JP2005304679A - Club, club set and grip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily select a club according to the body and the muscle force of a golfer, swing even a different number club in a similar sense, and adjust the characteristics of a selected club. <P>SOLUTION: This club 1 comprises a head 2, a shaft 3, and a grip 4, the value of the whole length of the club is defined as L, the value of the whole mass of the club is defined as W, the value of the dimension from the position of the gravity center of the club to the grip end is defined as a balance arm A, a value of the length from the gravity center position of the club till a position obtained by subtracting a predetermined dimension from the grip end is defined as Aj, a value of the product of the square of Aj and the whole mass W of the club is defined as a swing balance M, and at least two values out of the respective values including M are combined to be displayed on a label 10 in a code or a numerical value. In especially, the grip 4 is formed with a mark by cutting a part and adjusting the mass in the end 4a of the shaft side or the numerical value 4c indicating the mass of the left part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a club and a club set that can easily select a club adapted to a golfer's physical strength or skill, and a grip that can be easily adjusted to adapt to the golfer's physical strength or skill. It is.

  Golf has a large competitive population, regardless of gender and age, regardless of professional or amateur. Therefore, various golfers having a wide range of physical strength and skill play in the golf competition. In other words, many people, from professional golfers with the highest physical strength, strength or skill, to amateur golfers with inferior physical strength, strength and skill, play golf competitions. It is required to use.

  For example, as a main method for extending the flight distance of the ball, there is a method of increasing the mass of the head or increasing the head speed at the moment of impact. Increasing the mass of the head increases the mass of the club, making it difficult to swing heavy and good, and it is effective to use a flexible shaft to increase the head speed. The problem arises that it becomes difficult to control the flight direction of the hit ball.

  From the above viewpoint, a golfer with strong body strength and muscular strength can select a club with a small shaft deflection and increase the head speed with his own force, thereby extending the flight distance of the hit ball. In such a club, the mass of the shaft is large, and the ratio of the mass of the head to the total mass is small. In addition, a golfer with weak body strength and muscle strength can select a club with a large shaft deflection, increase the head speed by restoring the shaft deflection accompanying the swing, and extend the flight distance of the hit ball. In such a club, the mass of the shaft is small, and the ratio of the mass of the head to the total mass is large.

  At present, as an index representing club characteristics, there is a swing weight display by Kenneth Smith, which is widely used. In this display, the weight obtained by measuring the degree of handedness based on a certain standard is called a swing weight, and is represented by a symbol (generally, 30 levels of symbols ranging from C0 to E9). This principle represents the value of moment obtained by multiplying the length of the distance from the position of 14 inches (about 36.5 cm) from the grip end to the position of the center of gravity of the club by the mass of the club. Some shafts constituting the club are engraved with an index for mass, bending condition, and the like.

  The condition for a golfer to perform an effective swing is whether or not the body and muscle strength and the club combining the head, shaft, and grip are optimally matched. That is, it is necessary to select an optimum club for a less powerful golfer, and it is necessary to select an optimum club for a stronger golfer.

  However, the above-mentioned Kenneth Smith's swing weight display shows a static balance and does not take into account the conditions for swinging. For this reason, when a golfer actually swings with a club, there is a problem that it does not fit the golfer's sense.

  An object of the present invention is a club set that can be easily selected according to a golfer's physical strength, muscle strength, and skill, and a club set that can swing with a similar feeling even in clubs of different numbers, It is an object of the present invention to provide a grip that can further adjust the specifications of a selected club.

  In order to solve the above problems, a golf club according to the present invention is a golf club comprising a head, a shaft, and a grip, wherein the total length of the club is L, the total mass of the club is W, and the center of gravity of the club The value of the dimension from the position of the grip to the end of the grip is A, and the length from the center of gravity of the club to the position obtained by subtracting a certain dimension from the end of the grip is Aj, and the square of Aj and the total mass W of the club The product value is M, and at least two values including M are combined and displayed as symbols or numerical values.

