JP5447141B2 - Golf club - Google Patents

Description

  The present invention relates to a golf club, and more particularly to a golf club that can easily exchange a shaft and can change the behavior of a head during a swing by changing the ease of bending of the tip of the shaft.

  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.

  Japanese Patent Laid-Open No. 2009-254449 discloses 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 is inserted into the hosel from the upper end side of the hosel of the head. A golf club is described in which a case is inserted and the shaft case is fixed to the hosel by an annular screw member removably screwed to the upper end side of the hosel.

  According to this golf club, the shaft case can be extracted from the hosel hole when the screw member is loosened and removed. The shaft can be easily exchanged by inserting a new shaft case / shaft coupling body in which the shaft case is previously attached to the shaft into the hosel hole and screwing the screw member.

  Japanese Utility Model Registration No. 312867 discloses that the center of gravity of the entire head is relatively lowered by connecting a light hosel to the head body.

JP 2009-254449 A Utility Model Registration No. 3124867

  Patent Documents 1 and 2 do not describe changing the behavior of the head during a swing by changing the ease of bending of the tip of the shaft without exchanging the shaft.

  In the golf club in which the shaft case is detachable from the hosel as described above, the behavior of the head during the swing can be changed by changing the ease of bending of the tip of the shaft without changing the shaft. An object of the present invention is to provide a golf club that can be changed.

  The golf club according to claim 1 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 inside of the hosel from the upper end side of the hosel hole of the head. In a golf club in which the shaft case is inserted into the shaft and the shaft case is fixed by an externally fitted annular screw member, the lower end side is screwed to the upper end side of the hosel hole, and the screw member is screwed. And a pair of half-cylindrical attachments that are externally fitted to the shaft and are interposed between the upper end surface of the shaft case and the lower end surface of the screw member. Is a golf club in which the shaft case is fixed to the hosel hole by pressing the shaft through the attachment, and the extension member and the attachment Remove the door, in which the shaft case by screwing the 該螺Ko member at the upper end of the hosel hole is characterized in that it is secured to the hosel bore.

  A golf club according to a second aspect is the golf club according to the first aspect, wherein a female screw is formed on the inner peripheral surface on the upper end side of the hosel hole, and a male screw is provided on the outer peripheral surface on the lower end side of the extension member, A female screw is provided on the inner peripheral surface on the upper end side, a male screw is provided on the outer peripheral surface of the screw member, and the male screw of the screw member is screwed to the female screw of the extension member to extend the extension member. The male screw is screwed into the female screw in the hosel hole so that the screw member is screwed to the extension member, the extension member is screwed to the hosel, and the lower end surface of the screw member is A golf club in which the shaft case is fixed by contacting the upper end surface of the attachment, and the lower end surface of the attachment contacts the upper end surface of the shaft case, wherein the extension member and the attachment are omitted, and the screw At the top end of the hosel hole It is deposited, in which the shaft case also by abutting the lower end surface of the 該螺Ko member to the upper end surface of the shaft case is characterized in that it is secured to the hosel bore.

  A golf club according to a third aspect of the present invention is the golf club according to the second aspect, wherein the shaft case is formed of a cylindrical body sealed at the lower end side and opened at the upper end side, and the shaft is inserted into the shaft case and fixed by an adhesive. It is characterized by this.

  A golf club according to a fourth aspect of the present invention is the golf club according to the third aspect, wherein at least the lower end side of the shaft case is a non-circular cross-sectional shape portion, and the front end side of the shaft case is engaged with at least the lower end side of the hosel. A shape portion is provided.

  A golf club according to a fifth aspect is the golf club according to the fourth aspect, wherein the non-circular cross-sectional shape portion of the shaft case is an inclined surface oblique to the central axis of the shaft case, and the non-circular cross-sectional shape portion of the hosel is It consists of the slope which crosses with respect to the central axis of a hosel.

  The golf club of claim 6 is characterized in that, in any one of claims 1 to 5, an elastic body is interposed between the lower end side of the shaft case and the inner surface of the hosel hole. .

  According to a seventh aspect of the present invention, in the golf club according to any one of the first to sixth aspects, an elastic body is interposed between the screw member and the extension member.

  A golf club according to an eighth aspect of the present invention is the golf club according to any one of the first to seventh aspects, wherein a weight material for weight adjustment is detachably provided on the head.

