JP5817200B2 - Golf club shaft length variable device - Google Patents

Description

  The present invention relates to a golf club shaft length varying device, and more particularly to a golf club shaft varying device that can be used by adjusting the length of the shaft.

  The golf club shaft is set to a standardized length for each manufacturer. For example, in the case of an iron golf club shaft of No. 3 to No. 9, it is set so that it becomes longer by 0.5 inches as the count is reduced. It is designed so that the characteristics of each count can be exhibited well.

  However, even if the length is changed according to the count, the height or skill of the golfer who is the user varies, so even if the length of the shaft is changed for each count, for all golfers It is not always easy to use.

  For example, for those who are tall or want to earn a flight distance, they may want a longer shaft length than the commercially available shaft length, and for those who seek ease of control, the standardized length In some cases, a relatively short shaft may be desired.

  Patent Document 1 proposes a golf club having a variable shaft length. This golf club has a plug at the end of the shaft, a slide cylinder with a grip attached to the outer periphery at the end of the shaft, and a screw that passes through the end plate of the slide cylinder moves forward and backward. By doing so, the grip is moved along the axis of the shaft, whereby the length of the shaft can be made variable.

JP-A-9-201435

  However, in the golf club shaft described in Patent Document 1, the screw has a length similar to the length of the grip, and it is necessary to use a metal screw in strength, so that the weight of the screw itself is high. As a result, the entire shaft becomes relatively heavy. In addition, since the portion causing the increase in weight is biased toward the grip side, the weight balance in the entire length of the shaft is also deteriorated, and there is a disadvantage that the swing control is adversely affected.

  In addition, when a part of the component fails, it is necessary to replace the whole, and there is a problem with a disadvantage in terms of maintenance cost.

[Object of invention]
An object of the present invention is to provide a variable device for a shaft for a golf club that can reduce the increase in weight even when the shaft length is variable, and does not adversely affect the balance of the entire length of the shaft. Another object of the present invention is to provide an economically advantageous golf club shaft variable device that can be repaired by replacing only a corresponding part even if a part of the part fails.

In order to achieve the above object, the present invention adopts the structure described in the claims, and specifically, a nut member fixed to an end of the shaft on the grip mounting side , and the nut member. a spacer is arranged, the said spacer and grip the insertion tube with a bottom surrounding the shaft outer peripheral side while receiving with the grip mounting side and the nut member of the shaft, in a state of penetrating the bottom surface of the grip insertion tube A bolt that penetrates the spacer and is fastened to the nut member, and a grip that is attached to the outer periphery of the grip insertion tube,
By replacing the spacer received in the grip with a spacer having a different length, the attachment position of the grip is changed in the axial direction together with the grip insertion tube, so that the shaft length can be variably provided. Is adopted.

  In the present invention, the spacer is preferably formed of a molded product made of a synthetic resin material.

  In addition, a plurality of bolts are provided, and the spacers have different lengths for each spacer.

According to the present invention, the spacer is disposed between the nut member and the grip insertion cylinder, and the shaft length is made variable depending on the length of the spacer. Therefore, it is sufficient to use a bolt corresponding to the spacer. Therefore, the weight can be suppressed as compared with the conventional type bolt, and even if the shaft length is variable, a disadvantage such as an increase in weight can be avoided. Such avoidance of weight increase can keep the balance of the shaft well, and does not affect the ease of swinging.
Moreover, an increase in weight can be effectively avoided by using resin as the spacer. Furthermore, even if damage such as cracking of the spacer occurs, it is sufficient to replace only the spacer, and the maintenance cost can be reduced.

The principal part sectional drawing which shows the state by which the grip is mounted | worn with the edge part of the shaft for golf clubs via the spacer. The principal part sectional drawing which shows the state which set the shaft length for golf clubs long using the spacer from which length differs.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the vertical dimension (thickness) is doubled and expanded with respect to the horizontal dimension (length) for easy understanding of the contents.

