JP2987832B2 - Iron type golf club - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to iron-type golf clubs such as 1 to 9 irons, pitching wedges and sand wedges.

[0002]

Golf clubs consist of a shaft and a club head, and irons are classified according to the loft angle. An iron type golf club head having a small loft angle, for example, 20 to 30 degrees (hereinafter referred to as a head) is called a long iron, and a head having a large loft angle, for example, 40 to 50 degrees, is called a short iron. Heads are numbered from long iron to short iron, numbered 1-9
Irons, pitching wedges (PW), sand wedges (SW), and the like.

[0003] The head has a front face for hitting a golf ball and a back face (back face).
The back surface may have a cavity or a smooth surface. Each face has an area, referred to as a sweet area, where the best results are obtained when hitting a golf ball. A cavity back head having a cavity on the back surface has a sweet area larger than a solid iron having a smooth back surface. In the case of the cavity back head, the position of the center of gravity of the head can be adjusted by changing the weight of the outer peripheral portion on the back surface. As a result, the sweet area can be expanded by distributing the weight around the face. However, the head itself must be set to a certain weight,
There is a problem that the weight distribution cannot be set freely.

As one means for solving such a problem,
FIG. 6 of Japanese Utility Model Laid-Open Publication No. Hei 6-31766 shows that a reinforcing rib whose height and width are larger than the depth and width of the face groove, respectively, is protruded from the back of the face, and the position and direction of the rib are determined by the face groove. And a head that can be provided with a rib for sub-reinforcing in a direction substantially perpendicular to the rib, so that the face can be made thinner.

However, in such a head, the cross-section of each rib has the same cross-section at the center of the rib and at the top and bottom of the rib. Therefore, it is not necessary to use the same material for the rib upper and lower parts by making the rib central part where the maximum strength is added when hitting the golf ball and the rib upper and lower parts having lower strength than the rib central part have the same cross-sectional shape. As a result, there is a problem that more weight cannot be distributed around the face.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an iron-type golf club capable of solving the above-mentioned problems and reducing the thickness of the face as much as possible, and the ribs can be also optimally reduced in thickness. I do.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to an iron-type golf club in which a shaft is connected to an iron-type golf club head having a plurality of ribs provided on the back surface of a face provided with a face groove. Protrusions projecting rearward are provided annularly along the edge and form a sole, and the ribs are juxtaposed at intervals so as to be substantially perpendicular to the direction of the face groove. The height and width of the upper and lower portions are formed gradually smaller than the height and width of the central portion, and the outermost of the ribs located closer to the center of the back of the adjacent ribs than the maximum height and the maximum width of the ribs An iron-type golf club wherein the maximum height and the maximum width of adjacent ribs are sequentially reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The head body 1 has a face 2 for hitting a golf ball (not shown) on the front surface and a back surface 3 thereof, and a hosel 5 for connecting a shaft 4 on the negative side. The face 2 is provided with a plurality of face grooves 6 called a score line or the like. Around the back surface 3, a protrusion 7 projecting rearward is provided in a ring shape along the edge, and a sole 8 is formed by the protrusion 7. 9 indicates a heel and 10 indicates a top.
The head body 1 is formed by forging a metal such as iron.

The ribs 11, 12, 13, 14, provided on the back surface 3
15, 16, 17, 18, 19, 20, 21 are arranged side by side so as to be substantially perpendicular to the direction of the face groove 6, and these ribs 11 are simultaneously formed by forging when forming the head body 1. . The ribs 11,... Are arranged at equal intervals A of, for example, 3 to 9 mm, preferably 6 mm between centers of the ribs 11, 12 and at intervals B between adjacent ribs 11, 12. Has been established.

The ribs 11,... Are shown in FIGS.
As described above, the height C and the width D of the central portion 11A of the rib 11 gradually decrease in the upward direction, and also gradually decrease in the downward direction. That is, the height C
And the width D are the maximum height and maximum width of the rib 11.
Similarly, in the rib 21 located on the top 10 side as shown in FIG. 6, the height C 'and the width D' at the central portion 21A gradually decrease in the upward direction, and also gradually decrease in the downward direction. It has become. Other ribs 12,1
The same applies to 3, 14, 15, 16, 17, 18, 19, 20. The width W of the top of each rib 11 is formed to be 0.5 to 2 mm, preferably about 1 mm.

