CN106457028A - Golf club set - Google Patents

Abstract

The invention provides a golf club set, which can obtain a stable swing feeling suitable for a player regardless of the number of golf clubs. The inertia moment of the grip of the golf clubs is almost constant regardless of the number. The head moments of inertia of the plurality of golf clubs decrease as the numbers thereof become larger. The shaft inertia moment of the plurality of golf clubs increases as the number thereof becomes larger. Since the decrease amount of the head moment of inertia and the increase amount of the shaft moment of inertia are substantially cancelled out, the club moments of inertia of the plurality of golf clubs are substantially the same. The shaft weight of the multiple golf club shaft constituting the multiple golf club increases as its number becomes larger, and the shaft center of gravity position moves toward the shaft front end side.

Description

golf club set

technical field

This invention relates to golf club sets.

Background technique

A set of golf clubs (eg, a set of irons) has a plurality of golf clubs that are numbered differently (eg, from a five iron to a ten iron). Typically, golf clubs with different numbers differ in length and overall club weight (shaft length and head weight).

Generally, with regard to the existing golf club set, the shaft and the head are selected and assembled so that the swing weights (swing balance) of all numbers with different lengths and club total weights are substantially the same. Swing weight is a numerical value indicating the feeling of use of the head of the golf club (the ease of feeling the weight of the head when swinging or shaking). The heavier the golf club is, the easier it is to feel the weight of the head. The lighter the golf club, the harder it is to feel the weight on the head.

Club moment of inertia (MOI [kg·cm ² ]) is known as an index different from swing weight. The moment of inertia of the club is defined as the sum of moments of inertia of the head, the shaft, and the grip from the end of the grip, and is used as an index indicating the swing feeling of the golf club. It is said that the general tendency is that the larger the moment of inertia of the club, the harder it is to swing, and the smaller the moment of inertia, the easier it is to swing.

prior art literature

patent documents

Patent Document 1: Japanese Patent Application Laid-Open No. 11-285550

Patent Document 2: Japanese Patent Laid-Open No. 2001-87424

Contents of the invention

(problem to be solved by the invention)

The inventors of the present application paid attention to the fact that the moment of inertia of the club (MOI [kg·cm ² ]) was used as a new index common to golf club sets instead of using an index for a single golf club, and completed the present invention. If this is the case, the swing easiness of each golf club in the golf club set can be made uniform. That is to say, the inventors of the present application have found that, in terms of the moment of inertia of the club, compared with the size of each individual golf club (needless to say), the uniformity of the golf club set as a whole is evaluated as more important to the golfer. The golf club set which is easy to swing.

It is difficult to make the moments of inertia of the clubs uniform in the conventional golf club sets that are trying to make only the swing weights uniform. Each golf club in the conventional golf club set with the same swing weight has a club moment of inertia (MOI [kg·cm ² ]) that becomes smaller (larger) as its serial number becomes larger (smaller). That is to say, it is true that the moment of inertia of the club (that is, the feeling of swing) changes according to the number of the golf club in the conventional golf club set. This is presumed to be one of the reasons for the lack of proficiency (particularly, the lack of proficiency in small numbered clubs) due to numbering.

The present invention has been made based on the above problem awareness, and an object of the present invention is to obtain a golf club set capable of obtaining a stable swing feeling suitable for a golfer regardless of the number of the golf club.

(Technical solutions to technical problems)

As a result of intensive research, the inventors of the present application found that, regardless of the general tendency that the greater (smaller) the moment of inertia of the club is, the harder it is to swing (easy to swing), and when turning its attention to each golfer, in order to make the proficiency caused by the numbering different. In order to obtain a suitable and stable swing feeling without being good at it, it is important that the moments of inertia of the clubs are the same even if the numbers are different. The present invention was completed based on the concept of making the values of the club moment of inertia uniform among the golf clubs in the golf club set. Of course, the value itself of the moment of inertia of the club also varies from player to player.

The golf club set of the present invention has a plurality of golf clubs with different numbers. It is characterized in that the moments of inertia of the grips of the plurality of golf clubs have nothing to do with their numbers and are approximately fixed; the moments of inertia of the head of the plurality of golf clubs decrease as their numbers increase; the plurality of golf clubs The shaft moment of inertia of a club increases as its number becomes larger; the decrease in the head moment of inertia roughly cancels out the increase in the shaft moment of inertia, so the balls of the plurality of golf clubs The moment of inertia of the clubs is substantially the same; and the plurality of golf club shafts constituting the plurality of golf clubs has an increased shaft weight as the number thereof increases, and the position of the center of gravity of the shafts moves toward the shaft tip side.

