JP2014195560A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable golf club in which a shaft is detachably attached to a head.SOLUTION: A golf club 2 includes: a head 4; a shaft 6; a sleeve 8; and a screw 10, where the sleeve 8 is fixed to the tip of the shaft 6. The head 4 includes a head body 18 and an engaging member 20. The engaging member 20 is fixed to the head body 18. On the basis of the engagement between the sleeve 8 and the engaging member 20, the rotation of the sleeve 8 is regulated with respect to the head 4. On the basis of the connection between the sleeve 8 and the screw 10, the coming off of the sleeve 8 is regulated with respect to the head 4. The screw 10 is a multi-thread screw.

Description

  The present invention relates to a golf club. Specifically, the present invention relates to a golf club in which a head and a shaft can be attached and detached.

  A golf club in which the head and the shaft can be attached and detached has been proposed. The ability to attach and detach the head and shaft is beneficial for several reasons. If it is possible to attach and detach, the golfer can easily change the head and shaft. For example, it becomes easy for a golfer who is not satisfied with the performance of a purchased golf club to change the head and shaft himself. In addition, the golfer himself can easily assemble an original golf club in which a favorite head and a favorite shaft are combined. Golfers can purchase their favorite heads and favorite shafts and assemble them themselves. In addition, a golf club store can select and sell a combination of a head and a shaft that is appropriate for the golfer. The detachable head and shaft facilitate custom-made golf clubs.

  United States Patent Application US2009 / 0286618 and United States Patent Application US2009 / 0286611 disclose golf clubs with a detachable head and shaft. In these US publications, a configuration in which the shaft hole axis of the sleeve is inclined with respect to the hosel axis is disclosed. This configuration enables adjustment of the loft angle and the like.

  FIGS. 2 and 60 of US Patent Application US2009 / 0286618 disclose a structure using a hosel insert 200. The hosel insert 200 is fixed inside the hosel hole. The hosel insert 200 can prevent the sleeve from rotating.

  JP 2012-86010 A discloses a golf club having an engaging member. The golf club includes a head, a shaft, a sleeve, and a screw, and the sleeve is fixed to a tip portion of the shaft. The head has a head main body and an engaging member. The engaging member is fixed to the head body. Based on the engagement between the sleeve and the engagement member, the rotation of the sleeve relative to the head is restricted. Based on the connection between the sleeve and the screw, the sleeve is prevented from coming off from the head. In this golf club, a transition state between a combined state in which the screw and the sleeve are combined and a separated state in which the screw is removed from the sleeve is possible. The head body has a screw part for coupling the engaging member, and the engaging member has a screw part. The screw portion of the head main body and the screw portion of the engaging member are coupled.

US Patent Application US2009 / 0286618 US Patent Application US2009 / 0286611 JP 2012-86010 A

  When the shaft (sleeve) is not sufficiently fixed, it cannot function as a golf club. A reliable fixation between the shaft and the head leads to the reliability of the club. On the other hand, it is preferable that attachment / detachment work is easy from the viewpoint of convenience.

  An object of the present invention is to provide a golf club that has a shaft detachably attached to a head and is excellent in reliability and convenience.

  The golf club of the present invention includes a head, a shaft, a sleeve, and a screw. The sleeve is fixed to the tip of the shaft. The head has a head main body and an engaging member. The engaging member is fixed to the head body. Based on the engagement between the sleeve and the engagement member, the rotation of the sleeve relative to the head is restricted. The sleeve has a sleeve screw portion. Based on the coupling of the sleeve screw portion and the screw, the sleeve is prevented from coming off from the head. It is possible to move between a combined state in which the screw and the sleeve are combined and a separated state in which the screw is removed from the sleeve. The screw is a multiple thread.

  Preferably, the multi-thread screw is a double thread.

  Preferably, the head body has a screw portion A for coupling the engaging member. Preferably, the engaging member has a threaded portion B. Preferably, the screw part A and the screw part B are coupled.

  Preferably, the golf club further includes an intermediate member. Preferably, the intermediate member has a screw portion that can be coupled to the screw. Preferably, the thread portion of the intermediate member is a multiple thread.

  Preferably, the screw has a first screw portion and a second screw portion having an outer diameter larger than that of the first screw portion. Preferably, the head body has a body screw part. Preferably, in the coupled state, the first threaded portion is coupled to the sleeve threaded portion. Preferably, in the coupled state, the second threaded portion is coupled to the main body threaded portion. Preferably, the first screw portion and the second screw portion are multi-threaded screws. Preferably, the sleeve screw portion and the main body screw portion are multi-threaded screws.

  Preferably, the head main body coupled to the second screw portion is elastically deformed by the axial force of the screw.

  The head body may have a screw portion for coupling the engaging member. The engaging member may have a threaded portion. The screw portion of the head body and the screw portion of the engagement member may be coupled.

  In the coupled state, the engaging member may receive the axial force of the screw.

  In the separated state, the screw may be allowed to be screwed to the intermediate member.

  In the coupled state, the screw may be configured not to be coupled to the intermediate member. In the combined state, the screw may be configured to be screw-coupled to the intermediate member.

  In the process of shifting from the coupled state to the separated state, the screw may be configured to be coupled to the intermediate member by a screw.

  The intermediate member may be in an unfixed state. The non-fixed intermediate member may be configured not to drop off due to gravity. The intermediate member may be in a fixed state.

  There may be a space that allows the intermediate member to move in the axial direction.

  Preferably, in the coupled state, the intermediate member may receive an axial force from the screw.

  A golf club excellent in reliability and convenience can be obtained.

FIG. 1 is a view showing a golf club according to a first embodiment of the present invention. FIG. 2 is an exploded view of FIG. FIG. 3 is a cross-sectional view of FIG. FIG. 3 is a cross-sectional view in the vicinity of the hosel. FIG. 3 shows the combined state. FIG. 4 is an exploded view of FIG. FIG. 4 shows the separated state. FIG. 5 is a side view and a bottom view of the sleeve. FIG. 6 is a perspective view of the sleeve of FIG. FIG. 7 is a cross-sectional view taken along line F7-F7 in FIG. FIG. 8 is a cross-sectional view taken along line F8-F8 in FIG. FIG. 9 is a side view and a bottom view of the engaging member. FIG. 10 is a side view and a bottom view of the washer. FIG. 11 is a side view, a bottom view, and a cross-sectional view of the intermediate member. FIG. 12 is a side view and a plan view of a screw according to the first embodiment. FIG. 13 is a cross-sectional view taken along line F13-F13 in FIG. FIG. 14 is a partially cutaway perspective view of the head. FIG. 15 is a cross-sectional view of a golf club according to the second embodiment. FIG. 16 is a side view showing an example of a double thread. FIG. 17 is a side view showing an example of a single screw. FIG. 18 is a cross-sectional view of a golf club according to the third embodiment. FIG. 19 is a side view and a plan view of a screw according to the third embodiment. FIG. 20 is a cross-sectional view of a golf club according to the fourth embodiment. FIG. 21 is a sectional view of a golf club according to the fifth embodiment. FIG. 22 is a cross-sectional view of a golf club according to the sixth embodiment.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  Unless otherwise specified, “axial direction” in the present application means the axial direction of the hosel hole, and “radial direction” means the radial direction of the hosel hole.

