertical length of the ball-hitting surface set to 45 mm or more and 80 mm or less. (2) The vertical length of the ball hitting surface is: No. 3 iron: 45 mm or more and no more than 57 mm No. 4 iron: 46 mm or more and no more than 58 mm No. 5 iron: 47 mm or more and no more than 60 mm No. 6 iron: 48 mm or more and no more than 61 mm No. 7 iron: 49 mm or more and no more than 63 mm No. 8 iron The iron club head according to claim 1, wherein the iron club head is set to 50 mm or more and 64 mm or less, 9 iron 51 mm or more and 66 mm or less, Pw iron 52 mm or more and 75 mm or less, and SW iron 53 mm or more and 80 mm or less. (3) The iron according to claim 1, wherein the club head is made of a light metal such as aluminum or an aluminum alloy, or a fiber-reinforced metal obtained by compositely reinforcing these light metals with whiskers, alumina fibers, etc. club head. (4) The club head is made of low specific gravity metals such as aluminum, magnesium, titanium, stainless steel, iron, copper, etc.
The iron club head according to claim 1, characterized in that it is constructed of a composite material with a high specific gravity metal such as bronze. (5) The club head is composed of a composite of metal aggregate and reinforced plastics reinforced with carbon fiber, aramid fiber, whisker fiber, etc. Club head for iron. (6) The iron club head according to claim 1, wherein at least a portion of the club head is made of a ceramic member such as alumina or zirconia. (7) The iron club head according to claim 1, wherein the club head has a hollow structure. (8) The iron club head according to claim 1, wherein the back surface or inside of the club head has a honeycomb structure. (9) The iron club head according to claim 1, wherein the club head is made of metal such as stainless steel, iron, or bronze, and has a thin wall from the ball hitting surface to the back surface of the club head.