JP2005270402A - Golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club which can improve the balance of the club head along with easier loading or unloading between the club head and the shaft while securely preventing the club head from slipping off in the midst of the swinging thereof. <P>SOLUTION: The golf club has a shaft insertion hole 44 having a non-circular part 44a with a non-circular sectional surface which is formed in a hosel part 30 where the shaft 12 is locked on the body 18 of the head piercing the body of the head from the side of the crown part 26 to the side of the sole part 32, a spacer member 48 which is secured at the tip part of the shaft 12 and has a non-circular fitting part 48a fitted into the non-circular part formed in the outer circumference part, a protrusion 46 which is formed by protruding from the inner circumference part of a shaft insertion hole 44 and engaged with the end part on the side of the crown part of the spacer member 48 to prevent the shaft 12 from slipping off on the side of the crown part and an anti-slip means 52 which prevents the tip of the shaft 12 from slipping off on the side of the sole part 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a golf club, and more particularly to a golf club in which a shaft is fixed to a shaft insertion hole of a hosel portion via a spacer member.

  A female screw formed at the bottom of the hosel joint by drilling a hole with a concave taper surface in the hosel part of the golf club head and bonding a hosel joint with a convex taper surface that fits into the concave taper surface to the tip of the shaft In addition, a golf club is known in which a bolt is screwed through a through-hole formed in a bottom portion of a hosel portion, and a hosel joint and a shaft are pulled into a tapered hole of the bosel portion to fix the club head and the shaft. (For example, see Patent Document 1). In this golf club, by setting the club shaft and the hosel joint on non-identical axes, the hosel joint can be rotated around the axis to adjust the loft angle and the lie angle.

  Also, a non-circular locking piece is fixed to the tip of a hollow cylindrical shaft formed in a tapered shape, and the bottom wall formed with a through hole is fitted to the non-circular shape of the locking piece. A golf club in which a bottomed cylindrical engagement member having a hole is fitted into a through hole provided in a neck portion of a club head and a bolt is screwed into a screw hole of a locking piece from a bottom opening of the club head and fixed. It is known (see, for example, Patent Document 2). In this golf club, by rotating the engaging member, the engaging relationship between the shaft and the club head can be changed, and one golf club can be used with various changes.

Further, a wood golf club head having a shaft fitting hole for forming a predetermined lie angle and loft angle, and attaching the shaft to the head body of the club head via a spacer member having a substantially conical shape and an elliptical bottom portion. It is known (see, for example, Patent Document 3). In this golf club head, a spacer member having a predetermined lie angle and loft angle is fitted into a spacer fitting hole formed in a substantially conical shape in the head main body, and various fittings are carried out by using an adhesive. A club head having a lie angle and a loft angle can be formed.
JP 2000-5349 A JP 2000-237355 A JP-A-4-12778

However, as described in Patent Document 1 and Patent Document 2, in a golf club in which the tip of the shaft is fixed to the club head with a bolt, the shaft can be easily rotated by attaching and detaching the bolt. Even if the relationship between the shaft and the club head, that is, the adjustment of the loft angle and the lie angle is simple, it cannot withstand a large load acting during a swing. In other words, a large force acts on the golf club head in the direction of coming off from the tip of the shaft due to the club head weight at the time of swing. This force acts on the threaded portion via the bolt, and if the threaded portion is damaged, the club head may come off the shaft and jump out. Such bolts are screwed along the axial direction of the shaft, and the number of bolts cannot be increased. On the other hand, when the strength of the threaded portion is increased, the material cost increases or the connecting portion is enlarged, which adversely affects the balance of the weight and shape of the club head.
Further, as described in Patent Document 1, since the hosel joint and the hosel portion of the club head are fixed with the tapered surfaces meshing with each other, the club head may rotate with respect to the shaft during a swing. is there.

