JP2014113251A - Golf club and method for adjusting characteristics thereof - Google Patents

Abstract

Provided are a golf club and a head capable of easily changing shafts and adjusting characteristics such as a lie angle, a slice angle, and a progression, and a method for adjusting the characteristics.
A golf club has a shaft 4 attached to a hosel column 3 of a head 1 via a shaft case 5 and a grooved ring 8. A shaft case 5 is fixed to the tip of the shaft 4 using an adhesive. The grooved ring 8 is inserted into the hosel column 3 and fixed by welding. The shaft case 5 is inserted into the hosel column 3 and fixed with bolts 7 through a grooved ring 8. A partition plate portion 6 is provided in the hosel column 3. The bolt 7 is screwed into the female screw hole 5 m of the shaft case 5 through the bolt insertion hole 6 a of the partition plate portion 6. The splines of the grooved ring 8 and the shaft case 5 are engaged with each other.
[Selection] Figure 3

Description

  The present invention relates to a golf club, and more particularly to a golf club capable of easily adjusting characteristics such as a lie angle, a slice angle, and a progression. The present invention also relates to a method for adjusting the characteristics of the golf club.

  A golf club has a head attached to the tip of a shaft. A grip is attached to the proximal end of the shaft.

  In a conventional general golf club head, a hosel hole is provided directly in the head, and a shaft is inserted into the hosel hole and fixed by an adhesive. In general, an epoxy adhesive is used as the adhesive. When exchanging the shaft, the shaft can be pulled out by heating the hosel part to break the structure made of the cured epoxy resin.

  In such a conventional general golf club head, it takes time to replace the shaft. In addition, characteristics such as lie angle, slice angle, and progression cannot be adjusted.

  Patent Document 1 describes a golf club that can easily exchange shafts and adjust characteristics such as a lie angle, a slice angle, and a progression, and a method for adjusting the characteristics. The head of the golf club disclosed in Patent Document 1 is a golf club having a head attached to the tip of a shaft, and the shaft tip is inserted into and fixed to a shaft insertion hole of a shaft case. The shaft case is inserted into the case insertion hole, and the shaft case is detachably fixed to the hosel column by a bolt inserted from the sole side.

  In the golf club of Patent Literature 1, the shaft case can be fixed or removed from the hosel mounting hole by attaching and detaching the bolt. Therefore, the circumferential phase of the shaft case is changed, and the shaft case is mounted on the head body again with bolts.

  Therefore, when the shaft axis is inclined with respect to the axis of the hosel insertion hole, by changing the circumferential phase of the shaft case, a golf club consisting of the same shaft and the same head body is used. Only the lie angle or slice angle can be adjusted.

  Also, in the case of a shaft case in which the axial center position of the shaft case insertion hole is eccentrically displaced parallel to the axial position of the hosel, by changing the circumferential phase of the shaft case, the exact same shaft and the same shaft In the golf club comprising the head main body, the progression and the distance from the shaft to the center of gravity (center of gravity distance) can be adjusted.

  Furthermore, in Patent Document 1, a shaft case of exactly the same type is prepared as a shaft case, and a shaft with a different characteristic is fixed to the shaft case as a shaft case / shaft coupling body. A golf club having a different shaft only can be obtained by replacing the head shaft case / shaft assembly so far and attaching it to the hosel of the head.

A similar golf club is also described in Patent Document 2.
In the golf club of Patent Document 1, a spacer having a pyramid hole is used to prevent the shaft case from rotating. In the golf club of Patent Document 2, the inner peripheral surface of the inner portion of the inner hole of the hosel hole is processed into a regular hexagon, and the tip end portion of the shaft case is processed into a hexagon so as to prevent rotation of the shaft case.