  FIG. 1 shows a golf club 2 according to an embodiment of the present invention. FIG. 1 shows only the vicinity of the head of the golf club 2. FIG. 2 is an exploded view of the golf club 2. FIG. 3 is a cross-sectional view of the golf club 2. FIG. 3 is a sectional view taken along the central axis of the sleeve 8.

  The golf club 2 has a head 4, a shaft 6, a sleeve 8, and a screw 10. A sleeve 8 is fixed to the tip of the shaft 6. A grip (not shown) is attached to the rear end of the shaft 6. A shaft-sleeve assembly 12 is formed by the shaft 6 and the sleeve 8 fixed to each other.

  The golf club 2 further includes an intermediate member 14 and a washer 16. As will be described later, the intermediate member 14 is not fixed to the head body 18.

  The head 4 includes a head body 18 and an engagement member 20. The head main body 18 has a hosel hole 22 for inserting the sleeve 8 and a through hole 24 for inserting the screw 10. The through hole 24 passes through the bottom of the hosel hole 22 and reaches the sole. The head body 18 has a hollow portion.

  As shown in FIG. 3, the head body 18 has a flange 25. In the coupled state, the flange 25 is located on the lower side (sole side) of the sleeve 8. The inner diameter of the flange 25 is larger than the outer diameter d2 of the washer 16.

  The type of the head 4 is not limited. The head 4 of this embodiment is a wood type golf club. The head 4 may be a utility type head, a hybrid type head, an iron type head, a putter head, or the like. Further, the shaft 6 is not limited, and a general-purpose carbon shaft or steel shaft can be used.

  The screw 10 is a screw for fixing the shaft 6 (assembly body 12). The screw 10 is a shaft fixing screw. By tightening the screw 10, the shaft-sleeve assembly 12 is fixed to the head 4. This fixed state is also referred to as a combined state in the present application. The combined state is a state that can be used as a golf club. The shaft-sleeve assembly 12 is detached from the head 4 by loosening the screw 10. Thus, in the head 2, the head 4 and the shaft 6 can be attached to and detached from each other. In other words, the shaft 6 is detachably attached to the head 4. FIG. 4 is a cross-sectional view showing a state where the shaft-sleeve assembly 12 is separated from the head 4. The state in which the shaft-sleeve assembly 12 is removed from the head 4 is also referred to as a separated state in the present application.

  FIG. 5 is a side view and a bottom view of the sleeve 8. The upper side of FIG. 5 is a side view, and the lower side of FIG. 5 is a bottom view. FIG. 6 is a perspective view of the sleeve 8. FIG. 7 is a cross-sectional view taken along line F7-F7 in FIG. FIG. 8 is a cross-sectional view taken along line F8-F8 in FIG.

  The sleeve 8 has an upper portion 26, an intermediate portion 28, and a lower portion 30. A step surface 29 exists at the boundary between the upper portion 26 and the intermediate portion 28. The sleeve 8 has a shaft hole 32 and a screw hole 34. The shaft hole 32 is located inside the upper portion 26 and the intermediate portion 28. The shaft hole 32 opens to one side (upper side). The screw hole 34 opens to the other side (lower side). The screw hole 34 is located inside the lower portion 30. The screw hole 34 is a sleeve screw part. The screw hole 34 is a double thread screw.

  In the combined state, the upper portion 26 is exposed. In the coupled state, the step surface 29 is in contact with the hosel end surface 36 of the head 4. The outer diameter of the lower end of the upper part 26 is substantially equal to the outer diameter of the hosel end face 36 as shown in FIG. In the combined state, the upper portion 26 has a ferrule-like appearance. In the coupled state, the intermediate portion 28 and the lower portion 30 are located inside the hosel hole 22.

  The outer surface of the intermediate portion 28 of the sleeve 8 has a circumferential surface 40 and a recessed surface 42. The recessed surface 42 is a groove. The recessed surface 42 extends along the axial direction of the sleeve 8. The recessed surface 42 extends over the entire length of the intermediate portion 28.

  In the coupled state, the circumferential surface 40 is in contact with the hosel hole 22. The entire circumferential surface 40 is in contact with the hosel hole 22. This contact ensures the holding of the sleeve 8 by the hosel hole 22. On the other hand, in the coupled state, the recessed surface 42 is not in contact with the hosel hole 22. The recessed surface 42 contributes to weight reduction of the sleeve 8.

  An outer surface of the lower portion 30 of the sleeve 8 forms a rotation preventing portion 44. The cross-sectional shape of the rotation preventing portion 44 is non-circular. The rotation preventing unit 44 has a plurality of convex portions t1. The protrusion t1 protrudes outward in the radial direction. The convex parts t1 are arranged at equal intervals in the circumferential direction. In this embodiment, the convex part t1 is arrange | positioned every 30 degrees in the circumferential direction.

  As shown in FIG. 8, the axis h <b> 1 of the shaft hole 32 is inclined with respect to the axis z <b> 1 of the circumferential surface 40 of the sleeve 8. The inclination angle θ1 is the maximum value of the angle formed by the axis h1 and the axis z1. In the coupled state, the axis line z1 is equal to the axis line e1 of the hosel hole 22. The axis h1 of the shaft hole 32 is equal to the axis s1 of the shaft 6.

  FIG. 9 is a side view and a bottom view of the engaging member 20. The engaging member 20 has a tubular shape as a whole. The outer surface of the engaging member 20 has a threaded portion 48 and a non-threaded portion 50. The screw portion 48 is a male screw. The non-screw part 50 is a circumferential surface. The entire outer surface of the engagement member 20 may be a screw portion. The screw portion 48 may be a multi-thread screw. The thread portion 48 may be a double thread. The screw portion 48 is an example of the screw portion B.

  The cross-sectional shape of the inner surface of the engagement member 20 is non-circular. The cross-sectional shape of the inner surface of the engagement member 20 corresponds to the cross-sectional shape of the outer surface of the rotation preventing portion 44 of the sleeve 8. A plurality of recesses r <b> 1 are provided on the inner surface of the engagement member 20. The shape of the concave portion r1 corresponds to the shape of the convex portion t1 described above. The recesses r1 are provided at equal intervals in the circumferential direction. The recesses r1 are provided every 30 ° in the circumferential direction.

  An inner surface of the engaging member 20 forms a rotation preventing portion 51. The rotation preventing unit 51 engages with the rotation preventing unit 44 of the sleeve 8 and prevents the sleeve 8 from rotating.

  FIG. 10 is a side view and a bottom view of the washer 16. The washer 16 is an annular member in which one place in the circumferential direction is interrupted. The washer 16 has a first end 16a and a second end 16b. The first end 16a and the second end 16b have different axial positions. The washer 16 is a spring washer (spring washer).