  In the present invention, the shaft case is inserted into the hosel hole through the extension member, and the shaft case is fixed by the screw member through the attachment. Therefore, when the screw member is loosened and removed, the shaft case is extracted from the hosel hole. be able to. The shaft can be exchanged by inserting a new shaft case / shaft coupling body in which the shaft case is previously attached to the shaft into the hosel hole and screwing the screw member.

  In the golf club of the present invention, by providing the extension member in the hosel part, the length of the hosel part becomes long and the bending of the shaft tip part is suppressed. Thereby, generally, the launch angle of the ball is lowered, but the direction and the flight distance of the ball are easily stabilized.

  In the golf club of the present invention, the shaft case can be fixed also by omitting the extension member and the attachment and screwing the screw member directly into the hosel hole. In this way, when the extension member and attachment are omitted or replaced with a short extension member and attachment, the launch angle of the ball becomes high. Therefore, a favorite hitting ball (bulb) can be obtained by replacing or removing the extension member.

  The weight of the head can be adjusted by attaching and removing the extension member and the attachment. This weight adjustment is also possible by changing the material (specific gravity) of the extension member and attachment.

  According to the present invention, it is possible to save the troublesome labor and time of breaking the adhesive structure by heating, removing the shaft, and reattaching the new shaft with the adhesive. For this reason, it is possible to remove the shaft from the head of the golf club that has just been hit and attach another shaft with different characteristics to the head and immediately make a test hit. Therefore, it is extremely difficult for a golfer to find an appropriate golf club at a golf shop or the like. It becomes easy.

  In the golf club according to the third aspect, the shaft can be inserted into the shaft case to be firmly bonded.

  According to the golf club of the fourth aspect, the circumferential positioning of the shaft case is performed. Further, rotation between the head and the shaft case is prevented. If the shaft case and the hosel are provided with a non-circular cross-sectional shape in this way, if the grip has a ridge, the ridge can be accurately positioned on the surface facing the ground in the address state. .

  According to the golf club of claim 5, it is easy to insert the shaft case into the hosel.

  According to the golf club of the sixth aspect, the impact and vibration between the shaft case and the inner surface of the hosel are absorbed.

  According to the golf club of the seventh aspect, rattling between the screw member and the shaft is prevented.

  According to the golf club of the eighth aspect, an increase in the weight of the head due to the attachment of the extension member and the attachment can be offset or reduced by reducing the weight of the weight material.

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 perspective view which shows the attachment and replacement | exchange method of a shaft. It is a perspective view which shows the attachment and replacement | exchange method of a shaft. It is a perspective view which shows the attachment and replacement | exchange method of a shaft. It is a perspective view of a hosel, a shaft case, and a screw member. It is sectional drawing of a hosel, a shaft case, and a screw member. It is a cross-sectional perspective view of a hosel. It is a bottom view of a head. It is the XI-XI sectional view taken on the line of FIG. It is the XII-XII sectional view taken on the line of FIG. It is a bottom view of the head concerning another embodiment. It is a perspective view which shows another embodiment. It is a perspective view which shows another embodiment. It is a perspective view which shows another embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a front view of a golf club head according to an embodiment, and FIG. 2 is a side view of the heel side of the golf club head. 3 is a cross-sectional view taken along the line III-III of FIG. 2, FIGS. 4, 5 and 6 are perspective views showing how to attach and replace the shaft, and FIG. 7 is a view of the hosel, shaft case and screw member. FIG. 8 is a sectional view of a hosel, a shaft case and a screw member, and FIG. 9 is a sectional perspective view of the hosel. 1 (a) to 8 (a) show a configuration in which a screw member is screwed directly into a hosel hole, and (b) the ratio is that an extension member is screwed into the hosel hole, and the screw is attached to the extension member. The structure which screwed the member is shown.

  In this golf club, a shaft 4 is attached to a hosel hole 3 of a head 1 via a shaft case 5, an extension member 10, an attachment 11, and a screw member 6.

  The head 1 has a head body 2 and a hosel hole 3 attached to the head body 2. The head 1 is of a hollow wood type and includes a face portion 2a, a crown portion 2b, a sole portion 2c, a toe portion 2d, a heel portion 2e, and a back portion 2f. As shown in FIGS. 10 to 12, a weight member 17 is detachably screwed from the bottom surface side to an anchoring portion (female screw portion) 18 provided in the sole portion 2c. In this embodiment, the rib 20 is provided on the inner surface of the sole portion 2c. The rib may extend in the toe-heel direction as shown in FIG. 10, or may extend in the front-rear direction like the head 1A in FIG. 13 (a). The heads 1B and 1C of c) may extend in two directions in a cross or X shape.