JP 2012-165864 A JP 2006-42951 A

In the golf club of Patent Document 1, a spacer having a pyramid hole is used to prevent the shaft case from rotating, and high-precision processing is required and the cost is high.
In the golf club of Patent Document 2, it is necessary to process the inner peripheral surface of the inner portion of the inner hole of the hosel hole into a regular hexagon, which requires high-precision processing and is expensive.
The present invention allows easy exchange of the shaft, and can adjust the characteristics such as the lie angle, the slice angle, and the progression, and has a lower manufacturing cost than Patent Documents 1 and 2, and the characteristic adjustment. It aims to provide a method.

  The golf club of the present invention is a golf club having a head attached to the tip of a shaft, and a substantially cylindrical shaft case is fixed to the tip of the shaft, and the shaft case is inserted into the hosel column of the head, In the golf club in which the shaft case is fixed to the hosel column, a partition plate portion is provided in the hosel column, and a plurality of grooves extending in the axial direction of the inner hole are provided in the inner peripheral surface of the inner hole. A grooved ring is installed on the upper side of the partition plate portion, and a convex shaft portion is provided at the tip of the shaft case. The convex shaft portion has a prismatic shape or extends axially on the outer peripheral surface. The protruding shaft portion is provided, the protruding shaft portion is inserted into the inner hole of the grooved ring, and the corner edge of the protruding shaft portion or the protruding row is engaged with the groove of the grooved ring. Bolt insertion hole provided in the partition plate Bolts inserted from the sole side of the head against is screwed to the shaft case, thereby it is characterized in that the shaft case is fixed to the hosel column.

  In one aspect of the present invention, a female screw hole is provided in the tip surface of the convex shaft portion, and the bolt is screwed into the female screw hole.

  In one aspect of the present invention, the axis of the shaft is inclined with respect to the axis of the cylindrical portion.

  In one aspect of the present invention, the axis of the shaft and the axis of the cylindrical portion are parallel.

  In one embodiment of the present invention, grooves with different depths from the upper end are provided in the grooved ring.

  A method for adjusting the characteristics of a golf club according to an aspect of the present invention is a method for adjusting the characteristics of the golf club of the present invention, wherein the bolt is removed to separate the convex shaft portion of the shaft case from the grooved ring, After the shaft case is rotated, the convex shaft portion of the shaft case is again engaged with the grooved ring and fixed by the bolt.

  According to another aspect of the present invention, there is provided a method for adjusting characteristics of a golf club, wherein the shaft of the golf club according to the present invention is replaced with a new shaft to adjust the characteristics, and the new shaft is fixed to a new shaft case in advance. A new shaft case / shaft assembly is created, the shaft case / shaft assembly attached to the golf club is removed from the head, and a new shaft case / shaft assembly is attached to the head. It is what.

  In the golf club of the present invention, the shaft case is inserted into the hosel column, and the shaft case is fixed by a bolt inserted from the sole side. In the golf club of the present invention, a grooved ring is installed on the upper side of the partition plate portion provided in the hosel column. Since the corner edge or convex line of the convex shaft portion at the tip of the shaft case is engaged with the groove of the inner hole of the grooved ring, the shaft case is positioned in the circumferential direction.

  In the golf club of the present invention, when the bolt is loosened and removed, the convex shaft portion of the shaft case can be extracted from the grooved ring and rotated in the circumferential direction to change the direction (phase in the circumferential direction). Therefore, for example, when using a shaft case in which the shaft center is in an oblique direction (for example, an oblique direction) with respect to the shaft case insertion hole, by changing the circumferential phase of the shaft case The shaft mounting direction with respect to the head body is changed, and the lie angle and slice angle are changed. Thereby, in the golf club which consists of the completely same shaft and the same head main body, only a lie angle or a slice angle can be adjusted.