  The golf club set includes a plurality of golf clubs including a head, a shaft, and a grip, and excludes the putter. The total mass of each club is W, and the position from the center of gravity of each club to the end of the grip. The dimension value is A, the length value from the center of gravity of each club to the position obtained by subtracting a certain dimension from the grip end is Aj, and the product of the square of Aj and the total mass W of the club is M. The value M for each of the plurality of clubs is configured such that the proportional constant of the dimension value A from the center of gravity of the club to the grip end is a positive linear function, and the value of the proportional constant is It is displayed with a symbol or a numerical value.

  Further, in the grip of a golf club, a part of the grip is cut off at the tip end side of the grip which has started to be wound from the other end of the shaft insertion side or the shaft head side to adjust the mass of the grip. A symbol or number representing the mass of the mark or the remaining portion or the portion to be cut is formed.

  The other grip is formed by winding a sheet selected from a plurality of sheet groups having different masses and each having at least a mass displayed around the shaft.

  In the golf club according to the present invention (hereinafter simply referred to as “club”), in addition to the length L and mass W of the club, the value A of the dimension from the center of gravity of the club to the end of the grip, A value M (swing balance) of a product of a total value Wj of a club to a position obtained by subtracting a certain dimension from the square of a total weight W of the club and a length Aj from a center of gravity of the club to a position obtained by subtracting a certain dimension from the grip end. By selecting at least two values including M selected from the above and displaying them as symbols or numerical values, when selecting a club, the club length and mass, or a measure of balance when swinging is known. I can do it.

  The above values are not based on the golfer's physical strength, muscle strength, or skill, but based on values such as the mass of the club, the position of the center of gravity, and the length. For this reason, it is possible for the golfer to know the static characteristics of the club, including length and mass, and dynamic characteristics such as balance during swing, from the displayed symbols and numerical values. It is possible to easily select a club according to the muscle strength and skill.

  In the club set according to the present invention, the swing balance value M for each club is arranged on a straight line composed of a substantially linear function whose proportionality constant is positive with respect to the length A from the center of gravity of the club to the grip end. Even clubs with different counts can swing well with almost the same feeling.

  Since the grip according to the present invention is configured so that the mass can be adjusted by cutting in the length direction, the mass W of the entire club, the position A of the center of gravity of the club, and the swing balance can be obtained by appropriately cutting the grip. M can be adjusted. That is, the value of A can be increased by reducing the weight by appropriately cutting the grip. As a result, the swing balance value M also changes greatly, and an optimum club can be realized depending on the golfer.

  Also, with other grips, the grip mass can be optimized by selecting a sheet having a required mass and thickness from a plurality of sheet groups having different masses and winding them around the shaft. For this reason, an optimum club can be realized by adjusting the value of the swing balance.

  Hereinafter, preferred embodiments of the club, the club set, and the grip according to the present invention will be described.

  In the club according to the present invention, the criteria for selection by the golfer are: a length value L of the club itself, a total mass value W, and a load M (swing balance) value M when swinging. It is a combination of at least two values including M among the multiple values included, and is displayed as a symbol or numerical value. By displaying the specifications of the club itself and the dynamic characteristics during the swing, the golfer himself The most suitable club can be selected in consideration of the physical strength, muscle strength, and skill of the child.

  In the club set according to the present invention, the swing balance M of a plurality of clubs excluding the putter is such that the proportionality constant is a substantially linear function with respect to the length A from the center of gravity of the club to the grip end. Yes, even when a golfer uses a club with a different count, the golfer can swing with almost the same feeling.

  Furthermore, the grip according to the present invention can be adjusted by cutting a part and adjusting the mass, or by selecting a sheet having an optimum mass from a plurality of sheet groups having different masses and winding the shaft around the shaft. The club mass W and swing balance M can be adjusted based on the golfer's sense of swing, and a smoother swing is realized by finely adjusting the club selected by the golfer. It is possible.

  First, the club will be described. FIG. 1 is a diagram for explaining dimensional conditions of a club. In the figure, the club 1 includes a head 2, a shaft 3, and a grip 4, and is configured to be able to be combined with each other. Further, although an iron club is described as club 1 in the figure, in the present invention, it is not asked whether the club is an iron, wood, or what number, and any club except the putter is used. However, the same application is possible.