Preferably, when one of the plurality of golf clubs is selected as a reference golf club, the reference golf club and any remaining golf clubs satisfy the following conditional formula (1):

(1) 0.995X<Y<1.005X

in,

X: club moment of inertia of the reference golf club (MOI [kg cm ² ]),

Y: club moment of inertia (MOI [kg·cm ² ]) of the remaining arbitrary golf club.

Preferably, the golf club set of the present invention also satisfies the following conditional formula (1') within the scope of the conditional formula specified by the conditional formula (1):

(1') 0.998X<Y<1.002X.

At least some of the plurality of golf club shafts have one or both of a metal cylinder and a metal foil whose weight increases as the number of the shafts increases on the tip side of the shafts.

The plurality of golf clubs may include at least six irons ranging from a five iron to a ten iron.

(effect of invention)

According to the present invention, there is obtained a golf club set capable of obtaining a stable swing feeling suitable for the golfer regardless of the number of the golf club.

Description of drawings

FIG. 1 is a conceptual diagram illustrating a golf club set and a golf club shaft set according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram for explaining a calculation method of a club moment of inertia of a golf club.

FIG. 3 is a diagram showing a detailed configuration of a No. 5 shaft.

FIG. 4 is a diagram showing a detailed configuration of a No. 6 shaft.

FIG. 5 is a diagram showing a detailed configuration of a No. 7 shaft.

FIG. 6 is a diagram showing a detailed configuration of a No. 8 shaft.

FIG. 7 is a diagram showing a detailed configuration of a No. 9 shaft.

FIG. 8 is a diagram showing a detailed configuration of a tenth shaft.

Fig. 9 is a comparative illustration of the moment of inertia of the club of the golf club set according to the present invention, the moment of inertia of the ball head of the golf club set of the present invention, and the conventional steel golf club set. A diagram of the moment of inertia of the club.

Fig. 10 is a diagram showing comparatively the shaft moment of inertia of the golf club set according to the present invention, the shaft moment of inertia of the existing steel golf club shaft set, and the existing carbon golf club shaft set. A diagram of the moment of inertia of the shaft.

FIG. 11 is a graph showing the weight of each shaft in the golf club shaft set according to the first aspect of the present invention and the weight of each shaft in the golf club shaft set according to the second aspect of the present invention. picture.

Symbol Description

5I Five Iron

5S fifth shaft

6I Six Iron

6S six shaft

7I Seven Iron

7S Seventh Shaft

8I Eight Iron

8S Eight Shaft

9I Nine Iron

9S No. 9 Shaft

10I(P) Ten iron (pitching wedge)

10S Tenth Shaft

MC metal cylinder

MF1, MF2 Metal foil.

detailed description

FIG. 1 is a conceptual diagram illustrating a golf club set and a golf club shaft set according to an embodiment of the present invention. In this conceptual diagram, the numbers of the golf clubs and the golf club shafts become larger (smaller) as they go from the left (right) to the right (left).

The golf club set of the present embodiment is an iron set including a fifth iron 5I, a sixth iron 6I, a seventh iron 7I, an eighth iron 8I, a ninth iron 9I, and a tenth iron (pitch) 10I(P). . Each iron is configured such that a head and a grip are respectively fixed to a front end portion and a base end portion of the shaft.

Symbols 5H, 5S, and 5G are assigned to the head, shaft, and grip constituting the five-iron 5I, respectively. Hereinafter, the shaft 5S is referred to as a fifth shaft.

Symbols 6H, 6S, and 6G are assigned to the head, shaft, and grip constituting the six-iron 6I, respectively. Hereinafter, the shaft 6S is referred to as a sixth shaft.

Symbols 7H, 7S, and 7G are assigned to the head, shaft, and grip constituting the seven-iron 7I, respectively. Hereinafter, the shaft 7S is referred to as the seventh shaft.

Symbols 8H, 8S, and 8G are assigned to the head, shaft, and grip constituting the eight-iron 8I, respectively. Hereinafter, the shaft 8S is referred to as an eighth shaft.

Symbols 9H, 9S, and 9G are assigned to the head, shaft, and grip constituting the nine-iron 9I, respectively. Hereinafter, the shaft 9S is referred to as a No. 9 shaft.

Symbols 10H, 10S, and 10G are assigned to the head, shaft, and grip constituting the ten-iron 10I, respectively. Hereinafter, the shaft 10S is referred to as a tenth shaft.

As described above, the golf club set according to this embodiment has the fifth shaft 5S, the sixth shaft 6S, the seventh shaft 7S, the eighth shaft 8S, the ninth shaft 9S, and the tenth shaft 10S. Hardcore shaft set.