  Further, as described in Patent Document 3, in the golf club in which the shaft is fixed to the club head via the substantially conical spacer member, the spacer member is easily replaced because it is fixed to the club head by the adhesive. Therefore, adjustment of the lie angle and loft angle is troublesome.

  The present invention has been made based on the above-described circumstances, and can surely prevent the club head from coming off during a swing, and the club head and the shaft can be easily attached and detached, thereby balancing the club head. An object is to provide a golf club that can be improved.

  The golf club of the present invention that achieves the above object is formed by passing the head body from the crown portion side to the sole portion side in a hosel portion that fixes the shaft to the head body, and has a non-circular cross-sectional shape. A shaft insertion hole having at least a part thereof, a spacer member fixed to a tip end portion of the shaft and having a non-circular fitting portion fitted to the non-circular portion on an outer peripheral portion, and the shaft insertion hole A locking part that protrudes from the inner peripheral part, engages with the crown part side end of the spacer member and prevents the shaft from being pulled out from the crown part side, and is attached to or detached from one of the head body and the shaft. It is attached freely and is provided with a retaining means for preventing the tip of the shaft from being pulled out from the sole side.

  According to the golf club of the present invention, the non-circular portion formed in the shaft insertion hole of the hosel portion and the fitting portion of the spacer member fixed to the shaft are fitted, thereby preventing the club head from rotating with respect to the shaft. In addition, the engaging portion protruding from the inner peripheral portion of the shaft insertion hole is engaged with the crown portion side end portion of the spacer member, thereby preventing the club head from coming off during the swing. By removing the retaining means from the head main body or the shaft, the spacer member fixed to the shaft can be extracted from the shaft insertion hole to the sole portion side. Since a large partial force does not act on the retaining means, it is not necessary to increase the size.

  Therefore, according to the golf club of the present invention, it is possible to reliably prevent the club head from coming off during the swing, and it is easy to attach and detach the club head and the shaft, thereby improving the balance of the club head.

1-4 illustrate a golf club 10 according to a preferred embodiment of the present invention.
The golf club 10 of the present embodiment includes a tubular body that is a laminated member formed by winding a plurality of prepreg sheets in which a reinforcing fiber is impregnated with a synthetic resin, or a shaft 12 that is formed of a metallic tubular body. A club head 14 is attached to the tip of the shaft 12 and is formed as a wood club having a grip (not shown) made of a soft or soft material such as natural rubber or synthetic rubber attached to the base end. The shaft 12 may be formed by combining a plurality of members instead of forming the entire shaft 12 with a laminated member or one metal member.

  As shown in FIGS. 1A and 1B, the club head 14 includes a head body 18 formed into a hollow integrated structure by casting or forging from a metal material such as titanium, a titanium alloy, or a stainless alloy. . The head body 18 has a shaft 12 in a state where a back portion 22 protrudes rearward from a face portion 20 for hitting a ball and is inclined rearward from a crown portion 26 on the heel portion 24 side to the side opposite to the toe portion 28. A hosel portion 30 is provided. Further, in addition to the score line, the face 20 is minute so that even if a slight dent or the like is formed due to a collision with a hard foreign object such as a stone, such a dent is not conspicuous. Rough surface processing in which a large number of straight grooves or ridges are formed at minute intervals may be applied. Reference numeral 32 denotes a sole portion. Instead of forming the head main body 18 in such an integral structure, for example, each face is formed by separate members such as providing a face member as a separate member on the face portion 20, and these members are joined to each other. May be formed. When such a plurality of members are joined and formed, a fiber reinforced resin material can be used for at least a part of the head body 18.

  The head body 18 has a large opening 34 formed in the crown portion 26, and a mounting portion 36 that supports a peripheral portion of a plate member 40 made of, for example, fiber reinforced resin, is integrated with the entire periphery of the opening 34. Is formed. The mounting portion 36 forms a step substantially equal to the thickness of the plate member 40 between the face portion 20 and the hosel portion 30 and an edge portion 38 forming a part of the crown portion 26. When 40 is mounted, a smooth continuous surface is formed without forming a step between the plate member 40 and the edge 38.