In addition, when using a shaft case in which the shaft center position of the shaft case insertion hole is shifted parallel to the axis position of the hosel insertion hole, the circumferential direction phase of the shaft case is changed. In a golf club composed of exactly the same shaft and the same head body, the progression and the distance from the shaft to the center of gravity (center of gravity distance) can be adjusted.
In addition, when using a grooved ring having grooves with different depths from the upper end, the insertion depth of the shaft case into the grooved ring can be reduced by changing the circumferential phase of the shaft case. You can change and change the total length of the golf club.

  In the present invention, a shaft case of exactly the same type is prepared as a shaft case, and a shaft with a different characteristic is fixed to the shaft case as a shaft case / shaft coupling body. A golf club with a different shaft can be obtained by replacing the head case with the shaft case / shaft assembly and attaching it to the hosel of the head.

It is a front view of the head concerning an embodiment. It is a side view of the heel side of a head. It is the III-III sectional view taken on the line of FIG. It is a disassembled perspective view of a golf club. It is sectional drawing of a grooved ring. It is a perspective view which shows the manufacturing method (welding method of a grooved ring) of a golf club head. It is a perspective view which shows the manufacturing method (welding method of a grooved ring) of a golf club head. It is sectional drawing which shows embodiment. It is a block diagram of the hosel column used for embodiment, (a) A figure is a front perspective view, (b) A figure is a front view, (c) A figure is CC sectional view taken on the line of (b), (d) The figure is a view from arrow D in (a), (e) is a view from arrow E in (a), and (f) is a rear view of the hosel column. It is a perspective view which shows the manufacturing method of a head. It is sectional drawing which shows another embodiment. It is a perspective view which shows another shape of a convex-axis part. It is a perspective view which shows another shape of a convex-axis part. It is a perspective view which shows another shape of a convex-axis part. The grooved ring of another structure is shown, (a) A figure is a perspective view, (b) A figure is the BB sectional drawing of the (a) figure. FIG. 16 is a cross-sectional view of a portion similar to FIG. 3 of a golf club using the grooved ring of FIG.

  Hereinafter, embodiments will be described with reference to the drawings.

  1 to 10 show a golf club according to a first embodiment. 9 shows the diameter / length ratio larger than that of the hosel column of FIGS. 1 to 8 in order to clearly show the inclination of the inner hole of the hosel column.

  In this golf club, a shaft 4 is attached to a hosel column 3 of a head 1 via a shaft case 5, a grooved ring 8 and a bolt 7.

  The head 1 is of a hollow wood type and includes a face portion 1a, a crown portion 1b, a sole portion 1c, a toe portion 1d, a heel portion 1e, a back portion 1f, and a hosel portion 1g.

  As shown in FIG. 3, a hosel portion 1g is provided on the face portion 1a side and the heel portion 1e side of the crown portion 1b. The hosel column 3 is connected to the hosel portion 1g and extends to the sole portion 1c. The hosel column 3 has a cylindrical pipe shape, and a partition plate portion 6 perpendicular to the axial direction is provided in the middle of the inner hole in the longitudinal direction (axial direction). A grooved ring 8 is disposed above the partition plate portion 6. A shaft case 5 is inserted above the partition plate portion 6. Bolts 7 are inserted from below into the bolt insertion holes (openings) 6 a provided in the partition plate portion 6 and screwed into the female screw holes 5 m of the shaft case 5.

  As shown in FIGS. 3 to 6 and 9, the shaft case 5 is a cylindrical member having an outer diameter that is slightly smaller than the inner diameter of the hosel column 3, and the shaft 4 is inserted from the upper end side toward the lower end side. A hole 5h is provided. The shaft 4 is inserted into the shaft insertion hole 5h and fixed to the shaft case 5 with an adhesive. The depth of the shaft insertion hole 5h is preferably 10 mm or more, for example, 10 to 50 mm, particularly about 20 to 40 mm.

  An outwardly flanged flange portion 5 b is provided at the upper end (rear end) of the shaft case 5. The flange portion 5b has an annular plate shape, but may have a tapered shape with a smaller diameter toward the upper side, and is not limited thereto.

