JPH10179816A - Golf wood club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver which can attain an accurate meeting rate to the same degree as with a short type of driver while it assures an increased flying distance to a great extent by selecting a shaft length to meet a specific inequality in compliance with the weight of the head. SOLUTION: A golf wood club has a loft angle of 16 deg. or less, a height of face of 40mm or more, a head volume V of 270-450ml, a head weight G of 160-190g, and a shaft length S of 120cm or more, wherein the length S meets the condition expressed by the inequality 298-1.023G<=S<315.8-1.023G.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf wood club which has a long flight distance and is capable of accurate shots with good reproducibility even if it is a female golfer or a weak male golfer.

[0002]

2. Description of the Related Art With respect to driver clubs, golfers have been interested in increasing the flight distance, and the appearance of drivers who fly well has always been desired. In particular, for a weak male golfer, lack of flight distance is the biggest cause of inferiority. Also, even if a female golfer can swing correctly, there is no flight distance, so there is a limit to the score, and there is a problem that it cannot be a low handicap golfer. However, in order to increase the flight distance, it was thought that extending the shaft was a natural principle, but if the shaft is elongated, the accuracy of driver shots becomes extremely poor, and at present, 4
At present, drivers of 8 inches or more are not commercially available or practically used. Also, even fairway wood clubs, wood clubs with shafts of 43 inches or more, rather than 48 inches or more, are considered to be unable to make accurate shots and have not been put to practical use. The present inventors have, first,
A wood club was proposed, which has a longer flight distance and a greater reproducibility for those who are slightly more powerful than those for male golfers who are less powerful, but later research has shown that this club can be either female or male male, such as an elderly male. It has been revealed that a male or a male having weak muscular strength tends to make a shot with poor reproducibility such as pushing out the ball to the right without swinging.

[0003]

SUMMARY OF THE INVENTION The present invention, based on certain design concepts, produces a driver for a powerless golfer that is at least 120 cm (about 47 inches), preferably at least 125 cm (49 inches), and 129.5 cm (129.5 cm). (51 inch)
Even with the above-described length, the present invention provides a driver in which the accuracy of reproducibility due to push-out of a driver shot or the like does not decrease. Also, based on the same design concept, 12
A long fairway golf wood club having a length of 0 cm (about 47 inches) or more, preferably 125 cm or more is provided.

[0004]

As a wood club, it is well known that, for example, if a driver's shaft is lengthened, a head speed increases and a ball flies. The initial velocity v of the golf ball is determined by the weight M of the driver's head,
It is determined by the head speed H and can be expressed by the following equation.

Embedded image Here, E is the rebound rate of the golf ball. 46 is a numerical value of a golf weight of 46 g. Actually, the rebound rate of the golf ball is considered to be about 0.8 from the measurement of the ball initial velocity at the time of hitting with a driver head speed of 45 m / sec.

