JP2015080695A - Golf club, golf club shaft length-adjusting parts, and parts set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club, golf club shaft length-adjusting parts and a parts set, in and with which a shaft length may be simply and inexpensively increased, decreased and restored into the original length, without exchanging the golf club shaft while obtaining a correct swing weight.SOLUTION: There are provided: golf club shaft length-adjusting parts 10, 20, 30; a parts set; and a golf club W1 provided with the shaft length-adjusting parts. Each of the golf club shaft length-adjusting parts 10, 20, 30 is attached to the grip end side of a golf club shaft 50 in a detachable manner, and whose weight, weight balance and a size in the center axis direction are set so that approximately same entire weight and swing weight with an entire weight and a swing weight of the golf club which are set according to the shaft length of the golf club are obtained.

Description

  The present invention relates to a golf club, a golf club shaft length adjusting part, and a parts set, which is correct according to the length of the golf club shaft without adversely affecting the performance and feeling of use of the golf club and the shaft. The present invention relates to a golf club, a golf club shaft length adjusting part, and a parts set that can obtain a golf club having a different shaft length from a single shaft while obtaining a swing weight and a moment of inertia.

  Golf clubs have different performance depending on the combination of shafts with different hardness and length and club heads with different weights and shapes. Of these combinations, golfers are most suitable for themselves. There is a desire to select a golf club or to change the combination thereof.

  Therefore, a shaft that allows the club head to be exchanged, or a club head that can change the weight and weight balance has been proposed and its use has expanded, but it is possible to change the length of the shaft. Various structures have been proposed for changing the above, but there is a problem described below, and it cannot be said that its use has been expanded.

  For example, what is described in Patent Literature 1 to Patent Literature 3 in which a member for extending the shaft to the grip end portion is screwed or locked and fixed is easy to shorten the length of the shaft. Although it can be changed, since these members are covered with rubber thickly, their weight will greatly change the overall weight of the golf club, and the correct swing weight and inertia according to the length of the shaft There is a problem that the moment cannot be obtained and a problem that the performance of the golf club cannot be maintained.

  In particular, the invention described in Patent Document 2 adopts a configuration in which a plurality of cylindrical extension members are connected to a grip end so as to be stacked in order to change the length of the shaft, The weight is greatly changed, and no consideration is given to obtaining a golf club with the correct swing weight and moment of inertia according to the length of the shaft and maintaining the performance of the golf club. ing.

  As for the thing which changed the position of the grip described in patent document 4 and patent document 5 with a long volt | bolt or a drive shaft, even if a shaft length is changed, the weight of the whole golf club does not change. However, there is a problem that the shaft needs to be subjected to extensive processing, which adversely affects the performance and feeling of use of the golf club and the shaft, and that the entire apparatus becomes large, heavy and complicated.

  Furthermore, in order to change the length of the shaft described in Patent Document 4 and Patent Document 5, the position of the grip is changed by a long bolt or drive shaft. It is considered that no consideration is given to obtaining a golf club having a correct swing weight and moment of inertia.

  In other words, in the invention relating to the adjustment of the shaft length of a conventional golf club, 1) When the length of the shaft is changed, the overall weight of the golf club is greatly changed, and golf with the correct swing weight and moment of inertia corresponding to the length of the shaft It becomes impossible to obtain a club, 2) the performance and feeling of use of the golf club and the shaft are adversely affected, 3) the whole apparatus becomes large and complicated, and 4) the labor and cost of manufacturing. It is thought that it has not been widely used because it has not solved the problem of taking

Therefore, conventionally, in order to enable a golfer to correctly select a golf club having a performance suitable for himself from golf clubs having different shaft lengths, for example, at a golf club store, the length of the shaft is reduced. There is a problem in that it is necessary to prepare a plurality of separate and independent golf clubs having different sizes, and the cost burden of the dealer is large.
For this reason, in stores where test club variations are insufficient, a golfer can purchase a golf club without confirming in advance whether or not the golf club is suitable for him or her by giving it a try, or give up giving up. May end up.