  A projecting shaft portion 5a having a quadrangular prism shape projects from the lower portion (tip portion) of the shaft case 5. The axis of the convex shaft portion 5 a is the same as the axis of the outer peripheral surface of the shaft case 5. The cross section perpendicular to the axial direction of the convex shaft portion 5a is a square. As shown in FIG. 9, a groove 5e is provided around the base portion of the convex shaft portion 5a.

  A female screw hole 5m is provided so as to be recessed in the axial direction from the tip surface of the convex shaft portion 5a.

  As shown in FIG. 5, the grooved ring 8 is a ring having a cylindrical outer peripheral shape.

  The inner hole of the grooved ring 8 is a dodecagonal concave polygon. That is, on the inner peripheral surface of the grooved ring 8, twelve concave grooves 8 i are extended in a direction parallel to the axis of the grooved ring 8. The angle of the groove bottom of the concave groove 8i is 90 °, and as shown in FIG. 5B, the four corner edges of the convex shaft portion 5 made of a quadrangular prism engage with the four concave grooves 8i. As is apparent from FIG. 5B, the convex shaft portion 5 can be engaged with the grooved ring 8 by changing its direction by 30 °.

  In the grooved ring 8 of FIG. 5, the inner hole is a dodecagonal concave polygon, but may be an octagonal concave polygon. In this case, the convex shaft portion 5 changes its direction by 45 ° and is locked to the grooved ring.

  In the present invention, the tip of the convex shaft portion may be provided with a taper in order to make it easier to insert the quadrangular prism-shaped convex shaft portion 5a into the concave groove 8i of the grooved ring. An example is shown in FIGS. In the convex shaft portion 5a ′ of the shaft case 5 ′ of FIG. 12, a taper 51 having a shape obtained by obliquely cutting the front end side of the four corners of the quadrangular prism-shaped convex shaft portion 5a ′ is provided. . In the convex shaft portion 5a '' of the shaft case 5 '' of FIG. 13, a taper 52 having a shape obtained by obliquely cutting the entire peripheral edge portion of the front end surface of the quadrangular prism-shaped convex shaft portion 5a '' is provided. .

  The grooved ring 8 is an annular member having a short axial length that is disposed only in the inner part of the hosel column 3 and has a small weight. The grooved ring 8 is inserted into the hosel column 3 and welded to the hosel column 3. This welding method will be described later.

  In order to assemble the golf club, the grooved ring 8 is previously placed on the bottom of the hosel column 3 and welded. Further, as shown in FIG. 4, the shaft case 5 is fixed to the tip of the shaft 4 using an adhesive to form a shaft case / shaft coupling body. Preferably, this adhesive is applied to the outer peripheral surface of the tip portion of the shaft 4 and the shaft 4 is inserted to the innermost portion of the shaft insertion hole 5 h of the shaft case 5. As the adhesive, an epoxy adhesive or the like is suitable.

  As shown in FIG. 3, in this embodiment, the female screw hole 5 m does not penetrate the shaft case 5. In this case, when the shaft 4 is inserted into the shaft insertion hole 5h of the shaft case 5, the air screw hole 5m and the shaft insertion hole 5h communicate with each other so that air flows out through the female screw hole 5m. Small holes may be provided.

  The shaft case 5 of this shaft case / shaft coupling body is inserted into the hosel column 3, the convex shaft portion 5a of the shaft case 5 is inserted into the inner hole of the grooved ring 8, and the rectangular edge of the convex column 5a and the grooved ring are inserted. Eight concave grooves 8i are engaged. Next, the bolt 7 is screwed into the female screw hole 5m through the bolt insertion hole 6a.

  Thereby, the shaft case 5 is fixed to the head 1 as shown in FIGS. Since the shaft case 5 and the shaft 4 are firmly bonded with an adhesive, a golf club in which the shaft 4 and the head 1 are integrated is completed. Since the corner edge of the shaft case 5 is engaged with the concave groove 8i of the grooved ring 8, the circumferential phase of the shaft 4 and the shaft case 5 is accurately determined. Further, the fixed rigidity in the torque direction of the shaft 4 and the shaft case 5 is high.