Table 1 shows various parameters of the golf club set and the golf club shaft set of this embodiment.

The club length L decreases (decreases) as the number becomes larger.

Head weight W _H increases (increases) as the number becomes larger.

The shaft weight W _S increases (increases) as the number becomes larger.

The position of the center of gravity of the shaft GCL is represented by the position of the center of gravity of the shaft relative to the overall length of the shaft at several percent from the tip of the shaft. The position of the center of gravity of the shaft, GCL, gradually moves toward the tip of the shaft as the number increases (0.5% of the total length of the shaft for each size increase).

The grip weight W _G has nothing to do with the number and is fixed.

The club weight W _T increases (increases) as the number becomes larger.

【Table 1】

FIG. 2 is a conceptual diagram for explaining a calculation method of the club moment of inertia (MOI [kg·cm ² ]) of the golf club.

As shown in the figure, the club moment of inertia MOI _T of the golf club is calculated by the sum of the moments of inertia MOI _H , MOI _S , and MOI _G of the head, shaft, and grip constituting the golf club. (MOI _T ＝MOI _H +MOI _S +MOI _G )

The moment of inertia MOI _H of the head is calculated by multiplying the weight W _H of the head by the square of the distance L _H from the base end of the club to the position of the center of gravity of the head. (MOI _H ＝W _H ×(L _H ) ² )

The shaft moment of inertia MOI _S is calculated by multiplying the shaft weight W _S by the square of the distance L _S from the butt end of the club to the position of the center of gravity of the shaft. (MOI _S ＝W _S ×(L _S ) ² )

The moment of inertia MOI _G of the grip is calculated by multiplying the weight W _G of the grip by the square of the distance L _G from the base end of the club to the position of the center of gravity of the grip. (MOI _G ＝W _G ×(L _G ) ² )

Table 2 shows the club moment of inertia (MOI [kg·cm ² ]) of each golf club constituting the golf club set of this embodiment.

【Table 2】

As shown in Table 2, with regard to the golf club set of this embodiment, when one of the five-iron 5I to ten-iron 10I is selected as the reference golf club, the reference golf club and the remaining arbitrary The golf club satisfies the following conditional expression (1).

(1) 0.995X<Y<1.005X

in,

X: club moment of inertia of the reference golf club (MOI [kg cm ² ]),

Y: club moment of inertia (MOI [kg·cm ² ]) of the remaining arbitrary golf club.

That is to say, with regard to the golf club set of this embodiment, the moment of inertia of the clubs of the fifth iron 5I to the ten iron 10I is consistent within the range of ±0.5% when any golf club is used as a reference (compact ).

By satisfying the conditional expression (1), it is possible to obtain a stable swing feeling suitable for the golfer regardless of the number of the golf club.

Regardless of whether it is higher than the upper limit of the conditional expression (1) or lower than the lower limit, the variation in the moment of inertia of the club depending on the number of the golf club becomes too large, and it is difficult to obtain a stable swing feeling suitable for the golfer. .

The above-mentioned action and effect are more remarkably obtained by satisfying the following conditional formula (1'). This conditional expression (1') means that the club moments of inertia of the five-iron 5I to ten-iron 10I are consistent (intensive) within the range of ±0.2% with respect to any golf club.

(1')0.998X<Y<1.002X

In addition, as can be seen from Table 2, the following exists among the head moment of inertia MOI _H , the shaft moment of inertia MOI _S , the grip moment of inertia MOI _G , and the club moment of inertia MOI _T of the five-iron 5I to the ten-iron 10I. relation.

The moment of inertia MOI _G of the grip is fixed regardless of the number of the club (approximately fixed, but may deviate slightly).

The moment of inertia MOI _H of the head decreases as the number of the club increases.

The moment of inertia MOI _S of the shaft increases as the number of the club becomes larger.

In addition, for all club numbers, the decrease in the head moment of inertia MOI _H and the increase in the shaft moment of inertia MOI _S approximately cancel each other out, so the club moment of inertia MOI _T is approximately the same.

Focusing on the golf club shaft set and individual shafts, as the number of the fifth shaft 5S to the tenth shaft 10S increases, the weight of the shaft increases and the position of the center of gravity of the shaft moves toward the shaft tip side.

In order to achieve this, in the present embodiment, a technique of embedding a metal cylinder and a metal foil, which increase in weight as the number of the club increases, is adopted in the front end side of the shaft.