Further, in the conventional invention relating to the adjustment of the shaft length of a golf club, a golfer can correct the correct swing corresponding to the length of the golf club without damaging the original performance and feeling of use of the golf club and the shaft. There is a problem that the length of the shaft cannot be easily changed while obtaining the weight and the moment of inertia.
In addition, even if the shaft can be shortened by cutting the shaft of the golf club, there is a problem that it cannot be returned to the original length.

Japanese Utility Model Publication No. 61-174967 Japanese Patent No. 5175732 JP 2012-249790 A JP-A-9-201435 JP 2011-78768 A

  The problem to be solved by the present invention is that in the conventional invention relating to the adjustment of the shaft length of the golf club, when the length of the shaft is changed, the overall weight of the golf club changes greatly, and the swing weight and moment of inertia of the golf club change. It may be crazy, the performance of the golf club will change, the entire device will become large or complicated, and it will take time and effort in manufacturing.

  Accordingly, an object of the present invention is to solve the above-mentioned problems and when the length of the shaft is changed, the performance and feeling of use of the golf club and the shaft are affected, or the swing weight and the moment of inertia of the golf club are distorted. An object of the present invention is to provide a golf club, a golf club shaft length adjusting part, and a parts set.

  Furthermore, another object of the present invention is to easily and inexpensively increase or decrease the length of the shaft without replacing the golf club shaft and without taking the labor and cost of manufacturing. It is an object of the present invention to provide a golf club, a golf club shaft length adjusting part, and a parts set that can be returned to length.

  The present invention is "a golf club shaft length adjusting part that can be detachably attached to the grip end side of a golf club shaft, and the overall weight of the golf club set according to the golf club shaft length and Parts for adjusting the shaft length of a golf club in which weight, weight balance, and axial direction dimensions are set so as to obtain almost the same overall weight and swing weight as a swing weight, and a golf club having the same Is the most important feature.

The golf club preferably has a golf club shaft length adjusting part that can be detachably attached to a golf club shaft grip end side, and a Gp by cutting the grip end side shorter than a standard length golf club. A golf club comprising a grip reduced in weight, and a golf club shaft cut in a grip end side shorter than a standard length golf club to reduce St grams,
Weight of the part for adjusting the shaft length is set to “Gp + St” gram, and weight balance is obtained so that a swing weight substantially the same as the swing weight of the golf club set according to the shaft length of the golf club can be obtained. A golf club provided with a shaft length adjusting part having a dimension in the axial direction. It is.
Further, by using a grip that is lighter than a normal weight grip, the grip portion can be reduced in weight by “Gp + α” grams, and the weight of the shaft length adjusting part can be made “Gp + St + α” grams.

Also, the present invention provides a golf club shaft length adjustment part set that can be detachably attached to a grip and a golf club shaft grip end side that is shorter than a standard length golf club. A first main body portion having a first predetermined dimension L1 in the axial direction in order to obtain a standard length, and a connecting means formed at one end of the first main body portion and connected to the golf club shaft. ,
The grip end side grip weight Gpgram corresponding to the length corresponding to the first predetermined dimension L1 and the grip end side shaft corresponding to the length corresponding to the first predetermined dimension L1 are shortened. The first shaft length that has a weight “Gp + St” gram with a weight St gram, and whose weight balance is set so as to obtain a swing weight that is substantially the same as the swing weight of a standard length golf club Adjustment parts,
In order to make the golf club shaft different from the standard length, a second main body portion having a second predetermined dimension L2 in the axial direction and a golf club shaft formed at one end of the second main body portion are connected. And having a weight substantially equal to the weight “Gp + St” gram and having a swing substantially the same as a swing weight of a golf club having a length different from a standard length corresponding to the second predetermined dimension L2. A set of parts for adjusting the shaft length of a golf club, comprising a second part for adjusting the shaft length in which a weight balance is set so as to obtain a weight. ".