  As shown in FIG. 3, a cylindrical hosel installation portion 2g is provided on the face portion 2a side and the heel portion 2e side of the crown portion 2b. The hosel installation portion 2g has a cylindrical shape with an upper end opened and a lower end closed, and extends coaxially with the shaft 4. A hosel hole 3 is inserted into the hosel installation portion 2g from above and fixed by appropriate fixing means such as welding, brazing, adhesion, shrink fitting, and cold fitting. The hosel hole 3 may be formed integrally with the head body 2 by casting or the like.

  As shown in FIGS. 7 to 9, the hosel hole 3 has a substantially cylindrical shape in which holes are pierced in the axial direction from the upper end to the lower end.

  A female screw 3 a is provided on the inner peripheral surface of the hosel hole 3 on the inlet side, that is, the upper end side of the hosel hole 3. Subsequent to the female screw 3a, a step surface 3b is provided in the direction of diameter reduction, and the back side of the step surface 3b is a cylindrical portion 3c. A pair of inclined surfaces 3d and 3d that obliquely intersect the axis of the hosel hole 3 are provided on the back side of the cylindrical portion 3c. The inclined surfaces 3d and 3d are arranged symmetrically with the axis of the hosel hole 3 in between. The distance between the inclined surfaces 3d and 3d, that is, the distance in the direction orthogonal to the hosel axis is smaller toward the lower end of the hosel. The crossing angle θ (FIG. 8) between the inclined surfaces 3d and 3d is preferably about 10 to 30 °, particularly about 15 to 20 °.

  As shown in FIGS. 8 and 9, the shaft case 5 is a cylindrical member having a slightly smaller diameter than the cylindrical portion 3c of the hosel hole 3, and is a hole for inserting the shaft 4 from the upper end side toward the lower end side. 5a is provided. The length of the cylindrical portion of the hole 5a is preferably 10 mm or more, for example, 10 to 50 mm, particularly about 20 to 40 mm. A small hole 5b for venting air is formed in the lower end surface of the shaft case 5 from the bottom surface of the hole 5a. In addition, it is preferable that the cylindrical portion of the hole 5a of the shaft case extends (deeper) to a position where the inclined surface 3d is formed. Since it receives an impact at the time of hitting on the slope, the hit feeling is close to that of a club in which the head and the shaft are fixed with a general adhesive.

  A pair of inclined surfaces 5 c and 5 c are provided on the outer surface on the lower end side of the shaft case 5. The inclined surfaces 5 c and 5 c are provided symmetrically with respect to the shaft center line of the shaft case 5. The distance between the inclined surfaces 5c, 5c, that is, the interval in the direction perpendicular to the axis of the shaft case 5 is smaller toward the lower end side of the shaft case. The intersection angle between the inclined surfaces 5c and 5c is the same as the intersection angle θ between the inclined surfaces 3d and 3d of the hosel hole 3. The size of the inclined surface 5c of the shaft case 5 may be the same as that of the inclined surface 3d of the hosel hole 3, or may be slightly smaller when an elastic body is interposed.

  In addition, although illustration is abbreviate | omitted, the shaft 4 may be made easy to insert by forming a chamfer of about 20 to 45 degrees on the inner peripheral edge on the upper end side of the shaft case 5. Further, the outer diameter of the upper end side of the shaft case 5 may be increased and the upper end side may be formed into a flange shape. In this way, as will be described later, the pressing area when the upper end surface of the shaft case is pressed by the lower end surface of the screw member 6 is increased.

  The extension member 10 has a substantially annular shape, and the lower half portion has a smaller diameter than the upper half portion, and a male screw 10b that is screwed to the female screw 3a is engraved on the outer peripheral surface of the lower half portion. ing. A female screw 10 a is engraved on the inner peripheral surface of the upper portion of the extension member 10. The inner diameter of the hole 10 c of the extension member 10 is the same as the inner diameter of the cylindrical portion 3 c of the hosel hole 3. You may provide the recessed part and plane part for tool engagement in the outer peripheral surface of the upper half part of the extension member 10. FIG.