  In the present invention, the shaft exchange of the golf club can be easily performed. In order to replace the shaft of the golf club, a shaft case of the same type as the shaft case 5 is fixed to the new shaft to be replaced in advance with an adhesive.

  The bolt 7 of the existing golf club is removed, and the old shaft 4 is removed from the head 1 together with the old shaft case 5. Next, a new shaft with a shaft case (shaft case / shaft coupled body) is inserted into the head 1 and fixed with bolts 7.

  In this way, the shaft can be attached and replaced very easily and quickly. In the past, when the shaft was replaced, the hosel part of the existing golf club was heated to break the structure of the cured adhesive, and after the shaft was pulled out, the new shaft was fixed with an adhesive. Although it took about 1 day, in the above embodiment, the shaft can be replaced in several minutes by attaching the shaft case 5 to the new shaft in advance with an adhesive. Accordingly, it is possible to realize a usage system in which shafts of various specifications with a shaft case are prepared, and different shafts are sequentially attached to the same head 1 for trial hitting.

In this embodiment, as shown in FIGS. 8 and 9, the axis of the shaft insertion hole 5h is inclined with respect to the axis of the outer peripheral surface of the shaft case 5, that is, the axis of the hosel column 3, so that the inclination of the shaft 4 can be changed. Yes. Specifically, as shown in FIG. 9 (c), the which obliquely intersects at an angle θ to the axial line a ₂ in the axial line a ₁ of the outer circumferential surface of the shaft case 5 and shaft insertion hole 5h. In a normal case, the angle θ is preferably about 0.1 to 5 °, particularly about 0.25 to 3 °.

  Note that the axial lines do not have to intersect each other and may have a “twisted” relationship. In other words, the two axes may not cross each other and one axis passes through the vicinity of the other axis.

As shown in FIG. 9 (a), on the outer peripheral surface of the flange portion 5b of the shaft case 5, the plane including the axis lines a ₁ and a ₂ intersects with the outer peripheral surface of the flange portion 5b, and A mark “N” indicating a neutral position is provided at a position opposite to the axis center line a ₂ across the axis line a ₁ . Further, a mark “NEUTRAL” made of a word meaning a neutral position is attached below the mark “N” (on the convex shaft portion 5a side). “R” and “RIGHT” are attached to the left of 90 ° from “N” and “NEUTRAL”, and “L” and “LEFT” are attached to the right of 90 °. On the opposite side of the marks “N” and “NEUTRAL”, “U” and “UPRIGHT” are attached. Each of the NEUTRAL, RIGHT, LEFT, and UPRIGHT marks extends in a direction parallel to the axis.

  1 to 3, the mark N and NEUTRAL of the shaft case 5 face the toe side. This state is the standard state of this golf club.

  On the other hand, in FIG. 8, the shaft case is rotated 90 ° in the clockwise direction in the plan view from the state of FIGS. 1 to 3, and the marks L and LEFT face the toe side. That is, the “L” plane in FIG. 9F is facing the toe side. For this reason, in FIG. 8, the axis of the shaft 4 is inclined to the face side with respect to the axis of the hosel column 3. By turning the shaft case 5 by 90 ° or 180 ° from the state shown in FIG. 8, the inclination direction of the shaft 4 can be changed. That is, the shaft 4 can be tilted toward the toe side or tilted toward the back side.

  Thus, the lie angle and the slice angle can be changed by changing the direction of inclination of the shaft 4.

  The lie angle will be described. When the mark N and NEUTRAL are directed to the toe side, the shaft 4 is tilted most toward the heel side, and the flat lie is the smallest. When the mark U and UPRIGHT are directed toward the toe side, that is, when the surface of FIG.