  The connecting means of the golf club shaft length adjusting part set includes a male screw formed at one end of the main body and a sleeve fixed to the inner peripheral surface of the grip end side end of the shaft. The sleeve may be formed of a sleeve formed on the inner surface with a female screw portion screwed into the male screw portion.

The part for adjusting the shaft length of the present invention configured as described above is detachably attached to the grip end side of the golf club shaft, and the bent portion of the shaft is not processed. The original performance and feeling of use of the club and shaft will not change.
Further, according to the present invention, when the length of the shaft is changed, the overall weight and weight balance of the golf club are substantially maintained at correct values according to the length of the shaft. A golf club that does not go crazy, a part for adjusting the shaft length of a golf club, and a part set can be provided.
Furthermore, by using a lighter grip than usual, it is possible to secure more weight that can be used for the shaft length adjustment part, and freedom to change the strength design, size change, appearance change, etc. of the shaft length adjustment part. The degree can be increased.

Further, the golf club, the golf club shaft length adjusting part and the parts set according to the present invention can easily and inexpensively lengthen the shaft without exchanging the golf club shaft, without incurring manufacturing effort and costs. Or shorten it or return it to its original length.
Therefore, without preparing a plurality of golf clubs with different shaft lengths, golf clubs having the same performance and feel as those golf clubs with different lengths are used as appropriate. Will be able to.

  A golf club, a golf club shaft length adjusting part, and a parts set according to the present invention include a first main body portion having a first predetermined dimension L1 for setting the golf club shaft to a standard length, and the golf club shaft having a standard length. By connecting the shaft length adjusting parts having the second main body portion having the second predetermined dimension L2 for different lengths as appropriate, it is easy to obtain golf clubs having different shaft lengths by the connecting means. It can be carried out.

  Furthermore, golf clubs with different shaft lengths obtained by appropriately replacing the shaft length adjusting parts have almost the same overall weight, and the swing weight and moment of inertia are appropriate for the length of the golf club. Can be.

  In the golf club, the golf club shaft length adjusting part and the parts set of the present invention, the male screw part and the female screw part are used as the connecting means between the shaft and the shaft length adjusting part, so that golf is not required. The shaft length adjusting part can be attached to and detached from the club by hand, and it can be excellent in strength, reliability and durability.

FIG. 1 is a perspective view showing a golf club provided with a shaft length adjusting part embodying the present invention and a golf club shaft length adjusting part set. FIG. 2 is a cross-sectional view showing, in order from the top, a procedure for applying a processing to the shaft and grip of the golf club and mounting the shaft length adjusting part of the golf club embodying the present invention to the grip end portion of the shaft. FIG. 3 is a cross-sectional view showing a state in which a shaft length adjusting part of a golf club having a different length embodying the present invention is attached to a grip end portion of the shaft. FIG. 4 is a view showing a table comparing numerical data of a golf club provided with a shaft length adjusting parts set embodying the present invention and a normal re-shaft club. FIG. 5 is a cross-sectional view showing a shaft length adjusting part for a golf club according to another embodiment of the present invention. FIG. 6 is a perspective view showing a cross-section of a main body portion of a shaft length adjusting part of a golf club according to another embodiment of the present invention.

  The present invention is "a golf club shaft length adjusting part that can be detachably attached to the grip end side of a golf club shaft, and the overall weight of the golf club set according to the golf club shaft length and Parts, parts set and shaft for adjusting the shaft length of a golf club, characterized in that the weight, weight balance, and dimensions in the axial direction are set so as to obtain almost the same overall weight and swing weight as the swing weight It is a “golf club provided with a part for adjusting the length”, and can be suitably embodied by the embodiment described below.

  Hereinafter, an embodiment of a golf club provided with a shaft length adjusting part, a parts set, and a shaft length adjusting part of a golf club embodying the present invention will be described.