  The position of the point 5 shown in the figure is the center of gravity of the club 1, and is the position where the total mass W (gram, g) of the club 1 acts. Therefore, with respect to the point 5, the mass on the head 1 side and the mass on the grip 4 side are equal. When the mass of the grip 4 is changed in this state (when the mass of the grip 4 is decreased), the mass on the grip side is relatively decreased from the point 5, and as a result, the position of the point 5 is substantially moved to the head 2 side. Will move. That is, it is possible to change the position of the center of gravity 5 as the mass of the grip 4 changes. Reference numeral 6 denotes an end on the shaft side of the hand when the golfer grips the grip 4, and the position is 20 cm from the end of the grip 4 regardless of the body of the golfer.

  A is a distance from the point 5 to the end of the grip 4, that is, a distance (centimeter, cm) from the center of gravity to the grip end, and is hereinafter referred to as a balance arm A. G is a length when the golfer grips the grip 4 and is about 20 cm although it varies depending on the body of the golfer. Therefore, it is set to 20 cm (constant) from the grip end as described above, and is hereinafter referred to as a grip length G. Therefore, Aj is a dimension (cm) obtained by subtracting the grip length G from the length A from the center of gravity to the grip end, and is hereinafter referred to as a swing arm Aj. Further, L is the length (cm) from the grip end to the sole surface of the head that properly grounds the head, and is hereinafter referred to as the total length L. Lj is a length (cm) obtained by subtracting the grip length G from L, and is hereinafter referred to as an effective length Lj.

First, consider the load on the body of the club during the swing. The load that the golfer feels during the swing is not a static load at the time of addressing, but a rotational moment that is a dynamic load associated with the swing of the club 1. This rotational moment is obtained by the product of the mass W of the club 1 and the square of the swing arm Aj which is the length from the point 5 which is the center of gravity to the position 6 in the grip 4. That is, the rotational moment is a value obtained by W · Aj · Aj (g · cm ² ), and this value is hereinafter referred to as swing balance M.

  The greater the value of the swing balance M, the greater the burden on the golfer when accelerating the head 1. In general, the sense of load of the club 1 during a swing is a sense of whether or not the swing balance M of the club 1 is appropriate for the golfer's own physical strength, muscle strength or skill. That is, when it is felt that the body is burdened during the swing, it can be said that the club 1 is an inappropriate club if the swing balance M is too large for the golfer.

  Here, the combination of the head 2, the shaft 3 and the grip 4 in the club 1 preferable for the golfer will be considered from the viewpoint of mass and size.

  The mass (H) of the head 2 occupies about 65% to 80% of the mass W of the club 1 and affects the flight distance of the ball. Further, the shape of the head 2 affects the controllability in the flight direction. In order to increase the flight distance of the ball, it is necessary to increase the mass H of the head 2. However, if the mass of the head 2 becomes too large, the value of the swing balance M becomes too large, which causes a problem that a smooth swing is hindered.

  The shaft 3 has a function of transmitting the rotation of the golfer's body to the head 2 via the grip 4. In particular, it has sufficient deflection and kick points to increase the head speed, pulling force according to the centrifugal force acting on the head during the swing, bending due to the inertia force of the head during the downswing, impact The reaction force against the momentary impact or twist is transmitted to the grip 4. As the shaft 3 having such a function, it is preferable that the shaft 3 is light in weight and has an appropriate amount of bending, and it is preferable that the twist at the time of impact is small.

  The mass of the shaft 3 differs depending on the selected material, and the functions that can be exhibited are also different. For example, in the case of a carbon shaft, the mass is in the range of about 40 g to 75 g, and even if it is a lightweight and highly flexible golfer, it is possible to improve the head speed, but twisting at the time of impact occurs, and flying It is difficult to control the direction of the sphere. Further, in the case of a steel shaft, the mass is in the range of 90 g to 120 g, and it is heavy and has little bending, but the twist upon impact is small and the directionality of the flying ball can be easily controlled.

