JPH01141679A - Golf club - Google Patents

Abstract

PURPOSE: To bring the sole of a head into contact at a point with the green to facilitate hitting through by setting curvature radius of the sole from the face to the back in large and small accompanied with long and short of a shaft. CONSTITUTION: The sole 15 of a head 13 of the third iron club 12 is set in such a way that the curvature radius A from the face 14 to the back 16 is approximately the same as the swing radius A', namely it is formed large in proportion to the length L of a shaft 11. In addition, in the head 13F of the ninth iron club 12F, the curvature radius G of the sole 15F is set so as to make it approximately the same as the swing radius G', namely it is formed small in proportion to the length of a shaft 11F. Therefore, when the third iron club 12 is swung, namely when the angle γ of incidence to the green is small, the sole can be brought into contact at a point with the green and on the other hand, when the ninth iron club 12F is swung, namely when the angle δof incidence to the ground is large, the sole can be brought into contact at a point with the green.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a golf club that is susceptible to heat-through.

(Prior Art) Conventionally, in golf clubs, especially iron clubs,
For example, as disclosed in Japanese Utility Model Application Publication No. 59-193462, the soles of each head have almost the same curvature from long iron clubs No. 3 and 4 to short iron clubs No. 8 and 9. It was formed into an arc shape with a radius.

(Problems to be Solved by the Invention) In a conventional golf club set, in which the radius of curvature of the sole from the face to the back of the short iron club to the long iron club is formed into an almost same arc shape, the hit-through of the head is difficult to achieve. ＜There is a problem that the head tends to get caught. That is, as shown in FIG. 4(A), in the case of the short iron club 1, the shaft 2 is short, and the swing radius r becomes smaller accordingly.
The angle of incidence α on the ground increases. On the other hand, in the case of a long iron club IA as shown in Fig. 4 (B), the shaft 2
Since the person is long, the radius R of the swing becomes large, and the angle of incidence β on the ground becomes small. Therefore, in the case of the long iron club IA, the back side of the sole 3A comes into contact with the ground during the swing, and if the tangential start 14A is formed in the center of the sole 3A, the hook-J will still be caught during the swing. There are some problems that can easily occur.

The present invention has been made based on the above-mentioned problem, and is a golf club in which the angle of incidence on the ground differs depending on the length of the shaft, and the sole has an optimal shape to facilitate slip-through. The purpose is to provide

[Structure of the Invention] (Means for Solving Problems) In the present invention, the radius of curvature of the sole of the head is set to be large or small depending on the length of the shaft.

(For I1MI) For shots - The sole of the rad can be in constant contact with the green, making it easier to hit through without getting caught.

(Embodiment) Next, a first embodiment of the present invention will be explained with reference to FIGS. 1 and 2.

FIG. 1(A) shows a No. 3 iron club 12 having a shaft 11 of a predetermined length, a face 14 having a predetermined angle θ is formed on the front surface of the head 13, and a sole 15 on the bottom. A balance bag 16 is formed on the rear surface for adjusting the center of gravity of the head and y-board. Further, a groove 17 for forming the shaft 11 is integrally formed on one side of the head 13.

The sole 15 of the head 13 has a radius of curvature A extending from the face 14 to the back 16, as shown in FIG. 2(A).
It is set so that the swing radius A' and the road distance are -. That is, the radius of curvature A of the sole 15 is made large in proportion to the length of the shaft 11.

Similarly, in the 4th to 8th iron clubs shown in FIGS. 1(B) to 1F), shafts 11A, IIB,
11C, 11D, 11E and angle θ1. θ2. θ3
．． θ4. No. 4 to No. 8 iron club 1 with θ5
2A, 12B, 12C.

12D, 12E are each head 13A, 13B, 13C
, 13D, 13E sole 15A, 1513.15C
, 15D.

ISB has each shaft 11A, IIB, 11C, 11
D.

Its radius of curvature B, C is proportional to the length of 11E.

D, E, and F are set to be small.

Head 1 of a 9# iron club 12F having a short shaft 11F and a predetermined angle θ6 as shown in FIG. 1(G)
At 3F, the radius of curvature G of the sole 15F is set so as to be between the swing radius G' and the path as shown in FIG. 2(B).

In other words, is the radius of curvature G of the sole 15F equal to the shaft 111?
becomes smaller in proportion to its length.

Therefore, as shown in FIG. 2(A), the shirt l-11
When swinging a long No. 3 iron club 12, that is, even when the angle of incidence γ with respect to the green is small, the sole 15 can make point contact with the green; on the other hand, as shown in FIG.
As shown in FIG. 2, even when a No. 9 iron club 12F with a short shaft 11F is swung, that is, when the angle of incidence δ with respect to the ground is large, the sole 15F can make point contact with the green.

As mentioned above, by setting the radii of curvature A, B, ... of the sole 15.15A, ... as in the formula below, αL + β α ... proportionality constant β ... constant L ... ...Length of shirt 1 (Also, α and β are determined depending on the player's height, arm length, etc.) Actual swing diameter and sole 15.15A,
By setting the radius of .

FIG. 3(A) shows the driver, and the head 21
A face 22 is formed at a predetermined angle on the front surface, and a sole 23 is formed on the bottom. Further, a neck 25 for connecting the shaft 24 is integrally formed on one side of the head 21.

The radius of curvature H of the face 22 and the back 2G in the sole 23 is proportional to the length of the shaft 24 so that the swing radius H' is wide. The head 31 has a face 32, a saw 71 . - A neck 35 for connecting the sole 33 and the shaft 34 is integrally formed, and the radius of curvature I of the sole 33 is proportional to the length of the shaft 34 that is formed at the swing radius I.

As mentioned above, for drivers and woods, the radius of curvature of the sole 23.33 is 1 (, I is the swing radius 1
4゛. ■ Shaft 24.34 so that ° and time -
By increasing the size in proportion to , it is possible to provide a golf club that is easy to handle and does not get caught.

It should be noted that the present invention is not limited to the above embodiments, and is not limited to the above formula, for example, it may be provided in an arithmetic progression as shown in the following formula, or A+Ly'='+CA is the radius of curvature l. , for example, is the shaft length of the driver γ: geometric constant n: a loss C: constant or, for example, can be set in a geometric progression as shown in the formula below, A=L+(n-1) d A is the radius of curvature I- is, for example Various modifications are possible, such as setting the driver's shaft length n: series d: constant to the swing radius and time, or using a hollow metal head for the wood.

[Effects of the Invention] The present invention sets the radius of curvature of the sole from the face to the back to be large or small according to the length of the shaft, so that point contact with the green can be made when shooting, and stable shots can be made without catching or the like. be able to.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention,
FIGS. 1A to 1G are cross-sectional views of No. 3 to No. 9 iron clubs. FIGS. 2(A) and 2(B) are partially enlarged front views showing how the 3# and 9# iron clubs are used;
Figures 3 (A) and (B) are partially enlarged front views showing how the driver and No. 3 wood are used, and Figures 4 (A) and (B).
) is a cross-sectional view showing how conventional No. 9 and No. 3 iron clubs are used. 11...Shaft 14...Face 1G...Back A...Curvature radius Fig. 2 A) Fig. 3 (A) Fig. 2 (B) Fig. 3 (B)

Claims (1)

[Scope of Claims] A golf club characterized in that the radius of curvature of the sole from the face to the back is set to be large or small depending on the length of the shaft.