  Examples of golf clubs that can embody the present invention include a fairway wood and an iron club, as well as a driver W1 as shown in FIG. 1. The golf club shaft length adjusting parts and parts set embodying the present invention are these It is detachably attached to the grip end portion of the golf club.

  The golf club W1 shaft length adjusting parts 10, 20, and 30 have a bottomed cylinder that is continuous with the grip end in accordance with the shape of the grip 60 that is enlarged toward the base end side in order to make it easy to grip without a sense of incongruity. Body parts 11, 21, 31 made of aluminum alloy and male screw parts 12, 22 integrally formed so as to extend from the center of one end part on the bottom side of the body parts 11, 21, 31. , 32.

Further, the shaft length adjusting parts 10, 20, and 30 are provided with flange portions 13, 23, and 33 in which the outer diameter of the end portion on the grip end side is further enlarged smoothly, so that the contact with the hand and gloves is eased. At the same time, it acts as a slip stopper.
The main body parts 11, 21, 31, the male screw parts 12, 22, 32 and the flange parts 13, 23, 33 of the shaft length adjusting parts 10, 20, 30 are cut out from an aluminum alloy by machining. They can be manufactured in one piece, and therefore do not require a resin molding process or assembly work.
The flange portions 13, 23, and 33 may be omitted from the viewpoint of appearance design or golf rule conformity as shown in FIG.

  Furthermore, the shaft length adjusting parts 10, 20, 30 in this embodiment are fitted in accordance with the inner peripheral surface of the grip end side end portion of the shaft 50, and are made of an aluminum alloy and fixed with an adhesive. It includes a sleeve 40 as an additional component, which is formed on the inner surface of a female screw portion 42 that is screwed with the male screw portions 12, 22, 32.

Here, the main body parts 11, 21, 31 are golfed from the male screw parts 12, 22, 32 and a sleeve 40 having an internal thread part 42 threadedly engaged with the male screw parts 12, 22, 32. A connecting means for fixing to the grip end side end portion of the club shaft 50 is configured.
As an example, the golf club shaft length adjusting parts set of this embodiment is changed to three lengths of “medium”, “short”, and “long” which are different in length by 1 inch (2.54 cm). Specifically, as an example, the first shaft length adjusting part 10 for making the length of the shaft 45.5 inches and the first for making the size 44.5 inches 2 shaft length adjusting parts 20, a third shaft length adjusting part 30 for making the size 46.5 inches, and a sleeve 40.

Further, the main body parts 11, 21, 31, male screw parts 12, 22, 32 and the sleeve 40 are made of an aluminum alloy in the embodiment described above, so that they are lightweight and excellent in strength, and are CNC lathes. Even a small amount using a small size and a finely tuned weight balance are inexpensive and can be easily and quickly precision processed.
Therefore, even if the lengths of the main body portions 11, 21, 31 are changed to the three sizes as described above, the overall weight of the golf club can be substantially maintained and adjusted to an appropriate weight balance. Become.

  In the shaft length adjusting parts set according to the present invention, each part may be designed by considering the length of the shaft between the short size and the long size when changing the shaft length as the standard length. Therefore, the part set for adjusting the shaft length of the golf club of this embodiment is designed with the length of each part, weight balance, etc., assuming that the shaft length is 45.5 inches as the standard length.

However, in the case of a shaft length adjusting parts set that only changes two sizes, it is only necessary to design each part by considering one of the lengths as a standard length.
Furthermore, when designing the shaft length adjusting parts set of the present invention, it is desirable to secure the length of the main body at least about 1 cm so that the main body can be turned by hand and screwed to the shaft side. . However, the main body may be turned using a tool by providing a hexagonal hole or a cross groove on the inner bottom of the main body.