  The grip 4 is a junction between both hands at the tip of the golfer's body and the club, and has a function of transmitting the rotational speed generated by the rotation of the body to the head 2. For this reason, it is preferable that the grip 4 has a thickness corresponding to the size of the palm, and a material that is not slippery and can relieve an impact at the time of impact. The grip 4 is preferably lightweight except for putters, and is usually in the range of about 40 g to 60 g.

  On the other hand, when considering the golfer's physical strength, strength, or skill, the golfer is classified as follows: “Men's advanced (5th grade)” who is advanced in both physical strength, strength and skill, (4th class) ”,“ powerless, senior (3rd class) ”consisting of powerless boys or seniors,“ women (2nd class) ”consisting of normal female golfers, and powerless female golfers It is possible to classify into approximately 5 levels of “powerless women (first grade)”.

  The present inventor investigated the tendency of mass W, balance arm A, swing balance M, and bending condition in clubs (excluding putters) used by golfers corresponding to the above-mentioned five stages of layers. As a result, there was the following tendency.

  The ratio of club count and mass is the highest in the fifth grade, which is a male senior, and then the fourth grade, the third grade, the second grade, and the first grade in that order. That is, the mass of the club for each count becomes larger as the person has better physical strength, muscle strength or skill, and becomes smaller as the power decreases.

  In a specific count club, the balance arm A is the smallest in the fifth grade layer, and then increases in the order of the first grade layer, the second grade layer, the fourth grade layer, and the third grade layer. In other words, the center of gravity of the club adopted by the senior man is closer to the grip side than the head side, and the lower the force, the closer the center of gravity is to the head side. However, female (first and second class) golfers are less powerful than men, and if the center of gravity of the club gets too close to the head, the increased swing balance M is a burden on the body. Since it becomes difficult to control the swing, a club that is relatively close to the grip side is used.

  The swing balance M with respect to the balance arm A becomes smaller in the order of the fifth grade layer, the fourth grade layer, and the third grade layer, and further becomes smaller in the order of the second grade layer and the first grade layer. As described above, the swing balance M is the product of the mass W of the club and the square of the swing arm Aj, and the swing arm Aj is a value obtained by subtracting the grip length G from the balance arm A. Therefore, in the club of a specific count, the swing balance M with respect to the balance arm is the largest even though the balance arm A of the fifth grade is the smallest, compared to the clubs of other grades. The balance arm A of the first grade layer is small and the swing balance M with respect to the balance arm A is the smallest, indicating that the mass of the club is the smallest as compared with the clubs of the other grade layers. Yes.

  The degree of shaft deflection is the smallest in the fifth grade layer, and then increases in the order of the fourth grade layer, the third grade layer, the second grade layer, and the first grade layer. That is, the advanced person can extend the flight distance without expecting the shaft to bend, and as the force decreases, the head speed is expected to increase as the shaft bends.

  When the above trends were verified by the driver's club, the following results were obtained.

Mass W (g), 5th layer: 332-320, 4th layer: 315-300, 3rd layer: 290-275, 2nd layer: 280-270, 1st layer: about 265,
Balance arm A (cm), 5th layer: 83-85, 4th layer: 86-88, 3rd layer: 88-92, 2nd layer: 87-89, 1st layer: about 85,
Swing balance M (× 10000 g · cm ² ), 5th layer: 130 to 133, 4th layer: 132 to 137, 3rd layer: 134 to 143, 2nd layer: 120 to 125, 1st layer: about 110,
Bending condition, 5th layer: heavy and hard, 4th layer: light and medium hardness, 3rd layer: light and soft, 2nd layer: light and soft, 1st layer: very light and soft.

  Accordingly, at least two values including the swing balance M among the mass W, the balance arm A, the swing balance M, and the total length L of the club (hereinafter collectively referred to as “club characteristics”) are obtained for each club. By combining and displaying with symbols or numerical values, it becomes easy for the golfer to select a club according to his / her physical strength and strength.

  FIG. 2 is a view showing an example of a label displaying the characteristics of the club 1 shown in FIG. In the figure, a label 10 is provided with adhesiveness on one side of a thin metal film, and a symbol and a numerical value indicating club characteristics are printed on the other side.