  Further, the mounting portion 36 is formed from a peripheral wall portion extending between the crown portion 26 and the sole portion 30 on the heel portion 24 side and the back portion 22 side of the head body 18 except for a portion adjacent to the edge portion 38. Therefore, no step is formed between the peripheral wall portions. The mounting portion 36 can maintain sufficient rigidity of the head main body 18 even when the crown portion 26 is greatly opened.

The edge portion 38 disposed between the mounting portion 36 and the face portion 20 is formed to have substantially the same width along the upper edge portion of the face portion 20 from the vicinity of the hosel portion 30 to the toe portion 28 side. Thus, the face portion 20 is securely supported when hitting. On the other hand, if the face portion 20 is supported at the time of hitting and the force received from the ball can be transmitted from the head body 18 to the shaft 12, the edge portion 38 is formed in a narrow band shape as shown in the figure. Instead, it can be formed in an appropriate width and shape. For example, such an edge 38 may be formed over the entire circumference of the opening 34. And the plate member 40 which forms the outer shell of the crown part 26 with the edge part 38 is supported by the mounting part 36, adhere | attached on the mounting part 36 with an adhesive agent, for example, and closes the opening part 34. FIG.
Such a plate member 40 is formed in a laminated structure with a fiber reinforced resin having a specific strength larger than that of the metal material of the head main body 18 to reduce the weight of the crown portion 26 and lower the center of gravity of the club head 14. Yes.

  A hosel portion 30 for fixing the shaft 12 to the club head 14 is provided inside the club head 14 and includes a fixing cylinder portion 42 formed integrally with the head main body 18. A shaft insertion hole 44 that penetrates from the crown portion 26 side of the head body 18 to the sole portion 32 side and opens on the crown portion 26 side and the sole portion 32 side is formed in the fastening cylinder portion 42. The shaft insertion hole 44 is formed to have a larger diameter than the outer diameter of the shaft 12, and the distal end portion of the shaft 12 is inserted from the opening portion on the crown portion 26 side and protrudes from the opening portion on the sole portion 32 side. be able to.

  In order to prevent the club head 14 from being pulled out from the tip end portion of the shaft 12 during a swing, a protrusion 46 projects from the inner peripheral portion of the shaft insertion hole 44 in the vicinity of the upper end portion corresponding to the crown portion 26. The protrusion 46 forms a small-diameter hole portion 46a that is larger than the outer diameter of the shaft 12 and smaller than the outer diameter of the spacer member 48 fixed to the tip end portion of the shaft 12, so that the crown of the spacer member 48 is swung. It functions as a locking portion that engages with the end portion of the portion 26 and prevents the club head 14 from being pulled out of the shaft 12. In the case of using the shaft 12 that is thin at the distal end side and gradually increases in diameter toward the proximal end side, the diameter of the small diameter portion 46a is such that the spacer member 48 on the shaft 12 can be separated from the sole portion 32 of the head body 18 downward. It is preferable to do. By separating the spacer member 48 from the head body 18, it is possible to prevent the heat from acting on the head body 18, particularly the resin plate member 40, when the spacer member 48 is heated as will be described later. In order to prevent the influence of heat on the head main body 18 and the plate member 40, the distance at which the spacer member 48 is detached from the head main body 18 can be set to about 10 to 250 mm, for example.

  The protrusion 44a forming the locking portion is not necessarily formed over the entire circumference of the shaft insertion hole 44 as long as the force acting on the club head 14 can be transmitted to the spacer member 48. Alternatively, it may be formed as at least one protrusion or tooth.