Next, an embodiment of a golf club shaft length adjusting part set embodying the present invention will be described (see FIG. 2). In this embodiment, the standard length of the golf club shaft is designed to be 45.5 inches.
First, in order to manufacture the golf club W1 corresponding to the shaft length adjusting parts set of the present invention described above, the grip end side of the grip 60 is cut to about 43 mm shorter, and the grip end side of the golf club shaft 50 is also standard. Cut about 41 mm shorter than the length of the golf club.
The weight Gp of the grip end separated from the grip having a normal weight (50 grams) corresponding to the length L1 of about 43 mm is about 17 grams, and the length L1 of about 41 mm, which is substantially equal to the length L1. The weight St of the shaft separated by 'is about 3 grams.

After shortening the length of the shaft 50 and the grip 60 having a normal weight as described above, the grip 60 is attached to the shaft 50.
In addition, in order to be able to attach the shaft length adjusting part of the present invention to a golf club that has already been fitted with a grip, it was cut in a similar manner to a shaft that had the grip end side cut after removing the grip. A grip may be attached.

The length in the axial direction of the first main body 11 of the first shaft length adjusting part 10 for setting the golf club shaft to the standard length of 45.5 inches is defined as the first predetermined dimension L1. The weight of the shaft length adjusting part 10 is about 16 grams.
A sleeve 40 is fixed to the grip end side end portion of the golf club shaft 50 with an adhesive. The sleeve 40 is an aluminum alloy cylindrical body having an internal thread portion 42 on the inner surface, and is set to have a length of about 35 mm and a weight Sv of about 4 grams.

Next, the axial length of the second main body portion 21 of the second shaft length adjusting part 20 for making the golf club shaft 50 44.5 inches shorter than the standard length is set to a second predetermined dimension L2. About 18 mm and weighs about 15 grams.
As shown in FIG. 3A, the bottom of the second main body portion 21 is made thick in consideration of the weight balance. That is, the depth of the cylindrical portion of the main body portion 21 is reduced.

Furthermore, the axial length of the third main body 31 of the third shaft length adjusting part 30 for making the golf club shaft 50 46.5 inches longer than the standard length is defined as a third predetermined dimension L3. The weight is about 69 mm and the weight is about 17 grams.
As shown in FIG. 3C, the male thread portion 32 of the third main body portion 31 has a hollow cylindrical shape in consideration of the overall weight, strength, weight balance, and the like.

  The thickness of the main body portions 11, 21, 31 of the shaft length adjusting parts 10, 20, 30 takes into account the weight balance and strength to obtain an appropriate swing weight and moment of inertia corresponding to the length of the golf club shaft. And about 1 mm. And although the surface of the main-body parts 11, 21, 31 is not provided with a coating or a film | membrane, you may provide a thin coating, a rubber | gum film | membrane, etc. in the range which does not destroy a whole weight or the whole weight balance.

Since the main body parts 11, 21, 31 formed of the aluminum alloy in a cylindrical shape as described above are thin, the weight of each of the shaft length adjusting parts 10, 20, 30 and the main body parts 11 thereof. , 21 and 31 are as follows, and the overall weight hardly changes even if the length is changed. Therefore, the swing weight and the moment of inertia of the golf club W1 can also be appropriate according to the length of the golf club.
More precisely, the overall weight of the golf club W1 increases by about 1 gram as the shaft becomes longer, and more accurately matches the swing weight and moment of inertia of a golf club having a shaft of an individual length. I am doing so.

Shaft length adjustment part 10 body part and male thread part weight about 16 grams, body part length about 43mm
Shaft length adjustment part 20 body part and male thread part weight about 15 grams, body part length about 18mm
The body length and male thread of the shaft length adjustment part 30 are about 17 grams and the body length is about 69mm.
Further, the following relationship is established between the weights Gp, St, and Sv.
Gp = 17 grams, St = 3 grams, Sv = 4 grams,
Gp + St = 20 grams, the value is
It becomes substantially equal to the value of 19 to 21 grams, which is the weight of the main body portion and the male screw portion of the shaft length adjusting part + Sv.