  FIG. 11 is a side view, a bottom view, and a cross-sectional view of the intermediate member 14. 11 is a side view, the center of FIG. 11 is a bottom view, and the lower side of FIG. 11 is a cross-sectional view. The intermediate member 14 is an annular member. The outer peripheral surface 54 of the intermediate member 14 is a circumferential surface. The inner peripheral surface 56 of the intermediate member 14 is a screw part. The inner peripheral surface 56 is a female screw. This female screw is a multiple thread. That is, the inner peripheral surface 56 of the intermediate member 14 is a multi-thread screw. This multiple thread is a double thread.

  FIG. 12 is a side view and a plan view of the screw 10. The screw 10 has a head portion 58 and a shaft portion 60. The shaft portion 60 has a screw portion 62 and a non-screw portion 64. The non-screw part 64 is located closer to the head part 58 than the screw part 62. The screw part 62 is a multi-threaded screw. The screw part 62 is a double thread. The screw portion 62 is a double thread corresponding to the screw hole 34.

  The head 58 has a recess 66 for a wrench. By using a wrench (dedicated wrench or the like) suitable for the recess 66, the screw 10 can be rotated axially. The sleeve 8 can be attached and detached by this shaft rotation.

  The sleeve 8 is prevented from coming off by screw connection. As shown in FIG. 3, the screw hole 34 of the sleeve 8 is screwed to the screw portion 62 of the screw 10. This screw connection prevents the sleeve 8 from coming off. The axial force resulting from this screw connection is balanced with the pressure between the hosel end surface 36 and the step surface 29. In order to secure this axial force, a gap K1 exists between the tip end of the screw 10 and the bottom surface of the screw hole 34 in the above-mentioned combined state (see FIG. 3).

  FIG. 13 is a cross-sectional view taken along line F13-F13 in FIG. As shown in FIG. 13, the rotation preventing portion 44 of the sleeve 8 and the rotation preventing portion 51 of the engaging member 20 are engaged. By this engagement, rotation of the sleeve 8 with respect to the engagement member 20 is prevented.

  The engaging member 20 is fixed to the head body 18.

  The fixing method of the engaging member 20 is not limited, and welding, adhesion, fitting, screw connection, and combinations thereof are exemplified. In the present embodiment, screw coupling is employed as a method for fixing the engaging member 20. As shown in FIG. 4, the hosel hole 22 is provided with a screw portion 70. The screw portion 70 is a female screw. The screw portion 70 and the screw portion 48 of the engagement member 20 are screw-coupled. The screw part 70 may be a multi-thread screw. The screw part 70 may be a double thread. The screw portion 70 is an example of the screw portion A.

  In the engagement between the engagement member 20 and the sleeve 8, a slight defect is not allowed. Even with a slight backlash, the commercial value of the club is lost. The positioning of the engaging member 20 requires high accuracy. By providing the screw portion 70 in the hosel hole 22 and screwing the screw portion 48 of the engaging member 20 to the screw portion 70, the positioning accuracy of the engaging member 20 is improved. That is, the error in the axial position of the engaging member 20 is small, and the error in the axial direction of the engaging member 20 is also small.

  Preferably, the screw connection between the screw portion 70 of the hosel hole 22 and the screw portion 48 of the engagement member 20 is configured to be tightened by a force applied to the head from the ball at the time of hitting. With this configuration, the screw connection is not loosened due to the hit ball.

  In the fixing of the engaging member 20, welding is employed in addition to the above-described screw connection. That is, screw connection and welding are used in combination. Although not shown in the sectional views of FIGS. 3 and 4, at least a part of the interface between the engaging member 20 and the head main body 18 is welded. This welding may or may not include the portion of the screw connection. The combined use of screw connection and welding ensures the fixing of the engagement member 20. The combined use of screw connection and welding prevents loosening of the screw connection. The combined use of screw connection and welding increases the fixing strength of the engaging member 20 to the head body 18.

  When welding is employed, the type of welding is not limited. Examples of the type of welding include laser welding, arc welding, gas welding, and thermite welding.

  In the present embodiment, the engagement member 20 and the head main body 18 are welded by heating from the hosel outer surface 72. This method is suitable for welding the engaging member 20 located in the back of the hosel hole 22. In this embodiment, laser welding is employed. In this embodiment, the hosel outer surface 72 is irradiated with laser, and the engaging member 20 and the head main body 18 are welded. Further, since laser heating has a local heating range, deformation of the engaging member 20 and the hosel hole 22 can be suppressed. Therefore, high dimensional accuracy of the engagement member 20 and the hosel hole 22 is easily maintained, and the accuracy of the position of the engagement member 20 is also easily maintained.

  Even if a heating mark remains on the hosel outer surface 72 located inside the head, the heating mark cannot be seen in the completed head. Therefore, it is not necessary to repair this heating mark in order to improve the appearance of the head. The fact that no repair is necessary can improve the productivity of the head.

  FIG. 14 is a perspective view of the head 4 with a part of the face cut out. As shown in FIG. 14, laser is applied to the hosel outer surface 72 located inside the head, and the engaging member 20 and the head main body 18 are welded. The head main body 18 is composed of a plurality of members, and the engagement member 20 and the head main body 18 are welded before all of the plurality of members are joined.

  In the engagement between the engagement member 20 and the sleeve 8, a slight defect is not allowed. By making the engaging member 20 separate from the head body 18, the degree of freedom in the method of processing the engaging member 20 is increased. For this reason, the engaging member 20 can be processed with high dimensional accuracy. Therefore, the accuracy of engagement between the engagement member 20 and the sleeve 8 is improved.

  As described above, since the engaging member 20 is separate from the head body 18, the dimensional accuracy of the engaging member 20 is high. Therefore, the lower surface 74 (see FIG. 4) of the engagement member 20 is likely to be perpendicular to the axial direction with high accuracy. Due to the high orientation accuracy of the lower surface 74, the axial force in the coupled state is likely to be evenly distributed in the circumferential direction of the engagement member 20. This uniform dispersion can increase the fixing strength of the engaging member 20.

  In the coupled state, the engagement member 20 receives an axial force from the screw 10. As shown in FIG. 3, the axial force resulting from the screw 10 is transmitted to the engagement member 20 via the intermediate member 14. The engaging member 20 receives the axial force from the screw 10. The engaging member 20 that is securely fixed can withstand the axial force from the screw 10.

  Since the intermediate member 14 is separate from the head body 18, the degree of freedom in the processing method of the intermediate member 14 is increased. For this reason, the intermediate member 14 can be processed with high dimensional accuracy. Due to the combination of the engagement member 20 with high accuracy and the intermediate member 14 with high accuracy, the position and posture of the intermediate member 14 in the coupled state are stabilized with high accuracy. Therefore, in the above combined state, the lower surface 80 (see FIG. 3) of the intermediate member 14 is likely to be perpendicular to the axial direction with high accuracy. Due to the high orientation accuracy of the lower surface 80, the axial force in the coupled state tends to be evenly distributed in the circumferential direction of the engagement member 20. This uniform dispersion can increase the fixing strength of the engaging member 20.