Hereinafter, detailed structures of the fifth shaft 5S to the tenth shaft 10S will be described with reference to FIGS. 3 to 8 . The fifth shaft 5S to the tenth shaft 10S are FRP (Fiber Reinforced Plastics: Fiber Reinforced Plastics) products formed by winding a prepreg material in which reinforcing fibers are impregnated with a thermosetting resin in multiple layers and thermally curing them.

The No. 5 shaft 5S to the No. 10 shaft 10S have prepregs P1, P2, P3, P4, P5, P6, P7.

The prepreg P1 is a front end partial layer wound around the front end of the shaft, and is a 0° prepreg whose fiber direction is parallel to the longitudinal direction of the shaft.

The prepregs P2 and P3 are full-length layers wound around the entire length of the shaft, and are twill prepregs whose fiber directions are symmetrical (±45° in this embodiment) with respect to the longitudinal direction of the shaft.

The prepregs P4, P5, and P6 are full-length layers wound around the entire length of the shaft, and are 0° prepregs whose fiber direction is parallel to the length direction of the shaft.

The prepreg P7 is a front end partial layer wound around the front end of the shaft, and is a 0° prepreg whose fiber direction is parallel to the longitudinal direction of the shaft.

The fifth shaft 5S to the tenth shaft 10S have a metal cylinder MC embedded in the shaft tip portion of the innermost layer. Metal cylinder MC is made of materials such as iron, aluminum, and tungsten, for example. The weight of the metal cylinder MC increases as the number of the club increases (4.95g for the fifth shaft 5S, 5.50g for the sixth shaft 6S, 6.05g for the seventh shaft 7S, and 6.05g for the eighth shaft 6.60g for the 8S shaft, 8.25g for the 9S shaft, and 10.45g for the 10S shaft).

The fifth shaft 5S to the tenth shaft 10S have the metal foil MF1 interposed between the prepreg P3 and the prepreg P4 as a front end partial layer wound around the front end of the shaft.

Eighth to tenth shafts 10S have, in addition to the metal foil MF1 , a metal foil MF2 interposed between the prepregs P4 and P5 as a front end partial layer wound around the front end of the shaft.

Metal foil MF1 and metal foil MF2 are made of materials such as copper, stainless steel, and aluminum, for example.

Metal foil (metal foil MF1 in the fifth shaft 5S to seventh shaft 7S, metal foil MF1 and metal foil MF2 in the eighth shaft 8S to tenth shaft 10S) changes with the club number Large and its weight increases (1.07g in the 5th shaft 5S, 1.91g in the 6th shaft 6S, 2.87g in the 7th shaft 7S, 4.41g in the 8th shaft 8S, 5.99g in the No. 9 shaft 9S and 7.69g in the No. 10 shaft 10S).

According to the technology using the metal cylinder MC and metal foil MF1 and metal foil MF2, the weight of the shaft and the position of the center of gravity of the shaft can be set relatively freely regardless of the number of the club, so the ball of the entire golf club set can be adjusted. The moment of inertia of the rod is approximately constant (uniform). The applicant of the present application filed patent applications and acquired patent rights for inventions related to such technologies (for example, JP-A-2012-110498, JP-A-2013-220285, JP-A-4880063, etc.).

Fig. 9 is a comparative illustration of the moment of inertia of the club of the golf club set according to the present invention, the moment of inertia of the ball head of the golf club set of the present invention, and the conventional steel golf club set. A diagram of the moment of inertia of the club.

Table 3 and Table 4 are tables corresponding to Table 1 and Table 2 showing conventional steel golf club sets.

【table 3】

【Table 4】

As shown in Figure 9 and Tables 3 and 4, in the existing steel golf club set, the shaft weight _WS and the center of gravity position GCL of the shaft are fixed regardless of the number of the club. becomes larger and the moment of inertia of the club decreases. In contrast, according to the golf club set of the present invention, as the number becomes larger and the shaft weight increases and the position of the center of gravity of the shaft moves toward the front end side of the shaft, the club moment of inertia of the clubs of all the numbers is substantially constant. The same way (intensive).

Fig. 10 is a diagram showing comparatively the club moment of inertia of the golf club shaft set according to the present invention, the club moment of inertia of the conventional steel golf club shaft set, and the conventional carbon golf club shaft. Diagram of the shaft moment of inertia of the shaft group.

Table 5 and Table 6 are tables corresponding to Table 1 and Table 2 showing conventional carbon golf club sets.

【table 5】

【Table 6】

As shown in Figure 10 and Tables 5 and 6, the moment of inertia of the shaft shaft decreases as the number of the club becomes larger for the existing steel golf club shaft set and the existing carbon golf club shaft set. decrease. In contrast, according to the golf club shaft set of the present invention, the moment of inertia of the shaft increases as the number of the club increases. Made of golf club shaft set completely opposite characteristics.