  In this embodiment, as shown in FIG. 2, a non-circular portion 44 a having a non-circular cross-sectional shape, for example, a regular octagon is formed in the inner peripheral portion of the shaft insertion hole 44. A fitting portion 48a having a non-circular cross-sectional shape, for example, a regular octagon, is formed on the outer peripheral portion. The non-circular portion 44a and the fitting portion 48a are preferably formed over the entire length of the shaft insertion hole 44 and the spacer member 48. May be. Further, the non-circular shape is not limited to a regular octagon, and may be formed into a polygonal shape such as a quadrangular, pentagonal, hexagonal or decagonal shape, an elliptical shape, etc. Other shapes or means such as grooves or spline shafts can also be used.

  The spacer member 48 can be formed of a stainless steel alloy, a titanium alloy, an aluminum alloy, a metal material containing silicon carbide particles or the like, or a synthetic resin such as a fiber reinforced resin. However, since the lighter one is preferable, a light metal such as an aluminum alloy is used. It is good to form with synthetic resins, such as fiber reinforced resin. For example, it is preferable to fix with a thermosetting adhesive such as an epoxy resin or an acrylic resin. The spacer member 48 is set to have a length and a position on the shaft 12 such that the end portion on the crown portion 26 side comes into contact with the protrusion 46 protruding to the inner peripheral side of the shaft insertion hole 44. On the other hand, in order to obtain the maximum coupling force between the shaft 12 and the spacer member 48, the end portion on the sole portion 32 side is preferably flush with the end surface of the tip portion of the shaft 12, but is not limited thereto. Instead, the spacer member 48 may have a bottomed structure, and lead or the like for weight adjustment (swing balance adjustment) may be placed in the bottom portion. Reference numeral 50 shown in FIG. 2 indicates an adhesive layer in which the spacer member 48 is fixed to the tip portion of the shaft 12. In addition, by using a thermosetting material as the adhesive, a strong integrated structure of the spacer member 48 and the shaft 12 can be obtained. Even after the spacer member 48 is fixed on the shaft 12, it can be easily removed by heating from above the spacer member 48 with a dryer or the like. In this case, the spacer member 48 can be protruded together with the shaft 12 from the opening on the sole portion 32 side of the shaft insertion hole 44 to the outside of the head main body 18, so that the head main body is not heated and the spacer member 48 is replaced. Is easy.

  On the lower end side of the shaft insertion hole 44, that is, on the sole portion 32 side, a retaining means 52 for preventing the shaft 12 and the spacer member 48 from being pulled out from the sole portion 32 side and holding it in the shaft insertion hole 44 is disposed. It is. The retaining means 52 of the present embodiment includes a plug main body 54 inserted into the shaft insertion hole 44, a screw member 56 that fixes the plug main body 54 to the head main body 18, and the plug main body 54 and the tip end portion of the shaft 12. And a biasing member 58 that biases the shaft 12 upward, that is, toward the crown portion 26 side. A screw member 56 is inserted from an open lower end portion of the plug body 54, and the screw member 56 is screwed into a screw hole 45 formed in the fastening cylinder portion 42 through a through hole 55 of the plug body 54. 54 is fixed in the shaft insertion hole 44.

  The urging member 58 can be formed of a spring washer 58A shown in FIG. 4A or an elastic body 58B formed in an annular structure with an elastic material such as rubber shown in FIGS. 4B and 4C. . The urging member 58 causes the spacer member 48 to abut against the protrusion 46 that is a locking portion, and prevents the shaft 12 from rattling within the shaft insertion hole 44.

  When attaching the club head 14 to the shaft 12, first, as shown in FIG. 3, the tip end portion of the shaft 12 is inserted into the shaft insertion hole 44 from the crown portion 26 side and protruded from the sole portion 32 side. A spacer member 48 is attached to the tip of the shaft 12 and fixed with an adhesive. A mark is previously placed on the shaft 12 at a position where the spacer member 48 is fixed, that is, at a position where the crown portion 26 side end of the spacer member 48 abuts the protrusion 46 when the spacer member 48 is disposed in the shaft insertion hole 44. This makes installation easy.