  Further, as shown in FIG. 3D, a step is formed on the inner surface of the main body portions 11, 21, 31 of the shaft length adjusting parts 10, 20, 30 to adjust the weight balance, or a cap is provided at the opening end portion. 70 may be fitted, or the inner bottom portion of the main body 31 may be closed as shown in FIG.

FIG. 4 shows the above-described embodiment of the golf club provided with the shaft length adjusting part embodying the present invention, and numerical values relating to the re-shaft club having a predetermined length by cutting the shaft by a normal method. Data are described in comparison.
The head weight of the golf club described in the table is 198 grams, the grip weight before cutting is 43 grams, the grip weight after cutting is about 30 grams, and the shaft length adjustment parts are not used. A normal golf club (re-shaft club) has a grip weight of 50 grams.
When a grip that is lighter than the usual grip weight of 50 grams as described above is used, it is possible to secure more α grams of weight that can be used for the shaft length adjustment part. It is possible to increase the degree of freedom for adjusting the strength, adjusting the size, and changing the appearance of the adjustment parts.
That is, for example, by using a grip of 43 grams that is 7 grams lighter than the usual 50 grams, it is possible to use a weight (Gp + St + α) that is 3 grams more as an α gram for the shaft length adjusting part.
FIG. 4 shows numerical data when a shaft length adjusting part embodying the present invention is applied to shafts having different weights.

A method of using the parts for adjusting the shaft length and the parts set of the golf club configured as described above will be described.
In order to obtain the golf club W1 having the shaft 50 having the standard length of 45.5 inches, the male screw 42 of the first shaft length adjusting part 10 is connected to the female screw portion 42 of the sleeve 40 fixed to the grip end side. The part 12 is screwed together.
In this case, the shaft length adjusting part 10 can be easily attached to the end portion of the shaft 50 and securely fixed by manually operating and turning the main body 11 of the shaft length adjusting part 10.

The golf club W1 to which the shaft length adjusting part 10 is mounted as described above has a total weight of about 289 grams, a swing weight of about C8.3, and a moment of inertia when a lightweight class shaft of about 40 grams is used. Becomes a golf club of 2237230.
The golf club W1 is substantially the same as the total weight of the golf club having a shaft length of 45.5 inches from the beginning, and the swing weight and the moment of inertia are 45.5 inches from the beginning. This is almost the same as the swing weight and moment of inertia of the golf club.

  The first shaft length adjusting part 10 is removed by turning the first main body 11 by hand. Instead, the male screw part 22 of the second shaft length adjusting part 20 is attached to the female screw part 42 of the sleeve 40. When engaged, a golf club W1 having a shaft 50 length of 44.5 inches, an overall weight of about 288 grams, a swing weight of about C3.0, and an inertia moment of 2123206 can be obtained.

  Similarly, when the male screw portion 32 of the third shaft length adjusting part 30 is screwed into the female screw portion 42 of the sleeve 40, the length of the shaft 50 is 46.5 inches, the total weight is about 290 grams, and the swing weight Is approximately D3.6, and a golf club W1 having a moment of inertia of 2355010 can be obtained.

  As described above, even if the shaft length is changed to 45.5 inches, 44.5 inches, or 46.5 inches, the overall weight, swing weight, and moment of inertia of the golf club use parts for adjusting the shaft length. Instead, the overall weight, swing weight, and moment of inertia of each golf club manufactured by cutting the shaft into those lengths from the beginning are almost the same.

Therefore, a golf club having the same performance as those golf clubs can be easily obtained from one golf club W1 without preparing golf clubs having three lengths. In addition, since the portion where the shaft bends is not processed, the original performance and feeling of use of the shaft are not impaired.
In the above embodiment, the length can be changed in increments of 1 inch. However, in order to meet the desire to confirm a finer fitting, the length of the main body portion changed in increments of 0.5 inches is used. It may be embodied as a parts set consisting of parts for adjusting the shaft length having a size.

  In the present specification, a sleeve having an internal thread portion formed on the inner surface is added as a component of the shaft length adjusting part of the present invention, but the golf club already has an internal thread portion on the shaft. On the other hand, a sleeve is unnecessary, and the sleeve may not be included as a component constituting the shaft length adjusting part of the present invention.