  In terms of the slice angle, the state where the plane (N, NEUTRAL) in FIG. 9B is directed to the toe side is the standard state. In FIG. 8 in which the shaft 4 is inclined to the most face side by directing the marks L and LEFT to the toe side, the face face is the most closed hook face. On the other hand, when the shaft 4 is tilted most rearward with the marks R and RIGHT facing the toe side, a sliced face with the most open face is obtained.

  As described above, by using the shaft case 5 of FIG. 9, the inclination direction of the shaft 4 with respect to the head 1 can be changed, and the lie angle and the slice angle can be changed. In the above description, the direction of the shaft case 5 is changed every 90 °, but may be changed every 30 ° or 45 °. If it does in this way, it can be set as the intermediate state of said each state. For example, the specifications of the golf club can be finely adjusted such as “slightly hook face”, “slightly sliced face”, “slightly upright”.

  The shaft case 5 </ b> A in FIG. 11 is obtained by decentering the shaft insertion hole 5 h from the axial center position of the shaft case 5. The shaft center of the shaft insertion hole 5h is parallel to the shaft center of the outer peripheral surface of the shaft case 5 and slightly separated (for example, 0.5 to 4 mm) therefrom.

  By using this shaft case 5A, the progression of the shaft can be adjusted. For example, as shown in FIG. 11, the shaft 4 can be brought closer to the face side by an eccentric distance than in the case of FIG.

From the state shown in FIG. 11, the bolt 7 is removed and the shaft case 5A is once extracted from the hosel column 3 and rotated 90 °, 180 ° or 270 ° to translate the position of the shaft 4 to the heel side, back side or toe side. Can be changed. By changing the position of the shaft 4 in this way, the distance from the shaft axis to the center of gravity of the head is changed. Further, the progression is changed by setting the position of the shaft 4 to the face side or the back side.
In the above embodiment, the convex shaft portion 5 has a quadrangular prism shape, but may have a triangular prism shape. Moreover, in this invention, it is good also as the convex-shaft part 5a '''which has the multiple ridges 5g on the outer peripheral surface like shaft case 5''' of FIG. The protruding strip 5g extends in a direction parallel to the axis of the protruding shaft portion 5a ′ ″. Other reference numerals in FIG. 14 are the same as those in the above embodiment.
In this invention, as shown in FIG. 15, you may use ring 8 'with a groove | channel which can change the insertion depth of a shaft case.
The grooved ring 8 ′ is provided with 12 grooves 8 i like the grooved ring 8, but only four of them extend from the upper end to the lower end of the grooved ring 8 ′. Four of the remaining grooves 8i extend from the upper end of the grooved ring 8 'to a depth of 2/3 of the grooved ring 8', and the remaining four grooves 8i are formed on the grooved ring 8 '. It extends from the upper end to a depth of 1/3 of the grooved ring 8 '.
When the inner hole of the grooved ring 8 ′ is circulated, those having a depth ratio of 1, 1/3, and 2/3 of the grooved ring 8 ′ are arranged in this order.
As shown in FIG. 16, when the convex shaft portion 5 is abutted against the groove lower end 8g of the groove 8i having a depth ratio of 2/3, the total length of the golf club is 1 / height of the height of the grooved ring 8 '. It will be 3 longer. In this case, a spacer 31 having a length １ ／ of the height of the grooved ring 8 ′ is interposed between the flange 5 b and the upper end of the hosel column 3. Although not shown, when the convex shaft portion 5 is abutted against the groove lower end 8h of the groove 8i having a depth ratio of 1/3, the total length of the golf club is longer by 2/3 of the height of the grooved ring 8 '. Become. In this case, a spacer having a length 2/3 of the height of the grooved ring 8 ′ is interposed between the flange 5 b and the upper end of the hosel column 3.
In this case, if the shaft axis and the hosel column axis are coaxial, only the total length of the golf club is changed by changing the direction of the shaft case 5.