  As described above, since the intermediate member 14 is separate from the head main body 18, the degree of freedom in the processing method of the intermediate member 14 is increased. Therefore, the screw portion provided on the inner peripheral surface 56 of the intermediate member 14 is processed and formed with high accuracy. The accurate screw hole 56 facilitates engagement with the screw 10.

  As described above, FIG. 4 shows a state where the head 4 and the shaft-sleeve assembly 12 are separated (hereinafter also referred to as a separated state). In this separated state, the screw 10 does not fall off the head 4. This prevention of falling off is achieved by the intermediate member 14.

  As shown in FIG. 3, the intermediate member 14 and the screw 10 are not screw-coupled in the coupled state. In the coupled state, the non-threaded portion 64 of the screw 10 is located inside the intermediate member 14. The outer diameter of the non-threaded portion 64 is smaller than the inner diameter d7 (see FIG. 11) of the inner peripheral surface 56 of the intermediate member 14. The inner diameter d7 is measured with reference to the thread tip. In the combined state, the intermediate member 14 does not affect the screw connection between the screw 10 and the sleeve 8. The intermediate member 14 does not interfere with the screw connection between the screw 10 and the sleeve 8.

  On the other hand, as shown in FIG. 4, in the separated state, the intermediate member 14 and the screw 10 are screw-coupled. That is, in the separated state, the screw 10 is allowed to be screwed to the intermediate member 14.

  In the golf club 400 described later, the intermediate member 14 and the screw 206 are screw-coupled in the coupled state. The functions of the intermediate member 14 are various.

  In the process of loosening the screw connection between the sleeve 8 and the screw 10, the screw portion of the intermediate member 14 and the screw portion 62 of the screw 10 can be screw-connected. In the process of loosening the screw connection between the sleeve 8 and the screw 10, the screw connection between the screw portion of the intermediate member 14 and the screw portion 62 occurs naturally (automatically). Even when the screw 10 is completely removed from the sleeve 8, the screw connection between the intermediate member 14 and the screw 10 can be maintained (see FIG. 4). Therefore, the screw 10 is prevented from falling off.

  Thus, the golf club 2 is configured so that the screw 10 cannot be screw-coupled to the intermediate member 14 in the coupled state. Furthermore, the golf club 2 is configured such that the screw 10 is screw-coupled to the intermediate member 14 in the process of shifting from the coupled state to the separated state.

  As shown in FIG. 4, the outer diameter d <b> 1 of the intermediate member 14 is larger than the inner diameter of the flange 25. That is, the intermediate member 14 has an outer dimension that cannot pass through the inside of the flange 25. Therefore, the screw 10 screwed to the intermediate member 14 does not fall off.

  The outer diameter d1 of the intermediate member 14 is larger than the inner diameter d4 (see FIG. 9) defined by the bottom surface of the recess r1 of the engagement member 20.

  4 indicates the axial length between the lower end surface of the engaging member 20 and the upper end surface of the flange 25. This length D is greater than the thickness C of the intermediate member 14. Therefore, a gap exists between the lower end surface of the engaging member 20 and the upper end surface of the flange 25. The axial width K2 of this gap is the difference (D−C).

  In the coupled state, the axial force caused by the screw 10 presses the intermediate member 14 against the lower end surface of the engaging member 20 (see FIG. 3). On the other hand, in the separated state, due to gravity, the intermediate member 14 can come into contact with the upper end surface of the flange 25 (see FIG. 4).

  The intermediate member 14 is not fixed to the head body 18. The intermediate member 14 is in an unfixed state. The intermediate member 14 can move in the axial direction between the engaging member 20 and the flange 25.

  The intermediate member 14 in a non-fixed state (free) easily absorbs dimensional errors. The intermediate member 14 in the non-fixed state facilitates the engagement of the screws when shifting from the coupled state to the separated state. The intermediate member 14 in the non-fixed state facilitates screw connection between the screw 10 and the intermediate member 14. In light of the degree of freedom of movement of the intermediate member 14, the difference (DC) is preferably equal to or greater than 0.2 mm, more preferably equal to or greater than 0.3 mm, and still more preferably equal to or greater than 0.5 mm. From the viewpoint of shortening the hosel hole 22 and making the hosel portion light, the difference (DC) is preferably 1.0 mm or less, and more preferably 0.8 mm or less.

  When the intermediate member 14 can move in the radial direction, the absorbability of dimensional errors can be improved, and the screws can be easily engaged with each other. From this viewpoint, there may be a space that allows the intermediate member 14 to move in the radial direction. That is, from the viewpoint that the intermediate member 14 can move in the radial direction, the outer diameter d1 of the intermediate member 14 is smaller than the inner diameter d5 (see FIG. 4) of the hosel hole 22 at a position where the intermediate member 14 can exist. May be. From the viewpoint of increasing the freedom of movement of the intermediate member 14, the difference (d5-d1) is preferably equal to or greater than 0.1 mm, more preferably equal to or greater than 0.2 mm, and still more preferably equal to or greater than 0.3 mm. When the difference (d5−d1) is excessive, the intermediate member 14 may move excessively, and the engagement between the screws may be deteriorated. In this respect, the difference (d5−d1) is preferably equal to or less than 1.5 mm, and more preferably equal to or less than 1.0 mm. 3 and 4 are depicted such that the inner diameter d5 and the outer diameter d1 are the same.

  In the coupled state, no axial force is acting on the flange 25. The flange 25 functions as a drop-out preventing protrusion. In other words, the head body has a drop prevention protrusion that prevents the intermediate member 14 from falling. The shape of the drop-out preventing protrusion is not limited. The drop-out preventing protrusion is disposed on the lower side (sole side) of the intermediate member 14.

  In FIG. 9, what is indicated by a symbol A is the axial length of the screw portion 48 provided in the engaging member 20. From the viewpoint of the positioning effect of the engaging member 20 and the fixing strength of the engaging member 20, the length A is preferably 1.5 mm or more, more preferably 2 mm or more, and further preferably 3 mm or more. From the viewpoint of suppressing the cost of the step of processing the screw portion 48, the length A is preferably 5 mm or less, more preferably 4.5 mm or less, and still more preferably 4 mm or less.

  In FIG. 9, the reference numeral B indicates the axial length of the engaging member 20. From the viewpoint of increasing the contact area between the engagement member 20 and the sleeve 8 and enhancing the rotation prevention effect, the length B is preferably 5 mm or more, more preferably 6 mm or more, and even more preferably 7 mm or more. From the viewpoint of reducing the engaging member 20 and increasing the degree of freedom in designing the center of gravity of the head 4, the length B is preferably 12 mm or less, more preferably 11 mm or less, and even more preferably 10 mm or less.