Embedded image Becomes This equation shows that the ball initial velocity increases in proportion to the head velocity, but the head weight M exists in the denominator and the numerator, so that even if M increases or decreases, the change in the ball initial velocity v is insensitive. . This means that for a less powerful golfer, even if the head weight is reduced by, for example, 15 g, the initial velocity of the ball is reduced by only 1 m / sec (corresponding to a 4.5 yard distance reduction). Is shown. Therefore, compared to the previously proposed driver, if the head weight is reduced by 15 g, a less powerful golfer can perform a sufficiently fast and accurate swing, and the flying distance is reduced by only 4.5.
It turned out to be a yard. About 3
The increase in flight distance of 5 yards is reduced to only about 30 yards. Now, the head speed increases as the shaft lengthens, so the ball's initial speed does not decrease much even if the head weight is reduced, and the head speed increases as the shaft lengthens, and the ball's initial speed is proportional to the head speed. It can be seen from the above equation that the number increases. Further, if 200 g is adopted as the head weight, the head weight becomes 2
At around 00 g, the initial velocity of the ball is expressed by the following equation. That is, when the head speed increases by 1 m / sec, the initial velocity of the ball increases by about 1.5 m / sec. The present invention
Basically, by reducing the head weight insensitive to the ball initial speed v and lengthening the shaft, the head speed H is increased to increase the ball initial speed. But,
It is also known that simply increasing the length significantly reduces the reproducibility of the driver shots. When analyzing the reproducibility of driver shots, it is necessary to consider the reproducibility of the meat ratio captured by the lead and the reproducibility of the direction in which the ball flies. In addition, when the shaft is lengthened, the driver cannot be swung with the same swing force if the same head weight is used. A driver who is heavier than the golfer's swing force will significantly reduce swing reproducibility and head speed. We have:
First, as a result of intensive research on a driver with good reproducibility, if a specific head volume and head weight are selected, the reproducibility of shots of a driver with a short shaft of 45 inches or less is not reduced at all, and 48 inches or more, preferably The inventors have found that a driver having a length of 50 inches or more can be obtained, and based on this finding, have completed the present invention. The wood club of the present invention refers to a club in which the length of the sole perpendicular to the face is longer than the height of the face surface regardless of the material of the head. In the present invention, the loft angle is a shape of an address with the face surface facing the target, that is, a head such that when viewed from directly above, a vertical line from the face surface overlaps a direction line toward the target. Is the angle formed between the face surface of the club and the vertical surface when the sole of the club is kept horizontal and the center of the shaft axis is maintained on the vertical surface. This is what is called a real loft. The length of the shaft in the present invention is the length from the grip end to the point where the extension of the shaft of the shaft reaches the floor surface, with the wood club being addressed to the floor surface in the usual manner. The present inventors first considered that loft 16
For a driver having a face surface height of 40 mm or less, preferably 14.5 degrees or less, a study on mechanical and geometrical studies has revealed that a constant length of the shaft, head volume and head weight is required when designing a club. In terms of the relationship, it has been found that a driver with good reproducibility can be obtained even when the flight distance is increased by lengthening the shaft, and based on this finding, the driver-type wood club of the present invention was completed. Then
When the technical concept of the driver of the present invention is applied to a fairway wood club having a loft of 13 to 21 degrees, preferably 15 to 20 degrees, the influence caused by the increase in the loft and a usage mode that is completely different from the driver and that does not tee up are considered. Then, it was found that it was necessary to correct the relational expression between the height of the face surface and the length of the shaft, the head volume, and the head weight to be different from that of the driver. completed. That is, the present invention comprises the inventions described in the following items, and provides the following two types of wood clubs that are distinguished by the height of the face surface.