  The attachments 11 and 11 have a halved cylindrical shape, and when the pair of attachments 11 and 11 are combined, a cylindrical shape is obtained. The inner diameter of this cylinder is substantially equal to the inner diameter of the hole 5 a of the shaft case 5. Further, the outer diameter of this cylinder is equal to the outer diameter of the shaft case 5. The length of the attachments 11, 11 in the cylindrical axis direction is equal to the length of the upper half of the extension member 10 in the axis direction. The length in the axial direction is preferably about 5 to 40 mm, particularly about 12 to 26 mm (about 0.5 to 1 inch). A plurality of sets of extension members and attachments having different lengths in the axial direction may be prepared.

  The screw member 6 has a substantially annular shape, and the lower half portion has a smaller diameter than the upper half portion 6a, and a male screw 6b is engraved on the outer peripheral surface of the lower half portion. The upper end side of the upper half 6a is tapered (a truncated cone). The lower half of the screw member 6 has a diameter that allows the male screw 6 b to be screwed into the extension member 10 and the female screws 10 a and 3 a of the hosel hole 3. The screw member 6 has a shaft insertion hole 6c that penetrates in the axial direction. You may provide the recessed part and flat part for engaging a tool with the outer peripheral surface of the upper half part 6a of the screw member 6. FIG.

  The diameter of the hole 6c is slightly larger than the diameter of the shaft 4. An O-ring 6r made of rubber, elastomer or the like is attached to the inner peripheral surface of the hole 6c, the circumference of the O-ring 6r is brought into contact with the shaft 4, and the slidability between the shaft 4 and the inner peripheral surface of the hole 6c. Or to prevent the shaft 4 from rattling. Further, thin spacers 6f and 6g made of an elastic material such as rubber or elastomer are provided between the screw member 6 and the extension member 10 or the hosel hole 3, and between the screw member 6 and the attachment 11, 11 or the end surface of the shaft case 5. Is interposed.

  To assemble the golf club, as shown in FIG. 4 (a) or (b), the screw member 6 is fitted from the tip side of the shaft 4, and the shaft case 5 is fixed to the tip of the shaft 4 with an adhesive. Keep it. 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 part of the hole 5 a of the shaft case 5.

  Since the small hole 5b is provided in the shaft case 5, when the shaft 4 is inserted into the hole 5a of the shaft case 5, air flows out through the small hole 5b. As the adhesive, an epoxy adhesive or the like is suitable.

  When assembling a golf club having a long hosel, the male screw 10b of the extension member 10 is screwed into the female screw 3a of the hosel hole 3 as shown in FIG. Then, the attachments 11 are mounted on the shaft case 5 on the shaft 4 of the shaft case / shaft assembly to which the screw member 6 is inserted and the shaft case 5 is fixed as described above. Then, the shaft case 5 is inserted into the hosel hole 3 from the extension member 10. In this embodiment, a thin elastic material 7 such as rubber (e.g., about 0.5 to 5 mm) rubber or elastomer is applied to the inclined surfaces 5c and 5c of the shaft case 5 and the tip end surface of the shaft case. It is provided by pasting. The elastic body 7 may be provided in the shaft case 5 in advance, or may be provided in the shaft case 5 after constituting the shaft case / shaft coupling body.

  As shown in FIG. 5 (b), the shaft case 5 is inserted into the hosel hole 3, and the slopes 5c, 5c and the slopes 3d, 3d are overlapped. Next, as shown in FIG. 6 (b), the male screw 6 b of the screw member 6 is screwed into the female screw 10 a of the extension member 10.

  Thereby, as shown in FIG. 3B, the lower end surface of the screw member 6 contacts the upper end surface of the attachment 11, the lower end surface of the attachment 11 contacts the upper end surface of the shaft case 5, and the inclined surface 5c of the shaft case 5 Is pressed against the inclined surface 3 d of the hosel hole 3 through the elastic body 7, and the shaft case 5 is fixed to the hosel hole 3. Since the shaft case 5 and the shaft 4 are firmly bonded by an adhesive, a golf club having a long hosel in which the shaft 4 and the head 1 are integrated is completed. In this golf club, the hosel is long because the shaft case 5 with the shaft 4 is inserted into the hosel hole 3 with the extension member 10 and fixed with the screw member 6. Therefore, the bending of the tip end portion of the shaft 4 is suppressed, and variation in the hitting direction is suppressed. In addition, in a golfer with a high head speed, the backspin of the ball can be suppressed, the blow-up can be suppressed, and a ball muscle close to an ideal trajectory can be obtained.