  After the adhesive is cured, the shaft 12 is drawn into the shaft insertion hole 44 together with the spacer member 48, and the crown side end of the spacer member 48 is brought into contact with the protrusion 46. Then, the urging member 58 of the retaining means 52 and the plug main body 54 are sequentially inserted into the shaft insertion hole 44 from the side of the sole portion 32, and the screw member 56 is passed through the through hole 55 of the plug main body 54. Screw into the screw hole 45. If necessary, the opening on the sole portion 32 side of the plug main body 54 may be closed with an appropriate member.

  On the contrary, when the club head 14 is separated from the shaft 12, the screw member 56 is removed, and the plug body 54 and the urging member 58 are removed from the shaft insertion hole 44. The shaft 12 is moved to the sole portion 32 side, and the spacer member 48 is detached from the shaft insertion hole 44. In this state, the spacer member 48 is heated to soften the adhesive layer 50, and the spacer member 48 is removed from the shaft 12. At this time, since the spacer member 48 is separated from the club head 14 by, for example, 10 to 250 mm as described above, the heat for heating the spacer member 48 does not adversely affect the plate member 40 of the club head 14. Absent. Thereafter, the shaft 12 is pulled out from the crown portion 26 side.

  In the golf club 10 of this embodiment, the club head 14 can be easily attached to and detached from the shaft 12, and the club head 14 attached to the shaft 12 projects the spacer member 48 by the biasing member 58. It is held in a state where it abuts against 46 and does not cause backlash. Normally, the golf club 10 is not subjected to a large force in the direction in which the tip end portion of the shaft 12 protrudes from the sole portion 32 side of the shaft insertion hole 44. Therefore, even with only one screw member 56, this club is not affected. The head 14 can be securely held on the shaft 12. On the other hand, a large force acting on the club head 14 during the swing acts in a direction in which the club head 14 is pulled out from the shaft 12, and acts on the shaft 12 via the protrusion 46 and the spacer member 48 engaged with the protrusion. Communicated. Since the protrusion 46 is formed integrally with the head body 18 and the spacer member 48 is firmly fixed to the shaft 12, the club head 14 is not pulled out from the shaft 12.

  Further, since the non-circular portion 44a formed in the shaft mounting hole 44 of the head body 18 and the fitting portion 48a formed on the outer peripheral portion of the spacer member 48 are engaged with each other, the shaft 12 is hit at the time of hitting. Even if a force for rotating the club head 14 is applied around the center, the rotation of the club head 14 relative to the shaft 12 is reliably prevented. The spacer member 48 that prevents the club head 14 from rotating and coming off is a sleeve-like structure that is fixed to the tip of the shaft 12 with an adhesive, so that the club head 14 and the shaft 12 can be easily attached and detached. Thus, the balance of the club head 14 can be improved.

  FIG. 5 shows a second embodiment. In this embodiment, the hosel portion 30 has a simpler structure, and further, the club head 14 is reduced in weight and the head balance is improved. Since various embodiments or modifications described below are basically the same as those in the above-described embodiment, the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the spacer member 48 is fixed on the shaft 12, and the protrusion 46 that locks the shaft 12 via the spacer member 48 is disposed at a position displaced from the crown portion 26 into the head body 18. There is a gap 47 between the inner surface of the shaft insertion hole 44 and the shaft 12 at a position closer to the crown portion 26 than the protrusion 46.

  Further, the retaining means 52 for preventing the distal end portion of the shaft 12 from being pulled out from the shaft insertion hole 44 toward the sole portion 32 is fixed to the plug body 54 </ b> A fixed to the lower end portion side of the shaft insertion hole 44 and the shaft 12. The socket 60 is formed. The plug main body 54A and the socket 60 are each formed of a synthetic resin and fixed with an adhesive or the like. Examples of the adhesive forming the adhesive layer 50A for fixing the plug main body 54A and the socket 60 to the fastening cylinder portion 42 and the shaft 12 include epoxy resin, acrylic resin, polyolefin, polybutene, polyester, and synthetic rubber. However, those that are easily softened by alcohol such as acrylic resin are preferred. This is to obtain a sufficient adhesive force and facilitate attachment / detachment.