Further, as shown in FIG. 4, the cross section of each rib 11 is substantially trapezoidal, and the maximum height C and the maximum width D of the rib 11 located substantially at the center of the back surface 3 are the right and left sides of the rib 11. Heights C ″ and maximum widths D ″ of the ribs 12, 19 located respectively at
′. Similarly, the outermost ribs 13,... 18 are located on the outer side, but the maximum height and the maximum width are sequentially reduced. Similarly, with respect to the ribs 20 and 21 adjacent to the outside, the maximum height and the maximum width of the ribs located outside are sequentially reduced. The maximum height C 'and the maximum width D' of the outermost ribs 18, 21 are respectively set to the minimum values. That is, the cross section of the adjacent ribs 11,... Is similar to a trapezoidal shape, and the outer side of the rear surface 3 is formed with the maximum height and the maximum width sequentially smaller than the central one. . As a result, as shown in FIG.
Compared with the ribs 11, 19, the ribs 12, 19 adjacent to the outside of the rib 11 corresponding to the approximate center of the face 2 hitting the golf ball are formed to be smaller.

As described above, in the above embodiment, the face 2
By providing the ribs 11 on the back surface of the face 2, the thickness of the face 2 can be reduced to about 2 mm, and the reduced weight can be distributed to the protrusions 7.

Also, ribs 11,... Are arranged on the back surface 3 at intervals B so as to be substantially perpendicular to the direction of the face groove 6, and the ribs 11,. By making the upper and lower portions 11B, 11C, 21B, 21C smaller than the width D and the center portion 11A, 21A of each of the ribs 11,... 21 requiring a large strength when hitting a golf ball, On the other hand, by reducing the upper and lower portions 11B, 11C, 21B, 21C which require relatively small strength when hitting a golf ball, the optimum ribs 11,... 21 can be formed. As a result, the upper and lower portions 11B, 11C, 21B, 21C of the ribs 11,... 21 have no useless portions, and the weight distribution of the head can be freely set accordingly.

Further, of the ribs 11, 12, 13,..., Which are located substantially at the center of the rear surface 3, the maximum height C and the maximum width D of the ribs 11, adjacent ribs 12, 13
..., 19, 20 maximum heights C ', C "and maximum widths D
′, D ″ are formed smaller in order, so that the ribs 11 arranged side by side are located at a substantially central portion where a large strength is required when hitting a golf ball.
The ribs 12 and 13 adjacent to the outside of the rib 11 can be formed small so that the optimum arrangement of the ribs 11 can be obtained. As a result,
As the heel 9 and the top 10 are closer to the side of the heel, there is no useless portion in the ribs 12, so that the weight distribution of the head can be set freely.

Moreover, since the ribs 11 are formed simultaneously by forging when forming the head body 1,
Since the continuous flow lines from the face 2 exist in the ribs 11, the strength of the ribs 11, and thus the strength of the head, can be improved.

The present invention is not limited to the above embodiment, and various modifications are possible, for example, the cross section of the rib may be rectangular or triangular.

[0017]

According to the present invention, there is provided an iron-type golf club in which a shaft is connected to an iron-type golf club head having a plurality of ribs provided on a back surface of a face provided with a face groove. Projections are provided annularly along the edge and form a sole, and the ribs are juxtaposed at intervals so as to be substantially perpendicular to the direction of the face groove. The height and width of the upper and lower parts are formed gradually smaller than the height and width, and the ribs adjacent to the outside of the ribs are determined by the maximum height and the maximum width of the rib located at the approximate center of the back surface among the adjacent ribs. By forming the maximum height and the maximum width sequentially smaller, the iron-type golf club is characterized by increasing the rib portion corresponding to the portion requiring strength when hitting a golf ball, To reduce the rib portion corresponding to the intensity is relatively small portion when hit Lumpur, achieving optimum thinning in the ribs, the weight distribution of the results head can be set more freely.

[Brief description of the drawings]

FIG. 1 is a rear view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a rear perspective view showing an embodiment of the present invention.

FIG. 4 is a sectional view taken along line XX of FIG. 1;

FIG. 5 is a sectional view taken along line YY of FIG. 1;

FIG. 6 is a sectional view taken along line ZZ of FIG. 1;

[Explanation of symbols]

 2 face 6 face groove 11 12 13 14 15 16 17 18 19 20 21 rib 11A central part 11B upper part 11C lower part C height D width

Claims (1)

(57) [Claims] 1. An iron-type golf club in which a shaft is connected to an iron-type golf club head in which a plurality of ribs are provided on a back surface of a face provided with a face groove, wherein a protrusion projecting rearward is provided around the back surface. The sole is provided annularly along the edge and forms a sole, and the ribs are juxtaposed at intervals so as to be substantially perpendicular to the direction of the face groove. The height and width of the upper and lower parts are made smaller gradually, and the maximum height of the rib adjacent to the outside of the rib is larger than the maximum height and maximum width of the rib located at the approximate center of the back surface among the adjacent ribs An iron-type golf club, wherein the maximum width is sequentially reduced.