(A) Driver type wood club (1) The loft angle is 16 degrees or less, preferably 14 degrees or less, and the height of the face surface is 40 mm or more, preferably 4 degrees or less.
5 mm or more, the head volume V is 270 to 450 ml, the head weight G is 160 to 190 g, the shaft length S is 120 cm or more, and the shaft length S is the following inequality (A A) a golf wood club which is in the range of). 298-1.023G ≦ S <315.8-1.023G (A) (2) Shaft length 125 cm or more, preferably 127 cm
Or more, particularly preferably 130 cm or more, and the head volume 27
0-450 ml, and the head weight G is 160-180 g
(1) The golf wood club according to (1). (3) Shaft length 130 cm or more, preferably 135 cm
Above, particularly preferably at least 140 cm, and a head volume of 30 cm.
0-450 ml and the head weight G is 160-175 g
(1) The golf wood club according to (1). (4) The golf wood club according to (1), (2) or (3), wherein the length S of the shaft is in the range of the following inequality (B). 299.5-1.023G ≦ S <315.8-1.023G (B) (5) The length (S) of the shaft is within the range of the following inequality (C). ), (3) or (4). S ≦ 170 (V / 200) ^1/3 −55 (C) (6) The grip is a rubber grip, and a soft synthetic resin tape is wound around the surface of the rubber grip. ), (2), (3), (4) or (5)
The golf wood club according to the item. (B) Wood club for fairway (7) Loft angle is in the range of 13 to 21 degrees, preferably 1
5-20 degrees, face height 30-40m
m, preferably 30 to 36 mm, the volume V of the head is 150 to 300 ml, preferably 170 to 300 ml, particularly preferably 200 to 300 ml, and the head weight G is 1
60 to 190 g, and the length S of the shaft is 120 cm or more, preferably 125 cm or more, particularly preferably 129 cm.
A golf wood club as described above, wherein the length S of the shaft is in the range of the following inequality (D). 298-1.023G ≦ S <315.8-1.023G (D) (8) The golf wood club according to (7), wherein the length S of the shaft is in the range of the following inequality (E). . 299.5-1.023G ≦ S <315.8-1.023G (E) (9) The length (S) of the shaft is within the range of the following inequality (G). ) The golf wood club described in the item. S ≦ 170 (V / 200) ^1/3 −40 (G) (10) The grip is a rubber grip, and a soft synthetic resin tape is wound around the surface of the rubber grip. )), (8) or (9). Of the two clubs, the wood club (a) can be used as a driver-type wood club and the wood club (b) can be used as a fairway wood club. For driver type clubs with a loft angle of more than 16 degrees, if the shaft length is 120 cm or more, the ball will rise too high, and the increase in flight distance cannot be expected.
The accuracy of the flight distance is significantly reduced. Also, in a fairway wood club, the above-mentioned ball rises in a loft exceeding 21 degrees. The wood club of the present invention has a shaft length of 120 cm or more, 125 cm or more, preferably 127 cm or more, particularly preferably 130 cm, corresponding to the range of the head shape, head weight and head volume.
Above, it is specified to be 132 cm or more, preferably 137 cm or more, particularly preferably 142 cm or more. If the length is not in this range, the effect of increasing the flight distance is not remarkable as compared with the conventional case. In the wood club for fairways of the present invention, the height of the face surface must be 40 mm or less, preferably 38 mm or less, and particularly preferably 35 mm or less. By making such a thin face, even if the head volume is 200 ml, which is smaller than that of the driver type club, the plane area viewed from the upper surface direction of the head becomes large,
The core becomes wider in the horizontal direction. At Fairway Wood,
If the lead comes off in the vertical direction to hit without teeing up, it will be a miss shot originally, so there is an advantage to make the lead larger in the horizontal direction, but even if the lead is widened in the vertical direction like a driver Not advantageous. In addition, the thinness makes it difficult to remove the ball below the core and hit the ball easily, so that the ball can be hit easily, which is an essential condition for a long shaft fairway club.