  The label 10 is affixed to a preset position of the club 1 so that a golfer who wants to purchase the club 1 can easily see it. The position where the label 10 is affixed to the club 1 is not particularly limited. For example, if the outer peripheral surface of the shaft 3 is connected to the shaft 3 and the grip 4, dirt is not generated and the position is easy to see. You can say that.

  The symbols and numerical values printed on the label 10 indicate that the first three-digit numerical value 11 corresponds to the total length L of the club 1, and the total length L is rounded to the first decimal place. Therefore, the numerical value 11 in the figure indicates that the total length L is 114 cm, that is, a range of 113.5 cm to less than 114.5 cm.

  The second symbol 12 is obtained by dividing the value (cm) of the balance arm A and adding symbols. For example, a to z of the alphabet are a: 68, b: 69, c: 70, d: 71, e: 72, f: 73, g: 74, h: 75, i: 76, j: 77, k: 78, l: 79, m: 80, n: 81, o: 82, p: 83, q: 84, r: 85, s: 86, t: 87, u: 88, v: 89, w: 90, x: 91, y: 92, z: 93.

  Each numerical value corresponding to each symbol is shown as a numerical value rounded off to the first decimal place. For example, r in symbol 12 shown in FIG. It shows that it exists in the range of 5 cm-less than 85.5 cm.

  A third numerical value 13 subsequent to the symbol 12 represents a numerical value obtained by rounding off the value (g) of the mass W of the club 1 to the first decimal place. For example, 305 of the numerical value 13 shown in FIG. 2 indicates that the mass is 305 g, that is, in the range of 305.5 g to less than 306.5 g.

Further, the symbol 14 following the numerical value 13 is obtained by dividing the value of the swing balance M (× 10000 g · cm ² ) and giving the symbol, and the value of the swing balance M is divided into 21 to correspond to the alphabet. It is. For example, A: 91, B: 94, C: 97, D: 100, E: 103, F: 106, G: 109, H: 112, I: 115, J: 118, K: 121, L: 124, M: 127, N: 130, O: 133, P: 136, Q: 139, R: 142, S: 145, T: 148, U: 151, V: 154, W: 157, X: 160, Y: 163, Z: 166.

In particular, in this embodiment, the numerical value range of the symbol 14 is set to a range of −1 × 10000 g · cm ² or more and less than + 2 × 10000 g · cm ² with the displayed numerical value as the center, and the swing balance M of the club 1 is further increased. It is subdivided into three, a, b and c. That is, the numerical value of the symbol 14 is subdivided by setting a as -1 generation, b as ± 0 generation, and c as +1 generation. For example, when the symbol 14 is Pa, the swing balance M represents 135 × 10000 g · cm ² or more and less than 136 × 10000 g · cm ^{2. In} the case of Pb, the swing balance M is 136 × 10000 g · cm ² or more and 137 × 10000 g · cm. represents less than ^2, a swing balance M in Pc represents a 138 × 10000 g · cm less than ² 137 × 10000 g · cm ² or more. Therefore, the Ka of the symbol 14 shown in FIG. 2 indicates that the club swing balance M is 120 (× 10000 g · cm ² ) or more and less than 121 (× 10000 g · cm ² ).

  The label 10 can further display numerical values such as the mass of the shaft and the degree of bending. The numerical values and symbols printed on the label 10 are not limited to those in the above embodiment. For example, the value of the total length L and the mass W of the club 1 are symbolized, the value of the balance arm A and the value of the swing balance M. Of course, the value may be expressed numerically.

  The means for displaying numerical values and symbols indicating the characteristics of the club 1 is not limited to the label 10 described above, and a plurality of columns may be printed and displayed on a paper having a certain thickness. A bar code or an IC chip may be used.

  Next, the configuration of the club set will be described with reference to FIGS. FIG. 3 is a diagram showing the relationship between the value of the balance arm A and the value of the swing balance M of the clubs constituting the club set according to the present embodiment. FIG. 4 is a diagram showing the relationship between the value of the balance arm A and the value of the mass W of the clubs constituting the club set according to the present embodiment. In the figure, the x marks in each line indicate the pitching wedge, the ● marks indicate the driver, and the ▲ marks indicate the 5th iron.