The present invention is not limited to the above-described embodiments, and the weight, shape, dimensions, etc. of the respective parts of the golf club, the golf club shaft length adjusting part, and the parts set are appropriately set within the scope of the present invention. You may change and implement.
That is, the weight of the shaft length adjusting part of the present invention has an allowable range of about −3 to +3 grams within a range that does not substantially affect the values of the swing weight and the moment of inertia of the golf club.

Further, for example, as shown in FIG. 5 (a), the male thread portion is further extended to the club head side, and a hammer-like or rod-like heavy article 34 is arranged in the shaft, or as shown in FIG. 5 (b). The weight balance and the moment of inertia may be adjusted by fixing an annular weight 35 to the grip end side end of the main body.
Conversely, as shown in FIG. 5C, a through hole 36 may be provided in the main body to adjust the weight balance of the main body.
Further, as shown in FIG. 5 (d), in order to increase the strength of the bases such as the male screw portions 32 and 12, reinforcement made of a metal or FRP having a high strength with respect to the bases such as the male screw portions 32 and 12 or the like. The material 32a may be embedded and bonded.

The shaft length can be adjusted by changing the thicknesses of the main body parts 11, 21, 31 of the embodiments and examples described above, the depth of the cylindrical part, the change rate (taper) of the outer diameter or inner diameter, and the like. It is possible to control the weight and center of gravity of the parts 10, 20, and 30 for the golf club, and the entire body is made of an aluminum alloy that is lightweight and excellent in strength. The length can be changed.
Moreover, since the main-body parts 11, 21, and 31 of the embodiment and Example which were demonstrated above are cylindrical, and an edge part is an open state, a lead tape is stuck on the inner surface and finer weight adjustment and gravity center adjustment are carried out. It can also be done.

  In the golf club shaft length adjusting parts and parts set of the present embodiment, as materials constituting each member, considering strength, durability, weight, mass productivity, manufacturing cost, ease of processing and accuracy, Although an aluminum alloy is used for machining, other light metals, metal alloys, and the like may be used as long as the materials have similar physical performance.

  For example, materials such as PPS (polyphenylene sulfide), which is a high-strength resin that can be processed to the same level as metal, can be increased in strength by adding glass and carbon fibers and powders. The golf club shaft length adjusting part and parts set of the golf club of the present invention may be manufactured and implemented. In this case, the weight can be reduced as compared with the case of using an aluminum alloy, and a thick rubber film (coating) can be formed around the main body.

Furthermore, when a rubber film is formed on the main body of the shaft length adjusting part of the golf club, the material of the shaft length adjusting part should be light as described above, and as shown in FIG. By reducing the outer diameter of the main body of the length adjustment part, increasing the wall thickness, and having substantially the same cross-sectional area, it may not be a problem in strength even if the rubber film 37 is provided. it can.
That is, the cross-sectional areas of the main body portions 31 (11, 21) made of aluminum alloy or high-strength resin of the shaft length adjusting parts shown in FIGS. 6 (a) and 6 (b) are substantially the same.

  In addition, the body portion of the golf club shaft length adjusting part of the present invention may be provided with an anti-slip effect by subjecting the surface to irregularities and grain coating within a range that does not destroy the overall weight and weight balance. In addition, a sound absorbing material may be arranged inside or subjected to uneven processing to prevent resonance.

As shown in the table in the center of FIG. 4, when the shaft length adjustment part is manufactured with the same thickness titanium alloy or CFRP (carbon fiber reinforced plastic) as that of the aluminum alloy, Since the swing weight and moment of inertia will be out of order, it is not possible to make the weight and balance appropriate by reducing the thickness in the case of titanium alloy and increasing the thickness in the case of CFRP. In principle it is possible.
However, manufacturing shaft length adjustment parts with titanium alloy or CFRP not only causes material and processing cost problems, but titanium is also difficult to cut due to severe tool wear and thin cutting. However, there is a problem that the shape of the parts is too complicated to manufacture by stacking CFRP.

