JP7091089B2 - Iron head - Google Patents

Description

The present invention is an iron head for a golf club with a low center of gravity that can improve the directional stability and flight distance of the ball at the time of hitting, and the weight is different for each golfer to obtain a well-balanced iron head. Multiple different types of metals are used to create multiple screws for weight adjustment of the same shape, and one of the above can be used for weight adjustment at an iron head manufacturer or golf equipment store, depending on the wishes of each golfer. In the lower part of the hosel part, the screw is screwed and fixed in the bottomed screw hole formed at the extension line position of the shaft of the heel part to which the hosel part is connected, and the golfer's wishes without changing the position of the center of gravity. It is related to iron heads that can be provided as a new product according to the golfer's wishes, while the weight can be adjusted according to the situation to provide a well-balanced iron head.

Conventionally, as iron heads for golf clubs, those made of forging or lost wax are known. However, these conventional iron heads have a substantially triangular cross section, as disclosed in Japanese Patent Application Laid-Open No. 2-410007 below, for the purpose of improving the directional stability and flight distance of the ball at the time of hitting. A ceramic core in which a holding pin is integrally projected is arranged so as to cover substantially the entire face surface and back surface of the iron head, and an iron head formed integrally with the iron head body by a lost wax manufacturing method is known. As disclosed in Japanese Patent Application Laid-Open No. 2-206481 of Patent Document 2 below, a metal piece for lowering the center of gravity made of a metal material having a large specific gravity is placed on the sole portion (bottom portion) of the iron head, and a lost wax manufacturing method is used. An iron head formed by forging after molding is known, and further, as disclosed in Japanese Patent Application Laid-Open No. 5-15621 of Patent Document 3 below, a toe portion and a sole portion to a hosel are located in the vicinity of the sole portion of the iron head. An insert member made of a sintered body such as ceramics, in which a mass portion is appropriately formed in the portion and the toe portion and the sole portion are connected to each other by ribs, is arranged, and is made of lost wax integrated with a head body of any metal. Iron heads are known.

And, in particular, in the current situation, in order to make the iron head used by the golfer himself an iron head with a balanced weight of his choice, lead is attached to the back face of the iron head with an adhesive, or the toe side. The weight and balance of the iron head were adjusted by making the golfer heavier or inserting and fixing a pile or lead to the lower end of the shaft to be inserted into the hosel.

Jitsufuku No. 2-410007 Japanese Unexamined Patent Publication No. 2-206481 Japanese Unexamined Patent Publication No. 5-15621

The iron head described in Patent Document 1 has a ceramic core having a substantially triangular cross section and having a holding pin integrally projected thereof, and is arranged so as to cover substantially the entire face surface and back surface of the iron head, and is made of a metal outer shell. Since it is in the form of being wrapped, the weight distribution becomes the peripheral part of the head and the sweet spot expands, but it is difficult to provide a head with a low center of gravity in terms of weight distribution, and alumina or as a ceramic core Since zirconia is used, the expansion coefficient is different from that of the metal head body, so a gap is created between the ceramic core and the metal head body, which reduces the strength and damages the ball. There was a problem that it became a cause.

Further, the iron head described in Patent Document 2 is an iron head formed by forging after arranging a metal piece for lowering the center of gravity made of a metal material having a large specific gravity on the sole portion (bottom portion) of the iron head and molding it by a lost wax manufacturing method. Therefore, a metal piece for lowering the center of gravity made of a metal material with a large specific gravity is placed on the sole (bottom) of the iron head, and the head is taken in the metal for lowering the center of gravity by the lost wax manufacturing method. Although it is formed, it is difficult for the material of the metal piece for lowering the center of gravity to be used and the expansion coefficient of the material of the head body to match, so a gap is inevitably created between the two, and if forging is performed by a forging mold in that state, it will be inside. Since the iron head is formed with a gap left, the position of the metal piece for lowering the center of gravity becomes unstable, and the weight distribution of the head itself changes slightly, so it is difficult to provide the iron head as designed. There was a challenge.

Furthermore, the iron head described in Patent Document 3 is invented to solve the problems of the iron head described in Patent Documents 1 and 2, but is similar to the iron head described in Patent Documents 1 and 2. , An insert member made of a sintered body such as ceramics, which is a different material from the iron head body, is placed, and the iron head is formed by integrating with the head body of any metal. A process for integration is required, and it takes time and effort to create an iron head, which causes a problem that the price becomes high.

Furthermore, in order to make the iron head used by the golfer himself a well-balanced iron head of his choice, lead is attached to the back face of the iron head, or a stake is placed at the lower end of the shaft to be inserted into the hosel portion. Although it may be possible for a skilled golfer to insert and fix lead or the like, there is a problem that it is difficult for a general golfer.

Further, both the head described in Patent Documents 1 to 3 and the head improved by the golfer himself have a result that the position of the center of gravity shifts, and the club moves abnormally at the time of hitting a ball, so that an accurate shot can be obtained. There was a problem that it could not be done.

The present invention has been made to solve the above-mentioned problems, and has a bottomed screw hole formed at an extension line position of a shaft of a heel portion to which the hosel portion is connected in the lower portion of the hosel portion of the iron head. , One of the four types of weight adjustment screws formed in the same shape with the same length and screw diameter from four types of metals with different weights, titanium, aluminum, iron, and tungsten, for weight adjustment. By screwing and fixing the screw to make the weight of the iron head the weight desired by the golfer, and then inserting and fixing the shaft to the hosel portion, the weight and balance desired by the golfer are provided without changing the position of the center of gravity. It is intended to provide an iron head that can be used as an iron golf shaft.