  A line 21 shown in FIG. 3 connects the value of the swing balance M to the value of the balance arm A of the driver (1w) from the pitching wedge (Pw) of the club set according to the present embodiment. The clubs that make up this club set are intended for seniors (third grade).

In the line 21, the balance arm A of Pw is 75, and the swing balance M at this time is 116. In 1w, A is 89.5 and M is 136. This line 21 is
It is approximated by a linear function represented by M = αA + β, and the proportionality constant α is set to about 1.14. It is natural that other clubs constituting the club set, such as 3 iron (3I), 6 utility (6U), 3 fairway wood (3W), etc. are also located on the line 21. .

  As described above, a golf club using the clubs constituting this club set is configured by increasing the swing balance M at a constant ratio in accordance with the increase of the balance arm A in the club set composed of a plurality of clubs excluding the putter. Regardless of the number of the selected club, it is possible to realize a stable swing by always applying the same load when swinging.

  In the figure, the line 22 represents the relationship between the balance arm A and the swing balance M in a club set intended for first-class golfers, and the value of the swing balance M is the smallest. Further, the proportional constant α of the line 22 is set to about 1.

  Lines 23 and 24 represent the relationship between the balance arm A and the swing balance M in the club set for the second-class golfer, and the value of the swing balance M is for the first-layer of the line 22. It is bigger than what we did. Further, the proportionality constant α of the lines 23 and 24 is set to about 1.24.

  The line 26 represents the relationship between the balance arm A and the swing balance M in the club set for the fourth grade, and the value of the swing balance M is larger than that of the line 21. Further, the proportional constant α of the line 26 is set to about 1.3.

  A line 25 represents the relationship between the balance arm A and the swing balance M in the club set for the fifth grader who is an advanced player. In the club set represented by the line 25, the shaft is made of steel and the total mass of the shaft and the grip is large. Therefore, the center of gravity is gripped more than the clubs constituting the club set of the lines 21 to 24 and the line 26. Is on the side. For this reason, the value of the balance arm A is extremely smaller than those for the third and fourth layers of the lines 21 and 26 (to the left in the figure), and the proportional constant of the line 25 is about 1 .35.

  Note that the proportionality constants of the lines 21 to 26 are not limited to the numerical values of the present embodiment, and a smooth swing can be achieved even if the proportionality constant is set to about 1.5 in a fifth-class golfer. It was possible. However, when the proportionality constant is about 2, when swinging a club (1w or 3w) that extends the flight distance, a large load is applied to the body, and a stable and smooth swing can be realized for one round of play. It becomes difficult.

  In the lines 21 to 26, the gradient of the straight line portion represents the degree of intention to use the inertia of the head at the time of the swing, and the gradient is stronger and more advanced for the advanced player. However, the swing balance M point of the extended line (dotted line portion in FIG. 3) and the solid line swing balance M point of the straight portion of the long club, the wood club, particularly the balance arm A of the driver (1W), the line 21, 25 and 26. The deviations Δ21, Δ25, and Δ26 indicate the intention to increase the head speed by utilizing the deflection of the shaft due to the inertia of the 1 W head, which is a long club. Since it is difficult for advanced players to control the direction of the hit ball, since a hard shaft with less bending is used, Δ25 is smaller. Δ21 is the largest because a soft shaft with a large diameter is used. Furthermore, in the case of women for the lines 22 to 24, the swing balance M has a large value as a woman in order to use the inertia of the head, even if 1W is desired to increase the flight distance even if it is almost a straight line and does not deviate. This is because a preferable swing cannot be performed because of too much.

  Further, the value of the balance arm A and the value of the swing balance M in the present embodiment are not limited to these values, and can be set as appropriate.

  FIG. 4 is a diagram showing the relationship between the balance arm A and the mass W of the club in the club set for the tertiary layer shown by the line 21 in FIG. As shown in the figure, the mass of the club decreases in order from Pw to 1w.