  As shown in FIG. 1, the golf club shaft length varying device in the present embodiment includes a nut member 11 that is fixed to the grip mounting side of the shaft 10, and a spacer 13 that is juxtaposed with the nut member 11. A bottomed grip insertion tube 15 positioned on the outer peripheral side of the end of the shaft 10 in a state where the spacer 13 is received, and a bolt 18 fastened to the nut member 11 while penetrating the bottom surface 16 of the grip insertion tube 15. And a grip 19 attached to the outer periphery of the grip insertion cylinder 15.

  The end portion of the shaft 10 is formed in a polygonal shape, and the nut member 11 is provided in a polygonal shape corresponding thereto. A protrusion 11 </ b> A is formed on the right end side of the nut member 11 in FIG. 1, and the protrusion 11 </ b> A is provided in a recess 13 </ b> A formed on the left end side of the spacer 13. The nut member 11 is fixed to the shaft 10 by means such as welding.

  The spacer 13 is a molded product integrally formed of a synthetic resin material. The spacer 13 is formed of a cylindrical body having a bolt insertion passage 21 formed at the center, and is provided in a shape having a convex portion 13B at the center on the right end side in FIG.

  The grip insertion cylinder 15 includes an end portion of the shaft 10 and a cylindrical portion 17 that receives the spacer 13, and a bottom surface 16 that is located on the right end side in FIG. 1 of the cylindrical portion 17. A through hole 23 for inserting the bolt 18 is formed. The grip insertion cylinder 15 is the same as the material of the shaft 10, and carbon is used in this embodiment.

  The grip 19 is provided in a shape having an operation hole 19A for operating the head 18A of the bolt 18.

  As shown in FIG. 2, a plurality of types of spacers 13 having different lengths are prepared. By using bolts 19 corresponding to the lengths of the spacers 19, grip insertion cylinders 15 for the shaft 10 are used. The mounting position, that is, the insertion depth of the shaft 10 is changed, whereby the overall length of the shaft 10 can be changed.

Therefore, according to such an embodiment, it is possible to change the setting of the shaft 10 to be longer by using the spacer 13.
In addition, when a golf club shaft with a standardized length including the spacer 13 is distributed in the market, the length of the shaft may be set shorter by changing to a spacer smaller than the spacer. It becomes possible.
Therefore, the golf club can be easily changed by changing the shaft length for each golfer. At this time, the weight of the shaft does not increase so much, and there is no inconvenience that the balance of the shaft changes drastically.

The best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this.
That is, although the present invention has been particularly shown and described with respect to specific embodiments, it should be understood that the present invention is not limited to the embodiments described above without departing from the scope of the technical idea and object of the invention. The trader can make various changes.

For example, in the above embodiment, the spacer 13 is made of synthetic resin. However, if the length of the spacer 13 is short, it is not hindered from being made of metal.
Further, the bolt 18 does not need to be changed for each spacer 13 having a different length, and can be used in common as long as the spacer is within a range in which the nut member 11 can be fastened.

  DESCRIPTION OF SYMBOLS 10 ... Golf club shaft, 11 ... Nut member, 13 ... Spacer, 15 ... Grip insertion cylinder, 16 ... Bottom part, 18 ... Bolt, 19 ... Grip

Claims (3)

A nut member fixed to an end portion of the shaft on the grip mounting side , a spacer arranged in parallel with the nut member, and surrounding the shaft outer peripheral side in a state where the spacer is received together with the grip mounting side of the shaft and the nut member. A bottomed grip insertion tube, a bolt that passes through the spacer and is fastened to the nut member in a state of passing through the bottom surface of the grip insertion tube, and a grip that is attached to the outer periphery of the grip insertion tube,
By replacing the spacer received in the grip with a spacer having a different length, the attachment position of the grip is changed in the axial direction together with the grip insertion tube, and the shaft length is variably provided. A golf club shaft length varying device.   2. The golf club shaft length varying device according to claim 1, wherein the spacer is formed of a molded product made of a synthetic resin material.   The golf club shaft length varying device according to claim 1, wherein the bolt includes a plurality of bolts and has a different length for each spacer.

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