  When assembling a golf club having a short hosel portion, the extension member 10 is removed from the female screw 10a of the hosel hole 3 and the attachments 11 and 11 are removed from the shaft 4 as shown in FIG. In this state, the shaft case 5 is inserted into the hosel hole 3 as shown in FIG. 5 (a), and the inclined surfaces 5c, 5c and the inclined surfaces 3d, 3d are overlapped with each other, as shown in FIG. 6 (a). The male screw 6 b of the member 6 is screwed into the female screw 3 a of the hosel hole 3. As a result, as shown in FIGS. 7 (a) and 8 (a), the lower end surface of the screw member 6 comes into direct contact with the upper end surface of the shaft 5, the shaft case 5 is fixed to the hosel hole 3, and the hosel portion A short golf club is completed. As shown in FIG. 6 (a), in the golf club having a short hosel portion, the bending of the tip end portion of the shaft 4 is increased, the head speed is improved, the ball launch angle is increased, and the flight distance is increased. Can be expected.

  In this way, by changing the ease of bending of the tip of the shaft, the behavior of the head during the swing can be changed, and a preferable ball muscle or the like can be adjusted for each golfer. Note that the weight of the head can be adjusted by attaching or omitting the extension member 10 and the attachments 11 and 11.

  By using the extension member 10 and the attachments 11 and 11 having different specific gravities, the head weight can be finely adjusted.

  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 screw member 6 is also attached to this shaft.

  The screw member 6 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 and the screw member 6. Next, a new shaft (shaft case / shaft coupling body) with a shaft case and a screw member is inserted into the head 1 and fixed by the screw member 6. When the hosel portion is shortened, the extension member 10 and the attachment 11 are omitted as shown in FIGS. 1A to 8A, and when the hosel portion is lengthened, each of FIGS. b) Mount the extension member 10 and the attachment 11 as shown.

  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 utilization method in which shafts of various specifications with a shaft case are prepared, and different shafts are sequentially attached to the same head body for trial hitting.

  In this embodiment, by providing the inclined surfaces 3d and 5c, the inner surface on the deep side of the hosel hole 3 and the outer surface on the lower end side of the shaft case 5 are each non-circular cross-sectional shapes (perpendicular to the axial center line). Since the slopes 3d and 5c are engaged with each other, there is little backlash and rotation of the shaft 4 around the shaft axis is prevented. That is, the fixed rigidity in the torque direction of the shaft 4 is high.

  Further, since the pair of inclined surfaces 5 c and 5 c are provided and the tip end side of the shaft case 5 is tapered, the shaft case 5 can be easily inserted into the hosel hole 3.

  In the above embodiment, the male member 6b is provided in the screw member 6 and the female screw 3a is provided in the hosel hole 3. However, the upper end of the hosel is protruded from the head main body 2, and the male screw is provided on the outer periphery of the upper end of the hosel. Also good. In this case, the extension member and the screw member have a cap shape, and a female screw that is screwed into the male screw is provided.

  The hosel, shaft case, extension member, attachment, and screw member are preferably made of metal, and particularly preferably made of aluminum, titanium, or an alloy thereof. The hosel hole 3 separate from the head 1 is preferably made of a material having a specific gravity equal to or lower than that of the head body. For example, titanium alloy, aluminum, aluminum alloy, magnesium alloy, FRP, synthetic resin, etc. may be used. .

  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.

  In the above embodiment, a pair of slopes 5c, 5c, 3d, 3d is provided, but the number of slopes may be 1 or 3 or more. However, it is preferable to use one pair at a time as shown.

  In the present invention, the spacer 6g between the screw member and the extension member 10 or the hosel hole 3 may be omitted, and an O-ring may be provided so as to surround the shaft 4 instead. For example, a concave step portion is provided around the inner peripheral surface of the lower end of the screw member, and an O-ring is provided in the concave step portion.

  In the present invention, the swing balance of the golf club changes from using the extension member 10 and the attachment 11 in order to change the length of the hosel. Therefore, it is preferable to prepare a plurality of weight materials 17 having different weights so as to adjust the swing balance and replace the weight materials as necessary. Specifically, the weight material 17 is a screw-shaped weight screw, such as plastic screw such as nylon, Mg alloy screw, Al alloy screw, stainless steel screw, plated steel screw, copper alloy screw, tungsten alloy. Those made of materials having different specific gravity such as screws are preferred. As shown in FIGS. 10 and 13, the position of the mooring portion 18 is preferably near the center of the sole and directly below the center of gravity of the head body. This is because the position of the center of gravity of the head does not change much.