Fig. 11 shows comparatively the weight of each shaft in the golf club shaft set according to the first aspect (above-mentioned aspect) of the present invention and the weight of each shaft in the golf club shaft set according to the second aspect of the present invention. Diagram of the weight of the shaft.

Table 7 and Table 8 are tables corresponding to Table 1 and Table 2 showing the golf club set according to the second aspect of the present invention.

【Table 7】

【Table 8】

According to the golf club set according to the second aspect of the present invention, as the number of the golf club increases, the weight of the shaft increases, and the position of the center of gravity of the shaft moves toward the base end side of the shaft (the grip side). In addition, by greatly increasing the amount of increase in shaft weight for each number, the club moments of inertia of all the club numbers are substantially uniform (intensified).

In this second aspect, compared with the first aspect, the weight of golf club shafts and golf clubs with larger numbers becomes extremely large, and the weight difference between golf club shafts and golf clubs with different numbers becomes smaller. extremely large.

That is to say, in the first method, since both the weight of the shaft and the position of the center of gravity of the shaft are changed for each number with an exquisite adjustment amount, compared with the second method, it is possible to use a golf club with a larger number. And the weight of the golf club is controlled to be small, and the weight difference between golf club shafts and golf clubs with different numbers can be controlled to be small. (It can be said that the first method is more excellent than the second method at this point).

However, even in this second form, the club moments of inertia of all the numbered clubs are substantially uniform (consolidated), and therefore, regardless of the number of golf clubs, it is possible to obtain a suitable stability for the golfer. swing feel.

In the above embodiments, the case where the golf club set and the golf club shaft set of the present invention are applied to the iron set and the iron shaft set has been exemplified. However, the golf club set and the golf club shaft set of the present invention can also be applied to a wood set and a wood shaft set in the same way.

In the above embodiments, the case where the golf club set and the golf club shaft set of the present invention are applied to six irons and iron shafts from the five irons to the ten irons has been exemplified. However, the golf club set and the golf club shaft set of the present invention can be applied to a plurality of golf clubs and golf club shafts having different numbers. For example, it is also possible to use the following method: in addition to the six iron clubs and iron shafts from the 5th iron to the 10th iron (or instead of the six iron clubs and the iron shafts from the 5th iron to the 10th iron) ), you can use five irons from the zero iron to the fourth iron and part or all of the iron shafts.

In the above embodiments, the case where the metal cylinder and the metal foil, whose weight increases as the number becomes larger, is embedded in the tip sides of the shafts of a plurality of golf clubs is exemplified, but only the metal cylinder and the metal foil may be embedded Either of the metal cylinder and the metal foil. Alternatively, neither the metal cylinder nor the metal foil is buried in the fifth iron and the six iron, but the metal cylinder and metal foil that increase in weight as the number increases are embedded in the seven irons to ten irons. At least one side of the metal foil is by way.

(Industrial Utilization Possibility)

The golf club set according to the present invention is suitably used in the industrial field of golf club shafts, golf clubs, and golf club sets.

Claims (4)

1. A golf club set comprising a plurality of golf clubs having different numbers, each golf club being constructed by fixing a head and a grip to a front end and a base end of a shaft respectively, the golf clubs The group is characterized by, The moments of inertia of the grips of the plurality of golf clubs have nothing to do with their serial numbers, and are roughly fixed; head moments of inertia of the plurality of golf clubs decrease as their numbers increase; The moments of inertia of the shafts of the plurality of golf clubs increase as their numbers become larger; the decrease in head moment of inertia substantially cancels the increase in shaft moment of inertia such that the plurality of golf clubs have approximately the same club moment of inertia; and The plurality of golf club shafts constituting the plurality of golf clubs increases in weight as the number of the golf clubs increases, and the position of the center of gravity of the shafts moves toward the tip side of the shafts. 2. The golf club set of claim 1, wherein: When one of the plurality of golf clubs is selected as a reference golf club, the reference golf club and any remaining golf clubs satisfy the following conditional formula (1): (1) 0.995X<Y<1.005X in, X: club moment of inertia of the reference golf club (MOI [kg cm ² ]), Y: club moment of inertia (MOI [kg·cm ² ]) of the remaining arbitrary golf club. 3. The golf club set of claim 1 or 2, wherein: At least some of the plurality of golf club shafts have one or both of a metal cylinder and a metal foil whose weight increases as the number of the shafts increases on the tip side of the shafts. 4. The golf club set according to any one of claims 1 to 3, wherein: The plurality of golf clubs includes at least six irons from a 5th iron to a 10th iron.