In the present invention, in the lower portion of the hosel portion of the iron head , titanium, aluminum, iron, and tungsten having different weights are provided in the bottomed screw holes formed at the extension line position of the shaft of the heel portion to which the hosel portion is connected. Of the four types of weight adjustment screws formed of the same type of metal with the same length and screw diameter, one of the weight adjustment screws is screwed in and fixed, and the shaft is attached to the hosel portion. The above problem was solved by adopting the means of inserting and fixing the screw.

According to the iron head of the present invention having the above configuration , four types of weight adjusting screws each having the same length and screw diameter formed by four types of metals having different weights in advance, such as titanium, aluminum, iron, and tungsten. In order to obtain the iron head weight desired by the golfer, select one of the four types of weight adjusting screws from the above four types of weight adjusting screws, and use the selected weight adjusting screws. , In the lower part of the hosel part of the iron head, screw and fix it in the bottomed screw hole formed at the extension line position of the shaft of the heel part to which the hosel part is connected, and set the weight of the iron head to the weight desired by the golfer. After that, by inserting and fixing the shaft to the hosel portion, it is possible to provide a well-balanced iron head with the weight desired by the golfer without changing the position of the center of gravity, while changing the weight of the iron head being used by the golfer. If you wish, bring the iron head you are using to a manufacturing company or a golf equipment store, and if the golfer wishes, screw and fix one of the above weight adjustment screws into the screw hole. The weight can be adjusted according to the golfer's wishes to provide a well-balanced iron head, and the manufacturer can also quickly and repeatedly offer a new product with a weight according to the golfer's wishes. It works.

It is sectional drawing which shows by notifying a part of the iron head of this invention. It is a perspective view of the weight adjustment screw used for the iron head of this invention.

Golfers use an iron head with a well-balanced low center of gravity in order to improve the directional stability and flight distance of the ball when hitting a ball. Especially for golfers with a long history of golf, the weight of the iron head is only about 1 g. On the other hand, the difference in the weight of the iron head affects the direction stability and flight distance of the ball at the time of hitting, so for golfers who enjoy golf, which is said to be a mental sport, the weight of the used iron head can be used. The present invention was made with the idea that the best score could be achieved if it could be easily adjusted. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a part of the iron head of the present invention cut out. Above the heel portion 2 of the base end portion of the iron head 1 shown in the figure, a hosel portion 5 provided with a hollow portion 4 for inserting and fixing the front end portion of the shaft 3 is projected and continuously provided. .. Then, in the lower portion of the hosel portion 5, a weight adjusting screw 6 for adjusting the weight of the iron head 1 is screwed and fixed at an extension line position of the shaft 3 of the heel portion 2 to which the hosel portion 5 is connected. A bottomed screw hole 7 in which a female screw is recessed is formed.

Further, the weight adjusting screw 6 screwed and fixed in the screw hole 7 is, for example, as shown in FIGS. 1 and 2, the weight adjusting screws 6a to 6d are all made of four kinds of metals having different weights and have the same shape. A male screw 8 that can be screwed into the female screw of the screw hole 7 is provided around the outer circumference, and a screwdriver (not shown) is inserted into the head 9 from the opening 10 above the hosel portion 5. Then, an engaging portion 11 such as a plus, minus, or socket that engages with the cutting edge of the tip of the screwdriver is provided so that the screw can be screwed into the screw hole 7.

The weight adjusting screws 6a to 6d are formed of a plurality of screws 6a to 6d having the same shape using a plurality of types of metals having different weights. The metal used as the material for the weight adjusting screws 6a to 6d is titanium , aluminum , iron, and tungsten. As for the weight of each of the four types of metals described above, titanium is the lightest, and then aluminum, iron, and tungsten are heavier in this order.

As an example of the weight adjusting screws 6a to 6d, for example, when a weight adjusting screw having a total length of 5 to 7 mm and a screw diameter of 1 to 3 mm is manufactured using each of the above materials, titanium is 0.5 to 6 It is recommended to use 0.0 g, aluminum in the range of 0.5 to 3.0 g, iron in the range of 1.0 to 10.0 g, or tungsten in the range of 2.0 to 15.0 g, respectively.

As described above, among the plurality of weight adjusting screws 6a to 6d formed in the same shape by a plurality of types of metals having different weights, as shown in FIG. 1, for example, the weight adjustment desired by the golfer. The screwdriver 6a is selected, the engaging portion 11 of the head portion 9 of the selected weight adjusting screw 6a is engaged with the cutting edge of the tip of the screwdriver, and the screwdriver is opened from the opening 10 above the hosel portion 2. Is inserted into the screw hole 7 to screw and fix the weight adjusting screw 6a, and then the shaft 3 is inserted into the hosel portion 5 and integrally fixed to the hosel portion 5. The iron head 1 is formed.

1 Iron head 2 Heel part 3 Shaft part 4 Hollow part 5 Hosel part 6a to 6d Weight adjustment screw 7 Thread hole 8 Male screw 9 Head 10 Opening 11 Engagement part

Claims (1)

In the lower part of the hosel part of the iron head, the bottomed screw hole formed at the extension line position of the shaft of the heel part to which the hosel part is connected is made of four kinds of metals of different weights, titanium, aluminum, iron and tungsten. Of the four types of weight adjustment screws formed in the same shape with the same length and screw diameter, one of the weight adjustment screws is screwed and fixed, and the shaft is inserted and fixed to the hosel portion. An iron head that features that.

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