  In the third embodiment shown in FIG. 6, the protrusion protruding from the inner peripheral surface of the shaft insertion hole 44 is omitted, and the spacer member 48 </ b> A is a cone whose outer diameter gradually decreases toward the crown portion 26 side. It is formed in a shape. The inner surface of the shaft insertion hole 44 is also preferably formed in a conical shape corresponding to the outer shape of the spacer member 48A. In the present embodiment, the same retaining means 52 as in the first embodiment is used, and the urging member 58 is omitted. In this case, it is preferable that the length of the shaft insertion hole 44 on the crown portion 26 side is large enough to allow the spacer member 48 </ b> A to be detached from the shaft insertion hole 44.

  The fourth embodiment shown in FIG. 7 is substantially the same as the first embodiment, but the fastening cylinder portion 42 is formed separately from the head body 18 and is formed of a lightweight material such as fiber reinforced resin. By doing so, the hosel part 30 and hence the club head 14 can be reduced in weight. In this case, the plug main body 54, the fastening tube portion 42A, and the head body 18 are integrally fixed by the screw member 56 of the retaining means 52, and relative rotation between the fastening tube portion 42A and the head body 18 is performed. Can be blocked. It is also possible to provide a fixing means for preventing the rotation of the fastening cylinder part 42A between the 19 projecting inward from the head body 18 and the fastening cylinder part 42A.

  FIG. 8 shows a fifth embodiment. In this embodiment, when the hosel part 30 is viewed in a cross section, the central axis of the shaft 12 is offset to one side with respect to the central axis of the shaft insertion hole 44. Placed in a state. Specifically, the spacer member 48 </ b> B has an uneven thickness sleep in which the center axis of the inner hole through which the shaft 12 is inserted is shifted to one side with respect to the center axis of the virtual cylindrical shape connecting the vertices of the regular polygon forming the outer shape. It is formed in a shape structure. It is preferable that the center axis of the virtual cylindrical shape and the center axis of the inner hole are parallel to each other at an interval of, for example, about 25 to 55 mm, or crossed or extended in a twisted relationship.

  In this embodiment, by shifting the other in the circumferential direction with reference to one corner or side of one regular polygon of the non-circular portion 44a of the shaft insertion hole 44 and the fitting portion 48a of the spacer member 48B. The position of the shaft 12 with respect to the head body 18 can be easily adjusted. Thereby, the mounting position of the shaft with respect to the club head 14 (specifically, the amount of inset, face progression, center of gravity distance, etc.) can be adjusted without changing the loft angle and the lie angle.

  FIG. 9 shows a sixth embodiment. In this embodiment, the central axis 13 of the shaft 12 is arranged at a point P on the crown portion 26 side with respect to the central axis 43 of the shaft insertion hole 44. Specifically, the spacer member 48C is formed such that the inner hole 49 through which the shaft 12 is inserted and the virtual cylindrical shape connecting the vertices of the regular polygon forming the outer shape intersect with the respective central axes. It is. That is, the central axis of the inner hole 49 of the spacer member 48C coincides with the central axis 13 of the shaft 12, and the central axis of the virtual cylindrical shape connecting the vertices of the regular polygon forming the outer shape is the central axis 43 of the shaft insertion hole 44. Matches.