[0006] In addition, because the thinness of the head is large in the horizontal and vertical directions of the plane area, the moment of inertia in which the head is rotated by the impact of the ball is increased, and the directionality is increased. The horizontal dimension of the driver increases, and the center of gravity moves away from the face, increasing the depth of the center of gravity.In addition, since the loft is larger than the driver, the directionality and the area of the sweet area increase, so that it is compared with the driver. Then, the shaft can be made longer for the head volume. In order to satisfy the large volume and light weight of the club of the present invention, the club head necessarily has a structure in which a hollow or hollow body is filled with a foamed material. In the present invention, the height of the face is the height of the largest width of the front face. It does not include the swelling and sole on the top surface of the head. As described above, the basic configuration of the driver-type golf wood club of the present invention for a non-powered golf wood club is to increase the length of the shaft and to reduce the volume of the head according to a certain dynamic rule corresponding to the length. This is a technical idea to increase the size and reduce the weight of the head. For example, in a wood club, 51
If the head weight exceeds 180 g in the case of a shaft having a length of about 130 cm (about 130 cm), the swing becomes inaccurate with the swing force of a non-power golfer, and it is impossible to hit an accurate shot. When the volume of the head of the driver-type club is less than 270 ml, it becomes difficult to hit a ball in a sweet area in a driver shot with a long shaft. That is, the meet rate decreases. On the other hand, in the case of the wood club for fairway (b), since the loft exists, the substantial core is enlarged. Although the volume may be smaller than that of the driver type, it is still 150 ml or more, preferably 170 ml or more, particularly preferably 200 ml.
If there is no such volume, the meet rate decreases when the shaft length is 120 cm or more. Here, the head volume is a volume obtained by cutting a connection portion of the upper surface of the head of the wood club with the shaft. For a club with a missing wood upper surface, the volume is calculated assuming a curved surface formed by the upper edge of the face surface and the periphery of the club. The present inventors first focused on the driver-type club, in that the width of the core of the driver shot is proportional to the size of the driver's head. Here, the area of the lead is defined as an area range of the driver face in which the flight distance is 10 yards less than the maximum flight distance when the ball is hit with the driver's true core. By specifying the degree of flight distance decrease in this way,
The area of the core (sweet area) is determined for the first time. According to a professional golfer's driver shot,
If it is off cm, the flight distance will be reduced by about 10 yards and 2cm from the core
It has been found that a flight distance of about 30 yards is reduced when the ball is off. The driver used at this time has a capacity of 200 ml
The following was a small head. First, the present inventors have noted that the error of decentering is proportional to the distance between the golfer's eyes and the ball. One of the features of the present invention is that the error is usually considered to be proportional to the length of the shaft, but the fact that the error is proportional to the distance between the eye and the ball is noted. Accordingly, it has been found that when the shaft is lengthened, the distance between the golfer's eyes and the ball increases, but in proportion to the increase, the exact reproducibility of the driver shot does not decrease when the head size is increased. Now, with an average head volume of 200 ml, 44 inches (11
A driver with a shaft length of 0 cm) is taken up as a comparison for the prior art. When a shot is taken with this driver, the average distance between the ball and the eye changes depending on the height, but the average distance is approximately 170 cm according to actual measurement. Here, if the shaft is lengthened by scm, the distance between the eye and the ball is approximately "170 + s" cm. Therefore, if the size of the head is multiplied by [(170 + s) / 170] times, the reproducibility of the driver shot with respect to the meet rate of the core does not decrease. Assuming that the head volume of the driver of the present invention is V, the dimensions are proportional to the cubic root of the volume. Therefore, based on a volume of 200 ml, a driver having a dimension capable of maintaining the same reproducibility of the core meet rate as a 200 ml driver head. The head volume V is given by the following equation. (170 + s) / 170 = (V / 210) ^1/3 By rearranging this equation, s is represented by the following equation. s = 170 (V / 200) ^1/3 -170 The length S of the shaft of the driver is 44 inches (110c
Since s is added to m), the length S of the driver's shaft is given by the following equation. S = 110 + 170 (V / 220) ^1/3 −170 = 170 (V / 200) ^1/3 −60 This equation slightly varies depending on the height and address shape of the golfer. However, since the length of the shaft at the time of address is included, the influence of the difference in height is considerably reduced. In addition, if the height of the club is the same, the distance between the eye and the ball will be shorter. Is virtually negated in practice. According to this equation, when the volume is 270 ml, the length of the shaft can be made about 127 cm. Therefore, the safe side 120
A 270 ml head volume driver for a cm length should not reduce the meat rate. For this reason, the volume of the driver-type wood club of the present invention is specified to be 270 ml or more. The driver club of the present invention has a capacity of 200 ml up to about 5 cm longer than the above formula.
A shot can be shot at the same meet rate as a conventional persimmon type driver having the following head volume. Therefore, it is desirable that the length S centimeters of the shaft be in the range of the following inequality (C). S ≦ 170 (V / 200) ^1/3 −55 (C) The shorter S is, the higher the meet rate is, but the shorter the flight distance is. Therefore, it is more desirable that the length S centimeters of the shaft be in the range of the following inequality (H), since a large flight distance can be obtained by effectively utilizing the head volume.
170 (V / 200) ^1/3 −65 ≦ S ≦ 170 (V / 20
0) ^1/3 -55 (H) On the other hand, if the golfer's swing force is kept constant and the length of the shaft S is increased, the swing speed and reproducibility will be reduced unless the weight of the head is reduced accordingly. descend. Next, the present inventors considered that a driver M having a head weight of 168 g [Axel I duralumin manufactured by Tsuruya Co., Ltd., 44 inch carbon shaft, head volume 300 ml] and a driver N having a head weight of 180 g [Titanium carbon manufactured by Yonex Co., Ltd.] 300, 45 inch carbon shaft, shaft rigidity R, head volume 300m
l], for each inch, the strength of a female golfer (grip strength 25-2
8 kg weight) and powerless male golfer (gripping power about 35 ~
40 kg weight). The actual swing force cannot be determined only by the grip strength, but the grip strength was adopted as a measure of the swing power of each golfer.