  The grooved ring, shaft case, hosel column, and bolt are preferably made of metal, and particularly preferably made of aluminum, titanium, or an alloy thereof. As the shaft case, an aluminum alloy having an alumite treatment and a high surface hardness so as not to be scratched can be used, but is not limited thereto. As the hosel column, a column made of pure titanium and manufactured by cutting can be used, but is not limited thereto. In an example of the present invention, the inner diameter of the upper end of the hosel column 3 is about 10.5 mm, the inner diameter of the lower end is about 8.5 mm, and the diameter of the screw rod portion of the bolt 7 is about 4 to 5 mm. It is not limited.

The material of the head is not particularly limited, but in the case of a wood type golf club head, for example, a titanium alloy, an aluminum alloy, stainless steel or the like can be used. The titanium alloy used for the face surface is preferably a titanium alloy having a low specific gravity, and Ti-6Al-1Fe or Ti-6Al-2Fe, Ti-6Al-3Fe titanium alloys are preferred. The specific gravity of these titanium alloys is about 4.4. Examples of titanium alloys having a specific gravity of 4.4 include the following.
Ti-8Al-1V-1Mo (specific gravity 4.37)
Ti-7Al-2V (specific gravity 4.35)
Ti-7.5Al-2V (specific gravity 4.35)
Ti-8Al-1V (specific gravity 4.34)
Ti-8Al-2V (specific gravity 4.35)
Ti-8Al-1V-1Mo-0.15C (specific gravity 4.37)
Ti-6Al-1Fe (specific gravity 4.38)

  In addition, as a grip attached to the shaft 4, a grip having a non-circular cross section may be used. For example, the bottom surface of the grip outer peripheral surface that faces the ground in the address state may have a shape that bulges more than other surfaces. In such a case, when the direction of the shaft cases 5 and 5A is changed, the grip bulging portion may not be on the ground side. Therefore, in the present invention, it is preferable to use a grip having a perfectly circular cross section.

  In the above embodiment, the golf club head is of a wood type, but the present invention can also be applied to a utility type golf club head similar to that.

  Next, a method for manufacturing this golf club head will be described.

  In this manufacturing method, as shown in FIGS. 6 and 10, the head main body 10 in which the crown portion and the face portion are open is used. As shown in FIG. 10, the hosel column 3 is integrated with the head body 10 by welding. The hosel column 3 is provided with one or a plurality of holes 11 above the partition plate portion 6. The hole 11 penetrates from the inner peripheral surface of the hosel column 3 to the outer peripheral surface. In this embodiment, the hole 11 is provided with a hole facing the face side and a hole 11 facing the toe side or the back side.

  The grooved ring 8 is attached to the tip of the shaft case 5 and the splines of the shaft case 5 and the grooved ring 8 are engaged with each other. The shaft case 5 with the grooved ring 8 is inserted into the hosel column 3, and the grooved ring 8 is brought into contact with the partition plate portion 6 as shown in FIG. In this state, the hole 11 faces the outer peripheral surface of the grooved ring 8.

  Next, the orientation (phase in the circumferential direction) of the shaft case 5 is adjusted so that the “N” mark provided on the flange 5 b of the shaft case 5 faces the toe side. Thereafter, a welding operation is performed through the hole 11 to weld the hosel column 3 and the grooved ring 8. For this welding, a method of melting and welding both the hosel column 3 and the grooved ring 8 using a TIG (Tig) welding machine or the like can be adopted, but the invention is not limited to this. An arrow W in FIG. 7 indicates the approaching direction of the electrode or the like during the welding.

  After the welding is completed, the shaft case 5 is pulled out from the hosel column 3. The grooved ring 8 remains in the hosel column 3.