  In FIG. 11, the reference numeral C indicates the thickness of the intermediate member 14. In light of suppressing deformation due to the axial force, the thickness C is preferably equal to or greater than 0.8 mm, more preferably equal to or greater than 1 mm, and still more preferably equal to or greater than 1.2 mm. In light of reducing the intermediate member 14 and increasing the degree of freedom in designing the center of gravity of the head 4, the thickness C is preferably 1.8 mm or less, more preferably 1.6 mm or less, and even more preferably 1.4 mm or less.

  A maximum diameter of the screw head 58 is indicated by a symbol d6 in FIG. From the viewpoint of ensuring transmission of the axial force to the engaging member 20, the maximum diameter d <b> 6 is preferably smaller than the inner diameter of the flange 25. In other words, it is preferable that the screw 10 can pass inside the flange 25.

  From the viewpoint of preventing the deformation of the intermediate member 14, the difference (d4-d2) between the inner diameter d4 (see FIG. 9) of the engaging member 20 and the outer diameter d2 (see FIG. 10) of the washer 16 is preferably 0.5 mm or less. 0.3 mm or less is more preferable, and 0.1 mm or less is still more preferable. The difference (d4−d2) may be 0 mm or a negative value.

  The material of the head body is not limited. Examples of preferable materials include metals, CFRP (carbon fiber reinforced plastics), and combinations thereof, and metals are more preferable. Examples of the metal include titanium alloy, stainless steel, aluminum alloy, magnesium alloy, and combinations thereof. The manufacturing method of each member which comprises a head main body is not limited, Forging, casting, press, NC processing, and these combinations are illustrated.

  The material of the shaft is not limited. Examples of the material of the shaft include CFRP (carbon fiber reinforced plastic) and metal. A so-called carbon shaft or steel shaft can be suitably used. Further, the structure of the shaft is not limited.

  The material of the sleeve is not limited. Preferred materials include titanium alloy, stainless steel, aluminum alloy, magnesium alloy and resin. From the viewpoint of strength and lightness, for example, an aluminum alloy and a titanium alloy are more preferable. As the resin, a resin excellent in mechanical strength is preferable, and for example, a resin called engineering plastic or super engineering plastic is preferable.

  The material of the engaging member is not limited. Preferred materials include titanium alloy, stainless steel, aluminum alloy, magnesium alloy and resin. As the resin, a resin excellent in mechanical strength is preferable, and for example, a resin called engineering plastic or super engineering plastic is preferable.

  The material of the screw is not limited. Preferable materials include titanium alloy, stainless steel, aluminum alloy, magnesium alloy, engineering plastic and super engineering plastic.

  FIG. 15 is a cross-sectional view of the golf club 100 according to the second embodiment. This golf club 100 has a head 104, a shaft 6, a sleeve 8, a screw 10, and a washer 16. A sleeve 8 is fixed to the tip of the shaft 6. A grip (not shown) is attached to the rear end of the shaft 6. A shaft-sleeve assembly 12 is formed by the shaft 6 and the sleeve 8 fixed to each other.

  Unlike the golf club 2 described above, the golf club 100 does not have an intermediate member. As shown in FIG. 15, the head body 106 of the head 104 has a flange 108 instead of the intermediate member. A screw hole 110 is provided on the inner peripheral surface of the flange 108. The screw hole 110 is a female screw. The screw hole 110 is a main body screw part. The screw hole 110 is a multi-thread screw. The screw hole 110 is a double thread. The specification of the screw hole 110 is the same as the specification of the screw portion of the inner peripheral surface 56 of the intermediate member 14. The pitch Pt of the screw holes 110 is the same as the pitch Pt of the screw holes 56. The lead Ld of the screw hole 110 is the same as the lead Ld of the screw hole 56. The golf club 100 is the same as the golf club 2 except that the intermediate member 14 is integrated with the head body.

  In the process of screwing the sleeve 8, the screw portion 62 is screwed to the screw hole 110. When the screw 10 further advances toward the coupled state, the screw portion 62 is screwed to the screw hole 110 and the screw hole 34. When the screw 10 further advances toward the coupled state, the screw coupling between the screw hole 110 and the screw portion 62 is released, and the screw coupling portion between the screw hole 34 and the screw portion 62 increases. Finally, in the coupled state, the screw coupling between the screw hole 110 and the screw portion 62 is released, and the screw hole 34 and the screw portion 62 are screw coupled (see FIG. 15). The specification of the screw hole 110 is the same as the specification of the screw hole 34. The pitch Pt of the screw holes 110 is the same as the pitch Pt of the screw holes 34. The lead Ld of the screw hole 110 is the same as the lead Ld of the screw hole 34.

  FIG. 16 is a side view showing an example of a double thread. FIG. 17 is a side view showing an example of a single screw. A normal screw is a single screw. As shown in FIG. 17, in the single thread, the pitch Pt is equal to the lead Ld. On the other hand, as shown in FIG. 16, in the double thread, the lead Ld is equal to twice the pitch Pt. In the multi-thread screw, the lead Ld is equal to an integer multiple of 2 or more of the pitch Pt. The single thread, double thread, and multiple thread are defined in JIS B 0101: 1994.

  Examples of the multi-thread screw include a three-thread screw and a four-thread screw. In the triple screw, the lead Ld is equal to three times the pitch Pt. In the four-thread screw, the lead Ld is equal to four times the pitch Pt.

  In consideration of the balance between the speed of tightening and the ease of loosening, a double thread and a triple thread are preferable, and a double thread is more preferable.

  The pitch Pt is a distance between adjacent screw threads. The pitch Pt is measured in the axial direction of the screw. This pitch Pt is defined in JIS B 0101: 1994.

  The lead Ld is a distance traveled when the screw makes one rotation. This distance is measured in the axial direction of the screw. The lead Ld is defined in JIS B 0101: 1994.

  A multi-thread screw has a larger travel distance per screw rotation than a single-thread screw. Therefore, the multi-thread screw can shorten the time required for fastening the screw connection. Similarly, the multi-thread screw can shorten the time required for releasing the screw connection.

  The multi-thread screw can shorten the time required for mounting and dismounting the shaft. In the above embodiment, when the shaft-sleeve assembly 12 is attached to the head 4, the screw portion 62 of the screw 10 is fastened to the screw hole 34 of the sleeve 8. Since the screw part 62 and the screw hole 34 are double threaded screws, the time required for this screw connection can be shortened. Therefore, the time required for mounting and removing the shaft 6 can be shortened.

  Furthermore, in the first embodiment, the inner peripheral surface 56 (internal thread) of the intermediate member 14 is a double thread. Therefore, the time required for mounting and removing the shaft 6 can be further shortened.

  FIG. 18 is a cross-sectional view of a golf club 200 according to the third embodiment. This golf club 200 has a head 204, a shaft 6, a sleeve 8, a screw 206, and a washer 208. The washer 208 is a spring washer. A sleeve 8 is fixed to the tip of the shaft 6. A grip (not shown) is attached to the rear end of the shaft 6. A shaft-sleeve assembly 12 is formed by the shaft 6 and the sleeve 8 fixed to each other.