[0007] The experiment was conducted by adding another carbon shaft to the shaft of a commercially available driver M, and 129 cm (about 51 cm).
Inch, 135 cm (about 53 inches), 144 cm (about 57 inches), and 150 cm (about 59 inches) were prepared. The reshaping of the shaft performed here was done by removing the rubber grip of the driver, arranging and winding a nylon monofilament at the end of the shaft with a width of 12 mm to securely reinforce the end, and then applying other adhesive (bond) After inserting a carbon shaft (the surface of which was roughened with sandpaper) and hitting it with a mallet to insert it firmly and leaving it to stand for one day, the adhesive was solidified and fixed, and the inserted shaft for extension was cut at a predetermined length. A rubber grip is fitted on this, and an aluminum back line is attached to the back surface of the grip shaft.On top of that, a tennis grip tape made by Yonex, which is commercially available for tennis,
A wet super grip [trade name, made of polyurethane] was wound. Surprisingly, the long driver feels very light and can swing powerfully simply by winding or backing the polyurethane resin tape. Polyurethane resin tape absorbs sweat from the hands and can hold the grip firmly without wearing gloves. As the grip tape of the present invention, a polyurethane resin tape has excellent sweat absorbability, but a soft synthetic resin, for example, a soft vinyl chloride tape, a soft polyethylene tape, or the like can be used without particular limitation. .
Now, for the other driver N, a shaft length of 139 cm, 13
It was confirmed that the swing force of the male non-strength golfer was exactly the same at 131.6 cm when the height was 1.6 cm and 123 cm. Also, in the case of a female golfer, it was confirmed that the driver N could swing sufficiently up to a shaft of 116.8 cm (46 inches). The driver N was slightly heavier at 123 cm, and a little too light was obtained when the shaft was not extended (114.3 cm). In these swing sensory tests, each golfer performed several or more full swings an arbitrary number of times, and as a result of a discussion of each group of five unpowered men and five women, the unanimous conclusion of each group was obtained. Met. The driver N also had a back line on the grip and wrapped a soft tape to make the same conditions. Also, 20 grips on the driver N and 145 cm driver M grips.
g of lead was attached and the head speed of the swing was measured, but there was no perceptible effect on the swing compared to the case where no lead was attached. That is, it was confirmed that the weight of the grip portion (the weight of the shaft) did not affect the swing. In the same manner as described above, based on the feeling obtained by actually swinging and comparing the driver M who needs the same force as the force of swinging the driver N of the 131.6 cm shaft by the several swings of each of the five powerless men, as described above. It was selected from four types. After discussing the results of the average feeling, the unanimous opinion was that the driver M was lighter at 129 cm, slightly lighter at 138 cm, and almost identical at 144 cm.
The 150cm driver got a bit heavier. For less powerful male golfers, a 144 cm driver M
It was confirmed that the driver could swing with the same force as the driver N of 31.5 cm. As a result, for a less powerful golfer, a 168 g driver is just about 144 cm (about 57 inches) long, and for a 180 g driver, 131 cm (about 49 inches) is a suitable length for a less powerful golfer's swing. Was obtained. The same test was conducted on five women. As a unanimous opinion, the length of the driver M who can swing with the same swing force as the driver N of 116.8 cm (46 inches) is 129.5 c.
m (51 inches). From this number,
The relationship between the length of the shaft and the head weight, which can be accurately and strongly swinged by the non-powered male and female golfers, can be recognized as being in the straight line relationship A and the straight line B as shown in FIG. It can be seen from FIG. 2 that elongation of the shaft of 2.5 cm requires a force approximately equal to an increase in weight of about 2.5 g. From this figure, the relationship between the length S (cm) of the shaft and the head weight G (g) is defined as a linear line, and the relationship can be expressed by the following equation. Non-powered male golfer S = 315-1.023G Female golfer S = 301-1.023G When added to this length and the variation due to the golfer's skill, the length is 3 cm shorter, that is, above the line C in FIG. The portion, preferably up to 1.5 cm shorter, is the length of the driver of the invention. Therefore, the required shaft length S for non-powered male and female golfers
Is in the range of the following inequality: 298-1.023G ≦ S <315.8-1.023G Preferably, 299.5-1.023G ≦ S <315.8-1.023G When the length S of the shaft is less than the lower limit, the flight distance If the degree of increase is not remarkable and exceeds the upper limit of the length of the shaft, the result is that for a forceless golfer, the correct shot reproducibility and the head speed are rather reduced because the driver is too heavy. In the inventor's physical calculation,
About 180g head weight, 15g head weight
When increasing or decreasing, the initial velocity of the popping ball increases or decreases by about 1 m / sec according to the above equation.