  Thereafter, as shown in FIG. 10, the crown portion 1b and the face portion 1a are welded to the crown portion and the face portion of the head body 10 as a closing plate, respectively, and then the front edge of the crown portion 1b and the upper edge of the face portion 1a are welded. To do. Next, finish processing such as deburring and painting is performed. Thereby, the golf club head 1 in which the grooved ring 8 is welded to the inner portion of the hosel column 3 is obtained.

  Note that a plate in which the crown portion 1b and the face portion 1a are integrally formed may be welded to the head body 10. Moreover, you may comprise a part or whole of a crown by CFRP.

  6 and 7, the head main body 10 having an open portion at the crown portion and the face portion is used. However, the head main body having an open portion at the face portion and a part of the sole portion or the heel side portion. May be used. When the hole 11 is provided only on the face part side, a head body in which only the face part is an open part may be used. However, it is preferable to provide a plurality of holes 11 at intervals in the circumferential direction and perform welding at a plurality of locations because the fixing strength of the grooved ring 8 is increased.

  6 and 7, when the grooved ring 8 is welded to the hosel column 3, the grooved ring 8 is held by the shaft case 5, but a jig having the same tip as the shaft case 5 may be used. Good. This jig has a length longer than that of the shaft case 5 and preferably has a mark similar to the mark N.

DESCRIPTION OF SYMBOLS 1 Head 1a Face part 1e Heel part 3 Hosel column 4 Shaft 5, 5A, 5 ', 5'',5''' Shaft case 5a, 5a ', 5a'',5a''' Convex shaft part 5h Shaft insertion hole 5m Female thread hole 6 Partition plate portion 6a Bolt insertion hole 7 Bolt 8, 8 'Grooved ring 8i Groove 8g Groove lower end 10 Head body 11 Hole 31 Spacer

Claims (7)

A golf club having a head attached to the tip of a shaft,
A substantially cylindrical shaft case is fixed to the tip of the shaft,
In the golf club in which the shaft case is inserted into the hosel column of the head and the shaft case is fixed to the hosel column.
A partition plate is provided in the hosel column,
A grooved ring provided with a plurality of grooves extending in the axial direction of the inner hole on the inner peripheral surface of the inner hole is installed on the upper side of the partition plate portion,
A convex shaft is provided at the tip of the shaft case,
The convex shaft portion has a prismatic shape, or a convex strip extending in the axial direction is provided on the outer peripheral surface,
The convex shaft portion is inserted into the inner hole of the grooved ring, and the corner edge or convex line of the convex shaft portion is engaged with the groove of the grooved ring,
A golf ball characterized in that a bolt inserted from a sole side of the head into a bolt insertion hole provided in the partition plate portion is screwed into the shaft case, whereby the shaft case is fixed to the hosel column. club.   2. The golf club according to claim 1, wherein a female screw hole is provided in a tip surface of the convex shaft portion, and the bolt is screwed into the female screw hole.   3. The golf club according to claim 1, wherein the axis of the shaft is inclined with respect to the axis of the cylindrical portion.   3. The golf club according to claim 1, wherein the shaft center of the shaft and the shaft center of the cylindrical portion are parallel to each other.   3. The golf club according to claim 1, wherein grooves having different depths from an upper end are provided in the grooved ring. A method for adjusting the characteristics of a golf club according to any one of claims 1 to 5,
After removing the bolt and separating the convex shaft portion of the shaft case from the grooved ring and rotating the shaft case, the convex shaft portion of the shaft case is again engaged with the grooved ring, and the bolt is A method for adjusting characteristics of a golf club, comprising fixing the golf club. A method for adjusting characteristics by replacing the shaft of the golf club according to any one of claims 1 to 5 with a new shaft,
A new shaft is fixed to a new shaft case in advance to create a new shaft case / shaft assembly,
A method for adjusting characteristics of a golf club, comprising: removing a shaft case / shaft coupling body attached to the golf club from the head; and attaching a new shaft case / shaft coupling body to the head.

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