  Unlike the golf club 2 described above, the golf club 100 does not have an intermediate member. As shown in FIG. 18, the head main body 210 of the head 204 has a flange 212 instead of the intermediate member. A screw hole 214 is provided on the inner peripheral surface of the flange 212. The screw hole 214 is a female screw. The screw hole 214 is a main body screw part. The screw hole 214 is a multi-thread screw. The screw hole 214 is a double thread. The specification of the screw hole 214 is the same as the specification of the screw portion of the inner peripheral surface 56 of the intermediate member 14. The head main body 210 is the same as the head main body 106 of the second embodiment.

  FIG. 19 is a side view and a plan view of the screw 206. The screw 206 has a head portion 220 and a shaft portion 222. The shaft part 222 includes a first screw part 224, a second screw part 226, a first non-screw part 228, and a second non-screw part 230. The first screw portion 224 is a male screw. The second screw portion 226 is a male screw. The first non-screw portion 228 is located between the first screw portion 224 and the second screw portion 226. The second screw portion 226 is located closer to the head 220 side than the first screw portion 224. The second non-screw part 230 is located between the head part 220 and the second screw part 226.

  The second non-threaded portion 230 helps to reduce the time required to fasten and remove the screw 206. The second non-screw portion 230 contributes to the weight reduction of the screw 206.

  The first screw portion 224 is a multiple thread. The first screw portion 224 is a double thread screw. The first screw portion 224 is a double thread corresponding to the screw hole 34 of the sleeve 8.

  The second screw portion 226 is a multi-thread screw. The second screw part 226 is a double thread. The second screw portion 226 is a double thread corresponding to the screw hole 214 of the flange 212.

  The outer diameter of the second screw portion 226 is larger than the outer diameter of the first screw portion 224. The outer diameter of the male screw is the diameter of a virtual cylinder that is in contact with the top of the male screw.

  The diameter of the valley of the second screw portion 226 is larger than the diameter of the valley of the first screw portion 224. The diameter of the valley of the male screw is the diameter of a virtual cylinder that is in contact with the bottom of the male screw.

  The pitch Pt of the second screw part 226 is the same as the pitch Pt of the first screw part 224. The lead Ld of the second screw portion 226 is the same as the lead Ld of the first screw portion 224.

  The head 220 has a wrench recess 66. By using a wrench (dedicated wrench or the like) suitable for the recess 66, the screw 206 can be pivoted. By this shaft rotation, the sleeve 8 can be attached and detached.

  The sleeve 8 is prevented from coming off by two screw connections. As shown in FIG. 18, the screw hole 34 of the sleeve 8 is screw-coupled to the first screw portion 224 of the screw 206. This screw connection prevents the sleeve 8 from coming off. Further, the screw hole 214 of the head main body 210 is screwed to the second screw portion 226 of the screw 206. This screw connection prevents the sleeve 8 from coming off.

  The inner diameter of the screw hole 214 is larger than the inner diameter of the screw hole 34. The internal diameter of the female screw is the diameter of a virtual cylinder that is in contact with the top of the female screw.

  The diameter of the valley of the screw hole 214 is larger than the diameter of the valley of the screw hole 34. The diameter of the valley of the female screw is the diameter of a virtual cylinder that is in contact with the bottom of the female screw.

  In attaching the assembly 12 in the golf club 200, the first screw portion 224 of the screw 206 passes through the screw hole 214 and is screwed into the screw hole 34. When the screw 206 further advances toward the connected state, the screw connection between the screw hole 214 and the second screw portion 226 is started. When the screw 206 further advances toward the coupled state, the screw coupling portion between the first screw portion 224 and the screw hole 34 increases, and at the same time, the screw coupling portion between the screw hole 214 and the second screw portion 226 also increases. Finally, in the coupled state, screw coupling between the first screw portion 224 and the screw hole 34 is achieved, and screw coupling between the second screw portion 226 and the screw hole 214 is achieved (see FIG. 18). .

  FIG. 20 is a cross-sectional view of a golf club 300 according to the fourth embodiment. This golf club 300 has a head 304, a shaft 6, a sleeve 8, a screw 206 and a washer 208. The head 304 has a head main body 306. The washer 208 is a spring washer. A sleeve 8 is fixed to the tip of the shaft 6. A grip (not shown) is attached to the rear end of the shaft 6. A shaft-sleeve assembly 12 is formed by the shaft 6 and the sleeve 8 fixed to each other.

  The screw used in the golf club 300 is the screw 206 as in the golf club 200 described above.

  In the golf club 200 described above, the engaging member 20 is separate from the head main body 210. On the other hand, in the golf club 300, a portion corresponding to the engaging member 20 is provided in the head main body 306. That is, in this golf club 300, a portion corresponding to the engaging member 20 is integrated with the head body 306. Except for this point, the golf club 300 is the same as the golf club 200 described above.

  FIG. 21 is a cross-sectional view of a golf club 400 according to the fifth embodiment. This golf club 400 has a head 404, a shaft 6, a sleeve 8, an intermediate member 14, a screw 206 and a washer 208. The washer 208 is a spring washer. A sleeve 8 is fixed to the tip of the shaft 6. A grip (not shown) is attached to the rear end of the shaft 6. A shaft-sleeve assembly 12 is formed by the shaft 6 and the sleeve 8 fixed to each other. The head 404 includes a head main body 406 and the engaging member 20.

  The screw used in the golf club 400 is the screw 206 as in the golf club 200 and the golf club 300 described above.

  The intermediate member used in the golf club 400 is the intermediate member 14 as in the golf club 2 described above.

  The engaging member used in the golf club 400 is the engaging member 20 as in the golf club 2 described above.

  There are two differences between the golf club 400 and the golf club 2 described above. The first difference is whether or not the intermediate member 14 is fixed. The second difference is the screw difference.

  Regarding the first difference, the intermediate member 14 is not fixed in the golf club 2. On the other hand, in the golf club 400, the intermediate member 14 is fixed. The intermediate member 14 is fixed by being sandwiched between the head main body 406 and the engaging member 20. In the golf club 400, the aforementioned axial width K2 (see FIG. 4) is zero. The method for fixing the engaging member 20 is the same as that of the golf club 2 described above.

  Regarding the second difference, the screw used for the golf club 2 is the screw 10, whereas the screw used for the golf club 400 is the screw 206. As shown in FIG. 21, in the coupled state, the screw coupling between the first screw portion 224 and the screw hole 34 is achieved, and the screw coupling between the second screw portion 226 and the screw hole 56 is achieved. .

  FIG. 22 is a cross-sectional view of a golf club 500 according to the sixth embodiment. This golf club 500 has a head 504, a shaft 6, a sleeve 8, an intermediate member 14, a screw 506 and a washer 508. The washer 508 is a spring washer. A sleeve 8 is fixed to the tip of the shaft 6. A grip (not shown) is attached to the rear end of the shaft 6. A shaft-sleeve assembly 12 is formed by the shaft 6 and the sleeve 8 fixed to each other. The head 504 includes a head main body 509 and the engaging member 20.