  As apparent from FIG. 4, the mass W decreases in a linear function in the iron range as the balance arm A increases, and the decrease rate decreases as the wood ranges become 5w, 3w, and 1w. That is, there is a limit in securing the head mass even if the club mass W is reduced. If the club mass W is too small, the club function is impaired and smooth swing is hindered.

  By constructing a club set having the relationship between the balance arm A and the swing balance M as described above, it is possible to obtain an optimum club set according to the golfer's physical strength, muscle strength, or skill. The golfer can adjust the club set to the optimum club set based on the relationship of the value of the swing balance M with respect to the balance arm A in addition to the proportionality constant according to his / her physical strength, muscle strength or skill, which is extremely effective. Furthermore, if the value of the swing balance M with respect to the balance arm A (for example, 76 cm) fixed and set together with the proportional constant is specified, the balance arm A and the swing balance M of any club number except the club set putter are determined. It is possible to specify the value, and it is possible to select the most suitable club set for yourself using this value as a guide.

  Next, the configuration of the first grip will be described with reference to FIG. The grip 4 shown in the figure is formed in a cylindrical shape having a hollow inside with one end closed, and the end of the shaft 3 is inserted into the hollow portion and both are fixed. The grip in the club is not necessarily limited to the configuration shown in the figure, but there is also a grip formed by winding a long and narrow tape from the end of the shaft multiple times, and this embodiment is commonly used for any grip. It is possible.

  A plurality of lines 4b are provided on an end 4a of the grip 4 on the insertion side of the shaft 3 or an end 4a of the grip 4 starting from the side opposite to the head 2 on the shaft 3 (head side). The numerical value 4c is formed between each line 4b. Each numerical value 4 c indicates the mass from the end side of the grip 4 to the line 4 b displayed, and the numerical value 4 c displayed on the end 4 a indicates the current mass of the grip 4. A line 4b indicates a mass section represented by each numerical value 4c.

  When the mass of the grip 4 is adjusted, the grip 4 is cut along the line 4b and the insertion side of the cut shaft is excluded. For this reason, the line 4b may be simple printing or engraving, but is preferably a line composed of perforations so that excision can be easily performed. Moreover, since the line 4b and the numerical value 4c are for adjusting the mass of the grip 4, these are preferably set in fine units such as 1 g or 2 g.

  In this embodiment, a numerical value 4c (60) representing 60 g as an initial mass is displayed on the end 4a of the initial grip 4, and a numerical value 4c (43 representing 43g is located at the position farthest from the end 4a. ) Is displayed.

  Next, the configuration of the second grip will be described with reference to FIG. In the figure, the grip 4 is configured by winding a sheet 4d shown in FIG. 5A around the end of the shaft 3 and attaching a cap 4g to the end of the sheet 4d and the shaft 3. A double-sided adhesive tape (not shown) is affixed to the entire surface or a part of the inner surface of the sheet 4d.

  A plurality of sheets 4d having different masses are prepared as the sheet 4d. It is possible to adjust the mass of the grip 4 by selecting the sheet 4d having the optimum mass from these sheet groups and winding and fixing the sheet 4d on the end side of the shaft 3 constituting the target club 1. is there. When selecting the sheet 4d, it is a matter of course that at least one sheet is required, but two or three sheets can be selected as necessary. In this case, the grip is not inserted into the shaft, but a sheet-like material is wound, so that it is easy to attach and detach, and it is possible to reuse the sheet once removed. The sheet shape may be rectangular or rhombus.

  For this reason, at least a numerical value 4e representing the mass is displayed on the sheet 4d, and the mass of the grip 4 can be adjusted or appropriately set by confirming and selecting the numerical value 4e from among a large number of sheets 4d. Is possible.

  In addition to the numerical value 4e of the mass, it is preferable to display a numerical value 4f representing the thickness of the sheet 4d on the sheet 4d. Thus, by displaying the thickness of the sheet 4d, it is possible to adjust the thickness of the grip 4 configured by winding the sheet 4d around the shaft.

  Next, referring to FIG. 7, the tendency of the balance arm A to change when adjusted by reducing the mass of the grip 4 as described above, and the mass reduced by the grip 4 without changing the mass of the grip 4. An example in which the tendency of change of the balance arm A when the same mass as that of the head 2 is increased and adjusted is compared will be described.