According to actual measurements by the present inventor, it has been found that when the length of the shaft is increased by about 2.5 cm, the head speed generally increases by about 1 m / sec. This is an increase of 1.5 m / sec when converted to the ball initial velocity according to the above equation. Therefore, make the shaft 15cm (about 6 inches) longer,
When the head weight is reduced by 15g, the initial speed of the ball is
(9-1 = 8 m / sec). According to actual measurements, an increase in the initial velocity of the ball of 1 m / s is actually measured as a flight distance increase of approximately 4 to 5 yards (published by Heineman, The Search.
Four Parfet Swing, page 163). Therefore,
If you reduce the weight by 15g and lengthen the 15cm shaft, the flight distance will increase by 30 to 40 yards. That is, based on the design concept of the present invention, the 15 cm shaft is lengthened,
If the head weight is reduced, stable swing can be performed with the same swing force, and the flight distance can be increased by about 35 yards. The standard is 129.5 cm (51 inches) at 190 g for a normal male golfer, but about 114 cm to 1 at a head weight of 180 g for a female golfer and a weak male golfer.
The range is 31 cm. For example, if this driver N is 12
In the case of a person who can swing with a length of 1 cm, that is, FIG.
In the case of P, a flight distance of 30 yards or more can be obtained by following the straight line D from the point P to the left and setting the length R to 135 cm with the head weight of 165 g, rather than using the driver N as it is. Will be. Also, when the driver at the point P is used, the flight distance is increased by about 25 yards as compared with using the driver at the point S of 190 g. Similarly, the driver at point S is a normal driver 2
At 00g, this will add about 20 yards more than a 41-inch female driver. Therefore, the driver of the present invention requires a weight of 190 g or less, preferably 180 g or less, more preferably 175 g or less according to the relationship shown in FIG. When the weight is 160 g or less, it is difficult to manufacture a driver head having a large head volume, and the influence of the head weight in the above formula of the initial velocity of the ball cannot be ignored in proportion to the weight of the ball of 46 g. The effect of increasing the distance decreases. Now, as a factor relating to the directionality of the driver shot, the accuracy of the inclination of the shaft at the moment of impact is important. In FIG. 3, when the shaft rotates slightly clockwise due to the impact, the direction of the face shifts from the straight direction T to the right direction R. However, even if the shaft is long, the inclination of the shaft is the same. Therefore, the long shaft of the present invention does not lower the shot directionality. Also, in the case of a swing that swings the weight of the tip of the string dynamically, such as a golf swing, the direction of the face surface changes right and left depending on the position of the grip during the swing at the moment of impact. In FIG. 4, when the impact grip shifts to the left from the correct position, the face turns rightward. Since this factor has a larger allowable range as the shaft is longer, the directionality is slightly improved when the shaft is longer. If the driver of the present invention increases the 30-yard distance, the sweet area with a 30-yard reduction in flight distance has a radius of 2 cm (4 cm in diameter, b in FIG. 5) from the core. This is a 2 cm diameter (Fig. 5a) suite area, which is a 10 yard reduced sweet area for normal 44 inch or smaller drivers.