  The intermediate member used in the golf club 500 is the intermediate member 14 as in the golf club 2 described above.

  Similar to the golf club 2 described above, the intermediate member 14 is not fixed. Similar to the golf club 2, the intermediate member 14 moves within a predetermined axial range and does not fall.

  The engaging member used in the golf club 500 is the engaging member 20 as in the golf club 2 described above.

  A screw 506 used in the golf club 500 is similar to the screw 206 described above. The screw 506 also has a head portion and a shaft portion. The shaft portion of the screw 506 includes a first screw portion 510, a second screw portion 512, a first non-screw portion 514, and a second non-screw portion 516. The first screw portion 510 is a male screw. The second screw portion 512 is a male screw. The first non-screw part 514 is located between the first screw part 510 and the second screw part 512. The second screw portion 512 is located closer to the head than the first screw portion 510. The second non-screw part 516 is located between the head and the second screw part 512.

  The head main body 509 has a screw hole 520. The screw hole 520 is provided on the inner peripheral surface of the flange 522. The screw hole 520 is a main body screw part.

  The first screw portion 510 is a multi-thread screw. The first screw portion 510 is a double thread screw. The first screw portion 510 is a double thread corresponding to the screw hole 34 of the sleeve 8.

  The second screw portion 512 is a multi-threaded screw. The second screw portion 512 is a double thread. The second screw part 512 is a double thread corresponding to the screw hole 520.

  The pitch Pt of the second screw portion 512 is the same as the pitch Pt of the first screw portion 510. The lead Ld of the second screw portion 512 is the same as the lead Ld of the first screw portion 510.

  The outer diameter of the second screw portion 512 is larger than the outer diameter of the first screw portion 510. The diameter of the valley of the second screw part 512 is larger than the diameter of the valley of the first screw part 510.

  As shown in FIG. 22, in the coupled state, screw coupling between the first screw portion 510 and the screw hole 34 is achieved, and screw coupling between the second screw portion 512 and the screw hole 520 is achieved. In the coupled state, the axial position of the screw hole 56 of the intermediate member 14 corresponds to the first non-threaded portion 514. In the coupled state, the screw hole 56 is not screw-coupled. This is the same as the golf club 2 described above (see FIG. 3).

  Each of the above embodiments has the following operational effects, for example.

[Golf Club 2 of First Embodiment (see FIG. 3)]
(Effect a) The time required for fastening the screw connection is shortened by the multi-thread screw. Therefore, the shaft 6 can be quickly attached and detached, and convenience is improved.
(Effect b) The intermediate member 14 can prevent the screw 10 from falling off in the separated state.
(Effect c) The intermediate member 14 that is not fixed facilitates the engagement between the screw hole 56 and the screw portion 62.
(Effect d) Since the intermediate member 14 is separate from the head main body 18, the degree of freedom of the processing method of the intermediate member 14 is increased. For this reason, the intermediate member 14 can be processed with high dimensional accuracy.
(Effect e) Since the engaging member 20 is separate from the head main body 18, the degree of freedom in the method of processing the engaging member 20 is increased. For this reason, the engaging member 20 can be processed with high dimensional accuracy.
(Effect f) By the combination of the engagement member 20 with high accuracy and the intermediate member 14 with high accuracy, the position and posture of the intermediate member 14 in the coupled state are stabilized with high accuracy.
(Effect g) The spring washer 16 prevents the screw 10 from loosening.

[Golf Club 100 of Second Embodiment (see FIG. 15)]
(Effect a) The time required for fastening the screw connection is shortened by the multi-thread screw. Therefore, the quickness of attachment and removal of the shaft 6 is increased, and convenience is improved.
(Effect b) The screw hole 110 can prevent the screw 10 from falling off in the separated state.
(Effect e) Since the engaging member 20 is separate from the head main body 18, the degree of freedom in the method of processing the engaging member 20 is increased. For this reason, the engaging member 20 can be processed with high dimensional accuracy.
(Effect g) The spring washer 16 prevents the screw 10 from loosening.
(Effect h) Although not shown in FIG. 15, the flange 108 is deformed by the axial force acting on the screw in the coupled state. That is, by this axial force, the flange 108 (in the vicinity of the screw hole 110) is pulled upward and slightly deformed. This deformation is elastic deformation. Due to the restoring force of the elastic deformation, the screw 10 is not easily loosened.
(Effect i) The looseness of the screw 10 is effectively suppressed by the synergy of the effect g and the effect h.
(Effect J) Since the two screw portions (the screw hole 34 and the screw hole 110) are both multi-threaded, the effect a is further improved.

[Golf Club 200 of Third Embodiment (see FIG. 18)]
(Effect a) The time required for fastening the screw connection is shortened by the multi-thread screw. Therefore, the shaft 6 can be quickly attached and detached, and convenience is improved.
(Effect b) The screw hole 214 can prevent the screw 206 from falling off in the separated state.
(Effect e) Since the engaging member 20 is separate from the head main body 18, the degree of freedom in the method of processing the engaging member 20 is increased. For this reason, the engaging member 20 can be processed with high dimensional accuracy.
(Effect g) The spring washer 208 makes it difficult for the screw 206 to loosen.
(Effect h) Although not shown in FIG. 18, the flange 212 is deformed by the axial force acting on the screw in the coupled state. That is, by this axial force, the flange 212 (near the screw hole 214) is pulled upward and slightly deformed. This deformation is elastic deformation. Due to the restoring force of the elastic deformation, the screw 206 is not easily loosened.
(Effect i) The looseness of the screw 206 is effectively suppressed by the synergy of the effect g and the effect h.
(Effect J) Since the two screw portions (the screw hole 34 and the screw hole 214) are both multi-threaded, the effect a is further improved.

[Golf Club 300 of Fourth Embodiment (see FIG. 20)]
(Effect a) The time required for fastening the screw connection is shortened by the multi-thread screw. Therefore, the shaft 6 can be quickly attached and detached, and convenience is improved.
(Effect b) The screw hole 214 can prevent the screw 206 from falling off in the separated state.
(Effect g) The spring washer 208 makes it difficult for the screw 206 to loosen.
(Effect h) Although not shown in FIG. 20, in the coupled state, the flange 212 is deformed by the axial force acting on the screw. That is, by this axial force, the flange 212 (near the screw hole 214) is pulled upward and slightly deformed. This deformation is elastic deformation. Due to the restoring force of the elastic deformation, the screw 206 is not easily loosened.
(Effect i) The looseness of the screw 206 is effectively suppressed by the synergy of the effect g and the effect h.
(Effect J) Since the two screw portions (the screw hole 34 and the screw hole 214) are both multi-threaded, the effect a is further improved.