  In the present invention, as shown in FIGS. 14 to 16, it is possible to provide an engagement means between the half-cylinder attachments 11, 11 for easy handling.

  14 (a) and 14 (b), a pin 11a is provided on the end surface of one attachment 11 in the cylinder axis direction, and a recessed hole 11b is provided on the end surface of the other attachment 11 in the cylinder axis direction. The attachments 11 and 11 are engaged with each other so as to insert the pin 11a into the recessed hole 11b to form a cylindrical shape.

  15A and 15B, a claw portion 11c is provided on the end surface of one attachment 11 in the cylinder axis direction, and a locking groove portion 11d is provided on the end surface of the other attachment 11 in the cylinder axis direction. The attachments 11 and 11 are engaged with each other so as to lock the claw portion 11c with the locking groove portion 11d to form a cylindrical shape.

  In FIGS. 16 (a) and 16 (b), on one of the two end faces of the attachment 11 in the cylinder axis direction, a convex strip 11f is provided on the outer peripheral side, and a concave strip 11e is provided on the inner peripheral side. Provided. On the other end face, the concave line 11e is provided on the outer peripheral side, and the concave line 11e is provided on the inner peripheral side. Both the protrusion 11f and the recess 11e extend from one end to the other end of the attachment 11 in the cylinder axis direction. The protrusion 11f of one attachment 11 is engaged with the recess 11e of the other attachment 11, and the attachments 11 and 11 are engaged to form a cylinder.

DESCRIPTION OF SYMBOLS 1 Head 2 Head main body 2a Face part 2e Heel part 2t Thick part 3 Hosel hole 3a Female screw hole 3d Slope 4 Shaft 5, 5A Shaft case 5c Slope 6 Screw member 10 Extension member 11 Attachment

Claims (8)

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 from the upper end side of the hosel hole of the head, and the shaft is fixed by an externally fitted annular screw member.
An extension member in which the lower end side is screwed to the upper end side of the hosel hole and the screw member is screwed;
And a pair of half-cylindrical attachments that are fitted on the shaft and interposed between the upper end surface of the shaft case and the lower end surface of the screw member, and the screw member is interposed via the attachment. A golf club in which the shaft case is fixed to the hosel hole by pressing a shaft,
A golf club, wherein the shaft case can be fixed to the hosel hole by removing the extension member and attachment and screwing the screw member to the upper end side of the hosel hole. In Claim 1, a female screw is engraved on the inner peripheral surface of the upper end side of the hosel hole,
A male screw is provided on the outer peripheral surface on the lower end side of the extension member, and a female screw is provided on the inner peripheral surface on the upper end side,
A male screw is provided on the outer peripheral surface of the screw member,
The male screw of the screw member is screwed to the female screw of the extension member, and the male screw of the extension member is screwed to the female screw of the hosel hole, whereby the screw member is screwed to the extension member, An extension member is screwed to the hosel;
A golf club in which the lower end surface of the screw member is in contact with the upper end surface of the attachment, and the shaft case is fixed by the lower end surface of the attachment being in contact with the upper end surface of the shaft case,
The extension member and attachment are omitted, the screw member is screwed onto the upper end side of the hosel hole, and the lower end surface of the screw member is brought into contact with the upper end surface of the shaft case, so that the shaft case becomes the hosel hole. A golf club characterized by being fixable. In claim 2, the shaft case is formed of a cylindrical body whose lower end side is sealed and whose upper end side is open,
A golf club, wherein the shaft is inserted into the shaft case and fixed by an adhesive. In claim 3, at least the lower end side of the shaft case is a non-circular cross-sectional shape part,
A golf club characterized in that a non-circular cross-sectional shape portion engaged with the tip end side of the shaft case is provided at least on the lower end side of the hosel. In claim 4, the non-circular cross-sectional shape portion of the shaft case comprises a slope that is oblique to the central axis of the shaft case,
The golf club according to claim 1, wherein the non-circular cross-sectional shape portion of the hosel comprises a slope that is oblique to the central axis of the hosel.   6. The golf club according to claim 1, wherein an elastic body is interposed between a lower end side of the shaft case and an inner surface of the hosel hole.   7. The golf club according to claim 1, wherein an elastic body is interposed between the screw member and the extension member.   The golf club according to claim 1, wherein a weight material for weight adjustment is detachably provided on the head.

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