  Therefore, the shaft 12 is rotated with respect to the club head 14, and the fitting portion 48 a of the spacer member 48 B is circumferentially arranged with respect to one corner or side portion of the regular polygon of the non-circular portion 44 a of the shaft insertion hole 44. By shifting the angle, the lie angle, loft angle (face angle), or both can be adjusted in accordance with the characteristics of the golfer. When the regular polygonal shape is, for example, a square, a total of four patterns of increase / decrease in loft angle and increase / decrease in lie angle are adjustable. In addition, when the regular polygonal shape is, for example, a regular octagon, in addition to the four patterns for individually adjusting the loft angle and the lie angle, there are four patterns that combine the increase and decrease of both the loft angle and the lie angle. Adjustments are possible, and thus a total of eight patterns can be adjusted. Even when the regular polygon is a regular hexagon, adjustment can be made according to the angle.

  The positions where these central axes 13 and 43 intersect can be set as appropriate, but by providing them close to one of the crown part 26 and the sole part 32, the angle formed by these central axes 13 and 43 is set. It can be adjusted effectively. These central axes 13 and 43 are preferably crossed at an angle of about 0.5 to 3.0 °, for example.

  As mentioned above, although various embodiment of this invention has been described, this invention is not limited to any embodiment, It is possible to combine each embodiment variously. For example, the fastening tube portion 42 of the fifth and sixth embodiments uses the fastening tube portion 42A formed by another member shown in the fourth embodiment, or the spacer member 48A shown in the third embodiment. It is also possible to combine the tapered outer shapes.

1 shows a fastening portion between a club head and a shaft of a golf club according to a preferred embodiment of the present invention, wherein (A) is a longitudinal view of the club head, and (B) is a cross-sectional view taken along line BB of (A). . Sectional drawing which follows the II-II line | wire of FIG. FIG. 2 is an exploded view of a fastening portion between the club head and the shaft of FIG. 1. The various urging | biasing members used for the club head removal prevention means are shown, (A) is a top view of a spring washer, (B) is a top view of an elastic body, (C) is along the CC line of (B). Sectional drawing. The 2nd embodiment is shown, (A) is a longitudinal section of the fixed part of a club head and a shaft, and (B) is the exploded view. Sectional drawing of the fixing part of the club head and shaft by 3rd Embodiment. Sectional drawing of the fixing part of the club head and shaft by 4th Embodiment. Sectional drawing similar to FIG. 2 which shows the fixation part of the club head and shaft by 5th Embodiment. The club head by the 6th embodiment and the fixed part of a shaft are shown, (A) is a longitudinal section of a club head, (B) A transverse section.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Golf club head, 12 ... Shaft, 14 ... Golf club head, 18 ... Head main body, 26 ... Crown part, 30 ... Hosel part, 32 ... Sole part, 44 ... Shaft insertion hole, 44a ... Non-circular part, 46 ... Projection (engagement part), 48 ... spacer member, 48 a ... fitting part, 50 ... adhesive layer, 52 ... retaining means.

Claims (5)

  A shaft insertion hole having a non-circular portion with a non-circular cross-sectional shape formed at least in part in a hosel portion that secures the shaft to the head main body and penetrating from the crown portion side to the sole portion side. A spacer member formed on the outer periphery of a non-circular fitting portion that is fixed to the tip end portion of the shaft and fits on the non-circular portion; and a spacer member that protrudes from the inner peripheral portion of the shaft insertion hole. A locking portion that engages with the crown side end of the member to prevent the shaft from being pulled out from the crown side, and is detachably attached to one of the head body and the shaft, and the tip of the shaft is on the sole side A golf club comprising: retaining means for preventing the golf club from being pulled out from the golf club.   The golf club according to claim 1, wherein the spacer member is disposed such that a center line of an inner peripheral portion is inclined with respect to a center line of the outer peripheral portion.   The golf club according to claim 1, wherein the non-circular portion has a regular octagonal cross-sectional shape.   4. The golf club according to claim 2, wherein the center line of the outer peripheral portion and the center line of the inner peripheral portion intersect on the crown portion side.   5. The golf club according to claim 1, wherein a crown portion formed of a fiber reinforced resin plate is attached to the head main body.

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