[Golf Club 400 of Fifth Embodiment (see FIG. 21)]
(Effect a) The time required for fastening the screw connection is shortened by the multi-thread screw. Therefore, the shaft 6 can be quickly attached and detached, and convenience is improved.
(Effect b) The intermediate member 14 can prevent the screw 506 from falling off in the separated state.
(Effect d) Since the intermediate member 14 is separate from the head main body 509, the degree of freedom in the processing method of the intermediate member 14 is increased. For this reason, the intermediate member 14 can be processed with high dimensional accuracy.
(Effect e) Since the engaging member 20 is separate from the head main body 509, the degree of freedom in the method of processing the engaging member 20 is increased. For this reason, the engaging member 20 can be processed with high dimensional accuracy.
(Effect f) By the combination of the engagement member 20 with high accuracy and the intermediate member 14 with high accuracy, the position and posture of the intermediate member 14 in the coupled state are stabilized with high accuracy.
(Effect g) The spring washer 208 makes it difficult for the screw 206 to loosen.
(Effect J) Since the two screw portions (the screw hole 34 and the screw hole 56) are both multi-threaded, the effect a is further improved.

[Golf Club 500 of Sixth Embodiment (see FIG. 22)]
(Effect a) The time required for fastening the screw connection is shortened by the multi-thread screw. Therefore, the shaft 6 can be quickly attached and detached, and convenience is improved.
(Effect b) The intermediate member 14 can prevent the screw 506 from falling off in the separated state.
(Effect c) The intermediate member 14 that is not fixed facilitates the engagement between the screw hole 56 and the first screw portion 510.
(Effect d) Since the intermediate member 14 is separate from the head main body 509, the degree of freedom in the processing method of the intermediate member 14 is increased. For this reason, the intermediate member 14 can be processed with high dimensional accuracy.
(Effect e) Since the engaging member 20 is separate from the head main body 509, the degree of freedom in the method of processing the engaging member 20 is increased. For this reason, the engaging member 20 can be processed with high dimensional accuracy.
(Effect f) By the combination of the engagement member 20 with high accuracy and the intermediate member 14 with high accuracy, the position and posture of the intermediate member 14 in the coupled state are stabilized with high accuracy.
(Effect g) The spring washer 508 makes it difficult for the screw 506 to loosen.
(Effect h) Although not shown in FIG. 22, the flange 522 is deformed by the axial force acting on the screw in the coupled state. That is, due to this axial force, the flange 522 (near the screw hole 520) is pulled upward and slightly deformed. This deformation is elastic deformation. Due to the restoring force of the elastic deformation, the screw 506 is not easily loosened.
(Effect i) The looseness of the screw 506 is effectively suppressed by the synergy of the effect g and the effect h.
(Effect J) Since all of the three screw portions (the screw hole 34, the screw hole 56, and the screw hole 520) are multi-threaded, the effect a is further improved.

  Multi-threaded screws are easier to loosen than single-threaded screws. The effects g, h and i effectively suppress the ease of loosening of the multi-thread screw.

  In the effect h, the deformation amount of the head main body (or intermediate member) based on the axial force is preferably 0.01 mm or more, and more preferably 0.03 mm or more. This amount of deformation is measured at the position where the displacement is the largest. By increasing the amount of deformation to some extent, the restoring force is increased, and loosening of the screw can be effectively suppressed. If this amount of deformation is excessive, cracks may occur in the head body. From this viewpoint, the amount of deformation is preferably 0.08 mm or less. This adjustment of the amount of deformation is achieved, for example, by adjusting the thickness and width of the flange. The deformation amount can be adjusted by changing the material of the flange.

  The material of the intermediate member 14 can be different from that of the head main body 406. Therefore, for example, in the golf club 400, the intermediate member 14 can be made of a material having moderate elastic deformation. In this case, for example, the Young's modulus of the intermediate member 14 can be made lower than the Young's modulus of the head body 406. In this case, an appropriate restoring force can be obtained, and loosening of the multi-thread screw can be effectively suppressed. From the viewpoint of strength, the material of the intermediate member 14 is preferably a metal and a resin, and more preferably a metal.

  In the golf club 200, the golf club 300, the golf club 400, and the golf club 500, the assembly 12 is fixed in the axial direction by the first screw connection and the second screw connection. For example, in the golf club 200 of the third embodiment (see FIG. 18), the first screw connection is a connection between the screw hole 34 and the first screw portion 224, and the second screw connection is the screw hole 214 and the second screw connection. This is a connection with the screw portion 226. The diameter of the second screw connection is larger than the diameter of the first screw connection. A large diameter increases the rotational moment. Therefore, the second screw connection having a large diameter effectively suppresses loosening of the screw 206.

  The invention described above can be applied to any golf club head.

2, 100, 200, 300, 400, 500 ... Golf club 4, 104, 204, 304, 404, 504 ... Head 6 ... Shaft 8 ... Sleeve 10, 206, 506 ... Screw (Shaft fixing screw)
12 ... Shaft-sleeve assembly 14 ... Intermediate member 16, 208, 508 ... Washer 18, 106, 210, 306, 406, 509 ... Head body 20 ... Engagement member 22 ... -Hosel hole 32 ... Shaft hole 34 ... Screw hole (sleeve screw part)
44... Anti-rotation portion of the sleeve 48... Thread portion of the engaging member (screw portion B)
51... Anti-rotation portion of engagement member 56... Inner peripheral surface (screw portion) of intermediate member
70: Screw part of the head body (screw part A)
72: Hosel outer surface located inside the head 110, 214, 520 ... Main body screw portion (screw portion that can be coupled with a shaft fixing screw)

Claims (6)

It has a head, a shaft, a sleeve and a screw.
The sleeve is fixed to the tip of the shaft;
The head has a head body and an engaging member,
The engagement member is fixed to the head body;
Based on the engagement between the sleeve and the engagement member, the rotation of the sleeve relative to the head is restricted,
The sleeve has a sleeve thread portion,
Based on the coupling of the sleeve screw part and the screw, the sleeve is prevented from coming off from the head,
Mutual transition between a combined state in which the screw and the sleeve are combined and a separated state in which the screw is removed from the sleeve is possible,
A golf club, wherein the screw is a multi-thread.   The golf club according to claim 1, wherein the multiple thread is a double thread. The head body has a threaded portion A for coupling the engaging member,
The engaging member has a threaded portion B;
The golf club according to claim 1, wherein the screw part A and the screw part B are coupled. An intermediate member;
The intermediate member has a screw portion that can be coupled to the screw,
The golf club according to claim 1, wherein the thread portion of the intermediate member is a multi-threaded screw. The screw has a first screw portion and a second screw portion having an outer diameter larger than the first screw portion,
The head body has a body screw part,
In the coupled state, the first threaded portion is coupled to the sleeve threaded portion, and the second threaded portion is coupled to the body threaded portion,
The first screw portion and the second screw portion are multi-threaded screws,
6. The golf club according to claim 1, wherein the sleeve screw portion and the main body screw portion are multi-threaded screws.   The golf club according to claim 6, wherein the head main body coupled to the second screw portion is elastically deformed by an axial force of the screw.

Images