  In the figure, the vertical scale indicates the change in the balance arm A relative to the change in the mass W of the club, that is, ΔA / ΔW. A line 31 shows a change tendency when the mass of the grip 4 of each club except the putter is reduced by 5 g (ΔW = 5), and a line 32 shows a mass of the head 2 of each club except the putter is 5 g ( ΔW = 5) It shows a change tendency when increased.

  As can be seen from the figure, when the value of the balance arm A is increased to increase the value of the swing balance M, the rate of change is larger when the mass of the grip 4 is reduced than when the mass of the head 2 is increased. Thus, the change of the balance arm A can be increased with a slight change in mass (the mass of the grip 4).

  Although the figure shows a case where the value of the balance arm A is increased to increase the value of the swing balance M, the value of the swing balance M is increased by increasing the mass of the grip 4 and decreasing the value of the balance arm A. (The mass W of the club increases but the value of the swing balance M decreases), or the mass of the head 2 is reduced and the value of the balance arm A is decreased to decrease the value of the swing balance M. Is possible. However, in reality, it is difficult to reduce the mass of the head 2 in order to reduce the value of the swing balance M as a general work, which is not preferable. That is, by slightly changing the mass of the grip 4, the value of the swing balance M can be greatly changed. Therefore, adjusting the swing balance of the club is more effective than changing the mass of the head. It shows that it is more effective to change the mass. Furthermore, an adjustment method that combines the adjustment of the masses of both the grip and the head makes it possible to adjust both the club mass and the swing balance M, and is more effective.

It is a figure explaining the dimension conditions of a club. It is a figure which shows an example of the label which displays the characteristic of the club. It is a figure showing the relationship between the value of the balance arm A of the club which comprises a club set, and the value of the swing balance M. It is a figure showing the relationship between the value of the balance arm A and the value of mass W of the club which comprises a club set. It is a figure explaining the composition of the 1st grip. It is a figure explaining the composition of the 2nd grip. It is a figure explaining the tendency of the change of a balance arm when adjusting by reducing the mass of a grip, and the tendency of the change of a balance arm when adjusting by increasing the mass of a head.

Explanation of symbols

A Balance arm Aj Swing arm G Grip length L Total length Lj Effective length M Swing balance 1 Club 2 Head 3 Shaft 4 Grip 4a End 4b Line 4c Numerical value 4d Seat 4e, 4f Numerical value 5 points (center of gravity)
6 End of shaft side of hand 10 Label 11 Numerical value 12 Symbol 13 Numerical value 14 Symbol 21-26, 31, 32 lines

Claims (4)

In a golf club consisting of a head, shaft and grip,
Let L be the total length of the club,
Let the total mass value of the club be W,
The value of the dimension from the center of gravity of the club to the end of the grip is A,
Aj is a length value from the center of gravity of the club to a position obtained by subtracting a certain dimension from the grip end, and M is a product of the square of the Aj and the total mass W of the club.
A golf club characterized in that at least two values including M are combined and displayed as symbols or numerical values. In a golf club set including a plurality of golf clubs composed of a head, a shaft and a grip, excluding a putter,
Let W be the total mass of each club.
The value of the dimension from the center of gravity of each club to the end of the grip is A,
When the value of the length from the center of gravity of each club to the position obtained by subtracting a certain dimension from the grip end is Aj, and the product of the square of Aj and the total mass W of the club is M, a plurality of clubs Each value M is configured so that the proportional constant of the value A of the dimension from the center of gravity of the club to the grip end is a positive linear function, and the value of the proportional constant is represented by a symbol or a numerical value. A golf club set characterized by In a golf club grip, a mark or a remaining part for adjusting the mass of the grip by cutting away a part of the grip on the leading end side of the grip which has started to be wound from the other end of the shaft insertion side or the head side of the shaft A grip formed by forming a symbol or a number representing the mass of the portion or the portion to be cut. In the grip of the golf club,
A grip characterized by winding a sheet selected from a plurality of sheet groups each having a different mass and at least a mass displayed on a shaft.

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