Reaches twice. Based on the flight distance of a short driver of 44 inches or less, the sweet area has been significantly expanded. In other words, the reproducibility of reproducing the flight distance of a driver shot having a length of 44 inches or less is more than double when expressed in the sweet area. Based on the flight distance of a 44-inch driver, a shot that is dramatically more stable than a 44-inch driver can be shot. In other words, this can be interpreted that the longer the shaft, the wider the sweet area. As described above, the driver club of the present invention not only increases the flight distance when hitting the core than the 44-inch driver, but also provides a more accurate shot than the 44-inch driver based on the 44-inch flight distance. Which is surprising. The present driver wood club is
Even if it becomes a long shaft, when it is evaluated on the basis of the meat rate (that is, based on the maximum flight distance in a long club), the club does not decrease in the meet rate (the area of the sweet area), and is 6 inches. Based on the maximum flight distance of a short driver, there is an extremely great advantage that the diameter of the sweet area is more than doubled as compared with the case of a short driver of 6 inches. One of the major features of the present invention is that simply increasing the shaft length by a few inches provides the same advantage as doubling the sweet area size, ie, increasing the head volume by eight times (1600 ml). In addition, if the ball is hit with the core of the expanded sweet area, a flight distance increase of about 30 yards can be obtained. We have:
The same design concept as the driver was applied to the fairway wood club. That is, the wood club for a fairway of the present invention has a loft angle in a range of 13 to 21 degrees, preferably 15 to 20 degrees, and a face surface height of 30 to 20 degrees.
40 mm, preferably 30 to 36 mm, and the volume V of the head is 150 to 300 ml, preferably 170 to 300 ml,
Particularly preferred is 200 to 300 ml, and the head weight G
Is 160 to 190 g, preferably 160 to 180 g, particularly preferably 160 to 175 g, and the length S of the shaft is 120 cm or more, preferably 125 cm or more, particularly preferably 129 cm or more, and the length S of the shaft is Being in the range of inequality (D), preferably in the range of (E),
Further, the golf wood club is preferably in the range of the formula (G). 298-1.023G ≦ S <315.8-1.023G (D) 299.5-1.023G ≦ S <315.8-1.023G (E) S ≦ 170 (V / 200) ^1/3 − 40 (G) In the case of the wood club for the fairway of the present invention, since there is a loft more than the driver type club, the height of the face surface is 30 in comparison with the ball diameter of 40 mm.
Since it is limited to 40 mm, preferably 30 to 35 mm, the meet rate and directionality are dramatically improved. As a result, by limiting the height of the loft and face,
The improved meet rate allows the head volume to be smaller than the standard for driver-type clubs. From this viewpoint, in the fairway wood club, the lower limit of the head volume is 1 compared to the volume of the driver type club.
It can be as small as 80 ml or more, preferably 200 ml or more. For the same reason, the length of the shaft based on the head volume is also calculated by the numerical value 60 on the right side of the equation for the driver type.
Was found to be suitable by experimentation. That is, the relational expression between the head volume and the length of the shaft is as follows. S ≦ 170 (V / 200) ^1/3 −45 When an allowable range is provided in the same manner as the driver-type club based on this equation, the wood club for a fairway of the present invention can satisfy the following inequality (G), preferably It is desirable to set the range of inequality (J). S ≦ 170 (V / 200) ^1/3 −40 (G) 70 (V / 200) ^1/3 −50 ≦ S ≦ 170 (V / 200) ^1/3 −40 (J) Wood club for fairway of the present invention By creating a golf club that satisfies the new condition, it is possible to obtain a fairway wood club that can be easily hit even when the shaft is 120 cm or longer.