  The present invention provides a golf club and a golf that can be easily lengthened, shortened, or returned to the original length without changing the shaft of the golf club or impairing its performance or feeling of use. It can be suitably used as a club shaft length adjusting part and a parts set.

10 Golf club first shaft length adjustment part (for 45.5 inches)
11 First body portion 12 Male thread portion 13 Flange portion 20 Golf club second shaft length adjustment part (for 44.5 inches)
21 Second body portion 22 Male screw portion 23 Flange portion 30 Golf club third shaft length adjustment part (for 46.5 inches)
31 Third body part 32 Male thread part 32a Reinforcing material 33 Flange part 34 Rod-like heavy object 35 Annular heavy object 36 Through hole 37 Rubber coating (coating)
40 Sleeve 42 Female thread part 50 Shaft 60 Grip 70 Cap Gp Weight of the separated grip end corresponding to the length L1 L1 Length (first predetermined dimension)
L1 'Length to cut the shaft extra L2 length (second predetermined dimension)
L3 length (third predetermined dimension)
St Weight of shaft separated to correspond to length L1 Sv Weight of sleeve W1 Golf club (driver)

Claims (5)

A golf club shaft length adjustment part that can be detachably attached to the grip end side of the golf club shaft,
The weight, weight balance, and axial dimensions are set so that the overall weight and swing weight are almost the same as the overall weight and swing weight of the golf club set according to the shaft length of the golf club. Parts for adjusting the shaft length of a golf club. Parts for adjusting the golf club shaft length that can be detachably attached to the grip end side of the golf club shaft;
A grip with a Gp gram weight reduced by cutting the grip end side shorter than a standard length golf club,
A golf club shaft that is cut by shortening the grip end side from the standard length golf club to reduce the St gram weight,
A golf club comprising
The weight of the shaft length adjusting part is set to “Gp + St” grams,
A shaft length adjustment part with a weight balance and dimensions in the axial direction is provided so that the swing weight of the golf club set according to the golf club shaft length can be obtained. A golf club characterized by that. A golf club shaft length adjustment part set that can be detachably attached to a grip end of a golf club shaft and a grip end cut shorter than a standard length golf club,
A first body portion having a first predetermined dimension L1 in the axial direction in order to set the golf club shaft to a standard length;
A connecting means for connecting to the golf club shaft formed at one end of the first main body,
The grip end side grip weight Gpgram corresponding to the length corresponding to the first predetermined dimension L1 and the grip end side shaft corresponding to the length corresponding to the first predetermined dimension L1 are shortened. The first shaft length that has a weight “Gp + St” gram with a weight St gram, and whose weight balance is set so as to obtain a swing weight that is substantially the same as the swing weight of a standard length golf club Adjustment parts,
A second body portion having a second predetermined dimension L2 in the axial direction in order to make the golf club shaft a length different from the standard length;
A connecting means for connecting to the golf club shaft formed at one end of the second main body,
Weight so as to obtain substantially the same swing weight as that of a golf club having a weight substantially equal to the weight “Gp + St” gram and having a length different from the standard length corresponding to the second predetermined dimension L2. A part set for adjusting the shaft length of a golf club, comprising: a second shaft length adjusting part for which a balance is set.   The connecting means includes a male screw part formed at one end of the main body part and a sleeve fixed to an inner peripheral surface of a grip end side end part of the shaft, and a female screw screwed into the male screw part 4. The golf club shaft length adjusting parts set according to claim 3, wherein said golf club shaft length adjusting parts set is formed of a sleeve having an inner surface formed therein.   3. The grip portion is reduced in weight by “Gp + α” grams by using a grip that is lighter than a normal weight grip, and the weight of the shaft length adjusting part is set to “Gp + St + α” grams. Golf club.

Images