[0009]

According to the present invention, in the case of a long driver or fairway wood having a certain head volume or more, a drastic jump can be achieved by selecting a shaft length conforming to a specific inequality in accordance with the head weight. An object of the present invention is to provide a driver capable of achieving the same exact meeting rate as a short driver despite the increase in distance. Also,
Wood grab for the driver or fairway of the present invention,
For example, based on the flight distance of a normal driver with a short 6-inch shaft, even a golfer who is not powerful has about 30
The yard distance increases. In the case of the driver of the present invention,
The width of the core, which is 30 yards less than the maximum non-distance, has a radius of 2 cm. This has the effect that the size of the sweet area is twice or more, the area is four times or more, and the head volume is eight times or more, considering the flight distance of a driver that is 6 inches shorter. That is, there is an effect that the sweet area increases and the flight distance increases by 30 yards when hitting with a straight core.

[Brief description of the drawings]

FIG. 1 is a perspective view of a driver according to the present invention.

FIG. 2 is a graph showing a relationship between a shaft length and a head weight when a male golfer A and a female golfer B shake with no force.

FIG. 3 is a diagram showing that the direction of the head surface, that is, the direction of a flying ball changes when the angle of the shaft changes.

FIG. 4 is a diagram showing that the direction of the head surface changes when the position of the impact grip changes.

FIG. 5 is a diagram showing that a sweet area reduced by 30 yards is twice as large as a sweet area reduced by 10 yards.

Claims (10)

[Claims] 1. A loft angle of 16 degrees or less, a height of a face surface of 40 mm or more, and a head volume V of 270 to 4
A golf wood club comprising: 50 ml; a head weight G of 160 to 190 g; a shaft length S of 120 cm or more; and a shaft length S in the range of the following inequality (A). 298-1.023G ≦ S <315.8-1.023G (A) 2. A shaft length of 125 cm or more, a head volume of 270 to 450 ml, and a head weight G of 160 to 18
The golf wood club according to claim 1, wherein the weight is 0 g. 3. A shaft having a length of 130 cm or more, a head volume of 300 to 450 ml, and a head weight G of 160 to 17
The golf wood club according to claim 1, which weighs 5 g. 4. The golf wood club according to claim 1, wherein the length S of the shaft is in the range of the following inequality (B). 299.5-1.023G ≦ S <315.8-1.023G (B) 5. The shaft length S is in the range of the following inequality (C).
Or the golf wood club according to claim 4. S ≦ 170 (V / 200) ^1/3 −55 (C) 6. A rubber grip, wherein a soft synthetic resin tape is wrapped around the surface of the rubber grip. The golf wood club according to claim 5. 7. The loft angle is in the range of 13 to 21 degrees, the face height is 30 to 40 mm, the head volume V is 150 to 300 ml, and the head weight G is 16
A golf wood club, which has a length of 0 to 200 g, a shaft length S of 120 cm or more, and a shaft length S in the range of the following inequality (D). 298-1.023G ≦ S <315.8-1.023G (D) 8. The golf wood club according to claim 7, wherein the length S of the shaft is in the range of the following inequality (E). 299.5-1.023G ≦ S <315.8-1.023G (E) 9. The golf wood club according to claim 7, wherein the length S of the shaft is in the range of the following inequality (G). S ≦ 170 (V / 200) ^1/3 -40 (G) 10. A grip according to claim 7, wherein the grip is a rubber grip, and a soft synthetic resin tape is wound around the surface of the rubber grip.
The described golf wood club.